Tension and compression test device for simulating marine environment

Abstract

The tension and compression test device for simulating the marine environment comprises a test workpiece, a tension and compression device and a water pressure device, the tension and compression device comprises a tension and compression system and a tension cylinder, the top of the tension cylinder is provided with a tension nut extending into the tension cylinder, the bottom end of the test workpiece is in threaded connection with the top of the tension nut, and the tension and compression system applies axial acting force to the bottom end of the tension nut so as to perform tension and compression test on the test workpiece; the water pressure device comprises a water pressure system and a container, the container is connected with the tension cylinder, the top end of the test workpiece is mounted at the top of the container, and the water pressure system provides a simulated ocean system in the container and is used for carrying out corrosion test on the test workpiece. According to the utility model, tension and compression tests and water pressure tests under different working conditions can be simultaneously carried out, the corrosion performance and the mechanical performance of a tested workpiece in a marine environment are detected, the service life is evaluated, and the test efficiency of the corrosion resistance and the deformation resistance of a material is improved.

Description

Technical Field

[0001] The utility model relates to a workpiece testing device, in particular to a tension and compression testing device for simulating a marine environment. Background Art

[0002] The marine environment is one of the most harsh environments for corrosion in nature, and most metals are not resistant to seawater and marine atmosphere corrosion. Threaded fasteners are a widely used type of mechanical parts, often used for connection and locking. Their fit is generally clearance fit, and they are prone to crevice corrosion when exposed to the marine environment for a long time, making them difficult to disassemble, reducing the connection strength, and even losing strength, which makes it very difficult for the fasteners to serve and maintain normally.

[0003] The outboard threaded joint of the threaded rudder transmission device is subjected to alternating large loads for a long time, and the thread is in a state of repeated compression and tensile deformation. During long-term use, stress concentration and stress changes will occur, which are prone to problems such as crack extension, fracture, and cross-sectional deformation of the thread, resulting in fatigue failure at the threaded connection. In the marine environment, the threaded joint will be affected by the pressure of seawater and seawater corrosion. Working in the marine environment for a long time will cause the metal material on the surface of the thread to be corroded, causing surface corrosion, oxidation or corrosion holes, etc., thereby weakening the strength and sealing performance of the thread. Prolonging the service life of the threaded joint is of great significance for reducing material waste and improving the environment. Most traditional devices only perform tension and compression tests or only perform water pressure simulations, and there is no test device that can perform tension and water pressure tests at the same time. In view of this, it is particularly important to design a test device for the threaded joint structure that simulates the marine environment. Utility Model Content

[0004] In order to solve the above problems, the utility model proposes a tension and compression test device simulating the marine environment, and the specific technical solution is as follows:

[0005] A tension and compression test device for simulating a marine environment, comprising:

[0006] Test artifacts;

[0007] The tension and compression device at least comprises a tension and compression system and a tension cylinder, wherein the top of the tension cylinder is provided with a tension nut extending into the interior thereof, the bottom end of the test workpiece is threadedly connected to the top of the tension nut, and the tension and compression system applies an axial force to the bottom end of the tension nut to perform tension and compression tests on the test workpiece;

[0008] The hydraulic device at least includes a hydraulic system and a container, wherein the container is connected to a tension cylinder, the test workpiece is located in the container, and the top of the test workpiece is installed on the top of the container, and the hydraulic system provides a simulated marine system in the container for performing corrosion testing on the test workpiece.

[0009] Furthermore, the tension and compression system is a hydraulic system, a piston matching the tension cylinder is provided at the bottom of the tension nut, and the hydraulic system applies axial force to both sides of the piston through hydraulic oil.

[0010] Furthermore, the piston divides the tension cylinder into an upper chamber and a lower chamber, and the tension cylinder is provided with oil connection ports for connecting the upper chamber and the lower chamber with the hydraulic system.

[0011] Furthermore, the tension cylinder is provided with a top cover threadedly connected thereto, and the stretching nut is threadedly connected to the piston.

[0012] Furthermore, the container is provided with a base and a detachably connected top seat, and the outer ring of the base is symmetrically provided with a plurality of long screws for being detachably connected to the top seat.

