JP5127334B2 - Airtightness and expansion / contraction structure of expansion / contraction part, bulk cargo handling device, and airtight holding and expansion / contraction method of expansion / contraction part - Google Patents

Description

  The present invention relates to an airtight and stretchable structure of a stretchable part capable of avoiding the inflow of combustible gas and the inflow of air in the stretchable part when handling bulky cargo that generates flammable gas, etc. The present invention relates to an airtight holding and expansion / contraction method of an expansion / contraction part.

  In recent years, it has been considered to hydrate natural gas and transport this solid natural gas hydrate (NGH) as bulk cargo. When solid cargoes that generate flammable gas such as natural gas hydrate are transported as bulk cargo on bulk carriers, these solid materials that generate flammable gas are transported to land bases and bulk carriers. A dedicated bulk cargo handling device is required for cargo handling between the two.

  With regard to such a bulk cargo handling device, as a device for lifting and handling methane gas hydrate in a dry state, methane gas hydrate pellets are sucked by exhausting methane gas from a flexible suction pipe with an exhaust pump, and an exhaust port When the methane gas hydrate pellets accelerated by the nozzle part before are passed through the openable / closable diaphragm, high-pressure methane gas is jetted from the transfer methane gas jet nozzle and transported in the pipe, so that antifreeze liquid, low-temperature liquefied gas, etc. There has been proposed a methane gas hydrate pellet unloading apparatus that unloads and transports a carrier ship or storage tank in a dry state without using a liquid refrigerant (see, for example, Patent Document 1).

  However, this device sucks and conveys methane gas hydrate by the flow of methane gas, and because it is a solid-gas mixed transport in the pipe, it is suitable for transporting very short distances such as cargo collection in the hold, For transport over a relatively long distance, the amount of methane gas used is large, which is not suitable.

  In addition, the offshore offloading device includes a vertical conveyor that receives solids from the first offshore floating body side, a horizontal conveyor that receives the solids raised by the vertical conveyor at the receiving unit and transfers the solids to the tip, and a The shooter is arranged in the vicinity of the front end portion and leads to the second offshore floating body while dropping solids, and the shooter has elasticity to absorb relative displacement between the first offshore floating body and the second offshore floating body. A solid material such as natural gas hydrate pellets, which are formed in a bellows structure, is transferred between multiple offshore floating bodies such as offshore production facilities and transport ships while absorbing relative displacement between offshore floating bodies caused by sea conditions. Has also been proposed (see, for example, Patent Document 2).

  However, this device is suitable for relatively large relative displacements such as cargo handling between a plurality of offshore floating bodies. However, since the cargo handling device becomes large-scale, a cargo ship berthed on the quay for cargo handling. This is not always optimal when relatively small relative displacements occur, such as cargo handling between a ship and a land base.

  Therefore, the present inventors have considered an apparatus as shown in FIGS. 3 and 4 as the bulk cargo handling apparatus between the land transportation base and the cargo ship with respect to the bulk cargo handling apparatus. When the natural gas hydrate A is loaded from the transport base 3 on the land 4 to the cargo hold 2a of the bulk cargo ship 2, the bulk cargo handling apparatus 1 is loaded on the rail 4a on the land 4 to the cargo hold 2a. It moves with the support cart 10 which travels on. After that, the connecting portion 20a of the upper conveying portion 20 of the bulk cargo handling device 1 is connected to the mounting portion 3a of the nearest conveying base 3, and the natural gas hydrate A is transferred from the conveying base 3 to the upper conveying portion 20, It is conveyed to the hold 2a via the vertical conveyance unit 40, the lower conveyance unit 30, and the vertical telescopic conveyance unit 50. In the case of this loading / unloading, a horizontal conveyor etc. are used for the horizontal movement of the upper conveyance part 20 and the lower conveyance part 30, and a natural fall, a vertical conveyor, etc. are used for the downward movement of the vertical conveyance part 40 and the vertical expansion-contraction conveyance part 50. . At this time, in order to uniformly load the hold 2a in a plane, the lower transfer unit 30 is turned in the direction of the arrow in FIG.

  When the hold 2a reaches the load, the cargo handling target is set to the next hold 2a. When this next hold 2a is within the turning range of the upper transfer unit 20 and the lower transfer unit 30, the transfer base 3 is not changed, and the turn hold 2a is simply changed by turning the upper transfer unit 20 and the lower transfer unit 30. Carry out loading and unloading. When the next hold 2a is not within the turning range of the upper transfer unit 20 and the lower transfer unit 30, the connecting portion 20a of the upper transfer unit 20 is detached from the mounting portion 3a of the transfer base 3, and the carriage is moved to the next hold 2a. 10 is run on the rail 4a, and the upper transport unit 20 is connected again to the nearest transport base 3 to perform the same cargo handling. In the unloading, the natural gas hydrate A is transferred from the hold 2a to the land by an apparatus in which a horizontal transfer unit and a vertical transfer unit are appropriately combined in the same manner as the loading operation.

  When natural gas hydrate is handled as bulk cargo in this way, flammable gas is generated from natural gas hydrate, so that the entire conveyance path of the bulk cargo handling device 1 is kept airtight, It is necessary to prevent leakage into the air and air flow into the interior. In particular, the vertical telescopic conveyance unit 50 has a vertical distance because the distance between the lower conveyance unit 30 and the hold 2a changes due to changes in the water level due to changes in sea conditions such as tide levels and changes in draft due to the amount of cargo. The telescopic transport unit 50 is required to be able to expand and contract in the vertical direction (vertical direction) while maintaining sufficient airtightness.

However, if this opening is a small opening, it is relatively easy to align the airtight function and the expansion / contraction function, but the natural gas hydrate of the vertical expansion / contraction conveyance unit 50 of the bulk cargo handling apparatus 1 is in the vertical direction. Since the diameter of the portion that passes through is assumed to be about 1 m or more, there is a problem that it is difficult to ensure airtightness and stretchability in the vertical stretchable conveying section having a large diameter.
JP 2004-131272 A JP 2006-15910 A

  The present invention has been made in order to solve the above-described problem, and its purpose is in an expansion / contraction part such as a bulk cargo handling apparatus for bulk cargo that generates combustible gas such as natural gas hydrate, A relatively simple structure that combines an airtight function and an expansion / contraction function, and an airtightness and expansion / contraction structure of an expansion / contraction part that can ensure airtightness and expansion / contraction, a bulk cargo handling device, and an airtight holding and expansion / contraction method of the expansion / contraction part It is to provide.

