Horizontal low-pressure vibration testing apparatus and method

Abstract

Provided is a horizontal low-pressure vibration testing apparatus, comprising a negative pressure testing chamber (1), a vacuum vibration test shaker (2), and a control unit, wherein the negative pressure testing chamber (1) comprises a negative pressure chamber body (11), and a first vacuum pump configured for forming negative pressure within the negative pressure chamber body (11); the vacuum vibration test shaker (2) comprises a shaker body (21), a moving coil (22) connected to the shaker body (21) to output vibration, a second vacuum pump connected to the shaker body (21), a high-pressure air source connected to the shaker body (21), and a displacement sensor configured for detecting the position of the moving coil (22). The shaker body (21) is arranged adjacent to the negative pressure testing chamber (1) in the horizontal direction. The horizontal low-pressure vibration testing apparatus and method provide a displacement sensor to detect the position of the moving coil (22) and then control the air pressure within the shaker body (21) based on a detection result. This balances the moving coil (22), thereby improving vibration testing precision and preventing test errors due to oscillation of the moving coil (22).

Description

Horizontal low-pressure vibration test apparatus and method

[0001] This application is based on and claims priority to Chinese Patent Application No. 202410508570.5, filed on April 25, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to a horizontal low-pressure vibration testing device and method. Background Technology

[0003] Vibration testing is a common testing method, but sometimes it is necessary to provide a sealed chamber to simulate actual working conditions and create a low-pressure environment inside the sealed chamber so that the vibration test can be carried out in a low-pressure environment.

[0004] However, a negative pressure environment can easily cause the moving coil to shift towards the sealing chamber, thus affecting the test results. Existing technologies include evacuating the vibration table to maintain the sealing ring's position, but there is no clear solution for ensuring pressure balance between the vibration table and the sealing chamber. Measuring the pressure on both sides is an obvious approach, but a pressure difference doesn't necessarily cause the moving coil to shift. Furthermore, frequent inflation and deflation to ensure pressure balance is both energy-intensive and unnecessary.

[0005] In view of this, it is necessary to improve the existing horizontal low-pressure vibration test equipment to solve the above problems.

[0006] Any prior art mentioned in the specification does not imply confirmation or suggestion that such prior art constitutes part of the general common knowledge in any jurisdiction, or that it can be reasonably expected that such prior art will be understood, regarded as relevant and / or combined with other prior art by a person skilled in the art.

[0007] Application content

[0008] The purpose of this application is to provide a horizontal low-pressure vibration testing device to solve the problem that existing low-pressure vibration testing devices are unable to maintain the positional balance of the moving coil.

[0009] To achieve one of the above-mentioned objectives, this application provides a horizontal low-pressure vibration testing device, which includes a negative pressure test chamber, a vacuum vibration test bench, and a control unit. The negative pressure test chamber includes a negative pressure chamber body and a first vacuum pump for creating a negative pressure inside the negative pressure chamber body. The vacuum vibration test bench includes a vibration table body, a moving coil connected to the vibration table body for outputting vibration, a second vacuum pump connected to the vibration table body, a high-pressure gas source connected to the vibration table body, and a displacement sensor for detecting the position of the moving coil. The vibration table body is arranged adjacent to the negative pressure test chamber in the horizontal direction.

[0010] As a further improvement to the embodiments of this application, the horizontal low-pressure vibration test device further includes a vacuum solenoid valve connecting the second vacuum pump and the vibration table body, and a gas source solenoid valve connecting the high-pressure gas source and the vibration table body.

[0011] As a further improvement to the embodiments of this application, both the vacuum solenoid valve and the gas source solenoid valve are proportional solenoid valves.

[0012] As a further improvement to the embodiments of this application, the negative pressure test chamber further includes a back pressure solenoid valve and a negative pressure solenoid valve. The back pressure solenoid valve is used to connect the negative pressure chamber body and the external air, and the negative pressure solenoid valve is used to control the on / off state of the first vacuum pump.

