CN111289164A - Foaming material expansibility testing arrangement - Google Patents
Foaming material expansibility testing arrangement Download PDFInfo
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- CN111289164A CN111289164A CN202010146483.1A CN202010146483A CN111289164A CN 111289164 A CN111289164 A CN 111289164A CN 202010146483 A CN202010146483 A CN 202010146483A CN 111289164 A CN111289164 A CN 111289164A
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- reaction
- reaction cylinder
- foaming material
- fixing
- foaming
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides a device for testing expansion force of a foaming material, which comprises: the foaming reaction system comprises a reaction cylinder, a reaction cylinder cover and a fixing frame for pressing the reaction cylinder; the loading system comprises a reaction frame and a lever beam hinged with the reaction frame, wherein one end of the lever beam is provided with a weight tray, the other end of the lever beam is provided with a counterweight, and the lever beam is provided with a force transmission rod; the measuring system comprises a displacement detecting device, a pressure detecting device, a data acquisition instrument and a PC (personal computer); the test bed comprises a support and a table board, and the table board is provided with a limit groove matched with the bottom of the reaction cylinder; the foaming reaction system is arranged on the test bed, the reaction cylinder, the reaction cover and the table top enclose a reaction cavity, the table top is provided with a grouting hole, and a grouting head is arranged in the grouting hole; the loading system is arranged right above the foaming reaction system, and the dowel bar is detachably connected with the reaction cylinder cover. The invention can quickly and accurately measure the expansion force of the foaming material under the action of different constraint loads, thereby improving the engineering repair precision.
Description
Technical Field
The invention relates to the technical field of engineering material mechanical property test, in particular to a foaming material expansion force testing device.
Background
The scale of the national infrastructure is huge, the existing and constructed roads, railways, bridges, dams and other infrastructures are numerous, and various engineering diseases are not generated in short time along with the influence of aging, long-term overhaul and natural factors. In recent years, the non-aqueous reaction foaming polyurethane grouting material has the characteristics of no aqueous reaction, early strength, large expansibility, strong durability and the like, and is widely applied to emergency rescue and repair reinforcement of foundation engineering. In a plurality of engineering diseases, the most common and most harmful diseases are the sinking of the pavement, the airport pavement, the underground pipeline, the canal plate, the high-speed rail pavement plate and the like, and the traditional method is to perform foamed polyurethane grouting lifting on the disease position, but obtain the expansion force parameter of the foamed polyurethane in advance so as to improve the accuracy of the lifting height. However, the existing measuring method is to perform grouting in a closed container, and the expansion force of the foamed polyurethane is measured by installing the soil pressure cell in the upper cover of the reaction container, so that the constraint of upper load is neglected, the actual engineering situation is not met, and the precision of the existing soil pressure cell and the accuracy of the measuring result are both considered.
The prior art discloses a template side pressure testing method (CN104897884B) for grouting filling materials under a dead weight load, and an adopted testing device comprises a test box, a side pressure data acquisition system and a test box deformation measurement bracket, wherein the test box is of a cubic structure with sealed side walls and upper and lower openings, and a lower cover plate is connected to the lower opening of the test box in a sealing manner; the lateral pressure data acquisition system comprises a plurality of pressure sensors, a pressure patrol instrument and a power supply; the test box deformation measurement support comprises a first fixing support and a second fixing support, a horizontal steel wire rope is connected between a first connecting ring on the first fixing support and a second connecting ring on the second fixing support, a plumb line is connected to the horizontal steel wire rope, and a mass block is connected to the bottom of the plumb line. The method provided by the invention can measure the lateral pressure value of the template, but in practical engineering application, the grouting filling material needs to bear unexpected additional load of gravity, and under different loads, the expansion parameters of the grouting filling material are the basis for ensuring accurate repair of the engineering, but the method can not test the expansion parameters of the grouting filling material under different loads.
Therefore, a device capable of rapidly and accurately measuring the expansion force of the foaming material under different constraint loads is needed.
