CN110907325A - Cantilever-type-based fabric air permeability tester and measuring method thereof - Google Patents
Cantilever-type-based fabric air permeability tester and measuring method thereof Download PDFInfo
- Publication number
- CN110907325A CN110907325A CN201911089734.0A CN201911089734A CN110907325A CN 110907325 A CN110907325 A CN 110907325A CN 201911089734 A CN201911089734 A CN 201911089734A CN 110907325 A CN110907325 A CN 110907325A
- Authority
- CN
- China
- Prior art keywords
- test
- cantilever
- air permeability
- type
- air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
Abstract
The invention discloses a cantilever-type-based fabric air permeability tester, which comprises a cantilever-type combined test board, a cantilever-type test fixture and a cantilever-type test device, wherein the cantilever-type combined test board comprises a test board and a cantilever-type test fixture fixedly arranged on the test board; the upper test chamber is fixedly arranged on the cantilever type test tool; the lower test chamber is fixedly arranged on the test board and is positioned right below the upper test chamber; the test host comprises an air pumping system and a differential pressure gauge which are respectively connected with the lower test chamber through pipelines, a computer which is in circuit connection with the air pumping system and the differential pressure gauge, and a voltage control device which respectively supplies power for the computer and the air pumping system. The invention also discloses a cantilever-type-based fabric air permeability testing method. The cantilever type fixture can nondestructively test common fabrics with various shapes and sizes without cutting a sample piece. Cantilever type frock simple structure, the height about lead screw slip table module can be adjusted on it, carries out compressing tightly of test piece and prevents leaking gas, ensures the accuracy of test result.
Description
Technical Field
The invention relates to the field of acoustic testing for measuring air permeability of various porous materials, non-woven fabrics and products of automotive upholstery, in particular to a cantilever-type-based fabric air permeability tester and a measurement method thereof.
Background
Along with the improvement of living standard of people, people have higher and higher requirements on the performance of automobiles. In addition to the requirements for power, economy, and safety, the riding comfort of automobiles is beginning to be emphasized. In recent years, studies on Noise, Vibration and Harshness (NVH) performance of automobiles have been receiving widespread attention. The automobile interior acoustic material has an important influence on the NVH performance of the whole automobile. Although the porous material, the non-woven fabric and the products thereof can effectively absorb noise and convert the noise into heat energy to be dissipated, the sound absorption performance of the porous material, the non-woven fabric and the products thereof can be balanced only when the sound absorption performance measurement index is within a certain numerical value range, and the air permeability is an important influence factor of the sound absorption performance of the porous material, the non-woven fabric and the products thereof. Therefore, the air permeability test of porous materials, non-woven fabrics and products thereof is an important work for ensuring the sound absorption performance of automotive upholstery materials.
The air permeability of the fabric refers to the air permeability of the fabric under the condition of pressure difference between two sides of the fabric. I.e. the volume of air per unit area of fabric that flows between the two sides of the fabric per unit time at a specified pressure differential. The invention relates to a method for testing the air permeability of a material, which mainly comprises a differential pressure method and an equal pressure method, wherein the most widely used method is the differential pressure method, the differential pressure method mainly refers to a pressure difference-determining flow-measuring method, and the invention is a device for measuring the air permeability of a fabric based on the differential pressure method.
A general fabric air permeability tester cuts a sample piece, cuts the sample piece with a certain size according to a standard, and measures the flow passing through the two sides of the sample piece so as to calculate the air permeability. This method has the following problems: (1) the method is a destructive test, destroys the form of a sample piece and is not beneficial to multiple sampling and checking; (2) the unnormal cutting of the specimen size will affect the test result.
Described in patent CN201810512070 (published in 2018, 9 and 11 days) is a flow resistance measuring device for negative pressure type porous material and its products, including a test tool and a test host, the test tool includes a test bench with an auxiliary backing plate, a lower test chamber, an upper test chamber assembly, a trapezoidal screw rod sliding table module, and a portal frame, the test host includes an electromagnetic relay, a vacuum pump, a mass flow controller, an AC/DC conversion module, a micro differential pressure transmitter, two laser ranging units, an overload protection unit, and a control unit. The flow resistance instrument has two measurement modes of nondestructive measurement and destructive measurement, but the structure is complex, and a portal frame in a test tool has length limitation, so that nondestructive measurement can not be carried out on a large sample.
