JP7265779B2 - Lifting equipment test system - Google Patents

Description

The present invention relates to a test system for a lifting device having a lifting winch used for lifting and lowering objects.

A large ship (mother ship) may be equipped with a small ship (loading boat) such as a work boat. In addition, it is practical to provide such a mother ship with a hoisting device for hoisting and lowering the boat (see, for example, Patent Document 1). The hoisting device described in Patent Literature 1 has a boom and a hoisting winch for suspending a watercraft.

JP-A-2005-112622

There is a need for a test system for verifying the performance of the lifting winch of the lifting device in lifting and lowering the boat. It should be noted that the actual situation concerning such a test system for a lifting device is generally common to a lifting device having a lifting winch for lifting and lowering some kind of object.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lifting apparatus testing system capable of confirming the performance of lifting an object by a lifting winch.

A lifting device test system for solving the above problems is applied to a lifting device provided with a lifting winch that operates in a state in which an object is engaged with a first sling to lift and lower the same object. , a test system for testing the lifting winch, wherein one of a weight corresponding to the weight of the object and the object is suspended from one end of a second sling, and an electric motor as a power source is operated. and a control unit for controlling the operation of the electric motor in such a manner that the load applied to the first sling cable fluctuates in a predetermined test pattern.

According to the above configuration, a load that fluctuates in a predetermined test pattern can be applied to the first sling cable of the lifting winch through the operation control of the test winch (specifically, the electric motor that is the power source). As a result, the situation in which the load that fluctuates in the above test pattern is applied to the first sling cable of the lifting winch can be simulated with high accuracy. can do.

In the above test system, the lifting winch lifts and lowers the mounted boat as the object, and the test system includes a weight corresponding to the mounted boat and a weight of the weight that is equal to the weight of the first a connecting portion that connects the first sling cable and the weight in a manner that acts in a direction to pull the 1 sling cable downward, and the control section determines in advance the winding and unwinding of the second sling cable. It controls the operation of the motor in an alternating cycle and speed manner.

According to the above configuration, by connecting the weight to the first sling cable of the lifting winch, it is possible to simulate a situation in which the boat is suspended from the first sling cable. Moreover, by controlling the operation of the test winch and moving the weight up and down at a predetermined cycle and speed, the boat suspended from the first hoisting rope of the lifting winch moves up and down following the fluctuations of the wave surface. It is possible to simulate the situation with high accuracy. Therefore, it is possible to properly check the performance of the hoisting winch in the situation of hoisting and lowering the mounted boat on the sea surface.

In the above test system, the hoisting device has a hoisting force of the hoisting winch in accordance with the vertical movement of the hoisting boat according to the fluctuation of the water surface so that the first sling cable does not loosen when the hoisting boat is hoisted down. has a function to automatically adjust

According to the above configuration, when the weight is moved up and down at a predetermined cycle and speed through the operation control of the test winch, the tension state of the first sling cable can be visually confirmed and the tension of the first sling cable can be measured. By doing so, it is possible to confirm that the first sling cable does not become loose when the boat is being lifted and lowered from the surface of the sea.

In the above test system, it is preferable that the control unit causes the second sling cable to be wound up and unwound in such a manner that the weight moves up and down following variations in the wavefront of a standard wave.

According to the above configuration, it is possible to simulate a situation close to the situation in which the boat is actually hoisted and lowered through the operation control of the test winch. can be confirmed.

In the above test system, the lifting device has an arm section to which the first sling is hung, and suspends the object from a tip portion of the arm section, and the test system includes the arm section a first pulley provided below the tip portion of the pulley and a second pulley provided above one of the pulleys, and the first pulley and the second pulley form an N-shaped first sling cable It is preferably hangable.

According to the above configuration, an object or a weight corresponding to the object can be suspended at a position away from the lifting device. Therefore, objects or weights can be separately suspended from the first sling of the lifting winch and the second sling of the test winch without interfering with each other.

