CN110514374B - Spring elastic coefficient rapid detection equipment - Google Patents
Spring elastic coefficient rapid detection equipment Download PDFInfo
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- CN110514374B CN110514374B CN201910843454.8A CN201910843454A CN110514374B CN 110514374 B CN110514374 B CN 110514374B CN 201910843454 A CN201910843454 A CN 201910843454A CN 110514374 B CN110514374 B CN 110514374B
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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
- G01M13/00—Testing of machine parts
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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
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
Abstract
The invention discloses a rapid detection device for spring elastic coefficient, which comprises a detection box and a detection cavity arranged in the detection box, wherein a fixed rod is fixedly arranged on the rear wall of the detection cavity, a working box is fixedly arranged at the front end of the fixed rod, a working cavity is arranged in the working box, through holes penetrating left and right are formed in the left and right walls of the working cavity, a pressing mechanism is arranged in the working cavity, a sealing mechanism is arranged in the detection cavity, and a spring is placed in the working cavity through the through holes. And the reliability of the product is improved.
Description
Technical Field
The invention relates to the technical field of spring detection, in particular to a device for rapidly detecting the elastic coefficient of a spring.
Background
The spring coefficient of a spring is also called stiffness coefficient, which is the magnitude of the elastic force generated when a unit deformation quantity is described, if the value of the spring coefficient of a certain spring is larger, the force required by the unit deformation of the spring is large, in the production of the spring, the detection of the spring coefficient of the spring produced in the same batch is generally sampling detection, the consistency of the spring coefficients of all the springs is difficult to ensure, if all the springs are detected, the cost is greatly increased by using the existing detection equipment, the efficiency is lower, and the invention is provided for solving the problems.
Disclosure of Invention
The invention aims to provide a device for rapidly detecting the elastic coefficient of a spring, which overcomes the problems.
The invention is realized by the following technical scheme.
The invention discloses a rapid detection device for spring elastic coefficient, which comprises a detection box and a detection cavity arranged in the detection box, wherein a fixed rod is fixedly arranged on the rear wall of the detection cavity, a working box is fixedly arranged at the front end of the fixed rod, the working cavity is arranged in the working box, through holes penetrating left and right are formed in the left and right walls of the working cavity, a pressing mechanism is arranged in the working cavity, a sealing mechanism is arranged in the detection cavity, a spring is placed in the working cavity through the through holes, the through holes are sealed by the sealing mechanism, the pressing mechanism compresses the spring by using certain force, and the elastic coefficient of the spring can be obtained according to the compression distance of the spring;
a turntable is rotatably arranged in the detection cavity, four placing grooves with upward openings are arranged in the turntable, a storage box is placed in each placing groove and is positioned at the lower side of the working box, and a storage cavity with an upward opening is arranged in each storage box;
a push-out mechanism is arranged in the detection cavity, after the spring detection is finished, the through hole is opened by the closing mechanism, the turntable rotates to rotate the storage box corresponding to the elastic coefficient of the spring to the lower left side of the working box, and the push-out mechanism pushes out the spring in the working cavity to enable the spring to fall into the storage cavity, so that the springs with different elastic coefficients are screened;
and a feeding mechanism is arranged in the detection cavity and can feed the spring into the working cavity.
Further, the ejecting mechanism including fixed set up in detect the electronic guide rail of chamber antetheca, the transmission piece is installed to electronic guide rail front side, the fixed connecting block that is equipped with in transmission piece front end, the connecting block accessible the perforating hole gets into in the working chamber, be equipped with in the work box forward the opening and with the breach of working chamber intercommunication, run through about the breach the work box, the connecting block gets into during the working chamber, the transmission piece is followed pass through in the breach.
