Automatic compensation floating experiment device and method for underwater test

Abstract

The invention provides an automatic compensation floating experiment device and method for an underwater test, and the device comprises an automatic compensation device which is installed above a floating water tank, the floating water tank is connected with a suspension water tank through a vibration absorption device, and the suspension water tank is connected with a steel wire rope winding and unwinding device; a water level detection device and a posture detection device are respectively mounted in the floating water tank and the suspension water tank; the automatic compensation device comprises an upper cover, the upper cover is arranged on a mounting shell in a sleeving mode, two sets of crossed ball screws are mounted in the mounting shell, one end of each ball screw is connected with a fixed support, the other end of each ball screw is connected with a servo motor through a coupler, and each ball screw is provided with a flange through a bolt. By adjusting the length of the steel wire rope and the position of the suspension water tank, different cabin parameters are simulated, an underwater explosion test is carried out, the accuracy of test data is effectively improved, the service life of equipment is effectively prolonged, and the scientific research cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of underwater test equipment, and particularly relates to an automatic compensation floating experimental device and method for underwater tests. Background Art

[0002] With the development of technology, the anti-shock and anti-explosion capabilities of ships have become the key to enhancing their combat capabilities and vitality. Before large shipborne equipment is installed on ships, it is necessary to test its anti-shock ability. Traditional underwater test equipment has problems such as unstable posture, being easily affected by shock waves, and being unable to automatically adjust parameters, which affect the accuracy of test data and the service life of the equipment. However, due to the high construction cost of ships, it is impossible to conduct a large number of physical experiments on ships, and simple model experiments cannot accurately reflect the structural characteristics and damage of actual ships. Therefore, it is particularly important to develop an underwater test device that can automatically adjust, stabilize the posture, automatically compensate, and absorb and reduce vibration. Therefore, in the offshore oil production system, strengthening the research and application of offshore flexible pipe armor has great significance for ensuring production safety and improving production efficiency.

[0003] In underwater explosion tests, it is necessary to improve the strength of the designed test equipment to ensure that the equipment can still operate normally under the impact. For anti-shock assessment, there are currently two main types of test equipment: shock testing machines and floating shock platforms (FSP). Among them, shock testing machines simulate the anti-shock tests of small ships and are commonly used in the anti-shock test assessments of small shipborne equipment; the other type of test equipment is the floating shock platform used for the anti-shock test assessments of large shipborne equipment.

[0004] Similar to the installation method on ships, the equipment needs to be installed on a floating shock platform. The assessment content is that during the process of the floating shock platform being affected by underwater explosions to different degrees, the shipborne equipment needs to complete anti-shock tests, and all indicators need to be qualified. For the system construction of floating shock platforms, China currently has various types of floating platforms in different quantities, but the test capabilities do not meet the actual usage requirements of large and medium-sized equipment. Therefore, the current structural types of small and standard floating platforms have limited applicable categories for equipment assessment.

[0005] Existing methods for simulating the shock response of shock platforms have limitations. For example, the method of directly loading shock wave loads on the explosion-facing surface of the flow field to simulate the shock response of the platform under far-field explosion has made up for the deficiencies of finite element software in far-field calculations, but there may be errors in simulations under other complex working conditions; the EMD method is used to filter and analyze the low-frequency errors of the platform acceleration sensor, and its applicability and accuracy may vary under different conditions.

[0006] Shipborne equipment needs to be tested for shock resistance in shock environments such as underwater explosions. The shock response spectrum is a commonly used standard method for equipment testing at home and abroad, and there are different requirements in the specifications of various countries. Accurately obtaining the shock environment is of great significance for the accuracy and reliability of equipment shock resistance testing. Existing measurement methods have deficiencies, such as the influence of zero drift on shock acceleration measurement, etc., and more accurate measurement means are needed. Summary of the Invention

[0007] The purpose of the present invention is to provide an automatic compensation floating experimental device and method for underwater tests, which can realize the automatic adjustment of equipment parameters, the stabilization of posture, automatic compensation, and shock absorption and vibration reduction functions, and improve the accuracy of test data.

