CN108593238A - Long pulsewidth amplitude Pneumatic immpacting and weather synthetic chemistry laboratory experimental rig - Google Patents

Abstract

The invention discloses a long-pulse width and high-amplitude aerodynamic impact and climate comprehensive environmental stress test device, which relates to the technical field of aerodynamic impact equipment, including a climate test box and a workbench, and the impact surface on the top of the workbench passes through the bottom of the climate test box. The through hole extends into the working room of the climate experiment box. The workbench includes a table body and an impact table surface. The piston rod of the energy storage impact cylinder inside the table body passes through the top surface of the table body. A waveform generator is installed on the top surface of the impact table, which is located directly below the impact table surface. The polyurethane spring is used for flexible connection between the piston rod and the impact table surface. The invention makes the high-frequency The impact vibration is effectively absorbed, and at the same time, the impact peak value is significantly enlarged, and the impact pulse width is expanded. Under the condition of specified impact energy, the design stroke of the impact table surface can be shortened, and the volume of the workbench is reduced, so that it can be combined with the climate test box. .

Description

Long pulse width and high amplitude aerodynamic shock and climate comprehensive environmental stress test device

technical field

The invention relates to the technical field of aerodynamic shock equipment, in particular to multi-environmental stress simulation tests, environmental tests, and reliability enhancement test devices that combine long-pulse width and high-amplitude aerodynamic shocks with climate and environmental stress.

Background technique

The current three-comprehensive test chamber can simultaneously simulate high and low temperature damp heat, vibration environmental stress and small-scale mechanical impact stress by combining the climate test chamber and the mechanical vibration table, but the mechanical shock stress excited by the mechanical vibration table is at most about 100g, far It is less than the impact acceleration generated during the falling of the equipment and the firing of the ammunition. However, equipment that produces high mechanical impact stress, such as air cannons, free-fall drop tables, and rotary arm high-acceleration centrifuges, occupies a large area, and is often accompanied by the structural characteristics of the long stroke of the impact hammer or the large movable radius of the rotary arm, making high Mechanical shock is difficult to combine with climate test chamber.

However, the mechanical impact energy of the shock wave generator driven by the energy storage impact cylinder is insufficient, and it is difficult to achieve a long pulse width and high acceleration impact. Usually, a half sine wave mechanical impact with a pulse width of 1ms is generated, and the peak value of the acceleration is less than 3000g, and the impact During the impact process, the impact table is prone to high-frequency impact response, and the impact clutter is relatively large; in addition, the piston rod and the impact table are rigidly connected by fastening bolts. During the impact process, the fastening bolts are not strong enough to deform and break, causing Security risks.

Contents of the invention

The embodiment of the present invention provides a long-pulse width and high-amplitude aerodynamic shock and climate comprehensive environmental stress test device, which can solve the problems existing in the prior art.

The invention provides a long-pulse width, high-amplitude aerodynamic shock and climate comprehensive environmental stress test device, the test device includes a climate test box and a workbench, the inside of the climate test box has a working room, and the top of the workbench passes through The through hole provided on the bottom surface of the climate test box extends into the working room, and the workbench and the bottom surface of the climate test box are sealed and connected;

The workbench includes a table body and an impact table. The table body has an energy storage impact cylinder inside, and the piston rod of the cylinder passes through the top surface of the table body. The impact table is installed on the top end of the piston rod. A waveform generator is installed on the top surface of the table body, and the waveform generator is located directly below the impact table;

A mounting hole is opened in the center of the impact table, and a fastening bolt is inserted from the top of the mounting hole and passed out from the bottom, and the bottom end of the fastening bolt is screwed to the top of the piston rod; the fastening bolt The top polyurethane spring is used to connect with the installation hole, and the bottom polyurethane spring is used to connect the installation hole and the cylinder piston rod.

Preferably, a seal ring is installed on the workbench, and the workbench is sealed and connected with the climate experiment box through the seal ring.

Preferably, deformation spaces for accommodating and constraining radial deformation of the top and bottom polyurethane springs are reserved in the installation holes.

Preferably, a plurality of air springs are installed on the bottom surface of the platform.

Preferably, gaskets are installed at the upper and lower ends of the top polyurethane spring and the bottom polyurethane spring.

