JP4809072B2 - Vibration table static pressure supply structure - Google Patents

Description

  The present invention relates to an improvement in a static pressure supply structure that supplies pressurized hydraulic fluid to a hydrostatic bearing that supports a vibration table.

2. Description of the Related Art Conventionally, for example, as a vibration testing machine that vibrates a device under test at a high frequency, there has been provided a vibration table supported by a hydrostatic bearing and reciprocating the vibration table by a hydraulic actuator (see Patent Document 1) ).
Japanese Patent Laid-Open No. 05-107146

  In such a vibration tester, for example, a flexible hydraulic hose may be used to supply the pressurized hydraulic fluid to the hydrostatic bearing of the vibration table.

  However, when the hydraulic hose is connected to the movable part of the vibration table, this hydraulic hose also vibrates with the vibration table, which makes it difficult to maintain the durability of the hydraulic hose.

  The present invention has been made in view of the above problems, and an object thereof is to provide a static pressure supply structure for a vibration table that is not easily affected by vibration.

  The present invention provides a vibration table including a vibration cylinder rod for vibrating a vibration table, a hydrostatic bearing for supporting the vibration table, and a hydrostatic supply passage for supplying pressurized hydraulic fluid to the hydrostatic bearing. In this static pressure supply structure, a relay rod extending in the axial direction of the excitation cylinder rod, a relay cylinder for slidably fitting the relay rod, and an outer peripheral surface of the relay rod and the relay cylinder are defined. The relay oil chamber and the relay rod through-hole penetrating the relay rod, and the static pressure supply passage allows the pressurized hydraulic oil supplied from the hydraulic source to pass through the relay oil chamber and the relay rod through-hole, It was set as the structure introduced into a bearing.

  According to the present invention, the static pressure supply passage is built in the vibration cylinder rod and the relay rod, and the hydraulic hose connected to the movable part is abolished to realize the static pressure supply structure of the vibration table that is less susceptible to vibration. The durability of the vibration table static pressure supply structure can be increased, and maintenance can be facilitated.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  First, FIG. 2 is an exploded perspective view showing an example of a static pressure supply structure of a vibration table provided in a vibration testing machine to which the present invention is applicable.

  In FIG. 2, reference numeral 1 denotes a vibration table. A specimen 10 is placed on the vibration table 1 and the specimen 10 is vibrated with a predetermined amplitude and frequency.

  The vibration tester is provided with a horizontal vibration cylinder rod 2 for driving the vibration table 1 in the horizontal direction and a vertical vibration cylinder rod 3 for driving in the vertical direction as hydraulic actuators. The horizontal vibration cylinder rod 2 and the vertical vibration cylinder rod 3 are supported so as to be displaceable in a horizontal direction and a vertical direction with respect to a gantry (not shown), and are reciprocated by the hydraulic pressure guided to each.

  The vibration table 1 is supported by two horizontal shafts 4 via four hydrostatic bearings 5 so as to be displaceable in the horizontal direction.

  The vertical vibration cylinder rod 3 is connected to each horizontal shaft 4 via a U-shaped arm 6. The vertical vibration cylinder rod 3 reciprocates in the vertical direction by hydraulic pressure, and this movement is transmitted to the vibration table 1 via the U-shaped arm 6 and each horizontal shaft 4.

  A block 8 is assembled to the vibration table 1, and two vertical shafts 7 are supported by the block 8 via four hydrostatic bearings (not shown) so as to be vertically displaceable.

  A block 8 is connected to the horizontal vibration cylinder rod 2. The horizontal vibration cylinder rod 2 is reciprocated in the horizontal direction by hydraulic pressure, and this movement is transmitted to the vibration table 1 via the block 8 and each vertical shaft 7.

  By the way, it is conceivable to use, for example, a flexible hydraulic hose to supply the pressurized hydraulic fluid to each hydrostatic bearing 5 of each horizontal shaft 4. However, if the hydraulic hose is connected to a movable part such as each horizontal shaft 4, the hydraulic hose also vibrates in the vertical direction together with the horizontal shaft 4, so that it is difficult to maintain the durability of the hydraulic hose.

