JP2021124291A - Vibration device and vibration tester - Google Patents

Abstract

To provide a vibration device and a vibration tester, with which it is possible to suppress seizure in a cylinder.SOLUTION: The vibration device comprises: a cylindrical cylinder; a land arranged inside of the cylinder, for partitioning the inside of the cylinder in the axial direction of the center axis of the cylinder into two pressure chambers; a rod extending from the land in one direction of the two pressure chambers, protruding to the outside of the cylinder from an axial end and getting integrally connected to a vibration table on which a vibration object is placeable; and a hydraulic oil drive mechanism for supplying and collecting a hydraulic oil to and from the two pressure chambers. The land has a supply passage for supplying a hydraulic oil of at least one of the first and second pressure chambers of the cylinder to a space between the inner circumferential surface of the cylinder and the counterpart and a discharge passage for discharging the hydraulic oil supplied to the space so as to be arranged on the inner circumferential surface of the cylinder by being spaced apart by a prescribed clearance.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to a vibration exciter and a vibration test device.

A vibration test device that vibrates a shaking table on which an object is placed by a vibration device is known (see, for example, Patent Document 1). In such a vibration test device, for example, by using a single rod type vibration device as shown in Patent Document 2, it is required to shorten the total length of the vibration device and suppress the increase in size of the equipment.

Japanese Unexamined Patent Publication No. 58-71430 JP-A-2010-54204

In a single-rod type exciter, the rod extends from a land in the cylinder in one axial direction of the cylinder and protrudes from one end of the cylinder. In this configuration, a bearing that receives the rod can be arranged at one end of the cylinder, but it is difficult to arrange the bearing on the land side. Therefore, the rod and the land may move in the axial direction, so that the inner peripheral surface of the cylinder and the land may come into contact with each other. If the land and rod move in the cylinder in this state, so-called seizure may occur due to friction between the inner peripheral surface of the cylinder and the land.

The present disclosure has been made in view of the above, and an object of the present disclosure is to provide a vibration exciter and a vibration test device capable of suppressing seizure in a cylinder.

The vibration exciter according to the present disclosure includes a tubular cylinder, a land arranged inside the cylinder and partitioning the inside of the cylinder into two pressure chambers in the axial direction of the central axis of the cylinder, and two lands from the land. A rod extending toward one of the pressure chambers, projecting from the axial end to the outside of the cylinder, and integrally connected to a shaking table on which an object to be excited can be placed, and two pressure chambers. On the other hand, the land is provided with a hydraulic oil drive mechanism for supplying and recovering hydraulic oil, and the first pressure of the cylinder is arranged so that the land is arranged with a predetermined gap with respect to the inner peripheral surface of the cylinder. A supply flow path for supplying the hydraulic oil at least one of the chamber and the second pressure chamber to a gap portion between the inner peripheral surface of the cylinder and a discharge flow path for discharging the hydraulic oil supplied to the gap portion. Has.

The vibration exciter according to the present disclosure includes a tubular cylinder, a land arranged inside the cylinder and partitioning the inside of the cylinder into two pressure chambers in the axial direction of the central axis of the cylinder, and two lands from the land. Supply and recovery of hydraulic oil to the rod and the two pressure chambers, which extend toward one of the pressure chambers and project from the axial end to the outside of the cylinder and are integrally connected to the shaking table. The hydraulic oil drive mechanism is provided, and the hydraulic oil drive mechanism connects the pump for driving the hydraulic oil and the first pressure chamber of the two pressure chambers in which the rod is arranged. A first flow path capable of constantly supplying the hydraulic oil to the first pressure chamber by driving the pump, a second flow path branched from the first flow path, and the first of the two pressure chambers. A third flow path connected to a second pressure chamber different from the pressure chamber, a fourth flow path connected to the hydraulic oil discharge part, and a branch from the third flow path and connected to the discharge part. A first connection state in which the fifth flow path, the orifice provided in the fifth flow path, and at least the second flow path and the third flow path are connected to close the fourth flow path, and the above. It has a servo valve capable of switching between a second connection state in which the third flow path and the fourth flow path are connected and the second flow path is closed.

