A vibration table

Abstract

The present invention relates to a vibration table, on which a connector is formed, the connector and a pressure plate are fixed together, the connector, the pressure plate and the table body define at least one air chamber on the pressure plate, so that the position of the connector relative to the table body can be adjusted by adjusting the air pressure in the air chamber on the pressure plate. When the vibration table is used for testing experiments in a low-pressure environment, the dynamic coil will not be sucked into the low-pressure environment test box. Therefore, the vibration table has a wider range of applications.

Description

Technical Field

[0001] The invention relates to the technical field of environmental simulation experiments, and in particular to a vibration table. Background Art

[0002] The purpose of vibration test is to artificially simulate in the laboratory the vibration loads that the specimen may be subjected to during transportation, storage and use, as well as the impact of such loads on the specimen, and to assess its environmental adaptability and reliability.

[0003] Please refer to Figure 1 The vibration table 10 generally includes a table body 11, an excitation assembly 12, an air spring 13 and a moving coil 14. The vibration table can meet the needs of common vibration tests. However, in addition to separate vibration tests, the vibration table is often used in conjunction with an environmental test chamber. The environmental test chamber can provide an environment including temperature, humidity, low pressure and other conditions. Conventional vibration tables can meet the requirements for vibration tests under temperature and humidity conditions, but cannot be tested under low pressure conditions. The fundamental reason is that the conventional vibration table is an open structure, and the internal and external environments of the table body are connected. When the moving coil works in a low-pressure environment, due to the pressure difference between the upper and lower ends of the moving coil, the moving coil will be sucked into the low-pressure environment box and the test cannot be completed.

[0004] Commonly used vibration tables that can work in low pressure environments include Figure 2 As shown. The vibration table 20 includes a table body 21, an excitation assembly 22, a moving coil 24 and a connector 25 connected to the moving coil 24. The connector 25 is used to connect to an environmental test chamber for various tests. The vibration table 20 is a water-cooled vibration test equipment with a fully enclosed structure. The entire table body of the vibration table is used as an air chamber structure to balance the pressure above and below the moving coil. The vibration table is expensive, complex in structure, difficult to maintain, and not universal. Summary of the invention

[0005] The purpose of the present invention is to solve the above-mentioned problem and to provide a vibration table. When the vibration table is used for testing experiments in a low-pressure environment, the dynamic coil will not be sucked into the low-pressure environment test box.

[0006] The present invention provides a vibration table, comprising: a table body, a guide structure and an excitation component arranged on the table body, a moving coil driven by the excitation component, an air spring connected to the moving coil, and a connector fixed on the moving coil; the connector is used to be matched with other components, a pressure plate is fixed on the connector, and the connector and the pressure plate are both slidably and sealedly connected to the table body; the connector, the pressure plate and the table body define at least one air chamber on the pressure plate, and the position of the connector relative to the table body can be adjusted by controlling the air pressure in the air chamber.

[0007] In one of the embodiments, a ventilation port communicating with the air chamber on the pressure plate is provided on the platform.

[0008] In one embodiment, the ventilation port includes an air intake port for intake of air and an exhaust port for exhaust of air.

[0009] In one embodiment, the connector, the pressure plate and the platform further define at least one pressure plate lower air chamber, and the pressure plate upper air chamber and the pressure plate lower air chamber are respectively arranged on the upper and lower sides of the pressure plate.

[0010] In one of the embodiments, a lower cylinder air chamber is formed on the table body, and the lower cylinder air chamber is connected to the external air pressure of the vibration table, and the lower cylinder air chamber is also connected to the lower air chamber of the pressure plate.

[0011] In one of the embodiments, a lower cylinder air chamber is formed on the table body, and the lower cylinder air chamber is connected to the external air pressure of the vibration table, and the lower cylinder air chamber is not connected to the lower air chamber of the pressure plate.

[0012] In one of the embodiments, a ventilation port communicating with the air chamber under the pressure plate is provided on the platform.

[0013] In one of the embodiments, the air chamber on the pressure plate includes two air chambers isolated from each other.

[0014] In one of the embodiments, an environmental test chamber is connected to the connector.

[0015] In one embodiment, the pressure plate and the connector are an integrally formed structure.

