CN215178496U - Experimental device for be used for steel construction goods shelves anti-seismic performance to detect - Google Patents
Experimental device for be used for steel construction goods shelves anti-seismic performance to detect Download PDFInfo
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- CN215178496U CN215178496U CN202121561788.5U CN202121561788U CN215178496U CN 215178496 U CN215178496 U CN 215178496U CN 202121561788 U CN202121561788 U CN 202121561788U CN 215178496 U CN215178496 U CN 215178496U
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 24
- 239000010959 steel Substances 0.000 title claims abstract description 24
- 238000010276 construction Methods 0.000 title claims description 5
- 238000006073 displacement reaction Methods 0.000 claims abstract description 26
- 230000001133 acceleration Effects 0.000 claims abstract description 15
- 238000004088 simulation Methods 0.000 claims abstract description 10
- 238000007789 sealing Methods 0.000 claims description 29
- 230000003116 impacting effect Effects 0.000 claims description 11
- 238000009434 installation Methods 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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Abstract
The utility model discloses an experimental device for detecting the anti-seismic performance of a steel structure goods shelf, which comprises a goods shelf to be detected and a collision simulation device, wherein each layer of frame plate of the goods shelf to be detected is respectively provided with a storage box, one end of the goods shelf to be detected is provided with a support frame fixedly connected with a displacement sensor, an angular displacement sensor is respectively and fixedly installed at a beam column node on the goods shelf to be detected, the collision simulation device comprises a base provided with a slide rail, the base is slidably connected with a moving trolley for colliding the goods shelf to be detected, one side of the moving trolley is provided with an accelerating system for providing the moving acceleration for the moving trolley, the utility model simulates the collision of the goods shelf to be detected by arranging the collision simulation device, the angular displacement sensor is arranged at the beam column node on the goods shelf to be detected, the support frame connected with the displacement sensor is arranged at one side of the goods shelf to be detected, the deformation quantity of the goods shelf to be detected can be detected, so that the anti-seismic performance of the goods shelf to be detected can be detected.
Description
Technical Field
The utility model relates to a logistics storage engineering technical field is applicable to steel construction goods shelves's antidetonation design and performance aassessment in logistics storage equipment trade, specifically is an experimental apparatus that is used for steel construction goods shelves antidetonation performance to detect.
Background
Under the earthquake impact environment, the safety problem of the design and the use of the thin-wall steel goods shelf is increasingly prominent. Compared with the common building steel structure, the steel shelf component has the structural characteristics of thin wall and multiple holes, and has differences in section form (opening), node connection, material performance and the like.
After the thin-wall steel goods shelf structure is subjected to a strong shock effect, the thin-wall steel goods shelf structure generally enters an elastic-plastic state, and the rigidity of a structural matrix, the damage degree of parts and the connection failure mode of the thin-wall steel goods shelf structure can be changed. The steel structure goods shelf anti-seismic performance detection can be realized by simulating the impact force acting on the goods shelf when an earthquake occurs, and the anti-seismic performance of the steel structure goods shelf can be obtained by carrying out a plurality of times of experiment comparison through continuously changing the acting force of the simulation device acting on the goods shelf. Therefore, the simulator capable of simulating the impact force of the earthquake needs to be designed, so that the earthquake-resistant performance detection of the steel structure goods shelf is realized.
Disclosure of Invention
The utility model aims to provide an experimental device for detecting the anti-seismic performance of a steel structure goods shelf, which is characterized by comprising a goods shelf to be detected and a collision simulation device, wherein each layer of frame plate of the goods shelf to be detected is respectively provided with a storage box, a group of protective guards which are respectively connected with two adjacent support columns in a sliding way and are used for preventing the storage box from sliding off are arranged between the two adjacent support columns on the goods shelf to be detected, the protective guards are provided with a plurality of groups and are respectively positioned above each layer of frame plate of the goods shelf to be detected, one end of the goods shelf to be detected is provided with a support frame fixedly connected with a displacement sensor, one end of the displacement sensor is propped against one end of the goods shelf to be detected, beam column nodes on the goods shelf to be detected are respectively and fixedly provided with an angular displacement sensor, the bottoms of the goods shelf to be detected and the support frame are respectively and fixedly provided with a connecting component for being fixedly connected with the ground, the impact simulation device comprises a base provided with a slide rail, a moving trolley used for impacting a goods shelf to be tested is connected to the base in a sliding mode, an acceleration system used for providing motion acceleration for the moving trolley is arranged on one side of the moving trolley, a baffle is arranged on the impact side of the moving trolley, a force sensor is arranged between the moving trolley and the baffle, and two ends of the force sensor are fixedly connected with the moving trolley and the baffle respectively.
