KR102797509B1 - Water jet thrust test system to which hydraulic calibration method of 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 of completed setting into a tank, and in particular, to a load cell hydraulic correction method that uses the hydraulic pressure of a ram cylinder to push the waterjet toward a load cell so that the thrust is concentrated entirely on the load cell.

Description

{WATER JET THRUST TEST SYSTEM TO WHICH HYDRAULIC CALIBRATION METHOD OF 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 hydraulic 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 hydraulic 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 tank, and in particular, to a waterjet thrust test system to which a load cell hydraulic 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 pushing and pressing the waterjet in the direction of a load cell using the hydraulic pressure of a ram cylinder.

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 thrust tests by using waterjets of various sizes interchangeably, 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 hydraulic correction method is applied by using the hydraulic pressure of a ram cylinder to push the waterjet toward a load cell so that the thrust is concentrated entirely on the load cell.

A waterjet thrust test system to which a load cell hydraulic 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) is adjustable, and an engine bogie (150) that is provided to be movable along the rail (2) and on which an engine coupled to the test waterjet is installed, and by hydraulic pressure generated in the adapter frame assembly (130), the hydrojet bogie assembly (120) is fixed to the adapter frame assembly (130). It can be tightly fixed to the provided load cell.

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) may include a frame (121) having an internal space formed to accommodate 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, and a pin block bracket device (125) provided on the outside of the frame (121) and configured to be height-adjustable in the vertical direction.

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 a base 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 an 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 provided to face each other on both sides of the frame (131) and are interlocked and connected by the pin block (125-2) so that the hydrojet bogie assembly (120) is fixed, a load cell (133) that is provided 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 received frame (121), and a ram bracket assembly (134) that is provided on the inside of the frame (131) at a position facing the load cell (133) and pushes the received frame (121) toward the load cell (133) through hydraulic pressure so as to be in close contact.

In one embodiment, the LM assembly (132) comprises: a base frame (132-1) that is supported on a frame (131) so as to correspond to the width of the frame (121) of the hydrojet bogie assembly (120) and is slidable so as to have an adjustable protrusion length; a cradle pin (132-2) that is provided on the base frame (132-1) and is fixed by engaging with the pin block (125-2) in a state of protruding toward the inside of the frame (131) and is provided so as 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, the ram bracket assembly (134) comprises a push frame (134-1), a base frame (134-2) connected to the push frame (134-1) while being fixed to the frame (131), a ram cylinder (134-3) connected to the push frame (134-1) and sliding the push frame (134-1) forward and backward in the direction of hydraulic pressure, a hydraulic cylinder (134-4) for vertical movement connected to the upper side of the base frame (134-2) and sliding the base frame (134-2) up and down in the direction of hydraulic pressure, a guide rod (134-5) connected to the frame (131) by vertically penetrating the base frame (134-2) and guiding the vertical sliding movement of the base frame (134-2), a position adjustment sensor (134-6) provided on the frame (131) and a position adjustment sensor (134-6) provided on the base frame (134-2). It may include a laser reflector (134-7) that reflects laser light irradiated by the position adjustment sensor (134-6).

In one embodiment, the base frame (134-2) can be connected to the push frame (134-1) through a plurality of linear guide blocks (134-2a) and linear guide rails (134-2b).