Disclosure of Invention
In order to solve the problems, the invention provides a device for testing the expansion force of a foaming material, which can quickly and accurately measure the expansion force of the foaming material under the action of different constraint loads, thereby improving the precision of engineering repair.
In order to achieve the above object, the present invention provides a device for testing an expansion force of a foaming material, comprising:
the foaming reaction system comprises a reaction cylinder, a reaction cylinder cover which is in sliding sleeve joint with the inner wall of the reaction cylinder, and a fixing frame for pressing the reaction cylinder;
the loading system comprises a reaction frame for fixed support and a lever beam hinged with the reaction frame, wherein one end of the lever beam, which is far away from a hinged joint, is provided with a weight tray, the other end of the lever beam is provided with a counterweight, and the lever beam is provided with a dowel bar;
the measuring system comprises a displacement detection device for detecting the sliding distance of the reaction cylinder cover, a pressure detection device for detecting the expansion force of the foaming material, a data acquisition instrument and a PC (personal computer), wherein the displacement detection device and the pressure detection device are respectively connected with the data acquisition instrument through data lines, and the data acquisition instrument is electrically connected with the PC;
the test bed comprises a support and a table board, and the table board is provided with a limit groove matched with the bottom of the reaction cylinder;
the foaming reaction system is arranged on the test bed, a reaction cavity is defined by the reaction cylinder, the reaction cover and the table board, correspondingly, a grouting hole for injecting foaming materials into the reaction cavity is formed in the position, corresponding to the bottom of the reaction cylinder, on the table board, and a grouting head is arranged in the grouting hole; the loading system is arranged right above the foaming reaction system, and the dowel bar is detachably connected with the reaction cylinder cover.
Preferably, the mount includes solid fixed ring and reaction cylinder set screw, reaction cylinder set screw one end with the mesa is connected, the reaction cylinder set screw other end with gu fixed ring can dismantle the connection, the fixed ring withholds the reaction cylinder up end for the reaction cylinder with mesa fixed connection.
Preferably, the reaction cylinder fixing screw rods are at least two, and the fixing ring is uniformly provided with screw rod holes connected with the reaction cylinder fixing screw rods.
Preferably, the other end of the reaction cylinder fixing screw is detachably connected with the fixing ring through threads.
Preferably, the fixing ring is provided with a pressing groove matched with the upper end face of the reaction cylinder.
Preferably, a sealing ring groove is formed in the side face, in contact with the wall of the reaction cylinder, of the reaction cylinder cover, and a sealing ring is arranged in the sealing ring groove and used for preventing slurry from overflowing.
Preferably, the reaction cylinder cover is provided with an exhaust hole in the thickness direction, and the exhaust hole is provided with an exhaust valve.
Preferably, the thickness of the reaction cylinder cover is 2 cm.
Preferably, the inner diameter of the inner wall of the reaction cylinder is divided into two sections, the inner diameter of the end, contacting the table top, is a first inner diameter, the end, departing from the table top, is a second inner diameter, and the second inner diameter is larger than the first inner diameter, so that a certain space is formed between the cover of the reaction cylinder and the bottom of the reaction cylinder, and the foaming material is prevented from being crystallized due to uneven mixing and affecting the measurement of the expansion force.
Preferably, the reaction frame comprises a reaction beam and two reaction screws, the two reaction screws and the reaction beam are sequentially connected end to form a door-shaped frame, and one ends of the two reaction screws are respectively connected with the table top.
Preferably, the lever beam is hinged with the counter-force beam at an interval of a hinge point, a support lug is arranged on the lever beam, and one end of the dowel bar is connected with the support lug through a spherical hinge.
Preferably, the other end of the dowel bar is detachably connected with the reaction cylinder cover through a thread.
Preferably, the middle part of dowel bar is equipped with displacement detection device response frame.