[0013] As a further improvement to the embodiments of this application, the horizontal low-pressure vibration test device further includes a support platform protruding from the bottom wall into the negative pressure chamber, a specimen mounting surface disposed on the support platform, and a connector connecting the specimen mounting surface and the moving coil, wherein the specimen mounting surface is slidably disposed relative to the support platform.

[0014] This application also provides a method for testing horizontal low-pressure vibration, the method comprising the following steps:

[0015] S1: Provide a horizontal low-pressure vibration test device as described above, place the specimen on the specimen mounting platform, and use a displacement sensor to detect the initial position of the moving coil;

[0016] S2: Start the first vacuum pump to create negative pressure in the negative pressure test chamber, and start the second vacuum pump to create negative pressure in the vibration table body, so that the position of the moving coil is stable;

[0017] S3: Start the vacuum vibration test bench to make the specimen vibrate on the specimen mounting platform;

[0018] S4: The displacement sensor detects the position of the moving coil and controls one of the vacuum solenoid valve and the gas source solenoid valve to open or both to close based on the position of the moving coil;

[0019] S5: Complete the experiment and remove the specimen.

[0020] As a further improvement to the implementation of this application, in step S4, the opening and closing status of the vacuum solenoid valve and the gas source solenoid valve specifically includes: when the position of the moving coil is stable, both the vacuum solenoid valve and the gas source solenoid valve are controlled to be closed; when the moving coil moves toward the negative pressure test chamber, the vacuum solenoid valve is controlled to be opened until the moving coil returns to its initial position; when the moving coil moves away from the negative pressure test chamber, the gas source solenoid valve is controlled to be opened until the moving coil returns to its initial position.

[0021] As a further improvement to the embodiments of this application, the control unit stores a moving coil position range threshold. When the displacement sensor detects that the moving coil has deviated from the range threshold, it controls one of the vacuum solenoid valve and the gas source solenoid valve to open or both to close.

[0022] As a further improvement to the implementation of this application, in step S4, the balance of the moving coil is maintained by adjusting the opening time ratio of the vacuum solenoid valve and the gas source solenoid valve, and the opening time ratio increases with the increase of time.

[0023] As a further improvement to the implementation of this application, in step S5, after the experiment is completed, the negative pressure solenoid valve is closed, the back pressure solenoid valve is opened, the vacuum solenoid valve is closed, and the air source solenoid valve is opened. While increasing the air pressure in the negative pressure test chamber, the moving coil is kept in balance until the negative pressure test chamber reaches normal pressure. After closing the back pressure solenoid valve and the air source solenoid valve, the test piece is taken out.

[0024] As a further improvement to the implementation of this application, in step S5, the moving coil is kept balanced by adjusting the opening time ratio of the gas source solenoid valve.

[0025] Compared with the prior art, the beneficial effects of this application are as follows: The horizontal low-pressure vibration test apparatus and method of the present application detect the position of the moving coil by setting a displacement sensor and then controlling the air pressure inside the vibration table according to the detection result, so as to achieve the balance of the moving coil. This can improve the accuracy of the vibration test and prevent test errors caused by the oscillation of the moving coil.

[0026] The term “comprise” as used herein, and variations thereof such as “comprises”, “comprised”, “comprising”, “including”, and “containing”, do not exclude other features, components, elements, or steps unless the context clearly requires otherwise. Attached Figure Description

[0027] Figure 1 is a schematic diagram of the horizontal low-pressure vibration test device of this application;

[0028] Figure 2 is a schematic diagram of the structure of the vacuum vibration test bench of the horizontal low-pressure vibration test device of this application;

[0029] Figure 3 is a flowchart of the horizontal low-pressure vibration test method of this application. Detailed Implementation

[0030] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0033] As shown in Figures 1 to 3, this application provides a horizontal low-pressure vibration test device 100, including a negative pressure test chamber 1, a vacuum vibration test bench 2, a control unit, a support platform 3 protruding from the bottom wall into the negative pressure test chamber 1, a specimen mounting surface 4 disposed on the support platform 3, and a connector 5.

