CN108548645A - A kind of pneumatic vibration experimental rig and method - Google Patents

Abstract

The invention provides a pneumatic vibration test device and method, comprising a pneumatic vibrator for providing vibration air pressure for the test, the pneumatic vibrator is provided with an air intake part, and the air intake part is connected to an air supply device; a vibration table, Used to accommodate the test piece to be tested, the vibrating table is connected and fixed with the pneumatic vibrator, the vibration of the pneumatic vibrator is transmitted to the vibrating table, and then the vibrating table drives the test piece to vibrate; installation The support is used for installing and fixing the vibrating table. The invention is easy to install and disassemble, has a large controllable range of vibration frequency (range 0.1Hz-400Hz) and amplitude (range 0-5mm), can be used repeatedly and has low cost.

Description

A kind of pneumatic vibration test device and method

technical field

The present invention relates to a vibration test device and method, in particular to a test device and method which are generated by air flow and can provide a relatively large range of controllable vibration frequency and vibration amplitude.

Background technique

Existing vibration test benches are divided into electric vibration test benches, mechanical vibration test benches and hydraulic vibration test benches. The mechanical vibration table belongs to the low-frequency large-load vibration test bench, the frequency is 5-80Hz, the load is from 50Kg-1000Kg, the displacement is about 5mm, and the acceleration is 3-20g; it is suitable for low-frequency experiments, and the frequency does not meet the requirements. The electrodynamic vibration test bench is a high-frequency, large displacement, and large thrust vibration test bench. The frequency range is 5 to 3000 Hz, and the displacement can reach 25.4mm. , due to the large structure of the vibrating table and the small table top, it is very inconvenient to introduce and install additional testing equipment, and the price of the vibrating table is expensive. The frequency range of the hydraulic vibration test bench is 0.1-50Hz, the maximum amplitude is 40mm, and the thrust is 3000kg. It is suitable for vibration at low frequencies. Since the test bench adopts a hydraulic structure, the size of the equipment is too large and the price is expensive. The introduction and installation of detection equipment is very inconvenient.

After searching the prior art documents and patents, it was found that:

Chinese patent number: CN 102927248 A, patent name: Vibration test bench and its driving device. The technology disclosed in this invention is: a vibration test bench, including a lifting device and a driving device connected to the lifting device, the driving device includes a gearbox, and the gearbox is provided with an input shaft and a transmission shaft The output shaft is drive-connected with the input shaft, and the transmission shaft is provided with a plurality of gear clutch assemblies, and the drive device also includes a controller for controlling one of the gear clutch assemblies to be in a suction state, and the gear clutch assemblies It includes a clutch and a transmission gear fixed on the suction body of the clutch, the housing of the clutch rotates coaxially with the transmission shaft, and the transmission gear is in clearance fit with the transmission shaft. Its shortcomings are: 1) the structure of the test bench is complicated (including large parts such as gearboxes and clutches), the cost is high, and the equipment occupies a large area; 2) the operation of the test bench is complicated and inconvenient to carry; 3) the processing method High energy consumption and high cost.

Chinese patent number: CN 203024951 U, patent name: a vibration test bench. The technology disclosed in this invention is: a vibration test bench, including a frame, a vibration platform, and a support guide column assembly connected to the frame and the vibration platform, and also includes an auxiliary guide column connected to the vibration platform And an auxiliary guide sleeve arranged on the frame, the auxiliary guide post is sleeved in the auxiliary guide sleeve. Its shortcomings are: 1) the test bench and its external power device are complex and costly; 2) the vibration frequency of the test bench is low, and it is mostly used to simulate the low-frequency vibration environment of some products during transportation, and is used to test automobiles, The shock resistance of product structures such as toys, furniture, and packaging; 3) the processing method consumes a lot of energy.