Preferably, the pressure detection device is arranged on the surface of the reaction cylinder cover, which is contacted with the foaming slurry, so that the expansion force of the foaming material can be detected more accurately.
Preferably, the displacement detection device is arranged on the fixing ring through a fixing support, correspondingly, a fixing support mounting hole is formed in the fixing ring, and a displacement detection device mounting hole is formed in the fixing support.
Preferably, the displacement detection device is a displacement meter, the pressure detection device is a pressure sensor, the precision of the pressure sensor is 0.01MPa, the measuring range is 10MPa, the precision of the displacement meter is 0.01mm, and the measuring range is 150 mm.
Preferably, the slip casting head is the elbow formula, the one end of slip casting head with the detachable connection in slip casting hole, the other end of slip casting head is equipped with control flap, control flap is connected with the slip casting machine.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the device for testing the expansion force of the foaming material, the expansion force of the foaming material can be measured under different fixed constraint effects under a loading system; the real-time measurement of the expansion force and the vertical displacement of the foaming material is realized through the connection of a displacement detection device, a pressure detection device, data acquisition instrument data and a PC; the device is simple to manufacture, convenient to operate, high in precision, low in cost, economical and practical.
2. The loading system of the foaming material expansion force testing device comprises a reaction frame for fixed support and a lever beam hinged with the reaction frame, wherein one end of the lever beam, which is far away from a hinged point, is provided with a weight tray, the other end of the lever beam is provided with a balance weight, and the lever beam is provided with a force transmission rod; the counter-force frame comprises a counter-force cross beam and two counter-force screw rods, the two counter-force screw rods and the counter-force cross beam are sequentially connected end to form a door-shaped frame, so that the loading system disclosed by the invention forms lever principle type loading, the structure assembly is simple, the accuracy of a measurement result is ensured by utilizing the accurate loading of weights, and meanwhile, the testing of the expansion force and the vertical displacement of the foaming material under different fixed loads can be realized according to the loading of different weights.
3. According to the device for testing the expansion force of the foaming material, one end of the dowel bar is in spherical hinge with the lever beam, so that the dowel bar is guaranteed to vertically move, and the other end of the dowel bar is in bolted connection with the reaction cylinder cover through threads, so that the foaming material is conveniently dismounted and cleaned after an experiment is finished, and the device provided by the invention can be reused.
Drawings
In order to more clearly illustrate the embodiments of the present 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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a sectional view of a device for measuring the expansion force of a foam material according to the present invention;
FIG. 2 is a top view of the retaining ring of the present invention;
FIG. 3 is a top view of the test stand of the present invention;
the reference numbers are as follows:
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention will be further described with reference to the following figures:
referring to fig. 1, 2 and 3, the present invention provides a device for testing an expansion force of a foaming material, including:
the foaming reaction system 1 comprises a reaction cylinder 11, a reaction cylinder cover 12 which is in sliding sleeve joint with the inner wall of the reaction cylinder 11, and a fixing frame 13 which is pressed on the reaction cylinder 12;
the loading system 2 comprises a reaction frame 21 for fixed support and a lever beam 22 hinged with the reaction frame 21, wherein one end of the lever beam 22 far away from a hinged point is provided with a weight tray 221, the other end of the lever beam is provided with a counterweight 222, and the lever beam 22 is provided with a force transmission rod 23;
the measuring system 3 comprises a displacement detecting device 31 for detecting the sliding distance of the reaction cylinder cover 12, a pressure detecting device 32 for detecting the expansion force of the foaming material, a data acquisition instrument 33 and a PC (personal computer) 34, wherein the displacement detecting device 31 and the pressure detecting device 32 are respectively connected with the data acquisition instrument 33 through a data line 35, and the data acquisition instrument 33 is electrically connected with the PC 34;
the test bed 4 comprises a support 41 and a table top 42, wherein the table top 42 is provided with a limit groove 421 matched with the bottom of the reaction cylinder 11 and used for limiting the position of the reaction cylinder 11 and preventing the deviation in the test process so as to enable slurry to overflow;
the foaming reaction system 1 is arranged on the test bed 4, the reaction cylinder 11, the reaction cover 12 and the table-board 42 enclose a reaction cavity, correspondingly, a grouting hole 422 for injecting foaming materials into the reaction cavity is arranged on the table-board 42 corresponding to the bottom of the reaction cylinder 11, and a grouting head 5 is arranged in the grouting hole 422; the loading system 2 is arranged right above the foaming reaction system 1, and the dowel bar 23 is detachably connected with the upper end of the reaction cylinder cover 12. The device can realize the measurement of the expansion force of the foaming material under different fixed constraint effects under the loading system 2; the real-time measurement of the expansion force and the vertical displacement of the foaming material is realized by connecting the displacement detection device 31, the pressure detection device 32, the data acquisition instrument 33 and the PC 34; the device is simple to manufacture, convenient to operate, high in precision, low in cost, economical and practical.
