CN114018728B - Building concrete strength testing arrangement - Google Patents
Building concrete strength testing arrangement Download PDFInfo
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- CN114018728B CN114018728B CN202111317014.2A CN202111317014A CN114018728B CN 114018728 B CN114018728 B CN 114018728B CN 202111317014 A CN202111317014 A CN 202111317014A CN 114018728 B CN114018728 B CN 114018728B
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- 238000012360 testing method Methods 0.000 title claims abstract description 94
- 239000004567 concrete Substances 0.000 title claims abstract description 64
- 230000007246 mechanism Effects 0.000 claims abstract description 31
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims 3
- 230000000694 effects Effects 0.000 claims 1
- 230000008520 organization Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 7
- 238000010276 construction Methods 0.000 description 7
- 230000009471 action Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000002969 artificial stone Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
- G01N3/303—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated only by free-falling weight
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/001—Impulsive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a building concrete strength testing device, which comprises: the test device comprises a base and a bracket arranged at the top of the base, wherein a test mechanism is arranged in the bracket, and clamping mechanisms are arranged at the bottoms of two sides of the bracket; the testing mechanism is used for testing the strength of the building concrete; the clamping mechanism is used for clamping and fixing the concrete sample to be tested; the testing mechanism comprises a mounting seat, and an adjusting assembly is mounted on one side of the mounting seat. According to the invention, through the mutual coordination among the base, the support, the testing mechanism and the clamping mechanism, the device for testing the strength of the building concrete is novel in structure, simple and convenient to operate, and in the testing process, the height and the horizontal position of the concrete sample to be tested are conveniently and correspondingly adjusted according to actual needs, and the concrete sample to be tested is conveniently pressed and fixed, so that the practicability of the testing device is greatly improved.
Description
Technical Field
The invention relates to the technical field of concrete strength testing, in particular to a building concrete strength testing device.
Background
The concrete is an artificial stone which is prepared by taking cement as a main cementing material, mixing with water, sand and stones, doping chemical additives and mineral additives when necessary, mixing according to a proper proportion, uniformly stirring, compacting, forming, curing and hardening, and is a building material which is necessary for a building site, and after the building with the concrete is completed, the strength of a concrete sample block is required to be detected by a concrete strength testing device.
Most of the concrete strength testing devices in the prior art are not convenient to operate, the detection height and the horizontal position are not easy to adjust in the testing process, and the concrete sample to be detected is not convenient to fix, so that the practicability is reduced.
Disclosure of Invention
The invention aims to provide a building concrete strength testing device which is novel in structure, simple and convenient to operate, and in the testing process, the height and the horizontal position of a concrete sample to be detected can be conveniently and correspondingly adjusted according to actual needs, and the concrete sample to be detected can be conveniently pressed and fixed, so that the practicability of the testing device is greatly improved, and the problems in the background technology are solved.
In order to achieve the above purpose, the present invention provides the following technical solutions: a building concrete strength testing device comprising: the test device comprises a base and a bracket arranged at the top of the base, wherein a test mechanism is arranged in the bracket, and clamping mechanisms are arranged at the bottoms of two sides of the bracket;
the testing mechanism is used for testing the strength of the building concrete;
the clamping mechanism is used for clamping and fixing the concrete sample to be tested;
the testing mechanism comprises a mounting seat, an adjusting component is mounted on one side of the mounting seat, guide posts are fixedly connected to two sides of the bottom of the mounting seat, a testing component and a lifting component are sequentially mounted on the guide posts, a driving component is mounted on the mounting seat and corresponds to the lifting component, a measuring ruler is fixedly connected to one side of the top of the mounting seat, and a limiting component is fixedly connected to the other side of the mounting seat.
By adopting the technical scheme, the device is novel in structure and simple and convenient to operate, in the testing process, the height and the horizontal position of the concrete sample to be detected are conveniently and correspondingly adjusted according to actual needs, and the concrete sample to be detected is conveniently pressed and fixed, so that the practicability of the testing device is greatly improved.
