CN211553530U - Quick anti-abrasion testing device - Google Patents
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- CN211553530U CN211553530U CN201921629394.1U CN201921629394U CN211553530U CN 211553530 U CN211553530 U CN 211553530U CN 201921629394 U CN201921629394 U CN 201921629394U CN 211553530 U CN211553530 U CN 211553530U
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Abstract
The utility model relates to a quick anti grinding test device that dashes. The utility model aims at providing a high-efficient, simple quick anti abrasion test method and device to improve comparability, reliability and the commonality of test. The technical scheme of the utility model is that: the utility model provides a quick anti abrasion testing arrangement which characterized in that: the device is provided with a pressure water source manufacturing mechanism and high-pressure jet nozzles, wherein the output port of the pressure water source manufacturing mechanism is connected with one or more high-pressure jet nozzles through a high-pressure water conveying pipeline, and a high-pressure gas cylinder for eliminating pulsating pressure on the pipeline is connected to the high-pressure water conveying pipeline. The utility model is suitable for an anti erosion and abrasion test field.
Description
Technical Field
The utility model relates to a quick anti grinding test device that dashes. The method is suitable for the field of abrasion resistance testing.
Background
The problem of erosion and abrasion damage of the overflow surface of a hydraulic structure is always a big problem in the industry, numerous researches are carried out in various countries to support engineering design and application, and several types of erosion and abrasion test methods are formed. The more common and relatively mature anti-abrasion method is summarized as follows:
1. compressed air sand blasting method: the abrasion resistance of the material is relatively evaluated according to the abrasion condition of the test piece by the standard test method of concrete abrasion resistance specified in the United states.
However, air replaces water to drive sand grains to continuously cut and impact the surface of the test piece, although the sand grain impact abrasion resistance of different materials can be better compared, the sand grain impact abrasion resistance can only represent the impact characteristics of sand grains which are wrapped by the tested piece and are resistant to air, water and air are greatly different, the impact force is deflected by a water film, and after local small pits are formed on the surface of the test piece, a water cushion effect and possible local cavitation are formed. More importantly, whether the impact energy of the hard sand grains is absorbed by the surface or not is related to the hardness degree of a tested test piece, the flexibility is good, the hard sand grains have certain tensile strength, the hard sand grains cannot be abraded by a wind sand gun method or the abrasion value is greatly deviated from the actual underwater abrasion, and even if the hard sand grains have high strength and abrasion value, the brittle and hard material can still be abraded by high-speed sand grains in a hard-to-hard mode, so that the test data cannot directly indicate that the tested material is resistant to water scouring.
2. Sand-carrying water flow ring method: a commonly used method is commonly called an underwater ring method, a tested material is poured into a ring-shaped test piece with a specified size, abrasion medium corundum sand and water are placed in the test piece, a motor drives a metal gear to rotate in the ring-shaped test piece, and sand-containing water flow generates a linear velocity and a centrifugal force, so that the inner surface of the ring-shaped test piece is abraded, and the abrasion resistance and abrasion resistance of the material are evaluated by abrasion loss of the test piece.
Practice shows that the assembly clearance and the height difference between a rotating gear and a test piece can seriously influence the wear rate, in addition, the main wear occurs in the early stage of testing, the clearance in the early stage is small, and sand grains form a cutting effect on the surface due to the overlapping effect. Meanwhile, edges and corners of sand particles are inevitably dull and refined through circulating operation, and the abrasion capacity is reduced, so that the test time period of each unit cannot be overlong, and the sand water is required to be updated generally within 1 hour. The coarser the sand, the shorter the unit test period should be.
3. An underwater steel ball abrasion method: a common method is commonly called as an underwater steel ball method, and the method is characterized in that steel balls with a certain particle size proportion carried by water are utilized to smash towards an iron barrel wall under the action of a rotating centrifugal force and rebound to the surface of a round test specimen, and the process is circulated and rolls on the surface of the test specimen in a jumping manner, so that the method is used for researching the anti-impact grinding performance of concrete under the action of bed load.
The method is more reliable in the thrust abrasion resistance of common concrete and high-strength concrete, but is difficult to test high-strength resin concrete and epoxy coating because of lower flow rate and limited thrust abrasion strength; and similar to polyurea high-elasticity rubber products, even if the test time is prolonged by tens of times, measurable damage is difficult to generate.