[0016] The vibration table of the present invention is provided with a connector, which is fixed to a pressure plate, and the connector, the pressure plate and the table body define at least one air chamber on the pressure plate, so that the position of the connector relative to the table body can be adjusted by adjusting the air pressure in the air chamber on the pressure plate. When the vibration table is used for testing experiments in a low-pressure environment, the dynamic coil will not be sucked into the low-pressure environment test box. Therefore, the vibration table has a wider range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a commonly used schematic diagram of a vibration table structure;

[0018] Figure 2 This is another commonly used schematic diagram of the vibration table structure;

[0019] Figure 3 Schematic diagram of a vibration table according to an embodiment of the present invention. DETAILED DESCRIPTION

[0020] The present invention is described in detail below in conjunction with the accompanying drawings.

[0021] Please refer to Figure 3 , this embodiment provides a vibration table 100. The vibration table 100 includes: a table body 110, a guide structure and an excitation assembly 120 arranged on the table body 110, a moving coil 140 driven by the excitation assembly 120, an air spring 136 connected to the moving coil 140, and a connector 150 fixed to the moving coil 136. Among them, the table body 110 includes an upper cylinder body 112 and a lower cylinder body 114. The upper cylinder body 112 and the lower cylinder body 114 are fixed to each other. The guide mechanism includes an upper guide mechanism 132 and a lower guide mechanism 134. The upper guide mechanism 132 and the lower guide mechanism 134 are both arranged in the lower cylinder body 114, and the two cooperate with each other to limit the range of motion of the moving coil 140. One end of the lower guide mechanism 134 is connected to the moving coil 140, and the other end is connected to the air spring 136. The excitation assembly 120 is also arranged in the lower cylinder body 114. The excitation assembly 120 provides power for the vibration of the moving coil 140. The moving coil 140 is partially located in the lower cylinder 114 and partially located in the upper cylinder 112. A connector 150 is fixed to the moving coil 140. The connector 150 is used for connecting with other components. In this embodiment, it is used to connect with an environmental test box to perform the required vibration test. The environmental test box is not shown here.

[0022] In addition, a pressure plate 152 is fixed on the connector 150. The pressure plate 152 and the connector 150 are an integrally formed structure. In other embodiments, the pressure plate 152 and the connector 150 can be a structure assembled together in a split manner. The connector 150 and the pressure plate 152 are both slidably and sealedly connected to the platform 110. The connector 150, the pressure plate 152 and the platform 110 define at least one air chamber 111 on the pressure plate, and the position of the connector 150 relative to the platform 110 can be adjusted by controlling the air pressure in the air chamber. In other words, the connector 150 and the pressure plate 152 can both slide relative to the upper cylinder body 112, and the pressure on the pressure plate 152 can be adjusted by inputting gas or reducing gas into the air chamber 111 on the pressure plate defined by the connector 150, the pressure plate 152 and the platform 110, thereby adjusting the position of the pressure plate 152 and the connector 150.

[0023] The vibration table further includes an upper cover 118, and the upper cylinder 112 and the lower cylinder 114 are fixed together by the upper cover 118. Of course, in other embodiments, the upper cylinder 112 and the lower cylinder 114 can also be connected together by other components or other connection methods, and of course the upper cylinder 112 and the lower cylinder 114 can also be combined together by an integral molding method. A dustproof film 116 is also connected to the upper cover 118. The lower cylinder 114 has a lower cylinder air chamber 115 in it.

[0024] from Figure 3As can be seen in the figure, the connector 150, the pressure plate 152 and the platform 110 define the upper air chamber 111 of the pressure plate and the lower air chamber 113 of the pressure plate. There is a gap between the connector 150, the pressure plate 152 and the platform 110, and the gap is filled in a flexible sealing manner to ensure the sealing of the upper air chamber 111 of the pressure plate and the lower air chamber 113 of the pressure plate. The upper air chamber 111 of the pressure plate and the lower air chamber 113 of the pressure plate are respectively arranged on the upper and lower sides of the pressure plate. The number of the upper air chamber 111 of the pressure plate and the lower air chamber 113 of the pressure plate is at least one, and the actual number can be adjusted according to actual needs. For example, the upper air chamber 111 of the pressure plate may include two air chambers separated from each other.

[0025] A lower cylinder air chamber 115 is formed on the table body 110, and the lower cylinder air chamber 115 is connected to the external air pressure (i.e., atmospheric pressure or external environmental pressure) of the vibration table 100. The lower cylinder air chamber 115 is not connected to the lower air chamber 113 of the pressure plate. At this time, because the upper air chamber 111 of the pressure plate and the lower air chamber 113 of the pressure plate are isolated from each other and are separately closed, the relative position of the pressure plate 152 can be adjusted by adjusting the pressure difference between the upper air chamber 111 of the pressure plate and the lower air chamber 113 of the pressure plate. Of course, in other embodiments, it can also be designed to be a structure in which the lower cylinder air chamber 115 is connected to the lower air chamber 113 of the pressure plate. At this time, the position of the pressure plate 152 can be adjusted by adjusting the pressure in the upper air chamber 111 of the pressure plate.