In small-scale vibration tests, such as sediment vibration rheology, vibration rheology of other materials, chip welding vibration tests, etc., the general experimental conditions have the following characteristics: the number of times the test is used is limited, and the mechanical parameters during the vibration process need to be measured in real time , need vibration equipment and testing equipment to be easily disassembled, etc., but the existing vibration equipment is large in size and complex in structure, making it inconvenient to install mechanical and other external testing equipment, so the test of relevant parameters is mostly to take down the test sample after vibration and install it in the Testing with external testing equipment cannot reflect the impact of vibration on the sample in real time. This problem is particularly prominent in the field of rheology, and vibration equipment is expensive.

Contents of the invention

In view of the defects in the prior art, the object of the present invention is to provide an aerodynamic vibration test device and method which can be easily installed and can realize real-time measurement of vibration effects. The vibration effect is obvious, and it is especially suitable for vibration tests in the field of rheology.

According to the first object of the present invention, a kind of pneumatic vibration test device is provided, said device comprises:

The pneumatic vibrator is used to provide the vibration air pressure for the test; the pneumatic vibrator is provided with an air intake part, and the air intake part is connected to the air supply equipment;

A vibrating table, used to accommodate the test piece to be tested, the vibrating table is connected and fixed with the pneumatic vibrator, the vibration of the pneumatic vibrator is transmitted to the vibrating table, and then the testing piece is driven by the vibrating table vibration;

The installation support is used for installing and fixing the vibrating table.

Preferably, the pneumatic vibrator and the vibrating table are connected by threads and transmit vibrations.

Preferably, the vibrating table is connected to the installation support through a shock-absorbing connector, which is used to support the vibrating table on the one hand, and to reduce the impact of vibration on the The impact of the bearing.

Preferably, the installation support includes a base, a horizontal plate and a vertical plate arranged above the base, and the vertical plate is arranged above one end of the horizontal plate for installing the vibrating table; the other side of the horizontal plate One end is fixed to the base.

More preferably, the base is provided with mounting holes for mounting on the experimental platform by mounting clamping screws.

More preferably, the mounting support is welded by stainless steel plates, and reinforcing ribs are partially welded at the vertical plate to prevent fractures caused by stress concentration at the right angle between the vertical plate and the horizontal plate.

Preferably, the air intake component is connected to the gas supply equipment through a conversion joint and a tie to prevent leakage of high-pressure gas.

Preferably, the pneumatic vibrator is a turbo type pneumatic vibrator. The turbine-type pneumatic vibrator uses the air pressure of the air intake part to make the eccentric turbine inside rotate at a high speed on the track to generate a high-power centrifugal force, provide a certain amplitude and frequency, and change the connected air supply equipment (such as air compression) machine) to output the pressure of the air pressure and the size of the pneumatic vibrator to change the frequency and amplitude of the vibrating table.

Preferably, the vibrating table is in the shape of a box for accommodating the test piece to be tested, with an open top and a closed bottom.

Preferably, the device further includes a vibration tester, the vibration tester is installed on the side of the vibration table, used to collect the vibration amplitude and frequency of the vibration table, as a means of regulating the air pressure of the pneumatic vibrator in accordance with.

The device of the present invention is different from the existing vibration providing methods (electromagnetic, hydraulic, mechanical), and creatively uses air pressure and pneumatic vibrators to provide high-frequency and high-amplitude vibrations, and the frequency and amplitude adjustment range is large (the maximum value depends on the inlet air pressure and vibration parameters), it can be measured with vibration, and the installation and disassembly of vibration experiments are convenient.

The device of the invention adopts the inlet air pressure and replaces the existing vibrator to control the vibration frequency, and the vibration amplitude is determined by the provided acceleration amplitude and frequency. The vibration generated by the pneumatic vibrator is transmitted to the vibrating table through the threaded connection, so that the test piece in the vibrating table vibrates at a specified frequency. The pneumatic vibrator is generated by the centrifugal force caused by the imbalance of the positive and negative torque of the rotor. It has the characteristics of instant start and stop, free installation in space, high service life, low gas consumption, safety, energy saving, small size, few failures, easy installation and maintenance, etc.

