Erosion and wear testing system

Abstract

The present invention discloses an erosion and wear test system capable of applying dynamic tensile stress, comprising a servo hydraulic unit, an erosion chamber, a sand mixing and drainage unit, and a circulation pipeline. The solenoid valve and the servo valve in the servo hydraulic unit are connected to the servo cylinder in the erosion chamber to adjust the position of the sample and apply dynamic tensile stress to the sample. The jet pipeline in the circulation pipeline is connected to the nozzle flange in the erosion chamber so that the mortar impacts the sample in the form of a jet through the nozzle. The inlet pipeline and the return pipeline in the circulation pipeline are respectively connected to the cone leak in the erosion chamber and the sand storage tank in the sand mixing and drainage unit so that the sand mixing liquid circulates during the test process. The present invention can perform sand-water two-phase flow erosion and wear tests on samples under dynamic tensile stress conditions, and provide reliable experimental support for studying the erosion and wear behavior of materials under dynamic stress conditions.

Description

Technical Field

[0001] The invention relates to the technical field of test analysis, and in particular to an erosion and wear test system capable of applying dynamic load tensile stress. Background Art

[0002] Erosion and wear failure is a common failure mode in the oil and gas industry. Especially during the hydraulic fracturing construction process in oil fields, the fracturing fluid in the fracturing pipe flows in a pulsating form, and the fracturing fluid pressure is extremely high, up to 140MPa, which will produce great dynamic stress on the pipe. In addition to bearing high internal pressure and fatigue loads, the pipe is also subjected to erosion damage by the high-speed flowing sand-water mixed slurry. Under this complex coupling mechanism of "fatigue-erosion", fracturing pipes are prone to erosion and wear failure, which will lead to pipe puncture and even fracture accidents, seriously threatening the safety of operators.

[0003] At present, no research on erosion wear test of materials under dynamic load fatigue has been carried out at home and abroad, and there are few related test equipments. Only two inventions with application numbers 201110195083.0 and 201110195021.X involve erosion wear of materials under stress state, and the above two inventions mainly use hydraulic drive mechanism to apply constant load tensile force to the specimens during erosion process. However, dynamic load fatigue stress is more complicated than constant load stress, and for actual working conditions, most pressure-bearing components are subjected to dynamic load. It is difficult to test and analyze the erosion failure of materials under dynamic load conditions using existing equipment. In the known technology, there is no research on the erosion wear behavior of materials under dynamic load fatigue.

[0004] Therefore, the inventors, relying on their many years of experience and practice in related industries, have developed the erosion and wear test system of the present invention that can apply dynamic load tensile stress, which is convenient for carrying out erosion and wear tests that take dynamic load effects into consideration, so as to truly simulate the erosion and wear of fracturing pipes during operation. Summary of the invention

[0005] In order to make up for the deficiencies in the prior art, the present invention provides an erosion and wear test system capable of applying dynamic tensile stress.

[0006] Wherein, the present invention adopts the following technical scheme:

[0007] An erosion and wear test system capable of applying dynamic tensile stress comprises: a servo hydraulic unit, an erosion chamber, a sand mixing and sewage discharge unit and a circulation pipeline;

[0008] The servo hydraulic unit is used to control the advance and retreat of the servo cylinder to apply a controllable dynamic tensile force to the sample contained in the erosion chamber; the sand mixing and sewage discharge unit is used to contain the sand mixing liquid configured in a predetermined proportion;

[0009] The circulation pipeline is connected with the sand mixing and sewage discharge unit and the erosion chamber, and is used for conveying the sand mixing liquid to the erosion chamber for spraying, and for refluxing the sand mixing liquid in the erosion chamber.

[0010] As a preferred embodiment, the servo hydraulic unit includes: a first relief valve, a second relief valve, a first electromagnetic ball valve, a second electromagnetic ball valve, a servo valve,

[0011] Among them, the servo valve in the servo hydraulic unit is connected to the servo cylinder; the servo valve repeatedly switches the oil inlet and outlet at its P port and T port under the control of the controller; the oil circuit pressure value is regulated by the first relief valve and the second relief valve, wherein the first relief valve adjusts the high point pressure and the second relief valve adjusts the low point pressure.

[0012] As a preferred embodiment, the servo hydraulic unit includes: a solenoid valve, a pressure sensor, a high-pressure filter, an oil pump, an air cooler, and an oil return filter;

[0013] The obtained oil circuit pressure value is fed back to the controller by the pressure sensor, so that the controller can control the maximum value, minimum value and pulsation frequency of the dynamic tensile force applied to the sample;

[0014] The oil pump is driven by a motor to provide hydraulic oil; the high-pressure filter and the reflux filter filter the inlet oil and return oil of the oil pump respectively; the air cooler is used to cool the return oil.

