JPH0372848B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rotating dart pot for effectively attenuating loads associated with large displacement movements, such as slack or tension in mooring cables of floating bodies. .

(Prior art) Dashpots are a shock absorbing device that utilizes the throttling effect of fluid to prevent sudden loads from being applied.Generally, a dart pot is a closed cylinder filled with fluid.
It is constructed by inserting a piston with an orifice formed therein.

However, such a straight-line dart pot has a limited stroke, so if it is used as a mooring device for a floating body that is expected to undergo various movements and large displacements due to waves, for example, the following It has the following problems.

That is, first, as shown in FIGS. 5 and 6, the mooring device connects one end of the mooring cable 2 to the floating body 1, while the other end is connected to the piston 6 of the dart pot 4 via the guide roller 3. It is connected to one side, so that when the floating body 1 leaves the shore, the fluid inside the cylinder 5 is subjected to the throttling action of the orifice 6a of the piston 6 to exert a damping effect. The return of the piston 6 is performed by a spring 7 disposed at the rear inside the cylinder.

Therefore, when this type of device is installed on the apron of the quay 8 as shown in FIG.
a and an opening/closing lid 8b, and when it is installed on the quay surface 8c as shown in FIG. It is troublesome and costly, and since there is a limit to the stroke, if a large displacement is expected due to natural conditions such as waves and wind pressure, such as floating body 1, it is necessary to use a dart pot with a long stroke, i.e. A large dart pot must be used, and since the mooring line 2 passes inside the cylinder 5, there is a problem that internal fluid leaks from the sliding part between the mooring line 2 and the cylinder 5. There are restrictions such that the cross section of the dowel must be circular, and furthermore, it is desirable that the damping coefficient of the dart pot 4 that moored the floating body 1 should be adjusted depending on the weight of the target floating body, etc. But the seventh
When the adjustment device 9 is installed as shown in the figure, the device main body d becomes a two-cylinder type, which not only increases the size but also
There are problems such as difficulty in maintenance and management due to seawater etc.

(Means for Solving the Problems) The present invention has been made to solve the above-mentioned conventional problems, and is small in size while effectively attenuating large displacement movements on the load side. ,
To provide a rotary doss pot that is not only easy to install and inexpensive, but also usable without imposing any restrictions on various devices.

In order to achieve the above object, the present invention has one end connected to a load side, the other end of which is wound around a rotating member for winding, and other ends of the linear member wound around this rotating member. A counterweight is attached to the end, and in response to movement displacement on the load side in a direction that causes slack in the wire member, the rotating member is rotated to wind up the wire member and pull the wire member. In response to the movement displacement on the load side in the tensioning direction, the rotating member is allowed to reverse and the linear member is pulled out, thereby applying a constant tension to the linear member at all times. The hydraulic pump is actuated by the rotational force of the rotating member accompanying the withdrawal, and this hydraulic pump is provided with a passage member for circulating internal fluid, and within this passage member, a portion of several tens of cm or more on the load side is provided. It is characterized by the formation of an orifice that attenuates the kinetic energy of large displacement movements of several tens of meters.

(Example) Hereinafter, the principle of the present invention will be explained in detail based on the example shown in FIGS. 1 and 2.

FIG. 1 is a configuration diagram of a rotary dart pot according to the present invention, and FIG. 2 is a hydraulic pump 15 in FIG. 1.
It shows a cross-sectional view of the cylinder part, which is the main part of the
In the figure, reference numeral 10 is a wire connected to the floating body as a load side, 11 is a wire on the dart pot side, 12 is a winding wheel, 13 is a rotating shaft of the winding wheel,
14 is a hydraulic pump having a cylinder portion 15.

In FIG. 1, the tips of the wire 10 on the load side and the wire 11 on the dart pot side are connected to the hook 1.
6, and a stopper 17 is installed on the wire 11 on the dashpot side at a position retracted by the length from the load side.

The rear end of the dart pot side wire 11 is
After being wound several times around the winding wheel 12, it is connected to the counterweight 18. This counterweight 18 rotates the winding wheel 12 and winds the wire 11 when the load side is displaced in a direction that causes slack in the wire 10 between the winding wheel 12 and the load. When the load side undergoes a movement displacement in the pulling direction, it functions as a winding force generator for the winding wheel that constantly applies constant tension to the wire 10 by allowing the winding wheel 12 to rotate in reverse and pulling out the wire 10. do. The weight of the counterweight 18 is appropriately selected depending on the weight of the load side.

The hydraulic pump 14 that is operated by the rotation of the wheel 12 described above is appropriately selected from a screw pump, a gear pump, a vane pump, etc., and the fluid filled inside is pumped into the cylinder part 15 during pump operation.
It is configured to circulate through the

As shown in FIG. 2, the cylinder portion 15 includes a main flow path 15a and a sub flow path 15 that branches from the middle of the main flow path 15a and joins the main flow path 15a again.
b, and an orifice 19 is provided in the middle of the main channel 15a to produce a fluid throttling effect, while a one-way valve that restricts the fluid to flow in only one direction is provided in the middle of the sub channel 15b. 20 is installed. Specifically, this one-way valve 20 is opened when the hydraulic pump 14 is activated by forward rotation of the winding wheel 12 in the winding direction (clockwise in the figure), and when the winding wheel 12 is reversed (clockwise in the figure). It is configured so that it can be closed when it is turned (in the middle counterclockwise direction).

