Steel structure coating dynamic load and environment coupling simulation loading device and method

Abstract

The invention belongs to the technical field of steel structure engineering, and discloses a steel structure coating dynamic load and environment coupling simulation loading device and method.The steel structure coating dynamic load and environment coupling simulation loading device comprises a test box, a steel structure test piece with coating is arranged in the test box, the steel structure test piece is in transmission connection with a loading assembly, and the loading assembly and an environment control assembly act on the steel structure test piece in a coupling mode; the loading assembly comprises an electric push rod, and the output end of the electric push rod abuts against the bottom end of the steel structure test piece; a plurality of strain test elements used for detecting the strain state are attached to the steel structure test piece and are electrically connected with a control module arranged outside the test box. The device is compact in structure and convenient to use, coating loading on the steel structure by external environment and dynamic load loading coupling can be truly simulated, and the complete and systematic test of the dynamic load and environment coupling effect on the steel structure coating is realized; and data support is provided for solving the problem of deterioration of steel structure bridge coating under the coupling action of dynamic load and environment.

Description

Technical Field

[0001] The present invention relates to the technical field of steel structure engineering, and in particular to a steel structure painting dynamic load and environment coupling simulation loading device and method. Background Art

[0002] Steel structures have the advantages of energy saving, environmental protection, good earthquake resistance, and recyclability. A large number of super high-rise buildings, industrial plants, railway and highway bridges, etc. use steel structures. Among them, the steel structure of the bridge is exposed to the atmospheric environment for a long time. Under the influence of climate, load, use environment and other conditions, it will gradually corrode, affecting the stability of the steel structure of the bridge, shortening its service life and causing serious safety hazards.

[0003] Anti-corrosion coating can reduce the degree of corrosion of bridge steel structure, delay the corrosion process of steel structure, enhance the durability and safety of bridge steel structure, and effectively protect steel structure. It is a commonly used and relatively economical means of protecting bridge steel structure. However, traditional bridge coatings, under long-term environmental conditions such as strong ultraviolet rays, rain, fog, snow, temperature difference and humidity, with the alternation of thermal expansion and contraction, the performance deteriorates, the coating film is prone to cracking and falling off, the steel substrate will lose the protection of the coating, and the bridge substrate will produce stress corrosion cracking, which is a huge hidden danger. Under normal circumstances, dynamic loads and environmental factors are the more common and coupled corrosion types of steel structure bridges. By simulating the mutual coupling of dynamic loads and environmental effects on steel structure coatings, the corrosion characteristics and degradation mechanism of steel structure coatings under corresponding conditions can be mastered, and then the degradation problem of steel structure bridge coatings under the coupling of dynamic loads and the environment can be fundamentally solved.

[0004] Therefore, it is necessary to design a steel structure painting dynamic load and environment coupling simulation loading device and method to solve the above technical problems. Summary of the invention

[0005] The purpose of the present invention is to provide a steel structure painting dynamic load and environment coupling simulation loading device and method to solve the problems existing in the prior art.

[0006] To achieve the above-mentioned object, the present invention provides the following scheme: The present invention provides a steel structure painting dynamic load and environment coupling simulation loading device, comprising an independently arranged test box, wherein a steel structure specimen with painting for simulation is arranged in the test box, wherein the steel structure specimen is drivingly connected to a loading component arranged in the test box, and the loading component is coupled with an environment control component arranged in the test box to act on the steel structure specimen;

[0007] The loading assembly comprises an electric push rod disposed in the test box, and the output end of the electric push rod abuts against the bottom end of the steel structure specimen;

[0008] A plurality of strain test elements for detecting the strain state are attached to the steel structure specimen, and the strain test elements are electrically connected to a control module arranged outside the test box.

[0009] Preferably, a plurality of support rods are provided in the test box, and the steel structure specimen is fixedly mounted on the top ends of the plurality of support rods.

[0010] Preferably, a bolt is provided at the top end of the support rod, and a matching nut which is threadedly connected to the bolt and matched with the bolt is used to fix the steel structure specimen to the bolt.

[0011] Preferably, the steel structure specimen is preset with through holes corresponding to the bolts, and the bolts pass through the through holes.

