Wing Container

Abstract

To prevent hydraulic oil from adhering to a load when a wing of a wing container is driven to rotate.SOLUTION: A wing container comprises a pair of hydraulic cylinders 120 with stretchable piston rods connected to a wing 16 at a front part and a rear part of a container housing, wherein a contraction chamber 127 of the pair of hydraulic cylinders 120 is sealed by a sealing member 121c, and the wing 16 is rotated by being connected in parallel to a hydraulic circuit and performing a synchronization operation. When a hydraulic oil 24 leaks into the contraction chamber 127 of any hydraulic cylinder 120, by shortening the maximum extension length of the piston rod 125, the wing 16 is twisted and opened so that a fully opened angle differs between a front side and a rear side. Therefore, the sealing member 121c prevents the hydraulic oil 24 from leaking to the outside, and internal leak to the contraction chamber 127 which causes external leak can be visually confirmed by the twisting of the opened wing 16.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The disclosure of the present application relates to a wing container, a hydraulic circuit device for a wing container, and the like. [Background technology]

[0002] A wing container is a cargo box with wings on the container casing that open and close by rotating up and down, and is used as a transport container for marine transport, rail transport, etc., and as a truck container. As an example, Patent Document 1 discloses a wing container as a transport container used for marine transport.

[0003] Figure 5 shows an external view of a wing container 10, which is a transport container, seen from the rear side. The container casing 11 has a floor 12, a front frame 13, a rear frame 14, and a center beam 15. The front frame 13 is disposed at one end (front end) of the floor 12 in the longitudinal direction, and the rear frame 14 is disposed at the other end (rear end). The front frame 13 also functions as a door frame that holds a double-door (not shown) so that it can be opened and closed. The center beam 15 spans between the front frame 13 and the rear frame 14.

[0004] Wings 16 (right wing and left wing) are arranged on the left and right of the center beam 15. Each wing 16 is supported by a rotation shaft 16a and a rotation support portion 15a provided on the center beam 15, and is supported so as to be rotatable up and down by hydraulic cylinders 20 attached to the front frame 13 and rear frame 14, respectively. The hydraulic cylinder 20 has a bottom-side mounting portion 21, which serves as the fixed end, rotatably attached to the front frame 13 or the rear frame 14, and a rod-side mounting portion 22, which serves as the movable end, rotatably attached to the front or rear of the wing 16. Two hydraulic cylinders 20 attached to the front and rear sides of each wing 16 form a pair and are connected in parallel to a flow divider valve that supplies hydraulic oil. The flow divider valve is connected to a hydraulic tank via an electric hydraulic pump unit 30 arranged on the floor 12. Therefore, the front and rear hydraulic cylinders 20 of each wing 16 are operated in synchronization to rotate the wing 16 so that the opening degrees of the front end and the rear end of the wing 16 are equal.

[0005] The hydraulic cylinder 20 has a single-acting piston structure. As shown in Figure 6, the extension chamber port 23a of the cylinder tube 23 is connected to a pipe 31, from which hydraulic oil 24 is supplied to the extension chamber 25 (bottom chamber), driving a piston 26 consisting of a piston rod 26a and a piston head 26b. When the piston 26 extends, air in a compression chamber 28 separated by a piston packing 26c and a cylinder head packing 27a provided on the cylinder head 27 is discharged to the atmosphere through an air breather 23c attached to the compression chamber port 23b. On the other hand, when the piston 26 retracts, air flows into the compression chamber 28 through the air breather 23c. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 5590478 Summary of the Invention [Problem to be solved by the invention]

[0007] In the hydraulic cylinder 20 provided in such a conventional hydraulic circuit device for a wing container, damage to the piston packing 26c causes the hydraulic oil 24 to gradually leak from the extension chamber 25 to the compression chamber 28, as shown in Figure 6. Damage to the piston packing 26c is mostly caused by foreign matter (contamination) getting caught in it. If internal leakage of the hydraulic oil 24 continues in this way and hydraulic oil accumulates in the compression chamber 28, when the wings 16 are opened, the hydraulic oil 24 pressurized by the piston head 26b that propels the compression chamber 28 may blow out from the air breather 23c and fall on the cargo housed in the wing container 10, causing damage.