[0008] The purpose of the present invention is achieved through the following technical solutions:

[0009] An automatic compensation floating experimental device for underwater tests, comprising: an automatic compensation device, the automatic compensation device is installed above the floating water tank, the floating water tank is connected to the suspension water tank through a shock absorption device, and the suspension water is connected to a wire rope winding and unwinding device;

[0010] A water level detection device and an attitude detection device are respectively installed in the floating water tank and the suspension water tank;

[0011] The automatic compensation device includes an upper cover, the upper cover is sleeved on the housing, two sets of ball screws intersecting crosswise are installed inside the housing, one end of the ball screw is connected to a fixed support, the other end of the ball screw is connected to a servo motor through a coupling, and a flange is installed through a ball screw nut on the ball screw.

[0012] Further, the shock absorption device includes a set of connecting frame one, connecting frame two and a target plate;

[0013] The bottom of the connecting frame one is sleeved outside the through hole of the connecting plate on the upper part of the suspension water tank, and the upper end of the connecting frame one is connected to a hydraulic cylinder;

[0014] The connecting frame two includes a fixing plate installed on the inner wall of the connecting plate, one end of a connecting rod is slidably connected to the groove of the fixing plate, and the other end of the connecting rod is fixedly installed on the through hole seat at the bottom of the automatic compensation device;

[0015] The target plate is installed on the wire rope winding and unwinding device.

[0016] Further, the connecting frame one includes two tripod structures connected by a rotating shaft, and two corners of the tripod structure located at the upper end are respectively connected to the hydraulic cylinder.

[0017] Further, the wire rope retracting and releasing device includes a plate frame, a stepping motor is installed inside the plate frame, the stepping motor is connected to a shaft equipped with a first helical gear through a coupling, the first helical gear meshes with a second helical gear, the second helical gear is installed at one end of a worm, the other end of the worm meshes with a worm gear, the worm gear is installed at one end of a transmission shaft, a second cylindrical gear is installed at the other end of the transmission shaft, the second cylindrical gear meshes with a first cylindrical gear, the first cylindrical gear is fixedly installed on a bevel gear shaft, a first bevel gear on the bevel gear shaft meshes with two second bevel gears, the second bevel gears are respectively installed at one end of a rotating shaft, a winding drum is installed at the other end of each of the two rotating shafts and at both ends of the bevel gear shaft, the winding drums are located outside the plate frame, and a wire rope is wound around the winding drums.

[0018] Further, the lower part of the suspension water tank is provided with 4 heavy-duty lifting rings, and the heavy-duty lifting rings are connected to one end of the wire rope.

[0019] Further, the base of the floating water tank is made of vibration-absorbing material, and the base of the floating water tank has a honeycomb concave-convex surface structure.

[0020] Further, the water level detection device adopts an inductive sensor.

[0021] Further, the attitude detection device adopts a magnetoelectric sensor.

[0022] The present invention may further include:

[0023] An experimental method for the automatic compensation floating experimental device for underwater tests as described above, the method includes:

[0024] The height and attitude of the water level detection device and the attitude detection device in the floating water tank and the suspension water tank are detected in real time by the detection device, and the data is transmitted to the control device. The control device adjusts the water inlet and outlet state of the water tank according to the detection data to keep the water tank at the set height. When the attitude of the water tank is unbalanced, the automatic compensation device is started, and by controlling the displacement of the ball screw nut, the center of gravity of the water tank is adjusted to achieve a rapid recovery of the attitude. At the same time, the shock absorption device absorbs and reduces the impact of the shock wave on the equipment to ensure the accuracy of the test data.

[0025] The beneficial effects of the present invention are as follows:

[0026] By adjusting the length of the wire rope and the position of the suspension water tank, the present invention simulates different cabin parameters for underwater explosion tests. Each device works in coordination to achieve the functions of automatic adjustment of equipment parameters, attitude stability, automatic compensation, and shock absorption and vibration reduction.

[0027] The structure of the present invention is reasonable and the functions are perfect, effectively improving the accuracy of test data and the service life of the equipment, and reducing the scientific research cost.

[0028] The automatic compensation device of the present invention adopts a ball screw drive mechanism, fixed at one end and floatingly supported at the other end, to achieve high-precision linear displacement. By controlling the displacement of the ball screw nut, the center of gravity of the water tank is adjusted to achieve rapid attitude recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Attached Figure 1 is a schematic structural diagram of the present invention.

[0030] Attached Figure 2 is a three-dimensional effect diagram of the present invention.

