Mooring system pre-tension and length multi-stage retractable adjustment device for tank testing

Abstract

The present invention belongs to the technical field of marine equipment, and provides a multi-stage retractable pre-tension and length adjustment device for a mooring system for a water tank test, including an adjustable frame, a tensioning mechanism, a tension measuring device, a flexible measuring unit and a vernier measuring unit. Among them, the tensioning mechanism is installed on the adjustable frame, one end of the mooring system cable is connected to the tension measuring device, and the other end is connected to the loading mechanism. The adjustment direction of the adjustable frame matches the measurement path of the flexible measuring unit; the vernier measuring unit is provided with a vernier scale line, and the main scale line is located on the adjustable frame. The measurement path of the vernier measuring unit and the measurement path of the flexible measuring unit are coupled. The present invention has a simple structure and low cost. It is designed through an adjustable frame to adapt to mooring systems of different lengths, and realizes multi-stage adjustment of pre-tension through a loading mechanism, and utilizes a coupled measurement path to accurately measure the mooring system, thereby improving test efficiency and data accuracy.

Description

Technical Field

[0001] The invention belongs to the technical field of marine equipment, and in particular relates to a pre-tension and length multi-stage telescopic adjustment device for a mooring system used for a water tank test. Background Art

[0002] In marine engineering, tank tests are an important means of simulating the actual marine environment and testing the behavior of floating structures. Among them, since the mooring system is a key component of marine engineering, the adjustment of its pre-tension and length plays a vital role in ensuring the stability and accuracy of the test model.

[0003] The pre-tension of the mooring system refers to the initial tension applied to the mooring system during the installation process. Its main purpose is to improve the stability of the entire mooring system and reduce the movement of the floating body caused by wind, waves and currents. In addition, the pre-tension can effectively disperse the impact of instantaneous external forces on the mooring system, reduce dynamic loads and fatigue damage, and thus extend the service life of the mooring system. Length adjustment enables the mooring system to adapt to different water depths, structural forms and other conditions, ensuring the stability and reliability of the floating structure under various operating conditions.

[0004] During the tank test, the adjustment of the mooring system pretension and length is a time-consuming task, and the rental of the tank laboratory is high, so the use of efficient and high-precision pretension adjustment and flexible length adjustment equipment is the basis for ensuring the rapid progress of the model test. However, the current methods for adjusting the pretension and length of the mooring system have some limitations.

[0005] Specifically, the traditional method is to roughly match the pre-tension by manually adjusting the position of the mooring anchor point. This method cannot meet the needs of high-precision pre-tension control, and because the adjustment amplitude cannot be accurately controlled, it leads to repeated operations, and there are problems of small or large pre-tension; small pre-tension may cause the model to deviate from the predetermined position during the test, while excessive pre-tension may cause structural damage. In addition, since the adjustment of the mooring system requires the experimenter to wear waterproof clothing in the pool to make adjustments, the above operation is dangerous, and in the case of deep water and turbid water, the difficulty of adjustment will be greatly increased, affecting the overall test efficiency.

[0006] On the basis of the above, in order to solve the problem of pre-tension adjustment, technicians designed automated equipment to adjust the mooring system. For example, Chinese patent CN109533207B proposed a method for automatically adjusting the pre-tension of mooring cables in a water tank model test. The pre-tension of the mooring cables is monitored and adjusted in real time by a control unit and a calculation unit. Although the test efficiency and accuracy are improved, the focus is on the method rather than the device. There is a lack of detailed hardware design and description of the specific implementation device. This means that in practical applications, users still need to design and develop corresponding hardware to cooperate with the method, which increases the complexity and uncertainty of implementation. For example, Chinese patent application CN116891159A proposed a cable pre-tension adaptive adjustment test device, which realizes pre-tension adjustment and calibration through a servo motor and a tension sensor, but the device relies on a single control loop for pre-tension adjustment. Under complex experimental conditions, the adjustment of a single servo motor cannot meet the high-precision requirements, especially in the conversion between fine adjustment and coarse adjustment, lacking sufficient flexibility and fine control. In addition, the device relies on a wireless transmission module for data transmission, which may cause delays or data loss in a signal interference environment, affecting the effectiveness of real-time feedback. At the same time, the existing adjustment device has a fixed size and cannot adapt to mooring systems of different lengths, which limits its application scope; in particular, in tests that need to simulate multiple working conditions, for example: when conducting model tests comparing different mooring configurations, the fixed-length adjustment device cannot meet the requirements of the water tank test. Furthermore, after the existing technology adds an adjustment mechanism, the measurement result accuracy will decrease due to error accumulation, and / or the installation positioning accuracy will decrease, which will lead to other test problems.