In order to achieve the above object, the airtight and stretchable structure of the stretchable part of the present invention has a plurality of cylindrical bodies partially overlapped and arranged continuously in the vertical direction, and these cylindrical bodies overlap each other. In the stretchable part that changes the length of the entire cylindrical body by changing the length of the part, an airtight structure by liquid sealing is provided in the overlapping part, and three or more cylindrical bodies are provided. Provided, the upper partition part is also used as a liquid reservoir part, and the partition part also serving as the liquid reservoir part of the upper cylindrical body is inserted into the liquid reservoir part of the lower cylindrical body, and the lower cylindrical body The liquid reservoir part is divided into an inner peripheral side chamber and an outer peripheral side chamber, and the inner peripheral side chamber and the lower part of the outer peripheral side chamber are connected so that liquid flows, and the liquid storage part is placed in the liquid reservoir part of the lower cylindrical body. Liquid between the upper part of the inner chamber and the upper part of the outer chamber. By changing the insertion depth of the partition that also serves as the liquid reservoir of the upper cylindrical body into the liquid reservoir of the lower cylindrical body, It is comprised so that the length of an up-down direction may be changed . The liquid seal does not mean that the liquid is contained, but means that the gas is sealed with the liquid, in other words, the airtightness is maintained by the liquid accumulated in the liquid reservoir.

  According to this configuration, since it is liquid-sealed, even if the upper cylindrical body and the lower cylindrical body move relatively up and down, airtightness can be easily maintained, so not only a small opening Even in a large opening, airtightness can be constantly secured. Further, since the liquid seal portion is accommodated only by the outer peripheral side portion of the connection portion between the upper cylindrical body and the lower cylindrical body, the structure can be simplified. Moreover, it can also be used as a structure for vertical expansion and contraction. Moreover, since the resistance for airtightness in the expansion / contraction portion due to the vertical movement is also the resistance due to the viscosity of the liquid, it can be made very small when the vertical speed of expansion / contraction is slow.

Incidentally, the cylindrical body may have a configuration in which the partition of the upper can be inserted into the liquid reservoir below the cylindrical body, the cross-sectional shape of the tubular body is not limited to a circular, elliptical, polygonal, etc., any The shape may also be Since the liquid is used, the expansion / contraction direction is preferably the vertical direction (vertical direction). However, by devising the shape of the liquid reservoir and the shape of the partition, the expansion / contraction can be performed with respect to the direction inclined to some extent from the vertical direction. It can also be applied to.

  Further, in this configuration, the liquid reservoir provided in the lower cylindrical body can be easily formed by the structure of the double tube and the bottom, and the upper cylindrical body partition is the lower end side of the wall surface of the cylindrical body. Etc. can be easily formed. And when the partition part formed in the lower end side etc. of an upper cylindrical body is inserted in the liquid reservoir part formed by the double pipe of this lower cylindrical body, and liquid is put into this liquid reservoir part The gas can be sealed by the U-shaped tube effect of the liquid formed in the liquid reservoir.

Further, according to this configuration, airtightness and stretchability can be easily secured even in the stretchable portion formed by three or more cylindrical bodies.

  And as a liquid for liquid sealing put into a liquid reservoir part, antifreeze liquid, seawater, water, etc. can be considered. In addition, if seawater or water is used, it can be used easily, and even if liquid for liquid sealing leaks out, contamination of the sea area and water area can be avoided, and liquid sealing liquid is secured. Therefore, the problem of environmental pollution and the problem of storage of liquid for sealing can be avoided.

  Normally, the amount of change in the volume of the liquid reservoir due to the amount of insertion of the partition into the liquid reservoir due to the amount of expansion / contraction of the expansion / contraction part and the decrease due to evaporation or leakage of the liquid for liquid sealing are automatically calculated. In order to compensate, a liquid replenishing tank is connected to the liquid reservoir by a pipe from the outside, and the liquid is replenished while monitoring the liquid level. As a result, the amount of liquid in the liquid reservoir is always kept appropriate, and an abnormal internal pressure is detected by detecting an abnormal rise or fall in the liquid level.

  When the pressure difference between the internal pressure and the external pressure (atmospheric pressure) is large, it is preferable to use a liquid with a large specific gravity. When the pressure fluctuation of the internal pressure is large, a liquid with a large viscosity is used to change the liquid level. Is preferably reduced. In addition, it is not desirable that the liquid used for liquid sealing evaporates or burns in the event of a fire. For example, liquids may be provided in multiple layers.

  Further, in the airtight and telescopic structure of the expansion / contraction part described above, if a cover that covers the inner peripheral side chamber is provided in the liquid storage part so that a transported object that passes through the inside of the cylindrical body does not enter, the liquid storage part It is possible to prevent the occurrence of troubles such as a part to be transported such as natural gas hydrate pellets entering the part and the transported object being sandwiched by a part having an airtight function or the like with a very simple structure. In other words, it is possible to always keep airtightness by a simple cover having no complicated structure or control.

  In the airtight and stretchable structure of the expansion / contraction part, when the liquid sealing liquid put in the liquid reservoir is circulated, the liquid sealing liquid can be used even in the case of low-temperature cargo such as natural gas hydrate. The liquid can be prevented from freezing. In this circulation, a new liquid may be supplied and circulated by a circulation pipe and a circulation pump, or may be recirculated between the liquid reservoir and the heat exchange part that is outside the liquid reservoir. . In this recirculation, the circulation pipe may also serve as the heat exchange unit.

  And the bulk cargo handling apparatus of this invention for achieving said objective is comprised including the airtight and expansion-contraction structure of said expansion-contraction part. With this configuration, it is possible to ensure the airtightness and stretchability of the expansion / contraction part of the bulk cargo handling device, so that even if flammable gas is generated, it will not leak out of the bulk cargo handling device and vice versa. In addition, outside air does not enter the bulk cargo handling device. Therefore, when bulk goods which generate combustible gas, such as natural gas hydrate, are conveyed with this bulk cargo handling device, they can be safely transported while being cut off from the outside air.

  In addition, the airtightness and the expansion / contraction structure of the expansion / contraction part of the present invention described above is an optimum structure for a bulk cargo handling device used when conveying bulk cargo such as natural gas hydrate pellets, but other devices. And can be applied to a portion that requires airtightness at the stretchable portion.

