Load control device

Abstract

To provide a load control device which can suppress an unintentional behavior resulting from a control object when an abrupt load is applied to the control object.SOLUTION: A load control device of the present invention comprises an accumulator connected to a control object, and controlling the supply of a working medium to a pressurization member for controlling a load to the control object, and a control valve for controlling the circulation of the working medium between the pressurization member and the accumulator, the control valve stopping the circulation of the working medium at prescribed acceleration.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a load control device.

Background Art

[0002] Conventionally, a technique for controlling the operation of a loading device using a hydraulic cylinder and an accumulator has been known (see, for example, Patent Documents 1 and 2). In Patent Documents 1 and 2, by controlling the operation timing of the accumulator, the shock generated at the start or stop of the loading device is reduced.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] By connecting a hydraulic cylinder to a lid that can be opened and closed, it is possible to open and close the lid with a small load, and a technique for adjusting the position of the lid with respect to the main body in a natural state where no load other than gravity is applied is known. However, when a sudden load is applied to the lid, such as during an earthquake, there is a risk of unexpected behavior.

[0005]

Means for Solving the Problems

[0006] To solve the above-mentioned problems and achieve the objective, the load control device according to the present invention is characterized by comprising: an accumulator connected to a controlled object and controlling the supply of an operating medium to a pressurizing member that controls the load on the controlled object; and a control valve that controls the flow of the operating medium between the pressurizing member and the accumulator, and which stops the flow of the operating medium at a predetermined acceleration.

[0007] Furthermore, the load control device according to the present invention is characterized in that the control valve comprises: a first shaft portion having a through hole formed to form a flow path connecting the pressurizing member and the accumulator; a second shaft portion connected to one end of the first shaft portion, extending in a direction perpendicular to the axis of the first shaft portion, and having a magnet provided at one end; a first weight provided at the other end of the second shaft portion; a second weight made of a magnetic material that attaches to the magnet from a direction perpendicular to the central axis of the first shaft portion and the second shaft portion; and a connecting member connecting the first weight and the second weight.

[0008] Furthermore, the load control device according to the present invention is characterized in that, in the above invention, the first and second weights are set based on the resonant frequency of the controlled object.

[0009] Furthermore, the load control device according to the present invention is characterized in that, in the above invention, the load control device is installed between the overhead wire that contacts the pantograph and supplies power to the train and the support pole.

[0010] Furthermore, the load control device according to the present invention is characterized in that, in the above invention, the first and second weights are set based on the impact value applied to the support column.

[0011] Furthermore, the load control device according to the present invention is characterized in that the control valve has a shaft portion having a through hole formed to form a flow path connecting the pressurizing member and the accumulator, a motor that rotates the shaft portion, and a control unit that has a sensor and causes the motor to rotate the shaft portion based on the vibration detected by the sensor.

[0012] Furthermore, the load control device according to the present invention is characterized in that the sensor detects acceleration due to shaking at the location where the controlled object is installed.

[0013] Furthermore, the load control device according to the present invention is characterized in that, in the above invention, the sensor detects the acceleration due to the impact applied to the support column that supports the overhead wire that comes into contact with the pantograph and supplies power to the train, via the load control device. [Effects of the Invention]

[0014] According to the present invention, it is possible to suppress unexpected behavior caused by a controlled object when a sudden load is applied to the controlled object. [Brief explanation of the drawing]