According to the second object of the present invention, there is provided an aerodynamic vibration test method using the above device. Specifically, the method includes:

Fix the mounting support on the experimental platform, and put the test piece to be tested into the vibration table;

Turn on the vibration tester;

Connect the pneumatic vibrator to the air supply equipment, turn on the air supply equipment, supply low air pressure, and check the airtightness of the connecting pipeline;

According to the frequency and amplitude read by the vibration tester, the air pressure is gradually and slowly adjusted within the range below the allowable air pressure of the vibration table and the required maximum air pressure;

Turn off the gas supply equipment and test the test piece to be tested.

Compared with the prior art, the present invention has the following beneficial effects:

The present invention adopts the existing pneumatic vibrator to provide the vibration required for the experiment, and ingeniously designs a vibration test bench which is convenient for installation and operation. , low gas consumption, safety, energy saving, small size, few faults, easy installation and maintenance, cheap cost, the vibration effect of the equipment is obvious and stable through the indoor model test.

The present invention can adapt to the installation requirements of different additional vibration dynamic test equipment, effectively integrate the mechanical measurement equipment with the vibration test bench, be easy to install and disassemble, and achieve multiple functions such as high efficiency, economy, energy saving and safety.

Description of drawings

Other characteristics, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

Fig. 1 is the device structural representation of a preferred embodiment of the present invention;

In the figure: intake pipe 1, pneumatic vibrator 2, vibration table 3, shock absorber 4, mounting support 5, mounting clamping screw 6, vibration tester 7.

Detailed ways

The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

As shown in Fig. 1, a kind of preferred embodiment structure diagram of pneumatic vibration test device, comprises:

Pneumatic vibrator 2 is used to provide vibration air pressure for testing; the pneumatic vibrator is provided with air intake components, and the air intake components are connected to air supply equipment;

The vibrating table 3 is used to accommodate the test piece to be tested. The vibrating table 3 is connected and fixed with the pneumatic vibrator 2. The vibration of the pneumatic vibrator 2 is transmitted to the vibrating table 3, and then the vibrating table 3 drive the test piece to vibrate;

The installation support 5 is used to install and fix the vibrating table 3, so as to fix the vibrating table 3 and the pneumatic vibrator 2 during the experiment.

In order to better understand the present invention, the following will be described in conjunction with application examples to understand implementation details, but the following examples are not intended to limit the present invention.

For viscous mud with a median particle size d50 of 19.49 μm and a water content of 51.04%, the vibration test of the sand is carried out by using the pneumatic vibration test bench of the present invention which is convenient for installation and can realize real-time measurement of vibration effects.

Specifically, as shown in Figure 1, the pneumatic vibration test device includes an air intake pipe 1, a pneumatic vibrator 2, a vibration table 3, a shock absorber 4, a mounting support 5, a mounting clamping screw 6, and a vibration tester 7. , wherein: the air intake pipe 1 of the pneumatic vibrator 2 is connected to an air supply device (such as an air compressor), and the air intake pipe 1 and the pneumatic vibrator 2 are tightened with a tie to prevent high-pressure gas from leaking. Vibration is transmitted between the pneumatic vibrator 2 and the vibrating table 3 through a threaded connection. The shock absorber 4 is connected between the vibrating table 3 and the mounting support 5, wherein the shock absorber 4 is used to support the vibrating table 3 on the one hand, and is used to reduce the impact of vibration on the mounting support 5 on the other hand. The clamping screw 6 is installed to fix the base of the mounting support 5 on the experimental table. The vibration tester 7 is used to test the vibration amplitude and frequency of the vibration table 3 as an important index for regulating the inlet air pressure.

In some embodiments of the present invention, the air inlet pipe 1 adopts a common pressure-resistant plastic hose to deliver high-pressure gas to the air inlet of the vibrating table. In this embodiment, the inner diameter of the inlet pipe 1 is 8 mm, and the air compressor at one end of the inlet pipe has a discharge capacity of 0.3 m ³ /min. It is equipped with a pressure gauge to record the air pressure of the exhaust gas.