In the above-mentioned embodiments of the known solutions, in order to achieve non-destructive measurement of air permeability of automotive interior trim materials, the tooling is modified, but the problems of complicated structure and heavy weight exist.
Disclosure of Invention
The invention aims to solve the problem of destructive testing of air permeability tests of porous materials, polyurethane plastic foams, non-woven fabrics, products of non-woven fabrics and the like of automotive upholsteries, can provide a nondestructive testing tool and a nondestructive testing method for the air permeability test of the automotive upholsteries, and has simple structure.
The purpose of the invention is realized by at least one of the following technical schemes:
a cantilever-based fabric air permeability tester, comprising:
the cantilever type combined test board comprises a test board and a cantilever type test tool fixedly arranged on the test board;
the upper test chamber is fixedly arranged on the cantilever type test tool;
the lower test chamber is fixedly arranged on the test board and is positioned right below the upper test chamber;
the test host comprises an air pumping system and a differential pressure gauge which are respectively connected with the lower test chamber through pipelines, a computer which is in circuit connection with the air pumping system and the differential pressure gauge, and a voltage control device which respectively supplies power for the computer and the air pumping system.
Further, cantilever type test fixture includes:
the cantilever comprises a cross beam and an upright post which are fixed through connecting angle steel, and the upright post is fixed on the test board through a cantilever bottom support;
the screw rod sliding table module is fixedly arranged at the free end of the cross beam;
and the test chamber clamping device is fixed on the screw rod sliding table module and can move up and down.
Further, the air exhaust system comprises an air flow meter, an air filter, a throttle valve and an air blower which are sequentially connected through pipelines, and the input end of the air flow meter is connected with the lower test chamber.
Further, lead screw slip table module includes the lead screw support, rotates to set up lead screw on the lead screw support, with lead screw thread fit's nut slider.
Furthermore, a manual rocking handle is arranged at the top end of the screw rod, and a guide rod in sliding fit with the nut sliding block is further arranged on the screw rod support.
Further, the screw rod support is fixedly arranged at the free end of the cross beam through a sliding table base and a bolt.
Further, the upper test chamber clamping device includes: with support, detachably that lead screw slip table module is connected and sets up clamp about on the support, control the clamp through supporting annular portion and bolt with go up test chamber fixed connection.
A cantilever-based fabric air permeability testing method comprises the following steps:
1) selecting different test apertures according to the type of the test piece, and placing the test apertures between an upper test chamber and a lower test chamber;
2) the blower is connected with a power supply, air is extracted from the atmosphere, impurities are filtered through an air filter, and the flow is regulated through a throttle valve, so that the pressure difference on the two sides of the test piece reaches a certain value;
3) reading the test results of the differential pressure meter and the air flow meter by the computer, and calculating to obtain the air permeability of the test piece;
4) and repeatedly measuring the same test piece at different positions for a plurality of times, and averaging the final results.
Further, in the step 3), for an air flow rate of a certain differential pressure value, the air permeability of the test piece can be calculated by the following formula:
in the formula, qvIs the air flow through the test piece at a certain pressure difference, in dm3Min, A is the test area of the test piece in cm2The constant 167 is a unit scaling factor.
Further, the test piece comprises polyurethane foam, soft and semi-hard porous elastic materials, non-woven fabrics and textiles.
Compared with the prior art, the invention has the following beneficial effects:
the cantilever type fixture can nondestructively test common fabrics with various shapes and sizes without cutting a sample piece.
Cantilever type frock simple structure, the height about lead screw slip table module can be adjusted on it, carries out compressing tightly of test piece and prevents leaking gas, ensures the accuracy of test result.
