A cable initial tension simulation device for model testing

Abstract

The present invention belongs to the technical field of physical model tests for ship marine engineering and port engineering, and specifically relates to a cable initial tension simulation device for model tests, including a base, a cable access module, a cable initial tension adjustment module and a cable fixing module. The cable initial tension simulation device for model tests provided by the present invention keeps the cables on the same horizontal line, reducing the tension simulation error caused by cable bending deformation; meets the initial tension simulation requirements of cables in different directions, and has strong adaptability; uses hanging weights to adjust the initial tension of the cables, which is easy to operate and can adjust multiple groups of cables at the same time with high efficiency; uses electromagnets to fix the cables to ensure that the cables are fixed at the same time, avoiding changes in the initial tension of the cables due to sequential fixing; the cables and the dynamometer are supported on gaskets, avoiding the previous suspended design and reducing the errors caused by the shaking of the dynamometer.

Description

Technical Field

[0001] The invention belongs to the technical field of physical model tests for ship ocean engineering and port engineering, and in particular relates to a cable initial tension simulation device for model tests. Background Art

[0002] At present, when conducting ship mooring physical model tests in ship marine engineering and port engineering physical model laboratories, in order to simulate the initial tension of each ship's mooring cable, similar adjustment screws are usually used to adjust the tightness of the mooring cable to achieve the purpose of simulating the initial tension of the mooring cable. Specifically, in a static water state, the cable is tightened by turning the adjustment screw, and the dynamometer value is observed at the same time. When the given initial tension value is reached, the screw is stopped, the adjustment is completed, and then the formal ship mooring physical model test is carried out.

[0003] As we all know, the initial tension of the ship's mooring cable has a significant impact on the mooring test results (including ship motion and cable tension). The initial tension of the mooring cable should be accurately simulated in the test to ensure the reliability of the test results. At the same time, the convenience of the simulation device should also be considered, especially when a large number of mooring cables are involved.

[0004] The conventional cable initial tension adjustment method currently used in various laboratories has the following problems: 1) The structure is too simple and can only achieve basic functions; 2) When the adjusting screw is turned, the mooring cable will also twist, thereby affecting the measurement of the tension value and resulting in poor precision control; 3) For situations where there are multiple groups of mooring cables, it is necessary to ensure that the initial tension of each cable reaches the required value at the same time. Conventional methods often require multiple people to work together and make manual linkage adjustments, which have a large human impact and are difficult to adjust; 4) Repeated adjustments are cumbersome. During the test, the initial tension value of the mooring cable will change due to environmental conditions such as wind and waves. After each test condition, the initial tension of the mooring cable needs to be readjusted, resulting in low test efficiency. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a cable initial tension simulation device for model testing in response to the defects involved in the background technology, which has solved the technical problems of existing conventional cable initial tension adjustment devices such as simple function, poor precision control, large human influence, high coordination difficulty and low work efficiency.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A cable initial tension simulation device for model testing comprises a base, a cable access module, a cable initial tension adjustment module and a cable fixing module.

[0008] The base is used to carry the cable access module, the cable fixing module and the cable initial tension adjustment module.

[0009] The cable access module is disposed at the first end of the base, and is used to connect the cable to the device and guide the direction of the cable to a preset direction.

[0010] The cable initial tension adjustment module is disposed at the second end of the base, and is used to adjust the initial tension of the cable to a preset initial tension.

[0011] The cable fixing module is arranged on the base, between the cable access module and the cable initial tension adjustment module, and is used for fixing the cable adjusted to a preset initial tension on the base.

[0012] Specifically, the cable access module includes a first mounting seat, a first pulley shaft and a first pulley.

[0013] The number of the first mounting seats is two, which are fixedly disposed at the first end of the base and arranged symmetrically about the first center line of the base. The first mounting seats are provided with mounting holes that match the first pulley shaft.

[0014] The first pulley shaft is detachably connected to the first mounting seat.

[0015] The first pulley is detachably sleeved on the first pulley shaft, and is used to connect the cable to the device along the cable groove of the first pulley, and to lead the cable out along the cable groove of the first pulley to a preset direction.