[0012] Preferably, the control module includes a strain collector electrically connected to the strain testing element, the strain collector is electrically connected to a logic controller and a servo drive controller in turn, and the servo drive controller is electrically connected to the electric push rod.

[0013] Preferably, the control module further comprises a computer electrically connected to the strain collector.

[0014] Preferably, a base plate is provided in the test box, and the support rod and the electric push rod are both fixedly mounted on the base plate.

[0015] Preferably, the environmental control component includes a temperature control module, a humidity control module, a wind speed control module and a light control module arranged in the test box to change the environment in the test box.

[0016] The present application also discloses a loading method based on a steel structure painting dynamic load and environment coupling simulation loading device, comprising the following steps:

[0017] Connect the control module and the electric push rod to perform a test run to check whether the function of the electric push rod is normal;

[0018] After the electric push rod test is completed, complete the circuit connection of each component;

[0019] Import the self-compiled control program into the control module and test run the self-compiled control program;

[0020] Check the matching degree between the self-compiled control program and the test process, and adjust the parameters of the self-compiled control program according to the test requirements to meet the use requirements;

[0021] Complete the assembly of the simulated loading device so that the bottom end of the steel structure specimen abuts against the output end of the electric push rod;

[0022] The simulated loading device is started, the electric push rod and the environmental control component are coupled to output the steel structure specimen, and the strain of the steel structure specimen is monitored through the control module.

[0023] Preferably, the logic controller controls the servo drive controller through an implanted self-compiled control program to achieve control of the electric push rod.

[0024] Compared with the prior art, the present invention has the following advantages and technical effects: the present application discloses a steel structure painting dynamic load and environmental coupling simulation loading device and method, the painted steel structure specimen is fixedly mounted in a test box, the electric push rod can set the test load amplitude, loading times, loading history and other parameters through the control module, apply dynamic load to the steel structure specimen, and truly simulate the actual dynamic load loaded on the steel structure specimen; the strain test element attached to the steel structure specimen monitors the strain data of the steel structure specimen and transmits it to the control module, so as to facilitate the monitoring of the state change of the steel structure specimen after being loaded; the steel structure specimen after the dynamic load is applied is sent into a test box equipped with an environmental control component, and the environmental changes in the test box are adjusted by the environmental control component to simulate the external environment acting on the steel structure specimen, so as to realize a complete and systematic test of the effects of dynamic load and environmental coupling on the painted steel structure specimen.

[0025] The structure of the present invention is compact and easy to use. It can truly simulate the external environment and dynamic load coupling on the coating loading on the steel structure, realize the complete and systematic test of the effects of dynamic load and environmental coupling on the steel structure coating, and provide data support for solving the degradation problem of steel structure bridge coating under the coupling of dynamic load and environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0027] Figure 1 It is a schematic diagram of the dynamic load and environment coupling simulation loading device for steel structure painting of the present invention;

[0028] Figure 2 This is an axial view of a base plate according to a second embodiment of the present invention;

[0029] Figure 3 A top view of a base plate according to a second embodiment of the present invention;

[0030] Figure 4 For the present invention Figure 2 Sectional view of AA in the middle;

[0031] Figure 5 For the present invention Figure 2 Cross-sectional view of the middle BB;

[0032] Figure 6 This is a schematic diagram of the structure of the first active slider in the second embodiment of the present invention;

[0033] Figure 7 Embodiment 2 of the present invention Figure 6 A partial enlarged view of middle C;

[0034] Figure 8 It is a side view structural schematic diagram of the adjusting screw rod of the second embodiment of the present invention;

[0035] Fig. 9 This is a schematic diagram of the structure of the fixed foot of Embodiment 3 of the present invention;

[0036] Fig.10 For the present invention Fig. 9 A partial enlarged view of D in the middle;

[0037] In the figure: 1. test box; 2. steel structure specimen; 3. base plate; 4. support rod; 5. bolt; 6. electric push rod; 7. matching nut; 8. strain test element; 9. strain collector; 10. computer; 11. logic controller; 12. servo drive controller; 13. receiving slot; 14. support block; 15. first sliding slot; 16. second sliding slot; 17. first active slider; 18. first driven slider; 19. first motor; 20. first drive screw; 21. second active slider; 22. second driven slider; 2 3. Second motor; 24. Second driving screw; 25. Guide groove; 26. Drag reduction groove; 27. Drag reduction rod; 28. Drag reduction wheel; 29. ​​Adjusting screw; 30. Adjusting block; 31. Reset groove; 32. Reset plate; 33. Reset spring; 34. Fixed foot; 35. Fixed groove; 36. Fixed suction cup; 37. Control rod; 38. Frame; 39. Suction cup body; 40. Lifting plate; 41. Connecting rod; 42. First air hole; 43. Second air hole; 44. Positioning block; 45. Positioning ring; 46. Limiting block; 47. Limiting groove. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] Embodiment 1

