CN215931727U - Conical contraction/expansion test system - Google Patents
Conical contraction/expansion test system Download PDFInfo
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- CN215931727U CN215931727U CN202122238574.0U CN202122238574U CN215931727U CN 215931727 U CN215931727 U CN 215931727U CN 202122238574 U CN202122238574 U CN 202122238574U CN 215931727 U CN215931727 U CN 215931727U
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Abstract
A conical contraction/expansion test system relates to the field of mortar or mortar contraction expansion detection, and comprises a base platform; the horizontal foot is arranged on the lower surface of the base platform; the test device comprises a test slot, a horizontal bubble and a pillar fixing base, wherein the test slot is installed on a base platform; the lower end of the strut is fixed on the strut fixing base, and the side wall of the strut is provided with a strip-shaped through hole; the lower end of the screw rod is arranged in the strut fixing base through a bearing; an up-down adjusting button arranged at the upper end part of the screw rod; the two laser displacement sensor fixing frames are oppositely sleeved outside the strut, the strut is fixedly connected with the first laser displacement sensor fixing frame, and the lead screw is matched with the second laser displacement sensor fixing frame through threads; the laser displacement sensor is installed on the first laser displacement sensor fixing frame, and a laser beam emitted by the laser displacement sensor is aligned to the center of the test groove. The utility model has high measurement precision, simple and convenient calculation and measurement process and improves the measurement efficiency.
Description
Technical Field
The utility model relates to the technical field of mortar or mortar contraction and expansion detection, in particular to a conical contraction/expansion test system.
Background
The mortar or mortar is generally prepared by mixing and stirring cement, fine aggregate and water or cement, fine aggregate, lime and water according to a certain ratio as required. Mortar or mortar is used in general building construction, and finished mortar with strength of M5, M7.5, M10 and the like is mostly used in structure construction. After the mortar or mortar is prepared, the mortar or mortar is generally stirred ceaselessly to be in a fluid state all the time, so that the construction is convenient. Once the maintenance is stopped, the drying and shrinkage deformation occur due to water loss, which affects the construction progress and can not ensure the construction quality. Meanwhile, the drying shrinkage deformation is also an important factor for causing cracking after mortar or mortar construction. The research shows that the main factors influencing the drying shrinkage deformation of the mortar or the mortar comprise water-cement ratio, bleeding amount, cement activity, specific surface area, aggregate grain size, environment temperature and humidity and the like.
At present, in the common mortar or mortar natural drying shrinkage value measuring device on the market, a plurality of instruments are used in the measuring process, the measuring and calculating processes are complex, and the measuring precision is not high. Meanwhile, mortar or mortar is placed in the channel, and flows to generate displacement, thereby affecting the measurement accuracy.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a conical shrinkage/expansion test system to solve the problems of complex measurement and calculation processes and low measurement precision of the conventional mortar or mortar natural drying shrinkage value measurement device.
The technical scheme adopted by the utility model for solving the technical problem is as follows:
the conical contraction/expansion test system of the present invention comprises:
a base platform;
the horizontal foot is arranged on the lower surface of the base platform;
the device comprises a test slot, a horizontal bubble and a pillar fixing base, wherein the test slot is installed on a base platform, and a tapered structure is arranged in the test slot;
the lower end of the strut is fixed on the strut fixing base, and the side wall of the strut is provided with a strip-shaped through hole;
the lower end of the screw rod is arranged in the strut fixing base through a bearing;
an up-down adjusting button arranged at the upper end part of the screw rod;
the laser displacement sensor fixing frame I and the laser displacement sensor fixing frame II are sleeved outside the support column oppositely, the support column is fixedly connected with the laser displacement sensor fixing frame I, and the lead screw is matched with the laser displacement sensor fixing frame II through threads;
the laser displacement sensor is installed on the first laser displacement sensor fixing frame, and a laser beam emitted by the laser displacement sensor is aligned to the center of the test slot.
Furthermore, the test groove is arranged into a double-layer structure, namely the inner wall of the test groove and the outer wall of the test groove, and a tapered protective film is arranged on the inner wall of the test groove.
