Experimental device for simulating thread friction wear in marine environment

Abstract

The invention discloses an experimental device for simulating thread friction wear in a marine environment, and relates to the technical field of friction wear experimental equipment, the experimental device comprises an experimental main body, and the experimental main body comprises an experimental upper cover and an experimental cylinder; a motor assembly is fixed on the experiment upper cover, the motor assembly comprises a driving motor, an output shaft of the driving motor is fixedly provided with an upper rotating sleeve, the upper rotating sleeve is internally connected with a male thread test piece through an upper guide rod, two ends of the upper guide rod are slidably connected into the vertical sliding grooves in the two sides respectively, and a spiral spring is arranged at the lower end of the experiment upper cover; a hydraulic system is fixed at the lower end of the experiment barrel and comprises a hydraulic motor, a lower rotating sleeve is fixed on an output shaft of the hydraulic motor, and a female thread test piece is connected into the lower rotating sleeve through a lower connecting pin; the motor assembly and the hydraulic system are both electrically connected with the controller. The device can accurately simulate thread friction wear in a marine corrosion environment, and has the advantages of compact structure, convenience in control and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of friction and wear test equipment, and particularly to a threaded friction and wear test device for simulating the marine environment. Background Art

[0002] Deep sea areas are rich in mineral resources and biological resources, which are of great significance for a country's ocean development and strategic resource reserves. Deep sea submersible drilling rigs are important equipment for carrying out deep sea seabed mineral resource exploration, seabed engineering geological exploration and marine scientific research. To meet the exploration and sampling requirements of deeper seabed strata, a drill pipe library needs to be carried on the submersible drilling rig, and multiple drill pipes are placed in the drill pipe library. The connection between the active drill pipe and the driven drill pipe, and between the drill pipe and the drill tool is through threaded connection. During the drilling process, according to the drilling progress, the drill pipe needs to be continuously connected and disconnected at the active drill pipe. Repeated connection and disconnection of the drill pipe are extremely likely to cause wear of the connection threads of the drill pipe and the drill tool, resulting in the failure and scrapping of the drill pipe and the drill tool.

[0003] Since natural seawater contains various salts and various biological by-products, and at the same time, as the water depth increases, the hydrostatic pressure also increases (for every 100 meters increase in water depth, the hydrostatic pressure increases by about 1 MPa), so the material friction mechanism in the deep sea environment is significantly different from that on land. Therefore, in the process of developing deep sea equipment, it is of crucial significance to deeply explore the material friction mechanism under the special deep sea environment for significantly improving the reliability of deep sea equipment and extending its service life.

[0004] Currently, the existing domestic friction and wear test machines for simulating the marine environment still face many challenges at the technical level, especially the lack of an effective function to simulate the automatic connection and disconnection of threaded connectors in the complex and extreme ultra-high hydrostatic pressure environment of the deep sea. This technical shortcoming seriously restricts the research progress in the field of deep sea engineering. Especially for deep sea equipment such as deep sea submersible drilling rigs and deep sea detectors that widely use threaded connectors, the research on their friction and wear characteristics has been significantly adversely affected in the extreme deep sea environment. Since the existing test machines cannot accurately reproduce the extreme pressure conditions and dynamic connection and disconnection processes of the deep sea, the test data provided deviate significantly from the actual deep sea working conditions, thus hindering the accurate analysis and testing of threaded connectors of deep sea equipment in aspects such as design optimization, material selection, durability assessment and failure mechanism analysis. This not only reduces the performance stability and reliability of deep sea equipment, but also limits the in-depth development and improvement of China's deep sea resource development technology.

[0005] Therefore, developing an advanced friction and wear test machine that can accurately simulate the connection and disconnection conditions of threaded connectors under the ultra-high hydrostatic pressure environment of the deep sea is of crucial strategic significance for promoting the accelerated development of China's deep sea engineering technology and enhancing its international competitiveness. Summary of the Invention

[0006] The object of the present invention is to provide a thread friction and wear experiment device under simulated marine environment to solve the problems existing in the above-mentioned prior art, which is used for simulating the friction and wear experiments of threaded connectors with different sizes under the full-depth marine environment, having good applicability, and being simple and compact in structure, convenient to operate, easy to process and manufacture, and low in cost.

[0007] To achieve the above object, the present invention provides the following solution:

[0008] The present invention discloses a thread friction and wear experiment device under simulated marine environment, including an experiment main body, the experiment main body is placed in a pressure chamber, a pressure medium is filled between the pressure chamber and the experiment main body, the experiment main body includes an experiment upper cover and an experiment cylinder body, the experiment upper cover can be detachably connected to the upper opening of the experiment cylinder body, and a simulation medium is filled inside the experiment cylinder body;