[0041] Reference Figure 1 As shown, this embodiment provides a steel structure painting dynamic load and environment coupling simulation loading device, including an independently arranged test box 1, a steel structure specimen 2 with painting for simulation is arranged in the test box 1, the steel structure specimen 2 is transmission-connected with a loading component arranged in the test box 1, and the loading component is coupled with an environmental control component arranged in the test box 1 to act on the steel structure specimen 2;

[0042] The loading assembly includes an electric push rod 6 disposed in the test box 1, and the output end of the electric push rod 6 abuts against the bottom end of the steel structure specimen 2;

[0043] A plurality of strain test elements 8 for detecting the strain state are attached to the steel structure specimen 2 , and the strain test elements 8 are electrically connected to a control module disposed outside the test box 1 .

[0044] The present application discloses a steel structure painting dynamic load and environmental coupling simulation loading device and method, a painted steel structure specimen 2 is fixedly mounted in a test box 1, an electric push rod 6 can set test load amplitude, loading times, loading history and other parameters through a control module, apply a dynamic load to the steel structure specimen 2, and truly simulate the actual dynamic load loaded on the steel structure specimen 2; a strain test element 8 attached to the steel structure specimen 2 monitors the strain data of the steel structure specimen 2 and transmits it to the control module, so as to facilitate monitoring of the state change of the steel structure specimen 2 after being loaded; the steel structure specimen 2 after the dynamic load is applied is sent into a test box 1 provided with an environmental control component, and the environmental changes in the test box 1 are adjusted by the environmental control component to simulate the external environment acting on the steel structure specimen 2, so as to realize a complete and systematic test of the effects of dynamic load and environmental coupling on the painted steel structure specimen 2. The structure of the present invention is compact and easy to use. It can truly simulate the external environment and dynamic load coupling on the coating loading on the steel structure, realize the complete and systematic test of the effects of dynamic load and environmental coupling on the steel structure coating, and provide data support for solving the degradation problem of steel structure bridge coating under the coupling of dynamic load and environment.

[0045] In one embodiment of the present application, the strain testing element 8 includes a plurality of testing units, which are independently provided and arranged in an array on the surface of the steel structure specimen 2. Each testing unit is electrically connected to the control module, respectively, and can measure the stress response of different areas of the steel structure specimen 2, thereby detecting the coating change law under different dynamic load and environmental coupling loading conditions, and providing data support for solving the degradation problem of steel structure bridge coating under the coupling of dynamic load and environment.

[0046] Further optimizing the scheme, a plurality of support rods 4 are arranged in the test box 1, and the steel structure specimen 2 is fixedly mounted on the top of the plurality of support rods 4. The plurality of support rods 4 are arranged at the bottom end of the inner cavity of the test box 1, and the top of the support rods 4 corresponds to and supports the bottom edge of the steel structure specimen 2, and the steel structure specimen 2 with coating is suspended in the test box 1 for convenient fixing, and the electric push rod 6 is located below the steel structure specimen 2, which is convenient for dynamic load loading on the steel structure specimen 2.

[0047] Further optimization scheme, the top of the support rod 4 is provided with a bolt 5, and the bolt 5 is threadedly connected with a matching nut 7 matched with the bolt 5, and the matching nut 7 fixes the steel structure specimen 2 to the bolt 5; the steel structure specimen 2 is preset with a through hole corresponding to the bolt 5, and the bolt 5 passes through the through hole. The top of the support rod 4 is provided with a bolt 5, and the steel structure specimen 2 is pre-positioned with a through hole corresponding to the bolt 5. During installation, after the bolt 5 passes through the corresponding through hole, it is locked by the matching nut 7, and the steel structure specimen 2 is locked together with the support rod 4, completing the support and fixation of the steel structure specimen 2, which is convenient for subsequent tests.

