Electromagnetic electro-hydraulic composite vibration device and its use method, vibration table

Abstract

The present invention provides an electromagnetic electro-hydraulic composite vibration device, which includes a cylinder body, a magnetic cylinder ring axially arranged on the side of the cylinder body, and a piston axially penetrating the cylinder body. An excitation component is provided in the magnetic cylinder ring, and a driving coil is provided on the piston. A force-bearing protrusion is provided on the middle part of the piston axially extending outward, and the force-bearing protrusion is radially abutted against the cylinder body. The driving coil is used to cooperate with the excitation component to drive the piston to move axially. The cylinder body is hollow and has an upper hydraulic chamber and a lower hydraulic chamber located on both sides of the force-bearing protrusion. The cylinder body is provided with a first hydraulic flow channel and a second hydraulic flow channel respectively for communicating with the upper hydraulic chamber and the lower hydraulic chamber. The electromagnetic electro-hydraulic composite vibration device of the present invention, its use method, and the vibration table can realize electromagnetic vibration and electro-hydraulic vibration on a single vibration table, and has a wide bandwidth coverage. Compared with two sets of equipment operating independently, the cost is lower and the floor space is smaller.

Description

Technical Field

[0001] The present invention relates to the field of test devices, and in particular to an electromagnetic electro-hydraulic composite vibration device, a use method thereof, and a vibration table. Background Art

[0002] Currently, testing agencies and reliability laboratories, both domestic and international, typically use electromagnetic vibration tables to simulate high-frequency, high-acceleration vibrations, such as blade fatigue testing, satellite vibration testing, and battery pack vibration testing. Electrohydraulic vibration tables are typically used to simulate low-frequency, high-displacement vibrations, such as those encountered in packaging and transportation testing, and earthquake simulation testing of large buildings and high-voltage electrical equipment. Domestic manufacturers specify electromagnetic vibration tables with a range of approximately 2-2500 Hz, displacements of 51 mm and 76 mm, with high standards reaching 100 mm. However, these electromagnetic vibration tables are unable to meet the requirements for some packaging and transportation tests with displacements exceeding 100 mm, and earthquake simulation tests with 0.5 Hz onset and displacements of 200 mm, 300 mm, or even higher. Domestic manufacturers specify electrohydraulic vibration tables with a range of approximately 0.1-100 Hz, acceleration of 5 g, but these cannot meet the requirements for some high-frequency, high-acceleration vibration tests, such as those involving battery packs.

[0003] In view of this, it is necessary to improve the existing vibration device to solve the above problems. Summary of the Invention

[0004] The object of the present invention is to provide an electromagnetic electro-hydraulic composite vibration device to solve the problem that the existing vibration table cannot integrate the two working modes of electro-hydraulic vibration and electromagnetic vibration.

[0005] To achieve the above-mentioned purpose, the present invention provides an electromagnetic electro-hydraulic composite vibration device, which includes a cylinder body, a magnetic cylinder ring axially arranged on the side of the cylinder body, and a piston axially penetrating the cylinder body. An excitation component is provided in the magnetic cylinder ring, and a driving coil is provided on the piston. A force-bearing protrusion is provided on the middle part of the piston axially extending outward, and the force-bearing protrusion is radially abutted against the cylinder body. The driving coil is used to cooperate with the excitation component to drive the piston to move axially. The cylinder body is hollow and has an upper hydraulic chamber and a lower hydraulic chamber located on both sides of the force-bearing protrusion. The cylinder body is provided with a first hydraulic channel and a second hydraulic channel for communicating with the upper hydraulic chamber and the lower hydraulic chamber respectively.

[0006] As a further improvement of the present invention, the electromagnetic electro-hydraulic composite vibration device also includes an O-type servo valve connecting the first hydraulic channel and the second hydraulic channel. When the O-type servo valve is closed, the first hydraulic channel and the second hydraulic channel are disconnected from the external hydraulic station. When the O-type servo valve is working, the first hydraulic channel and the second hydraulic channel are connected to the external hydraulic station.