[0016] Specifically, the preset direction is a direction parallel to a first center line of the base, and a plane formed by the preset direction and the first center line is perpendicular to the base.

[0017] Specifically, the cable fixing module includes a second mounting seat, an electromagnet, a positioning column and a bottom block.

[0018] The positioning column is vertically arranged on the base, and is used to constrain the freedom of translation of the bottom block along the upper surface of the base.

[0019] The bottom block is made of ferromagnetic material, movably arranged on the base, and confined in the space defined by the positioning column.

[0020] The second mounting seat is fixedly disposed on the base and is used for supporting the electromagnet.

[0021] The electromagnet is arranged on the second mounting seat, and there is a gap between the iron core and the bottom block when the electromagnet is not energized.

[0022] Preferably, the bottom block is provided with a positioning hole matching the outer diameter of the positioning column, and the bottom block is sleeved on the positioning column.

[0023] Preferably, the number of the positioning columns is at least three, and the positioning columns are arranged according to the shape of the bottom block, and the outer contour of the positioning columns forms a space capable of accommodating the bottom block.

[0024] Specifically, the cable fixing module further includes a third mounting seat and a rotating stud.

[0025] The third mounting seat is fixedly arranged on the base, and a through hole is provided on one side of the third mounting seat parallel to the upper surface of the base, and an internal thread matching with the rotating stud is provided in the through hole.

[0026] The rotating stud is provided with an external thread matched with the internal thread, and the rotating stud is penetrated into the through hole by thread matching.

[0027] Preferably, the third mounting seat further comprises a gasket for adjusting the distance between the rotating stud and the base.

[0028] Specifically, the cable initial tension adjustment module includes a fourth mounting seat, a second pulley shaft, a second pulley and a weight.

[0029] The fourth mounting seat is fixedly disposed at the second end of the base, and two side surfaces of the fourth mounting seat parallel to the preset direction are provided with symmetrical elliptical through holes, and the length direction of the elliptical through holes is perpendicular to the base.

[0030] Both ends of the second pulley shaft are inserted into the elliptical hole, and the axis of the second pulley shaft is kept parallel to the base.

[0031] The second pulley is sleeved on the second pulley shaft, and the cable is routed out along the cable groove of the second pulley to suspend the weight.

[0032] Preferably, a gasket is provided between the cable access module and the cable fixing module, and / or between the cable initial tension adjustment module and the cable fixing module.

[0033] The beneficial effects of the present invention are as follows: the present invention provides a cable initial tension simulation device for model testing, which can keep the cables on the same horizontal line, thereby reducing the tension simulation error caused by the bending deformation of the cables; it can meet the initial tension simulation of cables in different directions, and has strong adaptability; it uses hanging weights to adjust the initial tension of the cables, which is easy to operate and can adjust multiple groups of cables at the same time with high efficiency; it uses electromagnets to fix the cables, which can ensure that the cables are fixed at the same time, avoiding the change in the initial tension of the cables due to sequential fixing; the cables and the tensile gauge are supported on the gasket, avoiding the previous suspended design and reducing the error caused by the shaking of the tensile gauge. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1It is a structural schematic diagram of a first embodiment of a cable initial tension simulation device for model testing of the present invention;

[0035] Figure 2 is a front view of a second embodiment of a cable initial tension simulation device for model testing of the present invention;

[0036] Figure 3 is a top view of a second embodiment of the cable initial tension simulation device for model testing of the present invention;

[0037] Figure 4 is a front view of a third embodiment of a cable initial tension simulation device for model testing of the present invention;

[0038] Figure 5 It is a top view of a third embodiment of the cable initial tension simulation device for model testing of the present invention. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not limit the present invention.

[0040] Embodiment 1

[0041] Figure 1 The figure shows the structure diagram of the first embodiment of the cable initial tension simulation device for model test of the present invention. When used for conducting ship mooring physical model test, the initial tension of each mooring cable of the ship is set, which can effectively reduce the error caused by human experience operation and greatly reduce the workload of adjusting the initial tension of multiple cables. It has good stability and convenient operation, and can play a greater role in ensuring the accuracy of model test and improving the efficiency of model test.

