Electromagnetic and electrohydraulic composite vibration device and method of use thereof, and vibration table

Abstract

Disclosed in the present application is an electromagnetic and electrohydraulic composite vibration device. The electromagnetic and electrohydraulic composite vibration device comprises a cylinder, magnetic cylinder rings arranged on side edges of the cylinder in an axial direction, and a piston penetrating the cylinder in the axial direction, wherein an excitation member is arranged in each magnetic cylinder ring; drive coils are arranged on the piston; a force-bearing protrusion axially and outwardly protrudes from the middle of the piston; the force-bearing protrusion abuts against the cylinder in a radial direction; the drive coils are used for cooperating with the excitation members to drive the piston to move in the axial direction; the cylinder is hollow to form an upper hydraulic cavity and a lower hydraulic cavity, which are located on two sides of the force-bearing protrusion; and the cylinder is provided with a first hydraulic flow channel and a second hydraulic flow channel, which are respectively used for communicating with the upper hydraulic cavity and the lower hydraulic cavity. The electromagnetic and electrohydraulic composite vibration device and a method of use thereof, and a vibration table of the present application can achieve electromagnetic vibration and electrohydraulic vibration on a single vibration table, and feature wide frequency bandwidth coverage. Compared with two apparatuses that operate independently, the electromagnetic and electrohydraulic composite vibration device has lower costs and a smaller footprint.

Description

Electromagnetic electro-hydraulic composite vibration device and method of using same, vibration table

[0001] The present application is based on and claims priority to Chinese patent application No. 202411273533.7, filed on September 11, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the field of test devices, in particular to an electromagnetic electro-hydraulic composite vibration device, a method of using the same, and a vibration table. BACKGROUND

[0003] Currently, detection units and reliability laboratories at home and abroad usually use electromagnetic vibration tables to simulate high-frequency high-acceleration vibration such as blade fatigue test, satellite vibration test, and battery pack vibration test, and use electro-hydraulic vibration tables to simulate low-frequency large-displacement vibration such as packaging and transportation test of packaging, earthquake simulation test of large buildings and high-voltage electrical equipment. The index of electromagnetic vibration tables given by domestic manufacturers is about 2-2500Hz, displacement 51mm, 76mm, and high standard can reach 100mm, but for part of the packaging and transportation test with displacement exceeding 100mm, the electromagnetic vibration table for earthquake simulation test with 0.5Hz starting vibration and displacement of 200mm, 300mm or even higher cannot meet the requirements. The index of electro-hydraulic vibration tables given by domestic manufacturers is about 0.1-100Hz, and the acceleration is 5g, but for part of the high-frequency high-acceleration vibration test such as battery pack, the electro-hydraulic vibration table cannot meet the requirements.

[0004] Therefore, it is necessary to improve the existing vibration device to solve the above problems.

[0005] Any prior art mentioned in the specification does not mean that it is recognized or suggested that the prior art constitutes part of the common general knowledge in any jurisdiction, or can be reasonably expected to be understood, considered relevant and / or combined with other prior art by those skilled in the art.

[0006] SUMMARY

[0007] The purpose of the present application is to provide an electromagnetic electro-hydraulic composite vibration device to solve the problem that the existing vibration table cannot integrate electro-hydraulic vibration and electromagnetic vibration two working modes.

[0008] To achieve the above object, the application provides an electromagnetic electro-hydraulic composite vibration device, which comprises a cylinder body, a magnetic cylinder ring arranged on the side of the cylinder body in the axial direction, and a piston penetrating the cylinder body in the axial direction, wherein the magnetic cylinder ring is provided with an excitation element, the piston is provided with a driving coil, the middle part of the piston is provided with a stress protrusion which protrudes outward in the axial direction, the stress protrusion is in abutment with the cylinder body in the radial direction, the driving coil is used to drive the piston to move in the axial direction in cooperation with the excitation element, and the hollow cylinder body is provided with an upper hydraulic cavity and a lower hydraulic cavity which are located on both sides of the stress protrusion.

[0009] As a further improvement of the application, the electromagnetic electro-hydraulic composite vibration device further comprises an O-shaped servo valve which communicates the first hydraulic flow channel and the second hydraulic flow channel, when the O-shaped servo valve is closed, the first hydraulic flow channel and the second hydraulic flow channel are disconnected with the external hydraulic station, and when the O-shaped servo valve is working, the first hydraulic flow channel and the second hydraulic flow channel are in communication with the external hydraulic station.