The water outlet and the water inlet are respectively arranged at two sides of the test groove and are communicated with a space between the inner wall of the test groove and the outer wall of the test groove; the water inlet is connected with an external constant-temperature water bath device, and the water outlet is connected with an external water collecting device.
Furthermore, the pillar-fixing base is mounted on the base platform through a pillar-fixing base mounting plate.
Further, the pillar fixing base includes: the device comprises a lower base, a first threaded hole, an upper support, a first gap, a middle mounting hole, a second threaded hole, a second gap and a third gap; the lower base is arranged on the mounting plate of the pillar fixed base; the upper support is arranged on the lower base, the upper support and the lower base are integrally processed and formed, and the upper support and the lower base are both in cylindrical structures; a third gap is arranged at the joint of the upper support and the lower base; the center of the upper support is provided with a middle mounting hole; the upper support is respectively provided with a first gap and a second gap, the first gap is arranged on the inner wall of the upper support, is in a half-opening type and is arranged with an inward opening, and the second gap is in a full-opening type; the upper supports on two sides of the second gap are respectively provided with a first threaded hole and a second threaded hole, the left side of the second gap is provided with two second threaded holes, the right side of the second gap is provided with two first threaded holes, and the two first threaded holes and the two second threaded holes are arranged in a one-to-one correspondence manner; the lower end of the lead screw is arranged in the lower base through a bearing.
Furthermore, an arc-shaped groove of the laser displacement sensor fixing frame is formed in one end of the laser displacement sensor fixing frame; two arc-shaped grooves of the laser displacement sensor fixing frame are arranged at the two end parts of the laser displacement sensor fixing frame, arc-shaped bulges are arranged at the centers of the two arc-shaped grooves of the laser displacement sensor fixing frame, and the end faces of the arc-shaped bulges are provided with internal threads; one end of the laser displacement sensor fixing frame is connected with the two ends of the laser displacement sensor fixing frame through screws, and after connection is completed, a cylindrical through hole is formed at the joint of the first laser displacement sensor fixing frame and the second laser displacement sensor fixing frame; the strut is arranged in a cylindrical through hole formed at the joint of the first laser displacement sensor fixing frame and the second laser displacement sensor fixing frame; the arc-shaped bulge of the second laser displacement sensor fixing frame is arranged in the strip-shaped through hole of the pillar; and the upper end of the lead screw is matched with the arc-shaped bulge of the second laser displacement sensor fixing frame through threads.
Further, the upper and lower adjusting buttons are arranged at the end part of the upper end of the screw rod through a connecting block; the lead screw is driven to rotate around the axis of the lead screw by manually turning the up-down adjusting button, and the laser displacement sensor fixing frame II is driven to move up and down together with the laser displacement sensor fixing frame I and the laser displacement sensor.
Further, still include the test groove base of fixing on the base platform, the test groove is installed on the test groove base.
Further, the testing device also comprises a temperature sensor and a humidity sensor which are arranged on the outer wall of the testing groove; temperature data of the surrounding environment is measured by a temperature sensor, and humidity data of the surrounding environment is measured by a humidity sensor.
Furthermore, still include the host computer, laser displacement sensor, temperature sensor and humidity transducer all link to each other with the host computer. The laser displacement sensor is controlled to work by the upper computer, and the measured values of the temperature sensor and the humidity sensor are collected by the upper computer.
The utility model has the beneficial effects that:
according to the conical contraction/expansion test system, the test groove is designed into the inner conical structure, so that the flowing phenomenon of the tested material (mortar or mortar) due to the self characteristics of the tested material can be prevented, the problem that the thickness of the tested material (mortar or mortar) is inconsistent after hardening is avoided, the measurement precision is improved, the operation process is simplified, the measurement efficiency is improved, and the measurement time is saved.
According to the conical shrinkage/expansion test system, the laser displacement sensor is adopted to measure the height displacement change value of the tested material (mortar or mortar), the natural drying shrinkage value of the tested material (mortar or mortar) can be calculated by utilizing the height displacement change value, the calculation process is simplified, and meanwhile, the laser measurement is adopted to improve the measurement precision, so that the calculation result is more reliable.
Drawings
FIG. 1 is a schematic diagram of the construction of a conical contraction/expansion test system of the present invention.