Further, the feeding mechanism comprises a supporting plate fixedly arranged on the left wall of the detection cavity, a feeding pipe is fixedly arranged on the upper end face of the supporting plate, a feeding cavity is arranged in the feeding pipe, the spring is stored in the feeding cavity, a discharging hole penetrating through the feeding cavity from left to right is arranged in the right wall of the feeding cavity, a moving plate capable of moving from left to right is arranged in the feeding cavity, a first electromagnet is fixedly arranged on the left end face of the connecting block, the spring detected in the working cavity is pushed into the storage cavity when the connecting block passes through the working cavity, the connecting block continues to move leftwards to enable the first electromagnet to abut against the right end face of the feeding pipe, the spring is pushed rightwards by the moving plate, the first electromagnet is electrified to enable the spring to be fixed on the first electromagnet, the connecting block moves rightwards, when the first electromagnet moves into the working cavity, and the first electromagnet is powered off, and the spring is left in the working cavity.
Furthermore, a second electromagnet matched with the first electromagnet for use is fixedly arranged in the front wall of the working cavity.
Furthermore, a rotating motor is fixedly arranged on the upper end face of the supporting plate, a rotating shaft is connected to the upper side of the rotating motor in a power mode, a cam is fixedly arranged on the upper end of the rotating shaft and abuts against the left end face of the moving plate, a support plate is fixedly arranged on the left end face of the feeding pipe, a sliding groove with a downward opening is formed in the support plate, a sliding block is arranged in the sliding groove in a sliding mode and is fixedly connected with the moving plate, and a jacking spring is connected between the sliding block and the right wall of the sliding groove.
Furthermore, the closing mechanism includes that bilateral symmetry is rotatable set up in the rotation axis of detection chamber rear wall, the rotation axis is connected on one's body and is equipped with the rotary rod, the fixed closing block that is equipped with of rotary rod one end, the rotation axis is rotatory can make the closing block move to in the perforating hole will the perforating hole is sealed.
Further, a second electric push rod is fixedly arranged in the top wall of the detection cavity, a transmission plate is fixedly arranged at the lower end of the second push rod on the lower side of the second electric push rod, racks are fixedly arranged on the left and right sides of the lower end face of the transmission plate, a gear located on the rear side of the rotary rod is fixedly arranged on the rotary shaft, and the gear is meshed with the racks.
Furthermore, the pushing mechanism comprises a first electric push rod fixedly arranged on the top wall of the working cavity, and a lower pressing block is fixedly arranged at the lower end of the first push rod on the lower side of the first electric push rod.
Further, be equipped with four positioning sensor in the working chamber back wall, after the briquetting pushes down, the positioning sensor detectable the briquetting position down to judge briquetting descending distance down, it is fixed to be equipped with the adjustment motor to detect the chamber diapire, adjustment motor upside power is connected with the power shaft, the power shaft with terminal surface fixed connection under the carousel, the adjustment motor with be equipped with signal transmission between the positioning sensor.
The invention has the beneficial effects that: the spring is compressed by constant force, the elastic coefficient of the spring is judged according to the displacement of the spring, the springs can be detected in batches, the automation degree of the detection process is high, and therefore efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the present invention in operation;
FIG. 3 is a schematic view of the structure at A-A in FIG. 1;
fig. 4 is a schematic view of the structure at B-B in fig. 2.
Detailed Description
The invention will now be described in detail with reference to fig. 1-4, wherein for ease of description the orientations described hereinafter are now defined as follows: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.