[0009] A motor assembly is fixed on the experiment upper cover, the motor assembly includes a driving motor, the output shaft of the driving motor passes through the experiment upper cover and extends into the experiment cylinder body, an upper rotating sleeve is fixed on the output shaft of the driving motor, a male thread specimen is connected inside the upper rotating sleeve through an upper guide rod, a vertical chute is provided on each of the two sides of the upper rotating sleeve, the two ends of the upper guide rod are respectively slidably connected in the vertical chutes on both sides, a spiral spring is provided at the lower end of the experiment upper cover, and the two ends of the upper guide rod can respectively extend into the spiral tracks on both sides of the spiral spring;

[0010] A hydraulic system is fixed at the lower end of the experiment cylinder body, the hydraulic system includes a hydraulic motor, the hydraulic system can drive the hydraulic motor to rotate, the output shaft of the hydraulic motor passes through the bottom of the experiment cylinder body and extends into the interior of the experiment cylinder body, a lower rotating sleeve is fixed on the output shaft of the hydraulic motor, and a female thread specimen is connected inside the lower rotating sleeve through a lower connecting pin;

[0011] Both the motor assembly and the hydraulic system are electrically connected to a controller.

[0012] Preferably, a proximity switch connecting rod is provided on the lower surface of the experiment upper cover, an upper proximity switch, a middle proximity switch and a lower proximity switch are sequentially arranged on the proximity switch connecting rod from top to bottom, and the upper proximity switch, the middle proximity switch and the lower proximity switch are all electrically connected to the controller;

[0013] A magnetic strip is provided at each of the two ends of the upper guide rod.

[0014] Preferably, a communication pipe is provided on the side wall of the experiment cylinder body, and an experiment cylinder body pressure compensator is provided on the communication pipe.

[0015] Preferably, an electrode assembly is provided at the bottom of the experimental cylinder body. The electrode assembly includes a positive electrode and a negative electrode, and both the positive electrode and the negative electrode are electrically connected to the controller.

[0016] Preferably, the hydraulic system further includes a hydraulic protection shell. A hydraulic circulation pipeline is provided inside the hydraulic protection shell. Both the liquid inlet and outlet of the hydraulic motor are connected to the hydraulic circulation pipeline. The hydraulic circulation pipeline is also provided with a first pressure sensor, a second pressure sensor, an electromagnetic overflow valve, a filter, a check valve, and a third pressure sensor.

[0017] The hydraulic protection shell is filled with a hydraulic protection medium. A hydraulic protection medium delivery pipe is provided on the side wall of the hydraulic protection shell, and a hydraulic pressure compensator is provided on the hydraulic protection medium delivery pipe.

[0018] The hydraulic circulation pipeline is also connected to an oil supply pipeline. One end of the oil supply pipeline away from the hydraulic circulation pipeline is connected to an oil tank, and a hydraulic pump is provided on the oil supply pipeline.

[0019] The first pressure sensor, the second pressure sensor, the third pressure sensor, and the hydraulic pump are all electrically connected to the controller.

[0020] Preferably, the motor assembly further includes a motor protection shell. The drive motor is arranged inside the motor protection shell. The motor protection shell is filled with a motor protection medium. The motor protection shell is connected to a motor protection medium delivery pipe, and a motor pressure compensator is provided on the motor protection medium delivery pipe.

[0021] Preferably, a temperature sensor is installed inside the experimental main body, and the temperature sensor is electrically connected to the controller.

[0022] Preferably, the upper guide rod includes a secondary guide rod. One primary guide rod is provided at each end of the secondary guide rod. A sliding sleeve is sleeved at each end of the secondary guide rod. The sliding sleeve is in contact with the outer surface of the male threaded specimen. A pin is also fixed on the secondary guide rod, and the pin abuts against the sliding sleeve.

[0023] Preferably, a limiting clamp is provided at the lower end of the upper rotating sleeve, and a plurality of stirring rods are evenly distributed in the circumferential direction of the limiting clamp.

[0024] Preferably, a water injection port is provided at the bottom of the experimental cylinder body, and an exhaust hole is provided on the experimental upper cover.

[0025] A lifting ring is further provided at the upper end of the experimental upper cover.

[0026] The present invention has achieved the following technical effects compared with the prior art:

[0027] The present invention can determine the number of positive and reverse rotations required for the driving motor when the male thread specimen and the female thread specimen complete one make-up and break-out operation based on the distance between the initial positions of the male thread specimen and the female thread specimen, the thread length to be tightened between the male thread specimen and the female thread specimen, and the thread pitch, so as to realize the automatic make-up and break-out of the male thread specimen and the female thread specimen, thus creating conditions for truly simulating the friction and wear of thread connections in the deep-sea environment;

[0028] Furthermore, the present invention can precisely control the driving motor and set the number of times for the automatic make-up and break-out of the male thread specimen and the female thread specimen. At the same time, the rotation speed and position of the male thread specimen can be monitored through proximity switches and magnetic strips, so that the working states of various components in the pressure chamber can be supervised, effectively solving the problem that it is difficult to monitor the working conditions in the pressure chamber;

[0029] Furthermore, the male thread specimen of the present invention is connected to the upper rotating sleeve through the upper guide rod, while the female thread specimen is connected to the lower rotating sleeve through the lower connecting pin. Such a design makes the loading and unloading of both very convenient, thus effectively saving the preparation time required for repeated experiments;