[0015] [Figure 1] Figure 1 shows an example of the installation of a load control device according to Embodiment 1 of the present invention. [Figure 2] Figure 2 is a perspective view showing the configuration of a shut-off valve in a load control device according to Embodiment 1 of the present invention, and is a perspective view showing the state when the hydraulic fluid flow path is not shut off. [Figure 3] Figure 3 is a cross-sectional view along line AA shown in Figure 2. [Figure 4] Figure 4 is a perspective view showing the configuration of a shut-off valve in a load control device according to Embodiment 1 of the present invention, and is a perspective view showing the state when the hydraulic fluid flow path is shut off. [Figure 5] Figure 5 is a cross-sectional view along line BB shown in Figure 4. [Figure 6] Figure 6 is a perspective view showing the configuration of a shut-off valve in a load control device according to Embodiment 2 of the present invention, and is a perspective view showing the state when the hydraulic fluid flow path is not shut off. [Figure 7] Figure 7 shows an example of the installation of a load control device according to Embodiment 3 of the present invention. [Figure 8]FIG. 8 is a perspective view showing the configuration of the shut-off valve in the load control device according to Embodiment 3 of the present invention, and is a perspective view showing the state when the flow path of the hydraulic oil is not shut off. [Figure 9] FIG. 9 is a cross-sectional view taken along line D-D shown in FIG. 8. [Figure 10] FIG. 10 is a perspective view showing the configuration of the shut-off valve in the load control device according to Embodiment 3 of the present invention, and is a perspective view showing the state when the flow path of the hydraulic oil is shut off. [Figure 11] FIG. 11 is a cross-sectional view taken along line E-E shown in FIG. 10. [Figure 12] FIG. 12 is a perspective view showing the configuration of the shut-off valve in the load control device according to Embodiment 4 of the present invention, and is a perspective view showing the state when the flow path of the hydraulic oil is not shut off.

Embodiments for Carrying Out the Invention

[0016] Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as "embodiments") will be described with reference to the accompanying drawings. The drawings are schematic, and the relationships between the thickness and width of each part, the ratio of the thickness of each part, etc. may be different from the actual ones, and there may be parts where the dimensional relationships and ratios are different between the drawings.

[0017] (Embodiment 1) FIG. 1 is a diagram showing an installation example of the load control device according to Embodiment 1 of the present invention. The load control device 1 is provided, for example, in a container including a main body part 110 and a lid 120 that can be opened and closed with respect to the main body part 110. The lid 120 is rotatable around a rotation shaft 130. Further, a handle 121 for the user to grip is provided on the lid 120.

[0018] In the container, the user can change the open / closed state relative to the main body 110 by grasping and operating the handle 121. The main body 110 is provided with a hydraulic cylinder 100 connected to the lid 120. When a load is applied by the user to move the lid 120, a reaction force is generated by the hydraulic cylinder 100. This reaction force allows the user to lift the lid 120 with less force than is required to lift the lid 120 itself. Furthermore, by adjusting the pressure of the hydraulic fluid inside the hydraulic cylinder 100, the position of the lid 120 that balances the main body 110 in a natural state where no loads other than gravity are applied can be adjusted. Specifically, the rising angle θ relative to the main body 110 can be adjusted by the pressure of the hydraulic fluid inside the hydraulic cylinder 100, which is a pressurizing member.

[0019] The load control device 1 controls the lid 120 and controls the supply state of hydraulic fluid to the hydraulic cylinder 100 in accordance with the acceleration generated by shaking, etc. The load control device 1 comprises an accumulator 2, a control valve 3, a first connecting pipe 4 connecting the accumulator 2 and the control valve 3, and a second connecting pipe 5 connecting the control valve 3 and the hydraulic cylinder 100.

[0020] The accumulator 2 is equipped with a bellows 21 inside. The bellows 21 is cylindrical with bellows-like sides. The bellows 21 is expandable and contractible by folding the bellows portion. The accumulator 2 has an external and internal section that is independent of the bellows 21, and each space is filled with liquid or gas. In this embodiment 1, an example is described in which the internal space of the bellows 21 is in communication with the first connecting pipe 4. For example, the internal space of the bellows 21 is filled with a medium F1 which is a liquid (hydraulic oil), and the external space is filled with a medium F2 which is a gas. The angle θ described above can be adjusted by the filling pressure of the medium F2.

[0021] Figure 2 is a perspective view showing the configuration of a shut-off valve in a load control device according to Embodiment 1 of the present invention, and is a perspective view showing the state when the hydraulic fluid flow path is not shut off. Figure 3 is a cross-sectional view taken along line AA shown in Figure 2.

[0022] The control valve 3 comprises a housing 31, a first shaft portion 32, a second shaft portion 33, a first weight 34, a second weight 35, and a connecting member 36.

[0023] The housing 31 has an insertion hole 31a through which the first shaft portion 32 is inserted, a first communication hole 31b that connects the first connecting pipe 4 to the insertion hole 31a, and a second communication hole 31c that is located at a different position from the first communication hole 31b and connects the second connecting pipe 5 to the insertion hole 31a.

