CN108593238B - Long pulse width high amplitude pneumatic impact and climate comprehensive environmental stress test device - Google Patents
Long pulse width high amplitude pneumatic impact and climate comprehensive environmental stress test device Download PDFInfo
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- CN108593238B CN108593238B CN201810433949.9A CN201810433949A CN108593238B CN 108593238 B CN108593238 B CN 108593238B CN 201810433949 A CN201810433949 A CN 201810433949A CN 108593238 B CN108593238 B CN 108593238B
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- 238000012360 testing method Methods 0.000 title claims abstract description 20
- 230000006353 environmental stress Effects 0.000 title claims abstract description 13
- 229920002635 polyurethane Polymers 0.000 claims abstract description 30
- 239000004814 polyurethane Substances 0.000 claims abstract description 30
- 238000002474 experimental method Methods 0.000 claims abstract description 24
- 238000004146 energy storage Methods 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims description 15
- 230000000452 restraining effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 230000001133 acceleration Effects 0.000 description 7
- 230000035939 shock Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 230000035882 stress Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 2
- 230000004075 alteration Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/08—Shock-testing
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a long pulse width high amplitude pneumatic impact and climate comprehensive environmental stress test device, which relates to the technical field of pneumatic impact equipment, and comprises a climate experiment box and a workbench, wherein an impact table top surface at the top of the workbench penetrates through a through hole formed in the bottom of the climate experiment box and stretches into a working chamber of the climate experiment box, the workbench comprises a workbench body and an impact table top surface, a piston rod of an energy storage impact cylinder in the workbench body penetrates through the top surface of the workbench body, the top end of the workbench body is provided with the impact table top surface, the top surface of the workbench body is provided with a waveform generator which is positioned right below the impact table top surface, and the piston rod and the impact table top surface are flexibly connected by using polyurethane springs.
Description
Technical Field
The invention relates to the technical field of pneumatic impact equipment, in particular to a multi-environment stress simulation test, environment test and reliability strengthening test device combining long-pulse-width high-amplitude pneumatic impact with climate environment stress.
Background
The existing three-comprehensive test box can simulate high and low temperature damp heat, vibration environmental stress and small-magnitude mechanical impact stress simultaneously by combining the climate test box and the mechanical vibration table, but the mechanical impact stress excited by the mechanical vibration table is at most about 100g and is far smaller than impact acceleration generated in the falling and ammunition firing processes of equipment. The equipment for generating high mechanical impact stress such as an air cannon, a free falling type falling table and a rotary arm type high acceleration centrifugal machine has large occupied area and is often accompanied by the structural characteristics of long stroke of an impact hammer or large movable radius of a rotary arm, so that the equipment is difficult to combine with a climate experiment box due to high mechanical impact.
The mechanical impact energy of the piston rod driven by the energy storage impact cylinder to impact the impact wave type generator is insufficient, long pulse width high acceleration impact is difficult to achieve, half sine wave mechanical impact with a pulse width of 1ms is usually generated, the acceleration peak value is less than 3000g, high-frequency impact response is easy to occur on an impact table in the impact process, and impact clutter is large; in addition, the piston rod is rigidly connected with the impact table top through the fastening bolts, and in the impact process, the fastening bolts are insufficient in strength and easy to deform and break, so that potential safety hazards are brought.
Disclosure of Invention
The embodiment of the invention provides a long-pulse-width high-amplitude pneumatic impact and climate comprehensive environmental stress test device, which can solve the problems in the prior art.
The invention provides a long-pulse-width high-amplitude pneumatic impact and climate comprehensive environmental stress test device, which comprises a climate experiment box and a workbench, wherein a working chamber is arranged in the climate experiment box, the top of the workbench penetrates through a through hole formed in the bottom surface of the climate experiment box to extend into the working chamber, and the workbench is in sealing connection with the bottom surface of the climate experiment box;
The workbench comprises a workbench body and an impact table top, wherein an energy storage impact cylinder is arranged in the workbench body, a piston rod of the cylinder penetrates through the top surface of the workbench body, the impact table top is arranged at the top end of the piston rod, and a waveform generator is arranged on the top surface of the workbench body and is positioned right below the impact table top;
the center of the impact table top is provided with a mounting hole, a fastening bolt is inserted from the top of the mounting hole and penetrates out from the bottom, and the bottom end of the fastening bolt is in threaded connection with the top end of the piston rod; the fastening bolt is connected with the mounting hole through a top polyurethane spring, and the mounting hole is connected with the cylinder piston rod through a bottom polyurethane spring.