Preferably, the accelerating system comprises a first foldable cylindrical flexible airbag, a sleeve barrel is sleeved on the outer portion of the first foldable cylindrical flexible airbag, a sealing plate I is connected to one end of the first foldable cylindrical flexible airbag in a sealing mode, the other end of the first foldable cylindrical flexible airbag is communicated with an air storage barrel through a first air guide hose, a pulley is fixedly installed at the bottom of the sleeve barrel, the bottom, far away from one end of the sealing plate I, of the sleeve barrel is provided with a second foldable cylindrical flexible airbag in sliding connection with a base, a sealing plate II is connected to one end of the second foldable cylindrical flexible airbag in a sealing mode, the other end of the second foldable cylindrical flexible airbag is communicated with the air storage barrel through a second air guide hose, the first sealing plate is abutted to a moving trolley, the second sealing plate is fixedly connected with the sleeve barrel, and electromagnetic valves are arranged on the first air guide hose and the second air guide hose respectively.
Preferably, coupling assembling is including fixed setting at subaerial mounting base, the installation blade of fixed mounting in the bottom of the goods shelves/support frame that awaits measuring, the holding bolt of being connected with mounting base is worn to be equipped with at the both ends of installation blade.
Preferably, the two sides of the pillar on the shelf to be tested are respectively provided with a mounting seat for mounting the guard rail, the mounting seat is provided with a sliding groove, and the two ends of the guard rail are respectively provided with a sliding block in sliding connection with the sliding groove.
Preferably, a plurality of displacement sensors are correspondingly arranged at the node of each layer of cross beam of the shelf to be measured, and the displacement sensors are centrally and symmetrically distributed relative to the two nodes of each layer of cross beam.
Preferably, the impact surface of the baffle is fixedly provided with a rubber gasket.
Preferably, an air inlet is arranged on the air storage cylinder.
Compared with the prior art, the beneficial effects of the utility model are that:
1. through set up the storage box on the goods shelves that await measuring to and set up the rail guard that is used for preventing the storage box landing between two adjacent stands on the goods shelves that await measuring, realized exerting vertical load to the goods shelves that await measuring.
2. Can simulate the striking to the goods shelves that await measuring through setting up striking analogue means, set up the angle displacement sensor at the beam column node on the goods shelves that await measuring to and set up the support frame that is connected with the displacement sensor in one side of the goods shelves that await measuring, thereby the deformation volume of detectable goods shelves that await measuring realizes the anti-seismic performance detection of the goods shelves that await measuring.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention.
In the drawings:
FIG. 1 is a schematic structural diagram of a main view of an experimental apparatus for detecting the anti-seismic performance of a steel-structure shelf provided by the utility model;
FIG. 2 is a schematic view of a partial structure of an acceleration system of an experimental apparatus for detecting the anti-seismic performance of a steel-structure shelf according to the present invention;
fig. 3 is a schematic view of a guard rail mounting structure of an experimental apparatus for detecting the anti-seismic performance of a steel-structure shelf according to the present invention;
fig. 4 is a schematic view of a partial structure of a guard rail of an experimental apparatus for detecting the anti-seismic performance of a steel-structure shelf provided by the utility model;
description of reference numerals:
1-a goods shelf to be tested, 2-an impact simulation device, 3-a protective guard, 4-a support frame, 5-a displacement sensor, 6-a storage box, 7-an angular displacement sensor, 8-a connection assembly, 101-a mounting seat, 11-an air inlet, 1011-a chute, 201-a base, 202-a moving trolley, 203-an acceleration system, 204-a baffle, 205-a force sensor, 2031-a sleeve, 2032-a foldable cylindrical flexible air bag I, 2033-a sealing plate I, 2034-an air storage cylinder, 2035-an air guide hose I, 2036-a foldable cylindrical flexible air bag II, 2037-a sealing plate II, 2038-an air guide hose II, 2039-an electromagnetic valve, 301-a sliding block, 801-a base, 802-an installation blade and 803-a fastening bolt, 2041 rubber gasket.
