Adjustable circulating corrosion device

Abstract

The invention discloses an adjustable circulating corrosion device. The device comprises a slurry tank; the rotating disc is rotatably arranged in the slurry tank, and at least two connecting tables in the same direction are symmetrically arranged on the rotating disc in the circumferential direction of the rotating disc; the embedded block clamps are respectively in one-to-one correspondence, are selectively rotationally or fixedly connected with the connecting table, and are used for fixing the test piece; wherein the connecting table extends for 40 mm in the tangential direction of the rotary table and then is cut out in the circumferential direction, and the angle between the embedded block clamp and the connecting table can be adjusted. The device has the characteristics of accurately adjusting the impact angle and the impact variable, has relatively high flexibility, can complete tests of special corrosion environments such as high temperature, low temperature and sediment accompanying by replacing accessories in a later period, and can realize a corrosion test function under the combined action of stress and scouring by replacing the types of clamps.

Description

Technical Field

[0001] The present invention relates to the technical field of testing and experimental devices, and more particularly to an adjustable cyclic corrosion device. Background Art

[0002] Erosion corrosion is a major form of marine corrosion. In engineering structures, erosion corrosion is a metal damage phenomenon caused by high-speed relative motion between metal surfaces and corrosive fluids. It is the result of the interaction between erosion wear and electrochemical corrosion. Erosion is a mechanical process in which solid particles impact the material surface, resulting in material removal or deformation. Corrosion is a process in which chemical or electrochemical reactions occur on the material surface, resulting in material removal. The interaction between these two processes is synergistic. The weight loss of metal materials caused by the synergistic effect of erosion and corrosion is much greater than the sum of the separate effects of erosion and corrosion. The factors affecting the corrosion rate mainly include environmental factors, erosion angle, material composition and its microstructure, and heat treatment system.

[0003] With the implementation of the national marine strategy, the development of unmanned boats at sea has gradually received attention. Their working environment is complex, and the propellers are susceptible to seawater erosion and corrosion, resulting in capacity loss that can account for 30% of the total loss. Such damage causes the speed of the unmanned boat to decrease, and the energy consumption increases, which reduces the endurance.

[0004] Conducting experimental research under simulated process conditions in the laboratory is currently an effective method to obtain the erosion-corrosion performance parameters of materials. Among them, the experimental device plays a vital role. At present, the most commonly used experimental devices include rotating electrode testers, jet erosion-corrosion testers and pipe flow erosion-corrosion testers, but the above three experimental devices all have their own defects: the rotating electrode tester is more difficult to control the impact angle between the electrode and the liquid, and the impact angle is usually small; the disadvantage of the jet erosion-corrosion tester is that unless the particle content is very low, the particles will inevitably interact with each other. , the high-speed jet must pass through the low-speed fluid moving laterally across the surface, the impact velocity of the particles will be reduced, and the impact angle will also change. When the impact angle is less than 90°, the flow pattern in the flow channel is no longer symmetrical, making the flow analysis more complicated. In addition, the actual impact angle of the particles in the experiment is not equivalent to the nominal jet angle; the shortcomings of the tube flow erosion corrosion tester are also prominent. The whole system occupies a large space, the experiment requires a large amount of solution, the pump needs to run continuously, the experimental cycle is long, the reliability requirements of valves, pipe fittings and seals are high, the cost of the whole device and the experimental cost are high, and the simulated wall shear force is relatively small.

[0005] At present, most of the test devices used to study erosion have not established a relationship between the important variables such as erosion angle, rotation speed and rotation radius and the degree of erosion corrosion. That is, most of the test devices cannot effectively simulate the working conditions of propellers in complex sea areas, nor can they analyze the relationship between the degree of erosion in different areas of the propeller blades (different erosion angles and rotation radius) and important related variables as the propeller speed changes. Summary of the invention

[0006] The purpose of the present invention is to design and develop an adjustable cyclic corrosion device, which can adjust different erosion angles, erosion speeds or other erosion variables, accurately obtain the relationship between different erosion variables and erosion degrees, and improve experimental accuracy.

[0007] The technical solution provided by the present invention is:

[0008] An adjustable cyclic corrosion device, comprising:

[0009] Slurry tanks; and

[0010] A turntable, which is rotatably arranged in the slurry tank, and the turntable is symmetrically provided with at least two connecting platforms in the same direction along its circumference;

[0011] The mosaic block fixtures are respectively connected to the connecting platform in a one-to-one manner and can be selectively rotatably or fixedly connected to fix the test piece;

[0012] The connecting platform is extended along the tangent direction of the rotating disk and then cut out along the circumferential direction, and the angle between the mosaic block fixture and the connecting platform is adjustable.