[0048] Further optimization scheme, the test box 1 is provided with a base plate 3, and the support rod 4 and the electric push rod 6 are fixedly installed on the base plate 3. The support rod 4 is pre-positioned and welded on the base plate 3, and the bolt 5 is welded on the top of the support rod 4, and then a through hole is reserved in advance on the steel structure specimen 2 for the positioned bolt 5, and the through hole diameter is determined according to the bolt 5 number; the electric push rod 6 is also pre-welded on the base plate 3, and the distance between the steel structure specimen 2 and the base plate 3 is within the telescopic range of the electric push rod 6.

[0049] Further optimization scheme, the control module includes a strain collector 9 electrically connected to the strain test element 8, the strain collector 9 is electrically connected to the logic controller 11 and the servo drive controller 12 in turn, and the servo drive controller 12 is electrically connected to the electric push rod 6; the control module also includes a computer 10 electrically connected to the strain collector 9. The electric push rod 6 is electrically connected to the servo drive controller 12, and the test load amplitude can be set by the servo drive controller 12. The servo drive controller 12 realizes the positive and negative telescopic loading of the electric push rod 6 through the programmable logic controller 11 equipped with a self-compiled control program, and applies a dynamic load to the painted steel structure specimen 2. After the load is applied, the strain of the painted steel structure specimen 2 is measured by the attached strain test element 8, and the value is obtained by the strain collector 9 connected to the computer 10 to obtain the strain change of the steel structure specimen 2.

[0050] To further optimize the solution, the environmental control component includes a temperature control module, a humidity control module, a wind speed control module and a light control module arranged in the test box 1 to change the environment in the test box 1. The environmental control component is composed of existing equipment, which can control the environmental conditions in the test box 1, including but not limited to temperature, humidity, light, airflow and wind speed, and then can cooperate to simulate different external environments, and couple with the dynamic load loading of the electric push rod 6 to realize the dynamic load and environmental coupling simulation loading of the steel structure coating, in order to study the corrosion characteristics and degradation mechanism of the structural coating under the corresponding conditions, and then essentially solve the degradation problem of the steel structure bridge coating under the coupling of dynamic load and environment.

[0051] In summary, the principles of this application are:

[0052] The painted steel structure specimen 2 is fixed to the support rod 4 of the base plate 3 by bolts 5 and matching nuts 7. The electric push rod 6 on the base plate 3 controls the servo drive controller 12 through the programmable logic controller 11 equipped with a self-compiled control program, and then controls the electric push rod 6 to realize forward and reverse rotation. The output end thereof is extended and retracted, so that a dynamic load can be applied to the painted steel structure specimen 2. The load amplitude, loading times, loading history, etc. of the dynamic load are obtained by calculating the fatigue life of the steel structure specimen 2. The thrust value, loading rate, control parameters of the self-compiled program, etc. of the electric push rod 6 can be set in advance according to the calculation results. After the dynamic load is applied, the strain of the painted steel structure specimen 2 is monitored by the pasted strain test element 8, and the value is obtained by the strain collector 9 connected to the computer 10. The painted steel structure specimen 2 after the dynamic load is applied is sent into the temperature test box 1 that can simulate environmental changes, so as to realize a complete and systematic test of the effects of the dynamic load and the coupling of the environment on the steel structure coating.

[0053] The present application also discloses a loading method based on a steel structure painting dynamic load and environment coupling simulation loading device, comprising the following steps:

[0054] Connect the control module to the electric push rod 6 for test operation to detect whether the function of the electric push rod 6 is normal; in the internal function mode of the servo drive controller 12, initialize the parameters of the servo drive controller 12 and manually run it according to the standard parameters of the servo drive controller 12 by operating the keys on the touch panel, check the normal use function of the electric push rod 6, and eliminate the interference of the RUN signal and FWD / REV signal on the operation of the motor;

[0055] After the electric push rod 6 is tested, the circuit connection of each component is completed; after the electric push rod 6 is tested, the power supply, programmable logic controller 11, servo drive controller 12, and electric push rod 6 are connected in the power-off state;