Detailed Description
In the following, the technical solutions in the embodiments of the present invention are clearly and completely described with reference to the drawings in the embodiments of the present invention, but it should be understood that the scope of the present invention is not limited by the specific embodiments.
Example (b):
as shown in fig. 1-4, an experimental apparatus for detecting the anti-seismic performance of a steel structure shelf is characterized by comprising a shelf 1 to be detected and an impact simulation device 2, wherein a storage box 6 is placed on each layer of shelf board of the shelf 1 to be detected, a group of guard rails 3 which are respectively connected with two support posts in a sliding manner and used for preventing the storage box 6 from sliding off are arranged between two adjacent support posts on the shelf 1 to be detected, the guard rails 3 are provided with a plurality of groups and are respectively positioned above each layer of shelf board of the shelf 1 to be detected, one end of the shelf 1 to be detected is provided with a support frame 4 fixedly connected with a displacement sensor 5, one end of the displacement sensor 5 is abutted against one end of the shelf 1 to be detected, an angular displacement sensor 7 is respectively and fixedly installed at a beam-column node on the shelf 1 to be detected, and a connecting assembly 8 fixedly connected with the ground is respectively installed at the bottoms of the shelf 1 to be detected and the support frame 4, the impact simulation device 2 comprises a base 201 provided with a slide rail, the base 201 is connected with a moving trolley 202 used for impacting the shelf 1 to be tested in a sliding way, one side of the moving trolley 202 is provided with an accelerating system 203 used for providing motion acceleration for the moving trolley 202, the impacting side of the moving trolley 202 is provided with a baffle 204, a force sensor 205 is arranged between the moving trolley 202 and the baffle 204, two ends of the force sensor 205 are respectively fixedly connected with the moving trolley 202 and the baffle 204, the moving trolley 202 is driven by the accelerating system 203 to move on the slide rail on the base 201 in an accelerating way so as to impact the shelf 1 to be tested fixed on the ground, the displacement sensor 5 and the angular displacement sensor 7 are used for measuring the deformation generated by a beam column on the shelf 1 to be tested, and the force sensor 205 is used for measuring the acting force when the moving trolley impacts the shelf 1 to be tested, the acceleration system 203 is used for continuously changing the movement speed of the moving trolley 202, so that the change of the impact force of the moving trolley 202 on the goods shelf is realized, and the anti-seismic performance of the steel structure goods shelf can be simulated and detected through multiple tests.
