JP2016216146A - Quay crane and control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a quay crane and a control method capable of suppressing that earthquake vibration in a running direction is transmitted by releasing a brake of a running gear to be made into a movable state in the running direction even when blackout occurs with an earthquake.SOLUTION: In a control method of a quay crane for making a slide type boom into a state of being slidable in a traverse direction by discharging fluid inside a casing 15 of a fluid cylinder 13 to contract the fluid cylinder 13, and moving the slide type boom downward to be loaded on a roller 10 installed in a leg structure when an earthquake occurs, a power generation mechanism 30 having a turbine 31 is installed in the quay crane, the fluid to be discharged from the fluid cylinder 13 is supplied to the turbine 31 and rotated to generate power, and a brake of a running gear is released by the generated power when the earthquake occurs.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a quay crane including a sliding boom supported so as to be movable in a transverse direction transverse to the traveling direction of a traveling device, and a control method, and more particularly, when a power failure occurs with an earthquake. Further, the present invention relates to a quay crane and a control method that can suppress transmission of seismic motion in the traveling direction by releasing the brake of the traveling device so that the traveling device can move in the traveling direction.

  A leg structure on which the traveling device is installed at the lower end, a roller installed on the leg structure, and a slide disposed on the roller and supported so as to be slidable in a transverse direction transverse to the traveling direction of the traveling device Various structures including a vibration control mechanism have been proposed for a quay crane (also referred to as a low-profile crane) including a type boom (see, for example, Patent Document 1).

  Patent Document 1 proposes a quay crane that controls contact and release of a sliding boom and a roller by expansion and contraction of a fluid cylinder installed in a leg structure. When the sliding boom is fixed to the leg structure such as during cargo handling work, the quay crane extends the fluid cylinder and moves it upward while supporting the sliding boom to release the contact with the roller. When moving the sliding boom in the transverse direction, such as when the ship is berthing, the sliding boom is moved downward by contraction of the fluid cylinder and is placed on the roller. Then, the slide boom is moved in the transverse direction by winding or unwinding the wire rope connected to the slide boom.

  When an earthquake occurs, the pressure applied to the fluid cylinder is released by valve control, and the fluid cylinder is contracted by its own weight so that the slide boom can be placed on the roller and moved in the transverse direction. . Since the sliding boom can freely move in the transverse direction with respect to the leg structure, it acts as a damping mass and damps the vibration of the quay crane in the transverse direction. That is, this quay crane can obtain a vibration control effect.

  On the other hand, there is a quay crane that releases a brake by a brake mechanism installed in a traveling device when an earthquake occurs and makes the quay crane movable in a traveling direction. Since the quay crane can move freely in the traveling direction, vibrations in the traveling direction can be suppressed from being transmitted to the quay crane. That is, this quay crane can obtain a seismic isolation effect.

  In some cases, the brake mechanism may be configured so that the brake is released when electricity is supplied as a safety measure and the brake is applied when electricity is not supplied. In this case, if a power failure occurs along with the earthquake, the brake mechanism cannot release the brake, and the seismic isolation effect in the traveling direction may not be obtained.

JP 2011-152998 A

The present invention has been made in view of the above problems, and even when a power failure occurs with an earthquake, the purpose of the present invention is to release the brake of the traveling device so that it can move in the traveling direction. The object is to provide a quay crane and a control method capable of suppressing transmission of seismic motion in a direction.

  The quay crane of the present invention that achieves the above-mentioned object includes a leg structure having a sea side leg and a land side leg, and an opposing direction of the sea side leg and the land side leg attached to the lower end of the leg structure. A traveling device that travels in a traveling direction that crosses the transverse direction, a brake mechanism that applies a brake to the traveling device, a roller that is rotatably installed above the leg structure, And a sliding boom that is slidably supported in the transverse direction, and is configured to be installed on the leg structure and moved upward while supporting the sliding boom so that contact with the roller can be released. In a quay crane comprising a fluid cylinder, a first pipeline having one end connected to the fluid cylinder and having a first opening / closing valve in the middle, and a power generation mechanism connected to the other end of the first pipeline And be prepared When the earthquake occurs, the first on-off valve is opened, and the fluid inside the casing of the fluid cylinder is supplied to the turbine of the power generation mechanism through the first pipe, and is rotated to generate power. A structure for releasing the brake of the brake mechanism is provided.

