Horizontal low-pressure vibration test apparatus

Abstract

The present application discloses a horizontal low-pressure vibration test apparatus. The horizontal low-pressure vibration test apparatus comprises a negative-pressure enclosure, a vacuum vibration test platform, and a vibration sealing element that connects the vacuum vibration test platform to the negative-pressure enclosure; the negative-pressure enclosure comprises side walls, a bottom wall, and a first vacuum pump used for forming negative pressure in the negative-pressure enclosure; the vacuum vibration test platform comprises a vibration platform, a moving coil connected to the vibration platform to output vibration, a second vacuum pump connected to the vibration platform, and a high-pressure air source connected to the vibration platform; the vibration platform is arranged adjacent to the negative-pressure enclosure in the horizontal direction. The horizontal low-pressure vibration test apparatus in the present invention can implement negative-pressure vibration testing in the horizontal direction, and by providing the vibration platform and the second vacuum pump, the moving coil can be balanced, thereby preventing uneven force caused by the moving coil being subjected to unilateral negative pressure.

Description

Horizontal low-pressure vibration test device

[0001] This application is based on and claims priority to Chinese Patent Application No. 202410508872.2, 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. 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] Existing technologies only have negative pressure testing devices for vertical vibration testing. Moreover, the negative pressure inside the test chamber of existing negative pressure testing devices can easily cause the moving coil to deviate from the center position, thus affecting the test results.

[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 negative pressure tests can only perform vertical tests.

[0009] To achieve one of the above-mentioned objectives, this application provides a horizontal low-pressure vibration testing device, which includes a negative pressure chamber, a vacuum vibration test bench, and a vibration sealing element connecting the vacuum vibration test bench and the negative pressure chamber. The negative pressure chamber includes a side wall, a bottom wall, and a first vacuum pump for forming a negative pressure inside the negative pressure chamber. 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, and a high-pressure gas source connected to the vibration table body. The vibration table body is arranged adjacent to the negative pressure chamber in a horizontal direction.

[0010] As a further improvement to the embodiments of this application, the vibration table body is provided with an air inlet pipe and an air outlet pipe, and the vacuum vibration test bench further includes an electromagnetic valve connected to the air inlet pipe and the air outlet pipe, and the electromagnetic valve is connected to the second vacuum pump and the high-pressure gas source.

[0011] As a further improvement to the embodiments of this application, the vacuum vibration test bench also includes a displacement sensor for detecting the displacement of the moving coil.

[0012] 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.

[0013] As a further improvement of the embodiments of this application, the horizontal low-pressure vibration test device further includes a vibration sealing element connecting the moving ring of the vacuum vibration test bench and the sealed box. The vibration sealing element includes a first fixed ring fixed to the moving ring, a second fixed ring surrounding the first fixed ring in the horizontal direction, and an elastic sealing ring membrane connecting the first fixed ring and the second fixed ring.

[0014] As a further improvement of the embodiments of this application, the support platform includes a support platform body, at least two horizontal slides fixedly disposed on the support platform body, a guide support fixed on the horizontal slides, and a flexible vibration isolation assembly. The flexible vibration isolation assembly includes a first vibration isolation member fixed to the support platform body, a second vibration isolation member surrounding the first vibration isolation member in a horizontal direction, and a vibration isolation sealing ring connecting the first vibration isolation member and the second vibration isolation member. The vibration isolation sealing ring is made of a flexible material, and the first vibration isolation member and the second vibration isolation member are spaced apart.

[0015] As a further improvement to the embodiments of this application, the vacuum vibration test bench further includes a vibration base for supporting the vibration table body and a trunnion for connecting the vibration table body and the vibration base.

[0016] As a further improvement of the embodiments of this application, the side wall is provided with a transmission hole, and the negative pressure box includes a transmission seal disposed in the transmission hole and a transmission assembly passing through the transmission seal hole. The transmission seal includes a transmission inner ring, a transmission outer ring disposed radially outside the transmission inner ring and spaced apart from the transmission inner ring, and a sealing ring membrane connected between the transmission outer ring and the transmission inner ring.

[0017] As a further improvement to the embodiments of this application, the transmission assembly includes a transmission shaft passing through the seal, a first universal joint disposed at one end of the transmission shaft and located inside the sealing test chamber, a second universal joint disposed outside the sealing test chamber, a first connecting shaft connected to the first universal joint, and a second connecting shaft connected to the second universal joint.

[0018] Compared with the prior art, the beneficial effects of this application are as follows: the horizontal low-pressure vibration test device of the embodiment of this application can realize the horizontal negative pressure vibration test, and by setting up a vibration table and a second vacuum pump, the moving coil can be balanced, preventing the moving coil from being subjected to uneven force due to unilateral negative pressure.