[0056] Import the self-compiled control program into the control module and test run the self-compiled control program; download the self-compiled control program to the programmable logic controller 11, turn on the power, set the function of the servo drive controller 12, the motor code and other parameters, check the connection of the instrument, test run the self-compiled control program, and ensure the stable operation of the program;

[0057] Detect the matching degree between the self-compiled control program and the test process, and adjust the parameters of the self-compiled control program according to the test requirements to meet the use requirements; by monitoring the pulse output during the trial operation of the self-compiled control program, the parameter changes of the touch panel of the servo drive controller 12, the operation of the electric push rod 6, etc., judge the matching degree of the control program with the programmable logic controller 11, the servo drive controller 12, and the electric push rod 6 and their applicability in the test, and adjust the parameters such as the pulse frequency and the number of pulses in the control program to meet the instrument and test requirements;

[0058] Complete the assembly of the simulated loading device, so that the bottom end of the steel structure specimen 2 is in contact with the output end of the electric push rod 6; weld the electric push rod 6 to the base plate 3, and fix the painted steel structure specimen 2 to the bolt 5 welded on the top of the support rod 4 with the matching nut 7, so that it fits tightly with the initial position of the electric push rod 6;

[0059] Start the simulation loading device, the electric push rod 6 and the environmental control component are coupled to output the steel structure specimen 2, and the strain of the steel structure specimen 2 is monitored through the control module; the logic controller 11 controls the servo drive controller 12 to control the electric push rod 6 through the implanted self-compiled control program; the installed equipment and the specimen are sent to the temperature test box 1 that can simulate environmental changes, the power is turned on, the program is run, and the strain of the painted steel structure specimen 2 is measured with the attached strain test element 8, and the numerical value is obtained through the strain collector 9 connected to the computer 10.

[0060] Embodiment 2

[0061] See attached Figure 2-Figure 8 As shown, the difference between this embodiment and the first embodiment is that the base plate 3 of this embodiment is not fixed, and the relative position between the electric push rod 6 and the base plate 3 is not fixed, so that during the experiment, the electric push rod 6 can apply different loads on the steel structure specimen 2 while moving according to the set rules, simulating the dynamic load on the steel structure bridge in the working state with vehicles passing, and simulating its changes under the coupling conditions with the environment to study its degradation problem.

[0062] In order to achieve the technical effect of this embodiment, a receiving groove 13 is opened on the base plate 3, and a movable component is arranged in the receiving groove 13. The movable component is transmission-connected with a support block movably arranged in the receiving groove 13. The electric push rod 6 is installed on the support block 14 and contacts the bottom end of the steel structure specimen 2 through the contact block. When the movable component is started, it provides power to the support block to move it in the receiving groove 13, thereby driving the support rod 4 to move accordingly, loading dynamic loads to different positions of the bottom end of the steel structure specimen 2, simulating the load applied by the passage of vehicles on the bridge.

[0063] In one implementation of the present embodiment, a plurality of balls are arranged between the contact block and the contact surface of the steel structure specimen 2 to facilitate the movement of the contact block on the surface of the steel structure specimen 2 .

[0064] In one implementation of the present embodiment, the adjustment component includes a first sliding groove 15 and a second sliding groove 16 respectively provided between two groups of opposite sides of the accommodating groove 13, a first driving module is provided between the two first sliding grooves 15, and a second driving module is provided between the two second sliding grooves 16, and the first driving module and the second driving module are respectively connected to the support block for providing power for the movement of the support block.

[0065] In one implementation of this embodiment, the first sliding groove 15 and the second sliding groove 16 are located at different depth levels of the receiving groove 13, so that the first driving module and the second driving module will not interfere with each other when providing driving forces in different directions to the support block.

[0066] In one implementation of the present embodiment, the first driving module includes a first active slider 17 and a first driven slider 18 which are respectively slidably connected in two symmetrically arranged first sliding grooves 15. A first motor 19 is embedded in the first active slider 17. The output shaft of the first motor 19 is connected to a first driving screw 20, which is rotatably connected to the first driven slider 18. The first driving screw 20 passes through the support block and is threadedly connected to the support block. When the first screw rotates, the support block can move along the first driving screw 20.