[0034] The negative pressure test chamber 1 includes a negative pressure chamber 11, a first vacuum pump for creating negative pressure inside the negative pressure chamber 11, a back pressure solenoid valve, and a negative pressure solenoid valve.

[0035] The backpressure solenoid valve connects the negative pressure chamber 11 to the outside air, and controls the on / off state of the first vacuum pump. Activating the backpressure solenoid valve connects the outside atmosphere to the negative pressure chamber 11 until the internal and external pressures are equal. Opening the negative pressure solenoid valve connects the first vacuum pump to the negative pressure chamber 11, thereby reducing the air pressure inside the negative pressure chamber 11.

[0036] The vacuum vibration test bench 2 includes a vibration table body 21, a moving coil 22 connected to the vibration table body 21 to output vibration, a second vacuum pump connected to the vibration table body 21, a high-pressure gas source connected to the vibration table body 21, a displacement sensor for detecting the position of the moving coil 22, a vacuum solenoid valve connecting the second vacuum pump and the vibration table body 21, and a gas source solenoid valve connecting the high-pressure gas source and the vibration table body 21.

[0037] The connector 5 connects the specimen mounting platform 4 to the moving coil 22.

[0038] During the operation of the negative pressure test chamber 1, there are pressure reduction and pressure increase sections. Therefore, the air pressure inside the vibration table 21 needs to be able to decrease and increase, hence the need for a high-pressure air source. If there is no high-pressure air source and it is directly connected to the air, the air pressure rise rate may not be sufficient. In addition, if the negative pressure chamber 11 returns to normal pressure and the vibration table 21 is also at normal pressure, there will be no support for the moving coil 22 and the specimen.

[0039] The vibration table 21 is arranged horizontally adjacent to the negative pressure test chamber 1, so that the horizontal low-pressure vibration test device 100 of this application can realize horizontal vibration test.

[0040] Both the vacuum solenoid valve and the air source solenoid valve are proportionally connected solenoid valves, and the air pressure inside the vibration table 21 is controlled by adjusting their opening degrees. In some embodiments, the rate of change of air pressure can also be adjusted by adjusting the ratio of the opening times of the vacuum solenoid valve and the air source solenoid valve. Of course, it is also possible to omit the vacuum solenoid valve and the air source solenoid valve and simply adjust the air pressure inside the vibration table 21 by controlling the operation of the second vacuum valve and the high-pressure air source.

[0041] The specimen mounting platform 4 is slidably disposed relative to the support platform 3 to achieve the effect of horizontal vibration of the specimen.

[0042] The control unit stores a position range threshold for the moving coil 22. When the moving coil 22 vibrates within the normal range, the control unit will not control the opening and closing of the vacuum solenoid valve and the air source solenoid valve. If the range is exceeded, it is determined that the air pressure on both sides of the moving coil 22 is unequal, and at this time, it is necessary to control the vacuum solenoid valve or the air source solenoid valve to open.

[0043] The horizontal low-pressure vibration test method includes the following steps:

[0044] S1: Provide the horizontal low-pressure vibration test device 100, place the specimen on the specimen mounting platform 4, and the displacement sensor detects the initial position of the moving coil 22.

[0045] S2: Start the first vacuum pump to create negative pressure inside the negative pressure test chamber 1, and start the second vacuum pump to create negative pressure inside the vibration table 21, thus stabilizing the position of the moving coil 22. In this step, the negative pressure solenoid valve and the vacuum solenoid valve need to be opened simultaneously. The position of the moving coil 22 can be stabilized by adjusting the opening degree or opening time of the vacuum solenoid valve. In addition, the high-pressure gas source is also turned on at the same time, and the high-pressure gas source is in the started and continuously supplying gas state, which can provide the necessary support gas pressure for the clamping work of the moving coil 22 and the subsequent specimen.

[0046] S3: Start the vacuum vibration test bench 2 to drive the specimen to vibrate on the specimen mounting surface 4. During the test, the first vacuum pump, the second vacuum pump, and the high-pressure gas source are all in working condition, but the gas pressure is adjusted by the negative pressure solenoid valve, the vacuum solenoid valve, and the gas source solenoid valve, as shown in step S4.