The vibration test apparatus according to the present disclosure includes a base portion, the vibration device supported by the base portion, and a shaking table integrally connected to the rod of the vibration device.

According to the present invention, it is possible to provide a vibration exciter and a vibration test device capable of suppressing seizure in a cylinder.

FIG. 1 is a diagram showing an example of a vibration test device according to the present embodiment. FIG. 2 is a diagram showing an example of a vibration exciter. FIG. 3 is a diagram showing an example of the internal structure of the actuator.

Hereinafter, embodiments of the vibration exciter and the vibration test apparatus according to the present invention will be described with reference to the drawings. The present invention is not limited to this embodiment. In addition, the components in the following embodiments include those that can be easily replaced by those skilled in the art, or those that are substantially the same.

FIG. 1 is a diagram showing an example of a vibration test device 100 according to the present embodiment. The vibration test device 100 includes a base portion 10, a vibration device 20, and a shaking table 30.

The base portion 10 is placed on a horizontal floor surface or the like. The base portion 10 has a rectangular parallelepiped recess 11. A vibrating device 20 and a shaking table 30 are housed inside the recess 11.

The vibration exciter 20 is supported by the recess 11 of the base portion 10. The vibrating device 20 is connected to the shaking table 30 and applies vibration to the shaking table 30. The vibration test device 100 is provided with a vibration device 20 that applies vibration in the vertical direction and a vibration device 20 that applies vibration in the horizontal direction. The detailed configuration of the vibration exciter 20 will be described later.

On the shaking table 30, a vibration target object 101 such as a structure to be subjected to a vibration test can be placed. The shaking table 30 vibrates in the vertical direction and the horizontal direction by the vibrating device 20. In the present embodiment, the vibration test device 100 can vibrate the vibrating object 101 mounted on the vibrating table 30 by vibrating the vibrating table 30.

FIG. 2 is a diagram showing an example of the vibration exciter 20. The vibration device 20 shown in FIG. 2 can be applied to both a vibration device that applies vibration in the vertical direction and a vibration device that applies vibration in the horizontal direction. As shown in FIG. 2, the vibration exciter 20 includes an actuator AC, a hydraulic oil discharge pipe 24, a connecting portion 25, and a hydraulic oil drive mechanism 26.

The actuator AC has a cylinder 21, a land 22, and a rod 23. The cylinder 21, land 22 and rod 23 are formed using, for example, a metal material.

The cylinder 21 is formed in a cylindrical shape centered on, for example, a predetermined central axis AX (see FIG. 3). The cylinder 21 extends in the axial direction of the central axis AX. Inside the cylinder 21, a columnar space having a predetermined length in the axial direction is formed. The internal cross section of the cylinder 21 due to a plane perpendicular to the axial direction is, for example, circular, and the cross-sectional area of this circular cross section is constant in the axial direction.

The land 22 is arranged inside the cylinder 21. The land 22 is formed in a columnar shape, for example, and is arranged so that the central axis coincides with the central axis AX of the cylinder 21. The land 22 divides the inside of the cylinder 21 into two pressure chambers, that is, a first pressure chamber S1 and a second pressure chamber S2 in the axial direction of the central axis AX. The land 22 has a first end surface 22a facing the first pressure chamber S1 and a second end surface 22b facing the second pressure chamber S2. The area (pressure receiving area) of the first end surface 22a is smaller than that of the second end surface 22b. In other words, the second end surface 22b has a larger area (pressure receiving area) than the first end surface 22a. The configuration of the land 22 will be described later.

The rod 23 extends from the land 22 toward one of the pressure chambers. In this embodiment, the rod 23 extends from the land 22 toward the first pressure chamber S1. The rod 23 projects from the end of the cylinder 21 on the first pressure chamber S1 side and is connected to the connecting portion 25. The connecting portion 25 is connected to the shaking table 30.

The hydraulic oil discharge pipe 24 discharges the hydraulic oil discharged from the actuator AC. The hydraulic oil discharge pipe 24 is connected to the end of the cylinder 21 on the second pressure chamber S2 side. The detailed configuration of the hydraulic oil discharge pipe 24 will be described later.