[0019] 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

[0020] Figure 1 is a schematic diagram of the horizontal low-pressure vibration test device of this application;

[0021] Figure 2 is a structural schematic diagram of the negative pressure chamber of the horizontal low-pressure vibration test device of this application;

[0022] Figure 3 is an enlarged structural diagram of region A in Figure 1;

[0023] Figure 4 is a cross-sectional view of the excitation source of the horizontal low-pressure vibration test device of this application inside the negative pressure chamber;

[0024] Figure 5 is a cross-sectional view of the driven component of the horizontal low-pressure vibration test device of this application inside the negative pressure chamber;

[0025] Figure 6 is an enlarged structural diagram of region B in Figure 5;

[0026] Figure 7 is a structural schematic diagram of the transmission seal and part of the transmission components of the horizontal low-pressure vibration test device of this application;

[0027] Figure 8 is a schematic diagram of the structure in Figure 7 from another angle;

[0028] Figure 9 is a top view of the structure in Figure 7;

[0029] Figure 10 is a schematic diagram of the cross-sectional structure in the CC direction of Figure 9;

[0030] Figure 11 is an enlarged structural diagram of region D in Figure 10;

[0031] Figure 12 is a three-dimensional structural diagram of the support platform of the horizontal low-pressure vibration test device of this application;

[0032] Figure 13 is a top view of the support platform of the horizontal low-pressure vibration test device of this application;

[0033] Figure 14 is a schematic diagram of the cross-sectional structure in the EE direction of Figure 13;

[0034] Figure 15 is an enlarged structural diagram of region F in Figure 14;

[0035] Figure 16 is a three-dimensional structural schematic diagram of the guide support component of the support platform of the horizontal low-pressure vibration test device of this application.

[0036] Figure 17 is a top view of the guide support component of the support platform of the horizontal low-pressure vibration test device of this application.

[0037] Figure 18 is a schematic diagram of the cross-sectional structure in the GG direction of Figure 17;

[0038] Figure 19 is a schematic diagram of a portion of the structure of the horizontal low-pressure vibration test device of this application;

[0039] Figure 20 is a schematic diagram of the trunnion structure of the horizontal low-pressure vibration test device of this application;

[0040] Figure 21 is a schematic diagram of the trunnion structure of the horizontal low-pressure vibration test device of this application from another angle.

[0041] Figure 22 is a top view of the trunnion structure of the horizontal low-pressure vibration test device of this application;

[0042] Figure 23 is a schematic diagram of the cross-sectional structure of HH in Figure 22;

[0043] Figure 24 is a schematic diagram of the vibration seal of the horizontal low-pressure vibration test device of this application;

[0044] Figure 25 is a schematic diagram of the vibration seal of the horizontal low-pressure vibration test device of this application from another angle.

[0045] Figure 26 is a cross-sectional schematic diagram of the vibration seal of the horizontal low-pressure vibration test device of this application;

[0046] Figure 27 is an enlarged structural diagram of region I in Figure 26. Detailed Implementation

[0047] 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.

[0048] 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.

[0049] 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.

[0050] As shown in Figures 1 to 27, the horizontal low-pressure vibration test device 100 of this application includes a negative pressure chamber 1, a vacuum vibration test bench 4, a vibration sealing member 6 connecting the vacuum vibration test bench 4 and the negative pressure chamber 1, a support platform 2 protruding into the negative pressure chamber 1, a specimen mounting surface 3 disposed on the support platform 2, and a connector 5 connecting the specimen mounting surface 3 and the vacuum vibration test bench 4.

[0051] As shown in Figures 1 to 11, the negative pressure chamber 1 includes a side wall 11, a bottom wall 12, a first vacuum pump for forming a negative pressure inside the negative pressure chamber 1, a transmission seal 14, and a transmission assembly 15.

[0052] The side wall 11 is provided with a connecting through hole 111 and a transmission hole 112, and the connecting through hole 111 is for the connector 5 to pass through.

[0053] If the test specimen is either excitation source 7 or driven component 8, and the excitation source 7 and driven component 8 are connected via the transmission assembly 15, both excitation source 7 and driven component 8 can be test specimens. Therefore, when one of the excitation source 7 and driven component 8 is used as a test specimen, it needs to be placed inside the negative pressure chamber 1, while the other is placed outside the negative pressure chamber 1. The excitation source 7 or driven component 8 placed inside the negative pressure chamber 1 is located on the test specimen mounting platform 3, and the test specimen mounting platform 3 and the test specimen are driven by the vacuum vibration test bench 4 to vibrate in the horizontal direction.