And the airtight maintenance and expansion / contraction method of the expansion / contraction part of the present invention for achieving the above object is the airtight and expansion / contraction structure of the expansion / contraction part provided with three or more cylindrical bodies, and the upper partition part is a liquid reservoir part. The partition that also serves as the liquid reservoir of the upper cylindrical body is inserted into the liquid reservoir of the lower cylindrical body, and the liquid reservoir of the lower cylindrical body is inserted into the inner peripheral chamber and the outer peripheral chamber. And the upper part of the inner peripheral side chamber and the upper part of the outer peripheral side chamber are made to communicate with each other so that liquid flows through the inner peripheral side chamber and the lower part of the outer peripheral side chamber. By airtight between the upper part by liquid sealing, by changing the insertion depth of the partition part also serving as the liquid reservoir part of the upper cylindrical body into the liquid reservoir part of the lower cylindrical body, It is a method of changing the vertical length of the entire tubular body According to this method, since it is liquid-sealed, even if the upper cylindrical body and the lower cylindrical body move relatively up and down, the airtightness can be easily maintained, and even if the opening is large. Airtightness and stretchability can be constantly secured.

  According to the airtightness and expansion / contraction structure of the expansion / contraction part of the present invention, the bulk cargo handling device, and the airtight holding and expansion / contraction method of the expansion / contraction part, the airtightness and elasticity of the expansion / contraction part can be ensured with a very simple configuration. In these structures, since it is an airtight structure by liquid sealing, it becomes a static device, so that precise control, complicated maintenance, and the like are unnecessary. Furthermore, since the liquid seal portion can be accommodated only in the vicinity of the outer periphery of the stretchable portion, and can also be used as a structure for stretching, the structure of the stretchable portion can be remarkably simplified.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of an airtightness and expansion / contraction structure of an extension / contraction part, a bulk cargo handling device, and an airtight holding / extension method of an extension / contraction part according to the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show an airtight and elastic structure of a vertical expansion / contraction conveyance unit (expansion / contraction unit) 50 in the bulk cargo handling apparatus 1 according to the embodiment of the present invention. FIGS. 3 and 4 illustrate the implementation of the present invention. The bulk cargo handling apparatus 1 of the form is shown. 5 and 6 show the structure of the connecting portions 3a and 20a, and FIGS. 7 and 8 show the structure of the turning portion 5.

  First, the bulk cargo handling apparatus 1 according to the embodiment of the present invention will be described. As shown in FIG. 3 and FIG. 4, this bulk cargo handling apparatus 1 is configured to bulk load cargo A that generates flammable gas such as natural gas hydrate (NGH) with bulk 4 transportation base 3. It is a device for cargo handling such as loading and unloading between the cargo hold 2a of the cargo ship 2.

  In this bulk cargo handling apparatus 1, during cargo handling, the cargo is moved by the support cart 10 that travels on the rails 4a on the land 4 by the wheels 11 to the cargo hold 2a. After that, the connecting portion 20a of the upper conveying portion 20 of the bulk cargo handling device 1 is connected to the mounting portion 3a of the nearest conveying base 3, and the natural gas hydrate A is transferred from the conveying base 3 to the upper conveying portion 20, It is conveyed to the hold 2a via the vertical conveyance unit 40, the lower conveyance unit 30, and the vertical telescopic conveyance unit 50.

  In the case of this loading / unloading, the horizontal movement of the upper conveyance unit 20 and the lower conveyance unit 30 is performed as shown in FIG. 7 by the first conveyance device (horizontal conveyor) 21 of the upper conveyance unit 20 or the first conveyance of the lower conveyance unit 30. No. 2 transport device (horizontal conveyor) 31 or the like is used, and the downward movement of the vertical transport unit 40 and the vertical telescopic transport unit 50 uses natural fall or a vertical conveyor. At this time, the lower conveyance unit 30 is swung in a horizontal plane with the vertical conveyance unit 40 as a rotation axis, and is loaded evenly in the hold 2a.

  When this cargo hold 2a reaches the loaded amount, the cargo handling target is set to the next hold 2a. When this next hold 2a is within the turning range of the upper transfer unit 20 and the lower transfer unit 30, the transfer base 3 is not changed, and the turn hold 2a is simply changed by turning the upper transfer unit 20 and the lower transfer unit 30. Carry out loading and unloading. When the next hold 2a is not within the turning range of the upper transfer unit 20 and the lower transfer unit 30, the connection 20a of the upper transfer unit 20 is detached from the mounting portion 3a of the transfer base 3 and supported to the next hold 2a. The carriage 10 is caused to travel on the rail 4a by the wheels 11, and the upper transport unit 20 is connected to the nearest transport base 3 to perform the same loading operation.

  In the unloading, the natural gas hydrate A is transferred from the hold 2a to the land by an apparatus in which a horizontal transfer unit and a vertical transfer unit are appropriately combined in the same manner as the loading operation.

  Next, the configuration of the bulk cargo handling apparatus 1 will be described. The bulk cargo handling apparatus 1 includes an upper transport unit 20 and a lower transport unit 30, a vertical transport unit 40 connecting the upper transport unit 20 and the lower transport unit 30, and a vertical descending from the lower transport unit 30. The telescopic conveyance unit 50 is configured.

  The upper transport unit 20 is configured so that the connection unit 20a can be detachably and pivotably connected to the mounting unit 3a of the transport base 3 on the upper side on the land side, and the vertical transport unit 40 on the lower side of the sea side. It is configured to be connected to the lower transport unit 30 via The upper transport unit 20 is provided with a first transport device 21 formed by a horizontal belt conveyor or the like. The lower conveyance unit 30 is connected to the vertical conveyance unit 40 on the upper side of the land side, and is connected to the vertical telescopic conveyance unit 50 on the lower side of the sea side. The lower transport unit 30 is provided with a second transport device 31 formed by a horizontal belt conveyor or the like.

  As shown in FIGS. 1 and 2, the vertical telescopic conveyance unit (extensible unit) 50 includes a plurality (three in FIGS. 1 and 2) of cylindrical bodies 51, 52, and 53, and the plurality of these units. The cylindrical bodies 51, 52, 53 are partially overlapped and arranged continuously in the vertical direction. By changing the lengths L12 and L23 of the overlapping portions of the cylindrical bodies 51, 52 and 53, the vertical length Lt of the vertical telescopic transport unit 50 as the whole cylindrical body is changed. In this overlapping portion, the following airtight structure by liquid sealing is provided.