Preferably, a sealing ring is arranged on the workbench, and the workbench is in sealing connection with the climate experiment box through the sealing ring.
Preferably, a deformation space for accommodating and restraining radial deformation of the top and bottom polyurethane springs is reserved in the mounting hole.
Preferably, a plurality of air springs are mounted on the bottom surface of the table body.
Preferably, gaskets are arranged at the upper end and the lower end of the top polyurethane spring and the bottom polyurethane spring.
The long-pulse-width high-amplitude pneumatic impact and climate comprehensive environmental stress test device comprises a climate experiment box and a workbench, wherein the top of the workbench penetrates through a through hole formed in the bottom surface of the climate experiment box and stretches into a working chamber of the climate experiment box, the workbench comprises a workbench body and an impact table top, a piston rod of an energy storage impact cylinder in the workbench body penetrates through the top surface of the workbench body, the top end of the workbench body is provided with the impact table top, the top surface of the workbench body is provided with a waveform generator which is positioned right below the impact table top, and the piston rod and the impact table top are flexibly connected by using a polyurethane spring.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a long pulse width high amplitude pneumatic impact and climate comprehensive environmental stress test device according to an embodiment of the present invention;
FIG. 2 is a schematic view of the longitudinal section of the test device of FIG. 1;
FIG. 3 is a state diagram of the table of FIG. 1 prior to a crash;
FIG. 4 is a state diagram of the table of FIG. 3 after a collision;
FIG. 5 is a schematic view of a longitudinal cross-sectional view of the impact table of FIG. 3;
FIG. 6 is a shock waveform of a rigid connection between a cylinder piston rod and a shock mesa;
fig. 7 is a shock waveform of a flexible connection between a cylinder piston rod and a shock mesa.
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 and 2, in an embodiment of the present invention, a long pulse width high amplitude pneumatic impact and climate integrated environmental stress test device is provided, the test device includes a climate experiment box 100 and a workbench 200, a working chamber 110 is provided in the climate experiment box 100, the top of the workbench 200 extends into the working chamber 110 through a through hole formed in the bottom surface of the climate experiment box 100, and the workbench 200 is in sealing connection with the bottom surface of the climate experiment box 100.
Referring to fig. 3, 4 and 5, the table 200 includes a table body 210 and an impact table 230, an energy storage impact cylinder (not shown) is provided in the table body 210, a piston rod 220 of the cylinder passes through a top surface of the table body 220, the impact table 230 is mounted on a top end of the piston rod 220, and a measured object 300 is fixed on the top surface of the impact table 230. As shown in fig. 5, a mounting hole is formed in the center of the impact table 230, a fastening bolt 221 is inserted from the top of the mounting hole, and passes through the bottom, and the bottom end of the fastening bolt 221 is screwed to the top end of the piston rod 220. The nuts of the fastening bolts 221 are connected with the mounting holes by using top polyurethane springs 222, and the mounting holes are connected with the cylinder piston rods 220 by using bottom polyurethane springs 223. In this embodiment, gaskets 224 are mounted on both the upper and lower ends of the top polyurethane spring 222 and the bottom polyurethane spring 223.
Since the top urethane spring 222 and the bottom urethane spring 223 are compressed in the axial direction during impact and the radial diameter is also increased, a deformation space 225 is reserved in the mounting hole. The top polyurethane spring 222 and the bottom polyurethane spring 223 automatically return to their original shapes when the cylinder air pressure is removed after the impact is completed.