The hydraulic oil drive mechanism 26 supplies and recovers hydraulic oil to the two pressure chambers of the first pressure chamber S1 and the second pressure chamber S2. The hydraulic oil drive mechanism 26 includes a pump P, a supply flow path 60, a first flow path 61, a second flow path 62, a third flow path 63, a fourth flow path 64, a servo valve V, and the like. It has a fifth flow path 65, a sixth flow path 66, a seventh flow path 67, an orifice 68, an accumulator 69, and a hydraulic oil tank 70. The supply flow path 60, the first flow path 61, the second flow path 62, the third flow path 63, the fourth flow path 64, the fifth flow path 65, the sixth flow path 66, and the seventh flow path 67 are, for example, pipes. Etc.

The pump P is a drive source for driving the hydraulic oil. The pump P is connected between the supply flow path 60 and the first flow path 61. The pump P is driven so that the hydraulic oil flows from the supply flow path 60 toward the first flow path 61.

The supply flow path 60 connects between the hydraulic oil tank 70 and the pump P. The supply flow path 60 allows hydraulic oil to flow from the hydraulic oil tank 70 to the pump P.

The first flow path 61 connects the pump P and the first pressure chamber S1. The first flow path 61 circulates hydraulic oil between the pump P and the first pressure chamber S1. By driving the pump P, hydraulic oil is constantly supplied to the first pressure chamber S1.

The second flow path 62 is branched from the first flow path 61 and is connected to the servo valve V.

The third flow path 63 connects between the servo valve V and the second pressure chamber S2. The third flow path 63 allows hydraulic oil to flow between the servo valve V and the second pressure chamber S2.

The fourth flow path 64 connects between the hydraulic oil tank 70 and the servo valve V. The end of the fourth flow path 64 on the hydraulic oil tank 70 side is open. The fourth flow path 64 circulates hydraulic oil from the servo valve V toward the hydraulic oil tank 70.

As the servo valve V, for example, a three-way valve is used. The servo valve V connects the first connection state V1 that connects the second flow path 62 and the third flow path 63 to block the fourth flow path 64, and connects the third flow path 63 and the fourth flow path 64. The second connection state V2 that closes the second flow path 62 and the third connection state V3 that closes the second flow path 62, the third flow path 63, and the fourth flow path 64 can be switched.

The fifth flow path 65 is branched from the third flow path 63 and is connected to the hydraulic oil tank 70. The end of the fifth flow path 65 on the hydraulic oil tank 70 side is open. The fifth flow path 65 circulates a part of the hydraulic oil discharged from the second pressure chamber S2 toward the hydraulic oil tank 70.

The sixth flow path 66 connects between the hydraulic oil discharge pipe 24 and the hydraulic oil tank 70. The sixth flow path 66 circulates the hydraulic oil discharged from the hydraulic oil discharge pipe 24 toward the hydraulic oil tank 70.

The seventh flow path 67 is branched from the first flow path 61 and is connected to the accumulator 69.

The orifice 68 is provided in the fifth flow path 65. By providing the fifth flow path 65 and the orifice 68, oscillation in the actuator AC can be suppressed when hydraulic oil is supplied and discharged to the actuator AC at high speed.

The accumulator 69 adjusts the pressure of the first flow path 61 via the seventh flow path 67.

The hydraulic oil tank 70 stores hydraulic oil. In the present embodiment, the hydraulic oil tank 70 functions as a supply source 71 for supplying hydraulic oil, and collects hydraulic oil discharged from the fourth flow path 64, the fifth flow path 65, and the sixth flow path 66. It has a function as a collection unit 72. In this configuration, the hydraulic oil can be circulated, so that the hydraulic oil can be used efficiently. The supply source 71 and the collection unit 72 may be provided separately.