[0007] As a further improvement of the present invention, the cylinder body is further provided with a third hydraulic channel and a fourth hydraulic channel respectively for communicating with the upper hydraulic chamber and the lower hydraulic chamber, and the electromagnetic electro-hydraulic composite vibration device also includes an on-off valve connecting the third hydraulic channel and the fourth hydraulic channel. When the on-off valve is closed, the third hydraulic channel and the fourth hydraulic channel are connected to the external hydraulic station. When the on-off valve is working, the third hydraulic channel and the fourth hydraulic channel are disconnected from the external hydraulic station. When the O-type servo valve is working, the on-off valve works; when the excitation component and the drive coil are energized, the O-type servo valve is closed and the on-off valve is closed.

[0008] As a further improvement of the present invention, the electromagnetic electro-hydraulic composite vibration device further includes a magnetic cylinder bottom arranged between the cylinder body and the magnetic cylinder ring, and a magnetic cylinder cover arranged on a side of the magnetic cylinder ring away from the cylinder body.

[0009] As a further improvement of the present invention, the number of the magnetic cylinder rings is two, and the two magnetic cylinder rings are respectively arranged at two ends of the cylinder body along the axial direction.

[0010] As a further improvement of the present invention, two excitation components are provided in each magnetic cylinder ring, and the two excitation components are spaced apart in the axial direction.

[0011] As a further improvement of the present invention, a heat dissipation channel facing the excitation part is opened on the magnetic cylinder ring, and the electromagnetic electro-hydraulic composite vibration device also includes a connecting channel connecting the heat dissipation channels on both sides. The number of the connecting channels is multiple, and the multiple connecting channels are arranged in an array around the cylinder body.

[0012] As a further improvement of the present invention, the electromagnetic electro-hydraulic composite vibration device also includes a cover arranged on the side of the magnetic cylinder ring away from the cylinder body, and the cover at both ends are respectively connected to the heat dissipation channels on the magnetic cylinder rings on both sides, one of the cover covers is provided with an air inlet, and the other cover cover is provided with an air outlet.

[0013] As a further improvement of the present invention, the electromagnetic electro-hydraulic composite vibration device also includes a static pressure support assembly, the static pressure support assembly includes a guide sleeve radially abutting against the piston, a guide sleeve arranged on the guide sleeve close to the magnetic cylinder ring to abut against the piston, and a throttle, the guide sleeve is recessed with a static pressure chamber and an oil return chamber connected to the static pressure chamber on the side close to the piston ring, the throttle and the static pressure chamber are connected through a static pressure channel, and an oil supply channel connected to the throttle is opened on the cylinder body.

[0014] The present invention further provides a method for operating the electromagnetic, electro-hydraulic composite vibration device as described above. The method for operating the electromagnetic, electro-hydraulic composite vibration device has at least two operating modes, including:

[0015] High-frequency and high-acceleration excitation mode: the excitation element is supplied with direct current, the drive coil is supplied with alternating current, the O-type servo valve is closed, the first hydraulic flow channel and the second hydraulic flow channel are disconnected from the external hydraulic station, the on-off valve is closed, and the third hydraulic flow channel and the fourth hydraulic flow channel are connected to the external hydraulic station;

[0016] Ultra-low frequency large displacement excitation mode: the excitation component and the drive coil are not energized, the O-type servo valve is working, the first hydraulic flow channel and the second hydraulic flow channel are connected to the external hydraulic station, the on-off valve is working, and the third hydraulic flow channel and the fourth hydraulic flow channel are disconnected from the external hydraulic station.

[0017] As a further improvement of the present invention, in both the high-frequency and high-acceleration excitation mode and the ultra-low-frequency and large-displacement excitation mode, oil is supplied to the static pressure support assembly through the hydraulic station.