[0013] Preferably, it also includes:

[0014] A single-phase asynchronous motor, which is detachably arranged on the outside of the slurry tank;

[0015] A transmission shaft is vertically and rotatably arranged in the slurry tank, and the transmission shaft is connected to the power output end of the single-phase asynchronous motor;

[0016] Wherein, the turntable is vertically fixedly sleeved on the transmission shaft.

[0017] Preferably, it also includes:

[0018] Connecting pieces, which are respectively and detachably fixed in the connecting platform, and a plurality of positioning holes are arranged at equal intervals at one end of the connecting piece away from the connecting platform;

[0019] Wherein, one end of the mosaic block fixture is rotatably connected to one end of the connecting piece.

[0020] Preferably, it also includes:

[0021] A positioning through hole, which is arranged on the mosaic block fixture, and the positioning through hole can be arranged corresponding to any positioning hole;

[0022] The adjusting bolt can be selectively passed through any one of the positioning holes and the positioning through hole.

[0023] Preferably, the other end of the mosaic block fixture is an annular hollow structure, and one side of the annular hollow structure is an open structure, and the open structures can be selectively moved closer to or farther from each other;

[0024] Wherein, the test piece is detachably arranged in the annular hollow structure.

[0025] Preferably, it also includes:

[0026] Fastening bolts passing through both ends of the opening structure;

[0027] A fastening nut cooperates with the fastening bolt to be locked.

[0028] Preferably, the connecting platform is extended 40 mm along the tangent direction of the turntable and then cut out along the circumferential direction.

[0029] Preferably, it also includes:

[0030] A coupling, which is arranged between the transmission shaft and the power output end of the single-phase asynchronous motor;

[0031] An upper sleeve, which is fixed on the transmission shaft and is used to press the turntable;

[0032] Wherein, the turntable is fixed on the shoulder of the transmission shaft, and the upper sleeve, the turntable and the shoulder of the transmission shaft are fixed to each other.

[0033] Preferably, it also includes:

[0034] A support base, which is fixed to the bottom of the slurry tank;

[0035] Two pipeline interfaces are centrally symmetrically arranged near the upper and lower ends of the slurry tank in the circumferential direction, and are used for fluid inflow and fluid outflow;

[0036] A plurality of support plates, which are arranged in a cross shape at the bottom of the support seat;

[0037] Wherein, a plurality of through grooves are arranged at intervals on the support seat, and the pipeline interface can be placed in the through grooves.

[0038] Preferably, the number of the connecting platforms is 6, each connecting platform is spaced 60 degrees apart, and the distal end of each connecting platform is on the same horizontal line as the starting end of another adjacent connecting platform.

[0039] The beneficial effects of the present invention are:

[0040] (1) The present invention designs and develops an adjustable cyclic corrosion device, which can use a motor to generate different rotation speeds, and change the impact angle of the test piece by adjusting the angles of the mosaic block fixture and the connecting parts, thereby obtaining the relationship between variables such as erosion wear rate, impact angle, rotation speed and material properties. It can also change the water temperature of the slurry tank inlet and discharge the original fluid medium through the outlet to achieve real-time adjustment of the test environment temperature.

[0041] (2) The adjustable cyclic corrosion device designed and developed by the present invention has strong flexibility and expandability. By replacing the type of fixture, the corrosion test function of the combined action of stress and scour can be realized. It can provide data support for the prediction of scour corrosion of pump blades or ship propellers in engineering applications, and is suitable for the erosion prediction, optimization design and other research of multiphase flow pump bodies and ship and sea impeller accessories. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a schematic diagram of the structure of the adjustable cyclic corrosion device of the present invention.

[0043] Figure 2 It is a schematic diagram of the cross-sectional structure of the adjustable cyclic corrosion device of the present invention.

[0044] Figure 3 This is a schematic diagram of the assembly structure of the slurry tank described in the present invention.

[0045] Figure 4 It is a structural schematic diagram of the support base described in the present invention.

[0046] Figure 5 It is a schematic diagram of the assembly structure of the transmission shaft of the present invention.

[0047] Figure 6 It is a schematic structural diagram of the turntable of the present invention.

[0048] Figure 7 The figure is a schematic diagram of the assembly structure of the mosaic block fixture and the connecting piece of the present invention. DETAILED DESCRIPTION

[0049] The present invention is further described in detail below so that those skilled in the art can implement it according to the description.