Preferably, the adjusting component comprises a threaded sleeve fixedly connected to the support, an adjusting bolt is connected to the threaded sleeve in a threaded mode, the end portion of the adjusting bolt is rotatably connected to the side face of the mounting seat through a ball bearing, and the adjusting component further comprises a rotary handle fixedly connected to the adjusting bolt.
Through adopting above-mentioned technical scheme, conveniently adjust the horizontal position of test assembly to can adjust different impact positions, consequently improve the practicality.
Preferably, the test assembly comprises a shell which is connected to the guide post in a sliding manner, an iron block is fixedly connected to the top of the shell, a pressure sensor is mounted on the top of the inner wall of the shell, a pressing block is arranged at the bottom of the pressure sensor, a connecting rod is fixedly connected to the bottom of the pressing block, a test head is fixedly connected to the bottom of the connecting rod, and a sleeve spring is sleeved on the connecting rod.
By adopting the technical scheme, the reaction force of the impact of the test head and the concrete sample block is utilized to act on the pressure sensor and is displayed through the external display, so that the strength measurement of the concrete sample block is realized.
Preferably, the lifting assembly comprises a mounting plate sleeved on the guide post, an electromagnet is mounted at the bottom of the mounting plate, a rack plate is fixedly connected to the top of the mounting plate, a pointer is fixedly connected to the top of the side face of the rack plate, the driving assembly comprises a servo motor fixedly mounted on the mounting seat, a driving shaft is fixedly connected to an output shaft of the servo motor, and a driving gear meshed with the rack plate is fixedly connected to the other end of the driving shaft.
By adopting the technical scheme, the height of the test assembly is convenient to adjust, so that the impact force on the concrete sample block can be adjusted, and the practicability of the invention is improved.
Preferably, one end of the driving shaft far away from the servo motor is rotatably mounted on the mounting seat through a ball bearing.
Through adopting above-mentioned technical scheme, increased drive shaft pivoted stability to improved the stability to test assembly altitude mixture control.
Preferably, the limiting component comprises a mounting rod fixedly connected to the side face of the mounting seat, the side face of the mounting rod is fixedly connected with a symmetrically arranged limiting sliding rod, and the limiting sliding rod is slidably connected to the support through a limiting sliding sleeve.
Through adopting above-mentioned technical scheme, play limiting displacement to the mount pad to increased the test assembly of mount pad bottom, the stability of horizontal position regulation.
Preferably, the clamping mechanism comprises a mounting sleeve fixedly connected to the bottom of the side face of the support, the side faces of the mounting sleeve are fixedly connected with symmetrically arranged clamping springs, the other ends of the two clamping springs are fixedly connected through clamping plates, one side, close to the clamping springs, of the clamping plates is fixedly connected with a pull rod, and the other ends of the pull rods movably penetrate through the support.
By adopting the technical scheme, the concrete sample block to be tested is clamped and fixed conveniently, so that the convenience of detection is improved.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, through the mutual coordination among the base, the support, the testing mechanism and the clamping mechanism, the device for testing the strength of the building concrete is novel in structure, simple and convenient to operate, and in the testing process, the height and the horizontal position of the concrete sample to be tested are conveniently and correspondingly adjusted according to actual needs, and the concrete sample to be tested is conveniently pressed and fixed, so that the practicability of the testing device is greatly improved.
Drawings
FIG. 1 is a schematic structural view of a construction concrete strength testing device of the present invention;
FIG. 2 is a schematic structural view of another view of the building concrete strength testing apparatus of the present invention;
FIG. 3 is a schematic structural view of a bracket in the construction concrete strength testing device of the present invention;
FIG. 4 is a schematic structural view of a testing mechanism in the building concrete strength testing device of the present invention;
FIG. 5 is a schematic view of a construction of another view of the testing mechanism of the apparatus for testing strength of building concrete according to the present invention;
FIG. 6 is a schematic structural view of an adjusting assembly in the building concrete strength testing apparatus of the present invention;
FIG. 7 is a schematic view showing the internal structure of a test assembly in the construction concrete strength test apparatus according to the present invention;
FIG. 8 is a schematic view of the structure of the lifting assembly in the building concrete strength testing device of the present invention;
FIG. 9 is a schematic view of the structure of the driving assembly in the construction concrete strength testing apparatus of the present invention;
FIG. 10 is a schematic view of the structure of the spacing assembly of the building concrete strength testing device of the present invention;
fig. 11 is a schematic structural view of a clamping mechanism in the construction concrete strength testing apparatus of the present invention.