The operation of the actuator AC and the hydraulic oil drive mechanism 26 will be described with reference to FIG. When the operation of the pump P is stopped, the servo valve V can be in the third connected state V3. By operating the pump P, the hydraulic oil flows from the hydraulic oil tank 70 through the supply flow path 60. This hydraulic oil flows from the supply flow path 60 to the first flow path 61 via the pump P, and is supplied to the first pressure chamber S1 of the cylinder 21. In this way, the hydraulic oil is constantly supplied to the first pressure chamber S1 while the pump P operates.

Here, for example, when the servo valve V is set to the first connection state V1, the second flow path 62 and the third flow path 63 are connected. Therefore, the hydraulic oil flowing through the first flow path 61 flows into the second flow path 62 and is supplied to the second pressure chamber S2 of the cylinder 21 via the servo valve V and the third flow path. Further, as described above, the hydraulic oil flowing through the first flow path 61 is supplied to the first pressure chamber S1 of the cylinder 21. In this case, hydraulic oil is supplied to the first pressure chamber S1 and the second pressure chamber S2 at the same pressure. In the land 22, the pressure receiving area of the second end surface 22b is larger than that of the first end surface 22a. Therefore, the force acting on the second end surface 22b becomes larger than the force acting on the first end surface 22a, and the land 22 moves to the first pressure chamber S1 side. The hydraulic oil for which the volume of the first pressure chamber S1 is reduced by the movement of the land 22 is stored in the accumulator 69 via, for example, the first flow path 61. When the hydraulic oil is supplied from the third flow path 63 to the second pressure chamber S2, a part of the hydraulic oil flows into the fifth flow path 65 branching from the third flow path 63. This hydraulic oil is discharged to the hydraulic oil tank 70 through the orifice 68 provided in the fifth flow path 65. A part of the hydraulic oil flowing through the third flow path 63 flows into the fifth flow path 65 having the orifice 68, so that, for example, when the hydraulic oil is supplied to and discharged from the second pressure chamber S2 at high speed, the second pressure is applied. The change in pressure in the chamber S2 can be mitigated. As a result, the oscillation of the land 22 can be suppressed.

Further, for example, when the servo valve V is set to the second connection state V2, the hydraulic oil is not supplied to the second pressure chamber S2 because the second flow path 62 is connected to the fourth flow path 64. On the other hand, since the third flow path 63 and the fourth flow path 64 are connected, the second pressure chamber S2 is opened to the hydraulic oil tank 70 via the third flow path 63 and the fourth flow path 64. Further, as described above, the hydraulic oil flowing through the first flow path 61 is supplied to the first pressure chamber S1 of the cylinder 21. Therefore, the pressure acting on the second end surface 22b becomes larger than the pressure acting on the first end surface 22a, and the land 22 moves to the second pressure chamber S2 side. The hydraulic oil in the second pressure chamber S2 is discharged to the hydraulic oil tank 70 via the third flow path 63 and the fourth flow path 64.

When the land 22 moves to the first pressure chamber S1, the rod 23 moves integrally with the land 22 and pushes out the shaking table 30. When the land 22 moves to the second pressure chamber S2 side, the rod 23 moves integrally with the land 22 and pulls the shaking table 30. By reciprocating the land 22 in the cylinder 21 in this way, the shaking table 30 can be vibrated in the vertical direction or the horizontal linear direction.

FIG. 3 is a diagram showing an example of the internal structure of the actuator AC. In FIG. 3, the configuration of the connection portion with the first flow path 61 and the third flow path 63 is omitted.

As shown in FIG. 3, the cylinder 21 has a cylindrical shape and has a first end portion 21a, a second end surface 22b, and an inner peripheral surface 21c.

The land 22 is housed in the cylinder 21 and is arranged so that the outer peripheral surface (land outer peripheral surface) 22c faces the inner peripheral surface 21c of the cylinder 21 with a gap portion D. The first end surface 22a of the land 22 faces the first pressure chamber S1 and the rod 23 projects. The second end surface 22b of the land 22 faces the second pressure chamber S2, and the hydraulic oil discharge pipe 24 extends out. The first end surface 22a and the second end surface 22b are, for example, planar. Further, a seal portion 22h is provided on the outer peripheral surface 22c of the land 22. The seal portion 22h is formed by using, for example, a resin material or the like. The seal portion 22h comes into contact with the inner peripheral surface 21c of the cylinder 21 and seals between the first pressure chamber S1 and the second pressure chamber S2. The land 22 is provided with an internal space 22i. The internal space 22i communicates with the inside of the land 22 and the rod 23. The internal space 22i extends from the inside of the rod 23 to the inside of the land 22 along the axial direction of the central axis AX.

