JP2006138813A - Excitation testing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an excitation testing device with improved energy efficiency. <P>SOLUTION: This device comprises a two-way discharge pump 1 driven by a motor 104 to discharge a working fluid, an actuator 100 linearly extended and contracted by the working fluid supplied thereto, and first and second passages 21 and 22 constituting a closed circuit connecting the two-way discharge pump to the actuator. The actuator 100 excites a test object by switching the rotating direction of the motor 104. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an improvement of an excitation test apparatus.

Conventionally, the vibration test apparatus is provided with a hydraulic source for driving the test apparatus in addition to the test apparatus main body, and the hydraulic source that is rotationally driven only in one direction is connected via the cylinder and the hydraulic hose of the vibration test apparatus. Connected. Further, a high-speed responsive servo valve is connected to a hydraulic hose between the vibration test device and the drive source, and the cylinder moving speed and load are controlled by switching the servo valve (see Patent Document 1).
JP-A-53-23682

  However, in such a conventional vibration testing device, the drive source always generates a pressure and flow rate corresponding to the maximum load of the testing machine, so when the actually required pressure or flow rate is low. Increases the energy loss. As the loss increases, the amount of heat generation increases, the capacity of the cooling device for releasing heat increases, and the size increases.

  In addition, there is a problem in cost that the installed servo valve capable of high-speed response is expensive.

  The present invention has been made in view of the above problems, and an object thereof is to provide an excitation test apparatus that improves energy efficiency.

  The present invention includes a bidirectional discharge pump that is driven by a motor and discharges a working fluid, an actuator that expands and contracts linearly by the supplied working fluid, and a closed circuit that connects the bidirectional discharge pump and the actuator. 1 and a second passage, and the actuator vibrates the device under test by switching the rotation direction of the motor.

  In the present invention, since the actuator vibrates the device under test by switching the rotation direction of the motor, it is sufficient to consume only the power consumption of the motor necessary to achieve the target vibration condition. It is not necessary to always have an operating condition corresponding to the maximum load, such as a hydraulic power source, and energy efficiency can be improved.

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

  As shown in FIG. 1, the vibration testing apparatus of the present invention includes a cylinder part 100 that vibrates while fixing a test piece and the like, a valve part 101 that adjusts the flow of hydraulic oil supplied to the cylinder part 100, The hydraulic pressure supplied to the cylinder portion 100 via the valve portion 101 is roughly divided into a pump portion 102 that generates according to the vibration test conditions.

  The vibration testing apparatus is formed by unitizing the cylinder unit 100, the valve unit 101, and the pump unit 102 in an integrated manner in the order of the layers. In this test apparatus, the hydraulic fluid sent out by the pump unit 102 is regulated by the valve 101 and supplied to the cylinder unit 100, and the piston rod of the cylinder unit 100 slides to vibrate the test piece. Furthermore, an electric fan 103 for cooling the vibration testing apparatus configured integrally is installed in the pump unit 102, and cooling air is supplied from the pump unit 102 toward the cylinder unit 100 to Promotes heat dissipation.

  As shown in FIG. 2, the pump unit 102 includes a block-shaped pump housing 102 a having a flat surface for connection with other components, the bidirectional discharge pump 1 is installed inside the housing 102 a, and will be described later. The passages 21p and 22p through which the hydraulic oil flows are formed.

  A servo motor 104 that drives and rotates the bidirectional discharge pump 1 is directly connected to and fixed to one surface of the pump housing 102a (the right surface in FIG. 2A). Further, a plurality of cooling fins 105 are fixed to the front and rear surfaces, and the heat radiation efficiency of the pump unit 102 is improved. Further, the above-described electric fan 103 is installed on the upper surface, and the cooling air sent from the electric fan 103 increases the heat radiation efficiency of the pump unit 102 by passing through the fins 105, and the valve unit 101 located in the lower part in FIG. The cooling air is also sent to the cylinder part 100, and these heat can be dissipated.