In the figure: 1. a base; 2. a bracket; 3. a testing mechanism; 4. a clamping mechanism; 301. a mounting base; 302. an adjustment assembly; 303. a guide post; 304. a testing component; 305. a lifting assembly; 306. a drive assembly; 307. a measuring ruler; 308. a limit component; 3021. a thread sleeve; 3022. an adjusting bolt; 3023. rotating the handle; 3041. a housing; 3042. iron blocks; 3043. a pressure sensor; 3044. briquetting; 3045. a connecting rod; 3046. a test head; 3047. sleeving a spring; 3051. a mounting plate; 3052. an electromagnet; 3053. rack plate; 3054. a pointer; 3061. a servo motor; 3062. a drive shaft; 3063. a drive gear; 3081. a mounting rod; 3082. a limit slide bar; 3083. a limit sliding sleeve; 401. a mounting sleeve; 402. a clamping spring; 403. a clamping plate; 404. and (5) a pull rod.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 to 11, the present invention provides a technical solution:
as shown in fig. 1 to 11, a construction concrete strength testing apparatus includes:
the testing device comprises a base 1 and a bracket 2 arranged at the top of the base 1, wherein a testing mechanism 3 is arranged in the bracket 2, and clamping mechanisms 4 are arranged at the bottoms of two sides of the bracket 2;
wherein the testing mechanism 3 is used for testing the strength of the building concrete;
the clamping mechanism 4 is used for clamping and fixing the concrete sample block to be tested;
the test mechanism 3 comprises a mounting seat 301, an adjusting component 302 is mounted on one side of the mounting seat 301, guide columns 303 are fixedly connected to two sides of the bottom of the mounting seat 301, a test component 304 and a lifting component 305 are sequentially mounted on the two guide columns 303, a driving component 306 is mounted on the mounting seat 301 and corresponds to the lifting component 305, a measuring ruler 307 is fixedly connected to one side of the top of the mounting seat 301, and a limiting component 308 is fixedly connected to the other side of the mounting seat 301.
By adopting the technical scheme, the device is novel in structure and simple and convenient to operate, in the testing process, the height and the horizontal position of the concrete sample to be detected are conveniently and correspondingly adjusted according to actual needs, and the concrete sample to be detected is conveniently pressed and fixed, so that the practicability of the testing device is greatly improved.
As shown in fig. 1-11, in order to facilitate adjustment of the horizontal position of the test assembly 304, so that different impact positions can be adjusted, thereby improving practicality, the adjustment assembly 302 includes a threaded sleeve 3021 fixedly connected to the bracket 2, an adjusting bolt 3022 is screwed to the threaded sleeve 3021, an end portion of the adjusting bolt 3022 is rotatably connected to a side surface of the mounting seat 301 through a ball bearing, and the adjustment assembly 302 further includes a rotary handle 3023 fixedly connected to the adjusting bolt 3022.
As shown in fig. 1 to 11, in order to utilize the reaction force of the impact of the test head 3046 and the concrete sample block to act on the pressure sensor 3043 and display through an external display, so as to realize the strength measurement of the concrete sample block, the test assembly 304 comprises a housing 3041 slidingly connected to the guide post 303, the top of the housing 3041 is fixedly connected with an iron block 3042, the pressure sensor 3043 is mounted on the top of the inner wall of the housing 3041, a pressing block 3044 is arranged at the bottom of the pressure sensor 3043, a connecting rod 3045 is fixedly connected to the bottom of the pressing block 3044, the bottom of the connecting rod 3045 is fixedly connected with the test head 3046, and a sleeve spring 3047 is sleeved on the connecting rod 3045.