[0042] The cable initial tension simulation device for model testing of this embodiment includes a base 1, a cable access module 2, a cable initial tension adjustment module 3 and a cable fixing module 4.

[0043] The base 1 is used to carry the cable access module 2, the cable initial tension adjustment module 3 and the cable fixing module 4. That is, the base 1 is used as a platform on which various functional modules are arranged to set the initial tension of the cable and fix the cable with the initial tension set, thereby completing the initial tension setting of the cable. At the same time, the base 1 can be fixed on the model test platform to adjust the initial tension of the cable at any time according to the test process.

[0044] The cable access module 2 is disposed at the first end of the base 1, and is used to connect the cable to the device and guide the direction of the cable to a preset direction. The first end is one of the two ends of the base 1, and is not limited here. The preset direction is the direction of the first center line of the base 1, and the plane formed by the preset direction and the first center line is perpendicular to the base 1. The first center line here is the center line of the base 1 parallel to the longer side, and the plane formed by the preset direction and the first center line is perpendicular to the base 1, that is, the preset direction is directly above the first center line. Therefore, the cable access module 2 connects the cable to the device and guides the direction of the cable to a position directly above the first center line of the base 1.

[0045] The cable initial tension adjustment module 3 of this embodiment is arranged at the second end of the base 1, and is used to adjust the initial tension of the cable to a preset initial tension. The second end is the other end of the base 1 relative to the first end, that is, the cable access module 2 and the cable initial tension adjustment module 3 are respectively arranged at two opposite ends of the base 1, the cable is connected from the cable access module 2, and is led out from the cable initial tension adjustment module 3, and the initial tension of the cable is adjusted to the preset initial tension.

[0046] The cable fixing module 4 of this embodiment is arranged on the base 1, between the cable access module 2 and the cable initial tension adjustment module 3, and is used to fix the cable adjusted to the preset initial tension on the base 1. After the cable initial tension adjustment module 3 adjusts the initial tension of the cable to the preset initial tension, the cable needs to be fixed to maintain the initial tension. In the cable initial tension simulation device of the present invention, the cable fixing module 4 is arranged between the cable access module 2 and the cable initial tension adjustment module 3, which can conveniently fix the cable without affecting the setting of the cable initial tension, and is easy to operate and efficient.

[0047] Embodiment 2

[0048] Figure 2 , Figure 3 Shown are respectively the front view and top view of the second embodiment of the cable initial tension simulation device for model testing of the present invention. The cable initial tension simulation device for model testing of the second embodiment includes a base 1, a cable access module 2, a cable initial tension adjustment module 3 and a cable fixing module 4.

[0049] The base 1 is a sheet structure made of stainless steel and is used to carry the cable access module 2 , the cable initial tension adjustment module 3 and the cable fixing module 4 .

[0050] In this embodiment, the cable access module 2 includes a first mounting seat 21, a first pulley shaft 22 and a first pulley 23. There are two first mounting seats 21, which are fixedly arranged at the first end 11 of the base 1 and symmetrically arranged about the first center line 12 of the base 1. The first mounting seat 21 is provided with a mounting hole (not shown in the figure) matching the first pulley shaft 22. The first pulley shaft 23 is detachably connected to the first mounting seat 21. During specific installation, the first pulley shaft 22 can be inserted into the mounting hole of the first mounting seat 21, or the mounting hole is provided with an internal thread matching the first pulley shaft 22, and the first pulley shaft 22 is provided with an external thread, and the first pulley shaft 22 is installed on the first mounting seat 21 by thread matching, or other forms of installation are adopted, and the present invention does not impose any restrictions.