[0031] Attached Figure 3 is a schematic structural diagram of the automatic compensation device of the present invention.

[0032] Attached Figure 4 is a three-dimensional effect diagram of the automatic compensation device of the present invention.

[0033] Attached Figure 5 is a schematic internal structure diagram of the wire rope winding and unwinding device of the present invention.

[0034] Attached Figure 6 is a three-dimensional effect diagram of the wire rope winding and unwinding device of the present invention.

[0035] Attached Figure 7 is a schematic structural diagram of the steel bevel gear shaft of the present invention.

[0036] Attached Figure 8 is a schematic structural diagram of the vibration absorption device of the present invention.

[0037] In the drawings: 1: Automatic compensation device, 2: Hydraulic cylinder, 3: Connecting frame I, 4: Lower box body, 5: Heavy collar, 6: Wire rope, 7: Target plate, 8: Plate frame, 9: Drum, 10: Connecting frame II;

[0038] 21: Upper cover, 22: Housing, 23: Ball screw, 24: Flange, 25: Coupling, 26: Servo motor, 27: Fixed support;

[0039] 51: Bush, 52: Contact ball bearing, 53: Cylindrical gear I, 54: Flexible coupling, 55: Stepper motor, 56: Transmission shaft, 57: Bearing seat, 58: Bevel gear, 59: Worm gear, 60: Worm, 61: Helical gear I, 62: Helical gear II, 63: Cylindrical gear II. DETAILED DESCRIPTION OF THE INVENTION

[0040] The present invention will be further described below with reference to the accompanying drawings.

[0041] The present invention provides an automatic compensation floating experimental device for underwater tests, as shown in the attached Figure 1-2As shown in the figure, it includes: an automatic compensation device 1, which is installed above the floating water tank 11. The floating water tank 11 is connected to the suspension water tank 4 through a vibration absorption device, and the suspension water tank 4 is connected to a wire rope winding device;

[0042] A water level detection device and an attitude detection device are respectively installed in the floating water tank 11 and the suspension water tank 4, which can sense the height and attitude of the two water tanks underwater.

[0043] As shown in the attached Figure 3-4 As shown in the figure, the automatic compensation device includes an upper cover 21, which is sleeved on the housing 22. Two sets of ball screws 23 that cross each other are installed inside the housing 22. One end of the ball screw 23 is connected to a fixed support 27, and the other end of the ball screw 23 is connected to a servo motor 26 through a coupling. A flange 24 is installed on the ball screw 23 through a ball screw nut.

[0044] The automatic compensation device adopts a ball screw transmission mechanism, with one end fixed and the other end floatingly supported, to achieve high-precision linear displacement. By controlling the displacement of the ball screw nut, the center of gravity of the water tank is adjusted to quickly restore the attitude.

[0045] Preferably, the water level detection device adopts an inductive sensor, and the attitude detection device adopts a magnetoelectric sensor.

[0046] In this embodiment, the base of the floating water tank 11 is made of vibration absorption material, and the base of the floating water tank 11 has a honeycomb concave-convex surface structure to achieve higher shock absorption capacity.

[0047] As shown in the attached Figure 1 、 8 As shown in the figure, the vibration absorption device includes a set of connecting frame 1 3, connecting frame 2 10 and a target plate 7;

[0048] The bottom of the connecting frame 1 3 is sleeved outside the through hole of the connecting plate 12 on the upper part of the suspension water tank 4, and the upper end of the connecting frame 1 3 is connected to the hydraulic cylinder 2.

[0049] The connecting frame 2 10 includes a fixing plate 13 installed on the inner wall of the connecting plate 12. One end of a connecting rod is slidably connected to the groove of the fixing plate 13, and the other end of the connecting rod is fixedly installed in the through hole seat at the bottom of the automatic compensation device.

[0050] The target plate 7 is installed on the wire rope winding device. Specifically, the target plate is installed on the top of the plate frame to simulate the structure of the ship's cabin.

[0051] In this embodiment, the connecting frame 1 3 includes two tripod structures connected by a rotating shaft. Two corners of the tripod structure at the upper end are respectively connected to the hydraulic cylinder 2.

[0052] In this embodiment, the second connecting frame adopts a crank-slider mechanism to achieve high-precision motion conversion and transmission, and has good motion stability.