  According to the quay crane control method of the present invention that achieves the above object, a fluid cylinder that moves upward while supporting a sliding boom is installed on an upper part of a leg structure having a traveling device installed at the lower end thereof. When generated, the fluid inside the casing of the fluid cylinder is discharged to contract the fluid cylinder, and the sliding boom is moved downward to be placed on a roller installed on the leg structure, and the slide In a method for controlling a quay crane in which a boom is slidable in a transverse direction as an extending direction thereof, a fluid is discharged from the fluid cylinder when an earthquake occurs by installing a power generation mechanism having a turbine in the quay crane Is supplied to the turbine and rotated to generate electric power, and the brake of the traveling device is released by the generated electricity.

  According to the present invention, even when a power failure occurs with an earthquake, power can be generated using the fluid inside the casing, and the brake can be released by this electricity. By releasing the brake, the quay crane can move in the direction of travel, and the seismic motion in the direction of travel can be suppressed from being transmitted to the quay crane. Can be obtained.

  The fluid cylinder that supplies fluid to the turbine of the power generation mechanism when an earthquake occurs is used when the sliding boom is slid in the transverse direction or fixed to the leg structure during normal times when no earthquake occurs. If there is a defect in the fluid cylinder, it can be easily found in normal times and repairs can be made, which is advantageous in avoiding problems such as a shortage of fluid as a power source when an earthquake occurs. In other words, the stability of the power source can be improved by using the power source for releasing the brake as a fluid that is used not only when an earthquake occurs but also during normal times.

  The upper end surface of the fluid cylinder is lower than the support position when the upper end surface of the fluid cylinder is moved upward while being in contact with and supported by the sliding boom to release the contact between the sliding boom and the roller. It is configured to be movable to a normal contracted position where the sliding boom is in contact with the roller, and when the first opening / closing valve is opened, the fluid cylinder is contracted while supplying the fluid from the fluid cylinder to the power generation mechanism, The upper end surface can be lowered from the support position to the normal contraction position.

According to this configuration, as the fluid cylinder contracts, the sliding boom is placed on the roller and can slide in the transverse direction. As a result, the sliding boom functions as a damping mass, so that the quay crane can obtain a damping effect in the transverse direction.

  The traveling device can include a wheel that rolls on a rail that extends in the traveling direction. By releasing the brake of the brake mechanism, the wheels can slide and roll on the rail, so that the quay crane can be easily moved in the traveling direction.

  A fluid cylinder is a cylindrical casing filled with a fluid, a rod arranged to be slidable with respect to the casing in the axial direction of the casing, and an inner chamber of the casing which is installed on the rod in the axial direction. And a piston that divides into a lower chamber and contracts when fluid is supplied to the upper chamber and extends when fluid is supplied to the lower chamber. A second conduit having a second opening / closing valve in the middle of the connection and an accumulator connected to the other end of the second conduit, and the accumulator is supplied with fluid to the upper chamber or the lower chamber. When the earthquake occurs, the second open / close valve is opened and the fluid in the accumulator is supplied to the upper chamber through the second pipe. Through the first conduit connected to The fluid cylinder is contracted by discharging the fluid in the lower chamber, and the upper end surface of the fluid cylinder is lowered to the emergency contraction position, which is lower than the normal contraction position where the sliding boom contacts the roller. be able to.

  According to this configuration, by supplying the fluid from the accumulator to the upper chamber of the fluid cylinder, the fluid cylinder can be contracted even shorter than when the fluid cylinder is contracted by the weight of the sliding boom. As a result, the flow rate of the fluid supplied from the fluid cylinder to the power generation mechanism increases, so that the amount of power generated by the power generation mechanism can be increased. In the case of an earthquake in which vibration continues for a long time, it is advantageous to maintain the brake released state for a long time.

  Even if an earthquake occurs while the sliding boom is mounted on the roller, the fluid cylinder can be contracted by supplying fluid from the accumulator to the upper chamber. Since the upper end surface of the fluid cylinder is lowered from the normal contraction position to the emergency contraction position, the fluid in the lower chamber can be supplied to the power generation mechanism to generate electric power.

  Since the fluid can be supplied to the accumulator and pressurized each time the fluid cylinder is expanded and contracted during normal times, it is advantageous for reliably supplying the fluid from the accumulator to the upper chamber when an earthquake occurs.