The rapid detection device for the spring elastic coefficient described in conjunction with fig. 1-4 mainly includes a detection box 10 and a detection chamber 11 disposed in the detection box 10, a fixing rod 48 is fixedly disposed on the rear wall of the detection chamber 11, a working box 21 is fixedly disposed at the front end of the fixing rod 48, a working chamber 22 is disposed in the working box 21, a through hole 24 penetrating left and right is disposed in the left and right walls of the working chamber 22, a pressing mechanism 93 is disposed in the working chamber 22, a sealing mechanism 90 is disposed in the detection chamber 11, a spring 17 is placed in the working chamber 22 through the through hole 24, the sealing mechanism 90 seals the through hole 24, the pressing mechanism 93 compresses the spring 17 with a certain force, and the elastic coefficient of the spring 17 can be obtained according to the compression distance of the spring 17;
a rotary disc 41 is rotatably arranged in the detection cavity 11, four placing grooves 38 which are opened upwards are arranged in the rotary disc 41, a storage box 36 is arranged in the placing grooves 38, the storage box 36 is positioned at the lower side of the working box 21, and a storage cavity 37 which is opened upwards is arranged in the storage box 36;
a push-out mechanism 91 is arranged in the detection cavity 11, after the detection of the spring 17 is finished, the through hole 24 is opened by the closing mechanism 90, the rotary disc 41 rotates to rotate the storage box 36 corresponding to the elastic coefficient of the spring 17 to the lower left side of the working box 21, the spring 17 in the working cavity 22 is pushed out by the push-out mechanism 91, the spring 17 falls into the storage cavity 37, and the springs 17 with different elastic coefficients are screened;
a feeding mechanism 92 is arranged in the detection cavity 11, and the feeding mechanism 92 can feed the spring 17 into the working cavity 22.
Advantageously, the pushing mechanism 91 includes an electric rail 49 fixedly disposed on the front wall of the detection chamber 11, a transmission block 19 is mounted on the front side of the electric rail 49, a connection block 18 is fixedly disposed on the front end of the transmission block 19, the connection block 18 can enter the working chamber 22 through the through hole 24, a notch 51 which is open forward and is communicated with the working chamber 22 is disposed in the working chamber 21, the notch 51 penetrates the working chamber 21 from left to right, and when the connection block 18 enters the working chamber 22, the transmission block 19 passes through the notch 51.
Advantageously, the feeding mechanism 92 includes a supporting plate 43 fixedly disposed on the left wall of the detection chamber 11, a feeding pipe 15 is fixedly disposed on the upper end surface of the supporting plate 43, a feeding chamber 16 is disposed in the feeding pipe 15, the spring 17 is stored in the feeding chamber 16, a discharging hole 42 penetrating left and right is disposed in the right wall of the feeding chamber 16, a moving plate 47 capable of moving left and right is disposed in the feeding chamber 16, a first electromagnet 20 is fixedly disposed on the left end surface of the connecting block 18, the connecting block 18 pushes the spring 17 detected in the working chamber 22 into the storage chamber 37 when passing through the working chamber 22, the connecting block 18 continues to move left to make the first electromagnet 20 abut against the right end surface of the feeding pipe 15, the moving plate 47 pushes the spring 17 to the right, the first electromagnet 20 is powered to make the spring 17 fixed on the first electromagnet 20, the connecting piece 18 moves to the right, and when the first electromagnet 20 moves into the working chamber 22, the first electromagnet 20 is powered off, leaving the spring 17 in the working chamber 22.
Advantageously, a second electromagnet 50 cooperating with the first electromagnet is fixed in the front wall of the working chamber 22.
Beneficially, a rotating motor 44 is fixedly arranged on the upper end face of the supporting plate 43, a rotating shaft 45 is dynamically connected to the upper side of the rotating motor 44, a cam 46 is fixedly arranged on the upper end of the rotating shaft 45, the cam 46 abuts against the left end face of the moving plate 47, a support plate 52 is fixedly arranged on the left end face of the feeding pipe 15, a sliding groove 13 which is open downwards is arranged in the support plate 52, a sliding block 12 is slidably arranged in the sliding groove 13, the sliding block 12 is fixedly connected with the moving plate 47, and a jacking spring 14 is connected between the sliding block 12 and the right wall of the sliding groove 13.
Advantageously, the closing mechanism 90 includes a rotating shaft 35 rotatably disposed at the rear wall of the detection chamber 11 in a bilateral symmetry, a rotating rod 27 is connected to the rotating shaft 35, a closing block 26 is fixedly disposed at one end of the rotating rod 27, and the rotating shaft 35 rotates to move the closing block 26 to the through hole 24 to close the through hole 24.