In some embodiments of the present invention, the pneumatic vibrator 2 is a turbo type pneumatic vibrator. In this embodiment, the pneumatic vibrator 2 is a turbine-type GT10 pneumatic vibrator with a size of 86 mm long × 50 mm high and a centrifugal force of 850-2450 N. The air inlet is connected to the air inlet pipe 1 through a threaded joint. The helical gear structure of the turbine, when compressed air enters, causes the gear to rotate rapidly, driving the shaft to collide with the inner wall, resulting in severe vibration.

In some embodiments of the present invention, the vibrating table 3 is in the shape of a box for accommodating the test piece to be tested, with an open top and a closed bottom. In this embodiment, the vibrating table 3 is made of a stainless steel plate with a thickness of 3 mm. The overall size of the vibrating table 3 is 88 mm long x 88 mm wide x 90 mm high, and is used to install and hold the test piece to be tested with vibration detection. .

In some embodiments of the present invention, the shock absorber 4 adopts a rubber shock absorber, and the rubber shock absorber is threadedly connected to the vibrating table and the mounting seat. seat impact. In this embodiment, the size of the rubber shock absorber is M3×8; D8×H8, M on the size: represents the diameter of the screw; D: represents the diameter of the rubber; H on the size: represents the height of the rubber; 4 shock absorbers are used to support the vibrating table 3. On the other hand, it is used to reduce the impact of vibration on the mounting bracket 5.

In some embodiments of the present invention, the installation support 5 includes a base 501, a horizontal plate 502 and a vertical plate 503 arranged above the base, and the vertical plate 503 is arranged above one end of the horizontal plate 502 for mounting The vibrating table 3 ; the other end of the horizontal plate 502 is fixed on the base 501 . The base 501 is provided with installation holes for installing on the experimental platform by installing clamping screws 6 . In this embodiment, the mounting support 5 is welded by four stainless steel plates with a thickness of 5mm, and the vertical plate 503 is partially welded with reinforcing ribs to prevent the right angle between the vertical plate 503 and the horizontal plate 502. Stress concentration leads to fracture, and three threaded through holes with a diameter of 8 mm are processed on the support for connecting the mounting and clamping screws 6 .

In some embodiments of the present invention, the vibration tester 7 adopts a ranging laser displacement sensor and is installed on the side of the vibration table for collecting the vibration amplitude and frequency of the vibration table 3, so as to facilitate real-time adjustment of the intake pressure . In this embodiment, the vibration tester 7 adopts the HG-C1050 ranging laser displacement sensor of Panasonic God Vision, its power supply voltage is 12-24V, the test accuracy is 1/100mm, and the output voltage is converted into the corresponding displacement , and measure the amplitude and frequency as the basis for regulating the intake air pressure of the pneumatic vibrator.

In this embodiment, the mounting clamping screw 6 is a thumb screw with a size of M8×110 (head 30mm), which is used to fix the base of the mounting support 5 on the experimental table or other experimental platforms.

The above is the preferred structural design in the present invention, of course, in other embodiments, the above-mentioned components may also have other structures. Each of the above preferred structures can be used alone, or in any combination on the premise of not conflicting with each other, and the effect will be better when used in combination. Of course, the shock absorber 4 in the above embodiment can also be omitted, but the effect is slightly worse, but the purpose of the present invention can be achieved equally.

Utilize above-mentioned device, the present invention also provides a kind of aerodynamic vibration test method, in conjunction with the preferred embodiment of above-mentioned device, the implementation process of this method comprises:

The method comprises the steps of:

①Put the bottom of the mounting base against the back of the experimental table, and manually tighten the mounting clamping screws until the mounting base is firmly clamped on the experimental desktop.

② Turn on the vibration tester.

③Connect the air intake pipeline to the air inlet, and at the same time tighten the adapter between the air inlet pipe and the air inlet with a tie to prevent the air inlet pipe from detaching from the vibrating table when high-pressure air enters the vibrating table. Turn on the air compressor, supply a lower air pressure (far below the safe air pressure), and check the airtightness of the connecting pipeline.

④According to the frequency and amplitude read by the vibration tester, adjust the air pressure gradually and slowly within the range below the allowable air pressure of the vibration table and the required maximum air pressure.