[0008] The present invention was made against the background of the above-mentioned conventional technology, and its object is to prevent hydraulic oil from adhering to the cargo when the wing is driven to rotate. [Means for solving the problem]

[0009] One aspect of the present invention is a wing container comprising a container housing having wings that rotate up and down to open and close, and a pair of hydraulic cylinders having extendable piston rods connected to the wings at the front and rear of the container housing, wherein the pair of hydraulic cylinders have compression chambers that are sealed from the outside of the cylinder tubes by sealing portions that the cylinder tubes have, and the hydraulic cylinders are connected in parallel to a hydraulic circuit and operate in sync to rotate the wings; when hydraulic oil leaks into the compression chamber of any of the hydraulic cylinders, the maximum extension length of the piston rod becomes shorter, causing the wings to twist open so that the full opening angle is different on the front side and the rear side.

[0010] One aspect of the present invention can be configured as a hydraulic circuit device for a wing container including the pair of hydraulic cylinders.

[0011] One aspect of the present invention can be configured as a transport container that is the wing container.

[0012] One aspect of the present invention can be configured as a wing truck equipped with the wing container. [Effects of the Invention]

[0013] According to one aspect of the present invention, it is possible to prevent hydraulic oil from the hydraulic cylinder from adhering to the cargo when the wing is driven to rotate. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a plan view of a wing container according to one embodiment. [Figure 2] FIG. 1 is a cross-sectional view showing an outline of the internal structure of a hydraulic cylinder according to one embodiment. [Figure 3] 1 is a circuit diagram showing an entire hydraulic circuit device for a wing container according to an embodiment. [Figure 4] 10A and 10B are explanatory diagrams illustrating the operation of wings of a wing container according to one embodiment. [Figure 5] FIG. 1 is an explanatory diagram showing the rear of a conventional wing container. [Figure 6] FIG. 10 is an explanatory diagram of the operation of a hydraulic cylinder according to a conventional example. DETAILED DESCRIPTION OF THE INVENTION

[0015] An example of an embodiment according to one aspect of the present invention will be described below. The embodiment described below does not unduly limit the content of the present invention described in the claims, and not all of the configurations described in the embodiment are necessarily essential as a solution to the present invention.

[0016] In the following description, an example will be shown in which a wing container and a hydraulic circuit device for a wing container according to one aspect of the present invention are applied to a transport container, in particular a container for marine transport. However, the present invention is not limited to this, and in another aspect, it can be configured as a container for rail transport. Furthermore, it can also be configured as a cargo box for a wing truck.

[0017] In the following description, the double doors provided at one longitudinal end of the wing container 10 are defined as the front, with the left-right direction (width direction) defined as the X direction, the front-rear direction (longitudinal direction) defined as the Y direction, and the up-down direction (height direction) defined as the Z direction. The terms "first" and "second" used in this specification and claims are used to distinguish different components and are not used to indicate a particular order or superiority or inferiority. The drawings schematically show the main parts of the device configuration to facilitate understanding of the embodiments. Furthermore, the same components in each figure are designated by the same reference numerals, and duplicate explanations in the specification will be omitted.

[0018] The wing container 10 described as one embodiment is configured as a 40-foot container. However, the wing container 10 can be configured as a 20-foot container or any other size. It can also be configured as a wing container 10 equipped with a reefer device.

[0019] Wing Container 10 Description

[0020] The wing container 10 has a container housing 11 and wings 16 (FIGS. 1 and 5). The container housing 11 is composed of a floor 12, a front frame 13, a rear frame 14, a center beam 15, and a pair of wings 16 (a right wing and a left wing). When the pair of wings 16 are closed, a box-shaped cargo space is formed. The front frame 13 includes a double door serving as a front wall. The rear frame 14 includes a rear wall. The floor 12 of the wing container 10 is equipped with a hydraulic circuit system 100 for a wing container (hereinafter referred to as the "hydraulic circuit system 100") (see FIG. 3). In order to maximize the cargo space volume of the wing container 10 and improve transport efficiency, there are limitations on the installation space for machinery and equipment including piping such as the hydraulic circuit system 100. Therefore, the hydraulic circuit system 100 is required to meet the demand for space saving as much as possible. 1, the hydraulic circuit system 100 is provided with a pair of hydraulic cylinders 120 arranged at the front and rear ends of each wing 16. The configuration of the hydraulic cylinders 120 is different from the configuration of the hydraulic cylinder 20 described above. Therefore, the hydraulic cylinder 120 will be described first.