[0013] Furthermore, a water inlet and a water outlet for connecting the container with a water pressure system are respectively provided on the top seat and the base of the container.

[0014] Furthermore, the base of the container is detachably connected to the top of the tension cylinder via a socket head screw.

[0015] Furthermore, the top of the test workpiece extends out of the top seat and is locked on the top seat by a locking nut.

[0016] Furthermore, a sealing ring is provided between the outer circumference of the stretching nut and the top of the tension cylinder.

[0017] Furthermore, the tension and compression system and the water pressure system are both electrically connected to a controller for adjusting and controlling the working parameters of the simulated ocean environment.

[0018] Beneficial effects:

[0019] The utility model can simultaneously carry out tension and compression tests and water pressure tests under different working conditions, simulate the marine working environment of the outboard threaded joint, detect the corrosion performance and mechanical properties of the test workpiece, thereby facilitating the life evaluation of each component and improving the testing efficiency of the material's corrosion resistance and deformation resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an overall schematic diagram of the utility model.

[0021] Figure 2 It is a cross-sectional view of the utility model.

[0022] In the figure: 1 test workpiece; 2 tension cylinder, 21 upper chamber, 22 lower chamber, 23 top cover, 24 tension nut, 25 oil circuit connection port, 26 connection groove, 27 piston; 3 container, 31 base, 32 top seat, 33 water inlet, 34 water outlet, 35 long screw, 36 connecting nut; 4 socket head screw; 5 locking nut; 6 sealing ring. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0024] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present application, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0025] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 mechanical connection, an electrical connection, or mutual communication; 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 this application can be understood according to specific circumstances.

[0026] like Figure 1 , 2 As shown, a tensile and compressive test device for simulating a marine environment comprises a test workpiece 1, a tensile and compressive device and a water pressure device; wherein:

[0027] The test workpiece 1 is an outboard threaded joint of a threaded rudder transmission device, and both the bottom and top ends thereof are external threaded ports. In the actual use environment, the threads of the threaded joint are subjected to repeated compression and tension forces, and the surface of the threaded joint is subjected to the pressure of seawater and seawater corrosion. Therefore, it is necessary to simulate the tensile and compressive forces and the marine environment that the test workpiece 1 is subjected to in actual use, so as to judge the mechanical properties and corrosion properties of the test workpiece 1.

[0028] The tension and compression device at least includes a tension and compression system and a tension cylinder 2. The top of the tension cylinder 2 is provided with a tension nut 24 extending into the interior thereof. The bottom end of the test workpiece 1 is threadedly connected to the top of the tension nut 24. The tension and compression system applies an axial force to the bottom end of the tension nut 24 to perform tension and compression tests on the test workpiece 1.

[0029] Exemplarily, the stretch nut 24 has a connecting groove 26 starting from the top inward, and an internal thread is arranged in the connecting groove 26, so that it can be threadedly connected to the bottom end of the test workpiece 1; the connecting groove 26 can be arranged to be a connection structure matching different test workpieces 1, and is not limited to the use of a threaded connection method.

[0030] The hydraulic device at least includes a hydraulic system and a container 3. The container 3 is connected to the tension cylinder 2. The test workpiece 1 is located in the container 3, and the top of the test workpiece 1 is installed on the top of the container 3. The hydraulic system provides a simulated marine system in the container 3 for performing corrosion testing on the test workpiece 1.

[0031] like Figure 1 , 2 As shown, the tension and compression system is a hydraulic system, a piston 27 matching the tension cylinder 2 is provided at the bottom of the tension nut 24, and the hydraulic system applies axial force to both sides of the piston 27 through hydraulic oil.

[0032] Specifically, the piston 27 divides the tension cylinder 2 into an upper chamber 21 and a lower chamber 22, and the tension cylinder 2 is respectively provided with oil circuit connection ports 25 for connecting the upper chamber 21 and the lower chamber 22 with the hydraulic system; wherein, the pipeline of the hydraulic system and the oil circuit connection port 25 can be threadedly connected to facilitate disassembly and installation.

