KR102797516B1 - Water jet thrust test system to which the weight calibration method of the load cell is applied and water jet thrust test method using thereof - Google Patents

Abstract

The present invention relates to a waterjet thrust test system and a waterjet thrust test method using the same, which enables a thrust test to be performed by using waterjets of various sizes interchangeably, and which can significantly reduce the error rate occurring during installation by simply moving and installing a waterjet in a state where the setting is complete into a tank, and in particular, to a load cell weight correction method that uses the load of the weight to pull the waterjet toward a load cell and close it so that the thrust is concentrated entirely on the load cell.

Description

WATER JET THRUST TEST SYSTEM TO WHICH THE WEIGHT CALIBRATION METHOD OF THE LOAD CELL IS APPLIED AND WATER JET THRUST TEST METHOD USING THEREOF

The present invention relates to a waterjet thrust test system to which a load cell weight correction method is applied and a waterjet thrust test method using the same, and more specifically, to a waterjet thrust test system to which a load cell weight correction method is applied, and a waterjet thrust test method using the same, which enables a thrust test to be performed by making it possible to use waterjets of various sizes interchangeably, and significantly reduce the error rate occurring during installation by simply moving and installing a waterjet in a set-up state into a water tank, and in particular, to a waterjet thrust test system to which a load cell weight correction method is applied, and a waterjet thrust test method using the same, which enables thrust to be concentrated entirely on a load cell by pulling the waterjet toward a load cell and pressing it closely.

In general, a waterjet is a device that generates propulsive force by the discharge pressure of water, replacing a propeller used as an underwater driving device such as a ship, submarine, or amphibious vehicle. The waterjet rotates an impeller by a waterjet drive shaft, and flowing water is introduced through a waterjet housing. The flowing water is discharged to the stator side by the propulsive force generated by the impeller, thereby generating propulsive force that allows the underwater driving device to move underwater.

Meanwhile, the size and type of these water jets should be applied differently depending on the size of the ship, the horsepower (output) of the mounted engine, etc. In particular, in order to test the thrust of each water jet, each water jet must be fixedly installed in a test space within the tank, but in the past, there was a problem that a separate fixing frame had to be manufactured for each water jet according to its size.

In addition, since the size and load of the waterjet are considerable, when installing the waterjet in the tank and setting up the test environment, the waterjet and fixed frame must be moved to the tank separately and installed and set up. In this process, there was a problem that a physical error occurred between the load cell that tests the thrust and the waterjet, affecting the results of the thrust test.

Accordingly, the inventors of the present invention have developed a technology that enables testing to be performed by interchanging water jets of different sizes, and significantly reduces the occurrence of physical errors by completing test settings in advance before moving them to a water tank.

Korean Patent Publication No. 10-2011-0104680

The present invention aims to solve the above problems by providing a waterjet thrust test system and a waterjet thrust test method using the same, which are capable of conducting a thrust test by making waterjets of various sizes compatible, and which can significantly reduce the error rate occurring during installation by simply moving and installing the waterjet in a set-up state into a tank, and in particular, a load cell weight correction method that pulls the waterjet toward a load cell using the load of the weight to make it close so that the thrust is concentrated entirely on the load cell.

A waterjet thrust test system to which a load cell weight correction method according to one embodiment of the present invention is applied includes a gantry crane (110) installed along the longitudinal direction on the upper side of a test tank (1), a hydrojet bogie assembly (120) on which a test waterjet is installed, an adapter frame assembly (130) on which the hydrojet bogie assembly (120) is installed, a bogie fixing frame assembly (140) that is provided to be movable along a rail (2) provided in the longitudinal direction of the test tank (1) and on which the adapter frame assembly (130) is installed and the height of the adapter frame assembly (130) can be adjusted, and an engine bogie (150) that is provided to be movable along the rail (2) and on which an engine coupled to a test waterjet is installed, and by the weight provided on the hydrojet bogie assembly (120), the hydrojet bogie assembly (120) is fixed to the adapter frame. It can be closely fixed to a load cell provided in the assembly (130).

In one embodiment, the gantry crane (110) may include a hoist (111) connected to the hydrojet bogie assembly (120) and the adapter frame assembly (130).

In one embodiment, the hydrojet bogie assembly (120) comprises a frame (121) having an internal space for accommodating a test waterjet, a conversion adapter (122) installed and fixed to the frame (121) and having different shapes depending on the size of the test waterjet, on which the test waterjet is mounted, a torque meter (123) having one end connected to the output shaft of the test waterjet and measuring torque applied to the output shaft of the test waterjet, a pulley box (124) having one end connected to the torque meter (123) and the other end connected to the output shaft of an engine mounted on the engine bogie (150) and converting and transmitting the rotational power of the engine to correspond to the rotational speed range of the test waterjet, a pin block bracket device (125) provided on the outside of the frame (121) and configured to be height-adjustable in the vertical direction, a pulling frame assembly (127) installed on the frame (121), and the pulling frame. It may include a weight (128) connected to the assembly (127) via a wire.

In one embodiment, the pulley box (124) may include a pulley connected to the output shaft of the engine and a pulley connected to the output shaft of the test water jet.

In one embodiment, the pin block bracket device (125) may include a pin block bracket (125-1) installed longitudinally on both sides of the frame (121), a plurality of pin blocks (125-2) provided on the pin block bracket (125-1) and fixed to the adapter frame assembly (130) by engaging with each other in the vertical direction, a height adjustment means (125-3) having an upper side rotatably connected to the frame (121) and a lower side vertically connecting by penetrating the pin block bracket (125-1) and being screw-connected to the pin block bracket (125-1) through screw threads formed along the outer circumference, and a plurality of height adjustment laser sensors (125-4) provided on the upper side of each of the plurality of pin blocks (125-2) and measuring the real-time height of the pin block bracket (125-1) by irradiating a laser onto each pin block (125-2).