[0067] In one implementation of the present embodiment, the second driving module includes a second active slider 21 and a second driven slider 22 which are respectively slidably connected in two symmetrically arranged second sliding grooves 16. A second motor 23 is embedded in the second active slider 21. The output shaft of the second motor 23 is connected to a second driving screw 24, which is rotatably connected to the second driven slider 22. The second driving screw 24 passes through the support block and is threadedly connected to the support block. When the second screw rotates, the support block can move along the second driving screw 24.

[0068] In one implementation of the present embodiment, the first drive screw 20 and the second drive screw 24 respectively penetrate different levels of the support block, so that the first drive screw 20 and the second drive screw 24 can independently drive the support block without affecting each other, so that the support block can freely translate in the plane of the accommodating groove 13, thereby driving the support rod 4 to translate and apply dynamic loads to different areas of the steel structure specimen 2.

[0069] In one implementation of the present embodiment, guide grooves 25 are respectively provided on the upper and lower sides of the first sliding groove 15, and a plurality of drag reduction modules compatible with the guide grooves 25 on the upper and lower sides are telescopically arranged on the first active slider 17. The drag reduction modules extend out of the first active slider 17 and extend into the wire groove to clamp the first active sliding block to improve stability; at the same time, the drag reduction modules can also separate the upper and lower surfaces of the first active slider 17 from the first sliding groove 15 respectively, avoiding sliding friction between the first active slider 17 and the first sliding groove 15, thereby reducing sliding resistance and wear.

[0070] In one implementation of the present embodiment, the drag reduction module includes a drag reduction groove 26 opened on the first active slider 17, and a drag reduction rod 27 is telescopically arranged in the drag reduction groove 26. One end of the drag reduction rod 27 extends out of the first active slider 17 and is installed with a drag reduction wheel 28 that matches the guide groove 25. When in use, the drag reduction wheel 28 extends into the guide groove 25 and rolls in contact with the guide groove 25, so that the first active slider 17, the drag reduction wheel 28 and the guide groove 25 form a structure similar to a rail car, which is convenient for movement.

[0071] In one implementation of the present embodiment, an adjusting screw 29 is provided on the first active slider 17, and an adjusting block 30 is threadedly connected to the adjusting screw 29. The outer wall of the adjusting block 30 is set as an inclined surface, and the inclined surface is in sliding contact with one end of the drag reduction rod 27 located in the first active slider 17. The adjusting screw 29 drives the adjusting block 30 to translate, and the inclined surface of the adjusting block 30 contacts the drag reduction rod 27 at different positions, thereby pushing the drag reduction rod 27 to move, making it convenient to push the drag reduction rod 27 out of the drag reduction groove 26, thereby realizing the telescopic setting of the drag reduction wheel 28.

[0072] In one implementation of the present embodiment, a reset groove 31 coaxially arranged with the drag reduction groove 26 is opened in the first active slider 17, and a reset plate 32 fixed to the drag reduction rod 27 is slidably connected in the reset groove 31, and a reset spring 33 is arranged between the end of the reset plate 32 facing the drag reduction wheel 28 and the reset groove 31, and the reset spring 33 is sleeved on the drag reduction rod 27; when the drag reduction rod 27 needs to be extended, the hypotenuse of the adjustment block 30 pushes the drag reduction rod 27 to extend out of the drag reduction groove 26, and then pushes the drag reduction wheel 28 to be stuck in the guide groove 25, which can not only clamp the first active slider 17 but also reduce the movement resistance, and at this time the reset spring 33 is compressed; when the drag reduction wheel 28 needs to be removed, the adjustment block 30 moves in the opposite direction and no longer resists the drag reduction rod 27, and then the reset spring 33 resets, pushing the drag reduction rod 27 to reset, so that the drag reduction wheel 28 exits the guide groove 25, and the first active slider 17 can be taken out.

[0073] In one implementation of the present embodiment, a drag reduction module is also provided on the first driven slider 18 , and its function is the same as that of the drag reduction module on the first active slider 17 , which will not be described in detail here.

[0074] In one implementation of this embodiment, a guide groove 25 with the same function is also provided in the second sliding groove 16, and the second active slider 21 and the second driven slider 22 are also respectively provided with a drag reduction module, whose function is the same as that of the drag reduction module of the first active slider 17, and will not be repeated here.

[0075] This embodiment can drive the movement of the support rod 4 through the support block, thereby realizing dynamic loading of different positions of the steel structure specimen 2.