  Moreover, the upper end of this vertical expansion-contraction conveyance part 50 becomes the flange part 51b provided in the uppermost cylindrical body 51, and is connected to the lower conveyance part 30 shown in FIG. On the other hand, the lower end of the vertical telescopic conveyance unit 50 is a flange portion 53f provided in the lowermost cylindrical body 53, and this flange portion 53f is connected to the hold 2a side. Between the flange portion 53f and the hold 2a, there are provided a device for handling an emergency, a mechanism for connecting the flange portion 53f and the entrance of the hold 2a, and the like.

  First, the connection portion between the uppermost tubular body 51 and the intermediate tubular body 52, in other words, the airtightness and the expansion / contraction structure in the overlapping portion will be described. In this overlapping portion, the partition 51a on the lower end side of the uppermost cylindrical body 51 is inserted into a liquid reservoir 52b provided in the intermediate cylindrical body 52, and this liquid reservoir 52b is connected to the inner peripheral chamber 52ba and the outer periphery. Divide into side chambers 52bb. At the same time, the lower part of the inner peripheral side chamber 52ba and the outer peripheral side chamber 52bb are communicated so that the liquid B flows. With the liquid B put in the liquid reservoir 52b, the space between the upper part of the inner peripheral side chamber 52ba and the upper part of the outer peripheral side chamber 52bb is hermetically sealed. Further, by changing the insertion depth L12 of the partition 51a into the liquid reservoir 52b, the vertical length Lt of the vertical telescopic transport unit 50 as a whole of the cylindrical body is changed.

  The partition 51 a on the lower end side of the uppermost cylindrical body 51 also serves as the lower part of the wall surface 51 a of the cylindrical body 51. Further, the liquid reservoir 52b of the intermediate cylindrical body 52 is constituted by a double tube structure formed by an outer peripheral wall 52aa, an inner peripheral wall 52ab, and a bottom 52ac. And the partition part 51a of the lower end side of the uppermost cylindrical body 51 is inserted in the liquid reservoir part 52b comprised by the double pipe structure of this intermediate cylindrical body 52, and the liquid B is inserted into this liquid reservoir part 52b. Is put in, the gas can be sealed by the U-shaped tube effect of the liquid B formed in the liquid reservoir 52b.

  Next, the connection portion between the intermediate cylindrical body 52 and the lowermost cylindrical body 53, in other words, the airtightness and the expansion / contraction structure in the overlapping portion will be described. In this overlapping portion, the liquid reservoir 52b portion of the intermediate cylindrical body 52 is also used as the partition portion 52a, and the partition portion 52a also serving as the liquid reservoir portion of the intermediate cylindrical body 52 is used as the lowermost cylindrical body 53. The liquid reservoir 53c of the lowermost cylindrical body 53 is divided into an inner peripheral chamber 53ca and an outer peripheral chamber 53cb. At the same time, the lower part of the inner peripheral side chamber 53ca and the outer peripheral side chamber 53cb are communicated so that the liquid B flows. By the liquid B put in the liquid reservoir 53c of the lowermost cylindrical body 53, the space between the upper part of the inner peripheral side chamber 53ca and the upper part of the outer peripheral side chamber 53cb is hermetically sealed. Further, by changing the insertion depth L23 of the lowermost tubular body 53 of the partition 52a, which is also used as the liquid pool 52b of the intermediate tubular body 52, into the liquid pool 53c, the entire tubular body is changed. The vertical length Lt is changed.

  Further, a cover 51c that covers the inner peripheral chambers 52ba and 53ca so that the transported object A such as natural gas hydrate pellets passing through the cylindrical bodies 51, 52, and 53 does not enter the liquid reservoirs 52b and 53c. When 52e is provided, it is very easy to cause problems such as the transported object A such as natural gas hydrate pellets entering the liquid reservoirs 52b and 53c, and the transported object A being sandwiched between the parts carrying the airtight function. Can be prevented with a simple structure. The covers 51c and 52e may be formed of a plastic having a certain degree of flexibility, and are provided relatively long so as to cover the inlets of the inner peripheral chambers 52ba and 53ca even during extension.

  Further, at the time of extension, the maximum extension amount between the cylindrical bodies 51, 52, 53 with a chain or the like (not shown) so that the partition parts 51a, 52a do not come out of the liquid reservoirs 52b, 53c, in other words, The minimum amount of insertion depths L12 and L23 is limited to prevent the removal.

  The cylindrical bodies 51, 52, and 53 may be configured so that the upper partition parts 51a and 52a can be inserted into the liquid pool parts 52b and 53c of the lower cylindrical body. The cross-sectional shape is not limited to a circle but may be an ellipse, a polygon, or the like. 1 and 2 have been described with respect to the vertical telescopic conveyance unit 50 constituted by three cylindrical bodies, but it can be configured similarly in the case of two or three or more. In addition, as the number of cylindrical bodies increases and the partition portion is also used as the liquid reservoir, the width of the partition increases, so the partition formed by a partition plate or the like below the liquid reservoir By providing the portion, it is preferable that the width of the partition portion is narrowed and an overlapping portion is appropriately provided.

  According to this configuration, since it is liquid-sealed, even if the upper cylindrical body 51 (or 52) and the lower cylindrical body 52 (or 53) move up and down relatively, airtightness can be easily achieved. Since it can be maintained, airtightness can be constantly secured not only with a small opening but also with a large opening. Further, since the liquid seal portion is accommodated only in the outer peripheral side portion of the connection portion between the upper cylindrical body 51 (or 52) and the lower cylindrical body 52 (or 53), the structure can be simplified. Moreover, it can also be used as a structure for vertical expansion and contraction. Moreover, since the resistance for airtightness in the expansion / contraction portion due to the vertical movement is also the resistance due to the viscosity of the liquid, it can be made very small when the vertical speed of expansion / contraction is slow. Furthermore, by providing a clearance in the width direction of the overlapping portions L12 and L23, it is possible to reduce the fluctuation of the ship in the horizontal and longitudinal directions (roll) and movement (sway, yaw) due to waves. If it can be absorbed.

  As the liquid sealing liquid B to be put into the liquid reservoirs 52b and 53c, it is conceivable to use a liquid having a large specific gravity. However, when the liquid reservoirs 52b and 53c become low temperature due to cargo handling of natural gas hydrate or the like. Use antifreeze or circulate seawater or water. If seawater or water is used, it can be used easily, and even if the liquid B for liquid sealing leaks out, contamination of the sea area or water can be avoided, and the liquid B for liquid sealing is ensured. Therefore, the problem of environmental pollution and the problem of storage of liquid for sealing can be avoided.