[0024] A portion of the first shaft portion 32 is inserted into the through hole 31a of the housing 31. At this time, the first shaft portion 32 is in close contact with the through hole 31a without any gaps and is rotatable around the rotation axis N1. The first shaft portion 32 has a through hole 32a with two openings provided at different positions on its side surface. The through hole 32a is formed such that when one opening communicates with the first communication hole 31b, the other opening communicates with the second communication hole 31c (see Figure 3). The second shaft portion 33 is connected to the end of the first shaft portion 32 opposite to the side inserted into the through hole 31a. The rotation axis N1 of the first shaft portion 32 and the longitudinal axis N2 of the second shaft portion 33 are perpendicular to each other.

[0025] A magnet 33a is provided at one end of the second shaft portion 33. A second weight 35 is provided at the other end of the second shaft portion 33. The second shaft portion 33 is rotatable around the rotation axis N1.

[0026] The first weight 34 is formed using a magnetic material. The first weight 34 is attached to the magnet 33a by magnetic force. The first weight 34 is attached to the magnet 33a from a direction perpendicular to the rotation axis N1 of the first shaft portion 32 and the longitudinal axis N2 of the second shaft portion 33, and is movable on a plane parallel to the rotation axis N1 and the longitudinal axis N2, and this movement causes a shift in its relative position to the magnet 33a.

[0027] The second weight 35 is rotatable around the rotation axis N1. Furthermore, the first weight 34 and the second weight 35 are connected by a connecting member 36.

[0028] The weights of the first weight 34 and the second weight 35 are adjusted so that, when the load control device 1 is assembled to the controlled object, the first communication hole 31b and the second communication hole 31c are connected through the through hole 32a in their natural state. In this state, the medium F1 (hydraulic oil) can flow between the accumulator 2 and the hydraulic cylinder 100 through the through hole 32a (see Figure 3). Furthermore, each weight is set based on the resonant frequency of the lid 120 that occurs when shaking occurs. In the load control device 1, for example, the weights of the first weight 34 and the second weight 35, as well as the magnetic force of the magnet 33a, are set so that the weights swing before the resonant frequency reaches the set frequency. Alternatively, the weights of the first weight 34 and the second weight 35, as well as the magnetic force of the magnet 33a, may be set based on the magnitude (gal) of the seismic motion.

[0029] The load control device 1 includes, for example, a rotation axis N1 and a longitudinal axis N2, and is installed such that the plane parallel to the rotation axis N1 and the longitudinal axis N2 is parallel to the horizontal plane. In this case, when a predetermined acceleration occurs in the control valve 3, the first shaft portion 32 rotates. For example, in the control valve 3, the first shaft portion 32 rotates in response to the acceleration generated by a sudden tremor such as an earthquake. Specifically, if the earthquake is a lateral tremor (horizontal tremor), the first weight 34 moves in a direction that is offset from the magnet 33a due to the acceleration generated by this tremor. In this case, the first weight 34 detaches from the magnet 33a and falls. As a result of the fall of the first weight 34, the second shaft portion 33 rotates around the rotation axis N1, and the first shaft portion 32 rotates in conjunction with this rotation. Also, if the earthquake is a vertical tremor (gravity-direction tremor), the second weight 35 moves due to the acceleration generated by this tremor. The movement of the second weight 35 causes the second shaft portion 33 to rotate around the rotation axis N1, and the first shaft portion 32 rotates in conjunction with this rotation. At this time, when the first shaft portion 32 rotates, the balance of the attachment between the first weight 34 and the magnet 33a is disrupted, causing the first weight 34 to detach from the magnet 33a and fall.

[0030] Figure 4 is a perspective view showing the configuration of a shut-off valve in a load control device according to Embodiment 1 of the present invention, and is a perspective view showing the state when the hydraulic fluid flow path is shut off. Figure 5 is a cross-sectional view taken along line BB shown in Figure 4. When the first weight 34 detaches from the magnet 33a and falls, each opening of the through hole 32a of the first shaft portion 32 is positioned differently from the communication position to the first communication hole 31b and the second communication hole 31c (see Figure 5). In this state, the communication between the first communication hole 31b and the second communication hole 31c via the through hole 32a is released, and the flow of hydraulic fluid between the accumulator 2 and the hydraulic cylinder 100 is stopped. When the flow of hydraulic fluid is stopped, the operation of the hydraulic cylinder 100 is locked, and the movement of the lid 120 relative to the main body portion 110 is fixed.