[0076] Embodiment 3

[0077] See attached Figure 9-10 As shown, the difference between this embodiment and the first embodiment is that the base plate 3 of this embodiment is not welded to the test box 1, but is fixed in a detachable manner.

[0078] In one implementation of the present embodiment, a plurality of fixing feet 34 are provided at the bottom end of the base plate 3, and an upward fixing groove 35 is opened at the bottom end of the fixing foot 34. A fixing suction cup 36 is lifted and slid in the fixing groove 35, and a control rod 37 is transmission-connected to the top end of the fixing suction cup 36. The top end of the control rod 37 penetrates the base plate 3 upward and is threadedly connected to the base plate 3; when it is necessary to fix the base plate 3, the control rod 37 is rotated to make the fixing suction cup 36 descend and be pressurized, so that the air in the fixing suction cup 36 is discharged to form a pressure difference to achieve fixation, and then stably engage with the bottom end of the test box 1 to achieve locking of the base plate 3; and when it is necessary to unlock the base plate 3 and the test box 1, the control rod 37 is rotated in the opposite direction to make the fixing suction cup 36 communicate with the outside world, and the internal and external pressures are balanced, so that the fixing suction cup 36 loses the ability to be fixedly engaged with the bottom end of the test box 1, so that the fixing suction cup 36 is separated from the test box 1, which facilitates the separation of the base plate 3 and the test box 1.

[0079] In one implementation of the present embodiment, the fixed suction cup 36 includes a hard skeleton 38, which is transmission-connected to a control rod 37; a bowl-shaped suction cup body 39 is fixedly connected to the side wall at the bottom end of the skeleton 38, and is sucked to the bottom end of the inner cavity of the test box 1 through the suction cup body 39; when fixation is required, the skeleton 38 is pressed down by the control rod 37, and the skeleton 38 drives the suction cup body 39 to press down to contact the test box 1 and suck together, so that the base plate 3 and the test box 1 are fixed; and when the base plate 3 and the test box 1 need to be separated, the control rod 37 is rotated in the opposite direction, the suction cup body 39 is first connected to the outside world, the suction force between the suction cup body 39 and the test box 1 is removed, and the suction cup body 39 is raised to separate the base plate 3 and the test box 1.

[0080] In one implementation of the present embodiment, the bottom end of the control rod 37 is rotatably connected to the lifting plate 40 which slides longitudinally in the fixing groove 35, and the bottom end of the lifting plate 40 is fixedly connected to a connecting rod 41, which passes through the frame 38 and is sealingly slidably connected to the frame 38, and the bottom end of the connecting rod 41 is provided with a first air hole 42 which is connected to the inner cavity of the suction cup body 39, and the side wall of the connecting rod 41 is provided with a plurality of second air holes 43 which are connected to the first air holes 42; when it is necessary to fix the base plate 3 and the test box 1, the control rod 37 drives the lifting plate 40 to descend, and then drives the suction cup body 39 to descend through the connecting rod 41 and the frame 38, and when the suction cup body 39 contacts the test box 1, the connecting rod 41 is connected to the suction cup body 39, and the connecting rod 41 is connected to the suction cup body 39. The rod 41 slides with the skeleton 38, so that the second air hole 43 is aligned with the skeleton 38 so that the skeleton 38 blocks the second air hole 43, and the inner cavity of the suction cup body 39 is disconnected from the outside world. Then, the suction cup body 39 is continuously compressed by the skeleton 38 to discharge the air in the basin body, resulting in a pressure difference and thus fixing the basin body. When it is necessary to separate the fixed suction cup 36 from the test box 1, the control rod 37 drives the lifting plate 40 to rise, and then drives the connecting rod 41 to rise and slide with the skeleton 38, so that the second air hole 43 is misaligned with the skeleton 38, and then the inside and outside of the suction cup body 39 are connected through the first air hole 42 and the second air hole 43, so that the fixed suction cup 36 is separated from the test box 1.

[0081] In one implementation of the present embodiment, a positioning block 44 is provided at the bottom end of the connecting rod 41, and the positioning block 44 is opened at the bottom end of the first air hole 42; a positioning ring 45 is provided on the outer wall of the control rod 37, and the positioning ring 45 is located above the second air hole 43. The movement between the skeleton 38 and the connecting rod 41 is limited by the positioning block 44 and the positioning ring 45. At the same time, when it is necessary to drive the skeleton 38 to move, the setting of the positioning block 44 and the positioning ring 45 can also facilitate the application of force to the skeleton 38.