[0021] Hydraulic Cylinder 120 Description

[0022] The hydraulic cylinder 120 includes a cylinder tube 121 and a piston 122. The cylinder tube 121 is formed of a cylindrical metal material, and a bottom 123 is fixed to the rear end of the cylinder tube 121 by welding. The bottom 123 has a bottom-side mounting portion 123a. The bottom-side mounting portion 123a is rotatably attached to the front frame 13 and the rear frame 14, as shown in FIG. 1, by having a mounting shaft rotatably inserted into circular mounting holes 123b formed in opposing plate pieces. A cylinder head 124 is fixed inside the front end of the cylinder tube 121 and seals the front end of the cylinder tube 121. A cylinder head packing 124a is provided on the inner peripheral surface of the cylinder head 124, which is in sliding contact with the outer peripheral surface of a piston rod 125 (described below).

[0023] The piston 122 includes a piston rod 125 and a piston head 126. The piston rod 125 has a rod-side mounting portion 125a at its tip end protruding from the cylinder head 124. The rod-side mounting portion 125a is attached to the wing 16, as shown in FIG. 1, by inserting a mounting shaft rotatably into circular mounting holes 125b formed in opposing plates. A check valve 125c is built into the rear end of the piston rod 125. The check valve 125c has an "internal drain function" that opens at a predetermined valve opening pressure and recovers hydraulic oil 24 that has leaked into the compression chamber 127 from the compression chamber 127 to the extension chamber 128. The check valve 125c has a valve disc (not shown) and a spring that constantly presses the valve disc against a valve seat from the extension chamber 128 side to the compression chamber 127 side to close the valve. The compression chamber 127 side of the check valve 125c is in communication with the compression chamber 127 via a compression chamber side passage 125d formed in the piston rod 125.

[0024] The rear end connecting portion 125e of the piston rod 125 is threadedly connected to the connecting recess 126a of the piston head 126. In this connected state, the extension chamber 128 side of the check valve 125c communicates with the extension chamber 128 via an extension chamber-side passage 126b formed in the piston head 126. In other words, the extension chamber-side passage 126b communicates between the bottom of the connecting recess 126a and the extension chamber 128. A piston packing 126c that comes into sliding contact with the inner peripheral surface of the cylinder tube 121 is provided on the outer peripheral surface of the piston head 126.

[0025] An extension chamber 128 is formed on the side of the bottom 123 closer to the piston packing 126c, and an extension chamber port 121a that communicates with the extension chamber 128 is formed in the cylinder tube 121. A piping 131 is connected to the extension chamber port 121a. A compression chamber 127 is formed between the piston packing 126c and the cylinder head packing 124a, and a compression chamber port 121b that communicates with the compression chamber 127 is formed in the cylinder tube 121 at a position adjacent to the rear end of the cylinder head 124.

[0026] A sealing member 121c, which serves as a "sealing portion," is attached to the compression chamber port 121b, thereby sealing the compression chamber 127 airtight and liquidtight from the outside of the cylinder tube 121. This prevents outside air, rainwater, and moisture and foreign matter mixed therein from entering the compression chamber 127 through the compression chamber port 121b. In comparison, the prior art hydraulic cylinder 20 is designed to allow outside air to enter the compression chamber 28 through the air breather 23c of the compression chamber port 23b. This can lead to the risk of moisture entering the compression chamber 28 during marine transport, adhering to the inner circumferential surface of the cylinder tube 23 and causing rust. Furthermore, minute foreign matter, such as dust, mixed with the outside air can become lodged in the piston packing 26c, potentially causing internal leakage. In contrast, the hydraulic cylinder 120 eliminates these problems because the sealing member 121c seals the compression chamber port 23b airtight and liquidtight. That is, there is no need for rust prevention measures or contamination countermeasures that are required in the case of the air breather 23c. Furthermore, while the air breather 23c of the conventional hydraulic cylinder 20 requires periodic filter replacement, this is not necessary in the hydraulic cylinder 120.