[0053] Preferably, the hydraulic cylinder 2 adopts four identical small hydraulic cylinders that can perform piston motion to weaken external forces without external oil supply, so as to buffer the impact of shock waves on the water tank; the connecting frame plate adopts a stable triangular structure, and a hollowing-out and weight-reducing design is carried out on it, and it is connected by a hinge connection method, so that the distance between the floating water tank and the suspended water tank can be stably maintained.

[0054] As shown in the atta Figure 5-6 ched figure, the wire rope winding and unwinding device includes a plate frame 8. A stepping motor 55 is installed inside the plate frame 8. The stepping motor 55 is connected to a shaft with a helical gear 61 through a coupling 54. The helical gear 61 meshes with a helical gear 62. The helical gear 62 is installed at one end of a worm 60. The other end of the worm 60 meshes with a worm gear 61. The worm gear 61 is installed at one end of a transmission shaft 56. The other end of the transmission shaft 56 is installed with a cylindrical gear 63. The cylindrical gear 63 meshes with a cylindrical gear 53. The cylindrical gear 53 is fixedly installed on a bevel gear shaft 53. The bevel gear 58 on the bevel gear shaft meshes with two bevel gears 64. The bevel gears 64 are respectively installed at one end of a rotating shaft. The other ends of the two rotating shafts and both ends of the bevel gear shaft are respectively installed with a reel. The reel is located outside the plate frame, and a wire rope 6 is wound around the reel.

[0055] The stepping motor 55 drives the helical gear 61 to rotate through a shaft and a coupling 54. The helical gear 61 drives the helical gear 62 to rotate. The helical gear 62 drives the worm 60 to rotate. The worm 60 drives the worm gear 61 to rotate. The worm gear 61 rotates through the cylindrical gear 63 on the rotating shaft 56. The cylindrical gear 63 drives the cylindrical gear 53 to rotate. The cylindrical gear 53 drives the bevel gear shaft 53 to rotate. The bevel gear 58 drives the bevel gear 64 to rotate, thereby driving the rotating shaft to rotate, and realizing the rotation of the reels at both ends of the bevel gear shaft 53 and the reels 9 on the two rotating shafts, so as to wind and unwind the wire rope 6.

[0056] Both ends of the bevel gear shaft 53 are fixedly connected to the wire rope winding wheel through a key connection. Driven by the motor, a pair of intersecting shafts inside the plate frame rotate synchronously, completing the unified winding and unwinding action of 4 wire ropes. In view of the fact that the attitude of the water tank is prone to imbalance, affecting the stability of the experimental equipment, the automatic compensation device adjusts the unbalanced attitude of the water tank based on the center of gravity adjustment method.

[0057] The wire rope winding and unwinding device adopts a compound drive of gears and worm gears to achieve smooth winding and unwinding of the wire rope. This device includes four-stage transmission: helical gear transmission, worm gear transmission, spur gear transmission, and helical gear transmission, to achieve smooth transmission and multi-stage speed reduction.

[0058] An annular seal is installed outside the bevel gear.

[0059] Preferably, the coupling 54 adopts a diaphragm coupling.

[0060] The lower part of the floating water tank 4 has 4 heavy-duty lifting rings, and the heavy-duty lifting rings are connected to one end of the wire rope.

[0061] In this embodiment, the length of the steel rope and the water inlet and outlet states of the floating water tank are controlled by the control device, so that it can be at the height set in the experiment.

[0062] In this embodiment, the plate frame, the target plate, the steel rope, and the floating water tank form a simulated cabin device, simulating the structure of the ship's cabin. By adjusting the length of the wire rope and the position of the floating water tank, different cabin parameters are simulated for underwater explosion tests.

[0063] This embodiment further includes:

[0064] An experimental method for an automatic compensation floating experimental device for underwater tests as described above, the method includes:

[0065] The water levels in the floating water tank 11 and the suspended water tank 4, the height and attitude of the attitude detection device are detected in real time by the detection device, and the data is transmitted to the control device. The control device adjusts the water inlet and outlet states of the water tank according to the detection data to keep the water tank at the set height. When the attitude of the water tank is unbalanced, the automatic compensation device 1 is activated, and by controlling the displacement of the ball screw nut, the center of gravity of the water tank is adjusted to achieve a rapid recovery of the attitude. At the same time, the shock absorption device absorbs and reduces the impact of the shock wave on the equipment to ensure the accuracy of the test data.