[0030] Furthermore, the gap between adjacent turns of the spiral spring of the present invention is greater than the diameter of the first-stage guide rod of the upper guide rod. The lead angle of the spiral spring is equal to the lead angles of the male thread specimen and the female thread specimen. The cross-sectional diameter of the spiral spring is consistent with the thread pitch of the male thread specimen. The lower part of the spring is chamfered. These ingenious designs ensure that the upper guide rod can enter the spiral spring in time before the male thread specimen and the female thread specimen complete the break-out operation, and the upper guide rod can disengage from the spiral spring in time when the male thread specimen and the female thread specimen are just made up, thereby reducing unnecessary friction and wear between the male thread specimen and the female thread specimen during the experiment and ensuring the experimental accuracy;

[0031] Furthermore, the electromagnetic overflow valve provided by the present invention can realize the limit adjustment of the make-up torque, which can provide effective protection for the male thread specimen and the female thread specimen, avoid the phenomena of overload slipping of threads or even fracture, and has a simple and reliable structure and is convenient to adjust;

[0032] Furthermore, the one-way valve provided in the present invention can effectively restrict the rotational movement of the hydraulic motor when the male thread specimen and the female thread specimen perform the break-out operation, ensuring that the female thread specimen will not rotate synchronously with the male thread specimen, thus smoothly and efficiently completing the break-out process;

[0033] Furthermore, the stirring rod of the present invention can stir the water body well underwater, which can not only meet the stirring function but also simulate the undersea ocean current. And it can cleverly avoid interfering with the internal components of the experimental cylinder;

[0034] Furthermore, the present invention is provided with a motor pressure compensator and an oil circuit pressure compensator, which can achieve waterproofing for the drive motor and the hydraulic motor, ensuring the normal operation of the drive motor and the hydraulic motor in the full-depth sea environment;

[0035] The controller of the present invention is placed outside the pressure chamber and is connected to the threaded friction and wear experiment device in the marine environment inside the pressure chamber through a reserved port on the pressure chamber. It has two major functions of control and display. It can set the number of times of screwing on and off for male and female threaded specimens, can adjust the overflow pressure of the electromagnetic overflow valve in real time, can display experimental parameters such as the temperature, pressure, rotation speed of the upper rotating sleeve, number of screwing on and off, unscrewing torque, and screwing on torque in the experimental cylinder body, and can conduct visual management of the experimental process;

[0036] Finally, the present invention also has the advantages of simple structure, reliable function, convenient operation, easy processing and manufacturing, low cost, etc. It can simulate any real marine environment such as ultra-high pressure, seabed sediment, ocean current, etc., and thus can accurately simulate the threaded friction and wear mechanism in the marine environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0038] Figure 1 It is a schematic diagram of the principle of the threaded friction and wear experiment device for simulating the marine environment in the embodiment of the present invention;

[0039] Figure 2 It is a schematic diagram of the structure of the experimental main body in the threaded friction and wear experiment device for simulating the marine environment in the embodiment of the present invention;

[0040] Figure 3 It is a schematic diagram of the connection between the upper rotating sleeve and the upper guide rod in the threaded friction and wear experiment device for simulating the marine environment in the embodiment of the present invention;

[0041] In the figure: 1 - Controller; 2 - Pressure chamber cover; 3 - Pressure chamber cylinder; 4 - Upper proximity switch; 5 - Middle proximity switch; 6 - Lower proximity switch; 7 - Experimental cylinder pressure compensator; 8 - Female threaded specimen; 9 - Electrode assembly; 10 - Lower rotating sleeve; 11 - Hydraulic system; 11.1 - Hydraulic motor; 11.2 - First pressure sensor; 11.3 - Check valve; 11.4 - Filter; 11.5 - Electro-hydraulic relief valve; 11.6 - Second pressure sensor; 11.7 - Third pressure sensor; 12 - Motor assembly; 13 - Upper rotating sleeve; 14 - Experimental upper cover; 15 - Experimental cylinder; 16 - Male threaded specimen; 17 - Temperature sensor; 18 - Motor fixing bolt; 19 - Lifting ring; 20 - Water injection port; 21 - Exhaust port; 22 - Magnetic strip; 23 - Upper guide rod; 23.1 - Plug; 23.2 - Secondary guide rod; 23.3 - Primary guide rod; 23.4 - Sliding sleeve; 24 - Helical spring; 25 - Stirring rod; 26 - Lower connecting pin; 27 - Limit clamp; 28 - Motor pressure compensator; 29 - Hydraulic pressure compensator. Specific implementation manner

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0043] The purpose of the present invention is to provide a threaded friction and wear experiment device for simulating the marine environment to solve the problems existing in the above-mentioned prior art, which is used for simulating the friction and wear experiments of threaded connectors of different sizes in the full-depth marine environment, has good applicability, and is simple and compact in structure, convenient to operate, easy to process and manufacture, and low in cost.