FIG. 2 is a schematic diagram of the structure of the conical contraction/expansion test system of the present invention.
FIG. 3 is a front view of the conical contraction/expansion test system of the present invention shown in FIG. 2.
FIG. 4 is a left side view of the tapered contraction/expansion test system of the present invention shown in FIG. 3.
FIG. 5 is a top view of the tapered contraction/expansion test system of the present invention shown in FIG. 3.
FIG. 6 is a schematic diagram showing the positional relationship among the upper and lower adjusting knobs, the lead screws, and the pillar-fixing bases.
Fig. 7 is a schematic structural view of the pillar fixing base.
Fig. 8 is a schematic structural view of a second laser displacement sensor fixing frame.
Fig. 9 is a schematic view of a position relationship between the second laser displacement sensor fixing frame and the lead screw.
In the figure, the device comprises a base platform 1, a test groove base 2, a test groove 3, a test groove 4, a water outlet 5, a water inlet 6, a horizontal pin 7, a horizontal bubble 8, a support fixing base 9, a support 10, a first laser displacement sensor fixing frame 11, a laser displacement sensor 12, an upper adjusting button, a lower adjusting button 13, a connecting block 14, a second laser displacement sensor fixing frame 15, a lead screw 16 and a support fixing base mounting plate.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the conical contraction/expansion test system of the present invention mainly comprises: the device comprises a base platform 1, a test slot 3, a horizontal foot 6, a horizontal bubble 7, a support fixing base 8, a support 9, a first laser displacement sensor fixing frame 10, a laser displacement sensor 11, an upper and lower adjusting button 12, a connecting block 13, a second laser displacement sensor fixing frame 14, a lead screw 15 and a support fixing base mounting plate 16.
The quantity of horizontal foot 6 is 4, installs respectively in four angles departments of base platform 1 lower surface. The base platform 1 is adjusted to a horizontal state by adjusting the horizontal feet 6.
The horizontal bubble 7 is arranged in a recess in the upper surface of the base platform 1. Whether the base platform 1 is in a horizontal state or not can be displayed through the horizontal bubble 7.
The test slot 3 is mounted on the upper surface of the base platform 1. The test slots 3 are arranged in a double-layer structure, i.e., an inner test slot wall 300 and an outer test slot wall 301. The inside of the test slot 3 is provided with a tapered structure. The test slot inner wall 300 is provided with a tapered protective membrane.
The post fixing base mounting plate 16 is mounted on the upper surface of the base platform 1.
The column fixing base 8 is mounted on the column fixing base mounting plate 16. As shown in fig. 7, the pillar fixing base 8 mainly includes: a lower base 800, a first screw hole 801, an upper base 802, a first gap 803, a middle mounting hole 804, a second screw hole 805, a second gap 806, and a third gap 807. The lower base 800 is mounted on the post fixed base mounting plate 16. The upper support 802 is installed on the lower base 800, the upper support 802 and the lower base 800 are integrally machined and molded, and the upper support 802 and the lower base 800 are both of cylindrical structures. A third gap 807 is provided at the connection between the upper support 802 and the lower base 800. The upper support 802 is centrally provided with a central mounting hole 804. The upper support 802 is provided with a first gap 803 and a second gap 806, respectively, wherein the first gap 803 is provided on the inner wall of the upper support 802, is half-open and is provided with an inward opening, and the second gap 806 is full-open. Wherein, the upper support 802 on both sides of the second gap 806 is respectively provided with a first threaded hole 801 and a second threaded hole 805, specifically: two second screw holes 805 are provided on the left side of the second gap 806, two first screw holes 801 are provided on the right side of the second gap 806, and the two first screw holes 801 and the two second screw holes 805 are provided in one-to-one correspondence. Screws can be mounted in the first threaded holes 801 and the corresponding second threaded holes 805 for fastening.
As shown in fig. 6, the laser displacement sensor 11 is mounted on the first laser displacement sensor holder 10. The emitting end of the laser displacement sensor 11 is opposite to the center of the test slot 3, and at the moment, the laser beam emitted by the laser displacement sensor 11 just irradiates the center of the inside of the test slot 3. The end part of the first laser displacement sensor fixing frame 10 is provided with an arc-shaped groove of the laser displacement sensor fixing frame.