[0054] In addition, since the excitation source 7 outputs power in the form of rotation, the excitation source 7 will have a certain displacement when it is tested on the test specimen mounting platform 3, and its position is not fixed. Therefore, the transmission assembly 15 is set to transmit axial reciprocating motion and rotation.

[0055] The transmission assembly 15 includes a transmission shaft 151 passing through the transmission seal 14, a first universal joint 152 disposed at one end of the transmission shaft 151 and located inside the negative pressure chamber 1, a second universal joint 153 disposed at the other end of the transmission shaft 151 and located outside the negative pressure chamber 1, a first connecting shaft 154 connected to the first universal joint 152, and a second connecting shaft 155 connected to the second universal joint 153. One of the excitation source 7 and the driven member 8 is connected to the first connecting shaft 154, and the other is connected to the second connecting shaft 155.

[0056] The first universal joint 152 and the second universal joint 153 can transmit both rotational and axial reciprocating motion, thereby preventing internal jamming caused by changes in the position of the transmission coupling 151.

[0057] The negative pressure box 1 is provided with a fixing plate 13 that protrudes radially into the transmission hole 112. The fixing plate 13 has a through hole for the transmission shaft 151 to pass through. The transmission seal 14 is fixedly connected to the fixing plate 13.

[0058] By connecting the excitation source 7 and the driven member 8 through the first universal joint 152 and the second universal joint 153, the transmission of axial reciprocating motion and rotational motion can be realized without being affected by vibration.

[0059] As shown in Figures 7 to 11, the transmission seal 14 includes a transmission inner ring 141, a transmission outer ring 142 radially disposed outside the transmission inner ring 141 and spaced apart from the transmission inner ring 141, a sealing ring membrane 143 and an axial sealing ring 144 connected between the transmission outer ring 142 and the transmission inner ring 141.

[0060] The sealing ring membrane 143 covers the gap between the inner transmission ring 141 and the outer transmission ring 142 along the axial direction, and the thickness of the sealing ring membrane 143 along the radial direction, both inside and outside, is greater than the thickness in the middle.

[0061] The transmission inner ring 141 includes a first transmission inner ring 1411 and a second transmission inner ring 1412 fixed along the axial direction. A first retaining groove 1413 is formed between the first transmission inner ring 1411 and the second transmission inner ring 1412 to retain the sealing ring membrane 143. The first transmission inner ring 1411 and the second transmission inner ring 1412 are fixed by a first screw 1414. In this embodiment, both the first transmission inner ring 1411 and the second transmission inner ring 1412 are provided with multiple threaded holes.

[0062] The transmission inner ring 141 of the transmission seal is provided with a limiting block 1418 and a relief hole 1415 formed along the axial direction for the transmission coupling 151 to pass through. The relief hole 1415 is coaxially arranged with the transmission inner ring 141.

[0063] The transmission outer ring 142 is used to be fixedly connected to the fixed plate 13. The transmission outer ring 142 includes a first transmission outer ring 1421 and a second transmission outer ring 1422 fixed along the axial direction, and a second retaining groove 1423 is formed between the first transmission outer ring 1421 and the second transmission outer ring 1422 to retain the sealing ring membrane 143.

[0064] In this embodiment, the first transmission outer ring 1421 is disposed on the side near the fixed plate 13, and the second transmission outer ring 1422 is recessed inward on the side away from the first transmission outer ring 1421 to form a sealing groove 1424. The axial sealing ring 144 is disposed in the sealing groove 1424. The axial sealing ring 144 abuts against the first transmission outer ring 1421 and the fixed plate 13, which can improve the sealing effect between the negative pressure box 1 and the transmission seal 14.

[0065] The first transmission outer ring 1421 and the second transmission outer ring 1422 are also provided with a plurality of corresponding screw holes. The first transmission outer ring 1421 and the second transmission outer ring 1422 are fixedly connected by a second screw 1425. At the same time, the second screw 1425 passes through the screw holes on the first transmission outer ring 1421 and the second transmission outer ring 1422 and is also fixedly connected to the fixing plate 13.

[0066] In this embodiment, the inner transmission ring 141 and the outer transmission ring 142 are spaced apart. When the transmission shaft 151 vibrates slightly, it will only cause the inner transmission ring 141 to vibrate, and will not transmit the vibration to the outer transmission ring 142, nor to the fixed plate 13 fixedly connected to the outer transmission ring 142 and the negative pressure box 1. The transmission seal 14 can play a good vibration reduction role. The sealing ring diaphragm 143 can play a sealing role on the one hand, and has a certain elasticity in the radial direction on the other hand, which can play a role in limiting the position of the inner transmission ring 141.