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 a 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 hydraulic correction method according to another embodiment of the present invention is applied comprises the steps of: installing a load cell (133) and a ram bracket assembly (134) on land so that their centers are positioned on the same line so as to face each other in an adapter frame assembly (130); positioning the hydrojet bogie assembly (120) inside the adapter frame assembly (130) so that the center of a test waterjet nozzle in the hydrojet bogie assembly (120) is positioned on the same line as the load cell (133); a correction step of applying hydraulic pressure to the ram bracket assembly (134) step by step to obtain a load cell (133) signal output according to the force that brings the hydrojet bogie assembly (120) into close contact with the load cell (133); and, after the correction, moving the ram bracket assembly (134) to the upper part of the frame (131) so as not to interfere with the waterjet spraying. The method may include a step of lowering a hydrojet bogie assembly (120) and an adapter frame assembly (130) to a waterjet test position and then fixing them inside a bogie fixing frame assembly (140) that is fixed to a test position of a test tank (1) using a gantry crane (110), a step of moving an engine bogie (150) in a straight line toward the hydrojet bogie assembly (120), connecting an output shaft of an engine and the hydrojet bogie assembly (120), and generating thrust of a test waterjet through the rotational power of the engine, and a step of measuring 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 using the hydraulic pressure of the ram cylinder to strongly press the water jet toward the load cell and support the repulsive force, it has the advantage of being able to concentrate the thrust entirely 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 hydraulic correction 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) is slid inwardly on both sides of the frame (131) to match the width of the frame (121) of the hydrojet bogie assembly (120) 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 the lamb bracket assembly (134) in more detail.
Figure 13 is a drawing showing a state in which a push frame (134-1) applies a pushing force to a frame (121) by a ram cylinder (134-3).
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 attaching the hydrojet bogie assembly (120) to the load cell (133) by the ram bracket assembly (134) on land.
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 on 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 hydraulic correction 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 hydraulic correction method according to one embodiment of the present invention is applied.

A waterjet thrust test system (100) to which a load cell hydraulic 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), and a lifting ring (126).

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

The frame (121) basically has a rectangular prism shape with an internal space, but has a region (A) with one side protruding in a T shape. The region (A) is an area that receives a force pushed by the hydraulic pressure of the ram cylinder (134-3) by being in close contact with the push frame (134-1) of the ram bracket assembly (134) described later. The force transmitted in this way serves to push the frame (121) itself, and at this time, a load cell (133), which is a thrust measuring sensor, can be positioned in the direction of the pushing.

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.

At this time, the area of the flat area varies depending on the size of the test waterjet, as shown in Fig. 6. That is, when a large or medium-sized waterjet is mounted, a wider groove is formed in the flat area, as shown in Fig. 6(a), and when a small waterjet is mounted, a narrow groove is formed in the flat area, as shown in Fig. 6(b).

These conversion adapters (122) are not provided separately for each type of test waterjet, but can be provided in multiples for specific sizes, such as large, medium, and small. Accordingly, if the size of the test waterjet is large, it can be mounted on a large conversion adapter (122) and fixed to the frame (121), and if it is small, it can be mounted on a small conversion adapter (122) and mounted on the frame (121).

At this time, 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 in 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 end connected to the torque meter (123) and the other end 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.

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 frame (121) of the hydrojet bogie assembly (120) 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), and FIG. 12 is a drawing showing the ram bracket assembly (134) in more detail, FIG. 13 is a drawing showing a state in which the ram cylinder (134-3) pushes and engages the ram bracket assembly (134). This is a drawing showing a state in which a frame (134-1) applies a force to a frame (121).

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 ram bracket assembly (134).

First, the frame (131) corresponds to an 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) is provided in an area facing the ram bracket assembly (134) described later among the inner surfaces of the frame (131), and when the hydrojet bogie assembly (120) installed in the frame (131) is pushed by the ram bracket assembly (134), it measures the thrust of the test waterjet inside the hydrojet bogie assembly (120) 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 waterjet inside the hydrojet bogie assembly (120), the hydrojet bogie assembly (120) pushes the load cell (133) due to the repulsive force thereto, and the load cell (133) can calculate the thrust of the test waterjet based on this pushing pressure.

The ram bracket assembly (134) is located in an area facing the load cell (133) on the inner side of the frame (131), and uses hydraulic pressure to push the hydrojet bogie assembly (120) toward the load cell (133), thereby performing alignment between the hydrojet bogie assembly (120) and the load cell (133).

Here, calibration means a process of obtaining data used for calculating the thrust value of a water jet by recording the measured signal values obtained by pushing the hydrojet bogie assembly (120) with a force known in advance and bringing it into close contact with the load cell (133) before the thrust test and then converting the load cell (133) signal values measured during the water jet thrust test in reverse.

This ram bracket assembly (134) is composed of a push frame (134-1), a base frame (134-2), a ram cylinder (134-3), a hydraulic cylinder (134-4), a guide rod (134-5), a position adjustment sensor (134-6), and a laser reflector (134-7).