As shown in fig. 8 and 9, two arc-shaped grooves 141 of the laser displacement sensor fixing frame are formed at the end portions of the two laser displacement sensor fixing frames 14, an arc-shaped protrusion 140 is formed at the center of the two arc-shaped grooves 141 of the laser displacement sensor fixing frame, and the end face of the arc-shaped protrusion 140 is provided with an internal thread.
The end part of the first laser displacement sensor fixing frame 10 is connected with the end part of the second laser displacement sensor fixing frame 14 through screws, and after connection is completed, a cylindrical through hole is formed at the joint of the first laser displacement sensor fixing frame 10 and the second laser displacement sensor fixing frame 14.
The side wall of the pillar 9 is provided with a strip-shaped through hole. The support 9 is arranged in a cylindrical through hole formed at the joint of the first laser displacement sensor fixing frame 10 and the second laser displacement sensor fixing frame 14. The arc-shaped bulge 140 of the second laser displacement sensor fixing frame 14 is arranged in the strip-shaped through hole of the support 9. The lower end of the strut 9 is fixed on the strut fixing base 8.
A lead screw 15 is mounted in the strut 9. The lower end of the screw 15 is mounted in the lower base 800 of the pillar fixing base 8 through a bearing. The upper end of the screw rod 15 is matched with the arc-shaped bulge 140 of the second laser displacement sensor fixing frame 14 through threads. The up-down adjusting knob 12 is installed on the connecting block 13, and the lower end of the connecting block 13 is installed on the upper end of the screw rod 15.
The screw rod 15 is driven to rotate around the axis of the screw rod by manually shaking the up-down adjusting button 12, and meanwhile, the second laser displacement sensor fixing frame 14, the first laser displacement sensor fixing frame 10 and the laser displacement sensor 11 are driven to move up and down.
As shown in fig. 2, 3, 4, and 5, the tapered contraction/expansion test system of the present invention further includes a test slot chassis 2. The test slot base 2 is fixed on the base platform 1, and the test slot 3 is installed on the test slot base 2.
As shown in fig. 2, 3, 4 and 5, the conical contraction/expansion test system of the present invention further includes a water outlet 4 and a water inlet 5. The water outlet 4 and the water inlet 5 are respectively arranged at two sides of the test slot 3, wherein the position of the water outlet 4 is lower than that of the water inlet 5. The water outlet 4 and the water inlet 5 are both communicated with the space between the inner wall 300 of the test slot and the outer wall 301 of the test slot 3. The water inlet 5 is connected with an external constant temperature water bath device, and the water outlet 4 is connected with an external water collecting device such as a water tank. The water circulation constant temperature or cooling effect between the inner wall 300 of the test slot and the outer wall 301 of the test slot is realized through the action of the water inlet 5 and the water outlet 4.
The conical contraction/expansion test system further comprises a temperature sensor and a humidity sensor, and both the temperature sensor and the humidity sensor can be arranged on the outer wall 301 of the test slot 3. Temperature data of the surrounding environment is measured by a temperature sensor, and humidity data of the surrounding environment is measured by a humidity sensor.
The conical contraction/expansion test system further comprises an upper computer, wherein the laser displacement sensor 11, the temperature sensor and the humidity sensor are all connected with the upper computer. The laser displacement sensor 11 is controlled to work by the upper computer, the upper computer is used for collecting the measured values of the temperature sensor and the humidity sensor, the upper computer is internally provided with measuring software (the prior art is adopted), the collected measured values are recorded by the measuring software, the contraction expansion coefficient of the measured material (mortar or mortar) can be directly calculated, the measuring software can be used for directly displaying a measuring curve, and the measuring result can be printed or output by the upper computer.