4. The field simulation impact grinding test method comprises the following steps: the Yangtze river water conservancy and hydropower science research institute builds the first high-speed sand-laden water flow test base in China in the No. 7 dam section of the Danjiang estuary engineering dam. The test field comprises a water drainage pipeline system, a circulating sand adding system, a test piece mounting groove and a test parameter monitoring system. Because the flow state of the high-speed sand-carrying water flow and the effect on the surface of the test piece are similar to the state of the material in the actual working process, the test result has better regularity, the simulation performance and the precision are higher, the actual problem of the anti-impact wear-resistant concrete design of the engineering is solved, and a large amount of data is accumulated for researching the wear resistance of the concrete and other materials.
The maximum flow velocity can only reach 20m/s due to the limitation of the water level height of the dam reservoir at the Danjiang river mouth, the material range of the test is influenced, and the dam needs to be supported, although the method and the test are scientific and reasonable, and the popularization and the application are difficult.
5. Simulation abrasion resistance test method: the method has the advantages that (patent number: ZL201410322654.6) the impact resistance and wear resistance of the building with the overflow surface are simulated by a miniature model through regulating controllable pressure, flow velocity and sand-holding quantity simulation actual engineering impact parameters, the pipelines with different shapes are tested materials, certain simulation is realized, and the problem of data universality is solved.
However, the method has a scale effect, a large amount of data research is needed for a distortion part to serve as a support, the research depth is not enough and the accumulated data is not much so as to influence the technical popularization and application. In addition, the difficulty of model casting is brought by miniaturization, the data accuracy is easily influenced due to local casting defects, the problem of easy defects of mold making can be solved by enlarging the diameter of the channel pipe, and the energy consumption can be greatly increased.
The first three methods are cited in the standard, although the application is common, the method can only be applied to the comparison of the resistance to abrasion of certain performances of materials on a specific method, for example, the resistance to cutting, impact, friction and the like is realized by adding sand, the requirements on the mold making and the electromechanical control are higher, even if the difference of the abrasion resistance is tested by a certain method, if one device is changed or another method is changed to continue abrasion, because the systematic error is larger, the interference factors are numerous, for example, the gap is difficult to control consistently, the water temperature is difficult to control consistently, the water turbidity is difficult to control consistently and the like, the test results may be greatly different, and therefore, the comparability between the methods is poor.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: aiming at the existing problems, the high-efficiency and simple rapid abrasion resistance testing device is provided to improve the comparability, the reliability and the universality of the test.
The utility model adopts the technical proposal that: a quick abrasion resistance test method is characterized in that:
performing impact grinding on the surface of the test piece by stable ultrahigh-pressure water jet;
forming a punching pit on the surface of the test piece after punching and grinding for a specific time;
and acquiring the volume of the punching pit, and evaluating the abrasion resistance of the test piece according to the volume of the punching pit.
The method for obtaining the volume of the punching pit and evaluating the abrasion resistance of the test piece according to the volume of the punching pit comprises the following steps:
selecting fine sand with a specific mesh number to fill the punching pit, and scraping redundant sand grains;
weighing the mass of the sand grains in the flushing pit by adopting a high-precision electronic scale;
and (4) according to the correlation between the pit punching volume and the sand grain mass in the pit punching, evaluating the abrasion resistance of the test piece by using the sand grain mass in the pit punching to represent an abrasion value.
The utility model provides a quick anti abrasion testing arrangement which characterized in that: the device is provided with a pressure water source manufacturing mechanism and high-pressure jet nozzles, wherein the output port of the pressure water source manufacturing mechanism is connected with one or more high-pressure jet nozzles through a high-pressure water conveying pipeline, and a high-pressure gas cylinder for eliminating pulsating pressure on the pipeline is connected to the high-pressure water conveying pipeline.
The pressure water source manufacturing mechanism adopts a large-flow high-pressure pump or a plurality of small-flow high-pressure pumps which are connected in parallel.
And a nozzle pressure sensor for monitoring the water pressure of the nozzle is arranged near the high-pressure jet nozzle.
And the high-pressure water conveying pipeline is provided with a pipeline pressure sensor for monitoring the water pressure in the pipeline.
The pipeline pressure sensor is arranged between the high-pressure gas cylinder and the high-pressure jet nozzle.
And a pipeline valve is arranged on the high-pressure water conveying pipeline.
The high-pressure jet nozzle is formed by processing diamond, tungsten steel or alloy diamond.
The high-pressure gas cylinder adopts a pressure-resistant carbon fiber pressure cylinder.
The utility model has the advantages that: the utility model is simple in operation high-efficient, through stable super high pressure water jet rush to grind test piece surface, rush through the regulation and grind the velocity of flow, rush to grind the angle, rush to grind time, spout diameter and pack sand grain gradation to the same condition is tested, improves comparability, reliability and the commonality of test.