[0027] Furthermore, sealing member 121c can be removed during maintenance of hydraulic cylinder 120. Therefore, it is possible to insert a microscope through compression chamber port 121b to check the internal condition of compression chamber 127, clean the interior of compression chamber 127, and recover hydraulic oil 24 that has leaked into compression chamber 127, without having to disassemble hydraulic cylinder 120 as a whole.

[0028] The basic position of the hydraulic cylinder 120 is the minimum compression state in which the piston rod 125 is fully retracted, and the wings 16 are closed in this basic position. When the cylinder is in the minimum compression state and unloaded, the gauge pressure in the extension chamber 128 is approximately 0 MPa, and the compression chamber 127 is under negative pressure (for example, up to -0.1 MPa). The compression chamber 127 is sealed by the piston packing 126c and the cylinder head packing 124a, and the compression chamber port 121b is closed by the sealing member 121c, forming an enclosed space under negative pressure. This is important. For example, if the compression chamber port 121b is sealed by the sealing member 121c in the minimum compression state, air will remain in the compression chamber 127 at atmospheric pressure. When the piston rod 125 is extended, the air in the compression chamber 127 will be compressed, increasing its pressure, and this will cause a problem in that the wings 16 will not rise and open. For this reason, as described above, compression chamber port 121b is sealed by sealing member 121c when piston rod 125 is in the fully extended state. Also, the posture that requires the most thrust when opening wing 16 is when starting to raise wing 16, but because compression chamber 127 is under negative pressure in the fully compressed state, the thrust at the start can be assisted by the thrust equivalent to the negative pressure.

[0029] Description of hydraulic circuit device 100

[0030] The hydraulic circuit system 100 has a circuit configuration shown in Fig. 3 and specifically includes a first hydraulic cylinder 120F and a second hydraulic cylinder 120R. The former is provided, for example, on the front end side of the wing 16, and the latter is provided on the rear end side of the same wing 16.

[0031] The extension chamber ports 121a of the first hydraulic cylinder 120F and the second hydraulic cylinder 120R are each connected to a fuse valve 132 via a pipe 131. The first fuse valve 132F and the second fuse valve 132R maintain pressure and prevent the wings 16 from descending naturally when the pipe 131 is damaged and causes an oil leak or when oil leaks from a joint of the pipe 131. The wing container 10 is often used in harsh environments where it is subjected to impacts or collisions with other containers when being loaded onto or unloaded from a ship or vehicle, and the pipe 131 may be damaged during such use. Therefore, even if the pipe 131 is damaged in a manner that causes an oil leak, the first fuse valve 132F and the second fuse valve 132R operate to suppress the natural descent of the wings 16 as much as possible, thereby improving the safety of loading and unloading operations.

[0032] The first fuse valve 132F and the second fuse valve 132R are connected in parallel to the flow dividing valve 134 via piping 133. This allows the first hydraulic cylinder 120F and the second hydraulic cylinder 120R to operate in sync when expanding and contracting. The flow dividing valve 134 is connected to a slow return check valve 136 via piping 135. The function of this valve will be described later. The section from a pump 138b (described later) to the flow dividing valve 134 constitutes a "hydraulic circuit" in which the first hydraulic cylinder 120F and the second hydraulic cylinder 120R are connected in parallel.

[0033] The slow return check valve 136 is connected to an electric hydraulic pump unit 138 and an emergency hydraulic pump unit 139 via a pipe 137. A manually operated stop valve 140 is connected to the secondary side of the emergency hydraulic pump unit 139, and this is always closed during normal operation of the hydraulic circuit system 100. Therefore, during normal operation, the oil line is a line that supplies hydraulic oil 24 from a hydraulic tank 143 (described below) to the hydraulic cylinder 120 via the electric hydraulic pump unit 138. The pressure in the pipe 137 is measured by a pressure gauge 141.