[0067] The thickness of the first retaining groove 1413 near the outer transmission ring 142 is less than the thickness away from the outer transmission ring 142, and the thickness of the second retaining groove 1423 near the inner transmission ring 141 is less than the thickness away from the inner transmission ring 141. This arrangement can effectively limit the sealing ring diaphragm 143 radially, preventing the sealing ring diaphragm 143 from being pulled off when the inner transmission ring 141 vibrates.

[0068] The clearance hole 1415 is provided with a radial sealing ring 1416 and a positioning ring 1417. The radial sealing ring 1416 is arranged around the transmission shaft 151 and abuts against the transmission shaft 151. The positioning ring 1417 is arranged around the transmission shaft 151 and also abuts against the transmission shaft 151.

[0069] The number of positioning rings 1417 is at least two, and they are respectively arranged axially on both sides of the radial sealing ring 1416. The positioning rings 1417 are made of Teflon material and abut against the transmission shaft 151 radially. The positioning rings 1417 can provide lubrication, facilitate the axial movement or rotation of the transmission shaft 151, provide a certain support strength, and also serve to position the radial sealing ring 1416.

[0070] In this embodiment, there are two radial sealing rings 1416 and three positioning rings 1417, and the positioning rings 1417 and the radial sealing rings 1416 are arranged alternately.

[0071] In this embodiment, the limiting block 1418 extends radially into the relief hole 1415, and the positioning ring 1417 is axially disposed on the side away from the radial sealing ring 1416.

[0072] The limiting block 1418 extends radially into the relief hole 1415, and the positioning rings 1417, which are axially positioned on both sides away from the radial sealing ring 1416, are positioned on the side of the positioning rings 1417. The limiting block 1418 can limit the axial position of the positioning rings 1417 and the radial sealing rings 1416, preventing the positioning rings 1417 and the radial sealing rings 1416 from disengaging from the relief hole 1415.

[0073] By setting the transmission seal 14 and the radial sealing ring 1416, a good sealing effect is achieved in the negative pressure box 1.

[0074] As shown in Figures 12 to 18, the support platform 2 protrudes into the negative pressure chamber 1 through the bottom wall 12. The specimen mounting surface 3 is slidably disposed relative to the support platform 2.

[0075] The support platform 2 includes a support platform body 21, at least two horizontal slides 22 fixedly mounted on the support platform body 21, guide support members 23 fixedly mounted on the horizontal slides 22, and flexible vibration isolation components 24.

[0076] The support platform 21 is rectangular, and the horizontal slide 22 is fixedly connected to the support platform 21 or integrally formed.

[0077] The bottom of the negative pressure box 1 has a structural channel, and the support platform 21 is disposed in the structural channel and protrudes into the negative pressure box 1.

[0078] In this embodiment, the flexible vibration isolation component 24 is used to connect the negative pressure box 1 and the support platform 21.

[0079] The flexible vibration isolation assembly 24 includes a first vibration isolation member 241 fixed to the support platform 21, a second vibration isolation member 242 surrounding the first vibration isolation member 241 in a horizontal direction, and a vibration isolation sealing ring 243 connecting the first vibration isolation member 241 and the second vibration isolation member 242.

[0080] The first vibration isolation member 241 is fixedly connected to the support platform 21, and the second vibration isolation member 242 is fixedly connected to the negative pressure box 1. The first vibration isolation member 241 and the second vibration isolation member 242 are arranged at intervals.

[0081] As shown in Figure 15, the vibration isolation sealing ring 243 is made of flexible material. The vibration isolation sealing ring 243 is disposed between the first vibration isolation member 241 and the second vibration isolation member 242. On the one hand, it can play a sealing role, and on the other hand, it can prevent the vibration of the support platform 21 from being transmitted to the negative pressure box 1 through the flexible vibration isolation assembly 24. Since the vibration isolation sealing ring 243 is made of flexible material, it has a certain degree of extensibility in the horizontal direction.

[0082] The first vibration isolator 241 includes an upper first vibration isolator 2411 and a lower first vibration isolator 2412 fixed along the height direction. The second vibration isolator 242 includes an upper second vibration isolator 2421 and a lower second vibration isolator 2422 fixed along the height direction. The vibration isolation sealing ring 243 is respectively held between the upper first vibration isolator 2411 and the lower first vibration isolator 2412 and between the upper second vibration isolator 2421 and the lower second vibration isolator 2422 on its inner and outer sides.