It is explanatory drawing which illustrates the working state of the quay crane of this invention. It is explanatory drawing which illustrates the dormant state of the quay crane of FIG. It is explanatory drawing which illustrates the quay crane of FIG. 1 by A arrow view. It is explanatory drawing which expands and illustrates the fluid cylinder vicinity of the quay crane of FIG. It is explanatory drawing which illustrates the state which the fluid cylinder of FIG. 4 contracted. It is explanatory drawing which illustrates the fluid cylinder and pressure circuit of the quay crane of FIG. It is explanatory drawing which illustrates the state at the time of the earthquake occurrence of the fluid cylinder and pressure circuit of FIG. It is explanatory drawing which illustrates another embodiment of the pressure circuit of FIG. It is explanatory drawing which illustrates the state at the time of the earthquake occurrence of the pressure circuit of FIG.

  Hereinafter, a quay crane and a control method of the present invention will be described based on the embodiments shown in the drawings. In the figure, the traveling direction of the quay crane 1 is indicated by an arrow y, the transverse direction crossing at right angles to the traveling direction y is indicated by an arrow x, and the vertical direction is indicated by an arrow z.

As illustrated in FIGS. 1 to 3, a quay crane 1 according to the present invention includes a leg structure 4 having a pair of sea-side legs 2, a pair of land-side legs 3, and a plurality of horizontal members respectively connecting the legs. , And a traveling device 5 installed at the lower end of the leg structure 4. The traveling device 5 includes a plurality of metal wheels 6 and travels on a rail 8 laid on the ground 7. The traveling device 5 travels in a traveling direction y that intersects at right angles to the transverse direction x that is the opposing direction of the sea-side leg 2 and the land-side leg 3.

  The traveling device 5 is provided with a brake mechanism 9 that brakes the traveling device 5. The brake mechanism 9 includes a rail clamp that holds the rail 8. The brake mechanism 9 is not limited to this configuration, and may have a function of braking the traveling device 5 and preventing the quay crane 1 from moving in the traveling direction y. The brake mechanism 9 includes, for example, an anchor that inserts an anchor into a through hole formed in the ground 7 to fix the quay crane 1, a drum brake that directly fixes the rotation of the wheel 6, and a combination thereof. The brake mechanism 9 may be installed on the lower surface of the leg structure 4 in addition to being installed on the traveling device 5. Therefore, it can be said that the brake mechanism 9 has a function of braking and releasing the quay crane 1.

  Above the leg structure 4, a roller 10 that is rotatably supported by a rotation shaft extending in the traveling direction y is installed. A sliding boom 11 is installed on the roller 10, and the sliding boom 11 is supported by the roller 10 so as to be slidable in a transverse direction x that is an extending direction of the sliding boom 11. The rollers 10 are respectively installed in the vicinity of the pair of sea-side legs 2 and the pair of land-side legs 3.

  As illustrated in FIG. 1, the sliding boom 11 moves to the sea side (to the right in FIG. 1) during cargo handling work for cargo to be transported such as a container with a ship 12 such as a container ship berthed on the quay. Then, it becomes a working state that protrudes. When the cargo handling work is completed and the ship 12 leaves the shore, the sliding boom 11 is located on the land side (see FIG. 2) in order to avoid contact between the bridge of the ship 12 and the sliding boom 11. Move to the left) and go to sleep.

  The sliding boom 11 placed on the roller 10 is moved by feeding and winding a wire rope (not shown). At this time, the roller 10 rotates passively by friction with the sliding boom 11. The sliding boom 11 is moved each time the ship 12 is berthed and departed, and this movement is frequently performed.

  As illustrated in FIGS. 4 and 5, in this embodiment, two rollers 10 configured as a set are installed on the inner side surfaces of the pair of sea-side legs 2. The roller 10 is similarly installed in the land side leg 3. Between the two rollers 10, for example, a hydraulic cylinder 13 such as a hydraulic cylinder or an air cylinder is installed in which the expansion and contraction direction is the vertical direction z. The number of rollers 10 installed on each of the sea-side legs 2 and the land-side legs 3 is not limited to the above and can be changed as appropriate, and may be one or three or more.

  When the sliding boom 11 is in a working state or a resting state, that is, after the movement in the transverse direction x is completed, the fluid cylinder 13 extends to support the lower surface of the sliding boom 11 as illustrated in FIG. Move to. Since the sliding boom 11 is released from contact with the roller 10 and supported by the fluid cylinder 13, the sliding boom 11 is fixed to the leg structure 4 by friction generated between the upper end surface 14 of the fluid cylinder 13 and the sliding boom 11. It will be in the state. At this time, the upper end surface 14 of the fluid cylinder 13 is positioned higher than the upper end of the roller 10 in the vertical direction z, and this position is hereinafter referred to as a support position P1.