Drawings
FIG. 1 is a schematic diagram of a cantilever-based fabric air permeability tester according to an embodiment of the present invention;
fig. 2 is a schematic perspective view of a cantilever-type tool assembly testing table according to an embodiment of the present invention;
FIG. 3 is a front view of a cantilever type tooling assembly test bed according to an embodiment of the present invention;
FIG. 4 is a top view of a cantilever tooling assembly test bed according to an embodiment of the present invention;
FIG. 5 is a left side view of a cantilever type tooling assembly testing table according to an embodiment of the present invention;
FIG. 6 is a schematic cross-sectional view of a cantilever aluminum material of an embodiment of the present invention;
FIG. 7 is a schematic view of a cantilever bottom mount structure according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a screw rod sliding table module according to an embodiment of the present invention;
FIG. 9 is a schematic view of a screw slide module support structure according to an embodiment of the present invention;
FIG. 10 is a schematic view of an upper chamber clamping device according to an embodiment of the present invention.
Reference is made to the accompanying drawings in which: 1-cantilever type tool combination test bench, 2-air flow meter, 3-air filter, 4-throttle valve, 5-air blower, 6-voltage control device, 7-computer, 8-differential pressure meter, 101-test bench, 102-lower test chamber, 103-upper test chamber, 104-upper test chamber clamping device, 105-screw rod sliding table module, 106-sliding table base, 107-cross beam, 108-connecting angle steel, 109-upright post, 110-cantilever bottom support.
Detailed Description
For a better understanding of the present invention, embodiments thereof are described in further detail below with reference to the accompanying drawings.
Fig. 1 shows a schematic diagram of a cantilever-based fabric air permeability tester, which includes a testing platform, a cantilever-type testing tool, an upper testing chamber 103, a lower testing chamber 102, and a testing host, wherein the testing platform and the cantilever-type testing tool are combined into a cantilever-type combined testing platform 1, the upper testing chamber 103 is fixedly arranged on the cantilever-type testing tool, and the lower testing chamber 102 is fixedly arranged on the testing platform 101 and is located right below the upper testing chamber 103; the testing host machine is formed by connecting an air flow meter 2, an air filter 3, a throttle valve 4, an air blower 5, a voltage control device 6, a computer 7 and a differential pressure meter 8. The lower test chamber 102 in the cantilever type combined test bench is provided with two interfaces which are respectively connected with a differential pressure gauge 8 and an air flow meter 2, the differential pressure gauge 2 is used for measuring the pressure difference value at two sides of the test piece, and the air flow meter 2 is used for measuring the air flow passing through the test piece in unit time and unit area. The air filter 3 is used for filtering impurities in air, and the throttle valve 4 is used for adjusting the flow of the air, and specifically comprises three adjusting modes of low pass, medium pass and high pass. When the blower 5 is powered on, air is drawn from the air and flows through the throttle valve 4, the air cleaner 3, the air flow meter 2 to the lower test chamber 102 in this order through the pipe. The voltage control device 6 is used for regulating voltage and supplying power to a computer and a blower. The computer is used for reading the test data and calculating the air permeability.
Fig. 2 is the cantilever type combined test stand 1, and fig. 3 to 5 are front, top and left views of the cantilever type combined test stand 1. The testing platform 101 is fixed with a lower testing chamber 102 and a cantilever type testing tool, and the cantilever type testing tool specifically comprises an upper testing chamber clamping device 104, a screw rod sliding table module 105, a sliding table base 106, a cross beam 107, a connecting angle 108, an upright column 109 and a cantilever bottom support 110. The upper test chamber clamping device 104 (see fig. 10) is specifically composed of a left clamp, a right clamp and a support, an annular groove is formed in the outer wall of the upper test chamber 103, the annular groove is clamped through the clamps, and two ends of the annular groove are fastened and connected with the supports through nuts. The lead screw sliding table module 105 (see fig. 8) comprises a lead screw bracket, a lead screw rotatably arranged on the lead screw bracket, and a nut sliding block in threaded fit with the lead screw. The top end of the screw rod is provided with a manual rocking handle, and the screw rod bracket is also provided with a guide rod in sliding fit with the nut sliding block. The screw rod bracket is fixedly arranged at the free end of the cross beam 107 through a sliding table base 106 and a bolt (see fig. 9). The sliding table base 106 and the cross beam 107 are fixed through trapezoidal nails, and the whole screw rod sliding table module 105 is fixed at the free end of the cross beam 107 and can be adjusted up and down according to the thickness of a test piece to clamp the test piece. The beam 107 and the upright column 109 are fixed through a connecting angle 108, and the upright column 109 and a cantilever bottom support 110 (see fig. 7) are fixed through a trapezoidal nail to form a cantilever type tool with a simple structure. If necessary, when the height of the screw rod sliding table module 105 cannot meet the requirement, the cross beam 107 can be detached, moved up and down, subjected to coarse height adjustment, and then fixedly connected with the upright column 109.