[0044] To make the above-mentioned objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0045] As Figures 1 - 3As shown in the figure, this embodiment provides an experimental device for simulating screw friction and wear in a marine environment, including an experimental main body placed in a pressure chamber. A pressure medium is filled between the pressure chamber and the experimental main body. The pressure medium can be water, gas, etc., and is used to apply pressure to the experimental main body to simulate the pressure around the seabed. The pressure chamber includes a pressure chamber lid 2 and a pressure chamber cylinder 3. The pressure chamber lid 2 can be installed and sealed at the upper opening of the pressure chamber cylinder 3, so that a sealed environment is formed inside the pressure chamber. And a pressure medium delivery pipe can be provided on the side wall of the pressure chamber for delivering the pressure medium. The experimental main body includes an experimental upper lid 14 and an experimental cylinder 15. The experimental upper lid 14 can be detachably connected to the upper opening of the experimental cylinder 15, and the experimental upper lid 14 and the experimental cylinder 15 are fixedly connected by bolts and nuts. The inside of the experimental cylinder 15 is filled with a simulation medium, and the simulation medium can be water.

[0046] A motor assembly 12 is fixed on the experimental upper lid 14. The motor assembly 12 includes a driving motor, and the driving motor is fixed on the upper surface of the experimental upper lid 14 by motor fixing bolts 18. The output shaft of the driving motor extends downward through the experimental upper lid 14 and into the experimental cylinder 15. An upper rotating sleeve 13 is fixed on the output shaft of the driving motor. The upper rotating sleeve 13 is a cylindrical structure. The upper end of the upper rotating sleeve 13 is fixedly connected to the output shaft of the driving motor. The lower end of the upper rotating sleeve 13 is an open end. A male threaded specimen 16 is connected inside the upper rotating sleeve 13 through an upper guide rod 23. The upper guide rod 23 horizontally passes through the male threaded specimen 16 and the upper rotating cylinder. A vertical chute is provided on each side of the upper rotating sleeve 13, and the two ends of the upper guide rod 23 are respectively slidably connected in the vertical chutes on both sides. In addition, a spiral spring 24 is provided at the lower end of the experimental upper lid 14, and the two ends of the upper guide rod 23 can respectively extend into the spiral tracks on both sides of the spiral spring 24.

[0047] A hydraulic system 11 is fixed at the lower end of the experimental cylinder 15. The hydraulic system 11 includes a hydraulic motor 11.1, and other components in the hydraulic system 11 can drive the hydraulic motor 11.1 to rotate. The output shaft of the hydraulic motor 11.1 extends upward through the bottom of the experimental cylinder 15 and into the interior of the experimental cylinder 15. A lower rotating sleeve 10 is fixed on the output shaft of the hydraulic motor 11.1. The lower rotating sleeve 10 is also a cylindrical structure. The lower end of the lower rotating sleeve 10 is connected to the output shaft of the hydraulic motor 11.1, and the upper end of the lower rotating sleeve 10 is an open end. A female threaded specimen 8 is connected inside the lower rotating sleeve 10 through a lower connecting pin 26. The lower connecting pin 26 horizontally passes through the female threaded specimen 8 and the lower rotating sleeve 10 to realize the fixed connection between the lower rotating sleeve 10 and the female threaded specimen 8.

[0048] In addition, both the motor assembly 12 and the hydraulic system 11 are electrically connected to the controller 1. The controller 1 can be an existing control cabinet or computer, and the controller 1 is arranged outside the pressure chamber. For the motor assembly 12, the hydraulic system 11, and other devices that need to be connected to the controller 1 through wires, their connecting wires will pass through the pressure chamber and the experimental main body. Therefore, it is easy to think that there are wire through-holes on the pressure chamber and the experimental main body for the wires to pass through.

[0049] During actual use, corresponding fluid media can be added into the pressure chamber and the experimental main body to simulate the seabed environment. The upper rotating sleeve 13 is connected to the male threaded specimen 16 through the upper guide rod 23, and the lower rotating sleeve 10 is connected to the female threaded specimen 8 through the lower connecting pin 26. The male threaded specimen 16 and the female threaded specimen 8 are rotationally driven by the driving motor and the hydraulic motor 11.1 to complete the threading connection and disassembly process between the two, which is convenient for experimental research.

[0050] In this embodiment, a proximity switch connecting rod is provided on the lower surface of the experimental upper cover 14. The proximity switch connecting rod is successively provided with an upper proximity switch 4, a middle proximity switch 5, and a lower proximity switch 6 from top to bottom, and the distances between the upper proximity switch 4, the middle proximity switch 5, and the lower proximity switch 6 are the same. The upper proximity switch 4, the middle proximity switch 5, and the lower proximity switch 6 are all electrically connected to the controller 1 and can transmit the detection signals to the controller 1 in a timely manner, and the controller 1 collects and analyzes the data.