[0010] As a further improvement of the application, the cylinder body is further provided with a third hydraulic flow channel and a fourth hydraulic flow channel which are used to communicate with the upper hydraulic cavity and the lower hydraulic cavity respectively, the electromagnetic electro-hydraulic composite vibration device further comprises an on-off valve which communicates the third hydraulic flow channel and the fourth hydraulic flow channel, when the on-off valve is closed, the third hydraulic flow channel and the fourth hydraulic flow channel are in communication with the external hydraulic station, when the on-off valve is working, the third hydraulic flow channel and the fourth hydraulic flow channel are disconnected with the external hydraulic station, and when the O-shaped servo valve is working, the on-off valve is working; when the excitation element and the driving coil are electrified, the O-shaped servo valve is closed, and the on-off valve is closed.

[0011] As a further improvement of the application, the electromagnetic electro-hydraulic composite vibration device further comprises a magnetic cylinder bottom arranged between the cylinder body and the magnetic cylinder ring, and a magnetic cylinder cover arranged on the side of the magnetic cylinder ring away from the cylinder body.

[0012] As a further improvement of the application, the number of the magnetic cylinder rings is two, and the two magnetic cylinder rings are arranged at the two ends of the cylinder body in the axial direction respectively.

[0013] As a further improvement of the application, two excitation elements are arranged in each magnetic cylinder ring, and the two excitation elements are arranged in the axial direction at intervals.

[0014] As a further improvement of the application, the magnetic cylinder ring is provided with a heat dissipation flow channel which faces the excitation element, and the electromagnetic electro-hydraulic composite vibration device further comprises a connecting flow channel which communicates the heat dissipation flow channels on both sides, and the number of the connecting flow channels is multiple, and the multiple connecting flow channels are arranged in an array around the cylinder body.

[0015] As a further improvement of the present application, the electromagnetic electro-hydraulic composite vibration device further comprises a cover arranged on the side of the magnetic cylinder ring away from the cylinder body, and the covers at both ends are respectively communicated with the heat dissipation flow channels on the magnetic cylinder rings at both sides, one of the covers is provided with an air inlet, and the other cover is provided with an air outlet.

[0016] As a further improvement of the present application, the electromagnetic electro-hydraulic composite vibration device further comprises a static pressure support assembly, the static pressure support assembly comprises a guide sleeve abutting against the piston in the radial direction, a guide sleeve arranged on the guide sleeve and close to the side of the magnetic cylinder ring for abutting against the piston, and a restrictor, the side of the guide sleeve close to the piston ring is recessed with a static pressure cavity and an oil return cavity communicated with the static pressure cavity, the restrictor and the static pressure cavity are connected through a static pressure channel, and the cylinder body is provided with an oil supply flow channel communicated with the restrictor.

[0017] The present application also provides a working method of the electromagnetic electro-hydraulic composite vibration device, the working method of the electromagnetic electro-hydraulic composite vibration device has at least two working modes, including:

[0018] High-frequency high-acceleration excitation mode: the excitation part is supplied with direct current, the drive coil is supplied with alternating current, the O-shaped servo valve is closed, the first hydraulic flow channel and the second hydraulic flow channel are disconnected with the external hydraulic station, and the on-off valve is closed, the third hydraulic flow channel and the fourth hydraulic flow channel are communicated with the external hydraulic station;

[0019] Ultra-low frequency large displacement excitation mode: the excitation part and the drive coil are not supplied with electricity, the O-shaped servo valve works, the first hydraulic flow channel and the second hydraulic flow channel are communicated with the external hydraulic station, the on-off valve works, and the third hydraulic flow channel and the fourth hydraulic flow channel are disconnected with the external hydraulic station.

[0020] As a further improvement of the present application, in the high-frequency high-acceleration excitation mode and the ultra-low frequency large displacement excitation mode, the static pressure support assembly is supplied with oil through the hydraulic station.

[0021] The present application also provides a vibration test bed, the vibration test bed comprises the electromagnetic electro-hydraulic composite vibration device.