[0026] In this embodiment, the body 110 of the vibration table 100 is provided with ventilation ports connected to the upper air chamber 111 of the pressure plate and the lower air chamber 113 of the pressure plate. These ventilation ports include an air inlet 111a for air intake and an exhaust port 111b for exhaust. Of course, only one ventilation port may be provided for each, and air intake or exhaust may be performed at the same time. The lower air chamber 113 of the pressure plate may be directly connected to the outside through the air inlet or the exhaust port.

[0027] When an object needs to be tested, an environmental test box can be connected to the connector 150. The object is placed in the environmental test box, and the object is tested by controlling environmental conditions such as temperature, humidity, and pressure. When a low-pressure test is required, the interior of the environmental test chamber is at low pressure, and the outside of the vibration device is open (equivalent to being connected to atmospheric pressure); when there is no vibration, the moving coil 140 drives the connector 150 to move upward due to the effect of negative pressure. Therefore, in order to ensure that the object in the environmental test chamber in a low-pressure environment is located in the test position (i.e., the position when there is no low pressure), it is necessary to introduce high-pressure gas into the cavity above the pressure plate 152 (i.e., the air chamber 111 on the pressure plate) to offset the displacement caused by the negative pressure, so that the pressure plate 152 returns to the position when there is no low pressure; after adjustment, the vibration table 100 can be turned on to start the vibration test; when the vibration table 100 is turned on, power is turned on to cause the excitation assembly 120 and the moving coil 140 to produce relative up and down movement, and the moving coil 140 moves up and down under the guidance of the upper guide mechanism 132 and the lower guide mechanism 134, and the moving coil 140 drives the connector 150 and the pressure plate 152 to vibrate at the same time.

[0028] The vibration table is formed with a connector, which is fixed to a pressure plate. The connector, the pressure plate and the table body define at least one air chamber on the pressure plate, so that the position of the connector relative to the table body can be adjusted by adjusting the air pressure in the air chamber on the pressure plate. When the vibration table is used for testing experiments in a low-pressure environment, the dynamic coil will not be sucked into the low-pressure environment test box. The vibration table has good versatility, can be quickly installed, and has low maintenance costs. At the same time, the vibration table has less modification than conventional air-cooled and water-cooled vibration tables, and has the ability to work in a low-pressure environment under small modification conditions, so it has a wider range of applications.

[0029] It should be emphasized that the above are only preferred embodiments of the present invention and do not limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A vibration table, characterized in that: include: A platform, a guide structure and an excitation assembly arranged on the platform, a moving coil driven by the excitation assembly, an air spring connected to the moving coil, and a connector fixed to the moving coil; the connector is used to match with other components, a pressure plate is fixed on the connector, and the connector and the pressure plate are both slidably and sealedly connected to the platform; the connector, the pressure plate and the platform define at least one air chamber on the pressure plate, and the position of the connector relative to the platform can be adjusted by controlling the air pressure in the air chamber; The connector, the pressure plate and the platform body also define at least one air chamber below the pressure plate, and the upper air chamber of the pressure plate and the lower air chamber of the pressure plate are respectively arranged on the upper and lower sides of the pressure plate; the platform body is provided with a ventilation port connected to the upper air chamber of the pressure plate; the platform body is provided with a ventilation port connected to the lower air chamber of the pressure plate.

2. The vibration table according to claim 1, characterized in that: The ventilation port includes an air intake port for intake of air and an exhaust port for exhaust of air.

3. The vibration table according to claim 1, characterized in that: A lower cylinder air chamber is formed on the platform body, and the lower cylinder air chamber is connected to the external air pressure of the vibration platform, and the lower cylinder air chamber is also connected to the lower air chamber of the pressure plate.

4. The vibration table according to claim 1, characterized in that: A lower cylinder air chamber is formed on the table body, and the lower cylinder air chamber is connected to the external air pressure of the vibration table, and the lower cylinder air chamber is not connected to the lower air chamber of the pressure plate.

5. The vibration table according to any one of claims 1 to 4, characterized in that: The air chamber on the pressure plate includes two air chambers isolated from each other.

6. The vibration table according to any one of claims 1 to 4, characterized in that: The connector is connected with an environmental test box.

7. The vibration table according to any one of claims 1 to 4, characterized in that: The pressure plate and the connector are an integrally formed structure.

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