  Further, the change in volume of the liquid reservoirs 52b and 53c due to the change in the insertion amounts L12 and L23 of the partition parts 51a and 52a into the liquid reservoirs 52b and 53c due to the expansion and contraction amount of the vertical expansion and contraction transport unit 50, and the liquid sealing In order to automatically compensate for the decrease due to evaporation or leakage of the liquid B, liquid replenishing tanks 52c and 53d are provided, and the liquid replenishing tanks 52c and 53d and the liquid reservoirs 52b and 53c are connected by pipes 52d and 53e, The liquid replenishing tanks 52c and 53d are configured to be able to supply the liquid sealing liquid B to the liquid reservoirs 52b and 53c.

  When the liquid B is supplied, the liquid replenishing tanks 52c and 53d are installed at an appropriate height to monitor the liquid level in the liquid reservoirs 52b and 53c, and the liquid in the liquid reservoirs 52b and 53c. While maintaining the liquid level at an appropriate level with an appropriate amount, an abnormal internal pressure is detected by detecting an abnormal rise or fall of the liquid level.

  When the pressure difference between the internal pressure and the external pressure (atmospheric pressure) is large, it is preferable to use a liquid with a large specific gravity. When the pressure fluctuation of the internal pressure is large, a liquid with a large viscosity is used to change the liquid level. Is preferably reduced. In addition, it is not desirable that the liquid used for liquid sealing evaporates or burns in the event of a fire. For example, liquids may be provided in multiple layers.

  Next, the connection parts 3a and 20a and the vertical conveyance part 40 which comprise the bulk cargo handling apparatus 1 are demonstrated a little in detail.

  As shown in FIGS. 5 and 6, the connection upper part (attachment part) 3 a of the transport base 3 and the connection lower part (connection part) 20 a of the upper transport part 20 are connected to the connection base 3 of the transport base 3. An upper flange portion 3ab is provided on the cylindrical body 3aa protruding to the lower surface side, and is fixed to the transport base 3. The cylindrical body 3aa is extended below the upper flange portion 3ab to provide a partition 3ad, and a cover 3ac is provided on the inner peripheral side of the cylindrical body 3aa. The cover 3ac is formed in a conical shape so that the lower side is narrow so as to cover the inner peripheral chambers 20be and 20ce so that the gas hydrate A passing through the connection upper part 3a does not enter the liquid reservoirs 20bd and 20cd described later. Or formed with a cloth-like cover. As a result, the gas hydrate A enters the liquid reservoirs 20bd and 20cd, and the occurrence of problems such as the gas hydrate A being sandwiched between the part responsible for the airtight function and the movable part when disconnected or connected has a very simple structure. Can be prevented.

  The connecting lower portion 20a is composed of an upper cylindrical body 20b, a lower cylindrical body 20c, and a hydraulic cylinder (actuator) 20d. The lower cylindrical body 20c and the hydraulic cylinder 20d are attached to the casing of the upper transport unit 20. It is fixed.

  The upper cylindrical body 20b is provided with a lower flange portion 20aa at its upper end and a liquid reservoir portion 20bd on its inner peripheral side. The lower flange portion 20aa is fixed to the upper end side of the hydraulic cylinder 20d and moves up and down by the expansion and contraction of the hydraulic cylinder 20d. The liquid reservoir 20bd is composed of a double wall structure composed of an outer peripheral wall 20ba and an inner peripheral wall 20bb and its bottom 20bc. In order to supply the liquid B for liquid sealing to the liquid reservoir 20bd, the liquid replenishing tank 20bg is connected to the liquid reservoir 20bd by a pipe 20bh. The liquid reservoir 20bd serves as a partition for the lower liquid reservoir 20cd.

  The lower cylindrical body 20c is configured to have a liquid pool portion 20cd composed of a double wall structure composed of an outer peripheral wall 20ca and an inner peripheral wall 20cb and a bottom portion 20cc thereof. The bottom portion 20cc is configured as a part of the casing of the upper transport unit 20 in the configuration of FIGS. In order to supply the liquid B for liquid sealing to the liquid reservoir 20cd, a liquid replenishment tank 20cg is connected to the liquid reservoir 20cd by a pipe 20ch.

  And the partition part 20bd used also by the liquid reservoir part 20bd of the upper cylindrical body 20b is inserted in the liquid reservoir part 20cd of the lower cylindrical body 20c. In other words, the plurality of cylindrical bodies 20b, 20c are partially overlapped and arranged continuously in the vertical direction. By changing the length Lbc of the overlapping portions of these cylindrical bodies 20b and 20c, in other words, the insertion depth Lbc, the overall length La of the cylindrical body is changed. The change in the length La in the vertical direction is performed by expansion and contraction of the hydraulic cylinder 20d.

  And the following airtight structure by liquid sealing is provided in the connection part of upper flange part 3ab and lower flange part 20aa, and the overlapping part of the two cylindrical bodies 20b and 20c.

  In this connection part, the partition part 3ad provided in the connection upper part 3a is inserted into the liquid reservoir part 20bd provided in the cylindrical body 20b above the connection lower part 20a, and this liquid reservoir part 20bd is connected to the inner peripheral side chamber 20be and the outer periphery. In addition to being divided into side chambers 20bf, the inner chamber 20be and the lower portion of the outer chamber 20bf are configured to communicate with each other so that the liquid B flows. Thereby, the space between the upper part of the inner peripheral side chamber 20be and the upper part of the outer peripheral side chamber 20bf is hermetically sealed by a liquid seal by the U-shaped tube effect of the liquid B put in the liquid reservoir 20bd.

  Moreover, in the overlapping part of the two cylindrical bodies 20b and 20c, the partition part 20bd which also serves as the liquid reservoir part 20bd of the upper cylindrical body 20b is inserted into the liquid reservoir part 20cd of the lower cylindrical body 20c, The liquid reservoir portion 20cd is divided into an inner peripheral chamber 20ce and an outer peripheral chamber 20cf, and the lower portion of the inner peripheral chamber 20ce and the outer peripheral chamber 20cf is configured to communicate with the liquid B, and is placed in the liquid reservoir 20cd. The liquid B seals the space between the upper part of the inner peripheral side chamber 20ce and the upper part of the outer peripheral side chamber 20cf by liquid sealing. With this configuration, even in the stretchable part formed by the two cylindrical bodies 20b and 20c, airtightness and stretchability can be easily secured, so that the connection upper part 3a and the connection lower part 20a can be easily disconnected and connected. it can.