According to the conical contraction/expansion test system, during testing, a layer of conical protective film is paved on the inner wall 300 of the test slot, and then a tested material (mortar or mortar) is injected into the test slot 3; laying a layer of polypropylene sheet attached with aluminum foil on the surface of the material (mortar or mortar) to be measured as a reflector of the laser displacement sensor 11, and measuring the height of the material (mortar or mortar) to be measured before hardening as H (unit mm); the test slot 3 is arranged right below the laser displacement sensor 11, so that the laser beam emitted by the laser displacement sensor 11 is just focused on the central part of the reflector; finally, the conical shrinkage/expansion test system of the present invention is placed in an environment at a temperature of (20 ± 5) ° c, after 4 hours, the surface of the material to be tested (mortar or mortar) is smoothed, and the material to be tested (mortar or mortar) is placed in an environment at a temperature of (20 ± 2) ° c and a relative humidity of 90% or more, and after 7 days, the material to be tested (mortar or mortar) is hardened, which is used as an initial state of measurement, that is, the measurement value of the laser displacement sensor 11 should be 0. After the material to be tested (mortar or mortar) is hardened, the conical contraction/expansion test system of the utility model is placed in an environment with the temperature of (20 +/-2) DEG C and the relative humidity of (60 +/-5)%, the height displacement change of the surface of the material to be tested (mortar or mortar) is detected by the laser displacement sensor 11 and is uploaded to an upper computer, and then the height displacement change value H of the material to be tested (mortar or mortar) is measured at the t day (7 days, 14 days, 21 days, 28 days, 56 days and 90 days) respectivelyt(unit mm) is the height value after natural drying, namely the height displacement change value H of the tested material (mortar or mortar)tIn mm is equal to the measured value H of the laser displacement sensor 1111(unit mm).
Measuring the height displacement change value of the tested material (mortar or mortar) by the laser displacement sensor 11 and transmitting the height displacement change value to the upper computer, and calculating the natural drying shrinkage value of the tested material (mortar or mortar) by the measuring software in the upper computer
In the formula, HtFor measuring the height-displacement change of the tested material (mortar or mortar) on day t (7 days, 14 days, 21 days, 28 days, 56 days, 90 days), respectively, H11The height value H is a value measured by the laser displacement sensor 11 before hardening of the material (mortar or mortar) to be measured.
When measured, the natural drying shrinkage value epsilonatThe arithmetic mean of the three measurements was taken as the final result. The data measured by the laser displacement sensor 11 is stored in a digitized format in the upper computer.
The cone-shaped contraction/expansion test system has the advantages that the measurable range is +/-2 millimeters, the accuracy of laser measurement in the full range is better than 0.5 micrometer, and the resolution is better than 0.1 micrometer.
In the description of the present invention, it is to be understood that the terms "central", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the scope of the present invention.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, but such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A conical contraction/expansion test system, comprising:
a base platform;
the horizontal foot is arranged on the lower surface of the base platform;
the device comprises a test slot, a horizontal bubble and a pillar fixing base, wherein the test slot is installed on a base platform, and a tapered structure is arranged in the test slot;
the lower end of the strut is fixed on the strut fixing base, and the side wall of the strut is provided with a strip-shaped through hole;
the lower end of the screw rod is arranged in the strut fixing base through a bearing;
an up-down adjusting button arranged at the upper end part of the screw rod;
the laser displacement sensor fixing frame I and the laser displacement sensor fixing frame II are sleeved outside the support column oppositely, the support column is fixedly connected with the laser displacement sensor fixing frame I, and the lead screw is matched with the laser displacement sensor fixing frame II through threads;
the laser displacement sensor is installed on the first laser displacement sensor fixing frame, and a laser beam emitted by the laser displacement sensor is aligned to the center of the test slot.
2. The tapered shrink/swell test system according to claim 1, wherein the test slots are arranged in a double layer configuration, an inner test slot wall and an outer test slot wall, the inner test slot wall having a tapered protective membrane disposed thereon.
3. The tapered contraction/expansion test system according to claim 2, further comprising a water outlet and a water inlet respectively mounted on both sides of the test slot, the water outlet and the water inlet both communicating with a space between the inner wall of the test slot and the outer wall of the test slot; the water inlet is connected with an external constant-temperature water bath device, and the water outlet is connected with an external water collecting device.
4. The tapered contraction/expansion test system according to claim 1, wherein the strut mount base is mounted on the base platform by a strut mount base mounting plate.