[0007] In summary, it is also necessary to design an adjustment device that can be used to adjust the pre-tension and length of the mooring system in the water tank test, which can maintain good measurement accuracy and test efficiency on the basis of simplifying the structure and reducing costs. Summary of the invention

[0008] In view of the problems existing in the prior art, the present invention provides a pre-tension and length multi-stage telescopic adjustment device for a mooring system for a water tank test, which solves the above problems by optimizing the overall structural design.

[0009] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0010] A multi-stage retractable pre-tension and length adjustment device for a mooring system for a water tank test, which mainly comprises an adjustable frame, a tensioning mechanism, a tension measuring device, a flexible measuring unit and at least one set of vernier measuring units;

[0011] The tensioning mechanism is mounted on the adjustable frame and is provided with a loading mechanism; one end of the mooring system cable is connected to the detection end of the tension measuring device, and the other end is connected to the loading mechanism;

[0012] The loading mechanism is provided with a multi-input speed-changing gear set, and the output shaft is fixedly connected to the mooring system cable; the input end of the multi-input speed-changing gear set is divided into at least a fine-adjustment input end and a coarse-adjustment input end according to the reduction ratio;

[0013] The free end and the fixed end of the flexible measuring unit are respectively fixedly connected to different supporting components on the adjustable frame, and all adjustment directions of the adjustable frame match the measuring path of the flexible measuring unit;

[0014] The vernier measuring unit is detachably connected or slidably connected to the adjustable frame; the main scale lines of the vernier measuring unit are located on the adjustable frame, and the vernier measuring unit is also provided with vernier scale lines;

[0015] The measuring path of the vernier measuring unit and the measuring path of the flexible measuring unit are coupled.

[0016] Furthermore, the adjustable frame is a square frame structure, and the support assembly of the adjustable frame is provided with at least a two-degree-of-freedom telescopic mechanism; the two-degree-of-freedom telescopic mechanism is also provided with a positioning structure;

[0017] The two-degree-of-freedom telescopic mechanism comprises a column and a horizontal support rod of the adjustable frame; both the column and the horizontal support rod are telescopic rod structures;

[0018] The positioning structure includes a positioning hole and a latch; a plurality of the positioning holes are provided on the column and the horizontal support rod; the latch cooperates with the positioning hole;

[0019] The tensioning mechanism is further provided with a fixed pulley block, the mooring system cable is straddled over the fixed pulley block, and the installation path of the mooring system cable matches at least part of the adjustment direction of the adjustable frame.

[0020] Furthermore, the flexible measuring unit is provided with a flexible scale and a tape-retracting measuring disc, and the flexible scale is connected to the tape-retracting measuring disc;

[0021] A positioning fixed pulley is provided at the connection between at least one group of the uprights and the horizontal support rods;

[0022] The free end of the flexible scale is fixedly connected to the end of the column; the reel is fixedly connected to the horizontal support rod; the flexible scale is connected across the positioning fixed pulley;

[0023] The end of the column is located on a positioning plane, and a detection end of the tension measuring device is also arranged on the positioning plane.

[0024] Furthermore, the telescopic rod structure of the upright column and the horizontal support rod is a nested sliding rod structure;

[0025] The positioning holes include inner positioning holes and outer positioning holes, and the spacings between the inner positioning holes and the outer positioning holes are not all the same.

[0026] Furthermore, the loading mechanism is also provided with a bidirectional ratchet structure;

[0027] The bidirectional ratchet structure is coaxially connected to the output shaft of the multi-input speed-changing gear set;

[0028] A self-locking lever is provided on the operation panel of the loading mechanism, and the self-locking lever is connected to the ratchet pawl of the bidirectional ratchet structure.