[0031] In this embodiment 1, in the control valve 3, the balance between the first weight 34 and the second weight 35 changes due to acceleration caused by shaking such as an earthquake, causing the first shaft portion 32 to rotate and stopping the flow of hydraulic fluid between the accumulator 2 and the hydraulic cylinder 100, thereby locking the operation of the lid 120. According to this embodiment 1, since the movement of the lid 120, which is the controlled object, is locked in response to sudden shaking such as an earthquake, it is possible to suppress unexpected behavior caused by the controlled object when a sudden load is applied to the controlled object.

[0032] (Embodiment 2) Next, Embodiment 2 of the present invention will be described with reference to Figure 6. Figure 6 is a perspective view showing the configuration of a shut-off valve in a load control device according to Embodiment 2 of the present invention, and is a perspective view showing the state when the hydraulic fluid flow path is not shut off. The same reference numerals are used for the same parts as in the load control device 1 according to Embodiment 1. The load control device according to Embodiment 2 is equipped with a control valve 3A instead of the control valve 3.

[0033] The control valve 3A comprises a housing 31, a first shaft portion 32, a motor 37, and a control unit 38.

[0034] In this second embodiment, the motor 37 is connected to the end of the first shaft portion 32 opposite to the side that is inserted into the insertion hole 31a. The first shaft portion 32 rotates around the rotation axis N1 by the drive of the motor 37.

[0035] The control unit 38 is composed of a processor such as a CPU (Central Processing Unit) or various arithmetic circuits that perform specific functions such as an ASIC (Application Specific Integrated Circuit). The control unit 38 is provided, for example, on the lid 120. The control unit 38 may also be provided on the main body 110 or outside the container.

[0036] The control unit 38 includes a sensor 38a that detects the generation of acceleration due to shaking. The shaking sensor detects, for example, the lateral and vertical shaking of an earthquake. The sensor 38a can use a known type of sensor, such as a ball type. It is preferable that the sensor 38a is installed in a position where it can detect shaking such as earthquakes with high sensitivity, or on the object to be shaken (for example, the lid 120). Shaking information transmitted by the Japan Meteorological Agency or the like may also be used.

[0037] The control valve 3A rotates the first shaft 32 in response to the detection of acceleration due to sudden shaking such as an earthquake. When the sensor 38a detects acceleration exceeding a set value (referred to as the "predetermined acceleration") set according to the shaking, a detection signal is output. When a detection signal is output, the control unit 38 drives the motor 37 to rotate the first shaft 32. When no acceleration is detected, the first communication hole 31b and the second communication hole 31c are in communication through the through hole 32a, and hydraulic fluid flows through them (cross-section along the CC line: see Figure 3). On the other hand, when shaking is detected, the first shaft 32 rotates, and each opening of the through hole 32a of the first shaft 32 is positioned differently from the communication position with the first communication hole 31b and the second communication hole 31c (see, for example, Figure 5). In this state, the communication between the first communication hole 31b and the second communication hole 31c via the through hole 32a is released, and the flow of hydraulic fluid between the accumulator 2 and the hydraulic cylinder 100 is stopped. When the flow of hydraulic fluid stops, the operation of the hydraulic cylinder 100 is locked, and the movement of the lid 120 relative to the main body 110 is fixed.

[0038] In this second embodiment, the control valve 3A detects acceleration due to sudden shaking such as an earthquake, and the control unit 38 rotates the first shaft portion 32 to stop the flow of hydraulic fluid between the accumulator 2 and the hydraulic cylinder 100, thereby locking the operation of the lid 120. According to this second embodiment, since the movement of the lid 120 is locked in response to sudden shaking such as an earthquake, it is possible to suppress unexpected behavior caused by the controlled object when a sudden load is applied to the controlled object.