Further, inside the land 22, a supply flow path 22s is provided from the first end surface 22a to the outer peripheral surface 22c. The supply flow path 22s supplies the hydraulic oil in the first pressure chamber S1 to the gap portion D. An orifice 22f is provided in the supply flow path 22s. A supply port 22e for discharging hydraulic oil is provided on the outer peripheral surface 22c. The supply port 22e is arranged at the center of the outer peripheral surface 22c in the axial direction, for example.

In the present embodiment, the hydraulic oil from the pump P is constantly supplied to the first pressure chamber S1. Therefore, the first pressure chamber S1 is always in a state where pressure is applied when the pump P is driven. By providing the supply flow path 22s in the land 22, the hydraulic oil in the first pressure chamber S1 flows through the supply flow path 22s and is supplied to the gap portion D by the above pressure. The hydraulic oil supplied to the gap portion D prevents the outer peripheral surface 22c and the inner peripheral surface 21c of the cylinder 21 from being close to each other in the gap portion D. That is, a hydrostatic bearing can be formed between the outer peripheral surface 22c and the inner peripheral surface 21c by using hydraulic oil. A force on the shaking table 30 side may act on the land 22 via the rod 23 and be pushed toward the inner peripheral surface 21c side of the cylinder 21. In the present embodiment, this force can be received by the hydraulic oil supplied to the gap portion D, and the contact between the land 22 and the cylinder 21 can be suppressed. By suppressing the contact between the land 22 and the cylinder 21, friction between the land 22 and the cylinder 21 can be avoided when the land 22 moves in the axial direction, so that the occurrence of seizure can be prevented. A supply flow path may be provided from the second end surface 22b on the second pressure chamber S2 side to the outer peripheral surface 22c. In this configuration, when the hydraulic oil is supplied to the second pressure chamber S2 side, the hydraulic oil can be supplied to the gap portion D.

The outer peripheral surface 22c of the land 22 is provided with collection ports 22g on both sides of the supply port 22e in the axial direction. The collection port 22g is connected to the discharge flow path 22d. The discharge flow path 22d is provided from the outer peripheral surface 22c of the land to the inner peripheral surface 22j of the internal space 22i. The hydraulic oil supplied to the gap portion D flows into the internal space 22i via the recovery port 22g and the discharge flow path 22d. Since the hydraulic oil supplied to the gap portion D is discharged through the discharge flow path 22d, the hydraulic oil can be efficiently recovered.

The hydraulic oil discharge pipe 24 is inserted into the internal space 22i of the land 22. One end of the hydraulic oil discharge pipe 24 penetrates the second end surface 22b side of the land 22 and is inserted into the internal space 22i, and the other end is held by the second end portion 21b of the cylinder 21. The internal space 22i is arranged in a state of extending toward the rod 23 so as not to interfere with the hydraulic oil discharge pipe 24 when the land 22 moves in the cylinder 21. The hydraulic oil discharge pipe 24 is held between the land 22 and the hydraulic oil discharge pipe 24 via, for example, an O-ring 24b. As a result, the land 22 and the hydraulic oil discharge pipe 24 can move relatively in the axial direction, and the space between the internal space 22i and the second pressure chamber S2 is sealed. The hydraulic oil discharge pipe 24 has a suction port 24a for sucking the hydraulic oil at the end on the internal space 22i side. The hydraulic oil recovered from the gap portion D into the internal space 22i flows into the hydraulic oil discharge pipe 24 from the suction port 24a. The hydraulic oil that has flowed into the hydraulic oil discharge pipe 24 flows out to the outside of the cylinder 21 via the hydraulic oil discharge pipe 24, and is discharged to the hydraulic oil tank 70 via the sixth flow path 66.