[0018] The present invention also provides a vibration test bench, which includes the electromagnetic electro-hydraulic composite vibration device as described above.

[0019] The beneficial effects of the present invention are: the electromagnetic electro-hydraulic composite vibration device and its use method, and the vibration table of the present invention can realize electromagnetic vibration and electro-hydraulic vibration on one vibration table, and have a wide bandwidth coverage. Compared with two sets of equipment operating independently, the cost is lower and the floor space is smaller. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the electromagnetic electro-hydraulic composite vibration device of the present invention;

[0022] Figure 2 It is a partial cross-sectional structural schematic diagram of the electromagnetic electro-hydraulic composite vibration device of the present invention;

[0023] Figure 3 It is a front cross-sectional structural schematic diagram of the electromagnetic electro-hydraulic composite vibration device of the present invention;

[0024] Figure 4 yes Figure 3 Schematic diagram of the enlarged structure of area A in the middle;

[0025] Figure 5 It is a front structural schematic diagram of the piston of the electromagnetic electro-hydraulic composite vibration device of the present invention;

[0026] Figure 6 It is a schematic diagram of the working method of the electromagnetic electro-hydraulic composite vibration device of the present invention. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] like Figures 1 to 5 As shown, 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, which need to be able to realize complete test functions.

[0031] The electromagnetic electro-hydraulic composite vibration device 100 includes a cylinder body 1, a magnetic cylinder ring 2 axially arranged on the side of the cylinder body 1, 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 axially penetrating the cylinder body 1, a cover 6 arranged on the side of the magnetic cylinder ring 2 away from the cylinder body 1, an O-type servo valve, an on-off valve, a static pressure support assembly 7, a connecting flow channel 8, a hydraulic station and a controller.

[0032] The cylinder body 1 is arranged in the middle for the piston 5 to pass through.

[0033] There are two magnetic cylinder rings 2, which are respectively arranged at the two axial ends of the cylinder body 1. Excitation components 21 are provided in the magnetic cylinder rings 2. In this embodiment, two excitation components 21 are provided in each magnetic cylinder ring 2, and the two excitation components 21 are spaced apart in the axial direction.

[0034] The piston 5 is provided with a drive coil 51. In this embodiment, there are two drive coils 51, one at each end of the piston 5. Each drive coil 51 is configured to correspond to the excitation element 21 within the corresponding magnetic cylinder ring 2. The drive coils 51 are formed by winding enameled wire in the same direction and are formed on the piston 5 through epoxy curing. The drive coils 51 cooperate with the excitation element 21 to drive the piston 5 in the axial direction.

[0035] When the test requires high-frequency and high-acceleration excitation, the vibration test bench is equivalent to an electromagnetic vibration bench. The excitation component 21 is energized to generate a circular magnetic field along the drive coil 51. The drive coil 51 on the piston 5 rod is energized with external alternating current and generates an up and down reciprocating motion under the action of the magnetic field.

[0036] A force-bearing protrusion 52 is axially extended outward from the middle of the piston 5 , and the force-bearing protrusion 52 is radially abutted against the cylinder body 1 . The cylinder body 1 is hollow and has an upper hydraulic chamber 15 and a lower hydraulic chamber 16 located on both sides of the force-bearing protrusion 52 , wherein the upper hydraulic chamber 15 is located above the lower hydraulic chamber 16 .

[0037] The cylinder body 1 is provided with a first hydraulic channel 11 and a second hydraulic channel 12 for communicating with the upper hydraulic chamber 15 and the lower hydraulic chamber 16, respectively. The first hydraulic channel 11 is located above the second hydraulic channel 12. The O-type servo valve is used to connect the first hydraulic channel 11 and the second hydraulic channel 12. When the O-type servo valve is closed, the first hydraulic channel 11 and the second hydraulic channel 12 are disconnected from the external hydraulic station. When the O-type servo valve is in operation, the first hydraulic channel 11 and the second hydraulic channel 12 are connected to the external hydraulic station via an oil circuit, and the O-type servo valve is used to switch the oil circuit.