[0029] Furthermore, the output shaft of the multi-input speed-changing gear set is coaxially fixedly connected with a coarse adjustment driven gear and a fine adjustment driven gear;

[0030] A fine-tuning driving gear is coaxially fixedly connected to the input shaft of the fine-tuning input end;

[0031] A coarse adjustment driving gear is coaxially fixedly connected to the input shaft of the coarse adjustment input end;

[0032] The fine adjustment driving gear is meshed with the fine adjustment driven gear; the coarse adjustment driving gear is meshed with the coarse adjustment driven gear;

[0033] The power unit of the loading mechanism is a hand crank or an electric drive mechanism.

[0034] Furthermore, the number of teeth of the ratchet of the bidirectional ratchet structure is the same as the number of teeth of the fine-adjustment driven gear; the gear ratio of the fine-adjustment driven gear to the coarse-adjustment driven gear is 10;

[0035] The gear ratio of the fine-tuning driven gear to the fine-tuning driving gear is in the range of 10-20;

[0036] The gear ratio of the coarse adjustment driving gear to the coarse adjustment driven gear is in the range of 3-5.

[0037] Further, the vernier measurement unit is provided with a vernier ruler and a cable pointer;

[0038] The cable pointer is fixedly connected to the vernier ruler, and its tip is facing the mooring system cable;

[0039] The end of the cable pointer is also provided with a transmitting end of a laser line projector.

[0040] Further, the tension measuring device comprises a coaxial tension sensor and a lower computer;

[0041] The lower computer is installed on the adjustable frame.

[0042] Furthermore, a plurality of universal brake rollers are provided at the bottom of the adjustable frame.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] The adjusting device of the present invention has a simple structure and low cost. It is designed with an adjustable frame to adapt to mooring systems of different lengths, and a plurality of loading mechanisms are used to achieve precise multi-stage adjustment of pre-tension, thereby ensuring that the pre-tension during the adjustment process is stable and controllable. Furthermore, during the adjustment process, a flexible measuring unit and a vernier measuring unit of a coupled measurement path are used to achieve precise measurement of different length positions of the mooring system, reduce the influence of errors, and thus efficiently, accurately and cost-effectively adjust the length and pre-tension of the mooring system, thereby improving test efficiency and data accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0046] Figure 1 It is a front perspective view of the adjusting device in a specific embodiment of the present invention;

[0047] Figure 2 It is a rear perspective view of the adjusting device in a specific embodiment of the present invention;

[0048] Figure 3 It is a stereoscopic diagram of the telescopic structure in a specific embodiment of the present invention;

[0049] Figure 4 It is a front perspective view of a multi-input speed change gear set in a specific embodiment of the present invention;

[0050] Figure 5 It is a side view of a multi-input speed change gear set in a specific embodiment of the present invention;

[0051] Figure 6 It is a rear perspective view of a multi-input speed change gear set in a specific embodiment of the present invention;

[0052] Figure 7 It is a schematic diagram of the installation position of the automatic power unit of the loading mechanism in a specific embodiment of the present invention;

[0053] Figure 8 It is a side view of the installation position of the automatic power unit of the loading mechanism in a specific embodiment of the present invention;

[0054] Fig. 9 It is a stereoscopic diagram of the installation position of the cable pointer in a specific embodiment of the present invention;

[0055] Fig.10 It is a front view of a vernier ruler in a specific embodiment of the present invention;

[0056] Fig.11 It is a schematic diagram of the structure of a universal brake wheel in a specific embodiment of the present invention.

[0057] In the figure: 1 vertical frame, 2 horizontal frame, 3 telescopic rod structure, 4 fixed pulley block, 5 coaxial tension sensor, 6 loading mechanism, 7 mooring system cable, 8 universal brake roller, 9 reel-up plate, 10 vernier measuring unit, 11 lower computer, 12 fine-tuning stepper motor, 13 coarse-tuning stepper motor, 14 coupling, 15 signal transmission line, 16 control box, 101 main scale line, 301 outer sleeve, 302 inner slide rod, 303 positioning hole, 304 latch, 60 1. Fine-tuning hand crank, 602. Fine-tuning driving gear, 603. Fine-tuning input shaft, 604. Coarse-tuning hand crank, 605. Coarse-tuning driving gear, 606. Coarse-tuning input shaft, 607. Fine-tuning driven gear, 608. Output shaft, 609. Ratchet, 610. Coarse-tuning driven gear, 611. Fixed shaft, 612. Reverse ratchet pawl, 613. Forward ratchet pawl, 1001. Vernier scale, 1002. Permanent magnet, 1003. Cable pointer, 1004. Main scale pointer, 1005. Vernier scale line. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0060] In the description of the present invention, it is necessary to understand that the relative relationships indicated by the terms "upper" and "lower" are based on the upper and lower relationships corresponding to the device when it is installed in an actual application. They are for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position. Therefore, they cannot be understood as limitations on the present invention.