[0083] Specifically, the thickness of the vibration isolation sealing ring 243 is greater in the radial direction at the inner and outer sides than in the middle. A first fixing groove 2413 for holding the vibration isolation sealing ring 243 is formed between the upper first vibration isolation member 2411 and the lower first vibration isolation member 2412. A second fixing groove 2423 for holding the vibration isolation sealing ring 243 is formed between the upper second vibration isolation member 2421 and the lower second vibration isolation member 2422. The thickness of the first fixing groove 2413 near the second vibration isolation member 242 is less than the thickness away from the second vibration isolation member 242. The thickness of the second fixing groove 2423 near the first vibration isolation member 241 is less than the thickness away from the first vibration isolation member 241.

[0084] Thus, the first fixing groove 2413 and the second fixing groove 2423 can prevent the vibration isolation sealing ring 243 from detaching from the first vibration isolation member 241 and the second vibration isolation member 242.

[0085] The upper first vibration isolator 2411 and the lower first vibration isolator 2412 are provided with multiple screw holes, through which the first vibration isolator 241 and the support platform 21 can be directly fixed and connected, and the vibration isolation sealing ring 243 can be fixed at the same time.

[0086] The upper second vibration isolator 2421 and the lower second vibration isolator 2422 are provided with multiple screw holes, through which the second vibration isolator 242 can be directly fixed to the negative pressure box 1, and at the same time the vibration isolator sealing ring 243 is fixed.

[0087] In this embodiment, the horizontal slide 22 is elongated, and each horizontal slide 22 is equipped with a plurality of guide supports 23.

[0088] As shown in Figures 16 to 18, the guide support 23 includes a guide seat 231 with a guide groove 2311 fixed on the horizontal slide table 22, a guide shaft 232 located in the guide groove 2311 and fixed to the guide seat 231, a bearing seat 233 arranged around the guide shaft 232 and slidable in the guide groove 2311, a bearing 234 arranged between the bearing seat 233 and the guide shaft 232, and end caps 235 fixed at both ends of the bearing seat 233 along the axial direction.

[0089] The guide seat 231 is fixed on the horizontal slide 22. The guide groove 2311 is recessed downward from the top of the guide seat 231. In this embodiment, the guide seat 231 is also provided with a fixing channel 2312 for the guide shaft 232 to pass through, and a drain hole 2313 communicating with the guide groove 2311. The fixing channel 2312 extends through the guide seat 231 along the extending direction of the horizontal slide 22 and passes through the guide groove 2311. The guide shaft 232 and the guide seat 231 are fixedly connected by screws.

[0090] The drain hole 2313 is used to drain the liquid accumulated in the guide groove 2311.

[0091] The guide seat 231, the horizontal slide 22, the support platform 21, and the guide shaft 232 can be made of stainless steel or high-strength aluminum alloy that has undergone micro-arc oxidation treatment to achieve higher strength.

[0092] The vibration transmission direction of the vibration table 4 is the same as the axial direction of the guide shaft 232 and also the same as the extension direction of the horizontal slide table 22.

[0093] The specimen mounting platform 3 is fixed to the bearing seat 233. The bearing seat 233 has a connecting hole, and the specimen mounting platform 3 can be fixedly connected to the bearing seat 233 by screws.

[0094] The bearing housing 233 has a through hole in its middle for the guide shaft 232 to pass through, and the diameter of the through hole is larger than the diameter of the guide shaft 232. That is, in this embodiment, the guide shaft 232 does not directly contact the bearing housing 233 radially.

[0095] The bearing 234 is fixed to the bearing housing 233. The bearing 234 is made of engineering plastic or copper alloy material, so it can withstand high and low pressure, high and low temperature and corrosive environment. It can slide relative to the guide shaft 232 without the use of lubricating oil, avoiding the deterioration of the lubrication effect of lubricating oil under high and low pressure.

[0096] Each of the guide support members 23 includes two bearings 234. The bearing seat 233 includes a limiting part 2331 that protrudes radially inward from the center of the through hole. The two bearings 234 abut against the limiting part 2331 axially. The limiting part 2331 is arranged radially at a distance from the guide shaft 232.

[0097] The bearing 234 abuts against the limiting part 2331 and the end cover 235 at both ends along the axial direction.

[0098] The bearing housing 233 has inwardly recessed end grooves 2332 at both ends, and the end cap 235 is disposed in the end grooves 2332. That is, in this embodiment, the bearing 234 is radially abutted between the bearing housing 233 and the guide shaft 232, and axially abutted between the end cap 235 and the limiting part 2331.