The radial deformation space of the bottom polyurethane spring 223 is reserved in the mounting hole at the bottom of the impact table 230, and in the process of fixing the impact table on the mounting pre-tightening of the piston rod through the fastening bolt 221, the bottom polyurethane spring 223 is axially compressed and radially stretched to fill the residual space of the whole mounting hole, the bottom polyurethane spring 223 can enhance the coupling strength of the fastening bolt 221, reduce the high-frequency response of the impact table 230, and play a role in high-frequency filtering of mechanical impact waveforms.
The top surface of the table body 210 is provided with a waveform generator 240, the waveform generator 240 is located under the impact table surface 230, the waveform generator 240 is provided with a layer of sealing ring 250, and the workbench 200 is in sealing connection with the climate experiment box 100 through the sealing ring 250.
Based on the structure, the two polyurethane springs buffer the fastening bolt in the impact process, so that the impact time is prolonged, and the impact energy is increased by more than 2 times. The hardness and damping of the two polyurethane springs are designed according to the mass and impact strength of the impact table 230, so that the two polyurethane springs generate large longitudinal compression in the process of long-pulse high-peak acceleration impact, absorb high-frequency vibration, and inhibit impact clutter.
If a flexible connection is not used, the impact table 230 will be air-locked to the waveform generator 240 after the impact, reducing the rebound speed and impact acceleration, and also being very prone to shock, the waveform generated by the impact is shown in fig. 6. The invention enables the impact table-board 230 to generate larger rebound velocity and impact acceleration after impacting the waveform generator 240 by the flexible connection design of the polyurethane spring between the piston rod 220 and the impact table-board 230, and the waveform generated by the impact is shown in fig. 7.
Because of the large impact forces during impact, the impact table 230 is required to be lightweight, strength and frequency response. By designing the impact table 230, the diameter of the impact table 230 is not less than 80mm, the frequency response of 1-10 KHz is realized under the condition that the mass is not more than 1.5kg, the impact table is resistant to 30000g mechanical impact, and the impact table is easy to process.
The piston rod 220, the impact table 230 and the connecting pieces thereof, the top polyurethane spring 222, the bottom polyurethane spring 223 and the sealing ring 250 adopt high and low temperature resistant materials or have high and low temperature resistant characteristics, so that the high and low temperature resistant materials or the high and low temperature resistant materials can be subjected to experiments at the temperature of between 70 ℃ below zero and 150 ℃ to check the impact resistance of the tested product under the high and low temperature conditions. Meanwhile, the polyurethane springs at the top and the bottom have the characteristics of high strength, high elasticity and excellent shock absorption performance. The structure, hardness and high-low temperature characteristics of the impact table top can be designed in a targeted manner according to the impact energy of the impact table top, and the impact table top can be replaced. The top and bottom polyurethane springs may also be replaced with other flexible coupling materials of similar properties.
The bottom surface of the table body 210 is provided with a plurality of air springs 260, so that the workbench 200 can be free from foundation installation, meanwhile, the air springs 260 can jack up the table body 210 by inflating the air springs 260, on one hand, impact vibration of the table body to the ground can be buffered, and on the other hand, the sealing ring at the upper part of the workbench can be pressed on a through hole at the lower part of the climate experiment box, so that the sealing effect is achieved.
The long-pulse-width high-amplitude pneumatic impact and climate comprehensive environmental stress test device can generate half-sine impact with the pulse width of 0.5ms, the peak value of more than 10000g or half-sine impact with the pulse width of 1ms and the peak value of more than 5000g under the conditions of air pressure of 0.8MPa and impact table surface travel of 20 cm. The impact value is higher than that of a double-freedom-degree impact amplifier of a drop type impact test stand with the impact table surface stroke of 1.8 m. Because the stroke of the impact table top is shorter, the impact table top can be combined with a climate test box, and the test and real-time observation of the state through a wire in the experimental process are facilitated.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (2)
1. The long-pulse-width high-amplitude pneumatic impact and climate comprehensive environmental stress test device is characterized by comprising a climate experiment box and a workbench, wherein a working chamber is arranged in the climate experiment box, the top of the workbench penetrates through a through hole formed in the bottom surface of the climate experiment box to extend into the working chamber, and the workbench is in sealing connection with the bottom surface of the climate experiment box; the workbench is provided with a sealing ring, and the workbench is in sealing connection with the climate experiment box through the sealing ring;
The workbench comprises a workbench body and an impact table top, wherein an energy storage impact cylinder is arranged in the workbench body, a piston rod of the cylinder penetrates through the top surface of the workbench body, the impact table top is arranged at the top end of the piston rod, and a waveform generator is arranged on the top surface of the workbench body and is positioned right below the impact table top; a plurality of air springs are arranged on the bottom surface of the table body;
The center of the impact table top is provided with a mounting hole, a fastening bolt is inserted from the top of the mounting hole and penetrates out from the bottom, and the bottom end of the fastening bolt is in threaded connection with the top end of the piston rod; the fastening bolt is connected with the mounting hole through the top polyurethane spring, the mounting hole is connected with the cylinder piston rod through the bottom polyurethane spring, and a deformation space for accommodating and restraining radial deformation of the top polyurethane spring and the bottom polyurethane spring is reserved in the mounting hole.