[0051] In this embodiment, the first pulley 23 is detachably mounted on the first pulley shaft 22, and is used to connect the cable to the device along the wire groove of the first pulley 23, and to lead the cable out to a preset direction along the wire groove of the first pulley 23. The cable access module 2 uses the first pulley 23 to access the cable and guide it to a preset direction. In a preferred embodiment, the preset direction is a direction parallel to the first center line 12 of the base 1, and the plane formed by the preset direction and the first center line 12 is perpendicular to the base 1. At this time, the center line of the wire groove of the first pulley 23 is tangent to the projection of the first center line 12 on the base 1, and the cable can be guided to the position directly above the first center line 12 of the base 1. Obviously, the preset direction can also be other directions, such as parallel to the first center line 12 but located obliquely above the first center line 12, which is not limited here.

[0052] The first mounting seat 21 is symmetrically arranged on the first center line 12 of the base 1, and can adapt to different access angles of the cable. When the cable is connected to the device from different access angles, the first pulley shaft 22 is installed on the appropriate first mounting seat 21 as needed, and the first pulley 23 is sleeved on the first pulley shaft 22, so that the cable can be connected and guided to the preset direction.

[0053] In the device of the present invention, the cable fixing module 4 is located between the cable access module 2 and the cable initial tension adjustment module 3, and is used to fix the cable adjusted to a preset initial tension on the base 1. In this embodiment, the cable fixing module 4 uses the attraction of an electromagnet to fix the cable, and specifically includes a second mounting seat 41, an electromagnet 42, a positioning column 43 and a bottom block 44.

[0054] Among them, the positioning column 43 is vertically arranged on the base 1, and is used to constrain the freedom of the bottom block 44 to move along the upper surface of the base 1; the bottom block 44 is movably arranged on the base 1 and is confined in the space defined by the positioning column 43. The bottom block 44 is made of ferromagnetic material.

[0055] The second mounting seat 41 of the cable fixing module 4 is fixedly set on the base 1, and is used to carry the electromagnet 42. The electromagnet 42 is set on the second mounting seat 41. When the electromagnet 42 is not energized, there is a gap between the iron core and the bottom block 44. The size of the gap can be adjusted by placing a gasket on the bottom block 44 so that the cable is supported on the gasket when it is not fixed instead of being suspended in the air.

[0056] After the initial tension of the cable is set, the cable needs to be fixed. It only needs to energize the electromagnet 42. At this time, the iron core generates magnetic force, and the iron core and the bottom block 44 are attracted to clamp the cable between the iron core and the bottom block 44, so that the cable is fixed. In this embodiment, the cable fixing module 4 is arranged between the cable access module 2 and the cable initial tension adjustment module 3, which can conveniently fix the cable without affecting the setting of the cable initial tension, and the operation is simple and efficient.

[0057] In this embodiment, in order to limit the translation of the bottom block 44 along the upper surface of the base 1, the positioning columns 43 are used to realize the positioning of the bottom block 44, wherein the number of the positioning columns 43 is at least three, and they are arranged according to the shape of the bottom block 44, so that the outer contour of the positioning columns 43 forms a space that can accommodate the bottom block 44. In this embodiment, the bottom block 44 is circular, and at least three positioning columns 43 can be arranged tangentially along the periphery of the bottom block 44, preferably 4 positioning columns 43 are evenly arranged along the periphery of the bottom block 44 at 90 degrees, and the positioning columns 43 can form a space that can just accommodate the bottom block 44, and at this time, the bottom block 44 cannot freely translate on the upper surface of the base 1, thereby realizing the function of limiting positioning.

[0058] In addition to using multiple positioning columns for positioning, other positioning methods can also be used. In a preferred embodiment, positioning holes matching the outer diameter of the positioning columns 43 can be provided on the bottom block 44 , and the bottom block 44 can be positioned by being sleeved on the positioning columns 43 .

[0059] The second mounting seat 41 , the electromagnet 42 , the positioning column 43 and the bottom block 44 constitute an electromagnet type cable fixing module.

[0060] In the device of the present invention, the cable initial tension adjustment module 3 is used to adjust the initial tension of the cable to a preset initial tension, and includes a fourth mounting seat 31, a second pulley shaft 32, a second pulley 33 and a weight.