[0033] When hydraulic oil is inputted into the upper chamber 21 through the oil circuit connection port 25 of the upper chamber 21, the pressure on the upper surface of the piston 27 increases. At this time, the pressure on the upper surface of the piston 27 is higher than the pressure on the lower surface, so that the piston 27 drives the stretching nut 24 to move downward, and the test workpiece 1 will be subjected to downward pulling force. When hydraulic oil is inputted into the lower chamber 22 through the oil circuit connection port 25 of the lower chamber 22, the pressure on the lower surface of the piston 27 increases. When the pressure on the lower surface of the piston 27 is higher than the pressure on the upper surface, the piston 27 drives the stretching nut 24 to move upward, and the test workpiece 1 will be subjected to upward pressure. When the pressures on the upper and lower surfaces of the piston 27 are equal, the piston 27 is stationary, and at this time, the test workpiece 1 is not subjected to axial tension or pressure, so the difference in the forces on the upper and lower surfaces of the piston 27 can be controlled to control the magnitude of the force on the test workpiece 1.

[0034] In one embodiment, the tension cylinder 2 is provided with a top cover 23 threadedly connected thereto, and the stretch nut 24 is threadedly connected to the piston 27 , thereby facilitating the removal, replacement, or maintenance of the piston 27 .

[0035] In the tension and compression device, sealing rings 6 may be provided at the contact points of the components to prevent leakage of hydraulic oil. For example, the outer circumference of the piston 27 and the outer circumference of the top cover 23 contacting the inner wall of the tension cylinder 2, the inner circumference of the piston 27 contacting the tension nut 24, and the inner circumference of the top cover 23 contacting the tension nut 24.

[0036] like Figure 1 , 2 As shown, the container 3 is provided with a base 31 and a detachably connected top seat 32, and the outer ring of the base 31 is symmetrically provided with a plurality of long screws 35 for detachably connecting with the top seat 32. Exemplarily, the long screws 35 are not less than 4, and the top ends of the long screws 35 pass through the top seat 32 and are then connected to the long screws 35 with connecting nuts 36 and gaskets, thereby locking the top seat 32 to the top of the container 3.

[0037] In one embodiment, a water inlet 33 and a water outlet 34 are respectively provided on the top seat 32 and the base 31 of the container 3 for connecting the container 3 with the hydraulic system; the hydraulic system and the water inlet 33 and the water outlet 34 can be threadedly connected to facilitate disassembly and installation.

[0038] In one embodiment, the base 31 of the container 3 is detachably connected to the top of the tension cylinder 2 via a socket screw 4 .

[0039] In one embodiment, the top of the test workpiece 1 extends out of the top seat 32 and is locked on the top seat 32 by a locking nut 5; therefore, the top and bottom of the test workpiece 1 are both threadedly connected to other components, thereby simulating the working environment of the outboard threaded joint threadedly installed on the threaded rudder transmission device.

[0040] In the hydraulic device, sealing rings 6 may be provided at the contact points of the components to prevent leakage of the simulated seawater, for example: the top seat 32 and the base 31 contacting the inner wall of the container 3, the inner ring of the top seat 32 contacting the test workpiece 1, and the inner circumference of the base 31 contacting the tension nut 24.

[0041] When the water outlet 34 is closed and the simulated seawater is injected into the water inlet 33 through the water pump of the hydraulic system, the water level in the container 3 gradually rises, causing the water pressure in the container 3 to gradually rise; by continuously inputting the simulated seawater, the simulated water pressure inside the container 3 can be obtained through the pressure gauge of the hydraulic system. When the water inlet 33 and the water outlet 34 are closed at the same time, the water pressure in the container 3 will be kept constant. When the water outlet 34 is opened, the simulated seawater is discharged through the water outlet 34, and the water level in the container 3 gradually drops, causing the water pressure in the container 3 to gradually drop.

[0042] In one embodiment, the tension and compression system and the water pressure system are both electrically connected to a controller for adjusting and controlling the operating parameters of the simulated ocean environment.

[0043] The management of the tension and compression system and the water pressure system are respectively provided with pressure sensors electrically connected to the controller, so that the water pressure or tension can be controlled by the controller. Specifically, the tension size, tension increase and decrease speed, frequency, and number of cycles of the tension and compression system can be set on the controller; the water pressure size, pressure increase and decrease speed, frequency, and number of cycles of the water pressure system can be set. The tension and compression device and the water pressure device can be tested under various working conditions, such as: no external force, only tension, only water pressure, and both tension and water pressure.