  The valve unit 101 connected to the lower part of the pump unit 102 includes a valve housing 101a that houses two electromagnetic shut-off valves 28 and 29, as will be described later. The valve housing 101a includes the pump unit 102 and the cylinder unit 100. It is formed in a block shape having a flat portion on the top and bottom so as to be connected. Two electromagnetic shut-off valves 28 and 29 are housed in the interior, and passages 21v and 22v for hydraulic oil supplied to the electromagnetic shut valves 28 and 29 are formed.

  The cylinder portion 100 connected to the valve portion 101 includes a cylinder housing 100a having a flat surface portion connected to the valve portion 101, and the difference in hydraulic oil pressure between two oil chambers partitioned by the piston 13 therein. A rod-shaped piston rod 14 that slides in response is accommodated, a test piece (not shown) is connected to one end of the piston rod 14, and is vibrated by sliding the piston rod 14. Inside the cylinder part 100, passages 21c and 22c for the working oil to flow into the oil chambers 11 and 12 are formed.

  As described above, the vibration testing apparatus of the present invention is characterized in that the cylinder part 100, the valve part 101, and the pump part 102 are formed as a unitary unit, and the hydraulic oil passage configured in each part is formed. However, it is formed so as to communicate by integration. The rotation of the pump is controlled by a directly connected servo motor. Therefore, the hydraulic oil discharged by the pump 1 directly driven by the servo motor 104 passes through a passage formed therein, flows into one oil chamber of the cylinder unit 100, and the hydraulic oil in the other oil chamber flows. By flowing out, a pressure difference between the oil chambers is generated, and the piston rod 14 slides. Then, the operating conditions of the servo motor 104 are set according to the excitation conditions, and the pump 1 directly connected to the servo motor 104 can control the flow rate and pressure of the hydraulic oil finely, and can adjust the moving speed and load when the piston rod slides. It is possible to control and satisfy the required excitation conditions, while suppressing wasteful energy consumption as in the prior art. A controller (not shown) for integrated control of the vibration testing apparatus of the present invention is provided.

  FIG. 2 shows a cross-sectional view of the vibration testing apparatus of the present invention, and FIG. 3 shows the configuration of the hydraulic circuit of the vibration testing apparatus.

  The overall configuration will be described with reference to these drawings. The reservoir tank 3 is defined by first and second passages 21 and 22 that connect the oil discharge chambers 11 and 12 of the bidirectional discharge pump 1 and the double rod type cylinder unit (actuator) 100. Is closed, and the sliding direction of the hydraulic cylinder 2 is switched by switching the rotation direction (discharge direction) of the pump 1 driven by the servo motor 104 capable of forward and reverse rotation. . Furthermore, by controlling the servo motor 104, the flow rate and pressure of hydraulic fluid discharged from the bidirectional discharge pump 1 are controlled, and the sliding speed and load of the hydraulic cylinder can be controlled according to the required excitation conditions. it can.

  In the valve housing 101a constituting the valve portion 101, passages 21b and 22b constituting part of the first and second passages 21 and 22 are formed, and on-off type first and second electromagnetics are formed in the middle of the passage. Shutoff valves (electromagnetic valves) 28 and 29 are interposed, and the electromagnetic shutoff valves 28 and 29 are provided with orifices 28a and 29a. Therefore, when the electromagnetic shut valves 28 and 29 are in the open state, a large flow rate of hydraulic fluid can flow, and when the electromagnetic shut valves 28 and 29 are in the closed state, a small flow rate of hydraulic fluid can flow through the orifices 28a and 29a. The first and second electromagnetic shut-off valves 28 and 29 control the operating flow rate supplied to the oil chambers 11 and 12 of the cylinder unit 100, and together with the flow rate control of the pump 1 by the servo motor 104, The moving speed and load are controlled. Further, by providing the orifices 28a and 29a in the electromagnetic shut-off valves 28 and 29, the load applied to the test piece at the time of emergency stop can be gradually reduced.