2. The long pulse width high amplitude pneumatic impact and climate integrated environmental stress test device according to claim 1, wherein gaskets are installed at the upper and lower ends of the top polyurethane spring and the bottom polyurethane spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810433949.9A CN108593238B (en) | 2018-05-08 | 2018-05-08 | Long pulse width high amplitude pneumatic impact and climate comprehensive environmental stress test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810433949.9A CN108593238B (en) | 2018-05-08 | 2018-05-08 | Long pulse width high amplitude pneumatic impact and climate comprehensive environmental stress test device |
Publications (2)
| Publication Number | Publication Date |
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| CN108593238A CN108593238A (en) | 2018-09-28 |
| CN108593238B true CN108593238B (en) | 2024-06-21 |
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| CN201810433949.9A Active CN108593238B (en) | 2018-05-08 | 2018-05-08 | Long pulse width high amplitude pneumatic impact and climate comprehensive environmental stress test device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109238618B (en) * | 2018-10-10 | 2020-12-25 | 中南大学 | Cutter impact resistance characteristic testing arrangement |
| CN111879491A (en) * | 2020-08-18 | 2020-11-03 | 中机寰宇(山东)车辆认证检测有限公司 | Short-stroke half-sine wave impact test stand |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105509987A (en) * | 2015-12-31 | 2016-04-20 | 苏州东菱振动试验仪器有限公司 | Large-load high-g-value pneumatic vertical impact testbed |
| CN206496886U (en) * | 2017-02-14 | 2017-09-15 | 苏州熠品质量技术服务有限公司 | Medical sickbed simulating impact experimental rig |
| CN208043382U (en) * | 2018-05-08 | 2018-11-02 | 中北大学 | Long pulsewidth amplitude Pneumatic immpacting and weather synthetic chemistry laboratory experimental rig |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5489975B2 (en) * | 2010-12-17 | 2014-05-14 | 三菱重工業株式会社 | Impact test apparatus and impact test method |
| CN203664161U (en) * | 2013-11-20 | 2014-06-25 | 精量电子（深圳）有限公司 | Electric impact test bed |
| CN204575289U (en) * | 2015-04-27 | 2015-08-19 | 东莞市恒宇仪器有限公司 | Luggage vibration impact testing machine |
| CN105352694B (en) * | 2015-10-22 | 2018-03-09 | 海南大学 | A kind of impact test for simulating impact body power consumption is with dropping hammer |
| CN205262708U (en) * | 2015-12-11 | 2016-05-25 | 华测检测认证集团股份有限公司 | Multifunctional machinery impact testing device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105509987A (en) * | 2015-12-31 | 2016-04-20 | 苏州东菱振动试验仪器有限公司 | Large-load high-g-value pneumatic vertical impact testbed |
| CN206496886U (en) * | 2017-02-14 | 2017-09-15 | 苏州熠品质量技术服务有限公司 | Medical sickbed simulating impact experimental rig |
| CN208043382U (en) * | 2018-05-08 | 2018-11-02 | 中北大学 | Long pulsewidth amplitude Pneumatic immpacting and weather synthetic chemistry laboratory experimental rig |
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| CN108593238A (en) | 2018-09-28 |
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