  As long as the upper end surface 14 is configured to support the sliding boom 11 from below, the upper end surface 14 is not limited to the lower surface of the sliding boom 11 and may be configured to be in contact with other places. In the case of this configuration, when the fluid cylinder 13 supports the sliding boom 11 and releases the contact with the roller 10, the position where the upper end surface 14 is located becomes the support position P1.

  When the sliding boom 11 is moved in the transverse direction x, as illustrated in FIG. 5, the fluid cylinder 13 contracts to move the sliding boom 11 downward and contact the roller 10. Since the sliding boom 11 placed on the roller 10 is released from contact with the upper end surface 14 of the fluid cylinder 13 and is supported by the roller 10, the sliding boom 11 is movable in the transverse direction x. At this time, the upper end surface 14 of the fluid cylinder 13 is at the same height or lower position as the upper end of the roller 10 in the vertical direction z, and this position is hereinafter referred to as a normal contraction position P2.

  When the upper end surface 14 supports other than the lower surface of the sliding boom 11, the position of the upper end surface 14 of the fluid cylinder 13 when the sliding boom 11 contracts to a state in contact with the roller 10 is the normal contraction position P2. Become.

  As illustrated in FIG. 4, when an earthquake occurs when the fluid cylinder 13 is extended and the sliding boom 11 is fixed, the fluid cylinder 13 is pushed downward and contracted by the weight of the sliding boom 11. The upper end surface 14 of the fluid cylinder 13 is lowered to the normal contraction position P2 illustrated in FIG. Due to the contraction of the fluid cylinder 13, the sliding boom 11 is placed on the roller 10 and can move in the transverse direction x.

  The size of the fluid cylinder 13 can be changed as appropriate depending on the weight of the sliding boom 11 and the like. For example, the fluid cylinder 13 has a cylindrical shape with a diameter of about 200 to 500 mm, and the distance from the support position P1 to the normal contraction position P2 is about 50 to 200 mm. be able to.

  As illustrated in FIGS. 6 and 7, the fluid cylinder 13 includes a cylindrical casing 15 that is filled with a fluid, and a rod 16 that is slidably disposed with respect to the casing 15 in the axial direction of the casing 15. The piston 16 is installed on the rod 16 and divides the inside of the casing 15 into an upper chamber 17 and a lower chamber 18 in the axial direction.

  In this embodiment, the casing 15 is fixed to the leg structure 4 side, and the upper end surface 14 of the rod 16 supports the sliding boom 11. The installation direction of the fluid cylinder 13 is not limited to this configuration. For example, the rod 16 is fixed to the leg structure 4 side in an inverted state, and the sliding boom 11 is supported by using the end surface of the casing 15 as the upper end surface 14. It may be.

  A pressure circuit 20 such as a hydraulic circuit connected to the fluid cylinder 13 includes a tank 21 for storing a fluid such as oil supplied to the fluid cylinder 13, a supply pipe 22 having one end connected to the tank 21, and a supply pipe 22. A pump 23 installed on the way and a switching valve 24 connected to the other end of the supply pipe 22 are provided. The pressure circuit 20 includes a lower chamber pipe 25 that connects the switching valve 24 and the lower chamber 18 of the fluid cylinder 13, an upper chamber pipe 26 that connects the upper chamber 17 of the fluid cylinder 13 and the switching valve 24, and a switching valve. And a recovery pipe 27 for connecting the tank 24 and the tank 21.

  The switching valve 24 is composed of, for example, a solenoid valve. The solenoid valve of this embodiment has a configuration in which the pipes to be communicated are switched by supplying electricity, and when electricity is not supplied due to a power failure or the like, the solenoid valve is stopped at a neutral position where each pipe is closed by an attached spring. The switching valve 24 is not limited to this configuration, and has a function of selectively supplying the fluid supplied from the supply pipe 22 to the lower chamber pipe 25 or the upper chamber pipe 26 to control the expansion and contraction of the fluid cylinder 13. For example, other valves may be used.

When extending the fluid cylinder 13, the supply pipe 22 and the lower chamber pipe 25 are communicated by switching the switching valve 24, and the fluid is supplied to the lower chamber 18 via the pump 23. Pump 2
The size of 3 can be appropriately changed depending on the size of the fluid cylinder 13 and the weight of the sliding boom 11 to be supported by the fluid cylinder 13. For example, when the fluid cylinder 13 is installed on each of the four legs of the quay crane 1 and the diameter of the fluid cylinder 13 is 350 mm and the weight of the sliding boom 11 is about 500 t, it is 10 to 30 MPa, preferably 20 to 25 MPa. A pump 23 capable of supplying fluid with pressure is installed.