[0022] Compared with the prior art, the electromagnetic electro-hydraulic composite vibration device and the use method and the vibration table can realize electromagnetic vibration and electro-hydraulic vibration on one vibration table, have wide frequency width, and have lower independent operation cost and smaller occupied area compared with two sets of equipment.

[0023] 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

[0024] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0025] Figure 1 is a three-dimensional structural schematic diagram of the electromagnetic-hydraulic composite vibration device of this application;

[0026] Figure 2 is a partial cross-sectional structural schematic diagram of the electromagnetic-hydraulic composite vibration device of this application;

[0027] Figure 3 is a front cross-sectional view of the electromagnetic-hydraulic composite vibration device of this application.

[0028] Figure 4 is an enlarged structural diagram of region A in Figure 3;

[0029] Figure 5 is a front structural schematic diagram of the piston of the electromagnetic-hydraulic composite vibration device of this application;

[0030] Figure 6 is a schematic diagram of the working method of the electromagnetic-hydraulic composite vibration device of this application. Detailed Implementation

[0031] 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.

[0032] 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.

[0033] In the description of the present application, it should be explained that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "linking" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0034] As shown in FIGS. 1-5, the vibration test bench includes an electromagnetic electro-hydraulic composite vibration device 100, a workbench for placing a workpiece, a base for supporting the electromagnetic electro-hydraulic composite vibration device 100, and other devices that need to be able to realize complete test functions.

[0035] The electromagnetic electro-hydraulic composite vibration device 100 includes a cylinder body 1, a magnetic cylinder ring 2 arranged on the side of the cylinder body 1 in the axial direction, a magnetic cylinder bottom 3 arranged between the cylinder body 1 and the magnetic cylinder ring 2, a magnetic cylinder cover 4 arranged on the side of the magnetic cylinder ring 2 away from the cylinder body 1, a piston 5 penetrating the cylinder body 1 in the axial direction, a cover 6 arranged on the side of the magnetic cylinder ring 2 away from the cylinder body 1, an O-type servo valve, a on-off valve, a static pressure support assembly 7, a connecting flow channel 8, a hydraulic station, and a controller.

[0036] The cylinder body 1 is arranged in the middle for the piston 5 to penetrate.

[0037] The number of the magnetic cylinder rings 2 is two, and the two magnetic cylinder rings 2 are respectively arranged at the two ends of the cylinder body 1 in the axial direction. The magnetic cylinder ring 2 is provided with an excitation element 21, and in the present embodiment, two excitation elements 21 are arranged in each magnetic cylinder ring 2, and the two excitation elements 21 are arranged in the axial direction.

[0038] The piston 5 is provided with a driving coil 51, and in the present embodiment, the number of the driving coils 51 is two, and one is arranged at each end of the piston 5, and each driving coil 51 is arranged corresponding to the excitation element 21 in the corresponding magnetic cylinder ring 2. The driving coil 51 is wound into a coil by enameled wire in the same direction and is fixed on the piston 5 by epoxy. The driving coil 51 is used to drive the piston 5 to move in the axial direction together with the excitation element 21.

[0039] When high-frequency high-acceleration excitation is required for the test, at this time the vibration test bench is equivalent to an electromagnetic vibration table, the excitation element 21 is energized to generate a ring-shaped magnetic field along the driving coil 51, the driving coil 51 on the piston 5 rod is connected to external alternating current, and under the action of the magnetic field, the piston 5 rod produces up-down reciprocating motion.

[0040] The middle part of the piston 5 is provided with a force protrusion 52 which protrudes outward in the axial direction and abuts against the cylinder body 1 in the radial direction. The cylinder body 1 is hollow and is provided with an upper hydraulic cavity 15 and a lower hydraulic cavity 16 on both sides of the force protrusion 52, wherein the upper hydraulic cavity 15 is located above the lower hydraulic cavity 16.

[0041] The cylinder body 1 is provided with a first hydraulic flow channel 11 and a second hydraulic flow channel 12 which are used to communicate with the upper hydraulic cavity 15 and the lower hydraulic cavity 16, respectively. The first hydraulic flow channel 11 is located above the second hydraulic flow channel 12. The O-type servo valve is used to communicate the first hydraulic flow channel 11 and the second hydraulic flow channel 12. When the O-type servo valve is closed, the first hydraulic flow channel 11 and the second hydraulic flow channel 12 are disconnected from the external hydraulic station. When the O-type servo valve is working, the first hydraulic flow channel 11 and the second hydraulic flow channel 12 are connected to the external hydraulic station through an oil circuit, and the O-type servo valve is used to switch the oil circuit.