In the above test system, it is preferable to have a tension detector that detects the tension of the first sling.
According to the above configuration, the tension applied to the first sling cable of the hoisting winch when the object is lifted and lowered by the hoisting device is a predetermined amount, compared to the case of visually confirming the state of the first sling cable of the hoisting winch. It is possible to determine with high accuracy that it falls within the allowable range of .

According to the present invention, it is possible to check the performance of lifting and lowering an object by a lifting winch.

FIG. 2 is a side view showing a retracted state of a lifting device to which the test system of one embodiment is applied; The side view which shows the deployment state of the lifting-lowering apparatus. (a) and (b) are side views showing the watercraft suspended from the hoisting device and its surroundings. Side view of the test system. A block diagram showing the structure of the test winch and control panel. A time chart conceptually showing an example of a test pattern. The schematic diagram which shows schematic structure of the test system of the lifting-and-lowering apparatus of other embodiment.

An embodiment of a lifting device testing system will be described below.
First, a watercraft lifting device to which the test system of this embodiment is applied will be described.
As shown in FIGS. 1 and 2, the boat hoisting device 10 is installed on the deck of a mother ship 11, which is a large ship. This mounted boat hoisting device 10 operates in a state in which a small-sized boat (mounted boat 12) mounted on a mother ship 11 is suspended to lift and lower the mounted boat 12 from the mother ship 11. - 特許庁

The boat hoisting device 10 has a base portion 13 that is fixed to the mother ship 11 and a boom 14 that is an arm from which the boat 12 is suspended. The boom 14 is L-shaped. One end of the boom 14 is rotatably connected to the base portion 13 . A hydraulic cylinder 15 is attached to the boom 14 . The boat lifting device 10 has a hydraulic circuit (not shown) from which hydraulic pressure is supplied to the hydraulic cylinder 15 .

When the hydraulic cylinder 15 is shortened by supplying hydraulic pressure to the hydraulic cylinder 15, the boom 14 is rotated toward the mother ship 11 (the position shown in FIG. 1). As a result, the boom 14 is in a stowed state suitable for storing the boat 12 on the mother ship 11 . On the other hand, when the hydraulic cylinder 15 is extended, the boom 14 is rotated outward from the mother ship 11 (the position shown in FIG. 2). This places the boom 14 in a deployed state suitable for lowering the loaded craft 12 to the surface of the water.

A lifting winch 16 for lifting and lowering the boat 12 is attached to the boom 14 . The lifting winch 16 has a wire 17 as a first sling, a drum around which the wire 17 is wound, and a hydraulic motor for rotating the drum. One end of the wire 17 is fixed to the drum, and the other end of the wire 17 is provided with a link (not shown) for locking the boat 12 . A wire 17 is hung on the boom 14 . In the watercraft hoisting device 10 , the watercraft 12 is suspended from the tip of the boom 14 via the wire 17 .

When the hydraulic motor is driven to rotate the drum of the lifting winch 16 in one direction while the boat 12 is engaged with the wire 17, the wire 17 is wound around the drum and the boat 12 is lifted. will come to On the other hand, when the hydraulic motor is driven to rotate the drum of the lifting winch 16 in the other direction while the boat 12 is engaged with the wire 17, the wire 17 is let out from the drum and the boat 12 descends. become.

When the boat 12 is lifted and lowered, the boat hoisting device 10 automatically increases the hoisting force of the hoisting winch 16 according to the vertical movement of the boat 12 according to the fluctuation of the water surface so that the wire 17 does not loosen. It has an adjustment function (auto tension function).

Specifically, the hydraulic circuit that supplies hydraulic pressure to the hydraulic motor of the lifting winch 16 relieves the hydraulic pressure on the suction port side of the hydraulic motor to the discharge port side when the hydraulic motor is rotating in the hoisting direction. It has a relief circuit. The watercraft hoisting device 10 also has a selector switch for switching between a state in which the relief circuit functions and a state in which the relief circuit does not function. When the changeover switch is turned on to activate the auto-tension function, the lifting winch 16 operates as follows.