  The overlapping of the cylindrical bodies can be similarly formed in three or more cylindrical bodies, but the upper cylindrical body partition portion does not come out of the lower liquid reservoir portion. In addition, a regulating member such as a chain is provided so as to regulate the maximum amount of overlap.

  In addition, when the number of cylindrical bodies increases and the partition portion is also used as the liquid reservoir, the width of the partition portion increases. Therefore, the liquid reservoir 20bd does not serve as the partition portion and the liquid reservoir By providing a partition portion formed of a partition plate or the like extending from the inner peripheral wall 20bb below the portion 20bd, the width of the partition portion can be reduced. In this case, since the liquid reservoir 20bd becomes shallow and the overlapping portion Lbc at the time of extension tends to be small, it is suitable when the difference between the internal pressure and the external pressure is small and the pressure fluctuation is small.

  Moreover, the shape of the connection upper part 3a and the connection lower part 20a should just be the structure which can insert the partition part 3ad of the connection upper part 3a in the liquid reservoir part 20bd of the connection lower part 20a, and the horizontal cross section of the partition part 3ad and the liquid reservoir part 20bd The shape is circular when mutual rotational movement is allowed. In addition, when it is not necessary to consider rotational movement, it is not limited to a circular shape, and may be an arbitrary shape such as an ellipse or a polygon. In addition, since the liquid B is used, the moving direction for disconnection and connection is preferably the vertical direction (vertical direction). However, by devising the shape of the liquid reservoir 20bd and the shape of the partition 3ad, the vertical direction Therefore, the present invention can also be applied to the case of extending or contracting in a direction inclined to some extent.

  As the liquid sealing liquid B to be put into the liquid reservoirs 20bd and 20cd, it is conceivable to use a liquid having a large specific gravity. However, when the liquid reservoirs 20bd and 20cd become low temperature due to the handling of natural gas hydrate, etc. Use antifreeze or circulate seawater or water. If seawater or water is used, it can be used easily, and even if the liquid B for liquid sealing leaks out, contamination of the sea area or water can be avoided, and the liquid B for liquid sealing is ensured. Therefore, the problem of environmental pollution and the problem of storage of liquid for sealing can be avoided.

  Furthermore, due to the change in volume of the liquid reservoirs 20bd and 20cd due to the insertion of the partition parts 3ad and 20bd into the liquid reservoirs 20bd and 20cd due to the expansion / contraction amount Lbc of the expansion / contraction part, and evaporation or leakage of the liquid B for liquid sealing In order to automatically compensate for the decrease, the liquid B for liquid sealing is supplied from the liquid replenishing tanks 20bg and 20cg to the liquid reservoirs 20bd and 20cd.

  When the liquid B is supplied, the liquid replenishing tanks 20bg and 20cg are installed at an appropriate height so that the liquid level in the liquid reservoirs 20bd and 20cd is monitored, and the liquid in the liquid reservoirs 20bd and 20cd is monitored. While maintaining the liquid level at an appropriate level with an appropriate amount, an abnormal internal pressure is detected by detecting an abnormal rise or fall of the liquid level.

  When the pressure difference between the internal pressure and the external pressure (atmospheric pressure) is large, it is preferable to use a liquid with a large specific gravity. When the pressure fluctuation of the internal pressure is large, a liquid with a large viscosity is used to change the liquid level. Is preferably reduced. In addition, it is not desirable that the liquid used for liquid sealing evaporates or burns in the event of a fire. For example, liquids may be provided in multiple layers.

  Further, in the connected state, the connection lower portion 20a, that is, the entire portion ahead of the upper transfer portion 20 can be turned with respect to the connection upper portion 3a of the transfer base 3. For example, as shown in FIG. 3, an arc-shaped rail 12 centering on the axis 22 of the connection upper portion 3 a and the connection lower portion 20 a is laid on the upper surface of the support carriage 10, and the upper surface of the rail 12 is upper. The conveyance unit 20 is turned or swung by running. As the turning power, a hydraulic motor or the like can be used when driving the wheel 23, and a hydraulic cylinder or the like connecting the support carriage 10 side and the upper transport unit 20 can be used when swinging. .

  The separation (separation) and connection in the connection portions 3a and 20a will be described. In the connected state as shown in FIG. 5, the partition portion 3ad is inserted into the liquid reservoir portion 20bd, and the partition portion 20bd that is also used as the liquid reservoir portion 20bd is inserted into the liquid reservoir portion 20cd, so that airtightness is maintained by liquid sealing at two locations. Has been done.

  In order to shift from the state of FIG. 5 to the state of FIG. 6, the airtight door (not shown) is closed on the transport base 3 side and the upper transport unit 20 side, and the transport base 3 side and the upper transport unit 20 side are closed. After maintaining the airtightness and preventing the combustible gas from flowing out from the transport base 3 side to the connection upper part 3a and from the upper transport part 20 side to the connection lower part 20a, the combustible gas inside the connection sandwiched between the airtight doors is removed. Replace with inert gas. Thereafter, the connection upper part 3a and the connection lower part 20a are brought into a state where they may be opened to the atmosphere.

  In this state, if necessary, after fixing between the connection upper part 3a and the connection lower part 20a, for example, fastening between the upper flange part 3ab and the lower flange part 20aa, is released, the hydraulic cylinder 20d. The lower flange portion 20aa is pulled down and separated from the upper flange portion 3ab. By lowering the lower flange portion 20aa, the partition portion 3ad is extracted from the liquid pool portion 20bd, while the partition portion 20bd also serving as the liquid pool portion 20bd (or the partition plate 20bba below the liquid pool portion 20bd). The depth Lbc inserted into the liquid reservoir 20cd increases. When the partition part 3ad is completely extracted from the liquid B of the liquid reservoir part 20bd, the airtightness between the inside and the outside is released, the connection upper part 3a and the connection lower part 20a are separated, and the atmosphere is opened. Further, when the lower flange portion 20aa is lowered and the lower flange portion 20aa and the inner peripheral wall 20bb are lower than the lower end of the partition portion 3ad, the lower flange portion 20aa is stopped from being lowered.