In one embodiment, the adapter frame assembly (130) may include a frame (131) having an internal space for accommodating the frame (121), a pair of LM assemblies (132) that are arranged to face each other on both sides of the frame (131) and are interlocked and coupled by the pin block (125-2) so that the hydrojet bogie assembly (120) is fixed, a load cell (133) that is arranged on the inside of the frame (131) and measures the thrust generated by the test water jet while in contact with one side of the accommodated frame (121), and a pulley frame (134) that is installed on the outside of the frame (131) and includes a pulley (134a) on which a wire connected to the pulling frame assembly (127) is hung, and that supports the weight (128) connected to the wire so that a load is applied in a downward direction.

In one embodiment, the LM assembly (132) comprises: a base frame (132-1) that is supported on the frame (131) to adjust the protrusion length so as to fit the width of the frame (121) of the hydrojet bogie assembly (120); a cradle pin (132-2) that is provided on the base frame (132-1) and is fixed by engaging with the pin block bracket (125-1) while protruding toward the inside of the frame (131) and is provided to be able to slide in the longitudinal direction of the base frame (132-1); a sliding rail (132-3) that is installed on the base frame (132-1) and guides the sliding movement of the cradle pin (132-2); a watertight cover (132-4) that covers the base frame (132-1); a flexible cover (132-5) that is provided on the watertight cover (132-4); and a flexible cover (132-5) that is provided on the watertight cover (132-4). It includes an oil level check window (132-6) provided, an oil drain plug (132-7) provided on the base frame (132-1), and an oil filler plug (132-8) provided on the watertight cover (132-4), wherein the cradle pin (132-2) protrudes outwardly through the flexible cover (132-5), and the space between the base frame (132-1) and the watertight cover (132-4) can be filled with lubricating oil for lubricating horizontal movement of the cradle pin (132-2).

In one embodiment, as the wire is pulled by the load of the weight (128) while being hung on the pulley (134a), the frame (121) can be brought into close contact with the load cell (133).

In one embodiment, the bogie fixed frame assembly (140) may include a frame (141), one or more hydraulic cylinders (142) for raising or lowering the adapter frame assembly (130) in a vertical direction, a hydraulic power pack (143) for providing hydraulic pressure to the hydraulic cylinders (142) and the adapter frame assembly (130), a track wheel (144) provided at the lower portion of the frame (141) and rotating along the rail (2), a bogie drive gearbox (145) for driving the track wheel (144), and a junction box (146) electrically connected to the hydraulic power pack (143).

A waterjet thrust test method using a waterjet thrust test system to which a load cell weight calibration method according to another embodiment of the present invention is applied comprises the steps of: installing a hydrojet bogie assembly (120) on which a test waterjet is installed into an adapter frame assembly (130) on a fixed frame (135) on land using a hoist (111) of a gantry crane (110); positioning and fixing a load cell (133) of the adapter frame assembly (130) to the frame (131) so that the center line of the load cell (133) is aligned with the center line of the test waterjet nozzle; positioning a pulley frame (134) so that a horizontal part of a wire connected to a weight (128) is aligned with the center line of the waterjet nozzle and calibrating the waterjet thrust test device; separating the pulling frame assembly (127), the wire, and the weight (128) from the hydrojet bogie assembly (120) so that they do not interfere during the waterjet thrust test after the calibration; The frame (134) may include a step of separating the adapter frame assembly (130), a step of lowering the hydrojet bogie assembly (120) and the adapter frame assembly (130) into the bogie fixed frame assembly (140) fixed to the test position of the test tank (1) using a gantry crane (110) and then fixing them, a step of moving the engine bogie (150) in a straight line toward the hydrojet bogie assembly (120), connecting the output shaft of the engine and the hydrojet bogie assembly (120), and generating thrust of the test waterjet through the rotational power of the engine, and a step of measuring the thrust generated by the test waterjet through a load cell included in the adapter frame assembly (130).

According to the present invention, it is possible to conduct a thrust test by using water jets of various sizes interchangeably, and it has the advantage of significantly reducing the error rate occurring during installation by simply moving and installing the water jet in a set-up state into a tank.

In addition, according to the present invention, by pulling the water jet toward the load cell and pressing it inward using the load of the weight, there is an advantage in that the thrust can be completely concentrated on the load cell.