Fig. 6 is a cross section of the cantilever (the beam and the column) made of industrial aluminum profiles, the outer contour of the cross section is rectangular, and the middle part is plum blossom-shaped. Under the prerequisite of satisfying the load requirement, the aluminium alloy quality is light, can effectively alleviate measuring support weight, is convenient for remove, and the while low price can effectively reduce cost.
Another embodiment of the invention provides a fabric air permeability test method based on the fabric air permeability tester, and the measurement method is used for testing the air permeability of automotive interior trim parts.
A cantilever-based fabric air permeability testing method comprises the following steps:
s1, selecting a test head area suitable for a cotton felt carpet made of denim cotton, placing the test head area between the upper test chamber 103 and the lower test chamber 102, rotating the lead screw sliding table module 105, and continuously pressing down the lead screw sliding table module to the surface of the compressed cotton felt;
s2, the voltage control device 6 provides power for the blower 5, when the blower 5 works, air is extracted from the atmosphere, impurities are filtered by the air filter 3, the flow is adjusted by the throttle valve 4, the pressure difference value at two sides of the cotton felt reaches a certain value, and the pressure difference value at two sides of the cotton felt is read by the pressure difference meter;
s3, after the pressure difference is stable, continuously ventilating for a period of time, reading the test results of the pressure difference meter 8 and the air flow meter 2 by the computer 7, and calculating to obtain the air permeability of the cotton felt carpet;
s4, repeat the measurement 5 times at different locations on the cotton carpet and average the final results.
Further, in step S3, for the air flow rate with a certain differential pressure value, the air permeability of the cotton felt can be calculated by the following formula:
in the formula, qvIs the air flow dm passing through the cotton felt under a certain pressure difference3Min, A is the test area cm of the cotton felt2The constant 167 is a unit scaling factor.
In addition, the test piece may include materials such as polyurethane foam, soft and semi-hard porous elastic materials, non-woven fabrics, and textiles, in addition to the cotton felt.
Although the present invention has been described in detail in the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made in the embodiments of the invention described above, and that any modifications, equivalents, improvements and the like, which are within the spirit and principle of the invention, are intended to be included within the scope of the invention.
Claims (10)
1. A fabric air permeability tester based on cantilever type, its characterized in that includes:
the cantilever type combined test bench (1) comprises a test bench (101) and a cantilever type test tool fixedly arranged on the test bench (101);
an upper test chamber (103) fixedly arranged on the cantilever type test tool;
the lower test chamber (102) is fixedly arranged on the test bench (101) and is positioned right below the upper test chamber (103);
the test host comprises an air extraction system and a differential pressure gauge (8) which are respectively connected with the lower test chamber (102) through pipelines, a computer (7) which is in circuit connection with the air extraction system and the differential pressure gauge (8), and a voltage control device (6) which respectively supplies power for the computer (7) and the air extraction system.
2. The cantilever-based fabric air permeability tester of claim 1, wherein the cantilever-based testing fixture comprises:
the cantilever comprises a cross beam (107) and an upright post (109) which are fixed through a connecting angle steel (108), and the upright post (109) is fixed on the test bench (101) through a cantilever bottom support (110);
the screw rod sliding table module (105) is fixedly arranged at the free end of the cross beam (107);
and the upper test chamber clamping device (104) is fixed on the screw rod sliding table module (105) and can move up and down.