As shown in fig. 1 to 11, in order to adjust the height of the test assembly 304 conveniently, the impact force on the concrete sample block can be adjusted, so that the practicability of the invention is improved, the lifting assembly 305 comprises a mounting plate 3051 sleeved on the guide post 303, an electromagnet 3052 is mounted at the bottom of the mounting plate 3051, a rack plate 3053 is fixedly connected to the top of the mounting plate 3051, a pointer 3054 is fixedly connected to the top of the side surface of the rack plate 3053, the driving assembly 306 comprises a servo motor 3061 fixedly mounted on the mounting seat 301, a driving shaft 3062 is fixedly connected to an output shaft of the servo motor 3061, and a driving gear 3063 meshed with the rack plate 3053 is fixedly connected to the other end of the driving shaft 3062.
As shown in fig. 1-11, to increase the stability of the rotation of the drive shaft 3062 and thus the stability of the height adjustment of the test assembly 304, the end of the drive shaft 3062 remote from the servo motor 3061 is rotatably mounted on the mount 301 by a ball bearing.
As shown in fig. 1 to 11, in order to play a limiting role on the mounting seat 301, a testing component 304 at the bottom of the mounting seat 301 is added, and stability of horizontal position adjustment is improved, the limiting component 308 comprises a mounting rod 3081 fixedly connected to the side surface of the mounting seat 301, a symmetrically arranged limiting slide rod 3082 is fixedly connected to the side surface of the mounting rod 3081, and the limiting slide rod 3082 is slidably connected to the support 2 through a limiting slide sleeve 3083.
As shown in fig. 1-11, for convenience, the concrete sample to be tested is clamped and fixed, so that the convenience of detection is improved, the clamping mechanism 4 comprises a mounting sleeve 401 fixedly connected to the bottom of the side surface of the bracket 2, the side surfaces of the mounting sleeve 401 are fixedly connected with symmetrically arranged clamping springs 402, the other ends of the two clamping springs 402 are fixedly connected through a clamping plate 403, one side, close to the clamping springs 402, of the clamping plate 403 is fixedly connected with a pull rod 404, and the other end of the pull rod 404 movably penetrates through the bracket 2.
According to the technical scheme, the working steps of the scheme are summarized and carded:
firstly, a concrete sample block to be tested is placed on a base 1, under the action of the elasticity of a clamping spring 402, the concrete sample block is clamped and fixed through a clamping plate 403, through rotating an adjusting bolt 3022, under the action of threads of a threaded sleeve 3021, a test assembly 304 below a mounting seat 301 can be driven to conduct horizontal direction adjustment, a servo motor 3061 is opened to drive a driving gear 3063 to conduct rotation, under the action of tooth meshing of a rack plate 3053, the height adjustment of the test assembly 304 can be achieved, after the adjustment is completed as required, the power supply of an electromagnet 3052 is disconnected, so that the test assembly 304 falls freely, impact test is conducted on the concrete sample block through a test head 3046, and during the test, the acting force born by the test head 3046 is reacted on a pressure sensor 3043 through a connecting rod 3045 and displayed through an external display.
To sum up: the building concrete strength testing device is novel in structure and simple and convenient to operate, in the testing process, the height and the horizontal position of the building concrete are conveniently and correspondingly adjusted according to actual needs, and the concrete sample to be detected is conveniently pressed and fixed, so that the practicability of the testing device is greatly improved.