FIG. 1 is a drawing showing the overall form of a water jet thrust test system (100) to which a load cell weight calibration method according to one embodiment of the present invention is applied.
Figure 2 is a drawing showing the gantry crane (110) in more detail.
Figure 3 is a drawing showing the hydrojet bogie assembly (120) in more detail.
Figure 4 is a drawing showing a state in which the height of the pin block bracket (125-1) changes depending on the size of the test water jet.
Figure 5 is a drawing showing the conversion adapter (122) in more detail.
Figure 6 is a drawing showing a state in which different types of conversion adapters (122) are installed depending on the size of the test water jet.
Figure 7 is a drawing showing the adapter frame assembly (130) in more detail.
FIG. 8 is a drawing showing a state in which the LM assembly (132) of the adapter frame assembly (130) slides inwardly on both sides of the frame (131) to match the width of the hydrojet bogie assembly (120) frame (121) and is coupled with the hydrojet bogie assembly (120).
Figure 9 is a drawing showing the LM assembly (132) in more detail.
Figure 10 is a drawing showing a state in which the cradle pin (132-2) of the LM assembly (132) slides.
Figure 11 is a drawing showing a state in which the LM assembly (132) is coupled to the pin block (125-2).
Figure 12 is a drawing showing a state in which a pulling frame assembly (127) and a pulley frame (134) are connected via wires.
Figure 13 is a drawing showing a state in which a pulling force is applied to the hydrojet bogie assembly (120) in the direction of the load cell (133) through the weight (128).
Figure 14 is a drawing comparing a conventional calibration method (a) for calibrating a load cell (133) signal value and a calibration method (b) according to the present invention.
Figure 15 is a drawing showing the process of performing calibration by bringing the hydrojet bogie assembly (120) into close contact with the load cell (133) through the weight (128).
Figure 16 is a drawing showing the bogie fixing frame assembly (140) in more detail.
Figure 17 is a drawing showing a state in which an adapter frame assembly (130) to which a hydrojet bogie assembly (120) is coupled is installed on a bogie fixed frame assembly (140).
Figure 18 is a drawing showing a state in which a hydrojet bogie assembly (120) coupled to an adapter frame assembly (130) by a bogie fixing frame assembly (140) is adjusted in height in the vertical direction above a test tank (1).
FIG. 19 is a drawing showing a process of conducting a thrust test of a test water jet using a water jet thrust test system (100) to which a load cell weight calibration method according to one embodiment of the present invention is applied.

Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein.

In order to clearly explain the present invention, parts irrelevant to the description are omitted, and the same reference numerals are used for identical or similar components throughout the specification.

In addition, in various embodiments, components having the same configuration are described only in representative embodiments using the same reference numerals, and in other embodiments, only configurations different from the representative embodiments are described.

Throughout the specification, when a part is said to be "connected" to another part, this includes not only "directly connected" but also "indirectly connected" with other elements in between. Also, when a part is said to "include" a component, this may mean including the other component rather than excluding the other component, unless otherwise specifically stated.

FIG. 1 is a drawing showing the overall form of a water jet thrust test system (100) to which a load cell weight calibration method according to one embodiment of the present invention is applied.

A waterjet thrust test system (100) to which a load cell weight correction method according to one embodiment of the present invention is applied is largely configured to include a gantry crane (110), a hydrojet bogie assembly (120), an adapter frame assembly (130), a bogie fixing frame assembly (140), and an engine bogie (150).

First, the gantry crane (110) is installed along the longitudinal direction on the upper side of the test tank (1) and is arranged so that it can freely move in the longitudinal direction of the test tank (1). This will be examined in more detail with reference to Fig. 2.

Figure 2 is a drawing showing the gantry crane (110) in more detail.

Referring to Fig. 2, the gantry crane (110) moves freely along a guide rail installed on an H-beam-shaped frame installed in the longitudinal direction of the test tank (1), and at this time, the hydrojet bogie assembly (120) and the adapter frame assembly (130), which will be described later, are placed in a dedicated position within the test tank (1) via a hoist (111). At this time, a test water jet is pre-installed (mounted) on the hydrojet bogie assembly (120).

Returning to FIG. 1 again, the hydrojet bogie assembly (120) means a kind of fixed frame on which the test waterjet is installed, and even if the sizes of various types of test waterjets are different, they are fixed by the hydrojet bogie assembly (120), so that the measurement center of the load cell (133), which is a thrust measuring sensor, and the nozzle of the test waterjet can be positioned on the same horizontal line. This means that the maximum thrust of the test waterjet nozzle can be concentrated on the center of the load cell, so that the thrust measurement error is significantly reduced. The hydrojet bogie assembly (120) will be examined in more detail with reference to FIGS. 3 to 6.

FIG. 3 is a drawing showing a hydrojet bogie assembly (120) in more detail, FIG. 4 is a drawing showing a state in which the height of a pin block bracket (125-1) changes depending on the size of a test waterjet, FIG. 5 is a drawing showing a conversion adapter (122) in more detail, and FIG. 6 is a drawing showing a state in which conversion adapters (122) of different shapes are installed depending on the size of a test waterjet.

Looking at FIGS. 3 to 6, the hydrocart assembly (120) has the primary role of fixing the test waterjet, and by fixing the vertical height and left-right position of the fixed test waterjet to a specific position, it serves to ensure that the measurement center of the load cell (133), which is a thrust measuring sensor, and the nozzle of the test waterjet are positioned on the same line.

This hydrocart assembly (120) may be configured to include a frame (121), a conversion adapter (122), a torque meter (123), a pulley box (124), a pin block bracket device (125), a lifting ring (126), a pulling frame assembly (127), and a weight (128).

In the case of the frame (121), an internal space of sufficient size is formed on the inside to accommodate a test water jet. At this time, the size of the internal space is such that it can accommodate a test water jet of a small size to a test water jet of a relatively large size. The inside of the frame (121) has an internal space sufficient to accommodate a test water jet.

A conversion adapter (122) is installed and fixed to the lower side of the frame (121) and provides a space for the test water jet to be installed.

This conversion adapter (122) basically has an L-shape, and the vertically upright area is fixed to the frame (121), and the test water jet is installed in the horizontally flat area.

The measurement center line of the test water jet fixed by the conversion adapter (122) varies depending on the size of the test water jet. To compensate for this, a pin block bracket device (125) is provided on the frame (121). This will be described later.

Since one side of the torque meter (123) is connected to the output shaft of the test water jet, when the thrust of the test water jet is generated by the power of the engine provided on the engine carriage (150) described later, it measures the torque applied to the output shaft of the test water jet.