[0061] In the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] It should be noted that the methods used in the present invention are all conventional methods unless otherwise specified; the raw materials and devices used are all conventional commercially available products unless otherwise specified.

[0063] It should also be noted that the path and direction matching described in the present invention should be understood in combination with the specific structure as follows: there is at least one path on the entire path that is designed in the same direction as the matching direction, and the change of the overall structure in the direction will cause the length of the path to change, thereby generating a correlation between the structural dimension and the measurement dimension. In addition, regarding the coupling of the measurement path, it should be understood that different measurement paths have the same measurement basis or the same fixed measurement point, and in the measurement process of a certain dimensional parameter, a complete measurement link can be constructed through the correlation between two or more measurement paths to obtain measurement data.

[0064] The present invention provides a Figure 1 and Figure 2 The mooring system pre-tension and length multi-stage retractable adjustment device for pool testing shown mainly includes an adjustable frame, a tensioning mechanism, a tension measuring device, a flexible measuring unit and at least one set of vernier measuring units.

[0065] The adjustable frame adopts a square frame structure, including a vertical frame 1 and a horizontal frame 2, which are formed by splicing metal profiles. A two-degree-of-freedom telescopic mechanism is set on the above-mentioned support assembly; specifically, the horizontal support rods in the horizontal frame 2 and the columns of the vertical frame 1 are set as a telescopic rod structure 3.

[0066] like Figure 3As shown, the telescopic rod structure 3 adopts a nested sliding rod structure, which is provided with an outer sleeve 301 and an inner sliding rod 302, and the adjustable frame is changed in two degrees of freedom, namely, height adjustment and width adjustment, through sliding connection. At the same time, in order to fix the structural dimensions of the adjustable frame after adjustment, a positioning structure is provided on the telescopic rod structure 3, including a positioning hole 303 and a latch 304, and the latch 304 is inserted into the positioning hole 303 of the outer sleeve 301 and the inner sliding rod 302 to complete the positioning and fixing work. Preferably, common positioning holes are arranged equidistantly along the long side direction, but in this embodiment, because the adjustable frame bears the force of the loading mechanism, the combined clearance of the support assembly will affect the size measurement, and then affect the final test accuracy; therefore, in order to solve the problem of multi-level positioning and stable connection, the positioning holes are set differently; specifically, the positioning holes on the outer sleeve 301 are outer positioning holes, and the positioning holes on the inner slide bar 302 are inner positioning holes, and the spacing between the outer positioning holes and the spacing between the inner positioning holes are not all the same, and there is a certain difference between the inner and outer hole spacings, such as the hole spacing of the outer positioning holes is 10mm, and the hole spacing of the inner positioning holes on the single inner slide bar 302 has four types of spacings of 9mm, 10mm, 11mm, and 13mm, so as to find a suitable positioning hole alignment according to the telescopic length requirements and then insert the pin to achieve multi-level positioning. On this basis, since the hole spacing is not all the same, two pins can be set in the single telescopic rod structure 3, and after the length is adjusted, two holes that are close to alignment are found and the pins are inserted respectively, so as to increase the overall connection stability in an interference fit manner. This design is different from the traditional design. It does not need to improve the adjustment accuracy by increasing the positioning hole processing accuracy. It can also improve the overall stability, which is conducive to maintaining the frame with good dimensional accuracy during subsequent loading.

[0067] The tensioning mechanism is installed on the adjustable frame and is provided with a fixed pulley block 4 and a loading mechanism 6. The fixed pulley block 4 has two fixed pulleys, which are respectively installed at the two ends of the upper horizontal frame. The mooring system object tested in this embodiment is a mooring system cable 7, which is connected across the fixed pulley block 4, and one end is connected to the detection end of the tension measuring device, and the other end is connected to the execution unit of the loading mechanism 6. Therefore, by adjusting the height and width of the adjustable frame, different lengths of the mooring system cable 7 can be adapted.