  In this state, the upper conveyance unit 20 of the bulk cargo handling apparatus 1 is separated from the conveyance base 3. And the vertical expansion-contraction conveyance part 50 and the hold 2a are cut off, hold | maintaining airtight as needed also for the hold 2a hold side. In this separated state, the bulk cargo handling device 1 can travel on the rail 4a of the land 4 with the support carriage 10 and move, so in this state, the cargo hold 2a that is the next cargo handling target or the carrier Move to base 3. And the connection lower part 20a of the upper conveyance part 20 is moved to the position which opposes the connection upper part 3a of the conveyance base 3 for cargo handling.

  When the connection lower part 20a can be turned with respect to the connection upper part 3a, a part or all of the upper flange part 3ab or part or all of the lower flange 20aa has a double flange structure, and a bearing is interposed between them. By arranging one or the like, one of the double flange structures can be turned with respect to the other, whereby a structure that can be turned easily can be formed. Next, in order to shift from the state of FIG. 6 to the state of FIG. 5, the hydraulic cylinder 20d is extended and the lower flange portion 20aa is pulled up while maintaining the airtightness on the side of the transport base 3. By raising the lower flange portion 20aa, the partition portion 3ad is inserted into the liquid reservoir portion 20bd, while the partition portion 20bd (or the partition plate 20bba) also serving as the liquid reservoir portion 20bd is inserted into the liquid reservoir portion 20cd. Depth Lbc decreases. When the partition 3ad is inserted into the liquid B of the liquid reservoir 20bd, the inside and the outside are kept airtight. Further, when the lower flange portion 20aa is lifted and the lower flange portion 20aa is brought into contact with the upper flange portion 3ab, the lower flange portion 20aa is stopped to be lifted. If necessary, an operation of fixing the connection upper portion 3a and the connection lower portion 20a, for example, a fastening operation of the lower flange portion 20aa and the upper flange portion 3ab is performed. Even if this fixing work is not performed, the partition part 3ad is inserted into the liquid B of the liquid reservoir part 20bd to maintain airtightness. If possible, carry out cargo handling work without fixing.

  In this state, the upper conveyance unit 20 of the bulk cargo handling apparatus 1 is connected to the conveyance base 3 while maintaining an airtight state. And the vertical expansion-contraction conveyance part 50 is connected to the cargo hold 2a side of cargo handling object, and airtightness is maintained also in this part. After replacing the air inside the connection part sandwiched between the airtight doors on the transport base 3 side and the upper transport part 20 side with an inert gas, the airtight doors on the transport base 3 side and the upper transport path 20 side are opened, Further, if necessary, by opening an airtight door between the hold 2a and the upper transport unit 20, the transport base 3, the connection upper part 3a, the connection lower part 20a, the upper transport part 20, the vertical transport part 40, the lower transport The part 30, the vertical telescopic conveying part 50, and the hold 2a communicate with each other while maintaining an airtight state.

  As shown in FIGS. 7 and 8, the vertical transport unit 40 includes a swivel upper portion 41 and a swivel lower portion 42, and a swivel portion 5 that is pivotally connected to the swivel lower portion 42 below the swivel upper portion 41. An airtight structure by liquid sealing is provided. The airtight structure by the liquid seal is also the same as the vertical telescopic conveyance unit 50, the turning upper part 41 is formed with a cylindrical wall 41a, the flange part 41b is provided in the middle part, and the lower end thereof On the side, a partition portion 41c formed of a cylinder or the like is provided. On the other hand, the swivel lower part 42 is configured to have a liquid reservoir part 42d formed by a cylindrical outer peripheral wall 42a, an inner peripheral wall 42b, and a bottom part 42c between the double walls. Further, in order to prevent the bulk cargo A from entering the inner circumferential side chamber 42e of the swivel lower portion 42 described below, a cover 41d formed in a conical shape or the like having a narrower lower side at an appropriate position inside the cylindrical wall 41a. A cloth-like cover or the like is provided.

  Further, a partition 41c is inserted into the liquid reservoir 42d to divide it into an inner peripheral side chamber 42e and an outer peripheral side chamber 42f. At the same time, the lower part of the inner peripheral side chamber 42e and the outer peripheral side chamber 42f are communicated so that the liquid B flows. Then, the liquid B put in the liquid reservoir 42d seals the space between the upper part of the inner peripheral side chamber 42e and the upper part of the outer peripheral side chamber 42f by liquid sealing by the U-shaped tube effect of the liquid B.

  Further, in order to automatically compensate for the decrease due to evaporation or leakage of the liquid sealing liquid B, the liquid sealing liquid B can be supplied to the liquid reservoir 42d by the liquid replenishing tank 42h and the pipe 42i. The supply of the liquid B and the liquid B, the monitoring of the liquid level in the liquid reservoir 42d, and the like are substantially the same as those of the vertical telescopic conveyance unit 50.

  Since the airtight structure of the swivel unit 5 provides a liquid-tight airtight structure, even if the swivel upper part 41 and the swivel lower part 42 swivel relatively, the airtightness can be easily maintained, and only a small opening part can be maintained. In addition, even with a large opening, airtightness can be constantly secured.

  Further, by putting an inert gas (inert gas) C such as nitrogen gas into the space above the liquid level of the outer peripheral side chamber 42f, even if flammable gas leaks, this space portion or this space Since it can prevent that the vicinity part connected to becomes an explosive atmosphere, safety | security can be increased more.

  Note that the bottom portion 42c between the double walls only needs to be secured by the liquid reservoir portion 42d to have a depth sufficient to maintain airtightness, and is not necessarily limited to the case (housing) of the lower conveyance portion 30 as shown in the drawing. Need not be at the same level.

  Further, as a mechanism of the turning unit 5 for turning, for example, a bearing 43 is disposed between the upper flange portion 41b of the turning upper portion 41 and the lower flange portion 42g of the turning lower portion 42, and a motor and a gear (not shown) are arranged. By this mechanism, a turning force is applied to the turning lower portion 42. In addition, the weight of the lower conveyance part 30 can be supported with the support trolley | bogie 10 by the structure which is not shown in figure, or it can be suspended from the upper conveyance part 20, and can be supported. This support can be easily performed by a known technique. With this configuration, with the turning surface 43a shown in FIGS. 7 and 8 as a boundary, the portion below the arrow, that is, the portion below the lower flange portion 42b is connected to the upper flange portion 41b above the turning surface 43a by the arrow. As shown, it is relatively rotatable.