The pulley box (124) has one side connected to the torque meter (123) and the other side connected to the output shaft of the engine provided on the engine bogie (150), and serves to convert and transmit the rotational power of the engine to correspond to the rotational speed range of the test waterjet. This pulley box (124) is configured to include one pulley connected to the output shaft of the engine and the other pulley connected to the output shaft of the test waterjet, and converts the rotational power of the engine to the impeller rotational speed range of the test waterjet and transmits it to the output shaft of the test waterjet, thereby enabling the test waterjet to generate thrust.

The pin block bracket device (125) is provided longitudinally on both outer sides of the frame (121) and is provided so that the height can be adjusted in the up-down direction.

More specifically, the pin block bracket device (125) is configured to include a pin block bracket (125-1), a plurality of pin blocks (125-2), a height adjustment means (125-3), and a laser sensor for height adjustment (125-4).

The pin block bracket (125-1) is composed of a horizontal pin block bracket (125-1a) installed longitudinally on both sides of the frame (121) and a plurality of vertical pin block brackets (125-1b) that guide the vertical movement of the horizontal pin block bracket (125-1a).

A plurality of vertical pin block brackets (125-1b) are arranged at regular intervals on both sides of the frame (121), and a horizontal pin block bracket (125-1a) is capable of sliding vertically while being engaged with a slit provided in each of the plurality of vertical pin block brackets (125-1b). At this time, a plurality of pin blocks (125-2) are provided in the pin block bracket (125-1), and the plurality of pin blocks (125-2) are engaged with and engaged with the cradle pins (132-2) of the LM assembly (132).

In addition, a block having a screw line formed along the inner surface is provided on one side of the horizontal pin block bracket (125-1a), and a height adjustment means (125-3) is screw-connected to the block.

The height adjustment means (125-3) is rotatably connected to the frame (121) at the upper side, and is connected by penetrating a block provided in a horizontal pin block bracket (125-1a) at the lower side, and has screw threads formed along the outer surface. A handle is provided on the upper side of the height adjustment means (125-3). The height adjustment means (125-3) rotates according to the operating direction of the handle, and at this time, the screw threads formed on the outer surface of the height adjustment means (125-3) and the screw lines formed along the inner surface of the block provided in the horizontal pin block bracket (125-1a) are screw-connected to each other, so that the height of the horizontal pin block bracket (125-1a) is adjusted in the vertical direction.

This configuration can be used to raise the propulsion centerline of a small test waterjet to match the centerline of the load cell (133), or to lower the propulsion centerline of a large test waterjet to match the centerline of the load cell (133).

In addition, each of the plurality of pin blocks (125-2) is fixed to the cradle pin (132-2) of the LM assembly (132) while interlocking with each other in the vertical direction. At this time, since the cradle pin (132-2) itself can slide horizontally, the horizontal sliding movement of the hydrojet bogie assembly (120) is performed in conjunction with the cradle pin (132-2).

In addition, the pin blocks (125-2) interlocked in the vertical direction can be fixed to each other by interlocking them with bolts (e.g., M20 hex bolts, etc.), and by releasing the bolts to release the interlocked pin blocks (125-2), the pin blocks (125-2) and the cradle pins (132-2) can be separated.

In addition, a laser sensor (125-4) for height adjustment is provided on the upper surface of a pin block (125-2) particularly positioned at the lower side among a plurality of pin blocks (125-2) to precisely measure the real-time height of a horizontal pin block bracket (125-1a) by irradiating the pin block (125-2) with a laser.

The height adjustment laser sensor (125-4) irradiates a laser to the center of the engraved area at the center of the upper side of the pin block (125-2), and based on this, precisely measures the real-time height of the horizontal pin block bracket (125-1a). After the rough height of the horizontal pin block bracket (125-1a) is adjusted through the rotation of the height adjustment means (125-3) described above, more precise height adjustment of the horizontal pin block bracket (125-1a) is possible based on the sensing result of the height adjustment laser sensor (125-4). After precise height adjustment, another pin block (125-2) is covered with the corresponding pin block 125-2) and bolted and fixed.

Additionally, a number of lifting rings (126) are provided on the upper side of the frame (121) to be connected to the hoist (111) discussed above.

In addition, a U-shaped falling frame assembly (127) is installed on the outside of the frame (121) to apply a load toward the load cell (133) to the frame (121) by the dead weight of the weight when calibrating the test device.

A shackle (127a) is provided at the end of the falling frame assembly (127) to catch the wire. Accordingly, when the wire is pulled by the load of the weight (128) caught on the wire, the frame (121) itself connected to the falling frame assembly (127) is pulled. In order to pull the frame (121) to the same point of application of the thrust caused by the injection of the test water jet, the shackle (127a) and the falling frame assembly (127) are connected to the frame (121) at a position where the center line of the shackle (127a) and the falling frame assembly (127) coincide with the center line of the water jet nozzle.

Next, the adapter frame assembly (130) is an area where the hydrojet bogie assembly (120) discussed above is installed, and the hydrojet bogie assembly (120) is fixed to the adapter frame assembly (130) by the interlocking connection between the pin block (125-2) of the hydrojet bogie assembly (120) and the cradle pin (132-2) of the LM assembly (132). This will be examined in more detail with reference to FIGS. 7 to 13.

FIG. 7 is a drawing showing the adapter frame assembly (130) in more detail, FIG. 8 is a drawing showing a state in which the LM assembly (132) of the adapter frame assembly (130) slides inwardly on both sides of the frame (131) to match the width of the hydrojet bogie assembly (120) frame (121) and is coupled with the hydrojet bogie assembly (120), FIG. 9 is a drawing showing the LM assembly (132) in more detail, FIG. 10 is a drawing showing a state in which the cradle pin (132-2) of the LM assembly (132) slides and moves, FIG. 11 is a drawing showing a state in which the LM assembly (132) is engaged with the pin block (125-2), FIG. 12 is a drawing showing a state in which the pulling frame assembly (127) and the pulley frame (134) are connected through wires, and FIG. 13 is a drawing showing a state in which the weight (128) is This is a drawing showing a state in which a pulling force is applied to a hydrojet bogie assembly (120) in the direction of a load cell (133).