None of the inventions are related to the same or are capable of being practiced in the prior art. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A building concrete strength testing device, comprising:
base (1) and install support (2) at base (1) top, support (2) internally mounted has accredited testing organization (3), clamping mechanism (4) are all installed to the bottom of support (2) both sides, wherein:
the testing mechanism (3) is used for testing the strength of the building concrete;
the clamping mechanism (4) is used for clamping and fixing the concrete sample block to be tested;
the test mechanism (3) comprises a mounting seat (301), one side of the mounting seat (301) is provided with an adjusting component (302), both sides of the bottom of the mounting seat (301) are fixedly connected with guide posts (303), the two guide posts (303) are sequentially provided with a test component (304) and a lifting component (305), the mounting seat (301) is provided with a driving component (306) corresponding to the lifting component (305), one side of the top of the mounting seat (301) is fixedly connected with a measuring ruler (307), the other side of the mounting seat (301) is fixedly connected with a limiting component (308),
the adjusting assembly (302) comprises a threaded sleeve (3021) fixedly connected to the support (2), an adjusting bolt (3022) is connected to the threaded sleeve (3021) in a threaded mode, the end portion of the adjusting bolt (3022) is connected to the side face of the mounting seat (301) in a rotating mode through a ball bearing, the adjusting assembly (302) further comprises a rotating handle (3023) fixedly connected to the adjusting bolt (3022), the testing assembly (304) comprises a shell (3041) which is connected to the guide column (303) in a sliding mode, an iron block (3042) is fixedly connected to the top of the shell (3041), a pressure sensor (3043) is mounted on the top of the inner wall of the shell (3041), a pressing block (3045) is arranged at the bottom of the pressure sensor (3043), a connecting rod (3045) is fixedly connected to the bottom of the pressing block (3045), a testing head (3046) is fixedly connected to the bottom of the connecting rod (3045), and a spring (3047) is sleeved on the connecting rod (3045);
lifting component (305) are including the cover establish mounting panel (3051) on guide post (303), electro-magnet (3052) are installed to the bottom of mounting panel (3051), the top fixedly connected with rack board (3053) of mounting panel (3051), the top fixedly connected with pointer (3054) of rack board (3053) side.
2. The building concrete strength testing device according to claim 1, wherein: the driving assembly (306) comprises a servo motor (3061) fixedly installed on the installation seat (301), a driving shaft (3062) is fixedly connected to an output shaft of the servo motor (3061), and a driving gear (3063) meshed with the rack plate (3053) is fixedly connected to the other end of the driving shaft (3062).
3. A building concrete strength testing device according to claim 2, wherein: one end of the driving shaft (3062) far away from the servo motor (3061) is rotatably mounted on the mounting seat (301) through a ball bearing.
4. A building concrete strength testing device according to claim 3, wherein: the limiting component (308) comprises a mounting rod (3081) fixedly connected to the side face of the mounting seat (301), a limiting slide rod (3082) symmetrically arranged is fixedly connected to the side face of the mounting rod (3081), and the limiting slide rod (3082) is slidably connected to the support (2) through a limiting sliding sleeve (3083).
5. The building concrete strength testing device according to claim 4, wherein: clamping mechanism (4) are in including fixed connection installation cover (401) of support (2) side bottom, the side fixedly connected with symmetry of installation cover (401) sets up clamp spring (402), two the other end of clamp spring (402) is through clamp plate (403) fixed connection, clamp plate (403) are close to one side fixedly connected with pull rod (404) of clamp spring (402), just the other end activity of pull rod (404) runs through support (2) set up.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111317014.2A CN114018728B (en) | 2021-11-09 | 2021-11-09 | Building concrete strength testing arrangement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111317014.2A CN114018728B (en) | 2021-11-09 | 2021-11-09 | Building concrete strength testing arrangement |
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| Publication Number | Publication Date |
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| CN114018728A CN114018728A (en) | 2022-02-08 |
| CN114018728B true CN114018728B (en) | 2023-11-07 |
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| CN202111317014.2A Active CN114018728B (en) | 2021-11-09 | 2021-11-09 | Building concrete strength testing arrangement |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115541416A (en) * | 2022-10-13 | 2022-12-30 | 江苏锡信工程检测有限公司 | Building material comprehensive detection system and method |
| CN115628976B (en) * | 2022-10-24 | 2023-07-28 | 中嘉(广东)工程检测有限公司 | Building material strength detection system and detection method |
| CN117074220B (en) * | 2023-10-17 | 2023-12-26 | 上海贝恒人居建设集团南通有限公司 | Intensity testing device for large-volume concrete prefabricated part |
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| KR20100127546A (en) * | 2009-05-26 | 2010-12-06 | 현대제철 주식회사 | Pressing device for testing bending strength |
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| CN114018728A (en) | 2022-02-08 |
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