[0047] S4: The displacement sensor detects the position of the moving coil 22 and controls one of the vacuum solenoid valve and the gas source solenoid valve to open or both to close based on the position of the moving coil 22; here, "based on the position of the moving coil 22" means determining whether the moving coil 22 has deviated from the range threshold during vibration; when the displacement sensor detects that the moving coil 22 has deviated from the range threshold, it controls one of the vacuum solenoid valve and the gas source solenoid valve to open or both to close.

[0048] In step S4, the vacuum solenoid valve and the gas source solenoid valve specifically include: when the position of the moving coil 22 is stable, the vacuum solenoid valve and the gas source solenoid valve are both closed. At this time, the air pressure in the negative pressure test chamber 1 is constant, the air pressure in the vibration table 21 is also relatively constant, and the position of the moving coil 22 is also relatively stable.

[0049] When the moving coil 22 moves toward the negative pressure test chamber 1, the vacuum solenoid valve is opened and the air source solenoid valve is closed, the air pressure in the vibration table 21 decreases until the air pressure returns to the equilibrium point, the moving coil 22 returns to its initial position, and then both the vacuum solenoid valve and the air source solenoid valve are closed.

[0050] When the moving coil 22 moves away from the negative pressure test chamber 1, the control air source solenoid valve opens and the control vacuum solenoid valve closes, the air pressure inside the vibration table 21 increases until the air pressure returns to the equilibrium point, the moving coil 22 returns to its initial position, and then both the control vacuum solenoid valve and the air source solenoid valve close.

[0051] In step S4, the balance of the moving coil 22 is maintained by adjusting the opening time ratio of the vacuum solenoid valve and the gas source solenoid valve. The opening time ratio increases with time. That is, the opening time of the vacuum solenoid valve and the gas source solenoid valve increases every second, for example, starting from 0.1s in the 1st second, 0.2s in the 2nd second, 0.3s in the 3rd second, and so on, until the moving coil 22 is adjusted to the correct position. The next adjustment will start from the shortest opening time setting. The advantage of this is that the inflation and deflation speed increases linearly, and the appropriate speed can be quickly matched. At the same time, it reduces the calculation pressure on the control unit, as the same steps are executed each time, and the start and end times are determined based on the position of the moving coil 22.

[0052] S5: Complete the experiment and remove the specimen.

[0053] In step S5, after the experiment is completed, close the negative pressure solenoid valve, open the back pressure solenoid valve, close the vacuum solenoid valve, and open the gas source solenoid valve. While increasing the gas pressure inside the negative pressure test chamber 1, keep the moving coil 22 balanced until the negative pressure test chamber 1 reaches normal pressure. After closing the back pressure solenoid valve and the gas source solenoid valve, take out the test piece.

[0054] In step S5, the balance of the moving coil 22 is maintained by adjusting the opening time ratio of the air source solenoid valve. Because the atmospheric pressure rise of the negative pressure box 11 is relatively slow, the air source solenoid valve only needs to be open for a portion of the time, such as 0.2 seconds within 1 second. The specific opening time ratio is adjusted according to the position of the moving coil 22. Of course, in some embodiments, the opening ratio of the air source solenoid valve can also be controlled to achieve the balance of the moving coil 22.

[0055] The horizontal low-pressure vibration test apparatus 100 and method of this application detect the position of the moving coil 22 by setting a displacement sensor and then controlling the air pressure in the vibration table body 21 according to the detection result to achieve the balance of the moving coil 22. This can improve the accuracy of the vibration test and prevent test errors caused by the oscillation of the moving coil 22. By adjusting the opening time ratio of the vacuum solenoid valve and the gas source solenoid valve at different times, the inflation and deflation speed increases linearly, and a suitable speed can be quickly matched.