[0039] (Embodiment 3) Next, Embodiment 3 of the present invention will be described with reference to Figures 7 to 11. Figure 7 is a diagram showing an example of the installation of a load control device according to Embodiment 3 of the present invention. A current collector (pantograph) 201 located on the roof of the train 200 is in contact with the overhead wire, and electrical energy is supplied from this overhead wire. The overhead wire has a trolley wire 210 that is in contact with the pantograph 201 and supplies power to the train 200, and a suspension wire 220 that supports the trolley wire 210 via a hanger. The ends of the overhead wire are connected to a hydraulic cylinder 100. The hydraulic cylinder 100 functions as a balancer, and the end opposite to the side connected to the overhead wire is fixed to a support column 230. The tension of the trolley wire 210 and the suspension wire 220 is adjusted by the hydraulic cylinder 100. Stable power supply to the train 200 is important, and the tension of the overhead wire, which is the target of control, is controlled by the hydraulic cylinder 100.

[0040] Furthermore, the hydraulic cylinder 100's hydraulic fluid supply is controlled by the load control device 1A. In addition, the load control device 1A controls the support column 230 and controls the fluid supply state to the hydraulic cylinder 100 according to the acceleration generated by collisions with the support column 230, etc. The load control device 1A includes an accumulator 2, a control valve 3B, and a second connecting pipe 5 that connects the control valve 3 and the hydraulic cylinder 100. In this embodiment 3, the accumulator 2 and the control valve 3B are directly connected without a connecting pipe.

[0041] Figure 8 is a perspective view showing the configuration of a shut-off valve in a load control device according to Embodiment 3 of the present invention, and is a perspective view showing the state when the hydraulic fluid flow path is not shut off. Figure 9 is a cross-sectional view taken along the DD line shown in Figure 8. The control valve 3B has a housing 31A instead of the housing 31 of the control valve 3 according to Embodiment 1. Other components are the same as those of the control valve 3. The housing 31A supports the first shaft portion 32 and the accumulator 2. Specifically, the housing 31A has a recessed housing portion 301 that accommodates the accumulator 2 and a hole-shaped support portion 302 that rotatably supports the first shaft portion 32. The housing 31A also has an insertion hole 31a through which the first shaft portion 32 is inserted, a first communication hole 31b that connects the housing portion 301 and the support portion 302, and a second communication hole 31c that connects the support portion 302 and the second connecting pipe 5.

[0042] In this third embodiment, the first weight 34 and the second weight 35 are set, for example, based on the impact value applied to the support column 230. Specifically, the weights of the first weight 34 and the second weight 35, as well as the magnetic force of the magnet 33a, are set based on the impact value that would cause the support column 230 to collapse in response to an impact such as a collision.

[0043] The load control device 1A includes, for example, a rotating axis N1 and a longitudinal axis N2, and is installed such that the planes parallel to the rotating axis N1 and the longitudinal axis N2 are parallel to the horizontal plane. When the load control device 1A is assembled to the controlled object, in its natural state, the first communication hole 31b and the second communication hole 31c are in communication through the through hole 32a (see Figure 9). In this state, the medium F1 (hydraulic oil) can flow between the accumulator 2 and the hydraulic cylinder 100 through the through hole 32a.

[0044] On the other hand, the load control device 1A rotates its first shaft 32 in response to sudden shaking such as earthquakes or collisions of the train 200 with the support pillars 230. As described above, when the first weight 34 detaches from the magnet 33a and falls due to acceleration caused by shaking or impact, the second shaft 33 rotates around the rotation axis N1, and the first shaft 32 rotates in conjunction with this rotation.

[0045] Figure 10 is a perspective view showing the configuration of a shut-off valve in a load control device according to Embodiment 3 of the present invention, and is a perspective view showing the state when the hydraulic fluid flow path is shut off. Figure 11 is a cross-sectional view taken along line EE shown in Figure 10. When the first weight 34 detaches from the magnet 33a and falls, each opening of the through hole 32a of the first shaft portion 32 is positioned differently from the communication position to the first communication hole 31b and the second communication hole 31c (see Figure 11). In this state, the communication between the first communication hole 31b and the second communication hole 31c via the through hole 32a is released, and the flow of hydraulic fluid between the accumulator 2 and the hydraulic cylinder 100 is stopped. When the flow of hydraulic fluid is stopped, the operation of the hydraulic cylinder 100 is locked, and the scattering of parts of the hydraulic cylinder 100 or the load control device 1A when the hydraulic cylinder 100 and the load control device 1A fall is suppressed.