[0042] When the test requires super-low-frequency large-displacement excitation, at this time, the vibration test bench is equivalent to an electro-hydraulic vibration table, and the external hydraulic station supplies oil to the oil circuit. After receiving the signal from the controller, the O-type servo valve changes the direction of the valve core to make the first hydraulic flow channel 11 and the second hydraulic flow channel 12 reciprocate to supply oil, so that the hydraulic oil in the upper hydraulic cavity 15 and the lower hydraulic cavity 16 changes constantly to drive the force protrusion 52 to move in the axial direction, thereby achieving the effect of driving the piston 5 to reciprocate.

[0043] During the electro-hydraulic servo vibration process, we need to electrify, and the O-type servo valve is needed to ensure that the oil circuit always maintains a pressure accumulation state, so it is not suitable to select the servo valve connected by the ABPT in the middle position. However, this will cause the pressure in the upper hydraulic cavity 15 and the lower hydraulic cavity 16 to be constant when high-frequency high-acceleration excitation is required, so the electromagnetic force cannot be used to drive the piston 5 to move in the axial direction.

[0044] Therefore, in the embodiment, the cylinder body 1 is further provided with a third hydraulic flow channel 13 and a fourth hydraulic flow channel 14 which are used to communicate with the upper hydraulic cavity 15 and the lower hydraulic cavity 16, respectively. The on-off valve is used to communicate the third hydraulic flow channel 13 and the fourth hydraulic flow channel 14. When the on-off valve is closed, the third hydraulic flow channel 13 and the fourth hydraulic flow channel 14 are connected to the external hydraulic station. When the on-off valve is working, the third hydraulic flow channel 13 and the fourth hydraulic flow channel 14 are disconnected from the external hydraulic station. When the O-type servo valve is working, the on-off valve is working. In the embodiment, the number of on-off valves is two, and the hydraulic station has two independent oil return pipelines which are directly connected to the two on-off valves, and then the on-off valves are respectively connected to the third hydraulic flow channel 13 and the fourth hydraulic flow channel 14.

[0045] In the embodiment, the opening and closing of the on-off valve are controlled to realize the switching of electromagnetic and electro-hydraulic excitation, which is simple in principle and strong in practicability.

[0046] The magnetic cylinder ring 2 is provided with a heat dissipation flow channel 22 facing the excitation element 21, and the connecting flow channels 8 are arranged in an array around the cylinder body 1. In this embodiment, there are eight connecting flow channels 8.

[0047] The two end covers 6 are respectively communicated with the heat dissipation flow channels 22 on the two magnetic cylinder rings 2, one of the two end covers 6 is provided with an air inlet 61, and the other end cover 6 is provided with an air outlet 62.

[0048] When high-frequency high-acceleration excitation occurs, the excitation element 21 generates heat, and the external fan performs forced air cooling. Specifically, the air enters the upper end cover 6, passes through the heat dissipation flow channel 22 on the upper magnetic cylinder ring 2, passes through the excitation element 21, and then flows to the heat dissipation flow channel 22 of the lower magnetic cylinder ring 2 through the connecting flow channel 8, and is then extracted by the fan after passing through the excitation element 21. The heat dissipation flow channel 22 and the connecting flow channel 8 do not pass through the middle oil circuit, and do not affect the oil temperature. Multiple connecting flow channels 8 are provided to disperse heat and forcibly concentrate air extraction, and the cooling effect is obvious.

[0049] As shown in FIG. 4, the static pressure support assembly 7 includes a guide sleeve 71 abutting the piston 5 in the radial direction, a guide sleeve 71 provided on the guide sleeve 71 near one side of the magnetic cylinder ring 2 to abut the piston 5, a throttle 73, and a dustproof gland 77. The side of the guide sleeve 71 near the piston 5 ring is recessed with a static pressure cavity 74 and an oil return cavity 75 communicated with the static pressure cavity 74, the throttle 73 and the static pressure cavity 74 are connected through a static pressure channel 76, and the cylinder body 1 is provided with a oil supply flow channel 17 communicated with the throttle 73. The oil return cavity 75 is communicated with the hydraulic station to realize the effect of returning oil.