5. The tapered contraction/expansion test system according to claim 4, wherein the strut mount base comprises: the device comprises a lower base, a first threaded hole, an upper support, a first gap, a middle mounting hole, a second threaded hole, a second gap and a third gap; the lower base is arranged on the mounting plate of the pillar fixed base; the upper support is arranged on the lower base, the upper support and the lower base are integrally processed and formed, and the upper support and the lower base are both in cylindrical structures; a third gap is arranged at the joint of the upper support and the lower base; the center of the upper support is provided with a middle mounting hole; the upper support is respectively provided with a first gap and a second gap, the first gap is arranged on the inner wall of the upper support, is in a half-opening type and is arranged with an inward opening, and the second gap is in a full-opening type; the upper supports on two sides of the second gap are respectively provided with a first threaded hole and a second threaded hole, the left side of the second gap is provided with two second threaded holes, the right side of the second gap is provided with two first threaded holes, and the two first threaded holes and the two second threaded holes are arranged in a one-to-one correspondence manner; the lower end of the lead screw is arranged in the lower base through a bearing.
6. The conical contraction/expansion test system according to claim 1, wherein an arc-shaped groove of the laser displacement sensor holder is formed at one end of the laser displacement sensor holder; two arc-shaped grooves of the laser displacement sensor fixing frame are arranged at the two end parts of the laser displacement sensor fixing frame, arc-shaped bulges are arranged at the centers of the two arc-shaped grooves of the laser displacement sensor fixing frame, and the end faces of the arc-shaped bulges are provided with internal threads; one end of the laser displacement sensor fixing frame is connected with the two ends of the laser displacement sensor fixing frame through screws, and after connection is completed, a cylindrical through hole is formed at the joint of the first laser displacement sensor fixing frame and the second laser displacement sensor fixing frame; the strut is arranged in a cylindrical through hole formed at the joint of the first laser displacement sensor fixing frame and the second laser displacement sensor fixing frame; the arc-shaped bulge of the second laser displacement sensor fixing frame is arranged in the strip-shaped through hole of the pillar; and the upper end of the lead screw is matched with the arc-shaped bulge of the second laser displacement sensor fixing frame through threads.
7. The conical contraction/expansion test system according to claim 1, wherein the up-down adjusting knob is mounted on the upper end of the lead screw through a connecting block; the lead screw is driven to rotate around the axis of the lead screw by manually turning the up-down adjusting button, and the laser displacement sensor fixing frame II is driven to move up and down together with the laser displacement sensor fixing frame I and the laser displacement sensor.
8. The tapered shrink/swell test system of claim 1, further comprising a test slot chassis secured to the base platform, the test slot being mounted on the test slot chassis.
9. The tapered contraction/expansion test system according to claim 1, further comprising a temperature sensor and a humidity sensor both disposed on an outer wall of the test slot; temperature data of the surrounding environment is measured by a temperature sensor, and humidity data of the surrounding environment is measured by a humidity sensor.
10. The conical contraction/expansion test system according to claim 9, further comprising an upper computer, wherein the laser displacement sensor, the temperature sensor and the humidity sensor are all connected with the upper computer, the laser displacement sensor is controlled to work through the upper computer, and the upper computer is used for collecting the measured values of the temperature sensor and the humidity sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122238574.0U CN215931727U (en) | 2021-09-14 | 2021-09-14 | Conical contraction/expansion test system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122238574.0U CN215931727U (en) | 2021-09-14 | 2021-09-14 | Conical contraction/expansion test system |
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| CN215931727U true CN215931727U (en) | 2022-03-01 |
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| CN202122238574.0U Active CN215931727U (en) | 2021-09-14 | 2021-09-14 | Conical contraction/expansion test system |
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2021
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Address after: 130000 room 1401, 14th floor, Zhongguancun innovation center, high tech Zone, Changchun City, Jilin Province Patentee after: Jilin aigrui Technology Co.,Ltd. Address before: Room 501, unit 1, floor 5, building 4, south of Jinhu Road, east of Chaofan street, high tech Industrial Development Zone, Changchun City, Jilin Province, 130000 Patentee before: Jilin aigrui Technology Co.,Ltd. |
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