[0050] like Figure 1 As shown, the present invention provides an adjustable cyclic corrosion device comprising:

[0051] A slurry tank 110, a sealing cover 111, a bell jar 121, a support plate 123, a support seat 122 and a single-phase asynchronous motor 130;

[0052] Among them, the slurry tank 110 is sealed by a sealing cover 111, the bell-shaped cover 121 is detachably arranged on the top of the slurry tank 110 by bolts, and the large diameter end of the bell-shaped cover 121 is in contact with the sealing cover 111, the single-phase asynchronous motor 130 is detachably fixed on the outside of the small diameter end of the bell-shaped cover 121, and at the same time, the power output shaft of the single-phase asynchronous motor 130 can be rotatably inserted into the bell-shaped cover 121, the support seat 122 is fixed to the bottom of the slurry tank 110, and a support plate 123 is arranged at the bottom of the support seat 122, and the support plate 123 is arranged in a cross shape as a whole, which saves costs while improving stability.

[0053] In this embodiment, two pipe interfaces (an upper pipe interface 112 and a lower pipe interface 113) are provided at positions near the upper and lower ends of the slurry tank 110 in the circumferential direction, and the upper pipe interface 112 and the lower pipe interface 113 are centrally symmetrical, both extending along the circumference of the slurry tank 110, for fluid inflow and fluid outflow, namely, a water inlet and a water outlet.

[0054] In this embodiment, in order to facilitate the placement of the lower pipe interface 113 , a plurality of through slots 124 are provided at intervals on the support seat 122 , and the lower pipe interface 113 can be selectively placed in any one of the through slots 124 .

[0055] like Figure 2 , Figure 5 As shown, a transmission shaft 142 is supported through the slurry tank 110. At the same time, one end of the transmission shaft 142 is connected to the power output shaft of the single-phase asynchronous motor 130 through a plum blossom-shaped elastic coupling 141. In order to ensure the positional relationship between the transmission shaft 142 and the slurry tank 110, the coupling 141 is vertically supported in the bell cover 121.

[0056] One end of the transmission shaft 142 is rotatably passed through the sealing cover 111 through a first bearing 144, and the other end is rotatably supported in the slurry tank 110 through a second bearing 148 embedded in the bottom of the slurry tank 110; the first bearing 144 is pressed by an upper bearing end cover 143 arranged on the outside of the sealing cover 111, and the upper bearing end cover 143 is fixed to the outer ring of the first bearing 144 by bolts; the second bearing 148 is pressed by a lower bearing end cover 147 arranged at the bottom of the slurry tank 110, and the lower bearing end cover 147 is fixed to the outer ring of the second bearing 148 by bolts, and the upper bearing end cover 143 and the lower bearing end cover 147 are both empty sleeves on the transmission shaft 142.

[0057] The output shaft of the single-phase asynchronous motor 130 , the coupling 141 , the bell housing 121 , the upper bearing end cover 143 , the lower bearing end cover 147 , the first bearing 144 , and the second bearing 148 are all coaxial with the transmission shaft 142 .

[0058] In this embodiment, if Figure 2-Figure 4 As shown, the slurry tank 110 is a cylindrical structure, and the top of the slurry tank 110 is an open structure. In another embodiment, it can be replaced with a slurry tank 110 of other shapes as needed, and at least one fixing groove is provided at the bottom of the slurry tank 110. The support seat 122 is a disc-mounted structure as a whole, and at least one boss corresponding to the fixing groove is provided inside the support seat 122, thereby realizing the fixation between the slurry tank 110 and the support seat 122.

[0059] In this embodiment, a cross-shaped groove is provided at the bottom of the support seat 122 , and the support plate 123 is fixed in the cross-shaped groove.

[0060] A rotating disk 150 is fixedly sleeved on the shoulder of the transmission shaft 142 , so that the rotation of the transmission shaft 142 drives the rotating disk 150 to rotate.

[0061] In this embodiment, the fixed end cover 146 is fixedly sleeved on the transmission shaft 142 by four fixed end cover radial fastening bolts arranged at intervals, and the fixed end cover 146 is pressed onto the turntable 150, and the fixed end cover 146 and the shoulder of the transmission shaft 142 are fixedly clamped in the middle by six evenly distributed turntable axial fastening bolts.