It should be noted that the inner wall of the reaction cylinder 11 and the limit groove 421 are sealed by tolerance fit.
As a preferred embodiment, referring to fig. 1, the fixing frame 13 includes a fixing ring 131 and a reaction cylinder fixing screw 132, one end of the reaction cylinder fixing screw 132 is connected to the table 42, the other end of the reaction cylinder fixing screw 132 is detachably connected to the fixing ring 131, and the fixing ring 131 is fastened to the upper end surface of the reaction cylinder 11, so that the reaction cylinder 11 is fixedly connected to the table 42.
In a preferred embodiment, there are at least two reaction tube fixing screws 132, screw holes 1312 uniformly formed in the fixing ring 131 to be connected to the reaction tube fixing screws 132, and four reaction tube fixing screws 132 in this embodiment, and correspondingly, referring to fig. 2, four screw holes 1312 uniformly formed in the fixing ring 131 to be connected to the reaction tube fixing screws 132, and four first connection holes 423 uniformly formed in the table 42 to be connected to the other ends of the reaction tube fixing screws 132.
As a preferred embodiment, referring to FIG. 1, the other end of the reaction cylinder fixing screw 132 is detachably connected to the fixing ring 131 by a screw, and a lock nut is provided thereon.
As a preferred embodiment, the fixing ring 131 is provided with a pressing groove matched with the upper end surface of the reaction cylinder 11, so that the fixing ring 131 is firmly pressed and is not easy to deviate.
In a preferred embodiment, a sealing ring groove is formed on the side surface of the reaction cylinder cover 12 contacting with the cylinder wall of the reaction cylinder 11, and a sealing ring 14 is arranged in the sealing ring groove and used for preventing the slurry from overflowing.
In a preferred embodiment, the reaction cylinder cover 12 is provided with a vent hole in the thickness direction, and the vent hole is provided with a vent valve 15.
As a preferred embodiment, the reaction cylinder cover 12 has a thickness of 2 cm.
As a preferred embodiment, the inner diameter of the inner wall of the reaction cylinder 11 is divided into two sections, the inner diameter of the end contacting with the table-board 42 is a first inner diameter, the end departing from the table-board 42 is a second inner diameter, and the second inner diameter is larger than the first inner diameter, so as to ensure that a certain space is formed between the reaction cylinder cover 12 and the bottom of the reaction cylinder 11, and prevent the foaming material from crystallizing due to uneven mixing and affecting the measurement of the expansion force.
As a preferred embodiment, the reaction frame 21 includes a reaction beam 211 and two reaction screws 212, the two reaction screws 212 and the reaction beam 211 are sequentially connected end to form a door-shaped frame, one end of each of the two reaction screws 212 is connected to the second connection hole 424 on the table top 42, in this embodiment, both ends of the reaction beam 211 are connected to the two reaction screws 212 in a threaded manner, and both ends are respectively provided with a locking nut for fastening, so that the reaction frame 21 can stably support the loading system 2.