Drawings
Fig. 1 is a schematic structural diagram of the embodiment.
Detailed Description
As shown in fig. 1, the present embodiment is a rapid abrasion resistance testing device, which includes a pressure water source manufacturing mechanism and a high-pressure jet nozzle 6 processed by diamond, tungsten steel or alloy diamond, an output port of the pressure water source manufacturing mechanism is connected to the high-pressure jet nozzle 6 through a high-pressure water pipe 1, the high-pressure water pipe 1 is connected to a high-pressure gas cylinder 2 (pressure-resistant carbon fiber pressure cylinder) for eliminating pulsating pressure on the pipe, and a pipe valve 4 is installed on the high-pressure water pipe 1 between the high-pressure gas cylinder 2 and the high-pressure jet nozzle 6. In the embodiment, the pressure water source manufacturing mechanism adopts a large-flow high-pressure pump or a plurality of small-flow high-pressure pumps which are connected in parallel.
A nozzle pressure sensor 5 for monitoring the water pressure of the nozzle is arranged near the high-pressure jet nozzle 6 in the embodiment; the high-pressure water conveying pipeline 1 is provided with a pipeline pressure sensor 3 for monitoring the water pressure in the pipeline, and the pipeline pressure sensor 3 is arranged between the high-pressure gas cylinder 2 and the high-pressure jet nozzle 6. And the nozzle pressure sensor 5 and the pipeline pressure sensor 3 are used for monitoring whether the water pressure is stable or not, judging whether the test process is abnormal or not and recording test process data.
The specific test method of this example is as follows:
the requirement is tested 8 smooth levels in surface, if there is unevenness, should carry out appropriate cutting and polish to the later stage is more standard to be washed the pit and is weighed the step, improves the data accuracy. If the area of the test piece is large, a marker can be properly selected for gridding marking so as to carry out multi-group tests.
According to the test purpose, the test material and the combination type material experience parameters, selecting a reasonable high-pressure jet nozzle 6, flow speed and duration of abrasion, adjusting the vertical distance between the high-pressure jet nozzle 6 and the tested piece 8, and determining whether to perform transient test spraying according to the situation.
Before the flushing and grinding, the water conveying pipeline is firstly subjected to sealing test (the pipeline valve 4 is closed) and is inflated to increase the pressure, the pressure in the high-pressure gas cylinder 2 reaches a certain value and then is subjected to water flowing and pressure increasing, water mist is collected near the flushing and grinding test piece and is made to flow back to a water taking point, and recycling is achieved.
During the punching and grinding, the high-pressure jet nozzle 6 jets out stable ultrahigh-pressure water jet to punch and grind the surface of the test piece, and after the stable ultrahigh-pressure water jet is punched and ground for a specific time, a punching pit is formed on the surface of the test piece.
After the preset time of punching and grinding is finished, taking out the test piece, drying the water in the punching pit, filling the punching pit by adopting sand grains with specific fineness, lightly scraping according to a fixed angle to enable the sand grains to be full of the punching pit and flush with the edge of the original plane, pouring out the sand grains in the punching pit, weighing on a high-precision weighing device, repeating the filling and weighing actions for one time or multiple times, taking the arithmetic mean value for multiple times as a final weight value, and evaluating the anti-punching and grinding performance of the test piece by using the sand grain mass in the punching pit to represent the punching and grinding value.
The test report should specify the necessary parameters of each test condition, such as pressure, flow rate, nozzle diameter, spray distance, angle, etc.
The embodiment has the following advantages:
anti-water flow scouring and grinding in true sense
Other mainstream anti-abrasion test methods can not eliminate the influence caused by different machines, flow states and media all the time, when the general anti-abrasion test is carried out, a plurality of groups of blank tests are required, then a plurality of groups of material samples are tested for comparison and analysis, abnormal data are required to be omitted sometimes, and the method is complicated. The ultra-high pressure water jet flow is directly adopted, the actual damage mechanism closest to high-speed water flow is not needed to be analyzed, demonstrated and compared, the reliability of the selected anti-abrasion material can be accelerated and researched by increasing the flow rate by a plurality of times of the actual flow rate of the engineering, and a basis is provided for selecting a reasonable anti-abrasion material for the engineering.