The push frame (134-1) is provided with a push guide bracket (134-1a) for pushing the hydrojet bogie assembly (120) toward the load cell (133) facing the ends on both sides. The push frame (134-1) is provided so as to be able to slide in the forward and backward direction (toward or away from the hydrojet bogie assembly (120)) while connected to the base frame (134-2). At this time, since the push frame (134-1) is connected to the ram cylinder (134-3) at the rear, it can move forward or backward through the hydraulic pressure of the ram cylinder (134-3), and when the push frame (134-1) moves forward, the hydrojet bogie assembly (120) is pushed and comes into close contact with the load cell (133).

This push frame (134-1) is connected to the base frame (134-2) through a plurality of linear guide blocks (134-2a) and linear guide rails (134-2b) provided on the base frame (134-2), and the sagging of the push frame (134-1) is prevented and friction is also reduced by the linear guide blocks (134-2a) and linear guide rails (134-2b).

Meanwhile, a hydraulic cylinder (134-4) for vertical movement is provided on the upper side of the base frame (134-2) to slide the base frame (134-2) up and down, and at this time, two guide rods (134-5) penetrating the base frame (134-2) in the vertical direction are provided. The guide rods (134-5) penetrate the base frame (134-2) in the vertical direction and are fixed to the frame (131), and guide the base frame (134-2) when it moves up and down by the hydraulic cylinder (134-4) for vertical movement. At this time, the hydraulic cylinder (134-4) for vertical movement is connected to a hinge pin provided on the upper side of the base frame (134-2).

In addition, a position adjustment sensor (134-6) is provided in the frame (131), and by irradiating laser light to a laser reflector (134-7) provided in the base frame (134-2), the real-time height of the base frame (134-2) is calculated based on the reflected laser light. In particular, the position adjustment sensor (134-6) enables the position of the push frame (134-1) to be positioned at the center of the nozzle of the test water jet.

Meanwhile, the calibration process of the water jet thrust test system (100) to which the load cell hydraulic calibration method according to 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 such that the hydrojet bogie assembly (120) having the test waterjet installed is connected to the fixed frame (127) so that it can move forward and backward, and a ram bracket assembly (134) for pushing the hydrojet bogie assembly (120) on the waterjet discharge side and a load cell (133) are installed on the opposite side of the fixed frame (127), 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 (127) and transferred and connected 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 environment in which the calibration was performed and the setting environment in which the actual thrust test is performed were significantly different.

The calibration method of the present invention of Fig. 14(b) is such that a hydrojet cart 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 ram bracket assembly (134) for pushing the hydrojet cart assembly (120) on the waterjet discharge side and a load cell (133) on the opposite side are each installed on a frame (131). The connected hydrojet cart assembly (120) and adapter frame assembly (130) are supported on a fixing frame (127) to calibrate the waterjet thrust test device.

When the calibration is completed, the hydrojet bogie assembly (120) and the adapter frame assembly (130) are maintained in a combined state 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, 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 attaching the hydrojet bogie assembly (120) to the load cell (133) by the ram bracket assembly (134) on land.

First, Fig. 15(a) shows a state in which a hydrojet carriage assembly (120) with a test waterjet installed is installed on an 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 center of the nozzle and ram bracket assembly (134) of the test waterjet are all aligned.

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 between them.

Next, as shown in Fig. 15(b), the push frame (134-1) moves forward by the hydraulic pressure generated through the ram cylinder (134-3) to push the hydrojet bogie assembly (120), 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 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 on 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).

Hydraulic pressure generated from the hydraulic power pack (143) can be supplied to the ram cylinder (134-3) of the ram bracket assembly (134) discussed above as well as the hydraulic cylinder for vertical movement (134-4).

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 previously discussed load cell hydraulic correction method 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 hydraulic correction method according to one embodiment of the present invention is applied.

Referring to Figure 19, in order to calibrate the water jet thrust test device on land, the center lines of the load cell (133) and the ram bracket assembly (134) are aligned and fixed facing each other inside the adapter frame assembly (130) on the fixing frame (135) (S101).