[0050] The dustproof gland 77 is arranged between the guide sleeve 71 and the magnetic cylinder bottom 3, and the dustproof gland 77 is provided with a dustproof ring 78 abutting the piston 5 to prevent dust from entering the oil circuit.

[0051] The guide sleeve 71 can prevent hydraulic oil from entering the magnetic cylinder ring 2.

[0052] The static pressure support assembly 7 is independently arranged, which breaks through the traditional feature of weak anti-unbalance torque of the vibration table.

[0053] The hydraulic station can supply oil to the static pressure support assembly 7. In this embodiment, the O-type servo valve, the on-off valve and the static pressure support assembly 7 all need to be supplied with hydraulic oil by the hydraulic station. Multiple hydraulic stations can be provided, or the same hydraulic station can be shared. This embodiment is not limited.

[0054] In this embodiment, the controller can control the operation of the on-off valve and the O-type servo valve, and can also control the operation of the hydraulic station to supply oil to the static pressure support assembly 7.

[0055] As shown in FIG. 6, the working method of the electromagnetic electro-hydraulic composite vibration device 100 has at least two working modes, including:

[0056] High-frequency high-acceleration excitation mode: the excitation piece 21 is supplied with direct current, the drive coil 51 is supplied with alternating current, the O-shaped servo valve is closed, the first hydraulic flow channel 11 and the second hydraulic flow channel 12 are disconnected with the external hydraulic station, the on-off valve is closed, the third hydraulic flow channel 13 and the fourth hydraulic flow channel 14 are connected with the external hydraulic station;

[0057] Ultra-low frequency large displacement excitation mode: the excitation piece 21 and the drive coil 51 are not supplied with electricity, the O-shaped servo valve works, the first hydraulic flow channel 11 and the second hydraulic flow channel 12 are connected with the external hydraulic station, the on-off valve works, the third hydraulic flow channel 13 and the fourth hydraulic flow channel 14 are disconnected with the external hydraulic station.

[0058] In the high-frequency high-acceleration excitation mode and the ultra-low frequency large displacement excitation mode, the static pressure support assembly 7 is supplied with oil through the hydraulic station.

[0059] The electromagnetic electro-hydraulic composite vibration device 100 and the vibration table thereof can realize electromagnetic vibration and electro-hydraulic vibration on one vibration table, have wide frequency width, and have lower independent operation cost and smaller occupied area than two sets of equipment.

[0060] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not contradict each other, they should be considered as the scope of the present disclosure.

[0061] The above-described embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be pointed out that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. An electromagnetic electrohydraulic hybrid vibration device, characterized by: The electromagnetic electro-hydraulic composite vibration device comprises a cylinder body, a magnetic cylinder ring arranged on the side of the cylinder body in the axial direction, and a piston penetrating through the cylinder body in the axial direction, the magnetic cylinder ring is provided with an excitation element, the piston is provided with a driving coil, the middle part of the piston is provided with a stress protrusion which protrudes outward in the axial direction, the stress protrusion is in radial resistance with the cylinder body, the driving coil is used to drive the piston to move in the axial direction in cooperation with the excitation element, the hollow cylinder body is provided with an upper hydraulic chamber and a lower hydraulic chamber which are located on both sides of the stress protrusion, and the cylinder body is provided with a first hydraulic flow channel and a second hydraulic flow channel which are used to communicate with the upper hydraulic chamber and the lower hydraulic chamber respectively.

2. The electro-magnetic electro-hydraulic hybrid vibration device of claim 1, wherein: The electromagnetic electro-hydraulic composite vibration device further comprises an O-type servo valve which communicates the first hydraulic flow channel and the second hydraulic flow channel, when the O-type servo valve is closed, the first hydraulic flow channel and the second hydraulic flow channel are disconnected with the external hydraulic station, and when the O-type servo valve works, the first hydraulic flow channel and the second hydraulic flow channel are in communication with the external hydraulic station.