Looking at FIGS. 7 to 13, the adapter frame assembly (130) is configured to include a frame (131), a pair of LM assemblies (132), a load cell (133), and a pulley frame (134).

First, the frame (131) corresponds to the area where the hydrojet bogie assembly (120) discussed above is received and fixed, and an internal space is formed on the inside to receive the hydrojet bogie assembly (120).

A pair of LM assemblies (132) are provided on both sides of the inner surface of the frame (131), and are positioned at a height that allows for meshing with the pin block (125-2) of the hydrojet bogie assembly (120).

The LM assembly (132) is composed of a base frame (132-1), a cradle pin (132-2), a sliding rail (132-3), a watertight cover (132-4), a flexible cover (132-5), an oil level inspection window (132-6), an oil drain plug (132-7), and an oil filler plug (132-8).

The base frame (132-1) is configured in a T-shape, and rails and rail blocks are formed on the upper and lower frames, and the frame (131) combined with the rail blocks supports the base frame (132-1), so that the base frame (132-1) can move in the direction of the rails. In addition, a distance adjustment means is provided so that the length is adjusted by being guided on both sides of the frame (131) to match the different width dimensions of the frame (121) of the hydrojet bogie assembly (120) according to the size of the water jet for testing, and a ledge is provided in the middle height area on which a sliding rail (132-3) can be installed.

In addition, a cradle pin (132-2) is connected to the sliding rail (132-3), thereby allowing sliding movement along the longitudinal direction of the sliding rail (132-3).

The cradle pin (132-2) protrudes toward the inside of the frame (131), and more precisely, the cradle pin bracket is connected to the sliding rail (132-3) and slides.

The cradle pin (132-2) is engaged with the pin block (125-2) discussed above to fix the hydrojet bogie assembly (120). At this time, this does not mean that the hydrojet bogie assembly (120) is completely fixed so that it cannot move, but rather that the hydrojet bogie assembly (120) slides along the sliding rail (132-3) while being engaged with the cradle pin (132-2).

A watertight cover (132-4) is attached to this base frame (132-1), and at this time, the internal space between the base frame (132-1) and the watertight cover (132-4) is filled with lubricating oil for lubricating the sliding movement of the cradle pin (132-2). For this purpose, an oil filler plug (132-8) is provided on the upper side of the watertight cover (132-4). In addition, a plurality of oil drain plugs (132-7) are provided on the lower side of the base frame (132-1) for draining the filled lubricating oil. At this time, an oil level check window (132-6) is provided on the watertight cover (132-4) so that the amount of lubricating oil filled inside can be recognized from the outside.

Meanwhile, the cradle pin (132-2) connected to the base frame (132-1) must protrude outside the watertight cover (132-4), and for this purpose, a pair of flexible covers (132-5) are provided on the watertight cover (132-4).

The flexible cover (132-5) is positioned corresponding to the protruding area of the cradle pin (132-2), and is made of a wrinkled rubber material, which serves to seal water so that water does not flow into the watertight cover (132-4) when the cradle pin (132-2) slides. At this time, since the flexible cover (132-5) itself is made of a flexible rubber material and has a number of wrinkles, even when the cradle pin (132-2) slides, stress is not generated on the flexible cover (132-5) itself.

All cradle pins (132-2) can slide independently of each other.

The load cell (133) measures the thrust of the test water jet inside the hydrojet bogie assembly (120) when the hydrojet bogie assembly (120) is pulled by the wire due to the load of the weight (128) discussed above, while in contact with the hydrojet bogie assembly (120). This load cell (133) basically means a pressure detection sensor, and when thrust is generated by the test water jet inside the hydrojet bogie assembly (120), the hydrojet bogie assembly (120) pushes the load cell (133) due to the repulsive force, and the load cell (133) can calculate the thrust of the test water jet based on this pushing pressure.

The pulley frame (134) is installed outside of the frame (131), and for this purpose, a separate mounting bracket may be provided on the outside of the frame (131). The pulley frame (134) is installed on this mounting bracket, and is provided so that the height can be adjusted so that the horizontal part of the wire pulling the frame (121) of the hydrojet bogie assembly (120) can be positioned at the center line of the load cell (133) installed on the frame (131).

A pulley (134a) is provided on the pulley frame (134) to which a wire connected to a weight (128) is hung. The pulley (134a) ensures that when the wire is pulled by the load of the weight (128), the force is completely applied as a force to pull the hydrojet bogie assembly (120). This has the advantage of being able to concentrate the force on the load cell (133) with a simpler structure in that separate equipment or device for forcibly pushing the hydrojet bogie assembly (120) toward the load cell (133) is unnecessary.

Using these weights (128), the water jet thrust test device is calibrated. Here, calibration means a process of obtaining data used for calculating the thrust value of the water jet by recording the measured signal values obtained by pushing the hydrojet bogie assembly (120) with a force known in advance and contacting the load cell (133) before the test water jet thrust test, and then converting the load cell (133) signal values measured during the water jet thrust test in reverse.

Looking at Fig. 13, the hydrojet bogie assembly (120) with the test waterjet installed is installed in the adapter frame assembly (130), and the height is adjusted so that the reference line of the measurement center of the load cell (133) and the nozzle center of the test waterjet are aligned with each other. Then, the wire is pulled by the load of the weight (128). At this time, the wire is hung on the shackle (127a) of the pulling frame assembly (127) while being hung on the pulley (134a).