As shown in FIG. 3, when the watercraft 12 floats on the water surface W, the watercraft 12 moves up and down according to the fluctuation of the wave front.
As shown in FIG. 3(a), during the period when the wave surface in contact with the boat 12 rises, the boat 12 also rises according to the wave front. 2) winds up the wire 17 . In the watercraft hoisting device 10, the hoisting force of the hoisting winch 16 (specifically, the torque of the hydraulic motor) is determined so that the wire 17 does not loosen when the wire 17 is hoisted.

On the other hand, as shown in FIG. 3( b ), during the period when the wave surface with which the boat 12 is in contact descends, the boat 12 also descends according to the wave front. It acts on the wire 17 so as to pull out the same wire 17 . At this time, the relief circuit functions, and the hydraulic motor reversely rotates against the torque of the hydraulic motor in the hoisting direction. will come to In the boat hoisting device 10, the hoisting force of the hoisting winch 16 (specifically, the torque of the hydraulic motor, the relief force, etc.) is adjusted so that the boat 12 is properly prevented from separating from the wave surface when the wire 17 is let out. relief pressure in the circuit, etc.) are defined.

In addition, in the mounted boat hoisting device 10, during the period during which the loaded boat 12 is lowered to lower the loaded boat 12 to the water surface W and during the period during which the loaded boat 12 is lifted to the mother ship 11, the above-described The changeover switch is turned off to disable the auto-tension function.

A test system for confirming the performance of such a watercraft lifting device 10 will be described below.
As shown in FIG. 4, the test system 20 has a base 22 on which the watercraft hoisting device 10 to be tested is installed.

The test system 20 also has a weight connecting portion 24 to which a weight 23 is attached. As the weight 23, a weight corresponding to the loaded boat 12 (for example, 500 to 1500 kg) is attached. The test system 20 has a plurality of weights 23 with different weights. The weight connecting portion 24 has a structure to which one of the plurality of weights 23 can be selectively attached.

A first upper pulley 25 as a second pulley is arranged above the weight 23 . In this embodiment, the first upper pulley 25 is attached to the portal crane 28 . A first lower pulley 26 as a first pulley is arranged below the tip portion of the boom 14 of the boat hoisting device 10 installed on the base 22 .

In the test system 20, the wire 17 of the lifting winch 16 is looped around the first upper pulley 25 and the first lower pulley 26 in an N-shaped fashion. Specifically, the tip side portion of the wire 17 extends downward from the first upper pulley 25 and is connected to the upper portion of the weight connection portion 24 . As a result, the tip side portion of the wire 17 is connected to the upper portion of the same weight connecting portion 24 in a manner in which the weight connecting portion 24 is suspended. On the other hand, the proximal end portion of the wire 17 extends downward from the distal end portion of the boom 14 to the first lower pulley 26 . As a result, the base end portion of the wire 17 is extended in such a manner that the weight of the weight 23 acts to pull the wire 17 downward.

The wire 17 of the lifting winch 16 is provided with a detection portion 21A of a tension meter 21 for detecting the tension of the wire 17 . The tension meter 21 is of a wireless type, and includes a detection section 21A for detecting and outputting the tension of the wire 17, and a display section 21B for receiving the output signal of the detection section 21A and displaying the detected value of the tension. have. In this embodiment, the tension meter 21 corresponds to the tension detector.

The test system 20 has a test winch 29 for moving the weight 23 up and down. The test winch 29 is provided on the side of the weight 23 on the side opposite to the first lower pulley 26 (on the left side in FIG. 4). A second upper pulley 30 is arranged above the weight 23 . The second upper pulley 30 is attached to the portal crane 28 like the first upper pulley 25 . A second lower pulley 31 is arranged between the weight 23 and the test winch 29 on the side of the weight 23 .