  The lower chamber 18 to which the fluid is supplied expands and pushes up the piston 19, so that the fluid cylinder 13 extends. On the other hand, since the upper chamber pipe 26 and the recovery pipe 27 communicate with each other by switching the switching valve 24, the fluid moves from the reduced upper chamber 17 to the tank 21 as the fluid cylinder 13 extends.

  After the upper end surface 14 of the fluid cylinder 13 rises to the support position P1, the lower chamber piping 25 and the upper chamber piping 26 are closed by switching the switching valve 24. Since the lower chamber 18 is sealed by the switching valve 24 and the pressure of the internal fluid is maintained, the sliding boom 11 supported by the upper end surface 14 at the support position P <b> 1 is maintained in a state where it does not contact the roller 10.

  When contracting the fluid cylinder 13, the supply pipe 22 and the upper chamber pipe 26 are connected by switching the switching valve 24, and the fluid is supplied to the upper chamber 17 via the pump 23. As the upper chamber 17 expands, the piston 19 is pushed down and the fluid cylinder 13 contracts. The fluid discharged from the lower chamber 18 to be reduced is collected in the tank 21 through the lower chamber pipe 25, the switching valve 24 and the collection pipe 27. When the fluid cylinder 13 is contracted, the fluid cylinder 13 may be contracted by the weight of the sliding boom 11 without operating the pump 23 only by switching the switching valve 24.

  After the upper end surface 14 of the fluid cylinder 13 is lowered to the normal contraction position P2, the ends of the lower chamber pipe 25 and the upper chamber pipe 26 are closed by switching the switching valve 24. Since the upper end surface 14 is lowered to the normal contraction position P <b> 2, the sliding boom 11 is in contact with the roller 10.

  The pressure circuit 20 of the quay crane 1 according to the present invention is installed in the middle of the discharge pipe 28 and the discharge pipe (first pipe line) 28 having one end connected to the lower chamber 18 of the fluid cylinder 13 in addition to the above configuration. A first open / close valve 29 and a power generation mechanism 30 connected to the other end of the discharge pipe 28. The power generation mechanism 30 includes a turbine 31 that converts kinetic energy of a fluid that passes through the discharge pipe 28 into electricity, and a dynamo 32 that is coupled to the rotating shaft of the turbine 31. The first opening / closing valve 29 is constituted by a solenoid valve, for example. The first opening / closing valve 29 is not limited to this configuration, and may be configured by other valves as long as the first opening / closing valve 29 has a function of closing the discharge pipe 28 and opening it when an earthquake occurs.

  The turbine 31 is constituted by a water wheel that rotates by the kinetic energy of the fluid passing through the discharge pipe 28, and the dynamo 32 connected to the turbine 31 generates electricity by the rotation of the turbine 31. The fluid that has passed through the turbine 31 is returned to the tank 21. The power generation mechanism 30 is connected to the brake mechanism 9 by a cable 33.

  When an earthquake occurs when the fluid cylinder 13 extends and the upper end surface 14 is at the support position P1, the first opening / closing valve 29 is opened along with the occurrence of the earthquake. The first opening / closing valve 29 is configured to open based on a signal from, for example, an acceleration sensor installed in the quay crane 1 or the like or an emergency earthquake warning. Further, when the power supply to the first opening / closing valve 29 is interrupted due to a power failure, the spring is automatically opened by the spring provided.

As illustrated in FIG. 7, at this time, the switching valve 24 is in a state in which each pipe line is closed. When the first opening / closing valve 29 is opened, fluid flows from the lower chamber 18 inside the casing 15 into the turbine 31 through the discharge pipe 28, so that the pressure in the lower chamber 18 is released and the fluid pushed by the weight of the sliding boom 11. The rod 16 of the cylinder 13 is lowered. The upper end surface 14 of the fluid cylinder 13 is pushed by the sliding boom 11 and descends from the support position P1 toward the normal contraction position P2.

  When the fluid filled in the fluid cylinder 13 is composed of a fluid whose volume hardly changes with pressure change, such as oil or water, a valve or the like that can take outside air into the casing 15 or the upper chamber pipe 26 is provided. It may be installed so that outside air is taken into the upper chamber 17 when the fluid cylinder 13 contracts. With this configuration, when the fluid cylinder 13 contracts, the inside of the upper chamber 17 is avoided from being in a low pressure state, and the fluid cylinder 13 is easily contracted. As long as the pressure change in the upper chamber 17 can be eliminated when the fluid cylinder 13 contracts, the configuration is not limited to the configuration in which the valve for taking in the outside air is installed, and other configurations may be adopted.