The acceleration system 203 comprises a first foldable cylindrical flexible air bag 2032 sleeved with a sleeve 2031, one end of the first foldable cylindrical flexible air bag 2032 is connected with a first sealing plate 2033 in a sealing manner, the other end of the first foldable cylindrical flexible air bag 2032 is communicated with an air storage cylinder 2034 fixedly arranged on one side of the base 201 through a first air guide hose 2035, the bottom of the sleeve 2031 is fixedly provided with a pulley, the bottom of one end of the sleeve 2031 far away from the first sealing plate 2033 is provided with a second foldable cylindrical flexible air bag 2036 in a sliding manner with the base 201, one end of the second foldable cylindrical flexible air bag 2036 is connected with a second sealing plate 2037 in a sealing manner, the other end of the second foldable cylindrical flexible air bag 2036 is communicated with the air storage cylinder 2034 through a second air guide hose 2038, the first sealing plate 2033 is abutted against the moving trolley 202, and the second sealing plate 2037 is fixedly connected with the sleeve 2031, electromagnetic valves 2039 are respectively arranged on the first air guide hose 2035 and the second air guide hose 2038, firstly, the electromagnetic valve 2039 on the first air guide hose 2035 is opened, the air storage cylinder 2034 inflates the first foldable cylindrical flexible air bag 2032, the first foldable cylindrical flexible air bag 2032 gradually expands, then the first sealing plate 2033 pushes the moving trolley 202 to move, the air storage cylinder 2034 continuously inflates the first foldable cylindrical flexible air bag 2032, when the first foldable cylindrical flexible air bag 2032 completely expands, the electromagnetic valve 2039 on the second air guide hose 2038 is opened, then the air storage cylinder 2034 inflates the second foldable cylindrical flexible air bag 2036, the second foldable cylindrical flexible air bag 2036 gradually expands, then the second sealing plate 2037 pushes the sleeve 2031 to move, thus the first foldable cylindrical flexible air bag 2032 and the first sealing plate 2033 inside the sleeve 2031 can move, and the acceleration movement of the moving trolley can be realized, in practical application, the diameter of the first foldable cylindrical flexible airbag 2032 can be set to be smaller than the diameter of the second foldable cylindrical flexible airbag 2036, so that the second foldable cylindrical flexible airbag 2036 can be rapidly unfolded to provide motion acceleration for the moving trolley 202, the moving trolley 202 can move on the slide rail of the base 201 in an accelerated manner to finally impact the shelf 1 to be tested on one side of the base 201, the force sensor 205 on the impact surface of the moving trolley can measure the acting force of the moving trolley when impacting the shelf 1 to be tested, and the second foldable cylindrical flexible airbag 2036 with different diameters can be replaced in the experimental process, so that the moving speed of the moving trolley 202 when impacting the shelf 1 to be tested can be changed, the acting force of the moving trolley 202 when impacting the shelf 1 to be tested can be changed, and the deformation quantity of the shelf 1 to be tested when different acting forces are counted, the acting force of the moving trolley 202 when impacting the goods shelf 1 to be tested is continuously changed until the goods shelf to be tested is damaged.
The connecting assembly 8 comprises a mounting base 801 fixedly arranged on the ground, and a mounting blade 802 fixedly arranged at the bottom of the shelf 1/support frame 4 to be tested, wherein fastening bolts 803 connected with the mounting base 901 penetrate through two ends of the mounting blade, and in order to realize the fixed connection between the shelf 1/support frame 4 to be tested and the ground, the movement trolley 202 is prevented from toppling over or moving the shelf 1 to be tested when impacting the shelf 1 to be tested.
The two sides of the pillar on the shelf 1 to be tested are respectively provided with the mounting seats 101 for mounting the guard rail 3, the mounting seats 101 are provided with the sliding grooves 1011, the two ends of the guard rail 3 are respectively provided with the sliding blocks 301 which are in sliding connection with the sliding grooves 1011, the sliding connection between the guard rail 3 and the pillar on the shelf 1 to be tested can be realized by sliding the sliding blocks 301 on the guard rail 3 into the sliding grooves 1011, and the guard rail 3 can be conveniently assembled and disassembled.
The displacement sensors 5 are arranged at the nodes of each layer of the cross beam of the shelf to be measured 1 correspondingly, the displacement sensors 5 are distributed in a central symmetry mode relative to the two nodes of each layer of the cross beam, and displacement change generated by the cross beam after load is applied to the shelf to be measured 1 is measured accurately.
The impact surfaces of the baffle 204 are fixedly provided with rubber gaskets 2041, so that collision damage of the two impact surfaces is avoided.
The air cylinder 2034 is provided with an air inlet 11 for conveniently inflating the air cylinder 2034.
The utility model discloses a theory of operation and use flow: when carrying out anti-seismic performance and examining, need prepare two 1 samples of goods shelves that await measuring, to one of them goods shelves 1 that await measuring carry out the beam column that parallels with the orientation that goods shelves placed the tunnel that forms and strike, and place the weight of the goods in the storage box 6 on goods shelves 1 that await measuring through the change, can realize acting on the change of the vertical load on goods shelves 1 that await measuring, carry out the beam column with the orientation looks vertically in tunnel to another goods shelves 1 that await measuring and strike, and place the weight of the goods in the storage box 6 on goods shelves 1 that await measuring through the change, can realize acting on the change of the vertical load on goods shelves 1 that await measuring.