[0099] The support platform 2 can support the specimen mounting surface 3, and by setting the guide support 23, the vibration transmission of the specimen mounting surface 3 in the horizontal direction is realized. By setting the flexible vibration isolation component 24, the vibration can be prevented from being transmitted to the negative pressure box 1 through the support platform 2.

[0100] As shown in Figures 19 to 23, the vacuum vibration table 4 includes a vibration table body 41, a moving coil 42 connected to the vibration table body 41 to output vibration, a vibration base 43 for supporting the vibration table body 41, a trunnion 44 connecting the vibration table body 41 and the vibration base 43, a second vacuum pump connected to the vibration table body 41, a high-pressure gas source connected to the vibration table body, a vibration controller 45 for driving the vacuum pump, a power amplifier, a cooling unit for cooling the vibration table body 41, a gas supply unit 46, a solenoid valve, and a displacement sensor for detecting the displacement of the moving coil.

[0101] The vibration table body 41 is hollow and is formed by assembling multiple cylinders. Adjacent cylinders are sealed with O-rings, resulting in a fully sealed structure. When a negative pressure is generated within the negative pressure chamber 1, exerting an adsorption force on the moving coil 42, a vacuum pump can be used to create a negative pressure within the vibration table body 41 to counteract the adsorption force exerted on the moving coil 42 by the negative pressure chamber 1. The vibration table body 41 is arranged horizontally adjacent to the negative pressure chamber 1.

[0102] The vibration table body 41 is provided with an air inlet pipe and an air outlet pipe. The solenoid valve is connected to the air inlet pipe and the air outlet pipe, and the solenoid valve is connected to the second vacuum pump and the high-pressure gas source.

[0103] During operation, the negative pressure chamber 1 has both depressurization and depressurization phases. Therefore, the internal air pressure of the vibration table 41 needs to decrease or increase accordingly. Increasing the internal air pressure of the vibration table 41 requires a high-pressure air source. If a high-pressure air source is not provided and the pressure is directly connected to the air, the pressure rise rate will not meet the requirements. Furthermore, if the internal pressure of the vibration table 41 is also at normal pressure after the negative pressure chamber 1 returns to normal pressure, there will be no support for the moving coil 42 and the test piece.

[0104] The vibration controller 45 can control the operation of the second vacuum pump and the gas supply unit 46. The control result of the vibration controller 45 is determined based on the detection result of the displacement sensor. The power amplifier is used to coordinate the operation of the second vacuum pump, and the cooling unit is used to cool down the various components of the vacuum vibration table 4.

[0105] The vibration base 43 includes a lower base 431 and a side fixing seat 432 protruding upward from the lower base 431. The side fixing seats 432 are disposed on both sides of the vibration table body 41. There are two trunnions 44, which are respectively connected to the side fixing seats 432 on both sides.

[0106] As shown in Figures 20 to 23, the trunnion 44 includes a first fixing member 441 fixed to the vibration table body 41, a second fixing member 442 fixed to the vibration base 43, an air spring 443 abutting between the first fixing member 441 and the second fixing member 442, and a drive spring 444. The second fixing member 442 of the trunnion 44 is fixedly connected to the side fixing seat 432.

[0107] The first fixing member 441 includes a first abutting part 4411, a third abutting part 4412 which is axially spaced from the first abutting part 4411 along the moving coil 42, a fixing part 4413 connecting the first abutting part 4411 and the third abutting part 4412, and a vibration damping guide shaft 4414.

[0108] The fixing part 4413 is fixedly connected to the vibration table body 41 by screws.

[0109] The first abutment portion 4411 and the third abutment portion 4412 protrude from the fixing portion 4413 toward the side fixing seat 432. Both the first abutment portion 4411 and the third abutment portion 4412 have fixing holes 4415, through which the vibration damping guide shaft 4414 passes and is fixedly connected to the first abutment portion 4411 and the third abutment portion 4412. In this embodiment, there are two vibration damping guide shafts 4414, spaced apart along the height direction.

[0110] The second fastener 442 includes a second abutment portion 4421, a guide portion 4422, and a trunnion bearing 4423.

[0111] The second abutment 4421 is located between the first abutment 4411 and the third abutment 4412. The second abutment 4421 is located axially along the air spring 443 between the first abutment 4411 and the moving coil 42, that is, the first abutment 4411 is disposed on the side of the second abutment 4421 away from the moving coil 42.