[0068] Combination Figure 1 , Figure 2 and Figure 4-Figure 6As shown, a transmission mechanism protective shell is provided on the outside of the loading mechanism 6, an operation panel is provided on the front, and a multi-input speed-change gear set is provided inside. Among them, the multi-input speed-change gear set is provided with a single output shaft 608, and a fine-tuning driven gear 607 and a coarse-tuning driven gear 610 are coaxially fixedly connected on the front side. The multi-input speed-change gear set of this embodiment is provided with two input ends in total, which are divided into a fine-tuning input end and a coarse-tuning input end according to the size of the reduction ratio. Specifically, a fine-tuning driving gear 602 is coaxially fixedly connected to the fine-tuning input shaft 603 of the fine-tuning input end, and the fine-tuning driving gear 602 is meshed with the fine-tuning driven gear 607. A coarse-tuning driving gear 605 is coaxially fixedly connected to the coarse-tuning input shaft 606 of the coarse-tuning input end, and the coarse-tuning driving gear 605 is meshed with the coarse-tuning driven gear 610. In order to simplify the electrical structure, the power unit of this embodiment is set as a hand crank, the fine-tuning hand crank 601 is connected to the fine-tuning input shaft 603, and then the coarse-tuning hand crank 604 is connected to the coarse-tuning input shaft 606. In order to realize both coarse and fine-tuning operations, it is also necessary to select the number of teeth of the matching gear set. Therefore, the preferred design is that the tooth ratio of the fine-tuning driven gear 607 to the fine-tuning driving gear 602 is in the range of 10-20, preferably 10; the tooth ratio of the coarse-tuning driving gear 605 to the coarse-tuning driven gear 610 is in the range of 3-5, preferably 3. In this embodiment, the specific design is: the number of teeth of the fine-tuning driven gear 607 is 150; the number of teeth of the fine-tuning driving gear 602 is 15; the number of teeth of the coarse-tuning driven gear 610 is 15; the number of teeth of the coarse-tuning driving gear 605 is 45, thereby improving the test accuracy to ±0.1N. The end of the output shaft 608 is a fixed shaft 611, which serves as an execution unit. The end is punched with a hole to pass through the mooring system cable 7 and fixed. Therefore, the operator first turns the coarse adjustment hand crank 604 to quickly load the mooring system cable 7, and then turns the fine adjustment hand crank 601 to fine-tune the load. Furthermore, in order to maintain stability during forward and reverse loading and unloading, and to avoid damage to the mooring system or test equipment due to operational errors or unexpected situations, the present embodiment also provides a bidirectional ratchet structure in the loading mechanism 6. Specifically, the bidirectional ratchet structure includes a ratchet 609 and a pair of ratchet pawls arranged in both directions. The ratchet 609 is coaxially fixed on the output shaft 608, and the number of teeth of the ratchet 609 is the same as the number of teeth of the fine adjustment driven gear 607. The ratchet pawls are a reverse ratchet pawl 612 and a forward ratchet pawl 613, respectively. Furthermore, in order to manually select forward rotation or reverse rotation, two sets of self-locking levers are provided on the operation panel of the loading mechanism 6, and each set of self-locking levers is connected to a corresponding ratchet pawl. When forward rotation is required (turning the crank clockwise facing the operation panel), the operator pushes the forward self-locking lever to lift the forward ratchet pawl 613, so that forward rotation is possible and reverse rotation is stopped. It is understandable that when it is necessary to increase the convenience of operation, an interconnection mechanism can also be provided between the two sets of self-locking levers, so that when the operator swings one lever, the other lever automatically returns to the initial state. The specific design can be based on actual needs and will not be repeated here.