② the preparation requirement of the sample is greatly simplified
The existing methods have high requirements on test pieces, some are required on dimensional accuracy, some are required on total weight, and some are required on soaking. The method adopted by the embodiment has almost no requirement on the sample, and even if a small stone like a palm is taken back, only one cutting is needed, and the punching and grinding test can be carried out after a plane is formed, because the test process only needs a plane larger than 2 square centimeters, and one-time punching and grinding can be completed.
③ the anti-abrasion performance of the two materials can be qualitatively compared at the same time
In the anti-abrasion test process, the materials with the abrasion characteristics close to those of the two materials are difficult to distinguish on data, because the error range of the existing equipment is large, and the abrasion resistance of the materials is difficult to determine through the data comparison of test samples. In the embodiment, only two parallel jet flows are needed to change the high-pressure jet nozzle 6, the consistency of conditions is ensured by using the same pressure source, and in the same time, the same device is used for determining who is firstly damaged on the surface, so that the material can be distinguished from better wear resistance, or the method is adopted to weigh the quality of the sand filled in the flushing pit, and better distinction can be also carried out.
Fourthly, the impact and abrasion resistance strength can be quantitatively analyzed
The grinding flow rate, the grinding angle, the grinding time, the nozzle diameter, the grinding distance and the sand filling grade are regulated, the test is carried out under the same condition, the formed sand filling amount of the grinding pit can represent the accurate grinding grade, and the corresponding grinding strength relation can be summarized along with the accumulation of future sample data.
Fifthly, rapidly finishing the punching and grinding test work
In the embodiment, under the condition of the flow velocity of 70 meters, the obvious pits can be punched out within 30min, the data repeatability is good, and even if the epoxy resin mortar with high compressive strength is used, the obvious pits can be punched out after the flow velocity is increased to 130 meters and the epoxy resin mortar is ground for 2 hours. The strength of the abrasion resistant material is generally lower than or close to that of epoxy mortar/concrete. Therefore, the time for punching and grinding the data can be finished in one day, and compared with the existing other methods, the data punching efficiency is greatly improved.
Data universality
Through appointed general parameter setting or forming a comparison table, the data can obtain the same result in different laboratories, and as mechanical errors, gap errors and sample preparation errors are completely absent, the data have comparability and universality only by properly detecting and regulating the water pressure.
Seventh, the method has the widest application range
The water pressure is simply adjusted, and the pressure can be adjusted in a wide range by changing the number and power of the high-pressure pumps or changing the diameter of the nozzles, so that the method has a wide range of applicable testing materials.
Claims (8)
1. The utility model provides a quick anti abrasion testing arrangement which characterized in that: the device is provided with a pressure water source manufacturing mechanism and high-pressure jet nozzles (6), wherein the output port of the pressure water source manufacturing mechanism is connected with one or more high-pressure jet nozzles (6) through a high-pressure water conveying pipeline (1), and a high-pressure gas cylinder (2) for eliminating pulsating pressure on the pipeline is connected to the high-pressure water conveying pipeline (1).
2. The rapid abrasion resistance testing device according to claim 1, characterized in that: the pressure water source manufacturing mechanism adopts a large-flow high-pressure pump or a plurality of small-flow high-pressure pumps which are connected in parallel.
3. The rapid abrasion resistance testing device according to claim 1, characterized in that: and a nozzle pressure sensor (5) for monitoring the water pressure of the nozzle is arranged near the high-pressure jet nozzle (6).
4. The rapid abrasion resistance testing device according to claim 1 or 3, characterized in that: and the high-pressure water conveying pipeline (1) is provided with a pipeline pressure sensor (3) for monitoring the water pressure in the pipeline.
5. The rapid abrasion resistance testing device according to claim 4, characterized in that: the pipeline pressure sensor (3) is arranged between the high-pressure gas cylinder (2) and the high-pressure jet nozzle (6).
6. The rapid abrasion resistance testing device according to claim 1, characterized in that: the high-pressure water conveying pipeline (1) is provided with a pipeline valve (4).
7. The rapid abrasion resistance testing device according to claim 1, characterized in that: the high-pressure jet nozzle (6) is processed by diamond, tungsten steel or alloy diamond.
8. The rapid abrasion resistance testing device according to claim 1, characterized in that: the high-pressure gas cylinder (2) adopts a pressure-resistant carbon fiber pressure cylinder.
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| CN110553904A (en) * | 2019-09-27 | 2019-12-10 | 杭州国电大坝安全工程有限公司 | Rapid abrasion resistance testing method and device |
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| CN110553904A (en) * | 2019-09-27 | 2019-12-10 | 杭州国电大坝安全工程有限公司 | Rapid abrasion resistance testing method and device |
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