As described above, the vibration exciter 20 according to the present embodiment is arranged inside the cylindrical cylinder 21 and the cylinder 21, and divides the inside of the cylinder 21 into two pressure chambers in the axial direction of the central axis of the cylinder 21. A rod extending from the land 22 toward the first pressure chamber S1 and projecting from the axial end to the outside of the cylinder 21 and integrally connected to a shaking table 30 on which the vibration target 101 can be placed. 23 and a hydraulic oil drive mechanism 26 for supplying and recovering hydraulic oil to the two pressure chambers are provided, and the land 22 is arranged with a predetermined gap D with respect to the inner peripheral surface of the cylinder 21. As described above, in the supply flow path 22s for supplying the hydraulic oil of at least one of the first pressure chamber S1 and the second pressure chamber S2 of the cylinder 21 to the gap portion D with the inner peripheral surface of the cylinder 21, and the gap portion D. It has a discharge flow path 22d for discharging the supplied hydraulic oil.

Therefore, the hydraulic oil supplied to the gap portion D can prevent the land 22 from coming into contact with the cylinder 21. By suppressing the contact between the land 22 and the cylinder 21, friction between the land 22 and the cylinder 21 can be avoided when the land 22 moves in the axial direction, so that the occurrence of seizure can be prevented. Further, by discharging the hydraulic oil from the gap portion D through the discharge flow path 22d, the hydraulic oil can be efficiently recovered.

Further, in the vibration device 20 according to the present embodiment, the land 22 has a land 22 outer peripheral surface facing the inner peripheral surface of the cylinder 21, and the supply flow path 22s lands a supply port 22e for discharging hydraulic oil. It is provided in the central portion of the outer peripheral surface 22c of the 22 in the axial direction, and has collection ports 22g for sucking hydraulic oil on both sides of the outer peripheral surface of the land 22 in the axial direction with respect to the supply port 22e. Therefore, in the gap portion D, the hydraulic oil supplied to the central portion in the axial direction flows to both sides in the axial direction, so that the hydraulic oil can be efficiently supplied to the entire gap portion D.

Further, in the vibration device 20 according to the present embodiment, the land 22 has an internal space 22i connected to the outside of the cylinder 21, and the discharge flow path 22d connects the gap portion D and the internal space 22i. Therefore, the hydraulic oil in the gap portion D can be discharged from the discharge flow path 22d into the internal space 22i. As a result, the hydraulic oil can be efficiently recovered.

Further, in the vibration device 20 according to the present embodiment, the supply flow path 22s connects between the first end surface 22a of the land 22 facing the first pressure chamber S1 and the outer peripheral surface 22c, and is a hydraulic oil driving mechanism. Reference numeral 26 denotes a pump P for driving the hydraulic oil, and the pump P and the first pressure chamber S1 in which the rod 23 is arranged among the two pressure chambers. It has a first flow path 61 that can always be supplied to the chamber S1. Therefore, when the pump P is driven, the pressure due to the hydraulic oil always acts on the first pressure chamber S1. Thereby, when the pump P is driven, the hydraulic oil can be constantly supplied to the gap portion D.

Further, in the vibration device 20 according to the present embodiment, the hydraulic oil drive mechanism 26 is different from the second flow path 62 branched from the first flow path 61 and the first pressure chamber S1 of the two pressure chambers. The third flow path 63 connected to the two pressure chamber S2, the fourth flow path 64 connected to the hydraulic oil discharge part, and the fifth flow path branched from the third flow path 63 and connected to the discharge part. 65, an orifice 68 provided in the fifth flow path 65, a first connection state V1 that connects at least the second flow path 62 and the third flow path 63 and closes the fourth flow path 64, and a third connection state V1. It has a servo valve V capable of switching between a second connection state V2 that connects the flow path 63 and the fourth flow path 64 and closes the second flow path 62. Therefore, a part of the hydraulic oil flowing through the third flow path 63 flows into the fifth flow path 65 having the orifice 68. Therefore, for example, when the servo valve V is switched between the first connection state V1 and the second connection state V2 at high speed and hydraulic oil is supplied to and discharged from the second pressure chamber S2 at high speed, the second pressure chamber S2 Changes in pressure can be mitigated. As a result, the oscillation of the land 22 can be suppressed.