[0061] Among them, the fourth mounting seat 31 is fixedly arranged on the second end 13 of the base 1, and the second end 13 is the other end of the base 1 relative to the first end 11. The fourth mounting seat 31 is provided with symmetrical elliptical through holes 34 on two sides parallel to the preset direction, and the length direction of the elliptical through holes 34 is perpendicular to the base 1. The two ends of the second pulley shaft 32 are passed through the elliptical holes 34, and the axis of the second pulley shaft 32 is kept parallel to the base 1. The second pulley 33 is sleeved on the second pulley shaft 32. By adjusting the position of the second pulley shaft 32 in the elliptical hole 34, the height of the second pulley 33 can be adjusted, that is, the height of the cable can be adjusted. After the cable is discharged along the wire groove of the second pulley 33, a weight block is hung. According to the size of the preset initial tension of the cable, weight blocks of different specifications, such as weights, are selected, and the weight block is hung on the cable outlet end. At this time, the initial tension of the cable is equal to the weight of the weight block, thereby completing the setting of the initial tension of the cable.

[0062] In order to keep the cables on the same horizontal line and prevent them from bending and deforming, thereby affecting the accuracy of the initial tension of the cables, in a preferred embodiment, a gasket is provided between the cable access module 2 and the cable fixing module 4, and / or between the cable initial tension adjustment module 3 and the cable fixing module 4, and the cables are supported on the gasket to ensure that the cables are on the same horizontal line.

[0063] Embodiment 3

[0064] Figure 3 , Figure 4 Shown are respectively the front view and top view of the third embodiment of the cable initial tension simulation device for model testing of the present invention. The cable initial tension simulation device for model testing of embodiment three includes a base 1, a cable access module 2, a cable initial tension adjustment module 3 and a cable fixing module 4.

[0065] Among them, the base 1, the cable access module 2, the cable initial tension adjustment module 3 and the cable fixing module 4 are the same as those in the second embodiment and are not described again here.

[0066] In this embodiment, the cable fixing module 4 also includes a third mounting seat 45 and a rotating stud 46, wherein the third mounting seat 45 is provided with a through hole on one side parallel to the upper surface of the base 1, and the through hole is provided with an internal thread that cooperates with the rotating stud 46; the rotating stud 46 is provided with an external thread that cooperates with the internal thread, and the rotating stud 46 is penetrated through the through hole by means of thread cooperation, thereby being installed on the third mounting seat 45.

[0067] When the initial tension of the cable is set and needs to be fixed, the rotating stud 46 in this embodiment is rotated, and the rotating stud 46 moves downward and approaches the base 1, so that the cable is fixed on the base 1.

[0068] In a preferred embodiment, the third mounting seat 45 further includes a gasket for adjusting the distance between the rotating stud 46 and the base 1, so that the cable is supported on the gasket when it is not fixed, thereby preventing it from bending and affecting the initial tension accuracy.

[0069] The third mounting seat 45 and the rotating stud 46 constitute a stud-type cable fixing module.

[0070] Embodiment 4

[0071] The fourth embodiment of the cable initial tension simulation device for model testing of the present invention comprises a base 1, a cable access module 2, a cable initial tension adjustment module 3 and a cable fixing module 4. Among them, the base 1, the cable access module 2 and the cable initial tension adjustment module 3 are the same as those of the first embodiment, and the cable fixing module 4 comprises the electromagnet type cable fixing module of the second embodiment and the stud type cable fixing module of the third embodiment, and the relative position between the electromagnet type cable fixing module and the stud type cable fixing module is not limited. By using two different cable fixing modules, the fixing of the cable with the initial tension set can be better achieved.

[0072] In summary, the cable initial tension simulation device for model testing provided by the present invention can keep the cables on the same horizontal line, thereby reducing the tension simulation error caused by the bending deformation of the cables; it can meet the initial tension simulation of cables in different directions and has strong adaptability; it uses hanging weights to adjust the initial tension of the cables, which is easy to operate and can adjust multiple groups of cables at the same time with high efficiency; it uses electromagnets to fix the cables, which can ensure that the cables are fixed at the same time, avoiding the change in the initial tension of the cables due to sequential fixing; the cables and the dynamometer are supported on the gasket, avoiding the previous suspended design and reducing the error caused by the shaking of the dynamometer.