[0056] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A horizontal low-pressure vibration testing device, characterized in that: The horizontal low-pressure vibration test device includes a negative pressure test chamber, a vacuum vibration test bench, and a control unit. The negative pressure test chamber includes a negative pressure chamber body and a first vacuum pump for creating negative pressure inside the negative pressure chamber body. The vacuum vibration test bench includes a vibration table body, a moving coil connected to the vibration table body to output vibration, a second vacuum pump connected to the vibration table body, a high-pressure gas source connected to the vibration table body, and a displacement sensor for detecting the position of the moving coil. The vibration table body is arranged adjacent to the negative pressure test chamber in the horizontal direction.

2. The horizontal low-pressure vibration testing device according to claim 1, characterized in that: The horizontal low-pressure vibration test device also includes a vacuum solenoid valve connecting the second vacuum pump to the vibration table and a gas source solenoid valve connecting the high-pressure gas source to the vibration table.

3. The horizontal low-pressure vibration testing device according to claim 2, characterized in that: Both the vacuum solenoid valve and the gas source solenoid valve are proportional solenoid valves.

4. The horizontal low-pressure vibration testing device according to claim 1, characterized in that: The negative pressure test chamber also includes a back pressure solenoid valve and a negative pressure solenoid valve. The back pressure solenoid valve is used to connect the negative pressure chamber to the outside air, and the negative pressure solenoid valve is used to control the on / off state of the first vacuum pump.

5. The horizontal low-pressure vibration testing device according to claim 1, characterized in that: The horizontal low-pressure vibration test device also includes a support platform extending from the bottom wall into the negative pressure chamber, a specimen mounting surface disposed on the support platform, and a connector connecting the specimen mounting surface and the moving coil. The specimen mounting surface is slidably disposed relative to the support platform.

6. A method for testing horizontal low-pressure vibration, characterized in that: The horizontal low-pressure vibration test method includes the following steps: S1: Provide a horizontal low-pressure vibration test apparatus as described in any one of claims 1-5, wherein the specimen is placed on the specimen mounting platform and the displacement sensor detects the initial position of the moving coil; S2: Start the first vacuum pump to create negative pressure in the negative pressure test chamber, and start the second vacuum pump to create negative pressure in the vibration table body, so that the position of the moving coil is stable; S3: Start the vacuum vibration test bench to make the specimen vibrate on the specimen mounting platform; S4: The displacement sensor detects the position of the moving coil and controls one of the vacuum solenoid valve and the gas source solenoid valve to open or both to close based on the position of the moving coil; S5: Complete the experiment and remove the specimen.

7. The horizontal low-pressure vibration test method according to claim 6, characterized in that: In step S4, the opening and closing status of the vacuum solenoid valve and the gas source solenoid valve specifically includes: when the moving coil position is stable, both the vacuum solenoid valve and the gas source solenoid valve are closed; when the moving coil moves toward the negative pressure test chamber, the vacuum solenoid valve is opened until the moving coil returns to its initial position; when the moving coil moves away from the negative pressure test chamber, the gas source solenoid valve is opened until the moving coil returns to its initial position.

8. The horizontal low-pressure vibration test method according to claim 7, characterized in that: The control unit stores a moving coil position range threshold. When the displacement sensor detects that the moving coil has deviated from the range threshold, it controls one of the vacuum solenoid valve and the gas source solenoid valve to open or both to close.

9. The horizontal low-pressure vibration test method according to claim 7, characterized in that: In step S4, the balance of the moving coil is maintained by adjusting the opening time ratio of the vacuum solenoid valve and the gas source solenoid valve. The opening time ratio increases with the increase of time.

10. The horizontal low-pressure vibration test method according to claim 6, characterized in that: In step S5, after completing the experiment, close the negative pressure solenoid valve, open the back pressure solenoid valve, close the vacuum solenoid valve, and open the gas source solenoid valve. While increasing the gas pressure inside the negative pressure test chamber, maintain the balance of the moving coil until the negative pressure test chamber reaches normal pressure. After closing the back pressure solenoid valve and the gas source solenoid valve, take out the specimen.

11. The horizontal low-pressure vibration test method according to claim 10, characterized in that: In step S5, the moving coil is kept balanced by adjusting the opening time ratio of the air source solenoid valve.

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