[0082] In one implementation of the present embodiment, the side wall of the lifting ring is provided with a plurality of limit blocks 46, and the side wall of the fixing groove 35 is provided with a plurality of longitudinally arranged limit grooves 47, and the limit blocks 46 are slidably connected in the limit grooves 47 to limit the lifting ring and improve the stability of the lifting ring.

[0083] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0084] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A dynamic load and environment coupling simulation loading device for steel structure painting, characterized in that: The invention comprises an independently arranged test box (1), wherein a steel structure test piece (2) with coating for simulation is arranged in the test box (1), wherein the steel structure test piece (2) is drivingly connected to a loading component arranged in the test box (1), and the loading component is coupled with an environmental control component arranged in the test box (1) to act on the steel structure test piece (2); The loading assembly comprises an electric push rod (6) arranged in the test box (1), and the output end of the electric push rod (6) abuts against the bottom end of the steel structure specimen (2); A plurality of strain test elements (8) for detecting the strain state are attached to the steel structure test piece (2), and the strain test elements (8) are electrically connected to a control module arranged outside the test box (1).

2. The steel structure painting dynamic load and environment coupling simulation loading device according to claim 1 is characterized by: A plurality of support rods (4) are arranged in the test box (1), and the steel structure test piece (2) is fixedly mounted on the top ends of the plurality of support rods (4).

3. The steel structure painting dynamic load and environment coupling simulation loading device according to claim 2 is characterized by: A bolt (5) is provided at the top end of the support rod (4), and a matching nut (7) matched with the bolt (5) is threadedly connected to the bolt (5), and the matching nut (7) fixes the steel structure specimen (2) to the bolt (5).

4. The steel structure painting dynamic load and environment coupling simulation loading device according to claim 3 is characterized by: The steel structure test piece (2) is preset with a through hole arranged corresponding to the bolt (5), and the bolt (5) passes through the through hole.

5. The steel structure painting dynamic load and environment coupling simulation loading device according to claim 1 is characterized by: The control module comprises a strain collector (9) electrically connected to the strain testing element (8), the strain collector (9) being electrically connected in turn to a logic controller (11) and a servo drive controller (12), and the servo drive controller (12) being electrically connected to the electric push rod (6).

6. The steel structure painting dynamic load and environment coupling simulation loading device according to claim 5 is characterized by: The control module also includes a computer (10) electrically connected to the strain collector (9).

7. The steel structure painting dynamic load and environment coupling simulation loading device according to claim 2 is characterized by: A base plate (3) is provided in the test box (1), and the support rod (4) and the electric push rod (6) are both fixedly mounted on the base plate (3).

8. The steel structure painting dynamic load and environment coupling simulation loading device according to claim 1 is characterized by: The environmental control component comprises a temperature control module, a humidity control module, a wind speed control module and a light control module which are arranged in the test box (1) to change the environment in the test box (1).

9. A method for simulating the dynamic load and environment coupling of steel structure painting, based on the device for simulating the dynamic load and environment coupling of steel structure painting according to any one of claims 1 to 8, characterized in that The following steps are involved: Connecting the control module to the electric push rod (6) to perform a test run to detect whether the function of the electric push rod (6) is normal; After the electric push rod (6) is tested, the circuit connection of each component is completed; Import the self-compiled control program into the control module and test run the self-compiled control program; Check the matching degree between the self-compiled control program and the test process, and adjust the parameters of the self-compiled control program according to the test requirements to meet the use requirements; The assembly of the simulated loading device is completed so that the bottom end of the steel structure specimen (2) is in contact with the output end of the electric push rod (6); The simulated loading device is started, the electric push rod (6) and the environmental control component are coupled to output the steel structure specimen (2), and the strain of the steel structure specimen (2) is monitored through the control module.

10. The method for simulating the coupling of dynamic load and environment for steel structure painting according to claim 9, characterized in that: The logic controller (11) controls the servo drive controller (12) through an implanted self-compiled control program, thereby realizing control of the electric push rod (6).

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