[0073] Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are also possible, and therefore, the scope of the present invention should not be limited to the above embodiments. For those of ordinary skill in the art, several improvements can also be made without departing from the principles of the present invention, and these improvements should also be regarded as the scope of protection of the present invention.

Claims

1. A cable initial tension simulation device for model testing, characterized in that: include: Base, cable access module, cable initial tension adjustment module and cable fixing module; The base is used to carry the cable access module, the cable initial tension adjustment module and the cable fixing module; The cable access module is disposed at the first end of the base, and is used to connect the cable to the device and guide the direction of the cable to a preset direction; The cable initial tension adjustment module is disposed at the second end of the base, and is used to adjust the initial tension of the cable to a preset initial tension; The cable fixing module is disposed on the base, between the cable access module and the cable initial tension adjustment module, and is used to fix the cable adjusted to a preset initial tension on the base; The cable access module includes a first mounting seat, a first pulley shaft and a first pulley; The number of the first mounting seats is 2, which are fixedly disposed at the first end of the base and symmetrically arranged about the first center line of the base, and the first mounting seats are provided with mounting holes matching the first pulley shaft; The first pulley shaft is detachably connected to the first mounting seat; The first pulley is detachably mounted on the first pulley shaft, and is used to connect the cable to the device along the cable groove of the first pulley, and to lead the cable out along the cable groove of the first pulley to a preset direction; The cable fixing module comprises a second mounting seat, an electromagnet, a positioning column and a bottom block; The positioning column is vertically arranged on the base, and is used to constrain the freedom of translation of the bottom block along the upper surface of the base; The bottom block is made of ferromagnetic material, movably arranged on the base, and confined within the space defined by the positioning column; The second mounting seat is fixedly disposed on the base and is used to carry the electromagnet; The electromagnet is arranged on the second mounting seat, and when the electromagnet is not energized, there is a gap between the iron core and the bottom block; The cable initial tension adjustment module includes a fourth mounting seat, a second pulley shaft, a second pulley and a weight; The fourth mounting seat is fixedly disposed at the second end of the base, and two side surfaces of the fourth mounting seat parallel to the preset direction are provided with symmetrical elliptical through holes, and the length direction of the elliptical through holes is perpendicular to the base; Both ends of the second pulley shaft are inserted into the elliptical through hole, and the axis of the second pulley shaft is kept parallel to the base; The second pulley is sleeved on the second pulley shaft, and the cable is routed out along the cable groove of the second pulley to suspend the weight.

2. A cable initial tension simulation device for model testing according to claim 1, characterized in that: The preset direction is a direction parallel to a first center line of the base, and a plane formed by the preset direction and the first center line is perpendicular to the base.

3. A cable initial tension simulation device for model testing according to claim 1, characterized in that: The bottom block is provided with a positioning hole matching the outer diameter of the positioning column, and the bottom block is sleeved on the positioning column.

4. A cable initial tension simulation device for model testing according to claim 1, characterized in that: The number of the positioning posts is at least three, and the positioning posts are arranged according to the shape of the bottom block. The outer contour of the positioning posts forms a space capable of accommodating the bottom block.

5. A cable initial tension simulation device for model testing according to any one of claims 3 to 4, characterized in that: The cable fixing module includes a third mounting seat and a rotating stud; The third mounting seat is fixedly arranged on the base, and a through hole is provided on one side of the third mounting seat parallel to the upper surface of the base, and an internal thread matching with the rotating stud is provided in the through hole; The rotating stud is provided with an external thread matched with the internal thread, and the rotating stud is penetrated into the through hole by thread matching.

6. A cable initial tension simulation device for model testing as claimed in claim 5, characterized in that: The third mounting seat also includes a gasket for adjusting the distance between the rotating stud and the base.

7. A cable initial tension simulation device for model testing according to claim 1, characterized in that: A gasket is provided between the cable access module and the cable fixing module, and / or between the cable initial tension adjustment module and the cable fixing module.

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