  This closed circuit includes a drain passage 25 communicating with the drain side of the pump 1 and the first and second electromagnetic shut-off valves 28 and 29. The reservoir tank 3 is connected to the drain passage 25. The ladder-type reservoir tank 3 is pressurized with hydraulic oil by the pressure of the gas enclosed therein.

  The drain passage 25 is selectively connected to the first and second passages 21 and 22 via the first and second check valves 23 and 24.

  As shown in FIGS. 2 and 3, a pair of gears (drive gear 1 a, driven gear 1 b) constituting the bidirectional discharge pump 1 are interposed in the pump housing 102 a, and the discharge is performed from the bidirectional discharge pump 1. Passages 21p and 22p as part of the first and second passages 21 and 22 as oil passages are formed. The pump housing 102 a is formed with a drain passage hole 31 communicating with the reservoir tank 3, and further formed with a drain passage hole 32 communicating with the check valves 23, 24, and the drain passage 25 constitutes the drain passage 25. Is done. The reservoir tank 3 is screwed onto the pump housing 102 a and faces the drain through hole 31.

  The cylinder portion 100 includes passages 21c and 22c as a part of the first and second passages 21 and 22 through which the hydraulic fluid from the first and second electromagnetic shut-off valves 28 and 29 flows. The cylinder housing 100a includes oil chambers 11 and 12 to which the passages 21c and 22c are connected and hydraulic oil is supplied, and a piston 13 that partitions the oil chamber and acts on the oil pressure. Furthermore, a piston 13 is fixed, and a piston rod 14 that moves in a predetermined axial direction according to a hydraulic pressure difference between the oil chambers, and a cylindrical rod that is slidably mounted in the axial direction and protrudes from one end. The outer cylinder 15 is accommodated.

  The passages 21c and 22c formed in the cylinder part 100, the passages 21b and 22b formed in the valve part 101, and the passages 21p and 22p formed in the pump part 102 are respectively connected in a state where the parts are integrally coupled. Communicate with each other to form the first and second passages 21 and 22.

  Furthermore, an electric fan 103 that is integrally connected to the pump unit 102 is installed. The electric fan 103 controls heat dissipation of the pump unit 102 and contributes to heat dissipation of the cylinder unit 100 and the valve unit 101. Therefore, the electric fan 103 is installed so that the cooling air of the electric fan 103 is blown from the pump unit 102 toward the cylinder unit 100.

  Next, the operation of the embodiment of the present invention configured as described above will be described.

  In the vibration testing apparatus of the present invention, each part 100, 101, 102 is formed in a block shape, and these are assembled and united in a unitary form so that the hydraulic oil passages formed in each part communicate with each other. , First and second passages 21 and 22 are formed. Then, hydraulic oil from the pump 1 whose rotation is controlled by the servo motor 104 circulates in the magnetic shut valves 28 and 29 and the check valves 23 and 24 of the valve unit 101 and is supplied into the oil chambers 11 and 12 of the cylinder unit 100. The

  When the piston rod 14 of the cylinder unit 100 is extended, the servo motor 104 is driven by a command signal from a controller (not shown) corresponding to the vibration test condition, and the pump 1 directly connected to the servo motor 104 is rotated forward. The The hydraulic oil in the front oil chamber 11 is sucked into the pump 1 through the first passage 21, and the hydraulic oil discharged from the pump 1 is sent to the oil chamber 12 on the end side through the second passage 22. . As a result, the pressure in the oil chamber 11 on the front side decreases, while the pressure in the oil chamber 12 on the end side increases, so that the piston rod 12 expands.

  For the sake of explanation, the test piece mounting side of the cylinder part 100 is the front side, and the opposite side is the end side. At this time, the second check valve 24 is closed, the first check 23 is opened, and the pressure in the reservoir tank 3 is guided from the drain passage 25 to the first passage 21 through the first check 23.