[0066] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An automatic compensation floating experimental device for underwater tests, characterized in that, Comprising: An automatic compensation device (1), which is installed above the floating water tank (11). The floating water tank (11) is connected to the suspended water tank (4) through a vibration absorption device, and the suspended water tank (4) is connected to a wire rope winding and unwinding device; A water level detection device and an attitude detection device are respectively installed in the floating water tank (11) and the suspended water tank (4); The automatic compensation device includes an upper cover (21), the upper cover (21) is sleeved on the housing (22). Two groups of ball screws (23) that cross each other are installed inside the housing (22). One end of the ball screw (23) is connected to a fixed support (27), the other end of the ball screw (23) is connected to a servo motor (26) through a coupling, and a flange (24) is installed on the ball screw (23) through a ball screw nut.

2. The automatic compensation floating experimental device for underwater tests according to claim 1, wherein, The vibration absorption device includes a set of connecting frame one (3), connecting frame two (10) and a target plate (7); The bottom of the connecting frame one (3) is sleeved outside the through hole of the connecting plate (12) on the upper part of the suspended water tank (4), and the upper end of the connecting frame one (3) is connected to a hydraulic cylinder (2); The connecting frame two (10) includes a fixing plate (13) installed on the inner wall of the connecting plate (12). One end of a connecting rod is slidably connected to the groove of the fixing plate (13), and the other end of the connecting rod is fixedly installed in a through hole seat at the bottom of the automatic compensation device; The target plate (7) is installed on the wire rope winding and unwinding device.

3. The automatic compensation floating experimental device for underwater tests according to claim 2, wherein The connecting frame one (3) includes two tripod structures connected by a rotating shaft. Two corners of the upper tripod structure are respectively connected to the hydraulic cylinder (2).

4. The automatic compensation floating experimental device for underwater tests according to claim 3, characterized in that The wire rope winding and unwinding device includes a plate frame (8). A stepping motor (55) is installed inside the plate frame (8). The stepping motor (55) is connected to a shaft installed with a helical gear one (61) through a coupling (54). The helical gear one (61) meshes with a helical gear two (62). The helical gear two (62) is installed at one end of a worm (60). The other end of the worm (60) meshes with a worm gear (61). The worm gear (61) is installed at one end of a transmission shaft (56). The other end of the transmission shaft (56) is installed with a cylindrical gear two (63). The cylindrical gear two (63) meshes with a cylindrical gear one (53). The cylindrical gear one (53) is fixedly installed on a bevel gear shaft (53). The bevel gear one (58) on the bevel gear shaft meshes with two bevel gears two (64). The bevel gears two (64) are respectively installed at one end of a rotating shaft. The other ends of the two rotating shafts and both ends of the bevel gear shaft are respectively installed with a reel. The reels are located outside the plate frame, and a wire rope (6) is wound on the reels.

5. The automatic compensation floating experimental device for underwater tests according to claim 3 or 4, characterized in that, Four heavy lifting rings are provided at the lower part of the suspended water tank (4), and the heavy lifting rings are connected to one end of the wire rope.

6. The automatic compensation floating experimental device for underwater tests according to claim 5, characterized in that, The base of the floating water tank (11) is made of vibration absorption material, and the base of the floating water tank (11) has a honeycomb concave-convex surface structure.

7. The automatic compensation floating experimental device for underwater tests according to claim 1, characterized in that, The water level detection device adopts an inductive sensor.

8. The automatic compensation floating experimental device for underwater tests according to claim 1, characterized in that, The attitude detection device adopts a magnetoelectric sensor.

9. An experimental method for an automatic compensation floating experimental device for underwater tests according to any one of claims 1-8, characterized in that, The method includes: The water level detection device, height and attitude detection device in the floating water tank (11) and the suspended water tank (4) are detected in real time by a detection device, and the data is transmitted to a control device. The control device adjusts the water inlet and outlet states of the water tank according to the detection data to keep the water tank at a set height. When the attitude of the water tank is unbalanced, the automatic compensation device (1) is started, and by controlling the displacement of the ball screw nut, the center of gravity of the water tank is adjusted to quickly restore the attitude. At the same time, the shock absorption device absorbs and reduces the impact of shock waves on the equipment to ensure the accuracy of test data.

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