  When the lowered sliding boom 11 comes into contact with the roller 10, the rod 16 is not pushed further downward, so that the upper end surface 14 stops at the normal contraction position P2. Since the fluid in the lower chamber 18 is supplied to the turbine 31 via the discharge pipe 28, the turbine 31 is rotated by the passing fluid, and this rotation is transmitted to the dynamo 32. The configuration of the power generation mechanism 30 is not limited to the combination of the turbine 31 and the dynamo 32, and may have a configuration in which power is generated by the fluid passing through the discharge pipe 28. For example, a coil may be installed instead of the dynamo 32 and a magnet may be installed in the turbine 31 to generate power in a non-contact manner by electromagnetic induction.

  The electricity generated by the dynamo 32 is supplied to the brake mechanism 9 via the cable 33, and the brake mechanism 9 uses this electricity as power to release the brake. When the brake mechanism 9 is composed of a rail clamp, the clamp 8 is opened by the supplied power to open the rail 8. When the brake mechanism 9 is composed of an anchor, the anchor is pulled out from the through hole of the ground 7 using electricity as power.

  The quay crane 1 whose brake has been released becomes movable in the traveling direction y when the wheel 6 slides on the rail 8 or rolls. Can be prevented from being transmitted to

  The wheel 6 of the traveling device 5 is not limited to the metal wheel 6 that rolls on the rail 8, but may be a rubber tire that rolls on the ground 7. In this case, by releasing the brake by the brake mechanism that directly restrains the rubber tire with the generated electricity, the rubber tire can be rolled, and the seismic motion in the traveling direction y can be suppressed from being transmitted to the quay crane 1.

  Since the brake can be released by electricity generated by the power generation mechanism 30, the quay crane 1 can be moved in the traveling direction y even when the power source is lost along with the earthquake. It is advantageous for improving the seismic isolation performance of the quay crane 1.

  The fluid cylinder 13 that supplies fluid to the turbine 31 when an earthquake occurs is used when the sliding boom 11 is normally slid in the transverse direction x or fixed to the leg structure 4. If there is a problem with the fluid cylinder 13 or the pressure circuit 20, etc., it can be easily known at normal times and repairs can be made. Therefore, there is a shortage of fluid as a power source for releasing the brake in the event of an earthquake. It is advantageous to avoid problems. In other words, the stability of the power source can be improved by using the power source for releasing the brake as a fluid that is used not only when an earthquake occurs but also during normal times. Since frequent maintenance of the fluid cylinder 13 and the pressure circuit 20 is not required, it is advantageous for suppressing the maintenance cost of the quay crane 1.

  As illustrated in FIGS. 8 and 9, an auxiliary pipe (second pipe line) 34 is connected between the supply pipe 22 and the upper chamber 17, and the accumulator 35 is sequentially connected to the auxiliary pipe 34 from the side close to the pump 23. The second opening / closing valve 36 may be installed. The accumulator 35 has a function of storing a fluid such as oil, water, or air. The second opening / closing valve 36 is constituted by a solenoid valve, for example, like the first opening / closing valve 29. The second opening / closing valve 36 is not limited to this configuration, and may be configured by other valves as long as it has a function of closing the auxiliary pipe 34 and opening it when an earthquake occurs.

  In this embodiment, a check valve 37 is installed in the middle of the auxiliary pipe 34 and between the pump 23 and the accumulator 35. The check valve 37 has a function of preventing the fluid from flowing back from the accumulator 35 to the pump 23.

  When the sliding boom 11 is moved, fluid is supplied from the pump 23 to the upper chamber 17 of the fluid cylinder 13 through the switching valve 24 as illustrated in FIG. As the upper chamber 17 to which the fluid is supplied is expanded, the rod 16 is lowered, so that the fluid cylinder 13 contracts. At this time, the upper end surface 14 of the fluid cylinder 13 is lowered to the normal contraction position P2.

  At the same time, fluid is supplied from the pump 23 to the accumulator 35. Since the second opening / closing valve 36 is closed during normal times when no earthquake occurs, fluid is supplied from the pump 23 to the accumulator 35 and pressurized. After the contraction of the fluid cylinder 13 is completed, the pump 23 is stopped, and the upper chamber pipe 26 and the lower chamber pipe 25 are closed by the switching valve 24. At this time, one of the accumulators 35 is closed by the second opening / closing valve 36 and the other is closed by the check valve 37, so that the pressure of the fluid in the accumulator 35 is maintained.