A wire 32 as a second sling rope of the test winch 29 is hung on the second upper pulley 30 and the second lower pulley 31 . One end of the wire 32 extends downward from the second upper pulley 30 and is connected to the upper portion of the weight connecting portion 24 . As a result, one end of the wire 32 is connected to the upper portion of the weight connecting portion 24 in such a manner as to suspend the weight connecting portion 24 . The other end of the wire 32 extends laterally from the second lower pulley 31 and is wound around the drum 33 of the test winch 29 .

In this embodiment, the wire 17 of the lifting winch 16 and the wire 32 of the test winch 29 are connected to the weight connecting portion 24 via pulleys 25 , 26 , 30 and 31 . As a result, the weight connecting portion 24 can be hung separately from the wire 17 of the lifting winch 16 and the wire 32 of the test winch 29 so as not to interfere with each other.

As shown in FIGS. 4 and 5, the test winch 29 includes a wire 32 as a second sling, a drum 33 around which the wire 32 is wound, an electric motor 34 for rotating the drum 33, and a brake for braking the rotation of the drum 33. It has a brake device 35 and the like that One end of the wire 32 is fixed to the drum 33, while the other end of the wire 32 is provided with a weight connecting portion 24. As shown in FIG.

When the electric motor 34 is driven to rotate the drum 33 in one direction with the weight 23 suspended from one end of the wire 32, the wire 32 is wound around the drum 33 and the weight 23 is raised. . On the other hand, when the electric motor 34 is driven to rotate the drum 33 in the other direction while the weight 23 is suspended from one end of the wire 32, the wire 32 is let out from the drum 33 and the weight 23 is lowered.

Test system 20 includes control panel 36 . The control panel 36 has a touch panel type operation panel 37 . Various operations related to the test by the test system 20, such as test pattern setting and switching of the test execution mode (execution start or stop), are performed through the operation of the operation panel 37. FIG.

The control board 36 has an inverter 38 that controls the operation of the electric motor 34 . The control panel 36 is provided with an electronic control unit 39 mainly composed of, for example, a microcomputer. The electronic control unit 39 receives an output signal from the operation panel 37 and is connected to an inverter 38 and a brake device 35 . The electronic control unit 39 performs various calculations based on the output signal of the operation panel 37, and based on the calculation results, controls the operation of the electric motor 34 (specifically, the inverter 38) and the brake device 35. do. Note that in this embodiment, the inverter 38 and the electronic control device 39 correspond to the control unit.

A position sensor 40 for detecting the winding amount of the wire 32 is provided on the test winch 29 (FIG. 4). In the test system 20 of this embodiment, the winding amount of the wire 32 is detected by the position sensor 40 as an index value of the vertical position of the weight 23 . A detection signal of the position sensor 40 is taken into the electronic control unit 39 . In the test system 20 of the present embodiment, the control amount of the inverter 38 and the control amount of the brake device 35 are controlled by the electronic control unit 39 so that the control target value for the vertical position of the weight 23 matches the actual position. Feedback controlled.

In the test system 20 of the present embodiment, the wire 32 of the test winch 29 is wound up and unwound in such a manner that the weight 23 is moved up and down following the variation of the wavefront of the standard wave. Specifically, as shown in FIG. 6, the wire 32 of the test winch 29 is wound and unwound so that the curve showing the relationship between the vertical position of the weight 23 and the elapsed time forms a trochoid wave or a sinusoidal wave. is performed. It is also conceivable to perform the operation of moving the weight 23 up and down through the cargo handling operation of a forklift. Since the cargo handling device of a forklift has a narrow movement speed range and movement width of cargo, when the weight 23 is moved up and down by the forklift, the degree of freedom in setting the movement pattern (test pattern) of the same weight 23 is low. . Moreover, in this case, there is also a problem that the test cannot be stably performed under a certain condition because the operation mode of the forklift truck varies. In the test system 20 of the present embodiment, an electric motor 34 capable of precise control (speed control, torque control) is used as a configuration for moving the weight 23 up and down. Therefore, the movement pattern of the weight 23 can be set with a high degree of freedom through the operation control of the electric motor 34 . Moreover, the test can be properly performed in a stable state under constant conditions.