  When the cylinder portion 100 is contracted, the servo motor 104 is driven in the reverse direction and the pump 1 is rotated in the reverse direction, and the hydraulic oil in the end side oil chamber 12 is sucked into the pump 1 through the second passage 22. The hydraulic oil discharged from the pump 1 is sent to the oil chamber 11 on the front side through the first passage 21. At this time, the first check 23 is closed, the second check valve 24 is opened, and the pressure in the reservoir tank 3 is guided from the drain passage 25 to the second passage 22 through the second check valve 24. For this reason, the piston rod 14 of the cylinder part 100 contracts.

  By repeatedly extending and contracting the piston rod 14 as described above, the test piece installed at one end of the piston rod 14 can be vibrated.

  In addition, the cooling fan is blown to the pump unit 102 by the electric fan 103 attached to the pump unit 102 to improve the heat dissipation efficiency of the pump unit 102, and the cooling air that has passed through the pump unit 102 is downstream of the valve unit 101. Or flows in contact with the cylinder portion 100.

  As described above, in the vibration test apparatus of the present invention, the control of the discharge flow rate and pressure of the hydraulic oil of the bidirectional discharge pump is performed by controlling the servo motor directly connected to the bidirectional discharge pump. The flow rate of 1 and the discharge direction are arbitrarily controlled. For this reason, it is possible to control the flow rate and pressure of the pump 1 according to the demand of the excitation condition, and to reduce energy loss.

  In addition, when the cylinder part 100, the valve part 101, and the pump part 102 are formed in a block shape and fixed integrally in a unit shape, and the passages through which the working oil is built in each block are integrated. Since the communication is made, the hydraulic hose is not used and the hydraulic oil passage can be shortened. For this reason, flow path resistance is reduced, the power loss of a pump falls, and a small pump motor can be used. Furthermore, since the pump is downsized, the amount of heat generation is reduced, and the cooling electric fan can be downsized.

  In the present invention, since it is not necessary to provide a separate hydraulic source, it is possible to achieve low cost and space saving together with the abolition of the hydraulic hose.

  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 present invention can be used in a vibration test apparatus that vibrates a test piece under predetermined conditions.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a general view of a vibration test apparatus showing an embodiment of the present invention. Sectional drawing of a vibration test apparatus similarly. The circuit diagram of a vibration test apparatus similarly.

Explanation of symbols

1 Pump 2 Hydraulic cylinder (actuator)
3 reservoir tank 11 oil chamber 12 oil chamber 13 piston 14 piston rod 15 outer cylinder 21 first passage 21c passage (cylinder portion)
21p passage (pump part)
21v passage (valve part)
22 Second passage 22c Passage (cylinder part)
22p passage (pump part)
22v passage (valve part)
23 First check valve 24 Second check valve 25 Drain passage 100 Cylinder part 100a Cylinder body 101 Valve part 101a Valve body 102 Pump part 102a Pump body 103 Electric fan 104 Servo motor 105 Fin

Claims (6)

A bidirectional discharge pump that is driven by a motor and discharges the working fluid;
An actuator that expands and contracts linearly by the supplied working fluid;
Comprising first and second passages constituting a closed circuit connecting the bidirectional discharge pump and the actuator,
The vibration testing apparatus, wherein the actuator vibrates the device under test by switching the rotation direction of the motor.   The vibration test apparatus according to claim 1, wherein an electromagnetic valve for adjusting a flow rate of the working fluid is provided in the first and second passages.   The pump housing of the bidirectional discharge pump, the cylinder housing of the actuator, and the valve housing of the electromagnetic valve are fixed in a stacked manner so that the working fluid passages formed in the housings communicate with each other. The vibration test apparatus according to claim 1, wherein there are two passages.   The vibration test apparatus according to claim 1, wherein a cooling fan is provided in the pump housing.   The vibration test apparatus according to claim 4, wherein the cooling fan allows cooling air to flow in the order of the pump housing, the valve housing, and the cylinder housing.   The vibration test apparatus according to claim 5, wherein a fin that receives the cooling air is provided in the pump housing.

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