[0034] A pressure switch 142 is connected to the pipe 137. The pressure switch 142 is a switch for stopping the driving of the electric motor 138a by detecting the pressure of the relief valve 138e.

[0035] The electric hydraulic pump unit 138 drives a pump 138b with an electric motor 138a, and sends the hydraulic oil 24 from a hydraulic tank 143, which has been sucked in through a filter 138c, to a pipe 137 through a check valve 138d. The pressure of the hydraulic oil 24 sent from the pump 138b is monitored by a relief valve 138e, and if the pressure exceeds the set pressure of the hydraulic circuit system 100, the relief valve 138e opens to return the hydraulic oil 24 to the hydraulic tank 143, thereby relieving pressure that would apply an excessive load to the hydraulic circuit system 100. The check valve 138d functions as a check valve that prevents the hydraulic oil 24 from flowing toward the pump 138b during an opening operation (when the hydraulic cylinder 120 is extended) and a closing operation (when the hydraulic cylinder 120 is retracted) of the wing 16. The solenoid valve 138f is activated by operating an open / close switch (not shown) of the wing 16, and maintains a closed state when the wing 16 is opening, so that the hydraulic oil 24 is sent to the pipe 137. On the other hand, the solenoid valve 138f opens when the wing 16 is closing, so that the hydraulic oil 24 in the hydraulic cylinder 120 is bypassed to the hydraulic tank 143.

[0036] The emergency hydraulic pump unit 139 is used in the event of an emergency in which the piston packing 126c is damaged, causing an internal leak in which the hydraulic oil 24 leaks from the extension chamber 128 to the compression chamber 127, and the electric hydraulic pump unit 138 is unable to fully open the wing 16. The operation in an emergency will be described in more detail below.

[0037] The emergency hydraulic pump unit 139 includes a hand pump 139c having a high pump 139a and a low pump 139b. To drive the hand pump 139c, a stop valve 140 in the pipe 137 is opened, and, for example, a pedal is continuously depressed. As a result, the hydraulic oil 24 is drawn from the hydraulic tank 143 through the filter 139d, sent to the pipe 137 through the check valve 139g or the check valve 139h, and then supplied to the hydraulic cylinder 120. Two relief valves 139e and 139f return the hydraulic oil 24 to the hydraulic tank 143, relieving pressure that would otherwise apply excessive load to the hydraulic circuit device 100.

[0038] Explanation of Wing 16 opening and closing operation

[0039] The opening operation (extension of the hydraulic cylinder 120) and closing operation (retraction of the hydraulic cylinder 120) of the wing 16 are performed by operating an open / close switch (not shown). To open the wing 16 from a closed state, the wing lift button on the open / close switch is pressed to load the pump 138b. When the wing lift button is pressed, the solenoid valve 138f remains closed, and the pump 138b supplies hydraulic oil 24 from the hydraulic tank 143 to the extension chamber 128, extending the piston rod 125. This allows the wing 16 to be raised to the fully open angle (the rotation angle of the roof of the wing 16 when it rotates around the rotation axis 16a relative to the roof of the wing 16 in the closed state and is fully opened). When the wing 16 begins to rise, a compressive force is generated by a moment, and the volume of the compression chamber 127, which is initially under negative pressure, decreases, changing to a gauge pressure of 0 MPa when the wing 16 is fully extended. After the wings 16 are fully extended, the pump 138b is unloaded and the pressure is maintained by the check valve 138d, i.e., the open position of the wings 16 is fixed.