3. The electro-magnetic electro-hydraulic hybrid vibration device of claim 2, wherein: The cylinder body is further provided with a third hydraulic flow channel and a fourth hydraulic flow channel which are used to communicate with the upper hydraulic chamber and the lower hydraulic chamber respectively, the electromagnetic electro-hydraulic composite vibration device further comprises an on-off valve which communicates the third hydraulic flow channel and the fourth hydraulic flow channel, when the on-off valve is closed, the third hydraulic flow channel and the fourth hydraulic flow channel are in communication with the external hydraulic station, when the on-off valve works, the third hydraulic flow channel and the fourth hydraulic flow channel are disconnected with the external hydraulic station, and when the O-type servo valve works, the on-off valve works; when the excitation element and the driving coil are electrified, the O-type servo valve is closed, and the on-off valve is closed.

4. The electro-magnetic electro-hydraulic hybrid vibration device of claim 1, wherein: The electromagnetic electro-hydraulic composite vibration device further comprises a magnetic cylinder bottom arranged between the cylinder body and the magnetic cylinder ring and a magnetic cylinder cover arranged on the side of the magnetic cylinder ring away from the cylinder body.

5. The electro-magnetic electro-hydraulic hybrid vibration device of claim 1, wherein: The number of the magnetic cylinder rings is two, and the two magnetic cylinder rings are arranged at the two ends of the cylinder body in the axial direction respectively.

6. The electro-magnetic electro-hydraulic hybrid vibration device of claim 5, wherein: Two excitation elements are arranged in each magnetic cylinder ring and are arranged in the axial direction at intervals.

7. The electromagnetic electro-hydraulic hybrid vibration apparatus of claim 5, wherein: A heat dissipation flow channel is arranged on the magnetic cylinder ring and faces the excitation element, the electromagnetic electro-hydraulic composite vibration device further comprises a connecting flow channel which communicates the heat dissipation flow channels on both sides, and the number of the connecting flow channels is multiple, and the multiple connecting flow channels are arranged in an array around the cylinder body.

8. The electro-magnetic electro-hydraulic hybrid vibration apparatus of claim 7, wherein: The electromagnetic electro-hydraulic composite vibration device further comprises a cover arranged on the side of the magnetic cylinder ring away from the cylinder body, the covers at both ends are in communication with the heat dissipation flow channels on the magnetic cylinder rings on both sides respectively, one of the covers is provided with an air inlet, and the other cover is provided with an air outlet.

9. The electromagnetic electro-hydraulic compound vibration device of claim 1, wherein: The electromagnetic electro-hydraulic composite vibration device further comprises a static pressure support assembly, the static pressure support assembly comprises a guide sleeve in radial resistance with the piston, a guide sleeve provided on the side of the guide sleeve close to the magnetic cylinder ring and in resistance with the piston, and a restrictor, the side of the guide sleeve close to the piston ring is concave with a static pressure chamber and an oil return chamber in communication with the static pressure chamber, the restrictor and the static pressure chamber are connected through a static pressure channel, and the cylinder body is provided with an oil supply flow channel in communication with the restrictor.

10. A method of operating an electromagnetic electrohydraulic hybrid vibration device as claimed in any one of claims 1-9, characterized in that: The working method of the electromagnetic electro-hydraulic composite vibration device has at least two working modes, which comprises: High-frequency high-acceleration excitation mode: the excitation member is connected with DC power, the drive coil is connected with AC power, the O-type servo valve is closed, the first and second hydraulic flow channels are disconnected with the external hydraulic station, the on-off valve is closed, and the third and fourth hydraulic flow channels are connected with the external hydraulic station; Ultra-low-frequency large-displacement excitation mode: the excitation member and the drive coil are not connected with power, the O-type servo valve works, the first and second hydraulic flow channels are connected with the external hydraulic station, the on-off valve works, and the third and fourth hydraulic flow channels are disconnected with the external hydraulic station.

11. The method of operating an electromagnetic electrohydraulic hybrid vibration device according to claim 10, wherein: In the high-frequency high-acceleration excitation mode and the ultra-low-frequency large-displacement excitation mode, the hydraulic station supplies oil to the static pressure support assembly.

12. A vibration test rig characterised in that: The vibration test bench comprises the electromagnetic electro-hydraulic composite vibration device according to any one of claims 1-9.

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