[0062] An upper sleeve 145 and a lower sleeve 149 are sleeved on the transmission shaft 142. The upper end face of the upper sleeve 145 contacts the inner ring of the first bearing 144, and the lower end face contacts the fixed end cover 146 that also passes through the transmission shaft 142. The lower sleeve 149 is arranged between the lower bearing end cover 147 and the shoulder of the transmission shaft 142.

[0063] The upper sleeve 145 , the fixed end cover 146 , the rotating disk 150 , and the lower sleeve 149 are also coaxially mounted on the transmission shaft 142 .

[0064] like Figure 6 As shown, the rotating disk 150 is symmetrically provided with at least two connecting platforms 151 in the same direction, and the connecting platforms 151 extend 40 mm along the tangent direction of the rotating disk 150 and then cut out along the circumferential direction, similar to a ratchet structure.

[0065] In this embodiment, the number of the connecting platforms 151 is 6, each connecting platform 151 is spaced 60° apart, and the distal end of each connecting platform 151 is on the same horizontal line with the starting end of another adjacent connecting platform 151, that is, the 6 connecting platforms 151 are all arranged in the same direction along the circumference of the turntable 150 and connected end to end.

[0066] like Figure 7As shown, a connecting piece 152 is detachably provided at the far end of the connecting platform 151 , which improves the fixing strength and can be replaced according to the needs of different test pieces 200 .

[0067] In this embodiment, the connecting member 152 is fixed to the distal end of the connecting platform 151 through a connecting plate and a plurality of fastening bolts.

[0068] In this embodiment, a plurality of positioning holes 171 are evenly spaced apart at one end of the connecting member 152 away from the connecting platform 151 , so as to fix the rotation angle of the mosaic block fixture 160 .

[0069] One end of the mosaic block fixture 160 can be rotatably connected to one end of the connecting member 152, and a positioning through hole (not shown in the figure) is provided on the mosaic block fixture 160, and the positioning through hole can be arranged corresponding to any one of the positioning holes 171. The mosaic block fixture 160 and the connecting member 152 can be fixed by passing an adjusting bolt 172 through any one of the positioning holes 171 and the positioning through hole, and the angle between the mosaic block fixture 160 and the connecting member 152 can be adjusted by switching different positioning holes 171.

[0070] In this embodiment, one end of the connecting member 152 is configured as a groove structure, and one end of the mosaic block fixture 160 is rotatably inserted into the groove structure of the connecting member 152, and axial positioning is performed by rotating the bolt 153 of the fixture.

[0071] In this embodiment, the other end of the mosaic block fixture 160 is an annular hollow structure for placing the test piece 200, and one side of the annular hollow structure is an open structure, and the open structures can be selectively moved closer or farther away from each other to accommodate different test pieces 200.

[0072] In this embodiment, a threaded hole is correspondingly provided on the opening structure, and the fastening bolt 161 passes through the threaded hole and is locked with the fastening nut after being matched.

[0073] In this embodiment, the specimen 200 is a cylindrical rubber structure with a metal test piece embedded in it. In another embodiment, the specimen 200 can be any other structure, and the corresponding mosaic block fixture 160 can be replaced with other structures. It is only necessary to ensure that the position of the mosaic block fixture 160 and the connecting member 152 can be fixed and the angle can be adjusted.

[0074] The operation process of the adjustable cyclic corrosion device of the present invention is as follows:

[0075] (1) placing the metal test piece in a mounting machine for mounting, and grinding and polishing the mounted mounting block;

[0076] (2) The polished mosaic block is disassembled and the weight M1 of the polished specimen is measured by an electronic balance, and the area S of the polished surface of the specimen is measured at the same time;

[0077] (3) Then put it into the setting machine for setting again, number each mosaic block according to the experimental plan and put it into the mosaic block fixture in turn and tighten it with the tightening bolts;

[0078] (4) Pour the prepared fluid medium of a certain concentration into the slurry tank, and finally completely install the test device;

[0079] (5) Start the single-phase asynchronous motor to rotate the turntable for erosion test. During this period, the speed of the single-phase asynchronous motor can be adjusted by the speed regulator;

[0080] (6) After the erosion time T required by the test is met, turn off the single-phase asynchronous motor, take out the mosaic block for disassembly, and measure the weight M2 of the eroded specimen. The weight loss of the specimen is obtained by (M1-M2) / (S*T). The eroded specimen can continue to be observed using a scanning electron microscope to obtain more information;

[0081] (7) If the test environment temperature needs to be changed, a hose can be connected to the upper and lower pipe interfaces of the slurry tank, the original fluid medium can be discharged from the lower pipe interface, and the fluid medium adjusted to a certain temperature by a refrigeration compressor or a constant temperature water bath can be introduced from the upper pipe interface to achieve the change of the test environment temperature.