Further, the vibration test device 100 according to the present embodiment includes a base portion 10, the above-mentioned vibration device 20 supported by the base portion, and a shaking table 30 integrally connected to the rod 23 of the vibration device 20. Be prepared. Therefore, it is possible to provide a vibration test device 100 capable of preventing the occurrence of seizure between the land 22 and the cylinder 21 or suppressing the oscillation of the land 22.

The technical scope of the present invention is not limited to the above-described embodiment, and modifications can be made as appropriate without departing from the spirit of the present invention. For example, in the vibration exciting device 20 according to the above embodiment, the configuration in which the hydraulic oil driving mechanism 26 can always supply the hydraulic oil to the first pressure chamber S1 by driving the pump P has been described as an example. Not limited to. The hydraulic oil drive mechanism 26 may be configured to switch between a state in which the hydraulic oil is supplied to the first pressure chamber S1 and a state in which the hydraulic oil is not supplied.

Further, in the vibration apparatus 20 according to the above embodiment, the configuration in which the land 22 has the supply flow path 22s and the discharge flow path 22d has been described as an example, but the present invention is not limited to this. For example, the vibration exciter 20 may have a configuration in which the land 22 does not have the supply flow path 22s and the discharge flow path 22d. In this case, the vibrating device 20 is arranged from the cylindrical cylinder 21 and the land 22 which is arranged inside the cylinder 21 and divides the inside of the cylinder 21 into two pressure chambers in the axial direction of the central axis of the cylinder 21. Supply and recovery of hydraulic oil to the rod 23, which extends toward the first pressure chamber S1 and protrudes from the axial end to the outside of the cylinder 21 and is integrally connected to the shaking table 30, and the two pressure chambers. The hydraulic oil driving mechanism 26 is provided, and the hydraulic oil driving mechanism 26 is located between the pump P for driving the hydraulic oil, the pump P, and the first pressure chamber S1 in which the rod 23 is arranged among the two pressure chambers. Of the two pressure chambers, a first flow path 61 in which hydraulic oil is constantly supplied to the first pressure chamber S1 by driving the pump P, a second flow path 62 branched from the first flow path 61, and two pressure chambers. A third flow path 63 connected to a second pressure chamber S2 different from the first pressure chamber S1, a fourth flow path 64 connected to a hydraulic oil discharge portion, and a branch from the third flow path 63 for discharge. The fifth flow path 65 connected to the portion, the orifice 68 provided in the fifth flow path 65, and at least the second flow path 62 and the third flow path 63 are connected to close the fourth flow path 64. A configuration having a servo valve V capable of switching between a first connection state V1 and a second connection state V2 that connects the third flow path 63 and the fourth flow path 64 and closes the second flow path 62. Become.

Therefore, a part of the hydraulic oil flowing through the third flow path 63 flows into the fifth flow path 65 having the orifice 68. Therefore, for example, when the servo valve V is switched between the first connection state V1 and the second connection state V2 at high speed and hydraulic oil is supplied to and discharged from the second pressure chamber S2 at high speed, the second pressure chamber S2 Changes in pressure can be mitigated. As a result, the oscillation of the land 22 can be suppressed.

10 Base 11 Recessed 20 Vibration device 21 Cylinder 21a First end 21b Second end 21c, 22j Inner peripheral surface 22 Land 22a First end surface 22b Second end surface 22c Outer surface 22d Discharge flow path 22e Supply port 22f, 68 Orifice 22g Recovery port 22h Sealed part 22i Internal space 22s, 22t, 60 Supply flow path 23 Rod 24 Hydraulic oil discharge pipe 24a Suction port 24b O-ring 25 Connecting part 26 Hydraulic oil drive mechanism 30 Shaking table 61 First flow path 62 Second Flow path 63 Third flow path 64 Fourth flow path 65 Fifth flow path 66 Sixth flow path 67 Seventh flow path 69 Accumulator 70 Hydraulic oil tank 71 Supply source 72 Recovery unit 100 Vibration test device AC actuator AX Central axis D Gap Part P Pump S1 1st pressure chamber S2 2nd pressure chamber V Servo valve V1 1st connection state V2 2nd connection state V3 3rd connection state