Accordingly, as the wire is pulled by the load of the weight (128), the hydrojet bogie assembly (120) can be naturally brought into close contact with the load cell (133), and the load cell (133) outputs a signal value to be used for calibration.

Meanwhile, the calibration process of the water jet thrust test system (100) to which the load cell weight calibration method of the present invention is applied is as follows.

Figure 14 is a drawing comparing a conventional calibration method (a) for calibrating a load cell (133) signal value and a calibration method (b) according to the present invention.

First, the conventional calibration method of Fig. 14(a) is to connect a hydrojet carriage assembly (120) with a test waterjet installed to a fixed frame (129) so that it can move forward and backward, and a pulley frame (134) and a load cell (133) for pulling the hydrojet carriage assembly (120) are installed on the fixed frame (129) on the opposite side of the waterjet discharge portion, thereby calibrating the waterjet thrust test device.

When the calibration is completed, the hydrojet bogie assembly (120) and the load cell (133) are separated from the fixed frame (129) and transferred and combined to the bogie fixed frame assembly (140) fixed to the test position of the test tank (1) to perform the waterjet thrust test. Therefore, there was a problem that the accuracy of the test was reduced because the setting in which the calibration was performed and the setting environment in which the actual thrust test was performed were significantly different.

The calibration method of the present invention of Fig. 14(b) is such that a hydrojet bogie assembly (120) having a test waterjet installed is connected to an adapter frame assembly (130) so as to be able to move forward and backward, and a pulley frame (134) and a load cell (133) for pulling the hydrojet bogie assembly (120) on the opposite side of the waterjet discharge portion are each installed on the adapter frame assembly (130). The connected hydrojet bogie assembly (120) and adapter frame assembly (130) are supported on a fixing frame (135), and calibration of the waterjet thrust test device is performed.

When the calibration is completed, the pulling frame assembly (127), wire and weight (128) are separated from the hydrojet bogie assembly (120) so as not to interfere with the waterjet thrust test in the test tank (1), and the pulley frame (134) is separated from the adapter frame assembly (130). Then, the hydrojet bogie assembly (120) and the adapter frame assembly (130) are maintained in a combined state and transferred to and combined with the bogie fixing frame assembly (140) fixed to the test position in the test tank (1) to perform the waterjet thrust test. Therefore, since the setting in which the calibration was performed and the setting environment in which the actual thrust test is performed do not differ, the accuracy of the test is improved.

Figure 15 is a drawing showing the process of performing calibration by bringing the hydrojet bogie assembly (120) into close contact with the load cell (133) by the pulley frame (134) on land.

First, Fig. 15(a) shows a hydrojet carriage assembly (120) with a test waterjet installed, installed on an adapter frame assembly (130), and height adjustment completed so that the reference line of the measurement center of the load cell (133) and the nozzle center of the test waterjet are aligned with each other.

In this state, the pulley frame (134) is moved up and down the frame (131) so that the height of the wire connected to the shackle (127a) of the pulling frame assembly (127) is aligned with the reference line of the measurement center of the load cell (133). In the current state, the hydrojet bogie assembly (120) and the load cell (133) are not in close contact with each other due to a gap therebetween.

Next, as shown in Fig. 15(b), the hydrojet bogie assembly (120) is pulled by the tensile force acting on the wire due to the dead weight of the weight (128), and accordingly, the hydrojet bogie assembly (120) is brought into close contact with the load cell (133), and a signal value for correction is measured.

The bogie fixing frame assembly (140) moves along a rail (2) provided in the longitudinal direction of the test tank (1), and an adapter frame assembly (130) to which the hydrojet bogie assembly (120) discussed above is combined is installed. At this time, the height of the adapter frame assembly (130) is adjusted. This will be examined in more detail with reference to FIGS. 16 to 18.

FIG. 16 is a drawing showing the bogie fixing frame assembly (140) in more detail, FIG. 17 is a drawing showing a state in which an adapter frame assembly (130) to which a hydrojet bogie assembly (120) is coupled is installed on the bogie fixing frame assembly (140), and FIG. 18 is a drawing showing a state in which the hydrojet bogie assembly (120) coupled to the adapter frame assembly (130) by the bogie fixing frame assembly (140) is adjusted in height in the vertical direction above a test tank (1).

Referring to FIG. 16, the bogie fixed frame assembly (140) is configured to include a frame (141), one or more hydraulic cylinders (142), a hydraulic power pack (143), a track wheel (144), a bogie drive gearbox (145), and a junction box (146).

The frame (141) has an internal space provided to accommodate an adapter frame assembly (130) therein, and when the hinge pin of the adapter frame assembly (130) is coupled to the upper side of at least four hydraulic cylinders (142) installed in the frame (131), the adapter frame assembly (130) is raised or lowered in the vertical direction by the hydraulic pressure of the hydraulic cylinders (142).

This aspect can play a role in not only raising and lowering the adapter frame assembly (130) but also fixing the measurement position (adjusting the height of the water jet for testing, etc.), and especially, when separation of the water jet for testing within the hydrojet carriage assembly (120) is required, the adapter frame assembly (130) can be raised and lowered for easy separation without disassembling the entire equipment, which can have the advantage of making equipment maintenance very convenient.

One or more hydraulic cylinders (142) serve to raise or lower the adapter frame assembly (130) in the vertical direction, and at this time, hydraulic pressure is supplied from a hydraulic power pack (143).