The acceleration system 203 is utilized to drive the moving trolley 202 to move, firstly, the electromagnetic valve 2039 on the air guide hose I2035 is opened, the air storage cylinder 2034 inflates the foldable cylindrical flexible air bag I2032, the foldable cylindrical flexible air bag I2032 gradually expands, the sealing plate I2033 pushes the moving trolley 202 to move, the air storage cylinder 2034 continuously inflates the foldable cylindrical flexible air bag I2032, when the foldable cylindrical flexible air bag I2032 completely expands, the electromagnetic valve 2039 on the air guide hose II 2038 is opened, the air storage cylinder 2034 inflates the foldable cylindrical flexible air bag II 2036, the foldable cylindrical flexible air bag II 2036 gradually expands, the sealing plate II 2037 pushes the sleeve 2031 to move, the movement of the foldable cylindrical flexible air bag I2032 and the sealing plate I2033 inside the sleeve 2031 can be realized, the acceleration movement of the moving trolley can be realized, and in practical application, the diameter of the foldable cylindrical flexible air bag I2032 can be set to be smaller than that of the foldable cylindrical flexible air bag I2033 The diameter of the second 2036 is convenient for the second 2036 foldable cylindrical flexible airbag to rapidly expand to provide motion acceleration for the motion trolley 202, the motion trolley 202 accelerates on the slide rail of the base 201, and finally impacts the shelf 1 to be tested on one side of the base 201, the force sensor 205 on the impact surface of the motion trolley can measure the acting force generated when the motion trolley impacts the shelf 1 to be tested, during the experiment, the second foldable cylindrical flexible air bag 2036 with different diameters can be replaced, thereby changing the moving speed of the moving trolley 202 when impacting the goods shelf 1 to be measured, changing the acting force of the moving trolley 202 when impacting the goods shelf 1 to be measured, and the deformation quantity generated by the shelf 1 to be tested is counted when different acting forces are applied, and the acting force generated when the moving trolley 202 impacts the shelf 1 to be tested is continuously changed until the shelf to be tested is damaged.
Finally, the description is as follows: the above disclosure is only one specific embodiment of the present invention, however, the present invention is not limited thereto, and any changes that can be considered by those skilled in the art should fall within the protection scope of the present invention.
Claims (7)
1. The utility model provides an experimental apparatus for be used for steel construction goods shelves anti-seismic performance to detect, its characterized in that, including goods shelves (1) that await measuring, striking analogue means (2), storage box (6) have been placed respectively on every layer of frame plate of goods shelves (1) that await measuring, be equipped with between two adjacent pillars on goods shelves (1) that await measuring and be used for preventing a set of rail guard (3) of storage box (6) landing with two pillars sliding connection respectively, rail guard (3) are equipped with the multiunit and are located the top of every layer of frame plate of goods shelves (1) that await measuring respectively, the one end of goods shelves (1) that await measuring is equipped with support frame (4) that fixed connection has displacement sensor (5), the one end of displacement sensor (5) is inconsistent with the one end of goods shelves (1) that await measuring, beam column node on goods shelves (1) that await measuring respectively fixed mounting has angle displacement sensor (7), the bottoms of the shelf (1) to be tested and the support frame (4) are respectively and fixedly provided with a connecting component (8) which is fixedly connected with the ground;
the impact simulation device (2) comprises a base (201) provided with a sliding rail, a moving trolley (202) used for impacting a shelf (1) to be tested is connected to the base (201) in a sliding mode, an acceleration system (203) used for providing motion acceleration for the moving trolley (202) is arranged on one side of the moving trolley (202), a baffle (204) is arranged on the impact side of the moving trolley (202), a force sensor (205) is arranged between the moving trolley (202) and the baffle (204), and two ends of the force sensor (205) are fixedly connected with the moving trolley (202) and the baffle (204) respectively.