[0040] When the wing lowering button on the open / close switch is pressed, the solenoid valve 138f opens, bypassing the hydraulic circuit on the extension chamber 128 side to the hydraulic tank 143. The wing 16 falls under its own weight at a predetermined speed under meter-out control via the throttle of the slow return check valve 136. At this time, the hydraulic oil 24 in the extension chamber 128 is pushed out by the piston rod 125, which bears the weight of the wing 16, into the extension chamber port 121a, and returns to the hydraulic tank 143 through the throttle of the slow return check valve 136. The pressure in the compression chamber 127 then becomes negative as its volume increases from a gauge pressure of 0 MPa (atmospheric pressure). In this way, the wing 16 descends to the fully closed position and closes.

[0041] effect

[0042] The effects of the wing container 10 and the hydraulic circuit system 100 described above will be explained.

[0043] (1) Preventing hydraulic oil from scattering A sealing member 121c serving as a "sealing portion" is attached to the compression chamber port 121b of the hydraulic cylinder 120, and the compression chamber 127 is sealed from the outside of the cylinder tube 121. Therefore, even if the piston 122 extends with hydraulic oil 24 accumulated in the compression chamber 127 due to an internal leak, the hydraulic oil 24 will not spray out from the compression chamber port 121b, preventing the occurrence of a problem in which the hydraulic oil 24 splashes on and soils the cargo stored in the wing container 10, as occurs in the prior art.

[0044] [2] Visualization of internal leaks in the hydraulic cylinder 120 If an internal leak occurs, in which hydraulic oil 24 leaks from the extension chamber 128 to the compression chamber 127, hydraulic oil 24 accumulates in the compression chamber 127. Because the compression chamber 127 is sealed with a sealing member 121c, unlike the air breather 23c of the prior art, the accumulated hydraulic oil 24 cannot be discharged. Therefore, even if pressurized oil is supplied to the extension chamber 128, the hydraulic oil 24 in the compression chamber 127, which is an incompressible fluid, prevents the piston head 126 from propelling to the cylinder head 124. Therefore, if an internal leak occurs, the piston rod 125 cannot be extended to its normal, fully extended state. As a result, as shown in Figure 4, for a hydraulic cylinder 120 experiencing an internal leak, the wings 16 (roofs of the wings 16) cannot be rotated to their normal, fully opened positions. As a result, the wings 16 are twisted open so that the front and rear sides of the wings 16 are at different fully opened angles.

[0045] 4 shows an example of the wing 16 being twisted open. The first hydraulic cylinder 120F on the front side, shown by the two-dot chain line, has an internal leak, resulting in a short extension length LF, and the front end of the wing 16, shown by the two-dot chain line, is unable to open to its full open angle. In contrast, the second hydraulic cylinder 120R on the rear side, shown by the solid line, operates normally and extends to its full extension length LR, and the rear end of the wing 16, shown by the solid line, is shown to be open to its full open angle. Because the front end of the wing 16 is thus lower in the open position than the rear end, the wing 16 (roof of the wing 16) is twisted open overall in the longitudinal direction.

[0046] In this way, in the wing container 10 and the hydraulic circuit device 100, if an internal leak occurs in one of the hydraulic cylinders 120, or if an internal leak occurs in both of the hydraulic cylinders 120 and there is a difference in the amount of internal leakage, the wing 16 (roof of the wing 16) will twist open, which can be visually confirmed by appearance. Therefore, the occurrence of an internal leak can be easily detected without disassembling the hydraulic cylinder 120. Note that if it is confirmed that the roof of the wing 16 is twisted open, the hydraulic cylinder 120 is abnormal, and the hydraulic cylinder 120 needs to be overhauled or replaced. The twisting phenomenon of the wing 16 can be used as an indicator of this.

[0047] [3] Compensation for opening of wing 16 in an emergency If an internal leak occurs in the hydraulic cylinder 120, as shown in Figure 4, the wing 16 (roof of the wing 16) will not open to its normal full open angle, and if the amount of internal leakage is large, the wing 16 may even drop naturally. In this case, the cargo must be immediately removed from the wing container 10 and repaired, but the cargo may not be able to be removed unless the wing 16 is kept open to its normal full open angle. To respond to such an emergency, the wing container 10 and the hydraulic circuit device 100 are equipped with an emergency hydraulic pump unit 139 and an internal drain structure (check valve 125c, retraction chamber side passage 125d, extension chamber side passage 126b) as "emergency wing drive means."