In the test system 20 of the present embodiment, the winding operation and the unwinding operation of the wire 32 of the test winch 29 are performed at a predetermined cycle T and speed V (specifically, a vertical movement width H), alternating. A plurality of test patterns determined by the period T and the movement width H are determined so as to simulate situations corresponding to Beaufort wind scales (5) to (9). Specifically, as the test pattern A corresponding to the most severe situation (Beaufort wind scale (9)), a test pattern with a period T of "12.7 seconds" and a movement width H of "8.5 m" is determined. ing. In addition, Beaufort wind scale (8) equivalent test pattern B, Beaufort wind scale (7) equivalent test pattern C, Beaufort wind scale (6) equivalent test pattern D, Beaufort wind scale (5) equivalent A test pattern E is defined.

In this embodiment, based on the results of various experiments and simulations by the inventors, test patterns A to E capable of simulating situations corresponding to Beaufort wind scales (5) to (9) are prepared in advance. These test patterns A to E are stored in the memory 41 of the electronic control unit 39 in advance.

A test of the onboard watercraft hoisting device 10 by the test system 20 of the present embodiment is performed as follows.
First, as shown in FIG. 4 , the watercraft hoisting device 10 to be tested is attached to the base 22 of the test system 20 . A weight 23 having a weight corresponding to that of the boat 12 is attached to the weight connecting portion 24 of the test system 20 . The wire 17 of the hoisting winch 16 of the boat hoisting device 10 is hooked to the first lower pulley 26 and the first upper pulley 25, and the link 18 at the tip of the wire 17 is connected to the weight connecting portion 24. be. Furthermore, one of the test patterns A to E is selected through operation of the control panel 36 .

After that, the selector switch of the boat lifting device 10 is turned on to activate the auto-tension function. Then, in this state, the control panel 36 is operated, and the test of the boat lifting device 10 by the test system 20 is started.

As a result, as indicated by a two-dot chain line in FIG. 4, the weight 23 engaged with the wire 17 of the lifting winch 16 is subjected to the selected test pattern (period T and movement width H, an example of which is shown in FIG. 6). to repeat up and down movements.

In this test, the tester monitors the tension P displayed on the display section 21B of the tension meter 21 when the weight 23 moves up and down. When the tension P is maintained at a predetermined value or higher, it is determined that the wire 17 of the lifting winch 16 is not unnecessarily loosened and the auto-tension function is properly operating. done. On the other hand, when the tension P displayed on the tension meter 21 is less than the predetermined value, it is assumed that the wire 17 of the lifting winch 16 is unnecessarily loosened and the auto-tension function is not operating properly. , an abnormality determination is made.

According to this embodiment, the following effects can be obtained.
(1) According to the test system 20 of the present embodiment, by connecting the weight 23 to the wire 17 of the lifting winch 16 , it is possible to simulate a situation in which the boat 12 is suspended from the wire 17 . In addition, the test winch 29 (specifically, the electric motor 34 that is the power source) is controlled to move the weight 23 up and down at a predetermined period T and movement width H, thereby suspending the test winch 16 from the wire 17 of the lifting winch 16 . It is possible to highly accurately simulate a situation in which the mounted boat 12 in the suspended state moves up and down following changes in the wavefront. Therefore, it is possible to properly check the performance of the lifting winch 16 for lifting and lowering the boat 12 in such a situation.