[0044] Preparation work: first remove the connecting nut 36 at the top of the long screw 35 and remove the top seat 32; thread the bottom end of the test workpiece 1 with the tension nut 24, pass the top seat 32 through the top of the test workpiece 1 and each long screw 35, screw the connecting nut 36 into the long screw 35 and fix the top seat 32 to the container 3, and fix the top of the test workpiece 1 with the locking nut 5; connect the two oil circuit connection ports 25 to the hydraulic system, and connect the water inlet 33 and the water outlet 34 to the water pressure system. When starting the test, enter the working condition environment values ​​of the tension and compression system and the water pressure system in the controller; according to the working conditions to be tested, start the tension and compression system and / or the water pressure system, and wait for the cycle test to be completed. After the cycle test is completed, remove the connecting nut 36 and the locking nut 5, remove the top cover 23 of the container 3, screw the test workpiece 1 out of the tension nut 24, and evaluate and test the test workpiece 1.

[0045] It should be noted that this device can not only be used to detect the corrosion and mechanical properties of the outboard threaded joints of the threaded rudder transmission device in a simulated seawater environment, but can also be used to test the relevant performance of threaded connection coatings with thread locking agents and surface coating materials at the threaded connection in a marine environment, which is beneficial for life assessment of various components and improving the testing efficiency of the material's corrosion resistance and deformation resistance.

[0046] It should be noted that the hydraulic system and water pressure system in the present application are conventional devices, which are not shown in the drawings and may not be shown.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A tensile and compressive test device for simulating a marine environment, characterized in that: include: Test artifacts; The tension and compression device at least comprises a tension and compression system and a tension cylinder, wherein the top of the tension cylinder is provided with a tension nut extending into the interior thereof, the bottom end of the test workpiece is threadedly connected to the top of the tension nut, and the tension and compression system applies an axial force to the bottom end of the tension nut to perform tension and compression tests on the test workpiece; The hydraulic device at least includes a hydraulic system and a container, wherein the container is connected to a tension cylinder, the test workpiece is located in the container, and the top of the test workpiece is installed on the top of the container, and the hydraulic system provides a simulated marine system in the container for performing corrosion testing on the test workpiece.

2. A tensile and compressive test device for simulating marine environment according to claim 1, characterized in that: The tension and compression system is a hydraulic system. A piston matching the tension cylinder is arranged at the bottom of the tension nut. The hydraulic system applies axial force to both sides of the piston through hydraulic oil.

3. A tensile and compressive test device for simulating marine environment according to claim 2, characterized in that: The piston divides the tension cylinder into an upper chamber and a lower chamber, and the tension cylinder is respectively provided with oil connection ports for connecting the upper chamber and the lower chamber with the hydraulic system.

4. A tensile and compressive test device for simulating marine environment according to claim 2, characterized in that: The tension cylinder is provided with a top cover threadedly connected thereto, and the stretching nut is threadedly connected to the piston.

5. The tensile and compressive test device for simulating marine environment according to claim 1, characterized in that: The container is provided with a base and a detachably connected top seat, and the outer ring of the base is symmetrically provided with a plurality of long screws for being detachably connected with the top seat.

6. A tensile and compressive test device for simulating marine environment according to claim 5, characterized in that: The top seat and the base of the container are respectively provided with a water inlet and a water outlet for connecting the container with the water pressure system.

7. The tensile and compressive test device for simulating marine environment according to claim 5, characterized in that: The base of the container is detachably connected to the top of the tension cylinder via a socket head screw.

8. The tensile and compressive test device for simulating marine environment according to claim 5, characterized in that: The top of the test workpiece extends out of the top seat and is locked on the top seat by a locking nut.

9. The tensile and compressive test device for simulating marine environment according to claim 1, characterized in that: A sealing ring is arranged between the outer circumference of the stretching nut and the top of the tension cylinder.

10. The tensile and compressive testing device for simulating marine environment according to claim 1, characterized in that: The tension and compression system and the water pressure system are both electrically connected to a controller for adjusting and controlling the working parameters of the simulated ocean environment.

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