[0069] Optionally, in another embodiment, in order to improve the overall automation level and obtain a more accurate pre-tension adjustment result, as Figure 7 and Figure 8 As shown, the hand crank design is replaced with an automated power unit, i.e., an electric drive mechanism. The electric drive mechanism includes a fine-tuning stepper motor 12 and a coarse-tuning stepper motor 13 hoisted outside the loading mechanism 6, and the two motors are respectively connected to the fine-tuning input shaft 603 and the coarse-tuning input shaft 606 through a coupling 14. The step angles of the two stepper motors are precisely set to be the same as the pitch angles of the corresponding active gears, so that the motor can drive the gear to rotate one tooth every time it steps. This matching design ensures that each step of the motor can accurately correspond to a pitch of the gear, thereby achieving precise mechanical transmission and adjustment control. The coupling 14 is used to transmit the rotational motion of the motor to the input shaft. It can not only transmit a large torque, but also has a certain flexibility to absorb the impact caused by the start or stop of the motor to ensure the smooth operation of the system. A control box 16 is installed on the adjustable frame, which is equipped with a carrier board, a processor, a storage medium and a motor driver, and is integrated with a control system. The control system includes a data acquisition module, an operation processing module and a control output module. The data acquisition module receives real-time data from the sensor; the operation processing module calculates and compares the input target tension value and the real-time measured tension value; the control output module sends a control signal instruction, and the two stepper motors are connected to the control box 16 through the signal transmission line 15. A human-machine interface is also provided, and the operator inputs the target tension value through the human-machine interface, and can monitor the tension change and motor status during the adjustment process in real time. Further, the control box 16 is also connected to the lower computer 11 of the tension measurement device through the signal transmission line 15. During operation, the operator inputs the required target tension value through the human-machine interface. The control system uses this value as a reference to drive the motor to adjust the pretension of the mooring system. During the adjustment process, the control system first starts the coarse adjustment stepper motor 13 to drive the gear set for preliminary adjustment. At this stage, a larger step angle is used to quickly approach the target tension value; the control system monitors the data of the tension sensor in real time, and when the tension approaches the target value, the step angle is gradually reduced to avoid a large over-adjustment. After that, the fine adjustment stage is entered when the judgment threshold is just exceeded: specifically, when the coarse adjustment motor drives the last step of the gear rotation, the control system will determine whether the tension value just exceeds the predetermined value. Here, "just" means that before the last step, the tension value is lower than the target value, and after the step, the tension value exceeds the target value but is still within the allowable error range. The system starts the fine-tuning stepper motor 12, and the motor drives the output shaft at a smaller step angle through the coupling. At this time, the lever is switched, and the fine-tuning stepper motor 12 fine-tunes to the target tension value by reducing the tension in the reverse direction, so that it is accurately stabilized within the target tension value range.

[0070] System lock and state preservation: When the tension reaches the target value and remains stable, the control system stops the motor and locks the current state to prevent tension changes caused by external interference. The system saves the current tension value and motor state as experimental data for subsequent analysis.

[0071] The above design does not adopt the traditional design of a single motor connected to the cable through a reducer. The reason for setting up two motors to work in conjunction is to use the currently non-acting motor as a damping mechanism for the acting motor, thereby making the loading process smoother and no longer having fluctuations in the loading or adjustment gap like a single motor.

[0072] On the basis of adjustable length and load, this embodiment also needs to realize accurate measurement and marking of the mooring system cable 7, so a flexible measuring unit and a vernier measuring unit are also provided. Among them, the flexible measuring unit is provided with a flexible ruler and a winding tape disc 9. The flexible ruler is connected to the winding tape disc 9, and the winding tape disc 9 is a winding mechanism. The flexible ruler can be tightened under the action of the built-in elastic reset mechanism. It should be noted that the concept of flexibility of the flexible ruler is reflected in the bending performance of the ruler body, and it should be understood as rigid performance in the measuring direction. For details, please refer to the tape measure structure. In order to correctly measure the corresponding length of the mooring system cable 7 after the adjustable frame is adjusted, a flexible ruler in the same direction is set along the side of the mooring system cable 7, so as Figure 1 As shown, a positioning pulley is installed at the joint of the upper horizontal support rod and the side stand, and a flexible scale is connected across the positioning pulley, with the free end fixedly connected to the bottom of the column (or the lower horizontal frame). The outer shell of the winding scale disc 9 is fixed on the upper horizontal support rod. As a result, all adjustment directions (two degrees of freedom, height and width) of the adjustable frame match the measurement path of the flexible measuring unit, so that the flexible measuring unit can quickly read the total length change of the cable path caused by the height and width adjustment during the adjustment process of the adjustable frame, and can directly read the length of the mooring system cable 7 through the end scale 0 mark adjustment compensation (the 0 scale line moves up or down with the end installation position).