  Further, there is a problem in that it is difficult to use a flexible hydraulic hose for the hydraulic passages for the respective hydrostatic bearings (not shown) of the vertical shafts 7 as well.

  In response to this, an object of the present invention is to provide a static pressure supply structure for a vibration table that is not easily affected by vibration.

  Hereinafter, the embodiment shown in FIG. 2 will be described with respect to a specific example of the static pressure supply structure of the vibration table.

  FIG. 1 is a cross-sectional view of a hydraulic actuator 20 that drives the horizontal vibration cylinder rod 2. The horizontal vibration cylinder rod 2 is suspended and supported by an oil film formed on the pair of hydrostatic bearings 16 and 17.

  The cylinder body 21 of the hydraulic actuator 20 is formed with ports 26 and 27 communicating with the hydrostatic bearings 16 and 17, respectively. Pressurized hydraulic fluid supplied from a hydraulic source (not shown) is supplied to the ports 26 and 27 in the drawing. Introduced as shown by B.

  A piston 2a of a horizontal vibration cylinder rod 2 is slidably accommodated in a cylinder 31 of the cylinder body 21, and the inside of the cylinder 31 is partitioned into two hydraulic chambers 22 and 23 by the piston 2a.

  Ports 24 and 25 communicating with the hydraulic chambers 22 and 23 are formed in the cylinder body 21, and pressurized hydraulic fluid is introduced into the ports 24 and 25 from servo valves (not shown) as indicated by arrows C and D in the figure. The horizontal vibration cylinder rod 2 is reciprocated.

  The vibration table 1 is connected to one end 19 of the horizontal vibration cylinder rod 2 via a block 8 and vibrates in the horizontal direction together with the horizontal vibration cylinder rod 2.

  As described above, the vertical shaft 7 is slidably supported on the block 8 via the hydrostatic bearing (not shown).

  The hydraulic actuator 20 includes a relay rod 50 extending in the axial direction of the horizontal vibration cylinder rod 2 and a relay cylinder 56 into which the relay rod 50 is slidably fitted. A static pressure supply passage 40 for introducing pressurized hydraulic oil into the static pressure bearing of the vertical shaft 7 is provided therebetween.

  The static pressure supply passage 40 defines a relay oil chamber 60 communicating with a hydraulic pressure source between the outer peripheral surface 51 of the relay rod 50 and the relay cylinder 56, and the relay rod through hole 52 penetrating the relay rod 50 is connected to the relay oil chamber. 60, the cylinder rod through hole 29 penetrating the horizontal vibration cylinder rod 2 in the axial direction is communicated with the relay rod through hole 52 and the hydrostatic bearing of the vertical shaft 7, respectively, and the pressurizing operation supplied from the hydraulic source The oil is introduced into the hydrostatic bearing of the vertical shaft 7 through the relay oil chamber 60, the relay rod through hole 52, and the cylinder rod through hole 29.

  A housing 61 is connected to the cylinder body 21, and a relay cylinder block 55 is accommodated in the housing 61. A relay cylinder 56 and an annular groove 57 that opens to the relay cylinder 56 are formed in the relay cylinder block 55. The relay oil chamber 60 is defined between the annular groove 57 and the outer peripheral surface 51 of the relay rod 50.

  A pair of oil seals 67 and 68 are interposed in the relay cylinder 56 so as to sandwich the annular groove 57, and the relay oil chamber 60 is sealed.

  The cylinder body 21 is formed with an oil passage 41 communicating with a hydraulic source (not shown). An oil passage 62 communicating with the oil passage 41 is formed in the housing 61. The relay cylinder block 55 is formed with an oil passage 63 that communicates the oil passage 62 and the relay oil chamber 60. The oil passage 63 has an annular groove 64 formed in the outer periphery of the cylinder body 21, the annular groove 57 that opens to the annular groove 64 and the relay cylinder 56, and a plurality of through holes 65 that communicate the annular grooves 64, 57. It is comprised by.