[0046] In this third embodiment, in the control valve 3B, the balance between the first weight 34 and the second weight 35 changes due to the acceleration generated by the shaking of the support column 230, etc., causing the first shaft portion 32 to rotate and stopping the flow of hydraulic fluid between the accumulator 2 and the hydraulic cylinder 100, thereby locking the operation of the hydraulic cylinder 100. According to this third embodiment, the load applied to the overhead line is locked in response to sudden shaking such as collisions or earthquakes, so the behavior of the support column 230 and the overhead line, as well as the damage to the control valve 3B, when a sudden load is applied to the controlled object can be suppressed.

[0047] Furthermore, according to this third embodiment, since the housing 31A supports the accumulator 2 and the first shaft portion 32 together, even if the support column 230 tilts due to collision, shaking, etc., the scattering of the accumulator 2 can be suppressed even more reliably.

[0048] (Embodiment 4) Next, Embodiment 4 of the present invention will be described with reference to Figure 12. Figure 12 is a perspective view showing the configuration of a shut-off valve in a load control device according to Embodiment 4 of the present invention, and is a perspective view showing the state when the hydraulic fluid flow path is not shut off. The same reference numerals are used for the same components as in Embodiments 1 to 3. The load control device according to Embodiment 4 is equipped with a control valve 3C instead of the control valve 3B according to Embodiment 3.

[0049] The control valve 3C comprises a housing 31B, a first shaft portion 32, a motor 37, and a control unit 38. The housing 31B supports the first shaft portion 32, the motor 37, and the accumulator 2. Specifically, the housing 31B has a recessed housing portion 301 for housing the accumulator 2, a hole-shaped support portion 302 for rotatably supporting the first shaft portion 32, and a motor support portion 303 for supporting the motor 37. The housing 31B also has a first communication hole 31b connecting the housing portion 301 and the support portion 302, and a second communication hole 31c connecting the support portion 302 and the second connecting pipe 5. The control unit 38 is provided, for example, on a support column 230.

[0050] In this fourth embodiment, the motor 37 is connected to the end of the first shaft portion 32 opposite to the side that is inserted into the through hole 31a. The first shaft portion 32 rotates around the rotation axis N1 by the drive of the motor 37.

[0051] The control valve 3C rotates the first shaft 32 in response to sudden shaking such as a collision between the train 200 and the support column 230 or an earthquake. When the sensor 38a detects a predetermined acceleration corresponding to an impact on the support column 230, it outputs a detection signal. Here, the predetermined acceleration is calculated based on an impact value that would cause the support column 230 to collapse. When the detection signal is output, the control unit 38 drives the motor 37 to rotate the first shaft 32. When the predetermined acceleration is not detected, the first communication hole 31b and the second communication hole 31c communicate through the through hole 32a, and hydraulic fluid flows through them (FF line cross section: see Figure 9). On the other hand, when the predetermined acceleration is detected, the first shaft 32 rotates, and each opening of the through hole 32a of the first shaft 32 is positioned differently from the communication position with the first communication hole 31b and the second communication hole 31c (see, for example, Figure 11). In this state, the communication between the first communication hole 31b and the second communication hole 31c via the through hole 32a is released, and the flow of hydraulic fluid between the accumulator 2 and the hydraulic cylinder 100 is stopped. When the flow of hydraulic fluid is stopped, the operation of the hydraulic cylinder 100 is locked, and the scattering of parts of the hydraulic cylinder 100 or the load control device when the hydraulic cylinder 100 or the load control device falls is suppressed.

[0052] In this fourth embodiment, the control valve 3C detects the generation of acceleration due to the shaking of the support pole 230, etc., and the control unit 38 rotates the first shaft portion 32 to stop the flow of hydraulic fluid between the accumulator 2 and the hydraulic cylinder 100, thereby locking the operation of the hydraulic cylinder 100. According to this fourth embodiment, the movement of the overhead line is locked in response to sudden shaking such as earthquakes, so the behavior of the support pole 230 and the overhead line, as well as the damage to the control valve 3B, can be suppressed.

[0053] While embodiments for carrying out the present invention have been described so far, the present invention should not be limited to the embodiments described above. For example, the load control device 1 according to Embodiment 1 may be applied to Embodiment 3, or the load control device 1A according to Embodiment 3 may be applied to Embodiment 1.