  Since the bulk cargo handling apparatus 1 is configured to include the airtight and telescopic structure of the vertical telescopic conveyance unit (expandable part) 50, the airtightness of the vertical telescopic conveyance part 50 of the bulk cargo handling apparatus 1 is configured. Property and elasticity. Therefore, even if flammable gas or the like is generated, it does not leak to the outside of the bulk cargo handling apparatus, and conversely, outside air does not enter the bulk cargo handling apparatus. Therefore, when carrying bulk cargo A that generates combustible gas such as natural gas hydrate, it can be safely transported while being shut off from the outside air.

  Further, the above airtight holding and expansion / contraction method of the vertical telescopic transport unit 50 is the same as that of the upper cylindrical body 51 (or 52) in the vertical telescopic transport unit 50 formed with a plurality of cylindrical bodies 51, 52, 53. ) Is inserted into a liquid reservoir 52b (or 53c) provided in the lower cylindrical body 52 (or 53), and the liquid reservoir 52b (or 53c) is inserted. While dividing into the inner peripheral side chamber 52ba (or 53ca) and the outer peripheral side chamber 52bb (or 53cb), the liquid B is circulated in the lower part of the inner peripheral side chamber 52ba (or 53ca) and the outer peripheral side chamber 52bb (or 53cb), and the liquid reservoir 52b (Or 53c) is liquid-sealed between the upper part of the inner peripheral side chamber 52ba (or 53ca) and the upper part of the outer peripheral side chamber 52bb (or 53cb) by the liquid put in (or 53c), and the partition part By changing the insertion depth L12 (or L23) of the liquid reservoir portion 52b (or 53c) of 1a (or 52a), the vertical length Lt as the vertical telescopic conveyance portion 50 which is the entire cylindrical body Therefore, even if the upper cylindrical body 51 (or 52) and the lower cylindrical body 52 (or 53) move up and down relatively, it is easily airtight. The airtightness and the stretchability can be constantly secured even with a large opening.

It is a sectional side view which shows typically the state where the airtightness of the expansion-contraction part of embodiment which concerns on this invention, and the expansion-contraction structure were shortened. It is a sectional side view which shows typically the airtight of the expansion-contraction part of FIG. 1, and the state which the expansion-contraction structure extended. It is sectional drawing which shows typically the structure of the bulk loading cargo handling apparatus. It is a top view which shows typically the structure of a bulk loading cargo handling apparatus. It is a sectional side view which shows typically the state where the airtightness of the connection part and the expansion-contraction structure were shortened. FIG. 6 is a side sectional view schematically showing an airtight state of the connecting portion in FIG. 5 and an extended state of the stretchable structure. It is a sectional side view which shows typically the structure of the vertical conveyance part which has a turning part of an airtight structure. It is a sectional side view which shows typically the structure of the turning part of FIG.

Explanation of symbols

1 Bulk carrier 2 Bulk carrier 3a Connection upper part (connection part)
5 Turning part 20 Upper transport part 20a Connection lower part (connection part)
30 Lower conveying part 40 Vertical conveying part 50 Vertical telescopic conveying part (expandable part)
51 Uppermost cylindrical body 51a Partition part (wall surface of cylindrical body)
51c cover 52 intermediate cylindrical body 52a liquid reservoir 52aa outer peripheral wall 52ab inner peripheral wall 52ac bottom 52b liquid reservoir (partition part)
52ba inner peripheral side chamber 52bb outer peripheral side chamber 52c liquid replenishment tank 52d piping 52e cover 53 lowermost cylindrical body 53a outer peripheral wall 53b inner peripheral wall 53c liquid reservoir 53ca inner peripheral side chamber 53cb outer peripheral side chamber 53d liquid replenishing tank 53e piping 53f flange portion Cargo B Liquid L12, L13 Overlapping part length (insertion depth)
Lt Length in the vertical direction WL Water surface (sea surface)

Claims (5)

A plurality of cylindrical bodies are partially overlapped and arranged continuously in the vertical direction, and by changing the length of the overlapping portion between these cylindrical bodies, the cylindrical body as a whole in the vertical direction In the stretchable part that changes the length, an airtight structure by liquid sealing is provided in the overlapping part, and three or more cylindrical bodies are provided, and the upper partition part is also used as a liquid reservoir part. A partition portion also serving as a liquid reservoir portion is inserted into the liquid reservoir portion of the lower cylindrical body, and the liquid reservoir portion of the lower cylindrical body is divided into an inner peripheral side chamber and an outer peripheral side chamber, and the inner peripheral side chamber and The lower part of the outer peripheral side chamber is configured to communicate with the liquid so that a liquid seal is provided between the upper part of the inner peripheral side chamber and the upper part of the outer peripheral side chamber by the liquid placed in the liquid reservoir of the lower cylindrical body. Airtight and also serves as a liquid reservoir for the upper cylindrical body. By changing the insertion depth of the liquid pool portion of the lower cylindrical body of the Ri portion, airtight and the stretch of the stretch section, characterized in that to change the vertical length of the entire tubular body Construction. 2. The airtightness and expansion and contraction of the expansion / contraction part according to claim 1, wherein a cover that covers the inner peripheral side chamber is provided in the liquid reservoir part so that an object to be conveyed that passes through the inside of the cylindrical body does not enter. Construction. 3. The airtight and stretchable structure of the stretchable portion according to claim 1 or 2, wherein a liquid sealing liquid put in the liquid reservoir portion is circulated. A bulk cargo handling apparatus comprising the airtight and elastic structure of the elastic part according to claim 1, 2 or 3. In the airtight and elastic structure of the expansion / contraction part provided with three or more cylindrical bodies, the upper partition part is also used as the liquid reservoir part, and the partition part that also serves as the liquid reservoir part of the upper cylindrical body is used as the lower cylinder. And inserted into the liquid reservoir portion of the cylindrical body to divide the liquid reservoir portion of the lower cylindrical body into an inner peripheral side chamber and an outer peripheral side chamber and communicate with each other so that liquid flows in the lower portion of the inner peripheral side chamber and the outer peripheral side chamber. In addition, the liquid placed in the liquid reservoir portion of the lower cylindrical body seals the space between the upper portion of the inner peripheral chamber and the upper portion of the outer peripheral chamber by liquid sealing, and the liquid reservoir portion of the upper cylindrical member. The vertical length of the entire cylindrical body is changed by changing the insertion depth of the partition part also serving as a liquid reservoir in the lower cylindrical body. The airtight holding and expansion / contraction method of the expansion / contraction part.

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