[0048] In an emergency, to open the wing 16 to its normal full-open angle, it is necessary to remove the hydraulic oil 24 that has leaked into the compression chamber 127. To achieve this, the emergency hydraulic pump unit 139 and the internal drain structure can return the hydraulic oil 24 from the compression chamber 127 to the extension chamber 128 by opening the check valve 125c. Specifically, after opening the stop valve 140 of the piping 137, the hand pump 139c of the emergency hydraulic pump unit 139 is operated to send the hydraulic oil 24 and pressurize the extension chamber 128. To open the check valve 125c, it is necessary to perform a "boost pressurization" that increases the pressure in the compression chamber 127 relative to the sum of the set pressure of the hydraulic circuit device 100, which is set in consideration of the compressive force due to the moment of the wing 16 acting on the piston rod 125, and the cracking pressure of the check valve 125c itself (the opening pressure of the check valve 125c). When the hand pump 139c is operated to pressurize the extension chamber 128, the compression chamber 127 is boosted, opening the check valve 125c and bypassing the compression chamber 127 to the extension chamber 128. As the hydraulic oil 24 is gradually withdrawn, the piston head 126 is also gradually advanced, allowing the piston rod 125 to extend to its fully extended position, similar to the normal state. In this way, even if an internal leak occurs in one of the hydraulic cylinders 120, the wings 16 can be rotated and opened to their full open position, similar to the normal state.

[0049] [4] Simplification of the hydraulic circuit system 100 by the fuse valve 132 The wing container 10 and the hydraulic circuit system 100 are provided with a fuse valve 132. If such a fuse valve 132 is not used, it is possible to use a pilot check valve to control the position of the wing 16. However, a pilot check valve not only makes the device larger than the fuse valve 132, but also requires more piping and fittings, which require installation space. However, by providing the fuse valve 132, it is possible to eliminate the use of these parts and simplify the hydraulic circuit system 100, making it possible to provide a configuration suitable for the wing container 10, which has limited installation space.

[0050] [5] Simplification of the hydraulic circuit device 100 by closing the compression chamber port 121b The compression chamber port 121b of the hydraulic cylinder 120 is sealed by a sealing member 121c, leaving only the extension chamber port 121a as the outlet for the hydraulic oil 24 from the hydraulic cylinder 120. For example, if the outlet for the hydraulic oil 24 were the compression chamber port 121b, a pilot check valve for maintaining pressure (maintaining the open position of the wings 16) would need to be incorporated into the hydraulic circuit, which would be difficult to incorporate into the wing container 10, which has limited installation space. However, in this embodiment, the only outlet for the hydraulic oil 24 is the extension chamber port 121a, and the pressure can be maintained by the check valve 138d. This allows the hydraulic circuit device 100 to be simplified, resulting in a configuration suitable for the wing container 10, which has limited installation space. Furthermore, the hydraulic cylinder 120 itself can be made small because the cylinder diameter (bore diameter) is a parameter that determines thrust, making it a configuration suitable for the wing container 10, which has limited installation space.

[0051] Modifications of the embodiment

[0052] Although an embodiment according to one aspect of the present invention has been described in detail above, it will be readily apparent to those skilled in the art that many modifications are possible without substantially departing from the configuration and effects of the present invention. Therefore, all such modifications are intended to be included within the scope of the present invention.

[0053] For example, a term described at least once in the specification or drawings together with a different term having a broader or equivalent meaning can be replaced with that different term anywhere in the specification or drawings. Furthermore, the configurations and operations of the wing container 10 and the hydraulic circuit device 100 are not limited to those described in the above embodiment, and various modifications are possible.

[0054] In the above embodiment, an example has been shown in which the wing container 10 has wings 16 on both the left and right sides of the center beam 15, but in a modified example, the wing 16 may be provided on only one side. Also, in the above embodiment, an example has been shown in which the wing 16 has side gates that form part of the side walls of the wing container 10, but in a modified example, the side gates may be provided on the floor 12 instead of the wings 16.