As a preferred embodiment, the lever beam 22 is hinged with the reaction beam 211 at a certain distance, the lever beam 22 is provided with a support lug 223, one end of the force transmission rod 23 is hinged with the support lug 223 in a spherical manner, so that the force transmission rod 23 can move vertically, and the other end of the force transmission rod 23 is bolted with the reaction cylinder cover 12 through threads, so that after the experiment is finished, the whole device is conveniently detached, foam materials are conveniently cleaned, and the device provided by the invention can be reused.
As a preferred embodiment, referring to fig. 1, the middle of the dowel bar 23 is provided with a sensing frame 231 of a displacement detection device, so that the test device has a compact structure.
As a preferred embodiment, the pressure detecting device 32 is disposed on the surface of the reaction cylinder cover 12 contacting with the foaming slurry, and directly contacts with the foaming material, so that the detection of the expansion force is more accurate. It should be noted that the data line 35 of the pressure detecting device 32 is led out of the reaction cylinder cover 12 through a sealing rubber plug 36 for preventing slurry from overflowing from the data line hole.
In a preferred embodiment, the displacement detecting device 31 is disposed on the fixing ring 131 through a fixing bracket, and correspondingly, the fixing ring 131 is provided with a fixing bracket mounting hole 1311, and the fixing bracket is provided with a displacement detecting device mounting hole.
In a preferred embodiment, the displacement detecting device 31 is a displacement meter, the pressure detecting device 32 is a pressure sensor, the accuracy of the pressure sensor is 0.01MPa, the measuring range is 10MPa, the accuracy of the displacement meter is 0.01mm, the measuring range is 150mm, and the measurement accuracy of the vertical displacement and the expansion force is ensured.
As a preferred embodiment, the grouting head 5 is an elbow type to buffer grouting pressure, one end of the grouting head 5 is detachably connected with the grouting hole, and the other end of the grouting head 5 is provided with a control valve connected with the grouting machine.
As a preferred embodiment, the weight tray 221, the lever beam 22, the reaction frame 21, the reaction cylinder 11, the reaction cylinder fixing screw 132, the reaction screw 212, the reaction cylinder cover 12, the table top 42 and the grouting head 5 are all made of stainless steel, so that the testing device is prevented from being corroded, and the service life of the device is prolonged.
The operation and use process of the invention is as follows:
and 5, changing the grouting amount and the weight mass, and repeating the steps, so that the relation between the expansion force and the displacement and the constraint load and the foaming material can be obtained, and reference is provided for actual engineering.
The foregoing is a detailed description of the invention, and specific examples are used herein to explain the principles and implementations of the invention, the above description being merely intended to facilitate an understanding of the principles and core concepts of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A foaming material expansibility testing device, characterized by comprising:
the foaming reaction system comprises a reaction cylinder, a reaction cylinder cover which is in sliding sleeve joint with the inner wall of the reaction cylinder, and a fixing frame for pressing the reaction cylinder;
the loading system comprises a reaction frame for fixed support and a lever beam hinged with the reaction frame, wherein one end of the lever beam, which is far away from a hinged joint, is provided with a weight tray, the other end of the lever beam is provided with a counterweight, and the lever beam is provided with a dowel bar;
the measuring system comprises a displacement detection device for detecting the sliding distance of the reaction cylinder cover, a pressure detection device for detecting the expansion force of the foaming material, a data acquisition instrument and a PC (personal computer), wherein the displacement detection device and the pressure detection device are respectively connected with the data acquisition instrument through data lines, and the data acquisition instrument is electrically connected with the PC;
the test bed comprises a support and a table board, and the table board is provided with a limit groove matched with the bottom of the reaction cylinder;
the foaming reaction system is arranged on the test bed, a reaction cavity is defined by the reaction cylinder, the reaction cover and the table board, correspondingly, a grouting hole for injecting foaming materials into the reaction cavity is formed in the position, corresponding to the bottom of the reaction cylinder, on the table board, and a grouting head is arranged in the grouting hole; the loading system is arranged right above the foaming reaction system, and the dowel bar is detachably connected with the reaction cylinder cover.