2. The experimental device for detecting the earthquake-resistant performance of the steel structure goods shelf according to the claim 1 is characterized in that: the accelerating system (203) comprises a first foldable cylindrical flexible air bag (2032) externally sleeved with a sleeve (2031), one end of the first foldable cylindrical flexible air bag (2032) is connected with a first sealing plate (2033) in a sealing manner, the other end of the first foldable cylindrical flexible air bag (2032) is communicated with an air storage cylinder (2034) through a first air guide hose (2035), a pulley is fixedly mounted at the bottom of the sleeve (2031), a second foldable cylindrical flexible air bag (2036) in sliding connection with a base (201) is arranged at the bottom of one end, far away from the first sealing plate (2033), of the sleeve (2031), one end of the second foldable cylindrical flexible air bag (2036) is connected with a second sealing plate (2037) in a sealing manner, the other end of the second foldable cylindrical flexible air bag (2036) is communicated with the air storage cylinder (2034) through a second air guide hose (2038), and the first sealing plate (2033) is abutted against the moving trolley (202), the second sealing plate (2037) is fixedly connected with the sleeve (2031), and the first air guide hose (2035) and the second air guide hose (2038) are respectively provided with an electromagnetic valve (2039).
3. The experimental device for detecting the earthquake-resistant performance of the steel structure goods shelf according to the claim 1 is characterized in that: coupling assembling (8) are including fixed setting at subaerial mounting base (801), and fixed mounting is in installation blade (802) of the bottom of goods shelves (1)/support frame (4) that awaits measuring, tight set bolt (803) of being connected with mounting base (801) are worn to be equipped with at the both ends of installation blade.
4. The experimental device for detecting the earthquake-resistant performance of the steel structure goods shelf according to the claim 1 is characterized in that: the two sides of a support column on the goods shelf (1) to be tested are respectively provided with a mounting seat (101) for mounting the protective guard (3), the mounting seat (101) is provided with a sliding groove (1011), and two ends of the protective guard (3) are respectively provided with a sliding block (301) which is in sliding connection with the sliding groove (1011).
5. The experimental device for detecting the earthquake-resistant performance of the steel structure goods shelf according to the claim 1 is characterized in that: a plurality of displacement sensors (5) are correspondingly arranged at nodes of each layer of cross beams of the shelf (1) to be detected, and the displacement sensors (5) are distributed in a central symmetry mode relative to two nodes of each layer of cross beams.
6. The experimental device for detecting the earthquake-resistant performance of the steel structure goods shelf according to the claim 1 is characterized in that: and a rubber gasket (2041) is fixedly arranged on the impact surface of the baffle (204).
7. The experimental device for detecting the earthquake-resistant performance of the steel structure goods shelf according to the claim 2 is characterized in that: an air inlet (11) is arranged on the air storage cylinder (2034).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121561788.5U CN215178496U (en) | 2021-07-09 | 2021-07-09 | Experimental device for be used for steel construction goods shelves anti-seismic performance to detect |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121561788.5U CN215178496U (en) | 2021-07-09 | 2021-07-09 | Experimental device for be used for steel construction goods shelves anti-seismic performance to detect |
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| CN202121561788.5U Expired - Fee Related CN215178496U (en) | 2021-07-09 | 2021-07-09 | Experimental device for be used for steel construction goods shelves anti-seismic performance to detect |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114623999A (en) * | 2022-05-13 | 2022-06-14 | 安徽建筑大学 | Anti detection device that hits of road and bridge guardrail |
| CN114878131A (en) * | 2022-07-11 | 2022-08-09 | 江苏金秋竹集团有限公司 | Protective door impact test device |
-
2021
- 2021-07-09 CN CN202121561788.5U patent/CN215178496U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114623999A (en) * | 2022-05-13 | 2022-06-14 | 安徽建筑大学 | Anti detection device that hits of road and bridge guardrail |
| CN114623999B (en) * | 2022-05-13 | 2022-08-02 | 安徽建筑大学 | Anti detection device that hits of road and bridge guardrail |
| CN114878131A (en) * | 2022-07-11 | 2022-08-09 | 江苏金秋竹集团有限公司 | Protective door impact test device |
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