[0055] In the above embodiment, a removable sealing member 121c is provided to seal the compression chamber port 121b, but in a modified example, the sealing member can be configured as a non-removable member. However, in this modified example, the effect of the removable sealing member 121c cannot be achieved.

[0056] In the above embodiment, a marine transport container has been exemplified as the wing container 10, but the wing container 10 can also be configured as a wing container for rail transport, or as a cargo box for a wing truck. [Explanation of symbols]

[0057] 10 Wing Container 11 Container housing 12 Floor 13 Front frame 14 Rear frame 15 Center beam 15a Rotation support part 16 Wing 16a Rotation axis 20 Hydraulic cylinder 21 Bottom mounting part 22 Rod side mounting part 23 Cylinder tube 23a Extension chamber port 23b Shrinkage chamber port 23c Air Breather 24 Hydraulic oil 25 Stretching Room 26 Piston 26a Piston rod 26b Piston head 26c Piston packing 27 Cylinder head 27a Cylinder head packing 28 Shrinking Chamber 30 Electric hydraulic pump unit 31 Piping 100 Hydraulic circuit for wing container 120 Hydraulic Cylinder 120F First hydraulic cylinder 120R Second hydraulic cylinder 121 Cylinder tube 121a Extension chamber port 121b Shrinkage chamber port 121c Sealing member (sealing part) 122 Piston 123 Bottom 123a Bottom mounting part 123b Mounting hole 124 Cylinder head 124a Cylinder head packing 125 piston rod 125a Rod side mounting part 125b Mounting hole 125c check valve 125d Shrinkage chamber side passage 125e ​​Rear end connection section 126 Piston head 126a Connection recess 126b Passageway to the extension room 126c Piston packing 127 Shrinking Room 128 Stretching Room 131 Piping 132 fuse valve 132F First fuse valve 132R Second fuse valve 133 Piping 134 Diverter valve 135 Piping 136 Slow return check valve 137 Piping 138 Electric hydraulic pump unit 138a electric motor 138b Pump 138c filter 138d Check valve 138e Relief valve 138f solenoid valve 139 Emergency hydraulic pump unit 139a High Pump 139b Low-pressure pump 139c hand pump 139d filter 139e Check valve 139f Check valve 139g relief valve 139h Relief valve 140 Stop valve 141 Pressure gauge 142 Pressure switch 143 Hydraulic Tank

Claims

1. A wing container comprising: a container housing having wings that rotate up and down to open and close; and a pair of hydraulic cylinders having extendable piston rods connected to the wings at the front and rear of the container housing, The pair of hydraulic cylinders have compression chambers sealed from the outside of the cylinder tubes by sealing portions of the cylinder tubes, and are connected in parallel to a hydraulic circuit to rotate the wings by operating in sync. When hydraulic oil leaks into the compression chamber of any of the hydraulic cylinders, the maximum extension length of the piston rod is shortened, and the wings are twisted and opened so that the full opening angles on the front side and the rear side are different. Wing container.

2. the hydraulic cylinder includes a piston having the piston rod and a piston head having a piston packing that separates the compression chamber from an extension chamber filled with hydraulic oil, The piston has a check valve that opens at a predetermined valve opening pressure to connect the compression chamber and the extension chamber, and returns the hydraulic oil leaked into the compression chamber to the extension chamber. The wing container according to claim 1.

3. The hydraulic pump unit further includes an emergency hydraulic pump unit that supplies the hydraulic oil to the extension chamber to boost the pressure in the compression chamber to the predetermined valve opening pressure. The wing container according to claim 2.

4. Further, a fuse valve connected to the hydraulic cylinder is provided. The wing container according to any one of claims 1 to 3.

5. A hydraulic cylinder according to claim 1 or 2, Hydraulic circuit device for wing containers.

6. Further, the emergency hydraulic pump unit according to claim 3 is provided.

6. A hydraulic circuit device for a wing container according to claim 5.

7. A transport container which is a wing container according to any one of claims 1 to 4.

8. A wing truck equipped with the wing container according to any one of claims 1 to 4.

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