  When the fluid cylinder 13 is extended and the sliding boom 11 is fixed to the leg structure 4, the fluid is supplied to the accumulator 35 and pressurized as described above. That is, the accumulator 35 is supplied with a fluid and pressurized each time the fluid cylinder 13 is controlled to expand and contract.

  When an earthquake occurs when the upper end surface 14 of the fluid cylinder 13 is at the normal contraction position P2, such as during the movement of the sliding boom 11, the first opening / closing valve 29 and the second opening / closing valve 36 are accompanied by the occurrence of the earthquake. Is released.

  Similar to the first opening / closing valve 29, the second opening / closing valve 36 is configured to open based on a signal from, for example, an acceleration sensor installed in a quay crane 1 or an emergency earthquake warning. In addition, when the power supply to the second opening / closing valve 36 is interrupted due to a power failure, it is automatically opened by a spring provided.

  As illustrated in FIG. 9, when the second opening / closing valve 36 is opened, fluid is supplied from the accumulator 35 to the upper chamber 17 of the fluid cylinder 13, and the fluid cylinder 13 contracts. At this time, the upper end surface 14 of the fluid cylinder 13 descends to the emergency contraction position P3 lower than the normal contraction position P2.

  As the fluid cylinder 13 contracts, the fluid is discharged from the lower chamber 18 and supplied to the turbine 31 through the opened first opening / closing valve 29. As a result, the power generation mechanism 30 generates power, and the brake mechanism 9 supplied with electricity from the power generation mechanism 30 releases the brake of the traveling device 5.

When the upper end surface 14 of the fluid cylinder 13 is in the normal contracted position P2, that is, while the sliding boom 11 is being moved, the sliding boom 11 is in contact with the roller 10, so the sliding boom 11 does not push the rod 16 downward any more. Therefore, even if the first opening / closing valve 29 is opened due to the occurrence of an earthquake, there is a possibility that sufficient fluid cannot be supplied from the lower chamber 18 to the turbine 31.

  In this embodiment, by supplying a fluid from the accumulator 35 to the upper chamber 17 when an earthquake occurs, the upper end surface 14 of the fluid cylinder 13 can be moved to a position lower than the normal contraction position P2. Due to the contraction of the fluid cylinder 13, a sufficient amount of fluid can be supplied from the lower chamber 18 to the turbine 31, so that it is possible to sufficiently generate electric power for releasing the brake of the brake mechanism 9.

  The accumulator 35 is supplied with fluid and pressurized each time the fluid cylinder 13 is extended or contracted. Therefore, it becomes easy to maintain the fluid in the accumulator 35 at a high pressure.

  When the sliding boom 11 is fixed to the leg structure 4, that is, when an earthquake occurs when the upper end surface 14 of the fluid cylinder 13 is at the support position P <b> 1, the fluid cylinder 13 is pushed in by the weight of the sliding boom 11. In addition to contracting, it is contracted by supplying fluid from the accumulator 35 to the upper chamber 17. The upper end surface 14 is lowered from the support position P1 to the emergency contraction position P3.

  Compared with the embodiment in which the accumulator 35 is not installed, the flow rate of the fluid discharged from the lower chamber 18 increases, so the amount of power generated by the power generation mechanism 30 increases. Since the amount of electricity supplied to the brake mechanism 9 can be increased and the brake can be released for a longer time, the quay crane 1 will continue to release the brake and have a seismic isolation effect even if long-term earthquake motion occurs. Can be obtained.

DESCRIPTION OF SYMBOLS 1 Quay crane 2 Sea side leg 3 Land side leg 4 Leg structure 5 Traveling device 6 Wheel 7 Ground 8 Rail 9 Brake mechanism 10 Roller 11 Sliding boom 12 Ship 13 Fluid cylinder 14 Upper end surface 15 Casing 16 Rod 17 Upper chamber 18 Lower Chamber 19 Piston 20 Pressure circuit 21 Tank 22 Supply piping 23 Pump 24 Switching valve 25 Lower chamber piping 26 Upper chamber piping 27 Recovery piping 28 Discharge pipe (first pipe)
29 First open / close valve 30 Power generation mechanism 31 Turbine 32 Dynamo 33 Cable 34 Auxiliary pipe (second pipe)
35 Accumulator 36 Second open / close valve 37 Check valve P1 Support position P2 Normal contraction position P3 Emergency contraction position