[0073] Combination Figure 1 , Fig. 9 and Fig.10As shown, the vernier measuring unit 10 is provided with a vernier ruler 1001 and a cable pointer 1003. The vernier ruler 1001 is a folded edge structure, which is detachably connected to the column or horizontal strut of the adjustable frame. Specifically, a permanent magnet 1002 is installed laterally thereof so that it forms a magnetic attraction structure with the column or horizontal strut, and when it needs to be moved, personnel can operate it manually. The vernier ruler 1001 is fixedly connected to the laterally arranged cable pointer 1003, and the end of the cable pointer 1003 is in a hook shape, and the tip points to the mooring system cable 7 to indicate the position on the cable that needs to be marked. The front of the vernier ruler 1001 is a hollow design, and a protruding main scale pointer 1004 is processed on one side of the hollow part, and a vernier scale line 1005 is marked on the other side. Correspondingly, the main scale line 101 is processed on the column and the horizontal strut, and the main scale line 101 is displayed in the aforementioned hollow part. In combination with the main scale pointer 1004 and the vernier scale line 1005, the current position of the vernier scale 1001 relative to the adjustable frame can be read more accurately through the vernier measurement principle (the same range, the main scale and the vernier scale are divided into different numbers). Since the free end of the flexible measuring unit is fixed to the bottom of the column, and the vernier measuring unit reference is also the column or the horizontal strut, the two measuring paths have a certain correlation on the adjustable frame, and the measuring path coupling is realized. When the operator needs to accurately mark the mooring system cable 7 after calculation, the vernier measuring unit 10 can be adjusted by simple calculation to point out the exact position that needs to be marked. Further, in order to mark more efficiently and accurately, the transmitting end of the laser line projector can also be fixed at the end of the cable pointer 1003, that is, the laser transmitter and lens assembly can be fixedly installed to project a horizontal green line at the position that needs to be marked, which is convenient for the operator to make marks. The advantage of the above design is that it is not necessary to measure the marked position and cut off the mooring system cable 7 after disassembly, and the marking can be performed in the stretched state. This is very important because the length of the mooring system cable 7 will change slightly after disassembly, so it is inconsistent with the calculated length in the tension state; and directly reading the mark through the flexible measuring unit is not accurate enough. Therefore, this embodiment actually realizes a two-level measurement and marking combining rough reading and intensive reading under coupled measurement conditions, and has an adjustable frame measurement function.

[0074] Preferably, the end of the column is located on the positioning plane, and the positioning plane is also provided with a detection end of the tension measuring device. The tension measuring device of this embodiment includes a coaxial tension sensor 5 and a lower computer 11. The coaxial tension sensor 5 is connected to the mooring system cable 7 as a detection end. The lower computer 11 can be installed on the lower horizontal frame of the adjustable frame as a counterweight, and is electrically connected to the coaxial tension sensor 5 for collecting sensor data.

[0075] Optional, such as Figure 1 , Figure 2 and Fig.11As shown, four universal brake rollers 8 are provided at the bottom of the adjustable frame, so that the whole has mobility and maintains good stability.

[0076] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. A pre-tension and length multi-stage retractable adjustment device for a mooring system for a water tank test, characterized in that: It includes an adjustable frame, a tensioning mechanism, a tension measuring device, a flexible measuring unit and at least one set of vernier measuring units; The tensioning mechanism is mounted on the adjustable frame and is provided with a loading mechanism; one end of the mooring system cable is connected to the detection end of the tension measuring device, and the other end is connected to the loading mechanism; The loading mechanism is provided with a multi-input speed-changing gear set, and the output shaft is fixedly connected to the mooring system cable; the input end of the multi-input speed-changing gear set is divided into at least a fine-adjustment input end and a coarse-adjustment input end according to the reduction ratio; The free end and the fixed end of the flexible measuring unit are respectively fixedly connected to different supporting components on the adjustable frame, and all adjustment directions of the adjustable frame match the measuring path of the flexible measuring unit; The vernier measuring unit is detachably connected or slidably connected to the adjustable frame; the main scale lines of the vernier measuring unit are located on the adjustable frame, and the vernier measuring unit is also provided with vernier scale lines; The measuring path of the vernier measuring unit and the measuring path of the flexible measuring unit are coupled.