3. The cantilever-based fabric air permeability tester of claim 1, wherein the air extraction system comprises an air flow meter (2), an air filter (3), a throttle valve (4) and a blower (5) which are connected in sequence through a pipeline, and the input end of the air flow meter (2) is connected with the lower test chamber (102).
4. The cantilever-based fabric air permeability tester of claim 2, wherein the lead screw sliding table module (105) comprises a lead screw bracket, a lead screw rotatably arranged on the lead screw bracket, and a nut slider in threaded fit with the lead screw.
5. The cantilever-based fabric air permeability tester according to claim 4, wherein a manual rocking handle is arranged at the top end of the screw rod, and a guide rod in sliding fit with the nut slider is further arranged on the screw rod bracket.
6. The cantilever-based fabric air permeability tester of claim 4, wherein the lead screw bracket is fixedly arranged at the free end of the cross beam (107) through a sliding table base (106) and bolts.
7. The cantilever-based fabric air permeability tester of claim 1, wherein the upper test chamber gripping device (104) comprises: with support, detachably that lead screw slip table module (105) are connected and set up clamp about on the support, about the clamp through supporting annular portion and bolt with go up test chamber (103) fixed connection.
8. A cantilever-based fabric air permeability testing method is characterized by comprising the following steps:
1) selecting different test apertures according to the type of the test piece, and placing the test apertures between an upper test chamber (103) and a lower test chamber (102);
2) the air blower (5) is connected with a power supply, air is extracted from the atmosphere, impurities are filtered by the air filter (3), and the flow is adjusted by the throttle valve (4), so that the pressure difference between two sides of the test piece reaches a certain value;
3) the computer (7) reads the test results of the differential pressure meter (8) and the air flow meter (2), and calculates to obtain the air permeability of the test piece;
4) and repeatedly measuring the same test piece at different positions for a plurality of times, and averaging the final results.
9. The method for testing the air permeability of the fabric according to claim 8, wherein in the step 3), the air permeability of the test piece for a certain air flow rate of the differential pressure value can be calculated by the following formula:
in the formula, qvIs the air flow through the test piece at a certain pressure difference, in dm3Min, A is the test area of the test piece in cm2The constant 167 is a unit scaling factor.
10. The fabric air permeability test method of claim 8, characterized in that: the test piece comprises polyurethane foam plastic, soft and semi-hard porous elastic materials, non-woven fabrics and textiles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911089734.0A CN110907325A (en) | 2019-11-08 | 2019-11-08 | Cantilever-type-based fabric air permeability tester and measuring method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911089734.0A CN110907325A (en) | 2019-11-08 | 2019-11-08 | Cantilever-type-based fabric air permeability tester and measuring method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110907325A true CN110907325A (en) | 2020-03-24 |
Family
ID=69817143
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911089734.0A Pending CN110907325A (en) | 2019-11-08 | 2019-11-08 | Cantilever-type-based fabric air permeability tester and measuring method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110907325A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4407224C1 (en) * | 1994-03-05 | 1995-06-14 | Fraunhofer Ges Forschung | Measurement of fabric dynamic gas permeability |
| JP2007178139A (en) * | 2005-12-27 | 2007-07-12 | Susumu Yoshida | Air permeability tester |
| CN101059415A (en) * | 2007-05-31 | 2007-10-24 | 宁波纺织仪器厂 | Fabric air-permeability tester |
| CN103814285A (en) * | 2011-07-08 | 2014-05-21 | 特克斯特斯特股份公司 | Air permeability apparatus |