[0038] When the test requires ultra-low-frequency, large-displacement excitation, the vibration test bench functions as an electro-hydraulic vibration table, with an external hydraulic station supplying oil to the oil circuit. Upon receiving a signal from the controller, the O-type servo valve's spool switches direction, causing the first and second hydraulic channels 11, 12 to supply oil back and forth. This causes the hydraulic oil levels in the upper and lower hydraulic chambers 15, 16 to continuously vary, driving the axial movement of the force-bearing projection 52 and, consequently, the reciprocating motion of the piston 5.

[0039] During electro-hydraulic servo vibration, an O-type servo valve is required to ensure the oil circuit maintains a constant pressure state when power is applied. Therefore, a servo valve with a neutral ABPT connection is not suitable. However, this will result in the upper and lower hydraulic chambers 15 and 16 maintaining constant pressure when high-frequency and high-acceleration vibration is required, making it impossible to rely on electromagnetic force to drive the piston 5 axially.

[0040] Therefore, in this embodiment, the cylinder body 1 is further provided with a third hydraulic channel 13 and a fourth hydraulic channel 14 for communicating with the upper hydraulic chamber 15 and the lower hydraulic chamber 16, respectively. The on-off valve is used to connect the third hydraulic channel 13 and the fourth hydraulic channel 14. When the on-off valve is closed, the third hydraulic channel 13 and the fourth hydraulic channel 14 are connected to the external hydraulic station. When the on-off valve is in operation, the third hydraulic channel 13 and the fourth hydraulic channel 14 are disconnected from the external hydraulic station. When the O-type servo valve is in operation, the on-off valve is in operation. In this embodiment, there are two on-off valves. The hydraulic station has two independent return oil lines directly connected to the two on-off valves, and the on-off valves are then connected one-to-one to the third hydraulic channel 13 and the fourth hydraulic channel 14, respectively.

[0041] In this embodiment, the switching between electromagnetic and electro-hydraulic excitation is achieved by controlling the opening and closing of the on-off valve, which has a simple principle and strong practicality.

[0042] The magnetic cylinder ring 2 is provided with a heat dissipation channel 22 facing the excitation component 21. There are multiple connecting channels 8, which are arranged in an array around the cylinder body 1. In this embodiment, there are eight connecting channels 8.

[0043] The covers 6 at both ends are respectively communicated with the heat dissipation channels 22 on the magnetic cylinder rings 2 on both sides. An air inlet 61 is provided on one of the covers 6 , and an air outlet 62 is provided on the other cover 6 .

[0044] During high-frequency, high-acceleration excitation, the excitation element 21 heats up, and an external fan extracts air for forced cooling. Specifically, air enters along the axially upward cover 6, passes through the heat dissipation channel 22 on the upper magnetic cylinder ring 2, and then flows through the excitation element 21. Then, it flows through the connecting channel 8 to the heat dissipation channel 22 of the lower magnetic cylinder ring 2. After passing through the excitation element 21, it is exhausted by the fan. Neither the heat dissipation channel 22 nor the connecting channel 8 passes through the central oil circuit, thus having no effect on oil temperature. Multiple connecting channels 8 are provided to disperse heat and force concentrated air extraction, resulting in a significant cooling effect.

[0045] like Figure 4As shown, the static pressure support assembly 7 includes a guide sleeve 71 that radially abuts the piston 5, a guide sleeve 71 disposed on the guide sleeve 71 near the magnetic cylinder ring 2 for abutting the piston 5, a throttle 73, and a dust cover 77. The guide sleeve 71 is recessed on the side near the piston 5 ring with a static pressure chamber 74 and an oil return chamber 75 communicating with the static pressure chamber 74. The throttle 73 and the static pressure chamber 74 are connected by a static pressure channel 76. The cylinder body 1 is provided with an oil supply channel 17 communicating with the throttle 73. The oil return chamber 75 is connected to the hydraulic station to achieve an oil return effect.