(2) The boat hoisting device 10 adjusts the hoisting force of the hoisting winch 16 according to the up-and-down movement of the boat 12 according to the fluctuation of the water surface so that the wire 17 does not loosen when the boat 12 is lifted and lowered. It has an auto-tension function that automatically adjusts. According to the test system 20 of the present embodiment, the tension of the wire 17 of the lifting winch 16 is measured when the weight 23 is moved up and down at a predetermined cycle T and speed V through the operation control of the test winch 29. Therefore, it can be confirmed that the wire 17 is not loosened when the boat 12 is lifted and lowered from the sea surface.

(3) In the test patterns A to E, the wire 32 of the test winch 29 was wound up and unwound in such a manner that the weight 23 was moved up and down following the fluctuation of the wavefront of the standard wave. As a result, since the test system 20 can simulate a situation close to the actual operation of the boat hoisting device 10, the performance of the boat hoisting device 10 for lifting and lowering the boat 12 can be evaluated with high accuracy. You can check with

(4) The wire 17 of the lifting winch 16 is hooked on the first upper pulley 25 and the first lower pulley 26 in an N-shaped manner. As a result, the weight 23 can be suspended at a position away from the boat lifting device 10 . Therefore, the weight 23 and the weight connecting portion 24 can be hung separately from the wire 17 of the lifting winch 16 and the wire 32 of the test winch 29 so as not to interfere with each other.

(5) A tension meter 21 is provided to detect the tension of the wire 17 of the lifting winch 16 . Therefore, compared with the case of visually confirming the state of the wire 17 of the lifting winch 16, the wire 17 of the lifting winch 16 does not loosen when the boat 12 is lifted by the boat lifting device 10. can be determined with high accuracy.

It should be noted that the above embodiment can be implemented with the following modifications. The above embodiments and the following modifications can be combined with each other within a technically consistent range.

If the weight 23 and the weight connection part 24 can be suspended separately from the wire 17 of the lifting winch 16 and the wire 32 of the test winch 29 so as not to interfere with each other, the pulleys 25, 26, 30, 31 can be omitted.

・Instead of selecting one of a plurality of predetermined test patterns A to E as the test pattern in the test system 20, an arbitrary value can be set for the period T and the movement width H through the operation of the operation panel 37. You may make it define by inputting.

- The tension meter 21 can be omitted. In this case, by visually confirming the state of the wire 17 itself of the lifting winch 16, it is possible to determine whether or not the wire 17 is loosened.

- A tension sensor for detecting the tension of the wire 17 may be provided, and the output signal of the tension sensor may be taken into the electronic control unit 39 or an external device (such as a notebook computer). With such a configuration, it is possible to display the tension from time to time and to display the transition of the tension, so that it is possible to determine whether or not the wire 17 is loosened based on the displayed contents. In addition, it is possible to determine whether or not there is an abnormality based on the detection signal of the tension sensor, and to display the determination result on the control panel 36 or an external device.

- The wire 32 of the test winch 29 is wound up and unwound in such a manner that the relationship between the vertical position of the weight 23 and the elapsed time (see Fig. 6) forms a line other than a trochoidal wave. may For example, based on the results of experiments and simulations, it is possible to obtain a wavefront variation pattern in a standard wave and determine the above relationship so as to match the same variation pattern. In addition, it is also possible to perform the winding operation and the unwinding operation of the wire 32 of the test winch 29 in a mode in which the above relationship forms a sine wave line or a triangular wave line.

・The test system according to the above embodiment includes a lifting device that collects floating objects (garbage, rescuers, etc.) from the surface of the water using a net as the object, and an object in the water (a manned submersible research vessel or an autonomous type It can also be applied to a lifting device for lifting and lowering an unmanned submersible, etc.). In such a test system as well, when an object suspended by the wire 17 of the lifting winch 16 is near the water surface, it is confirmed that the wire 17 of the lifting winch 16 does not loosen according to the vertical movement of the water surface. be able to. The load applied to the wire 17 of the lifting winch 16 differs depending on whether the object suspended from the wire 17 is in water or in the air. According to the above test system, by controlling the torque of the test winch 29 (specifically, the electric motor 34) in accordance with such a difference in load, and adjusting the load applied to the wire 17 of the lifting winch 16, It is possible to appropriately confirm the performance of the lifting winch 16 for collecting floating matter from the water surface and the performance for lifting and lowering an object in water. In this case, the torque of the test winch 29 (specifically, the electric motor 34) may be controlled in such a manner that the load applied to the wire 17 of the lifting winch 16 fluctuates according to a predetermined test pattern.