Advantageously, a second electric push rod 31 is fixedly arranged in the top wall of the detection cavity 11, a transmission plate 29 is fixedly arranged at the lower end of a second push rod 30 at the lower side of the second electric push rod 31, racks 23 are fixedly arranged on the lower end surface of the transmission plate 29 in a bilaterally symmetrical manner, a gear 28 positioned at the rear side of the rotating rod 27 is fixedly arranged on the rotating shaft 35, and the gear 28 is meshed with the racks 23.
Advantageously, the pressing mechanism 93 comprises a first electric push rod 32 fixedly arranged on the top wall of the working chamber 22, and a pressing block 34 is fixedly arranged at the lower end of a first push rod 33 arranged on the lower side of the first electric push rod 32.
Beneficially, four positioning sensors 25 are arranged in the rear wall of the working chamber 22, after the lower pressing block 34 is pressed down, the positioning sensors 25 can detect the position of the lower pressing block 34, so as to determine the descending distance of the lower pressing block 34, an adjusting motor 40 is fixedly arranged on the bottom wall of the detection chamber 11, a power shaft 39 is dynamically connected to the upper side of the adjusting motor 40, the power shaft 39 is fixedly connected with the lower end face of the rotating disc 41, and signal transmission is arranged between the adjusting motor 40 and the positioning sensors 25.
Sequence of mechanical actions of the whole device:
1. the rotating motor 44 is started to drive the cam 46 to rotate through the rotating shaft 45, the cam 46 pushes the moving plate 47 to move rightwards, and the moving plate 47 pushes one spring 17 in the feeding cavity 16 rightwards to enable the spring 17 to be abutted against the first electromagnet 20;
2. the first electromagnet 20 is electrified to attract the spring 17;
3. when the electric guide rail 49 is started, the transmission block 19 drives the connecting block 18 to move rightwards, and the connecting block 18 drives the first electromagnet 20 to move rightwards;
4. when the first electromagnet 20 moves into the working cavity 22, the first electromagnet 20 is powered off, the second electromagnet 50 is powered on to attract the spring 17, the first electromagnet 20 continues to move rightwards, and the spring 17 is left in the working cavity 22;
5. when the second electric push rod 31 is started, the second push rod 30 drives the transmission plate 29 to ascend, the transmission plate 29 drives the rack 23 to ascend, the gear 28 rotates, the rotating shaft 35 rotates, the rotating rod 27 drives the sealing block 26 to rotate, after the sealing block 26 seals the through hole 24, the second electric push rod 31 is closed, and the second electromagnet 50 is powered off;
6. the first electric push rod 32 is started, the spring 17 is pressed downwards by using constant force, and the larger the elastic coefficient of the spring 17 is, the smaller the downward displacement distance of the lower pressing block 34 is;
7. after the displacement of the lower pressing block 34 is finished, the lower pressing block 34 is in contact with one of the positioning sensors 25, the adjusting motor 40 is started, and the power shaft 39 drives the turntable 41 to rotate, so that the corresponding storage box 36 rotates to the left side of the working box 21;
8. the first electric push rod 32 is started to return the lower pressing block 34 to the initial position, and the second electric push rod 31 is started to return the sealing block 26 to the initial position;
9. the electric guide rail 49 is started to move the first electromagnet 20 to the left, when the first electromagnet 20 moves into the working chamber 22, the spring 17 is pushed into the storage chamber 37, the first electromagnet 20 continues to move to the left and returns to the initial position, and the next detection step of the spring 17 is started.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (1)