The track wheel (144) rotates along the longitudinal direction of the rail (2) while being secured to the rail (2) to move the bogie fixed frame assembly (140), and the bogie drive gearbox (145) is a gearbox to which a hydraulic motor is applied and provides power to drive the track wheel (144). In addition, the junction box (146) serves as an intermediate device that connects the wiring of the electric devices (e.g., AC motor, solenoid valve, cooling fan, safety sensor, etc.) of the hydraulic power pack (143) to a control console, and includes an electric safety device, a manual control switch, an emergency stop switch, and an operation confirmation lamp.

Looking at Figure 18, Figure 18(a) shows a state where the adapter frame assembly (130) is moved out of the water of the test tank (1) using a hydraulic cylinder (142) when maintenance is required before, after, or during the water jet thrust test.

In addition, Fig. 18(b) shows a state in which the adapter frame assembly (130) is lowered to match the draft of the test water jet using a hydraulic cylinder (142) for a water jet thrust test.

Next, the entire process of conducting a thrust test of a test water jet using a water jet thrust test system (100) to which the load cell weight calibration method discussed above is applied will be examined in a sequential manner.

FIG. 19 is a drawing showing a process of conducting a thrust test of a test water jet using a water jet thrust test system (100) to which a load cell weight calibration method according to one embodiment of the present invention is applied.

Referring to Fig. 19, in order to calibrate the waterjet thrust test device, the hydrojet bogie assembly (120) on which the test waterjet is installed is placed inside the adapter frame assembly (130) on the fixed frame (135) using the hoist (111) of the gantry crane (110) (S101).

Next, the load cell (133) of the adapter frame assembly (130) is positioned and fixed to the frame (131) so that the center line of the load cell (133) is aligned with the center line of the water jet nozzle for testing (S102), and the pulley frame (134) is positioned so that the height of the wire connected to the shackle (127a) of the pulling frame assembly (127) is aligned with the center line of the water jet nozzle so that the point of application of the force that pulls the frame (121) by the wire connected to the weight (128) is on the same line as when the force is applied due to the water jet discharge, and the water jet thrust test device is calibrated (S103).

After the calibration of the waterjet thrust test device is completed, the pulling frame assembly (127), wire and weight (128) are separated from the hydrojet bogie assembly (120) to avoid interference during the waterjet thrust test, and the pulley frame (134) is separated from the adapter frame assembly (130) (S104).

The hydrojet bogie assembly (120) and the adapter frame assembly (130) are installed inside the bogie fixed frame assembly (140) fixed to the test position of the test water tank (1) using the hoist (111) of the gantry crane (110), and the hydrojet bogie assembly (120) and the adapter frame assembly (130) are lowered and then fixed so that the test water jet can be set to the test position (S105).

After the engine bogie (150) is moved in a straight line toward the hydrojet bogie assembly (120), the output shaft of the engine and the hydrojet bogie assembly (120) are connected, and the thrust of the test waterjet is generated through the rotational power of the engine (S106), and the thrust generated by the test waterjet is measured through the load cell (133) included in the adapter frame assembly (130) (S107).

Although the present invention has been described above with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various modifications and changes may be made to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below.

1: Test tank
2: Rail
100: Waterjet thrust test system with load cell weight correction method
110: Gantry crane
111: Hoist
120: Hydrojet bogie assembly
121: Frame
122: Conversion adapter
123: Torque Meter
124: Pulley Box
125: Pinblock bracket device
125-1: Pin Block Bracket
125-1a: Horizontal pin block bracket
125-1b: Vertical pin block bracket
125-2: Pin Block
125-3: Height adjustment means
125-4: Laser sensor for height adjustment
126: Lifting hook
127: Polling Frame Assembly
127a: Shackle
128: Weight
129: Fixed Frame
130: Adapter Frame Assembly
131: Frame
132: LM assembly
132-1: Base Frame
132-2: Cradle Pin
132-3: Sliding rail
132-4: Watertight cover
132-5: Flexible cover
132-6: Oil level check window
132-7: Oil drain plug
132-8: Oil filler plug
133: Load cell
134: Pulley Frame
134a: Pulley
135: Fixed Frame
140: Bogie fixing frame assembly
141: Frame
142: Hydraulic cylinder
143: Hydraulic Power Pack
144: Track Wheel
145: Bogie Drive Gearbox
146: Junction Box
150: Engine bogie

Claims (10)