[0112] The air spring 443 is fixedly connected at both ends to the first supporting part 4411 and the second supporting part 4421, respectively. The air spring 443 has a low resonant frequency, generally around 2Hz, while the vacuum vibration table 4 generally operates at a frequency above 5Hz, so resonance will not occur. Furthermore, the air spring 443 has a high load-bearing capacity and can be adjusted by the inflation pressure.

[0113] The air supply unit 46 is connected to the air spring 443 to control the air supply to the air spring 443. When the air pressure inside the negative pressure chamber 1 decreases, the air bladder of the air spring 443 needs to be inflated; when the air pressure inside the negative pressure chamber 1 increases, the air bladder of the air spring 443 is deflated, thus giving the air spring 443 a better vibration damping effect. Furthermore, since the vibration table 41 is affected by the negative pressure inside the negative pressure chamber 1, the first supporting part 4411 is located at the end of the air spring 443 away from the second supporting part 4421 to counteract the force on the vibration table 41.

[0114] The guide portion 4422 is fixedly connected to the second abutment portion 4421 and the vibration base 43.

[0115] The drive spring 444 abuts against the second abutment portion 4421 and the third abutment portion 4412. When the air spring 443 deflates, it drives the third abutment portion 4412, causing the first abutment portion 4411 to move toward the second abutment portion 4421, thereby causing the first abutment portion 4411 and the second abutment portion 4421 to press against the air spring 443.

[0116] The third abutting part 4412 has a limiting shaft 4416 protruding towards the second abutting part 4421, and the driving spring 444 is sleeved on the limiting shaft 4416 to prevent the driving spring 444 from disengaging.

[0117] The guide portion 4422 is provided with a guide hole 4424 through which the vibration damping guide shaft 4414 passes, and the trunnion bearing 4423 is disposed in the guide hole 4424 to abut against the vibration damping guide shaft 4414.

[0118] As shown in Figures 24 to 27, the vibration seal 6 connects the moving coil 42 of the vacuum vibration table 4 to the negative pressure chamber 1. The vibration seal 6 is used to seal the moving coil 42 and the side wall 11.

[0119] The vibration seal 6 includes a first fixed ring 61 fixed to the moving ring 42, a second fixed ring 62 surrounding the first fixed ring 61 in a horizontal direction, an elastic sealing ring membrane 63 connecting the first fixed ring 61 and the second fixed ring 62, a first sealing ring 64, and a second sealing ring 65.

[0120] The elastic sealing ring 63 is made of flexible material, and the first fixing ring 61 and the second fixing ring 62 are spaced apart.

[0121] The elastic sealing ring membrane 63 can serve a sealing function on the one hand, and prevent the vibration of the moving coil 42 from being transmitted to the negative pressure box 1 on the other hand.

[0122] In this embodiment, the moving ring 42 and the connecting through hole 111 are circular, and the vibration seal 6 is annular. Correspondingly, the first fixing ring 61, the second fixing ring 62, and the elastic sealing ring diaphragm 63 are all annular.

[0123] The first fixing ring 61 includes a first ring body 611 fixed in the horizontal direction near the negative pressure box 1 and a first limiting ring 612 fixed near the moving ring 42.

[0124] The second fixing ring 62 includes a second ring body 621 fixed in the horizontal direction near the negative pressure box 1 and a second limiting ring 622 fixed near the moving ring 42.

[0125] The elastic sealing ring 63 is respectively held between the first ring body 611 and the first limiting ring 612 and between the second ring body 621 and the second limiting ring 622 on its inner and outer sides.

[0126] The thickness of the elastic sealing ring membrane 63 is greater in the radial direction at the inner and outer sides than in the middle. A first limiting groove 613 is formed between the first ring body 611 and the first limiting ring 612 to hold the elastic sealing ring membrane 63. A second limiting groove 623 is formed between the second ring body 621 and the second limiting ring 622 to hold the elastic sealing ring membrane 63. The thickness of the first limiting groove 613 near the second fixing ring 62 is less than the thickness away from the second fixing ring 62. The thickness of the second limiting groove 623 near the first fixing ring 61 is less than the thickness away from the first fixing ring 61.

[0127] The first limiting ring 612 is fixedly connected to the side of the first ring body 611 near the second fixed ring 62, and the side of the first ring body 611 away from the second fixed ring 62 is fixedly connected to the side wall 11. The second limiting ring 622 is fixedly connected to the side of the second ring body 621 near the first fixed ring 61, and the side of the second ring body 621 away from the first fixed ring 61 is fixedly connected to the moving ring 42.

[0128] The first limiting groove 613 and the second limiting groove 623 can achieve the effect of detachment, that is, after the first limiting ring 612 is fixedly connected to the first ring body 611, the elastic sealing ring membrane 63 will not fall off from the first limiting groove 613, and after the second limiting ring 622 is fixedly connected to the second ring body 621, the elastic sealing ring membrane 63 will not fall off from the second limiting groove 623.