⑤ Turn off the air compressor and test the test piece to be tested.

The invention is easy to install and disassemble, has a large controllable range of vibration frequency (range 0.1Hz-400Hz) and amplitude (range 0-5mm), can be used repeatedly and has low cost.

The device of the present invention can measure with vibration, start and stop instantaneously, can be installed in any space, has high service life, low gas consumption, safety, energy saving, small volume, few faults, simple installation and maintenance, and low cost. The vibration effect is obvious and the vibration is stable.

In the drawings, the same reference numerals represent the same parts or parts with equivalent functions, for the purpose of conveniently describing the present invention. All accompanying drawings are only for the convenience of explaining the technical content of the present invention; The technical features such as the number, the position of parts, the mutual relationship between parts and the size of parts that constitute the best implementation mode do not constitute technical solutions. It should not be limited by itself, but should extend to the entire field covered by this technical field.

The embodiments described above by referring to the figures are exemplary, and are intended to explain the present invention, and should not be construed as limiting the present invention. In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " The orientation or positional relationship indicated by "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientation or position shown in the drawings The positional relationship is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention.

Claims (10)

1. A pneumatic vibration test device, characterized in that: comprising: The pneumatic vibrator is used to provide the vibration air pressure for the test; the pneumatic vibrator is provided with an air intake part, and the air intake part is connected to the air supply equipment; A vibrating table, used to accommodate the test piece to be tested, the vibrating table is connected and fixed with the pneumatic vibrator, the vibration of the pneumatic vibrator is transmitted to the vibrating table, and then the testing piece is driven by the vibrating table vibration; The installation support is used for installing and fixing the vibrating table. 2. The pneumatic vibration test device according to claim 1, characterized in that: said pneumatic vibrator is connected to said vibrating table through threads to transmit vibration. 3. The pneumatic vibration test device according to claim 1, characterized in that: the vibrating table and the mounting support are connected by a shock-absorbing connector, and the shock-absorbing connector is used to support the The vibrating table, on the other hand, is used to reduce the impact of vibration on the mounting support. 4. The pneumatic vibration test device according to claim 1, characterized in that: the mounting support includes a base, a horizontal plate and a vertical plate arranged above the base, and the vertical plate is arranged above one end of the horizontal plate , for installing the vibrating table; the other end of the horizontal plate is fixed on the base. 5 . The pneumatic vibration test device according to claim 4 , characterized in that: the base is provided with installation holes, and the installation holes are used for installing clamping screws so that the base is installed on the experimental platform. 6 . 6. The pneumatic vibration test device according to claim 5, characterized in that: the mounting support is welded by stainless steel plates, and reinforcing ribs are locally welded at the vertical plate to prevent the vertical plate and the horizontal plate from Stress concentrations at the right angles of the connection lead to fracture. 7. The pneumatic vibration test device according to claim 1, characterized in that: the air intake component is connected to the gas supply equipment through a conversion joint and a tie to prevent leakage of high-pressure gas. 8. The pneumatic vibration test device according to claim 1, characterized in that: the vibration table is in the shape of a box for accommodating the test piece to be tested, with an open top and a closed bottom. 9. The pneumatic vibration test device according to any one of claims 1-8, characterized in that: the device further comprises a vibration tester, and the vibration tester is installed on the side of the vibration table for collecting the The vibration amplitude and frequency of the vibrating table are used as the basis for regulating the intake air pressure of the pneumatic vibrator. 10. An aerodynamic vibration test method using the device according to any one of claims 1-9, characterized in that: comprising: Fix the mounting support on the experimental platform, and put the test piece to be tested into the vibration table; Turn on the vibration tester; Connect the pneumatic vibrator to the air supply equipment, turn on the air supply equipment, supply low air pressure, and check the airtightness of the connecting pipeline; According to the frequency and amplitude read by the vibration tester, the air pressure is gradually and slowly adjusted within the range below the allowable air pressure of the vibration table and the required maximum air pressure; Turn off the gas supply equipment and test the test piece to be tested.