[0046] The dustproof gland 77 is disposed between the guide sleeve 71 and the magnetic cylinder bottom 3 . A dustproof ring 78 is provided on the dustproof gland 77 to abut against the piston 5 to prevent dust from entering the oil circuit.

[0047] The guide sleeve 71 can prevent the hydraulic oil from entering the magnetic cylinder ring 2.

[0048] The static pressure support assembly 7 is independently provided to overcome the weak anti-eccentric load moment characteristic of the traditional vibration table.

[0049] The hydraulic station can supply oil to the static pressure support assembly 7. In this embodiment, the O-type servo valve, on-off valve and static pressure support assembly 7 all need to be provided with hydraulic oil by the hydraulic station. Multiple hydraulic stations can be set up, or the same hydraulic station can be shared. This embodiment does not impose any restrictions.

[0050] 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.

[0051] like Figure 6 As shown, the electromagnetic electro-hydraulic composite vibration device 100 has at least two working modes, including:

[0052] High-frequency and high-acceleration excitation mode: the excitation element 21 is supplied with direct current, the drive coil 51 is supplied with alternating current, the O-type servo valve is closed, the first hydraulic channel 11 and the second hydraulic channel 12 are disconnected from the external hydraulic station, the on-off valve is closed, and the third hydraulic channel 13 and the fourth hydraulic channel 14 are connected to the external hydraulic station;

[0053] Ultra-low frequency large displacement excitation mode: the excitation component 21 and the drive coil 51 are not energized, the O-type servo valve is working, the first hydraulic channel 11 and the second hydraulic channel 12 are connected to the external hydraulic station, the on-off valve is working, and the third hydraulic channel 13 and the fourth hydraulic channel 14 are disconnected from the external hydraulic station.

[0054] In the two working modes of high-frequency high-acceleration excitation mode and ultra-low-frequency large-displacement excitation mode, oil is supplied to the static pressure support assembly 7 through the hydraulic station.

[0055] The electromagnetic electro-hydraulic composite vibration device 100 and its use method and vibration table of the present invention can realize electromagnetic vibration and electro-hydraulic vibration on one vibration table, and has a wide bandwidth coverage. Compared with two sets of independent operation of the equipment, the cost is lower and the floor space is smaller.

[0056] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. An electromagnetic electro-hydraulic composite vibration device, characterized in that: The electromagnetic electro-hydraulic composite vibration device includes a cylinder body, a magnetic cylinder ring axially arranged on the side of the cylinder body, and a piston axially penetrating the cylinder body. An excitation component is provided in the magnetic cylinder ring, and a driving coil is provided on the piston. A force-bearing protrusion is provided on the middle part of the piston axially extending outward, and the force-bearing protrusion is radially abutted against the cylinder body. The driving coil is used to cooperate with the excitation component to drive the piston to move axially. The cylinder body is hollow and is provided with an upper hydraulic chamber and a lower hydraulic chamber located on both sides of the force-bearing protrusion. The cylinder body is provided with a first hydraulic flow channel and a second hydraulic flow channel respectively used to communicate with the upper hydraulic chamber and the lower hydraulic chamber.

2. The electromagnetic electro-hydraulic composite vibration device according to claim 1, characterized in that: The electromagnetic electro-hydraulic composite vibration device also includes an O-type servo valve connecting the first hydraulic channel and the second hydraulic channel. When the O-type servo valve is closed, the first hydraulic channel and the second hydraulic channel are disconnected from the external hydraulic station. When the O-type servo valve is working, the first hydraulic channel and the second hydraulic channel are connected to the external hydraulic station.