[0051] Both ends of the upper guide rod 23 are respectively provided with a magnetic strip 22. The length of the magnetic strip 22 is less than the distance between the upper proximity switch 4 and the middle proximity switch 5 (or between the middle proximity switch 5 and the lower proximity switch 6). The function of the magnetic strip 22 is to trigger the upper proximity switch 4, the middle proximity switch 5, or the lower proximity switch 6. Then the upper proximity switch 4, the middle proximity switch 5, or the lower proximity switch 6 can transmit the corresponding position signals to the controller 1. In this way, we can know the specific position of the male threaded specimen 16 in real time.

[0052] [[ID=…]]In this embodiment, a communication pipe is provided on the side wall of the experimental cylinder 15, and an experimental cylinder pressure compensator 7 is provided on the communication pipe. The communication pipe realizes the communication between the pressure chamber and the inside of the experimental main body, and the experimental cylinder pressure compensator 7 can make the pressure in the experimental cylinder 15 always consistent with the pressure in the pressure chamber. The experimental cylinder pressure compensator 7 can adopt an existing pressure compensation valve.

[0053] In this embodiment, an electrode assembly 9 is provided at the bottom of the experimental cylinder body 15. The electrode assembly 9 includes a positive electrode and a negative electrode. Both the positive electrode and the negative electrode are electrically connected to the controller 1 through wires. In addition, the positive electrode and the negative electrode can also be connected to a power source through wires to provide electrical energy for them. The reason for setting the positive electrode and the negative electrode is to accelerate the corrosion rate of the male threaded specimen 16 and the female threaded specimen 8, which can not only simulate the real seabed corrosion situation but also accelerate the experimental progress. To prevent the relevant experimental parts from being corroded and damaged during the experiment, an anti-corrosion coating is applied to the upper experimental cover 14, the inner wall of the experimental cylinder body 15, and all the components inside the experimental cylinder body 15 except the male threaded specimen 16 and the female threaded specimen 8 before the experiment.

[0054] In this embodiment, the hydraulic system 11 further includes a hydraulic protection shell, which is fixed to the lower end of the experimental cylinder body 15. A hydraulic circulation pipeline is provided inside the hydraulic protection shell. Both the inlet and outlet ports of the hydraulic motor 11.1 are connected to the hydraulic circulation pipeline. The hydraulic circulation pipeline is also provided with a first pressure sensor 11.2, a second pressure sensor 11.6, an electromagnetic overflow valve 11.5, a filter 11.4, a check valve 11.3, and a third pressure sensor 11.7. Among them, the first pressure sensor 11.2, the second pressure sensor 11.6, and the third pressure sensor 11.7 are all used to detect the pressure values at various positions in the hydraulic circulation pipeline. The electromagnetic overflow valve 11.5 is an existing direct-acting proportional overflow valve. The electromagnetic overflow valve 11.5 can be used to limit the maximum pressure value in the hydraulic circulation pipeline. When the pressure in the hydraulic circulation pipeline exceeds the set maximum pressure value, the electromagnetic overflow valve 11.5 will relieve the pressure and overflow part of the oil to the fuel tank. The filter 11.4 is used to filter the hydraulic oil to prevent impurities in the hydraulic oil from entering the hydraulic motor 11.1 and affecting the service life of the hydraulic motor 11.1. It should be emphasized that the check valve 11.3 can limit the flow direction of the hydraulic oil in the hydraulic circulation pipeline. As Figure 1 shown, when the hydraulic oil in the hydraulic circulation pipeline flows counterclockwise, it is set that the hydraulic motor 11.1 rotates forward at this time; when the hydraulic oil in the hydraulic circulation pipeline flows clockwise, the hydraulic oil between the hydraulic motor 11.1 and the check valve 11.3 can be compressed briefly at this time. Therefore, the hydraulic motor 11.1 can rotate counterclockwise for a few turns (but not many). When the hydraulic oil between the hydraulic motor 11.1 and the check valve 11.3 cannot be compressed, the check valve 11.3 cannot allow the hydraulic oil to flow through, and at this time, the hydraulic motor 11.1 cannot rotate.

[0055] The hydraulic protection shell is filled with a hydraulic protection medium, which can be hydraulic oil or other fluid media. The side wall of the hydraulic protection shell is provided with a hydraulic protection medium delivery pipe, and a hydraulic pressure compensator 29 is arranged on the hydraulic protection medium delivery pipe. The hydraulic pressure compensator 29 can be an existing pressure compensation valve, so that the pressure values at both ends of the hydraulic protection medium delivery pipe are kept consistent, and the external hydraulic oil can be transported into the hydraulic protection shell through the hydraulic protection medium delivery pipe. The reason for filling the hydraulic protection shell with hydraulic oil is to maintain the pressure balance between the inside of the hydraulic protection shell and the pressure chamber, and avoid the problem that the hydraulic protection shell is damaged due to the pressure difference between the hydraulic protection shell and the pressure chamber.