Claims (7)

Cylindrical cylinder and
A land arranged inside the cylinder and partitioning the inside of the cylinder into two pressure chambers in the axial direction of the central axis of the cylinder.
A rod extending from the land toward one of the two pressure chambers, projecting from the axial end to the outside of the cylinder, and integrally connected to a shaking table on which an object to be vibrated can be placed.
It is equipped with a hydraulic oil drive mechanism that supplies and recovers hydraulic oil to the two pressure chambers.
The land is formed by using the hydraulic oil of at least one of the first pressure chamber and the second pressure chamber of the cylinder so as to be arranged with a predetermined gap from the inner peripheral surface of the cylinder. A vibration exciter having a supply flow path for supplying to a gap portion with an inner peripheral surface and a discharge flow path for discharging the hydraulic oil supplied to the gap portion. The land has a land outer peripheral surface facing the inner peripheral surface of the cylinder.
The supply flow path has a supply port for discharging the hydraulic oil at the center of the outer peripheral surface of the land in the axial direction, and a recovery port for sucking the hydraulic oil is provided at the supply port of the outer peripheral surface of the land. The vibrating device according to claim 1, which is provided on both sides in the axial direction. The land has an internal space connected to the outside of the cylinder.
The vibrating device according to claim 2, wherein the discharge flow path connects the gap portion and the internal space. The supply flow path connects between the first end surface of the land facing the first pressure chamber and the outer peripheral surface of the land.
The hydraulic oil drive mechanism is
The pump that drives the hydraulic oil and
A first flow path that connects between the pump and the first pressure chamber in which the rod is arranged among the two pressure chambers, and can constantly supply the hydraulic oil to the first pressure chamber by driving the pump. The vibrating device according to any one of claims 1 to 3, which has the above. The hydraulic oil drive mechanism is
The second flow path branched from the first flow path and
A third flow path connected to a second pressure chamber different from the first pressure chamber among the two pressure chambers,
The fourth flow path connected to the hydraulic oil discharge part and
A fifth flow path that branches from the third flow path and is connected to the discharge portion,
An orifice portion provided in the fifth flow path and
At least, a first connection state in which the second flow path and the third flow path are connected to close the fourth flow path, and a second flow in which the third flow path and the fourth flow path are connected to each other. The vibrating device according to claim 4, further comprising a servo valve capable of switching between a second connection state for blocking the path. Cylindrical cylinder and
A land arranged inside the cylinder and partitioning the inside of the cylinder into two pressure chambers in the axial direction of the central axis of the cylinder.
A rod extending from the land toward one of the two pressure chambers, projecting from the axial end to the outside of the cylinder, and integrally connected to the shaking table.
It is equipped with a hydraulic oil drive mechanism that supplies and recovers hydraulic oil to the two pressure chambers.
The hydraulic oil drive mechanism is
The pump that drives the hydraulic oil and
A first flow path that connects between the pump and the first pressure chamber in which the rod is arranged among the two pressure chambers, and can constantly supply the hydraulic oil to the first pressure chamber by driving the pump. When,
The second flow path branched from the first flow path and
A third flow path connected to a second pressure chamber different from the first pressure chamber among the two pressure chambers,
The fourth flow path connected to the hydraulic oil discharge part and
A fifth flow path that branches from the third flow path and is connected to the discharge portion,
An orifice portion provided in the fifth flow path and
At least, a first connection state in which the second flow path and the third flow path are connected to close the fourth flow path, and a second flow in which the third flow path and the fourth flow path are connected to each other. A vibration exciter having a servo valve that can switch between a second connection state that blocks the road. With the base part
The vibrating device according to any one of claims 1 to 5, which is supported by the base portion.
A vibration test device including a shaking table integrally connected to the rod of the vibration device.

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