[0129] In addition, in this embodiment, the first limiting ring 612 is detachably connected to the first ring body 611 by screws, and the second limiting ring 622 is also detachably connected to the second ring body 621 by screws, so that the elastic sealing ring membrane 63 can be disassembled and replaced after it is damaged.

[0130] The first sealing ring 64 abuts between the moving ring 42 and the first ring body 611.

[0131] The second sealing ring 65 abuts between the side wall 11 and the second ring body 621.

[0132] The first ring 611 and the second ring 621 are connected to the moving ring 42 and the side wall 11 respectively by screws. The first sealing ring 64 and the second sealing ring 65 can prevent the negative pressure box 1 from communicating with the outside.

[0133] The horizontal low-pressure vibration testing device 100 of this application can realize horizontal negative pressure vibration testing. By setting up a vibration table 41 and a second vacuum pump, the moving coil 42 can be balanced, preventing the moving coil 42 from being subjected to uneven force due to unilateral negative pressure. By setting up a vibration seal 6, a vibration isolation seal ring 243 and a transmission seal 14, the vibration of the vacuum vibration test table 4, the specimen mounting surface 3 and the excitation source 7 can be prevented from being transmitted to the negative pressure chamber 1, thus avoiding shortening the life of the horizontal low-pressure vibration testing device 100 and not easily affecting the accuracy of the vibration test results.

[0134] 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.

[0135] 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 chamber, a vacuum vibration test bench, and a vibration sealing component connecting the vacuum vibration test bench and the negative pressure chamber. The negative pressure chamber includes a side wall, a bottom wall, and a first vacuum pump for creating negative pressure within the negative pressure chamber. 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, and a high-pressure gas source connected to the vibration table body. The vibration table body is arranged adjacent to the negative pressure chamber in a horizontal direction.

2. The horizontal low-pressure vibration testing device according to claim 1, characterized in that, The vibration table body is provided with an air inlet pipe and an air outlet pipe. The vacuum vibration test bench also includes an electromagnetic valve that is connected to the air inlet pipe and the air outlet pipe. The electromagnetic valve is connected to the second vacuum pump and the high-pressure gas source.

3. The horizontal low-pressure vibration testing device according to claim 1, characterized in that, The vacuum vibration test bench also includes a displacement sensor for detecting the displacement of the moving coil.

4. 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.

5. The horizontal low-pressure vibration testing device according to claim 4, characterized in that, The horizontal low-pressure vibration test device also includes a vibration sealing element connecting the moving ring of the vacuum vibration test bench to the sealed box. The vibration sealing element includes a first fixed ring fixed to the moving ring, a second fixed ring surrounding the first fixed ring in the horizontal direction, and an elastic sealing ring membrane connecting the first fixed ring and the second fixed ring.

6. The horizontal low-pressure vibration testing device according to claim 4, characterized in that, The support platform includes a support platform body, at least two horizontal slides fixedly mounted on the support platform body, guide support members fixed on the horizontal slides, and a flexible vibration isolation assembly. The flexible vibration isolation assembly includes a first vibration isolation member fixed to the support platform body, a second vibration isolation member surrounding the first vibration isolation member in a horizontal direction, and a vibration isolation sealing ring connecting the first vibration isolation member and the second vibration isolation member. The vibration isolation sealing ring is made of a flexible material, and the first vibration isolation member and the second vibration isolation member are spaced apart.

7. The horizontal low-pressure vibration testing device according to claim 1, characterized in that, The vacuum vibration test bench also includes a vibration base for supporting the vibration table body and a trunnion for connecting the vibration table body and the vibration base.

8. The horizontal low-pressure vibration testing device according to claim 1, characterized in that, The side wall is provided with a transmission hole. The negative pressure box includes a transmission seal disposed in the transmission hole and a transmission assembly passing through the transmission seal hole. The transmission seal includes a transmission inner ring, a transmission outer ring disposed radially outside the transmission inner ring and spaced apart from the transmission inner ring, and a sealing ring membrane connected between the transmission outer ring and the transmission inner ring.

9. The horizontal low-pressure vibration testing device according to claim 8, characterized in that, The transmission assembly includes a drive shaft passing through the seal, a first universal joint disposed at one end of the drive shaft and located inside the sealing test chamber, a second universal joint disposed outside the sealing test chamber, a first connecting shaft connected to the first universal joint, and a second connecting shaft connected to the second universal joint.

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