[0056] The hydraulic circulation pipeline is also connected with an oil supply pipeline. The oil outlet end of the oil supply pipeline is connected between the filter 11.4 and the electromagnetic overflow valve 11.5. One end of the oil supply pipeline far away from the hydraulic circulation pipeline is connected with an oil tank, and a hydraulic pump is arranged on the oil supply pipeline. Through the hydraulic pump, the hydraulic oil in the oil tank can be transported between the filter 11.4 and the electromagnetic overflow valve 11.5.

[0057] The first pressure sensor 11.2, the second pressure sensor 11.6, the third pressure sensor 11.7 and the hydraulic pump are all electrically connected to the controller 1. The controller 1 uniformly collects relevant data and controls the operation of each component.

[0058] In this embodiment, the motor assembly 12 further includes a motor protection shell, which is fixed on the upper surface of the experimental upper cover 14, and the driving motor is arranged inside the motor protection shell. The motor protection shell is filled with a motor protection medium, which can be hydraulic oil. The motor protection shell is connected with a motor protection medium delivery pipe, and a motor pressure compensator 28 is arranged on the motor protection medium delivery pipe. The motor pressure compensator 28 is an existing pressure compensation valve, which is used to maintain the pressure balance at both ends of the motor protection medium delivery pipe. The purpose of filling the motor protection shell with the motor protection medium is also to protect the motor protection shell and avoid the problem that the motor protection shell is damaged due to too large a pressure difference inside and outside the motor protection shell.

[0059] In this embodiment, a temperature sensor 17 is installed inside the experimental main body, and the temperature sensor 17 is electrically connected to the controller 1. The temperature sensor 17 is used to monitor the internal temperature of the experimental main body in real time and transmit the temperature data to the controller 1.

[0060] In this embodiment, the upper guide rod 23 includes a secondary guide rod 23.2. The length of the secondary guide rod 23.2 is greater than the outer diameter of the upper rotating sleeve 13. The middle of the secondary guide rod 23.2 passes through the radial hole of the male-threaded specimen 16 and is in clearance fit with the radial hole. One primary guide rod 23.3 is provided at each end of the secondary guide rod 23.2. The diameter of the secondary guide rod 23.2 is slightly larger than that of the primary guide rod 23.3. The diameter of the primary guide rod 23.3 is slightly smaller than the pitch of the helical spring 24, so that one end of the primary guide rod 23.3 away from the secondary guide rod 23.2 can pass through the helical spring 24 and is connected with a magnetic strip 22. The length of the primary guide rod 23.3 is slightly greater than half of the difference between the outer diameter of the helical spring 24 and the outer diameter of the upper rotating sleeve 13. One sliding sleeve 23.4 is sleeved at each end of the secondary guide rod 23.2. The length of the sliding sleeve 23.4 is equal to half of the difference between the inner and outer diameters of the upper rotating sleeve 13. The inner diameter of the sliding sleeve 23.4 is equal to or slightly larger than the diameter of the secondary guide rod 23.2 to fix the sliding sleeve 23.4. The outer diameter of the sliding sleeve 23.4 is slightly smaller than the width of the vertical chute, and the sliding sleeve 23.4 is in contact with the outer surface of the male-threaded specimen 16 to limit the axial direction of the upper guide rod 23. A vertical pin 23.1 is also fixed on the secondary guide rod 23.2. The pin 23.1 abuts against the sliding sleeve 23.4 to limit the axial direction of the sliding sleeve 23.4. Finally, the sliding sleeve 23.4 is limited by the pin 23.1 and the outer surface of the male-threaded specimen 16 together to prevent its axial sliding.

[0061] The lead angle of the helical spring 24 is equal to or close to the lead angles of the male-threaded specimen 16 and the female-threaded specimen 8. The cross-sectional diameter of the helical spring 24 is consistent with the pitch of the male-threaded specimen 16. The lower end of the helical spring 24 is chamfered.

[0062] During actual use, when the driving motor drives the upper rotating sleeve 13 to rotate, the upper rotating sleeve 13 will drive the upper guide rod 23 to rotate together. Since the primary guide rods 23.3 at both ends of the upper guide rod 23 will pass through both sides of the helical spring 24, the primary guide rod 23.3 will move downward along the helical spring 24 while making a rotational motion, thereby driving the male-threaded specimen 16 to move downward while making a rotational motion.

[0063] In this embodiment, a limit clamp 27 is provided at the lower end of the upper rotating sleeve 13. A plurality of stirring rods 25 are evenly distributed in the circumferential direction of the limit clamp 27. When the upper rotating sleeve 13 rotates, the stirring rods 25 can stir the water body well underwater, which can not only meet the stirring function, but also simulate the seabed ocean current, and can cleverly avoid the mutual interference with the internal components of the experimental cylinder 15.

[0064] In this embodiment, a water injection port 20 is provided at the bottom of the experimental cylinder body 15, and water is injected into the experimental main body through the water injection port 20. An exhaust hole is provided on the experimental upper cover 14, and the gas in the experimental main body will flow out from the exhaust hole.

[0065] A lifting ring 19 is further provided at the upper end of the experimental upper cover 14, and the experimental main body can be carried through the lifting ring 19.