[0054] Furthermore, while embodiments 1 to 4 described an example in which a hydraulic cylinder 100 using hydraulic oil as the working medium is used, a configuration using a pneumatic cylinder with a gas (air, nitrogen, etc.) as the working medium is also possible.

[0055] Thus, the present invention may include various embodiments not described herein, and various design modifications can be made without departing from the technical idea specified by the claims.

[0056] As described above, the load control device according to the present invention is suitable for suppressing unexpected behavior caused by a controlled object when a sudden load is applied to the controlled object. [Explanation of Symbols]

[0057] 1. Load control device 2 Accumulators 3, 3A~3C control valves 4. First connecting pipe 5. Second connecting pipe 31, 31A, 31B enclosure 32 First shaft section 33 Second shaft section 34. First weight 35. Second weight 36 Connecting Members 37 Motor 38 Control Unit 38a Sensor 100 Hydraulic Cylinders 110 Main body 120 Lid 200 trains 201 Pantograph 210 Trolley wire 220 Overhead wire 230 Post N1 rotation axis N2 Long Axis

Claims

1. An accumulator that connects to the controlled object and controls the supply of an operating medium to a pressurizing member that controls the load on the controlled object, A control valve that controls the flow of the operating medium between the pressurizing member and the accumulator, the control valve that stops the flow of the operating medium at a predetermined acceleration caused by external vibrations, Equipped with, The control valve is A first shaft portion having a through hole formed to create a flow path connecting the pressurizing member and the accumulator, A second shaft portion is connected to one end of the first shaft portion, extends in a direction perpendicular to the axis of the first shaft portion, and has a magnet at one end; A first weight is provided at the other end of the second shaft portion, A second weight made of a magnetic material, attached to the magnet from a direction perpendicular to the central axis of the first shaft portion and the longitudinal axis of the second shaft portion, A connecting member for connecting the first weight and the second weight, A load control device characterized by having the following features.

2. The first and second weights are set based on the resonant frequency of the controlled object. The load control device according to feature 1.

3. The load control device is installed between the overhead wire that contacts the pantograph and supplies power to the train, and the support pole. The load control device according to feature 1.

4. The first and second weights are set based on the impact value applied to the support column. The load control device according to feature 3.

5. An accumulator that connects to the controlled object and controls the supply of an operating medium to a pressurizing member that controls the load on the controlled object, A control valve for controlling the flow of the operating medium between the pressurizing member and the accumulator, the control valve for stopping the flow of the operating medium at a predetermined acceleration, Equipped with, The control valve is A first shaft portion having a through hole formed to create a flow path connecting the pressurizing member and the accumulator, A second shaft portion is connected to one end of the first shaft portion, extends in a direction perpendicular to the axis of the first shaft portion, and has a magnet at one end; A first weight is provided at the other end of the second shaft portion, A second weight made of a magnetic material is attached to the magnet from a direction perpendicular to the central axis of the first shaft portion and the longitudinal axis of the second shaft portion, A connecting member for connecting the first weight and the second weight, A load control device characterized by having the following features.

6. The first and second weights are set based on the resonant frequency of the controlled object. The load control device according to feature 5.

7. The load control device is installed between the overhead wire that contacts the pantograph and supplies power to the train, and the support pole. The load control device according to feature 5.

8. The first and second weights are set based on the impact value applied to the support column. The load control device according to feature 7.

9. An accumulator that connects to the controlled object and controls the supply of an operating medium to a pressurizing member that controls the load on the controlled object, A control valve for controlling the flow of the operating medium between the pressurizing member and the accumulator, the control valve for stopping the flow of the operating medium at a predetermined acceleration, A load control device equipped with, The control valve is A shaft portion having a through hole formed to create a flow path connecting the pressurizing member and the accumulator, A motor that rotates the aforementioned shaft, A control unit having a sensor and causing the motor to rotate the shaft based on the vibration detected by the sensor, Equipped with, The aforementioned sensor detects the acceleration caused by the impact applied to the support pole that supports the overhead wire, which is in contact with the pantograph and supplies power to the train, via the load control device. A load control device characterized by the following:

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