  The relay rod 50 has a disc-shaped flange portion 53 connected to the end portion 18 of the horizontal vibration cylinder rod 2, and a cylindrical rod portion 54 extends from the center portion of the flange portion 53 to the horizontal vibration cylinder rod 2. It extends on the central axis. The relay rod through hole 52 includes a plurality of through holes formed in the rod portion 54 and the flange portion 53, respectively.

  The horizontal vibration cylinder rod 2 is formed in a cylindrical shape, and the cylinder rod through hole 29 extends in parallel with the central axis of the horizontal vibration cylinder rod 2.

  A drain chamber 80 is formed between the housing 61, the horizontal vibration cylinder rod 2, the relay rod 50 and the like, and the drain chamber 80 communicates with a tank side (not shown) via a drain passage 81.

  A housing 71 is connected to the housing 61, and a stroke sensor (not shown) is provided through the housing 71. In FIG. 1, reference numeral 72 denotes a detection rod of the stroke sensor, and this detection rod 72 is connected to the tip of the relay rod 50. The stroke displacement of the horizontal vibration cylinder rod 2 is transmitted to the stroke sensor via the relay rod 50 and the detection rod 72.

  The vibration table 1 is configured as described above, and the horizontal vibration cylinder rod 2 of the hydraulic actuator 20 reciprocates in the horizontal direction by the hydraulic pressure of the horizontal vibration cylinder rod 2, and this movement moves the block 8 and the vertical shaft 7. Is transmitted to the vibration table 1.

  As shown by an arrow A in FIG. 1, the pressurized hydraulic oil supplied from the hydraulic pressure source serves as a static pressure supply passage 40, an oil passage 41 of the cylinder body 21, an oil passage 62 of the housing 61, and an oil of the relay cylinder block 55. The fluid is introduced into the hydrostatic bearing of the vertical shaft 7 through the passage 62, the relay oil chamber 60, the relay rod through hole 52, the cylinder rod through hole 29, and the oil passage (not shown) of the block 8.

  Since the relay oil chamber 60 of the static pressure supply passage 40 is defined between the outer peripheral surface 51 of the relay rod 50 and the relay cylinder 56, even if the relay rod 50 reciprocates the relay cylinder 56, the static pressure supply passage 40. The static pressure supply passage 40 is always opened without being interrupted. As a result, the pressurized hydraulic oil is continuously introduced into the hydrostatic bearing of the vertical shaft 7, and the vertical shaft 7 can be smoothly floated and supported.

  By incorporating the static pressure supply passage 40 in the hydraulic actuator 20 in this way, the hydraulic hose connected to the movable part is eliminated, and a static pressure supply structure for the vibration table that is less susceptible to vibration is realized.

  In the present embodiment, the annular groove 57 that opens to the relay cylinder 56 is formed. However, the present invention is not limited to this, and an annular groove that opens to the outer peripheral surface 51 of the relay rod 50 is formed, and the relay oil chamber 60 is connected to the annular groove. It may be defined between the cylinders 56.

  Further, the relay rod 50 may be interposed between the horizontal vibration cylinder rod 2 and the block 8, and the cylinder rod through hole 29 formed in the horizontal vibration cylinder rod 2 may be eliminated.

  In the present embodiment, the following effects can be achieved.

  (A) A horizontal vibration cylinder rod 2 that vibrates the vibration table 1, a hydrostatic bearing that supports the vibration table 1, and a static pressure supply passage 40 that supplies pressurized hydraulic oil to the hydrostatic bearing. In the static pressure supply structure of the vibration table 1 provided, a relay rod 50 extending in the axial direction of the horizontal vibration cylinder rod 2, a relay cylinder 56 in which the relay rod 50 is slidably fitted, and the relay rod 50 A relay oil chamber 60 defined between the outer peripheral surface 51 and the relay cylinder 56 and a relay rod through hole 52 penetrating the relay rod 50 are provided, and the static pressure supply passage 40 is pressurized by a hydraulic source. Since the oil is introduced into the hydrostatic bearing of the vibration table 1 through the relay oil chamber 60 and the relay rod through hole 52, the static pressure supply passage 40 is built in the horizontal vibration cylinder rod 2 and the relay rod 50, and the movable part. Close to Is abolished the hydraulic hose to achieve static pressure supply structure insusceptible vibration table vibrations, enhanced the durability of hydrostatic pressure supply structure vibration table facilitates maintenance.