Claims (7)

A leg structure having a sea-side leg and a land-side leg, and a run in a running direction that is attached to the lower end of the leg structure and crosses the transverse direction that is the opposite direction of the sea-side leg and the land-side leg A traveling device, a brake mechanism that brakes the traveling device, a roller that is rotatably installed on the upper portion of the leg structure, and a roller that is disposed on the roller and is slidably supported in the transverse direction. A quay crane comprising: a sliding boom, and a fluid cylinder that is installed on the leg structure and configured to move upward while supporting the sliding boom and to be able to release contact with the roller.
A first conduit having a first opening / closing valve in the middle of which one end is connected to the fluid cylinder, and a power generation mechanism connected to the other end of the first conduit;
When an earthquake occurs, the first open / close valve is opened, and the fluid inside the casing of the fluid cylinder is supplied to the turbine of the power generation mechanism through the first pipe, and is rotated to generate power. A quay crane comprising a structure for releasing a brake of a brake mechanism. The upper end surface of the fluid cylinder is moved upward while contacting and supporting the sliding boom by extension of the fluid cylinder, and a support position for releasing the contact between the sliding boom and the roller; and A position lower than the support position, and the sliding boom is configured to be movable to a normal contracted position in contact with the roller;
2. When the first open / close valve is opened, the fluid cylinder is contracted while supplying fluid from the fluid cylinder to the power generation mechanism, and the upper end surface is lowered from the support position to the normal contraction position. Wharf crane as described in   The quay crane according to claim 1 or 2, wherein the traveling device includes a wheel that rolls on a rail that extends in the traveling direction. The fluid cylinder is a cylindrical casing filled with a fluid, a rod arranged to be slidable with respect to the casing in the axial direction of the casing, and the shaft installed inside the casing to the shaft. A piston that divides into an upper chamber and a lower chamber in a direction, and contracts when fluid is supplied to the upper chamber and extends when fluid is supplied to the lower chamber;
The quay crane is provided with a second conduit having a second opening / closing valve in the middle with one end connected to the upper chamber, and an accumulator connected to the other end of the second conduit,
The accumulator is configured to supply and pressurize fluid simultaneously when fluid is supplied to the upper chamber or the lower chamber,
When an earthquake occurs, the second open / close valve is opened, and the fluid in the accumulator is supplied to the upper chamber through the second conduit, and the first conduit connected to the lower chamber is used to supply the fluid. By contracting the fluid cylinder by discharging the fluid in the lower chamber,
4. The quay crane according to claim 1, wherein the upper end surface of the fluid cylinder is lowered to an emergency contraction position that is lower than a normal contraction position where the sliding boom contacts the roller. A fluid cylinder that moves upward while supporting a sliding boom is installed on the upper part of the leg structure having a traveling device installed at the lower end, and the fluid inside the casing of the fluid cylinder is discharged when an earthquake occurs to discharge the fluid. A state in which the cylinder is contracted and the sliding boom is moved downward and placed on a roller installed on the leg structure, so that the sliding boom can be slid in a transverse direction that is an extending direction thereof. In the quay crane control method,
A power generation mechanism having a turbine is installed in the quay crane, and when the earthquake occurs, fluid discharged from the fluid cylinder is supplied to the turbine and rotated to generate power, and the brake of the traveling device is released by the generated electricity. A control method for a quay crane characterized by the above.   When supplying fluid from the fluid cylinder to the turbine, the upper end surface of the fluid cylinder is lower than the support position from a support position that supports the sliding boom and releases the contact with the roller. 6. The quay crane control method according to claim 5, wherein the sliding boom is lowered to a normal contracted position where it contacts the roller. A rod that slidably moves in the axial direction of the casing in the cylindrical casing that is filled with fluid, and the piston that divides the interior of the casing into an upper chamber and a lower chamber is disposed on the rod. As a configuration that contracts when fluid is supplied to the upper chamber and expands when fluid is supplied to the lower chamber,
When supplying fluid to the upper chamber or the lower chamber, an accumulator that is supplied and pressurized at the same time is connected to the upper chamber, and fluid is supplied from the accumulator to the upper chamber when an earthquake occurs. 7. The quay according to claim 5, wherein the fluid cylinder is contracted and the upper end surface of the fluid cylinder is lowered to an emergency contraction position that is lower than a normal contraction position where the sliding boom contacts the roller. Crane control method.

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