- The test system according to the above embodiment can also be applied to a lifting device that does not have an auto-tension function. According to this configuration, it is possible to confirm that the tension applied to the wire of the lifting winch falls within a predetermined allowable range.

- The test system concerning the said embodiment is applicable also to the lifting device provided in the land (for example, quay).
- The test system according to the above embodiment can be applied to a lifting device 45 having a lifting winch 46 for lifting and lowering an object 43, like a test system 50 shown in FIG. According to the same configuration, through the operation control of the test winch 59 (specifically, the electric motor 54) by the electronic control device 58, a load that fluctuates in a predetermined test pattern can be applied to the wire 47 of the lifting winch 46. can. As a result, the situation in which the load fluctuating in the test pattern is applied to the wire 47 of the lifting winch 46 can be simulated with high accuracy. can be verified.

DESCRIPTION OF SYMBOLS 10... Mounting boat lifting device 11... Mother ship 12... Mounting boat 16, 46... Lifting winch 17, 47... Wire 20, 50... Test system 21... Tension meter 23, 43... Weight 25... First upper pulley 26... No. 1 lower pulley 29, 59 test winch 32 wire 34, 54 electric motor 38 inverter 39, 58 electronic controller 45 lifting device

Claims (6)

A lifting winch that has an arm section to which a first sling cable is hung, and operates in a state where an object is suspended by the first sling cable from a tip portion of the arm section to raise and lower the same object. A test system applied to a lifting device comprising:
In the test system, a weight corresponding to the weight of the object and one of the objects are suspended from one end of a second sling, and an electric motor as a power source is operated to move the one up and down. a winch;
A first lower pulley that is a fixed pulley provided below the tip portion of the arm, a first upper pulley that is a fixed pulley provided above the one, and a fixed pulley provided on the side of the test winch. a certain second lower pulley and a second upper pulley which is a fixed pulley provided above the one;
A control unit that controls the operation of the electric motor in a manner in which the load applied to the first sling cable fluctuates in a predetermined test pattern ,
The first suspension cable is hung from the arm portion to the first lower pulley and the first upper pulley to suspend the one,
A testing system for a lifting device, wherein the second sling rope is hung from the test winch to the second lower pulley and the second upper pulley to suspend the one. The hoisting winch is for hoisting and lowering the boat as the object,
The test system includes a weight having a weight equivalent to that of the boat on board, and a connection connecting the first sling line and the weight in such a manner that the weight of the weight acts in a direction that pulls the first sling line downward. has a part,
The lifting device according to claim 1, wherein the control unit controls the operation of the electric motor in a manner in which the second sling cable is alternately wound and unwound at a predetermined cycle and speed. test system. The hoisting device automatically adjusts the hoisting force of the hoisting winch according to the vertical movement of the hoisting boat according to the fluctuation of the water surface so that the first sling cable does not loosen when the hoisting boat is hoisted and lowered. 3. The lifting device testing system according to claim 2, having the function of The lift according to claim 2 or 3, wherein the control unit causes the second sling cable to be wound and unwound in a manner in which the weight is moved up and down following fluctuations in the wave surface of a standard wave. Descending equipment test system. The lifting device test according to any one of claims 1 to 4, wherein the first sling is hung on the first lower pulley and the first upper pulley in an N-shaped manner. system. A testing system for a lifting device according to any one of claims 1 to 5, further comprising a tension detector for detecting tension of the first sling.

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