2. The device for testing the expansive force of the foaming material according to claim 1, wherein the fixing frame comprises a fixing ring and a reaction cylinder fixing screw rod, one end of the reaction cylinder fixing screw rod is connected with the table-board, the other end of the reaction cylinder fixing screw rod is detachably connected with the fixing ring, and the fixing ring is buckled on the upper end face of the reaction cylinder.
3. The device for testing the expansion force of the foaming material according to claim 2, wherein the number of the reaction cylinder fixing screws is at least two, and screw holes connected with the reaction cylinder fixing screws are uniformly formed in the fixing rings.
4. The device for testing the expansive force of the foaming material according to claim 2 or 3, wherein the other end of the reaction cylinder fixing screw is detachably connected with the fixing ring through threads.
5. The device for testing the expansive force of the foaming material according to any one of claims 1 to 3, wherein a sealing ring groove is formed on the side surface of the reaction cylinder cover, which is in contact with the wall of the reaction cylinder, and a sealing ring is arranged in the sealing ring groove.
6. The apparatus for testing expansion force of foaming material according to any one of claims 1-3, wherein the reaction cylinder cover is provided with a vent hole in the thickness direction, and the vent hole is provided with a vent valve.
7. The apparatus for testing expansion force of foaming material according to any one of claims 1 to 3, wherein the inner diameter of the inner wall of the reaction cylinder is divided into two sections, the inner diameter of the end contacting with the table top is a first inner diameter, the end facing away from the table top is a second inner diameter, and the second inner diameter is larger than the first inner diameter.
8. The device for testing the expansion force of the foaming material according to claim 1, wherein the reaction frame comprises a reaction beam and two reaction screws, the two reaction screws and the reaction beam are sequentially connected end to form a door-shaped frame, and one ends of the two reaction screws are respectively connected with the table top.
9. The device for testing the expansion force of the foaming material according to claim 8, wherein the lever beam is hinged with the counter-force beam at intervals, the lever beam is provided with a support lug, and one end of the dowel bar is in spherical hinge with the support lug.
10. The device for testing the expansion force of the foaming material according to claim 2 or 3, wherein the displacement detection device is arranged on the fixing ring through a fixing bracket, correspondingly, a fixing bracket mounting hole is arranged on the fixing ring, and a displacement detection device mounting hole is arranged on the fixing bracket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010146483.1A CN111289164A (en) | 2020-03-05 | 2020-03-05 | Foaming material expansibility testing arrangement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010146483.1A CN111289164A (en) | 2020-03-05 | 2020-03-05 | Foaming material expansibility testing arrangement |
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| CN111289164A true CN111289164A (en) | 2020-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010146483.1A Pending CN111289164A (en) | 2020-03-05 | 2020-03-05 | Foaming material expansibility testing arrangement |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114323934A (en) * | 2021-11-25 | 2022-04-12 | 广东粤海水务投资有限公司 | Expansive force testing system based on contact surface of high polymer and concrete pipeline |
| CN117929193A (en) * | 2024-03-25 | 2024-04-26 | 中国电子科技集团公司第二十九研究所 | Device and method for accurately measuring foaming expansion force of antenna package |
-
2020
- 2020-03-05 CN CN202010146483.1A patent/CN111289164A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114323934A (en) * | 2021-11-25 | 2022-04-12 | 广东粤海水务投资有限公司 | Expansive force testing system based on contact surface of high polymer and concrete pipeline |
| CN117929193A (en) * | 2024-03-25 | 2024-04-26 | 中国电子科技集团公司第二十九研究所 | Device and method for accurately measuring foaming expansion force of antenna package |
| CN117929193B (en) * | 2024-03-25 | 2024-06-07 | 中国电子科技集团公司第二十九研究所 | Device and method for accurately measuring foaming expansion force of antenna package |
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