The long-pulse-width high-amplitude aerodynamic shock and climate comprehensive environmental stress test device in the embodiment of the present invention includes a climate test box and a workbench. In the working room of the box, the workbench includes a table body and an impact table. The piston rod of the energy storage impact cylinder inside the table body passes through the top surface of the table body. The impact table is installed on the top, and a waveform generator is installed on the top surface of the table body , which is located directly below the impact table, and the polyurethane spring flexible connection is used between the piston rod and the impact table. The present invention effectively absorbs high-frequency vibrations through the flexible connection between the impact table and the piston rod, and at the same time significantly amplifies the impact peak value. The impact pulse width is expanded, and the design stroke of the impact table can be shortened under the specified impact energy conditions, and the volume of the workbench is greatly reduced, so that it can be combined with the climate test box to complete the impact test under various temperature and air pressure conditions.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural view of a long-pulse-width high-amplitude aerodynamic shock and climate comprehensive environmental stress test device provided by an embodiment of the present invention;

Fig. 2 is the longitudinal sectional structure schematic diagram of test device among Fig. 1;

Fig. 3 is a state diagram of the workbench in Fig. 1 before the collision;

Fig. 4 is a state diagram of the workbench in Fig. 3 after collision;

Fig. 5 is a schematic diagram of the longitudinal section structure of the impact table in Fig. 3;

Fig. 6 is the impact waveform of the rigid connection between the cylinder piston rod and the impact table;

Figure 7 is the impact waveform of the flexible connection between the cylinder piston rod and the impact table.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

With reference to Fig. 1 and Fig. 2, long-pulse-width high-amplitude aerodynamic shock and climate comprehensive environmental stress test device are provided in the embodiment of the present invention, and this test device comprises climate experiment box 100 and workbench 200, and described climate experiment box 100 interior There is a working room 110, the top of the workbench 200 extends into the working room 110 through the through hole provided on the bottom surface of the climate test box 100, and the bottom surface of the workbench 200 and the climate test box 100 Sealed connection between.

3, 4 and 5, the worktable 200 includes a table body 210 and an impact table 230, the table body 210 has an energy storage impact cylinder (not shown), the piston rod 220 of the cylinder passes through the The top surface of the table body 220 , the impact table 230 is installed on the top of the piston rod 220 , and the object 300 to be tested is fixed on the top surface of the impact table 230 . As shown in Figure 5, the center of the impact table 230 is provided with a mounting hole, the fastening bolt 221 is inserted from the top of the mounting hole and passed out from the bottom, and the bottom end of the fastening bolt 221 is screwed on the piston. the top of the rod 220. The nuts of the fastening bolts 221 and the mounting holes are connected together using a top polyurethane spring 222 , and the mounting holes and the cylinder piston rod 220 are connected together using a bottom polyurethane spring 223 . In this embodiment, spacers 224 are installed at 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 the impact process, and the diameter in the radial direction also becomes larger, a deformation space 225 is reserved in the installation hole. After the impact is over, the top polyurethane spring 222 and the bottom polyurethane spring 223 will automatically return to their original shape when the cylinder air pressure is removed.

The radial deformation space of the bottom polyurethane spring 223 reserved in the mounting hole at the bottom of the impact table 230 is relatively small. During the installation and pre-tightening process of fixing the impact table to the piston rod with fastening bolts 221, the bottom polyurethane spring 223 is Axially compressed and radially elongated to fill the remaining space of the entire installation hole, the bottom polyurethane spring 223 can enhance the connection strength of the fastening bolt 221, reduce the high-frequency response of the impact table 230, and play a high role in the mechanical impact waveform frequency filtering.

A waveform generator 240 is installed on the top surface of the table body 210. The waveform generator 240 is located directly below the impact table 230, and a layer of sealing ring 250 is installed on the waveform generator 240. The workbench 200 The sealing ring 250 is hermetically connected with the climate experiment box 100 .

Based on the above structure, the two polyurethane springs buffer the fastening bolts during the impact, prolong the impact time, and increase the impact energy by more than 2 times. The hardness and damping of the two polyurethane springs are designed according to the quality and impact strength of the impact table 230, so that it can generate large longitudinal compression during the impact of long pulse and high peak acceleration, while absorbing high-frequency vibration and suppressing impact clutter .

If no flexible connection is used, the impact table 230 will be locked on the waveform generator 240 by the air pressure after the collision, which will reduce the rebound velocity and impact acceleration, and also easily cause shock. The waveform generated by the collision is shown in Figure 6 Show. In the present invention, through the flexible connection design of the polyurethane spring between the piston rod 220 and the impact table 230, the impact table 230 produces a relatively large rebound velocity and impact acceleration after colliding with the waveform generator 240, and the waveform generated by the collision is shown in FIG. 7 .