[0066] This embodiment also provides a method for using a threaded friction and wear experiment device under a simulated marine environment, including the following steps:

[0067] Step 1: First, assemble the male threaded specimen 16 that needs to undergo a friction and wear experiment under a marine environment on the upper rotating sleeve 13 through the upper guide rod 23, and assemble the female threaded specimen 8 on the lower rotating sleeve 10 through the lower connecting pin 26. Close the experimental upper cover 14, then inject seawater into the experimental cylinder body 15 from the water injection port 20, and at the same time open the exhaust port 21 to evacuate the air in the experimental cylinder body 15. After the experimental cylinder body 15 is filled with seawater, close the water injection port 20 and the exhaust port 21. Through the lifting ring 19, place the entire device into the pressure chamber. Connect the drive motor, upper proximity switch 4, middle proximity switch 5, lower proximity switch 6, temperature sensor 17, electrode assembly 9, hydraulic motor 11.1, first pressure sensor 11.2, second pressure sensor 11.6, third pressure sensor 11.7, one-way valve 11.3, filter 11.4, electromagnetic relief valve 11.5 to the controller 1 through the reserved ports such as the power cable and sensor cable reserved on the pressure chamber cover 2. Cover the pressure chamber cover 2, and fill the pressure chamber with a pressure medium to apply pressure until the pressure value required for the experiment is reached.

[0068] Step 2: After setting the number of make and break operations, the make-up torque, and the break-out torque on the male thread specimen 16 and the female thread specimen 8 through the controller 1, start the drive motor. The drive motor drives the upper rotating sleeve 13 to rotate, and the stirring rod 25 installed at the limit clamp 27 rotates the seawater in the mixing cylinder accordingly. The upper guide rod 23 makes a rotational motion along the helical spring 24 driven by the upper rotating sleeve 13, and at the same time moves downward along the vertical chute. Driven by the upper guide rod 23, the male thread specimen 16 makes a rotational motion downward together. When the male thread specimen 16 contacts the female thread specimen 8, the male and female thread specimens 8 start to make up. When the first pressure sensor, the second pressure sensor 11.6, and the third pressure sensor 11.7 detect the pressure corresponding to the preset make-up torque value (which means the make-up is completed at this time), the electromagnetic overflow valve 11.5 immediately discharges the flow. At the same time, the hydraulic motor 11.1 and the drive motor work together and start to rotate synchronously. Driven by the hydraulic motor 11.1, the lower rotating sleeve 10 transmits the rotational motion to the female thread specimen 8, and the female thread specimen 8 and the male thread specimen 16 rotate at the same speed and in the same direction, so as to prevent the tightening torque from exceeding the set torque value when the male thread specimen 16 and the female thread specimen 8 are made up, thereby reducing unnecessary friction and wear between the male thread specimen 16 and the female thread specimen 8 during the experiment, and at the same time preventing the hydraulic circulation pipeline from being overloaded and damaging each electrical component. At this time, the first-stage guide rod 23.3 completely slides out of the helical spring 24, and the upper guide rod 23 is completely separated from the helical spring 24.

[0069] Step 3: After the male thread specimen 16 and the female thread specimen 8 are made up, the lower end of the magnetic strip 22 contacts the lower proximity switch 6 at this time, and the drive motor starts to reverse. The hydraulic motor 11.1 immediately reverses with it, and the oil in the hydraulic system 11 also flows reversely accordingly. Limited by the one-way valve 11.3, the pressure value in the hydraulic system 11 becomes larger and larger. When the pressure value reaches the pressure corresponding to the break-out torque, the hydraulic motor 11.1 stops rotating, and the male thread specimen 16 and the female thread specimen 8 start to break out under the drive of the drive motor. At this time, the first-stage guide rod 23.3 starts to slide into the helical spring 24. As the upper guide rod 23 continuously rotates along the helical spring 24, the upper guide rod 23 slowly rises along the vertical chute. Driven by the upper guide rod 23, the male thread specimen 16 rotates and rises to complete the break-out with the female thread specimen 8. When the upper end of the upper guide rod 23 rises to contact the upper proximity switch 4 with the magnetic strip 22, the reverse rotation of the drive motor stops, and one break-out of the male thread specimen 16 and the female thread specimen 8 is completed. Immediately, the drive motor starts to rotate forward, and so on until the number of make and break operations of the male thread specimen 16 and the female thread specimen 8 set before the experiment is completed.

[0070] Step 4: During the experiment, the display of the controller 1 will show experimental data such as the number of make-and-break operations of the male threaded specimen 16 and the female threaded specimen 8, the remaining number of make-and-break operations of the male threaded specimen 16 and the female threaded specimen 8, the make-up torque, the break-out torque, the number of forward and reverse rotations of the drive motor, the pressure value in the pressure chamber, and the temperature inside the experimental main body.