1. The utility model provides a spring elastic coefficient short-term test equipment, including the detection case and set up in detection chamber in the detection case, the fixed dead lever that is equipped with of detection chamber back wall, the fixed work box that is equipped with of dead lever front end, be equipped with the working chamber in the work box, its characterized in that: a through hole penetrating left and right is formed in the left wall and the right wall of the working cavity, a pressing mechanism is arranged in the working cavity, a sealing mechanism is arranged in the detection cavity, a spring is placed in the working cavity through the through hole, the sealing mechanism seals the through hole, the pressing mechanism compresses the spring by using a certain force, and the elastic coefficient of the spring can be obtained according to the compression distance of the spring;
a turntable is rotatably arranged in the detection cavity, four placing grooves with upward openings are arranged in the turntable, a storage box is placed in each placing groove and is positioned at the lower side of the working box, and a storage cavity with an upward opening is arranged in each storage box;
a push-out mechanism is arranged in the detection cavity, after the spring detection is finished, the through hole is opened by the closing mechanism, the turntable rotates to rotate the storage box corresponding to the elastic coefficient of the spring to the lower left side of the working box, and the push-out mechanism pushes out the spring in the working cavity to enable the spring to fall into the storage cavity, so that the springs with different elastic coefficients are screened;
a feeding mechanism is arranged in the detection cavity and can feed the spring into the working cavity;
the push-out mechanism comprises an electric guide rail fixedly arranged on the front wall of the detection cavity, a transmission block is arranged on the front side of the electric guide rail, a connecting block is fixedly arranged on the front end of the transmission block, the connecting block can enter the working cavity through the through hole, a notch which is opened forwards and is communicated with the working cavity is arranged in the working box, the notch penetrates through the working box from left to right, and when the connecting block enters the working cavity, the transmission block passes through the notch;
the feeding mechanism comprises a supporting plate fixedly arranged on the left wall of the detection cavity, a feeding pipe is fixedly arranged on the upper end face of the supporting plate, a feeding cavity is arranged in the feeding pipe, the spring is stored in the feeding cavity, a left-right through discharge hole is formed in the right wall of the feeding cavity, a moving plate capable of moving left and right is arranged in the feeding cavity, a first electromagnet is fixedly arranged on the left end face of the connecting block, the detected spring in the working cavity is pushed into the storage cavity when the connecting block penetrates through the working cavity, the connecting block continues to move left to enable the first electromagnet to abut against the right end face of the feeding pipe, the spring is pushed rightwards by the moving plate, the spring is fixed on the first electromagnet when the first electromagnet is electrified, the connecting block moves rightwards, and when the first electromagnet moves into the working cavity, the first electromagnet is powered off, and the spring is left in the working cavity;
a second electromagnet matched with the first electromagnet for use is fixedly arranged in the front wall of the working cavity;
a rotating motor is fixedly arranged on the upper end face of the supporting plate, a rotating shaft is in power connection with the upper side of the rotating motor, a cam is fixedly arranged on the upper end of the rotating shaft, the cam abuts against the left end face of the moving plate, a support plate is fixedly arranged on the left end face of the feeding pipe, a sliding groove with a downward opening is formed in the support plate, a sliding block is arranged in the sliding groove in a sliding mode, the sliding block is fixedly connected with the moving plate, and a jacking spring is connected between the sliding block and the right wall of the sliding groove;
the sealing mechanism comprises a rotating shaft which is bilaterally symmetrical and rotatably arranged on the rear wall of the detection cavity, a rotating rod is connected to the shaft body of the rotating shaft, a sealing block is fixedly arranged at one end of the rotating rod, and the rotating shaft can enable the sealing block to move into the through hole to seal the through hole;