(A) A cylinder rod through-hole 29 that penetrates the horizontal vibration cylinder rod 2 is provided, and the static pressure supply passage 40 receives pressurized hydraulic fluid supplied from a hydraulic source from the relay oil chamber 60, the relay rod through-hole 52, and the cylinder rod. Since it is configured to be introduced into the hydrostatic bearing of the vibration table 1 through the through hole 29, a hydraulic hose having a static pressure supply passage 40 built in across the horizontal vibration cylinder rod 2 and the relay rod 50 and connected to the movable portion is provided. The static pressure supply structure of the vibration table that is abolished and hardly affected by vibration is realized, the durability of the vibration table's static pressure supply structure is enhanced, and maintenance becomes easy.

  (C) Since the detection rod 72 of the stroke sensor is connected to the relay rod 50 and the displacement of the horizontal vibration cylinder rod 2 is detected by this stroke sensor, the function of incorporating the static pressure supply passage 40 in the detection rod 72 The stroke sensor is provided with a function of transmitting the displacement of the horizontal vibration cylinder rod 2 to simplify the structure.

  (D) Since the horizontal vibration cylinder rod 2 has a hollow structure and the relay rod 50 is formed with the flange portion 53 connected to the end 18 of the horizontal vibration cylinder rod 2, the horizontal vibration is performed by the flange portion 53 of the relay rod 50. The rigidity of the cylinder rod 2 can be increased and the weight of the horizontal vibration cylinder rod 2 can be reduced.

  In the hydraulic actuator 20, a similar static pressure supply passage is provided in the vertical vibration cylinder rod 3 shown in FIG. 2 so that pressurized hydraulic fluid is introduced into the static pressure bearing of the horizontal shaft 4. .

  The present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.

  The static pressure supply structure of the vibration table of the present invention can be used in, for example, a vibration tester, other devices, equipment, and the like.

Sectional drawing of the static pressure supply structure of the vibration table which shows embodiment of this invention. 1 is an exploded perspective view of a vibration testing machine to which the present invention is applied.

Explanation of symbols

2 Horizontal vibration cylinder rod 7 Vertical shaft 20 Hydraulic actuator 21 Cylinder body 29 Cylinder rod through hole 40 Static pressure supply passage 50 Relay rod 51 Relay rod outer peripheral surface 52 Relay rod through hole 55 Relay cylinder block 56 Relay cylinder 60 Relay oil chamber

Claims (4)

A vibration cylinder rod for vibrating the vibration table;
A hydrostatic bearing that supports the vibration table;
In the static pressure supply structure of the vibration table provided with a static pressure supply passage for supplying pressurized hydraulic oil to the static pressure bearing,
A relay rod extending in the axial direction of the vibration cylinder rod;
A relay cylinder for slidably fitting the relay rod;
A relay oil chamber defined between the outer peripheral surface of the relay rod and the relay cylinder;
A relay rod through hole penetrating the relay rod,
The vibration table, wherein the static pressure supply passage is configured to introduce pressurized hydraulic fluid supplied from a hydraulic pressure source to the static pressure bearing of the vibration table through the relay oil chamber and the relay rod through hole. Static pressure supply structure. A cylinder rod through hole penetrating the vibrating cylinder rod;
The static pressure supply passage is configured to introduce pressurized hydraulic oil supplied from a hydraulic pressure source to the hydrostatic bearing of the vibration table through the relay oil chamber, the relay rod through hole, and the cylinder rod through hole. 2. The static pressure supply structure for a vibration table according to claim 1, wherein   The vibration table static pressure supply structure according to claim 2, wherein a detection rod of a stroke sensor is connected to the relay rod, and the displacement of the vibration cylinder rod is detected by the stroke sensor.   The excitation cylinder rod according to any one of claims 1 to 3, wherein the excitation cylinder rod has a hollow structure, and a flange portion connected to an end of the excitation cylinder rod is formed on the relay rod. Shaking table static pressure supply structure.