[0071] In the present invention, specific examples are used to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. An experimental device for simulating screw friction and wear in a marine environment, characterized in that: It includes an experimental main body, which is placed in a pressure chamber. A pressure medium is filled between the pressure chamber and the experimental main body. The experimental main body includes an experimental upper cover and an experimental cylinder body. The experimental upper cover can be detachably connected to the upper opening of the experimental cylinder body. The interior of the experimental cylinder body is filled with a simulation medium; A motor assembly is fixed on the experimental upper cover. The motor assembly includes a driving motor. The output shaft of the driving motor passes through the experimental upper cover and extends into the experimental cylinder body. An upper rotating sleeve is fixed on the output shaft of the driving motor. A male-threaded specimen is connected in the upper rotating sleeve through an upper guide rod. A vertical chute is provided on each side of the upper rotating sleeve. The two ends of the upper guide rod are respectively slidably connected in the vertical chutes on both sides. A spiral spring is provided at the lower end of the experimental upper cover. The two ends of the upper guide rod can respectively extend into the spiral tracks on both sides of the spiral spring; A hydraulic system is fixed at the lower end of the experimental cylinder body. The hydraulic system includes a hydraulic motor. The hydraulic system can drive the hydraulic motor to rotate. The output shaft of the hydraulic motor passes through the bottom of the experimental cylinder body and extends into the interior of the experimental cylinder body. A lower rotating sleeve is fixed on the output shaft of the hydraulic motor. A female-threaded specimen is connected inside the lower rotating sleeve through a lower connecting pin; Both the motor assembly and the hydraulic system are electrically connected to a controller.

2. The simulated marine environment thread friction and wear experimental device according to claim 1, wherein: A proximity switch connecting rod is provided on the lower surface of the experimental upper cover. An upper proximity switch, a middle proximity switch and a lower proximity switch are sequentially arranged on the proximity switch connecting rod from top to bottom. The upper proximity switch, the middle proximity switch and the lower proximity switch are all electrically connected to the controller; A magnetic strip is provided at each end of the upper guide rod.

3. The experimental device for screw thread friction and wear under simulated marine environment according to claim 1, wherein: A communication pipe is provided on the side wall of the experimental cylinder body. An experimental cylinder body pressure compensator is provided on the communication pipe.

4. The experimental device for screw friction and wear under simulated marine environment according to claim 1, wherein: An electrode assembly is provided at the bottom of the experimental cylinder body. The electrode assembly includes a positive electrode and a negative electrode. Both the positive electrode and the negative electrode are electrically connected to the controller.

5. The experimental device for screw thread friction and wear under simulated marine environment according to claim 1, characterized in that: The hydraulic system further includes a hydraulic protection shell. A hydraulic circulation pipeline is provided inside the hydraulic protection shell. The two liquid inlet and outlet ports of the hydraulic motor are both connected to the hydraulic circulation pipeline. A first pressure sensor, a second pressure sensor, an electromagnetic overflow valve, a filter, a one-way valve and a third pressure sensor are further provided on the hydraulic circulation pipeline; The hydraulic protection shell is filled with a hydraulic protection medium. A hydraulic protection medium delivery pipe is provided on the side wall of the hydraulic protection shell. A hydraulic pressure compensator is provided on the hydraulic protection medium delivery pipe; The hydraulic circulation pipeline is further connected to an oil supply pipeline. One end of the oil supply pipeline away from the hydraulic circulation pipeline is connected to an oil tank. A hydraulic pump is provided on the oil supply pipeline; The first pressure sensor, the second pressure sensor, the third pressure sensor and the hydraulic pump are all electrically connected to the controller.

6. The experimental device for screw thread friction and wear under simulated marine environment according to claim 1, wherein: The motor assembly further includes a motor protection housing, the drive motor is arranged inside the motor protection housing, the inside of the motor protection housing is filled with a motor protection medium, the motor protection housing is connected with a motor protection medium delivery pipe, and a motor pressure compensator is arranged on the motor protection medium delivery pipe.

7. The simulated marine environment thread friction and wear experimental device according to claim 1, wherein: A temperature sensor is installed inside the experimental main body, and the temperature sensor is electrically connected to the controller.

8. The experimental device for screw thread friction and wear under simulated marine environment according to claim 1, characterized in that: The upper guide rod includes a secondary guide rod, one primary guide rod is arranged at each end of the secondary guide rod, a sliding sleeve is sleeved at each end of the secondary guide rod, the sliding sleeve is in contact with the outer surface of the male threaded specimen, and a bolt is further fixed on the secondary guide rod, and the bolt abuts against the sliding sleeve.

9. The experimental device for screw thread friction and wear under simulated marine environment according to claim 1, characterized in that: A limiting clamp is arranged at the lower end of the upper rotating sleeve, and a plurality of stirring rods are evenly distributed in the circumferential direction of the limiting clamp.

10. The experimental device for screw thread friction and wear under simulated marine environment according to claim 1, characterized in that: A water injection port is arranged at the bottom of the experimental cylinder body, and an exhaust hole is arranged on the experimental upper cover; A hanging ring is further arranged at the upper end of the experimental upper cover.

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