Next, the hydrojet bogie assembly (120) is installed so that the nozzle center line of the test waterjet of the hydrojet bogie assembly (120) is aligned with the center line of the load cell (133) of the adapter frame assembly (130) (S102), and hydraulic pressure is applied to the ram bracket assembly (134) in stages to calibrate the waterjet thrust test device (S103).

After the calibration of the waterjet thrust test device is completed, the ram bracket assembly (134) is moved to the upper part of the frame (131) so as not to interfere with the water jet ejected during the waterjet thrust test (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 hydraulic 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: 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: Ram bracket assembly
134-1: Push Frame
134-1a: Push Guide Bracket
134-2: Base Frame
134-2a: Direct acting guide block
134-2b: Linear guide rail
134-3: Ram Cylinder
134-4: Hydraulic Cylinder
134-5: Guide Rod
134-6: Position adjustment sensor
134-7: Laser Reflector
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 (11)

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 the hydraulic pressure generated in the above adapter frame assembly (130), the hydrojet bogie assembly (120) is tightly fixed to the load cell provided in the above 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 is connected to the torque meter (123) on one side and the output shaft of the engine mounted on the engine bogie (150) on the other side, and which converts and transmits the rotational power of the engine to correspond to the rotational speed range of the test water jet; and
A water jet thrust test system to which a load cell hydraulic correction method is applied, characterized by including 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.
In the first paragraph,
The above gantry crane (110) is
A waterjet thrust test system to which a load cell hydraulic correction method is applied, characterized by including a hoist (111) connected to the above hydrojet bogie assembly (120) and adapter frame assembly (130).
delete In the first paragraph,
The above pulley box (124) is
A waterjet thrust test system with a load cell hydraulic correction method, 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 hydraulic 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 hydraulic correction method is applied, characterized by including a ram bracket assembly (134) which is provided at a position facing the load cell (133) on the inside of the frame (131) and pushes the received frame (121) toward the load cell (133) through hydraulic pressure so that it is pressed against it.
In Article 6,
The above LM assembly (132) is
A base frame (132-1) that is supported on a frame (131) and slides so that the protrusion length can be adjusted to correspond to 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 in which it protrudes toward the inside of the frame (131), and is 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 hydraulic 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,
The above ram bracket assembly (134) is
Push frame (134-1);
A base frame (134-2) connected to the push frame (134-1) while fixed to the above frame (131);
A ram cylinder (134-3) connected to the above push frame (134-1) and slidingly moving the push frame (134-1) in the forward and backward direction through hydraulic pressure;
A hydraulic cylinder (134-4) for vertical movement, which is connected to the upper side of the base frame (134-2) and slides the base frame (134-2) up and down through hydraulic pressure;
A guide rod (134-5) that penetrates the base frame (134-2) in the vertical direction and is connected to the frame (131) and guides the vertical sliding movement of the base frame (134-2);
A position adjustment sensor (134-6) provided on the above frame (131); and
A water jet thrust test system to which a load cell hydraulic correction method is applied, characterized by including a laser reflector (134-7) provided on the base frame (134-2) and configured to reflect laser light irradiated by the position adjustment sensor (134-6).
In Article 8,
The above base frame (134-2) is
A water jet thrust test system with a load cell hydraulic correction method, characterized in that it is connected to the push frame (134-1) through a plurality of linear guide blocks (134-2a) and linear guide rails (134-2b).
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 hydraulic correction method is applied, characterized by including a junction box (146) electrically connected to the above hydraulic power pack (143).
A step of installing the load cell (133) and the ram bracket assembly (134) on land so that their centers are positioned on the same line and facing each other in the adapter frame assembly (130);
A step of positioning the hydrojet bogie assembly (120) inside the adapter frame assembly (130) so that the center of the test water jet nozzle in the hydrojet bogie assembly (120) is located on the same line as the load cell (133);
A calibration step of obtaining a load cell (133) signal output according to the force of applying hydraulic pressure stepwise to the above-mentioned ram bracket assembly (134) to bring the hydrojet bogie assembly (120) into close contact with the load cell (133);
Step of moving the above-mentioned ram bracket assembly (134) to the upper part of the frame (131) after correction so that it does not interfere with the water jet spraying;
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 hydraulic 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).