| CN104713811A (en) * | 2015-03-31 | 2015-06-17 | 广州标际包装设备有限公司 | Air permeability tester |
| CN108169096A (en) * | 2017-12-28 | 2018-06-15 | 苏州朦井纺织科技有限公司 | A kind of ventilative property detection device of textile |
| CN108519319A (en) * | 2018-05-25 | 2018-09-11 | 华南理工大学 | The flow resistance measuring device and method of a kind of negative-pressure type porous material and its product |
| CN109540759A (en) * | 2018-11-05 | 2019-03-29 | 叶文娣 | A kind of textile permeability detection device |
| CN110346265A (en) * | 2019-08-23 | 2019-10-18 | 温州市大荣纺织仪器有限公司 | A kind of Permeometer |
-
2019
- 2019-11-08 CN CN201911089734.0A patent/CN110907325A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4407224C1 (en) * | 1994-03-05 | 1995-06-14 | Fraunhofer Ges Forschung | Measurement of fabric dynamic gas permeability |
| JP2007178139A (en) * | 2005-12-27 | 2007-07-12 | Susumu Yoshida | Air permeability tester |
| CN101059415A (en) * | 2007-05-31 | 2007-10-24 | 宁波纺织仪器厂 | Fabric air-permeability tester |
| CN103814285A (en) * | 2011-07-08 | 2014-05-21 | 特克斯特斯特股份公司 | Air permeability apparatus |
| CN104713811A (en) * | 2015-03-31 | 2015-06-17 | 广州标际包装设备有限公司 | Air permeability tester |
| CN108169096A (en) * | 2017-12-28 | 2018-06-15 | 苏州朦井纺织科技有限公司 | A kind of ventilative property detection device of textile |
| CN108519319A (en) * | 2018-05-25 | 2018-09-11 | 华南理工大学 | The flow resistance measuring device and method of a kind of negative-pressure type porous material and its product |
| CN109540759A (en) * | 2018-11-05 | 2019-03-29 | 叶文娣 | A kind of textile permeability detection device |
| CN110346265A (en) * | 2019-08-23 | 2019-10-18 | 温州市大荣纺织仪器有限公司 | A kind of Permeometer |
Non-Patent Citations (1)
| Title |
|---|
| 李晓雯 等: "《中华人民共和国国家标准 GB/T 5453-1997 纺织品 织物透气性的测定》", 9 June 1997, 中国标准出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN209986856U (en) | Underground pipeline detection clamp machining tool | |
| CN111024605A (en) | Stepless pressure regulating friction coefficient measuring instrument | |
| CN210089951U (en) | Anchor clamps gas tightness detection device | |
| CN110907325A (en) | Cantilever-type-based fabric air permeability tester and measuring method thereof | |
| CN212871953U (en) | Braided bag tensile strength testing arrangement | |
| CN106441968B (en) | Furniture structure node bending fatigue strength testing device and testing method | |
| CN111595690A (en) | Multifunctional pressure test equipment | |
| CN207858653U (en) | A kind of fixture for vehicle air conditioning outlet detection | |
| CN217179830U (en) | A device for manometer measurement detects | |
| CN211505158U (en) | Stepless pressure regulating friction coefficient measuring instrument | |
| CN216410517U (en) | Side leakage detection device for plastic container production | |
| CN115931682A (en) | Filter material dynamic performance tester and testing method thereof | |
| CN203100716U (en) | A loosening clearance measuring device of an automobile backrest | |
| CN109551207A (en) | Automatic manual transmission production line | |
| CN205520741U (en) | A support for measure lathe main shaft diameter runout | |
| CN108981525A (en) | A kind of measuring system of engine guide vane front and rear edge position | |
| CN206223153U (en) | For the arbitrary shape specimen holder of surface topography scanner | |
| CN212275459U (en) | Stainless steel corrugated pipe toughness testing device | |
| CN212540317U (en) | High-precision rapid nondestructive testing device for surface of mechanical part | |
| CN210374964U (en) | Quality inspection device of high-permeability automobile carriage blanket | |
| CN208653818U (en) | A kind of automobile absorber property test platform | |
| CN216115867U (en) | Size detection device for liquid flow valve body of air conditioner of electric automobile | |
| CN207873603U (en) | A kind of device of riveting electronic throttle dish valve screw | |
| CN220270662U (en) | Steel construction stress detection equipment | |
| CN105333783A (en) | Automobile damper detector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200324 |
|
| RJ01 | Rejection of invention patent application after publication |