2. The pre-tension and length multi-stage telescopic adjustment device for a mooring system for a water tank test according to claim 1, characterized in that: The adjustable frame is a square frame structure, and at least a two-degree-of-freedom telescopic mechanism is provided on the support assembly of the adjustable frame; the two-degree-of-freedom telescopic mechanism is also provided with a positioning structure; The two-degree-of-freedom telescopic mechanism comprises a column and a horizontal support rod of the adjustable frame; both the column and the horizontal support rod are telescopic rod structures; The positioning structure includes a positioning hole and a latch; a plurality of the positioning holes are provided on the column and the horizontal support rod; the latch cooperates with the positioning hole; The tensioning mechanism is further provided with a fixed pulley block, the mooring system cable is straddled over the fixed pulley block, and the installation path of the mooring system cable matches at least part of the adjustment direction of the adjustable frame.

3. The pre-tension and length multi-stage telescopic adjustment device for a mooring system for a water tank test according to claim 2, characterized in that: The flexible measuring unit is provided with a flexible scale and a tape-retracting measuring disc, and the flexible scale is connected to the tape-retracting measuring disc; A positioning fixed pulley is provided at the connection between at least one group of the uprights and the horizontal support rods; The free end of the flexible scale is fixedly connected to the end of the column; the reel is fixedly connected to the horizontal support rod; the flexible scale is connected across the positioning fixed pulley; The end of the column is located on a positioning plane, and a detection end of the tension measuring device is also arranged on the positioning plane.

4. The pre-tension and length multi-stage telescopic adjustment device for a mooring system for a water tank test according to claim 2, characterized in that: The telescopic rod structure of the upright column and the horizontal support rod is a nested sliding rod structure; The positioning holes include inner positioning holes and outer positioning holes, and the spacings between the inner positioning holes and the outer positioning holes are not all the same.

5. The pre-tension and length multi-stage telescopic adjustment device for a mooring system for a water tank test according to claim 1, characterized in that: The loading mechanism is also provided with a bidirectional ratchet structure; The bidirectional ratchet structure is coaxially connected to the output shaft of the multi-input speed-changing gear set; A self-locking lever is provided on the operation panel of the loading mechanism, and the self-locking lever is connected to the ratchet pawl of the bidirectional ratchet structure.

6. The pre-tension and length multi-stage telescopic adjustment device for a mooring system for a water tank test according to claim 5, characterized in that: The output shaft of the multi-input speed-changing gear set is coaxially fixedly connected with a coarse adjustment driven gear and a fine adjustment driven gear; A fine-tuning driving gear is coaxially fixedly connected to the input shaft of the fine-tuning input end; A coarse adjustment driving gear is coaxially fixedly connected to the input shaft of the coarse adjustment input end; The fine adjustment driving gear is meshed with the fine adjustment driven gear; the coarse adjustment driving gear is meshed with the coarse adjustment driven gear; The power unit of the loading mechanism is a hand crank or an electric drive mechanism.

7. The pre-tension and length multi-stage telescopic adjustment device for a mooring system for a water tank test according to claim 6, characterized in that: The number of teeth of the ratchet of the bidirectional ratchet structure is the same as the number of teeth of the fine-adjustment driven gear; the gear ratio of the fine-adjustment driven gear to the coarse-adjustment driven gear is 10; The gear ratio of the fine-tuning driven gear to the fine-tuning driving gear is in the range of 10-20; The gear ratio of the coarse adjustment driving gear to the coarse adjustment driven gear is in the range of 3-5.

8. The pre-tension and length multi-stage telescopic adjustment device for a mooring system for a water tank test according to claim 1, characterized in that: The vernier measuring unit is provided with a vernier ruler and a cable pointer; The cable pointer is fixedly connected to the vernier ruler, and its tip is facing the mooring system cable; The end of the cable pointer is also provided with a transmitting end of a laser line projector.

9. The pre-tension and length multi-stage telescopic adjustment device for a mooring system for a water tank test according to claim 1, characterized in that: The tension measuring device comprises a coaxial tension sensor and a lower computer; The lower computer is installed on the adjustable frame.

10. The pre-tension and length multi-stage telescopic adjustment device for a mooring system for a water tank test according to claim 1, characterized in that: A plurality of universal brake rollers are arranged at the bottom of the adjustable frame.

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