[0082] An adjustable cyclic corrosion device designed and developed by the present invention can utilize a motor to generate different rotation speeds, change the impact angle of the test piece by adjusting the angles of the mosaic block fixture and the connector, and thus obtain the relationship between variables such as the erosion wear rate, impact angle, rotation speed and material properties, and can also change the water temperature of the slurry tank inlet and discharge the original fluid medium through the outlet to achieve real-time adjustment of the test environment temperature; and the device has strong flexibility and expansibility, and can realize the corrosion test function of the combined action of stress and scour by replacing the fixture type, and can provide data support for the scour corrosion prediction of pump blades or ship propellers in engineering applications, and is suitable for the erosion prediction, optimization design and other research of multiphase flow pump bodies and ship and sea impeller accessories.

[0083] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the embodiments shown and described herein.

Claims

1. An adjustable cyclic corrosion device, characterized in that: include: Slurry tank; as well as A turntable, which is rotatably arranged in the slurry tank, and the turntable is symmetrically provided with at least two connecting platforms in the same direction along its circumference; The mosaic block fixtures are respectively connected to the connecting platform in a one-to-one manner and can be selectively rotatably or fixedly connected to fix the test piece; The connecting platform is extended along the tangent direction of the rotating disk and then cut out along the circumferential direction, and the angle between the mosaic block fixture and the connecting platform is adjustable.

2. The adjustable cyclic corrosion device according to claim 1, characterized in that: Also includes: A single-phase asynchronous motor, which is detachably arranged on the outside of the slurry tank; A transmission shaft is vertically and rotatably arranged in the slurry tank, and the transmission shaft is connected to the power output end of the single-phase asynchronous motor; Wherein, the turntable is vertically fixedly sleeved on the transmission shaft.

3. The adjustable cyclic corrosion device according to claim 2, characterized in that: Also includes: Connecting pieces, which are respectively and detachably fixed in the connecting platform, and a plurality of positioning holes are arranged at equal intervals at one end of the connecting piece away from the connecting platform; Wherein, one end of the mosaic block fixture is rotatably connected to one end of the connecting piece.

4. The adjustable cyclic corrosion device according to claim 3, characterized in that: Also includes: A positioning through hole, which is arranged on the mosaic block fixture, and the positioning through hole can be arranged corresponding to any positioning hole; The adjusting bolt can be selectively passed through any one of the positioning holes and the positioning through hole.

5. The adjustable cyclic corrosion device according to claim 4, characterized in that: The other end of the mosaic block fixture is an annular hollow structure, and one side of the annular hollow structure is an open structure, and the open structures can be selectively moved closer to or farther from each other; Wherein, the test piece is detachably arranged in the annular hollow structure.

6. The adjustable cyclic corrosion device according to claim 5, characterized in that: Also includes: Fastening bolts passing through both ends of the opening structure; A fastening nut cooperates with the fastening bolt to be locked.

7. The adjustable cyclic corrosion device according to claim 6, characterized in that: The connecting platform is extended 40 mm along the tangent direction of the turntable and then cut out along the circumferential direction.

8. The adjustable cyclic corrosion device according to claim 7, characterized in that: Also includes: A coupling, which is arranged between the transmission shaft and the power output end of the single-phase asynchronous motor; An upper sleeve, which is fixed on the transmission shaft and is used to press the turntable; Wherein, the turntable is fixed on the shoulder of the transmission shaft, and the upper sleeve, the turntable and the shoulder of the transmission shaft are fixed to each other.

9. The adjustable cyclic corrosion device according to claim 8, characterized in that: Also includes: A support base, which is fixed to the bottom of the slurry tank; Two pipeline interfaces are centrally symmetrically arranged near the upper and lower ends of the slurry tank in the circumferential direction, and are used for fluid inflow and fluid outflow; A plurality of support plates, which are arranged in a cross shape at the bottom of the support seat; Wherein, a plurality of through grooves are arranged at intervals on the support seat, and the pipeline interface can be placed in the through grooves.

10. The adjustable cyclic corrosion device according to claim 9, characterized in that: The number of the connecting platforms is 6, each connecting platform is spaced 60 degrees apart, and the distal end of each connecting platform is on the same horizontal line as the starting end of another adjacent connecting platform.

Images