Due to the huge impact force during the impact process, it is required that the impact table 230 should be designed for lightweight, strength design and frequency response analysis. Through the design of the impact table 230, the diameter of the impact table 230 is not less than 80 mm, and the mass is not more than 1.5 kg, and the frequency response is 1-10 KHz, and it is resistant to 30,000 g mechanical impact, and is easy to process.

The piston rod 220, the impact table 230 and its connectors, the top polyurethane spring 222, the bottom polyurethane spring 223, and the sealing ring 250 are made of high and low temperature resistant materials or have high and low temperature resistance characteristics, so that they can withstand temperatures of -70°C to 150°C. Conduct experiments to assess the impact resistance of the tested product under high and low temperature conditions. At the same time, the top and bottom polyurethane springs have the characteristics of high strength, high elasticity, and excellent shock absorption performance. According to the impact energy of the impact table, its structure, hardness, high and low temperature characteristics can be designed in a targeted manner, and it can be replaced. The top and bottom urethane springs can also be replaced with other flexible coupling materials of similar performance.

A plurality of air springs 260 are installed on the bottom surface of the table body 210, so that the workbench 200 can be exempted from foundation installation, and at the same time, by inflating the air springs 260, the air springs 260 can lift the table body 210, which can buffer the table body on the one hand. On the other hand, the impact vibration to the ground can be used to make the sealing ring on the upper part of the worktable be pressed against the through hole on the lower part of the climate test box to achieve the effect of sealing.

The long-pulse width and high-amplitude aerodynamic impact and climate comprehensive environmental stress test device in the present invention can produce a half-sine impact with a pulse width of 0.5ms and a peak value greater than 10000g under the conditions of an air pressure of 0.8MPa and an impact table stroke of 20cm, or a pulse width of 1ms. Half-sine shock with a peak value greater than 5000g. The impact value is higher than the impact value produced by the two-degree-of-freedom impact amplifier of the drop-type impact test bench with a stroke of 1.8m. Due to the short stroke of the impact table, it can be combined with the climate test chamber, and it is convenient to test the wire and observe the state in real time during the experiment.

While preferred embodiments of the invention have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, it is intended that the appended claims be construed to cover the preferred embodiment as well as all changes and modifications which fall within the scope of the invention.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (5)

1. long pulsewidth amplitude Pneumatic immpacting and weather synthetic chemistry laboratory experimental rig, which is characterized in that the experimental rig Including Climatic Effects case and workbench, there is operating room, the top of the workbench is across described inside the Climatic Effects case The through-hole opened up on Climatic Effects bottom face is extend into the operating room, and the bottom surface of the workbench and weather experimental box it Between be tightly connected；

The workbench includes stage body and impact table top, has accumulation of energy blow cylinder, the piston rod of the cylinder inside the stage body Across the top surface of the stage body, the impact table top is mounted on the top of the piston rod, is equipped on the top surface of the stage body Waveform generator, the waveform generator are located at the underface of the impact table top；

The center of the impact table top offers mounting hole, and fastening bolt is inserted into from the top of the mounting hole, is pierced by from bottom, institute The bottom end for stating fastening bolt is screwed onto the top of the piston rod；It is poly- at the top of use between the fastening bolt and the mounting hole Urethane spring links together, and one is connected to using bottom polyurethane spring between the mounting hole and the cylinder piston rod It rises.

2. long pulsewidth amplitude Pneumatic immpacting as described in claim 1 and weather synthetic chemistry laboratory experimental rig, feature It is, sealing ring is equipped on the workbench, and the workbench is tightly connected by the sealing ring and the Climatic Effects case.

3. long pulsewidth amplitude Pneumatic immpacting as described in claim 1 and weather synthetic chemistry laboratory experimental rig, feature It is, the deformation being reserved in the mounting hole for storing and constraining the top and bottom polyurethane spring radial direction deformation is empty Between.

4. long pulsewidth amplitude Pneumatic immpacting as described in claim 1 and weather synthetic chemistry laboratory experimental rig, feature It is, multiple air springs is installed on the bottom surface of the stage body.

5. long pulsewidth amplitude Pneumatic immpacting as described in claim 1 and weather synthetic chemistry laboratory experimental rig, feature It is, the upper and lower ends of the top polyurethane spring and bottom polyurethane spring are mounted on gasket.