A gantry crane (110) installed along the longitudinal direction on the upper side of the test tank (1);
A hydrojet bogie assembly (120) on which a test waterjet is installed;
An adapter frame assembly (130) on which the above hydrojet bogie assembly (120) is installed;
A cart fixing frame assembly (140) provided so as to be able to move along a rail (2) provided in the longitudinal direction of the test tank (1) and on which the adapter frame assembly (130) is installed, but the height of the adapter frame assembly (130) can be adjusted; and
It includes an engine carriage (150) which is arranged to be able to move along the above rail (2) and has an engine mounted thereon, which is coupled to a test water jet;
By means of the weight provided on the hydrojet bogie assembly (120), the hydrojet bogie assembly (120) is closely fixed to the load cell provided on the adapter frame assembly (130).
The above hydrojet bogie assembly (120) is
A frame (121) having an internal space formed to accommodate a test water jet;
A conversion adapter (122) installed and fixed to the above frame (121) and having different shapes depending on the size of the test water jet, on which the test water jet is mounted;
A torque meter (123) which is connected at one end to the output shaft of the test water jet and measures the torque applied to the output shaft of the test water jet;
A pulley box (124) which has one end connected to the torque meter (123) and the other end connected to the output shaft of the engine mounted on the engine bogie (150), and which converts and transmits the rotational power of the engine to correspond to the rotational speed range of the test water jet;
A pin block bracket device (125) provided on the outside of the above frame (121) and configured to allow for height adjustment in the up-down direction;
A pulling frame assembly (127) installed on the above frame (121); and
A water jet thrust test system having a load cell weight correction method, characterized in that it includes a weight (128) connected to the pulling frame assembly (127) through a wire.
In the first paragraph,
The above gantry crane (110) is
A waterjet thrust test system to which a load cell weight correction method is applied, characterized by including a hoist (111) connected to the hydrojet bogie assembly (120) and the adapter frame assembly (130).
delete In the first paragraph,
The above pulley box (124) is
A waterjet thrust test system having a load cell weight correction method applied, characterized in that it includes a pulley connected to the output shaft of an engine and a pulley connected to the output shaft of a test waterjet.
In the first paragraph,
The above pin block bracket device (125) is
Pin block bracket (125-1) installed in the longitudinal direction on both sides of the above frame (121);
A plurality of pin blocks (125-2) provided on the above pin block bracket (125-1) and fixed to the adapter frame assembly (130) by interlocking in the vertical direction;
A height adjustment means (125-3) which is rotatably connected to the frame (121) at the upper side and vertically penetrates the pin block bracket (125-1) at the lower side, and is screw-connected to the pin block bracket (125-1) through screw threads formed along the outer surface; and
A water jet thrust test system to which a load cell weight correction method is applied, characterized by including a plurality of height-adjusting laser sensors (125-4) provided on the upper side of each of the plurality of pin blocks (125-2) and measuring the real-time height of the pin block bracket (125-1) by irradiating each pin block (125-2) with a laser.
In paragraph 5,
The above adapter frame assembly (130) is
A frame (131) having an internal space formed to accommodate the above frame (121);
A pair of LM assemblies (132) that are arranged to face each other on both sides of the above frame (131) and are interlocked and combined by the pin block (125-2) to fix the hydrojet bogie assembly (120);
A load cell (133) provided on the inside of the above frame (131) and measuring the thrust generated by the test water jet while in contact with one side of the received frame (121); and
A water jet thrust test system to which a load cell weight correction method is applied, characterized by including a pulley frame (134) which is installed on the outside of the frame (131) and includes a pulley (134a) on which a wire connected to the pulling frame assembly (127) is hung, and which supports the weight (128) connected to the wire so that a load is applied in a downward direction.
In Article 6,
The above LM assembly (132) is
A base frame (132-1) that is supported on a frame (131) and slides to adjust the protrusion length to match the width of the frame (121) of the hydrojet bogie assembly (120);
A cradle pin (132-2) provided on the base frame (132-1), interlocked with the pin block (125-2) and fixed in a state of protruding toward the inside of the frame (131), and provided so as to be able to slide in the longitudinal direction of the base frame (132-1);
A sliding rail (132-3) installed on the above base frame (132-1) and guiding the sliding movement of the cradle pin (132-2);
A watertight cover (132-4) covering the above base frame (132-1);
A flexible cover (132-5) provided on the above watertight cover (132-4);
Oil level check window (132-6) provided in the above watertight cover (132-4);
An oil drain plug (132-7) provided on the above base frame (132-1); and
It includes an oil filler plug (132-8) provided in the above watertight cover (132-4);
A water jet thrust test system to which a load cell weight correction method is applied, characterized in that the cradle pin (132-2) protrudes outwardly through the flexible cover (132-5), and the space between the base frame (132-1) and the watertight cover (132-4) is filled with lubricating oil for lubricating the horizontal movement of the cradle pin (132-2).
In Article 6,
A water jet thrust test system with a load cell weight correction method applied, characterized in that the frame (121) is brought into close contact with the load cell (133) as the wire is pulled by the load of the weight (128) while being hung on the pulley (134a).
In the first paragraph,
The above-mentioned bogie fixing frame assembly (140) is
Frame (141);
One or more hydraulic cylinders (142) for raising or lowering the above adapter frame assembly (130) in the vertical direction;
A hydraulic power pack (143) that provides hydraulic pressure to the above hydraulic cylinder (142) and the adapter frame assembly (130);
A track wheel (144) provided at the lower part of the above frame (141) and rotating along the rail (2);
A bogie drive gearbox (145) driving the above track wheel (144); and
A water jet thrust test system to which a load cell weight correction method is applied, characterized by including a junction box (146) electrically connected to the above hydraulic power pack (143).
A step of installing a hydrojet bogie assembly (120) with a test waterjet installed inside an adapter frame assembly (130) on a fixed frame (135) on land using a hoist (111) of a gantry crane (110);
A step of positioning and fixing the load cell (133) to the frame (131) so that the center line of the load cell (133) of the adapter frame assembly (130) is aligned with the center line of the water jet nozzle for testing;
A step of positioning the pulley frame (134) so that the horizontal part of the wire connected to the weight (128) is aligned with the center line of the waterjet nozzle and performing calibration of the waterjet thrust test device;
Step of separating the pulling frame assembly (127), wire and weight (128) from the hydrojet bogie assembly (120) and the pulley frame (134) from the adapter frame assembly (130) to avoid interference during the waterjet thrust test after correction;
A step of lowering the hydrojet bogie assembly (120) and the adapter frame assembly (130) to the waterjet test position and then fixing them inside the bogie fixed frame assembly (140) fixed to the test position of the test tank (1) using a gantry crane (110);
A step of moving the engine bogie (150) in a straight line toward the hydrojet bogie assembly (120), connecting the output shaft of the engine and the hydrojet bogie assembly (120), and generating thrust of a test water jet through the rotational power of the engine; and
A waterjet thrust test method using a waterjet thrust test system to which a load cell weight correction method is applied, characterized in that it includes a step of measuring thrust generated by a test waterjet through a load cell included in the above adapter frame assembly (130).