3. The electromagnetic electro-hydraulic composite vibration device according to claim 2, characterized in that: The cylinder body is also provided with a third hydraulic channel and a fourth hydraulic channel respectively used to communicate with the upper hydraulic chamber and the lower hydraulic chamber. The electromagnetic electro-hydraulic composite vibration device also includes an on-off valve connecting the third hydraulic channel and the fourth hydraulic channel. When the on-off valve is closed, the third hydraulic channel and the fourth hydraulic channel are connected to the external hydraulic station. When the on-off valve is working, the third hydraulic channel and the fourth hydraulic channel are disconnected from the external hydraulic station. When the O-type servo valve is working, the on-off valve works; when the excitation component and the drive coil are energized, the O-type servo valve is closed and the on-off valve is closed.

4. The electromagnetic electro-hydraulic composite vibration device according to claim 1, characterized in that: 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 a side of the magnetic cylinder ring away from the cylinder body.

5. The electromagnetic electro-hydraulic composite vibration device according to claim 1, characterized in that: There are two magnetic cylinder rings, which are respectively arranged at two ends of the cylinder body along the axial direction.

6. The electromagnetic electro-hydraulic composite vibration device according to claim 5, characterized in that: Two excitation components are arranged in each magnetic cylinder ring, and the two excitation components are arranged at intervals along the axial direction.

7. The electromagnetic electro-hydraulic composite vibration device according to claim 5, characterized in that: The magnetic cylinder ring is provided with a heat dissipation channel toward the excitation component, and the electromagnetic electro-hydraulic composite vibration device also includes a connecting channel connecting the heat dissipation channels on both sides. There are multiple connecting channels, and the multiple connecting channels are arranged in an array around the cylinder body.

8. The electromagnetic electro-hydraulic composite vibration device according to claim 7, characterized in that: The electromagnetic electro-hydraulic composite vibration device also includes a cover arranged on the side of the magnetic cylinder ring away from the cylinder body, and the cover at both ends is respectively connected to the heat dissipation channels on the magnetic cylinder rings on both sides, one of the cover is provided with an air inlet, and the other cover is provided with an air outlet.

9. The electromagnetic electro-hydraulic composite vibration device according to claim 1, characterized in that: The electromagnetic electro-hydraulic composite vibration device also includes a static pressure support assembly, which includes a guide sleeve that radially abuts against the piston, a guide sleeve arranged on the guide sleeve close to the magnetic cylinder ring to abut against the piston, and a throttle. The guide sleeve is recessed with a static pressure chamber and an oil return chamber connected to the static pressure chamber on the side close to the piston ring. The throttle and the static pressure chamber are connected by a static pressure channel, and an oil supply channel connected to the throttle is opened on the cylinder body.

10. A method for operating the electromagnetic electro-hydraulic composite vibration device according to any one of claims 1 to 9, characterized in that: The electromagnetic electro-hydraulic composite vibration device has at least two working modes, including: High-frequency and high-acceleration excitation mode: the excitation element is supplied with direct current, the drive coil is supplied with alternating current, the O-type servo valve is closed, the first hydraulic flow channel and the second hydraulic flow channel are disconnected from the external hydraulic station, the on-off valve is closed, and the third hydraulic flow channel and the fourth hydraulic flow channel are connected to the external hydraulic station; Ultra-low frequency large displacement excitation mode: the excitation component and the drive coil are not energized, the O-type servo valve is working, the first hydraulic flow channel and the second hydraulic flow channel are connected to the external hydraulic station, the on-off valve is working, and the third hydraulic flow channel and the fourth hydraulic flow channel are disconnected from the external hydraulic station.

11. The operating method of the electromagnetic electro-hydraulic composite vibration device according to claim 10, characterized in that: In the two working modes of high-frequency high-acceleration excitation and ultra-low-frequency large-displacement excitation, oil is supplied to the static pressure support assembly through the hydraulic station.

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

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