a second electric push rod is fixedly arranged in the top wall of the detection cavity, a transmission plate is fixedly arranged at the lower end of the second push rod at the lower side of the second electric push rod, racks are fixedly arranged on the lower end surface of the transmission plate in a bilateral symmetry manner, a gear positioned at the rear side of the rotary rod is fixedly arranged on the rotary shaft, and the gear is meshed with the racks;
the pressing mechanism comprises a first electric push rod fixedly arranged on the top wall of the working cavity, and a pressing block is fixedly arranged at the lower end of the first push rod at the lower side of the first electric push rod;
be equipped with four positioning sensor in the working chamber back wall, after the briquetting pushes down, the positioning sensor detectable the briquetting position down to judge briquetting descending distance down, it is fixed to be equipped with adjustment motor to detect the chamber diapire, adjustment motor upside power is connected with the power shaft, the power shaft with terminal surface fixed connection under the carousel, adjustment motor with be equipped with signal transmission between the positioning sensor.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910843454.8A CN110514374B (en) | 2019-09-06 | 2019-09-06 | Spring elastic coefficient rapid detection equipment |
| JP2019202752A JP6826254B1 (en) | 2019-09-06 | 2019-11-07 | Equipment that can quickly measure the elastic modulus of a spring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910843454.8A CN110514374B (en) | 2019-09-06 | 2019-09-06 | Spring elastic coefficient rapid detection equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110514374A CN110514374A (en) | 2019-11-29 |
| CN110514374B true CN110514374B (en) | 2020-12-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910843454.8A Active CN110514374B (en) | 2019-09-06 | 2019-09-06 | Spring elastic coefficient rapid detection equipment |
Country Status (2)
| Country | Link |
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| JP (1) | JP6826254B1 (en) |
| CN (1) | CN110514374B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113740011A (en) * | 2021-09-28 | 2021-12-03 | 成都深地领航能源科技有限公司 | Spring measuring device |
| CN116398353A (en) * | 2022-01-14 | 2023-07-07 | 中国长江电力股份有限公司 | Method for verifying stiffness coefficient of yield spring of speed regulator of hydroelectric generating set |
| CN115090552B (en) * | 2022-06-13 | 2023-05-23 | 浙江伊思灵双第弹簧有限公司 | Combined type spring automatic checkout device |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0318740A (en) * | 1989-06-15 | 1991-01-28 | Fujitsu Ltd | Inspection device for coil spring |
| JP2002122490A (en) * | 2000-10-12 | 2002-04-26 | Suncall Corp | Load measuring device for compression spring |
| WO2014091913A1 (en) * | 2012-12-11 | 2014-06-19 | 三菱電機株式会社 | Inspection device and inspection method |
| CN205642828U (en) * | 2016-05-27 | 2016-10-12 | 上海丙嘉精密机械科技有限公司 | Spring pressure measurement |
| CN107436232A (en) * | 2016-05-28 | 2017-12-05 | 深圳市思榕科技有限公司 | The test device of spring mechanical performance |
| CN107436225A (en) * | 2016-05-28 | 2017-12-05 | 深圳市思榕科技有限公司 | Spring fixed seat and the spring test device using the spring fixed seat |
| CN107436228A (en) * | 2016-05-28 | 2017-12-05 | 深圳市思榕科技有限公司 | Spring fixed seat and the spring test device using the spring fixed seat |
| CN107436229A (en) * | 2016-05-28 | 2017-12-05 | 深圳市思榕科技有限公司 | Spring fixed seat and the spring test device using the spring fixed seat |
| CN109916629A (en) * | 2019-03-15 | 2019-06-21 | 北京京城新能源（酒泉）装备有限公司 | A kind of wind turbine power generation machine suspending mechanism coefficient of elasticity quality detection apparatus |
-
2019
- 2019-09-06 CN CN201910843454.8A patent/CN110514374B/en active Active
- 2019-11-07 JP JP2019202752A patent/JP6826254B1/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP6826254B1 (en) | 2021-02-03 |
| JP2021043173A (en) | 2021-03-18 |
| CN110514374A (en) | 2019-11-29 |
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Effective date of registration: 20201130 Address after: 314000 West of Qingyuan Road, Wangdian Town, Xiuzhou District, Jiaxing City, Zhejiang Province (in Wangdian Oriental Electrical Plastics Factory, Xiuzhou District, Jiaxing City) Applicant after: JIAXING CHUANGMEI ELECTRICAL APPLIANCE Co.,Ltd. Address before: Room 304, 208 Changjiang Middle Road, Huangdao District, Qingdao City, Shandong Province Applicant before: Qingdao Keka Stationery Co.,Ltd. |
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