Therefore, in FIG. 1, due to the acting force A, the wire 1
0 and 11 are pulled toward the load side, the winding wheel 12 rotates counterclockwise in the figure, and the hydraulic pump 1
Activate 4. The internal fluid is pumped into the cylinder part 15 by the action of the hydraulic pump 14 (arrow a in FIG. 2), but since the one-way valve 20 of the sub-flow path 15b is closed, this fluid flows through the main flow path 15a. The water is then refluxed to the pump 14. In the middle of this flow path 15a, the fluid flows through the orifice 1.
9, thereby performing the function as a dart pot.

Further, when the acting force from the load side acts in the direction B opposite to the above, the winding wheel 12 rotates clockwise in the figure due to the action of the counterweight 18, and the fluid in the cylinder 15 is pumped through the hydraulic pump 14. Make it flow backwards (arrow b in Figure 2). As a result, the fluid flows through valve 2
0 quickly flows through the open sub-flow path 15b and follows the acting force B described above.

Of course, if a damping force is to be applied to this acting force B, the sub flow path 15b may be omitted.

Further, in order to adjust the damping coefficient according to the acting force, the orifice of the fluid passage portion may be configured to be variable.

3 and 4 are explanatory diagrams schematically showing the case where the rotary dosspot D according to the present invention is applied to a mooring device for a floating body. In FIG. 3, a recess 21 is provided on the apron of the quay, A dart pot D according to the present invention is installed in this recess 21. Note that in this figure, the counterweight is omitted. In addition, in FIG.
The counterweight 18 is connected to the end of the mooring line 23 wound around the wheel and suspended into the sea, but the specific installation means are selected depending on the purpose of use. be done.

According to this embodiment, it is possible to provide a small and inexpensive mooring device with an unlimited stroke for moored objects that are expected to undergo large displacements, and to prevent loosening and tension of the mooring ropes due to changes in the water of the floating body. can be absorbed effectively. In addition, compared to the straight type, installation work is not only easier, but
No fluid leaks from the contact area between the mooring cable and the cylinder. Moreover, since it is not restricted by the cross-sectional shape of the mooring element, various mooring ropes can be used.

(Effects of the Invention) As described above, according to the present invention, the linear member to which the acting force on the load side is transmitted is wound around the rotating member, and the counterweight attached to this linear member allows By winding and pulling out the linear member in response to the acting force on the load side, constant tension is applied to the linear member, and by the rotational force of the rotating member accompanying the winding and drawing of the linear member, The internal fluid in the hydraulic pump is passed through a passage member having an orifice so that the damping force against the above-mentioned acting force acts immediately following the movement of the load.
It is possible to provide a dart pot that has an effective damping effect against large displacements on the load side, such as loosening and tensioning of mooring cables of floating bodies due to changes in water intake.

In addition, since a counterweight is used as a means of generating winding force for the rotating member, it is possible to generate an appropriate winding force even for floating bodies of various weights by the relatively simple task of adding or subtracting weights. This allows the above-mentioned attenuation to be performed even more effectively.

Furthermore, according to the present invention, the main body of the device can be made more compact than the conventional linear type, and the manufacturing and installation costs are not only low, but also when used as various shock absorbers. The system has various excellent effects such as easy installation work and therefore easy maintenance and management.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a rotating dart pot according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing the cylinder part of FIG. 1, and FIGS. Figures 5 and 6 are explanatory diagrams showing an example of the installation of a conventional linear dart pot, and Figure 7 is a conventional linear dart pot incorporating a damping coefficient adjustment device. FIG. In the figure, 10 is a mooring cable on the floating body side, 11 is a mooring cable on the dart pot side, 12 is a winding wheel, 13 is a shaft,
14 is a hydraulic pump, 15 is a cylinder section, 15a is a main flow path, 15b is a sub flow path, 16 is a hook, 17 is a stopper mechanism, 18 is a counterweight, 19 is an orifice, and 20 is a one-way valve.

Claims (1)

[Claims] 1. One end of a linear member is connected to the load side, and the other end of the linear member is wound around a rotational member for winding, and a counterweight is attached to the other end of the linear member that is wound around the rotational member. is installed, and in response to movement displacement on the load side in a direction that causes slack in the wire member, the rotary member is rotated to wind up the wire member, and the wire member is pulled in the direction of tension. In response to the movement displacement on the load side, by allowing the rotating member to reverse and pulling out the wire member, a constant tension is always applied to the wire member. The hydraulic pump is actuated by the rotational force of the rotating member, and this hydraulic pump is provided with a passage member for circulating internal fluid. A rotary doss pot characterized by an orifice that damps the kinetic energy of large displacement movements. 2. Separately from the main passage part in which the orifice is formed in the passage member, a bypass passage part is provided with a one-way valve that is opened when a backflow of fluid occurs in the cylinder part due to reverse rotation of the rotation member. A rotary doss pot according to claim 1, comprising: