Analog test method for load measuring arms

Abstract

This invention relates to a simulation test method for a load measuring arm, comprising the following steps: Step 1, modification of the upper plate; Step 2, modification of the lower plate; Step 3, addition of a turning lug; Step 4, turning the lower plate; Step 5, installation of the column; Step 6, installation of the upper plate; Step 7, installation of the measuring unit; Step 8, zero-position adjustment; Step 9, load testing; Step 10, unloading of the measuring unit. This invention modifies the load measuring arm into a simulated fixture, which is placed on the ground. A hydraulic jack is used to simulate the force exerted by a ship on the load measuring arm. Based on the relationship between the load and displacement of the simulated fixture, the load strength borne by the load measuring arm is evaluated. Compared to the existing technology of testing on a ship hull, this method offers higher safety, less influence from external factors during the entire testing process, and higher testing accuracy.

Description

Technical Field

[0001] This invention relates to the field of marine engineering vessel technology, and in particular to a simulation test method for a load measuring arm. Background Technology

[0002] When launching newly built or repaired platforms and vessels on land, a transfer system is needed to move them from the land to a launching barge. The launching barge then transports them to a suitable water area, where it submerges to a certain depth to complete the launching process. During the transfer from land to the launching barge, the load on the barge is constantly changing, which may cause the vessel to tilt. A load measuring arm is an essential piece of equipment for launching barges. When installed on newly built platforms or vessels, the load measuring arm's force-measuring unit measures the load on the launching barge's sides. Combined with the four-corner draft gauges, the loading of the ballast tanks is adjusted to ensure the main deck of the launching barge is level with the dock. Before use, the load measuring arm's strength must be tested to ensure it meets the load requirements.

[0003] Chinese invention patent CN113418568A discloses a load measurement feedback device and method for launching barges. The load measurement feedback device includes a mounting bracket and a hydraulic component mounted on the mounting bracket. By mounting the bracket on the dock surface, the hydraulic component contacts the lower plane of the load arm extending over the barge to measure the load and feeds the measurement data back to the barge's hull control system. This method can monitor the changes in the load on the launching barge in real time during the transfer process and convert the measured data into an electrical signal for transmission to the barge's hull control system.

[0004] However, the above-mentioned methods for testing the load strength of load measuring arms still have some drawbacks. Testing load measuring arms on launched barges involves significant forces on the hull, numerous uncertainties, and substantial safety hazards. Furthermore, the floating of the hull can easily affect the test results, impacting their accuracy. Therefore, this invention proposes a simulation testing method for load measuring arms to address these problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a simulation test method for a load measuring arm that is highly safe and has high test accuracy.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is: a simulation test method for a load measuring arm, the innovation of which is that the simulation test method includes the following steps:

[0007] Step 1: Modify the upper body by welding a box girder structure to the middle of the bottom surface of the upper body;

[0008] Step 2: Modify the lower piece. Remove excess components from the top surface of the lower piece, maintain the flatness of the top surface of the lower piece, add a pad beam on each of the two sides in the width direction of the lower piece, and add a reinforcing rib on the lower piece between the two pad beams.

[0009] Step 3: Add turning lugs by welding three sets of turning lugs to the reinforcing ribs on the lower body.

[0010] Step 4: Turn the lower piece over. Connect the hook of the gantry crane to the turning lug, lift the lower piece over, and place it flat on the ground with the top surface facing down.

[0011] Step 5: Install the columns and weld the columns on both sides of the top of the lower body.

[0012] Step 6: Install the upper piece. Use a gantry crane to lift the upper piece to the top of the column, weld the upper piece to the column, and padded the bottom of the lower piece with pads to form a simulated tooling.

[0013] Step 7: Measurement unit installation. Use a gantry crane to lift the measurement unit to the vicinity of the simulation fixture, and then use a forklift to lift the measurement unit onto the platform formed by the lower plate and the pad beam. Install hydraulic jacks on the measurement unit and install pressure sensors on the hydraulic jacks. Adjust the level of the hydraulic jacks and pressure sensors to prevent lateral torque. Use clamps to reinforce the measurement unit.

[0014] Step 8: Zero-position adjustment. Pressurize the hydraulic jack and observe the pressure sensor reading. Stop pressurizing when the reading reaches the required value. Use the station position instrument to calibrate the zero-position height.

[0015] Step 9: Load test. Apply pressure to the hydraulic cylinder of the measuring unit at different stages according to the load arm test procedure, track the displacement distance of the hydraulic cylinder piston rod, and record the data.

[0016] Step 10: Unload the measurement unit.

[0017] Furthermore, the upper body is composed of a main crossbeam and two legs. The main crossbeam is horizontally arranged, and the two legs are welded to the bottom sides of the main crossbeam respectively, forming an inverted U-shaped structure with the main crossbeam. The legs are composed of a support column and a foot plate. The support column is vertically welded to the bottom surface of the main crossbeam, and the foot plate is horizontally welded to the bottom of the support column and perpendicular to the main crossbeam. The foot plate and the support column form an inverted T-shaped structure.

[0018] The structure of the lower sheet is the same as that of the upper sheet.

[0019] Furthermore, in step 3, the three sets of turning lugs are the first set of turning lugs, the second set of turning lugs, and the third set of turning lugs. The first set of turning lugs is welded to the top surface of the main crossbeam of the lower body on the side near the outrigger. The second set of turning lugs is welded to the side of the main crossbeam of the lower body away from the first set of turning lugs. The third set of turning lugs is welded to the inside of the foot plate of the outrigger of the lower body near the first set of turning lugs.

[0020] Step 4, the turning-over operation includes the following steps:

[0021] Step 4-1: The main hook of the gantry crane is connected to the second set of turning lugs using a wire rope, and the auxiliary hook of the gantry crane is connected to the first set of turning lugs using a wire rope.

[0022] Step 4-2: The main hook and auxiliary hook of the gantry crane rise simultaneously. After the lower piece is lifted away from the ground, observe and determine whether there is any uneven weight distribution or uneven tension on the wire rope. After confirming that there are no problems, proceed to the next step.

[0023] Step 4-3: The main hook of the gantry crane continues to lift, and the auxiliary hook of the gantry crane is lowered, so that the lower plate is turned over to a vertical position. The lower plate is then placed on sleepers at the bottom and left to stand still.

[0024] Step 4-4: The main hook of the gantry crane is not released, the auxiliary hook of the gantry crane is released and the third set of turning lugs is reconnected using wire rope;

[0025] Steps 4-5: The auxiliary hook of the gantry crane is raised, and the main hook of the gantry crane is lowered, so that the lower body is flipped over and placed flat on the ground.

[0026] Furthermore, in step 8, the required value is 20T.

[0027] Furthermore, in step 9, the load arm test procedure includes the following steps:

[0028] Step 9-1: Apply pressure to the hydraulic cylinder of the measuring unit, record the displacement of the hydraulic cylinder piston rod at 4 positions within the given range, read the corresponding pressure sensor readings, record the load of the simulated tooling, and observe whether the simulated tooling is normal.

[0029] Step 9-2: Compare the measured load value of the load measuring arm with the theoretical value. The deviation is within ±10% to be considered qualified.

[0030] Furthermore, in step 9-1, the displacement of the hydraulic cylinder piston rod is X, and the four positions are respectively within the range of hydraulic cylinder piston rod displacement 60mm≤X<100mm, 100mm≤X<140mm, 140mm≤X<180mm, and 180mm≤X<220mm.

[0031] Furthermore, the measuring unit includes a mounting bracket and a hydraulic cylinder. The hydraulic cylinder is mounted on the mounting bracket, and a guide post is coaxially mounted on the top of the piston rod of the hydraulic cylinder. The mounting bracket has a through hole for the guide post to pass through and move up and down. The guide post is movably disposed in the through hole.

[0032] The advantages of this invention are:

[0033] (1) The present invention transforms the load measuring arm into a simulated tooling. The simulated tooling is placed on the ground, and the hydraulic jack is used to simulate the force exerted by the ship on the load measuring arm. Based on the relationship between the load and displacement of the simulated tooling, the load strength of the load measuring arm is evaluated. Compared with the existing technology of testing on the ship hull, it is safer, the external factors have less influence on the entire testing process, and the testing accuracy is higher.

[0034] (2) The upper and lower body of the present invention are both composed of a main crossbeam and two legs. The two legs cooperate with the main crossbeam to form an inverted U-shaped structure. The legs are composed of a support column and a foot plate. The foot plate cooperates with the support column to form an inverted T-shaped structure. During the modification of the upper and lower body, the structure can stand stably on the ground, which is convenient for operators to carry out construction work and has high safety.

[0035] (3) In this invention, three sets of turning lugs welded on the lower plate are used to cooperate with the main hook and auxiliary hook of the gantry crane to complete the turning operation of the lower plate. The whole process is convenient to operate and has high safety. Attached Figure Description

[0036] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0037] Figure 1 This is a side view of the upper body in this invention.

[0038] Figure 2 This is a front view of the upper body of the present invention.

[0039] Figure 3 This is a top view of the upper body of the present invention.

[0040] Figure 4 This is a front view of the lower body of the present invention.

[0041] Figure 5 This is a top view of the lower body of the present invention.

[0042] Figure 6 This is a front view showing the positions of the three sets of turning lugs on the lower body of the present invention.

[0043] Figure 7 This is a top view showing the positions of the three sets of turning lugs on the lower body of the present invention.

[0044] Figure 8 This is a schematic diagram of the flipping operation of the lower piece of the present invention.

[0045] Figure 9 This is a front view of the simulation tooling of the present invention.

[0046] Figure 10 This is a side view of the simulation tooling of the present invention.

[0047] Figure 11 This is a schematic diagram showing the positions of the measuring unit and the simulation tooling of the present invention.

[0048] Figure 12 This is a side view of the measuring unit and simulation fixture of the present invention. Detailed Implementation

[0049] The following embodiments are intended to enable those skilled in the art to more fully understand the present invention, but do not limit the invention to the scope of the embodiments described.

[0050] The present invention provides a simulation test method for a load measuring arm, comprising the following steps:

[0051] Step 1: Modify the upper body. Weld a box girder structure 104 to the middle of the bottom surface of the upper body 1. The upper body 1 consists of a main crossbeam 101 and two legs. The main crossbeam 101 is horizontally set. The two legs are welded to both sides of the bottom long axis of the main crossbeam 101 and form an inverted U-shaped structure with the main crossbeam 101. The legs consist of a support column 102 and a foot plate 103. The support column 102 is vertically welded to the bottom surface of the main crossbeam 101. The foot plate 103 is horizontally welded to the bottom of the support column 102 and is perpendicular to the main crossbeam 101. The foot plate 103 and the support column 102 form an inverted T-shaped structure. The box girder structure 104 is welded to the middle of the bottom surface of the main crossbeam 101. The long axis of the box girder structure 104 is perpendicular to the long axis of the main crossbeam.

[0052] Step 2: Modify the lower piece. The structure of the lower piece 2 is the same as that of the upper piece 1. Remove the excess components on the top surface of the main crossbeam of the lower piece 2, keep the top surface of the lower piece 2 flat, add a pad beam 201 to the middle of each of the two sides of the main crossbeam of the lower piece 2 in the width direction, and add a reinforcing rib plate 202 to the lower piece between the two pad beams 201.

[0053] Step 3: Add turning lugs. Weld three sets of turning lugs to the ribs on the lower body 2. Each set of turning lugs has two turning lugs arranged side by side. The three sets of turning lugs are the first set of turning lugs 203, the second set of turning lugs 204, and the third set of turning lugs 205. The first set of turning lugs 203 is welded to the top surface of the main crossbeam of the lower body 2 on the side close to the outrigger. The second set of turning lugs 204 is welded to the side of the main crossbeam of the lower body 2 away from the first set of turning lugs 203. The third set of turning lugs 205 is welded to the inside of the foot plate of the outrigger of the lower body 2 that is close to the first set of turning lugs 203.

[0054] Step 4: Turn the lower piece over. Connect the hook of the gantry crane to the turning lug, lift the lower piece 2 and turn it over so that the top surface of the lower piece 2 is facing down and lying flat on the ground. The turning operation includes the following steps:

[0055] Step 4-1: The main hook 301 of the gantry crane is connected to the second set of turning lugs 204 by steel wire rope, and the auxiliary hook 302 of the gantry crane is connected to the first set of turning lugs 203 by steel wire rope.

[0056] Step 4-2: The main hook 301 and auxiliary hook 302 of the gantry crane rise simultaneously. After the lower piece 2 is lifted away from the ground, observe and determine whether there is any imbalance or uneven force on the wire rope. After confirming that there are no problems, proceed to the next step.

[0057] Step 4-3: The main hook 301 of the gantry crane continues to lift, and the auxiliary hook 302 of the gantry crane is lowered, so that the lower plate 2 is turned over to a vertical position. The lower plate 2 is then placed at the bottom using sleepers 4.

[0058] Step 4-4: The main hook 301 of the gantry crane is not released, while the auxiliary hook 302 of the gantry crane is released and the third set of turning lugs 205 is reconnected using wire rope.

[0059] Steps 4-5: The auxiliary hook 302 of the gantry crane is raised, and the main hook 301 of the gantry crane is lowered, so that the lower body 2 is flipped over and placed flat on the ground.

[0060] Step 5: Install the columns. Weld columns 5 to both sides of the top of the lower body 2. Weld the two columns 5 to the top of the foot plates of the two legs of the lower body 2.

[0061] Step 6: Install the upper piece. Use a gantry crane to lift the upper piece 1 above the column 5, weld the upper piece 1 to the column 5, and padded the bottom of the lower piece 2 with pads to form a simulated tooling.

[0062] Step 7: Measurement Unit Installation. Using a gantry crane, the measurement unit 6 is lifted to the vicinity of the simulated fixture. Then, a forklift is used to lift the measurement unit 6 onto the platform formed by the main crossbeam and pad beam 201 of the lower body 2. The measurement unit 6 includes a mounting bracket 601 and a hydraulic cylinder 602. The hydraulic cylinder 602 is mounted on the mounting bracket 601. A guide post 603 is coaxially mounted on the top of the piston rod of the hydraulic cylinder 602. The mounting bracket 601 has a through hole for the guide post 603 to pass through and move up and down. The guide post 603 is movably installed in the through hole, and a guide sleeve is movably fitted on the outside of the guide post 603. The guide sleeve is welded to the mounting bracket 601. A hydraulic jack 604 is coaxially installed on the guide post 603 of the measuring unit. The top of the hydraulic jack 604 is directly opposite the box girder structure 104 of the upper plate 1, and a pressure sensor 605 is installed on the top of the hydraulic jack 604. The level of the hydraulic jack 604 and the pressure sensor 605 is adjusted to prevent lateral torque. The measuring unit 6 is reinforced by the clamping plate 7.

[0063] Step 8: Zero-position adjustment. Pressurize the hydraulic jack 604. The hydraulic jack 604 applies force to the box girder structure 104 of the upper body 1. Observe the reading of the pressure sensor 605. Stop pressurizing when the reading reaches the required value of 20T. Use the station instrument to calibrate the zero-position height.

[0064] Step 9: Load test. Apply pressure to the hydraulic cylinder 602 of the measuring unit 6 at different stages according to the load arm test procedure, track the displacement distance of the piston rod of the hydraulic cylinder 602, and record the data. The load arm test procedure includes the following steps:

[0065] Step 9-1: Apply pressure to the hydraulic cylinder 602 of the measuring unit 6, record the displacement of the hydraulic cylinder piston rod at 4 positions within the given range, read the corresponding pressure sensor 605 readings, record the load of the simulated tooling, observe whether the simulated tooling is normal, mark the displacement of the hydraulic cylinder piston rod as X, and the 4 positions are respectively within the range of hydraulic cylinder piston rod displacement 60mm≤X<100mm, 100mm≤X<140mm, 140mm≤X<180mm, 180mm≤X<220mm;

[0066] Step 9-2: Compare the measured load value of the load measuring arm with the theoretical value. The deviation is within ±10% to be considered qualified.

[0067] Step 10: Unload the measurement unit.

[0068] The simulation test method of the load measuring arm of the present invention transforms the load measuring arm into a simulation fixture, which is placed on the ground. A hydraulic jack is used to simulate the force exerted by the ship on the load measuring arm. The load strength of the load measuring arm is evaluated based on the relationship between the load and displacement of the simulation fixture. Compared with the existing technology of testing on the ship hull, it is safer, has less influence from external factors during the entire testing process, and has higher testing accuracy.

[0069] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A simulation test method for a load measuring arm, characterized in that: The simulation test method includes the following steps: Step 1: Modify the upper body by welding a box girder structure to the middle of the bottom surface of the upper body; Step 2: Modify the lower piece. Remove excess components from the top surface of the lower piece, maintain the flatness of the top surface of the lower piece, add a pad beam on each of the two sides in the width direction of the lower piece, and add a reinforcing rib on the lower piece between the two pad beams. Step 3: Add turning lugs by welding three sets of turning lugs to the reinforcing ribs on the lower body. Step 4: Turn the lower piece over. Connect the hook of the gantry crane to the turning lug, lift the lower piece over, and place it flat on the ground with the top surface facing down. Step 5: Install the columns and weld the columns on both sides of the top of the lower body. Step 6: Install the upper piece. Use a gantry crane to lift the upper piece to the top of the column, weld the upper piece to the column, and padded the bottom of the lower piece with pads to form a simulated tooling. Step 7: Measurement unit installation. Use a gantry crane to lift the measurement unit to the vicinity of the simulation fixture, and then use a forklift to lift the measurement unit onto the platform formed by the lower plate and the pad beam. Install hydraulic jacks on the measurement unit and install pressure sensors on the hydraulic jacks. Adjust the level of the hydraulic jacks and pressure sensors to prevent lateral torque. Use clamps to reinforce the measurement unit. Step 8: Zero-position adjustment. Pressurize the hydraulic jack and observe the pressure sensor reading. Stop pressurizing when the reading reaches the required value. Use the station position instrument to calibrate the zero-position height. Step 9: Load test. Apply pressure to the hydraulic cylinder of the measuring unit at different stages according to the load arm test procedure, track the displacement distance of the hydraulic cylinder piston rod, and record the data. Step 10: Unload the measurement unit.

2. The simulation test method for the load measuring arm according to claim 1, characterized in that: The upper body consists of a main crossbeam and two legs. The main crossbeam is horizontally positioned, and the two legs are welded to the bottom sides of the main crossbeam and cooperate with the main crossbeam to form an inverted U-shaped structure. The legs consist of a support column and a foot plate. The support column is vertically welded to the bottom surface of the main crossbeam, and the foot plate is horizontally welded to the bottom of the support column and is perpendicular to the main crossbeam. The foot plate and the support column cooperate to form an inverted T-shaped structure. The structure of the lower sheet is the same as that of the upper sheet.

3. The simulation test method for the load measuring arm according to claim 2, characterized in that: In step 3, the three sets of turning lugs are the first set of turning lugs, the second set of turning lugs, and the third set of turning lugs. The first set of turning lugs is welded to the top surface of the main crossbeam of the lower body on the side near the outrigger. The second set of turning lugs is welded to the side of the main crossbeam of the lower body away from the first set of turning lugs. The third set of turning lugs is welded to the inside of the foot plate of the outrigger of the lower body near the first set of turning lugs. Step 4, the turning-over operation includes the following steps: Step 4-1: The main hook of the gantry crane is connected to the second set of turning lugs using a wire rope, and the auxiliary hook of the gantry crane is connected to the first set of turning lugs using a wire rope. Step 4-2: The main hook and auxiliary hook of the gantry crane rise simultaneously. After the lower piece is lifted away from the ground, observe and determine whether there is any uneven weight distribution or uneven tension on the wire rope. After confirming that there are no problems, proceed to the next step. Step 4-3: The main hook of the gantry crane continues to lift, and the auxiliary hook of the gantry crane is lowered, so that the lower plate is turned over to a vertical position. Use sleepers to support the bottom of the lower plate and let it stand still. Step 4-4: The main hook of the gantry crane is not released, the auxiliary hook of the gantry crane is released and the third set of turning lugs is reconnected using wire rope; Steps 4-5: The auxiliary hook of the gantry crane is raised, and the main hook of the gantry crane is lowered, so that the lower body is flipped over and placed flat on the ground.

4. The simulation test method for the load measuring arm according to claim 1, characterized in that: In step 8, the required value is 20T.

5. The simulation test method for the load measuring arm according to claim 1, characterized in that: In step 9, the load arm test procedure includes the following steps: Step 9-1: Apply pressure to the hydraulic cylinder of the measuring unit, record the displacement of the hydraulic cylinder piston rod at 4 positions within the given range, read the corresponding pressure sensor readings, record the load of the simulated tooling, and observe whether the simulated tooling is normal. Step 9-2: Compare the measured load value of the load measuring arm with the theoretical value. The deviation is within ±10% to be considered qualified.

6. The simulation test method for the load measuring arm according to claim 5, characterized in that: In step 9-1, the displacement of the hydraulic cylinder piston rod is X, and the four positions are respectively within the range of hydraulic cylinder piston rod displacement 60mm≤X<100mm, 100mm≤X<140mm, 140mm≤X<180mm, and 180mm≤X<220mm.

7. The simulation test method for the load measuring arm according to claim 1, characterized in that: The measuring unit includes a mounting bracket and a hydraulic cylinder. The hydraulic cylinder is mounted on the mounting bracket, and a guide column is coaxially mounted on the top of the piston rod of the hydraulic cylinder. The mounting bracket has a through hole for the guide column to pass through and move up and down. The guide column is movably disposed in the through hole.

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