[0015] As a preferred embodiment, the erosion chamber comprises: a support tube;

[0016] A nozzle, a first sample chuck and a second sample chuck are placed and fixed in the support tube of the erosion chamber; the sample is fixed between the first sample chuck and the second sample chuck by bolts; the nozzle is used to spray out the sand mixing liquid to impact the sample; and the cone drain placed under the support tube can discharge the sand mixing liquid.

[0017] As a preferred implementation manner, the servo cylinder of the erosion chamber is threadedly connected to the first sample chuck.

[0018] As a preferred implementation, the tension sensor of the erosion chamber is threadedly connected to the second sample chuck.

[0019] As a preferred embodiment, the sand mixing and sewage discharge unit comprises: a sand storage tank, a stirring motor, a stirring fan blade, a sewage discharge valve, a sewage discharge pump, and a sampling valve;

[0020] The sand storage tank in the sand mixing and sewage discharge unit contains sand and water configured in a predetermined ratio; the stirring motor is fixedly installed above the sand storage tank, and the stirring motor drives the fan blades to stir and mix the sand and water to form a mixed sand liquid; the sampling valve is placed on one side of the sand storage tank for checking the concentration of the mixed sand liquid.

[0021] As a preferred embodiment, the sand storage tank in the sand mixing and sewage discharge unit can be connected to the cone drain of the erosion chamber to recover the sand mixing liquid after the test; the sewage valve placed at the bottom of the sand storage tank and the sewage pump connected to the sewage valve are used to discharge the waste.

[0022] As a preferred embodiment, the inlet pipeline in the circulation pipeline is connected to the sand storage tank to transport the mixed sand liquid to the mortar pump, and the mortar pump controls the speed through a frequency converter to control the inlet flow rate of the mixed sand liquid; the jet pipeline of the circulation pipeline connects the mortar pump and the nozzle; the return pipeline of the circulation pipeline connects the cone leak and the sand storage tank for circulation.

[0023] As a preferred implementation, the jet pipeline is provided with a flow meter, a pressure gauge and a temperature gauge to monitor the flow parameters of the jet sand mixing liquid.

[0024] The beneficial effects of the present invention are:

[0025] 1. The erosion test system of the present invention is mainly composed of a servo hydraulic unit, an erosion chamber, a sand mixing and sewage discharge unit, and a circulation pipeline. It can carry out erosion and wear tests under dynamic load stress conditions, and can change the flow rate of the sand mixing liquid and the concentration of sand particles.

[0026] 2. In the present invention, the maximum tensile force applied to the sample is up to 110KN, which can produce a tensile stress of 550MPa for a sample with a cross-sectional area of ​​200 square millimeters, and the dynamic load frequency can reach up to 20Hz. The device can meet the parameters required for testing the erosion and wear of fracturing pipes under severe fracturing conditions.

[0027] 3. In the present invention, a sampling valve is provided on one side of the sand storage tank in the sand mixing and sewage discharge unit, which can test the sand concentration in the mixed slurry. In addition, a sewage discharge valve is provided below the sand storage tank and connected to a sewage discharge pump, so that the waste after the test can be discharged more conveniently.

[0028] In summary, the present invention has a reasonable structural design and is simple to operate. It can effectively simulate the "fatigue-erosion" coupling effect of fracturing pipes under complex and harsh working conditions indoors, provide reliable experimental support for the study of the erosion and wear failure mechanism of fracturing pipes, and reduce safety hazards in production operations.

[0029] With reference to the following description and the accompanying drawings, the specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope thereby.

[0030] Features described and / or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0031] It should be emphasized that the term “include / comprises” when used herein refers to the presence of features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying creative labor.

[0033] Figure 1 : is an overall principle diagram of an erosion and wear test system according to an embodiment of the present invention;

[0034] Figure 2 :for Figure 1 Schematic diagram of the three-dimensional structure of the erosion cavity;

[0035] Figure 3 :for Figure 1 A schematic cross-sectional view of the front view of the erosion cavity;

[0036] Figure 4 :for Figure 1 Schematic diagram of a top view cross-section of an erosion cavity.

[0037] Description of the accompanying figures: 1-1, cone leak; 1-2, nozzle; 1-3, second sample chuck; 1-4, tension sensor; 1-5, support tube; 1-6, sample; 1-7, servo cylinder; 1-8, first sample chuck; 1-9, sensor fixing screw plug; 1-10, sensor tube; 1-11, nozzle bracket; 1-12, nozzle flange; 1-13, top cover; 1-14, servo cylinder; 1-15, support tube fixing flange; 1-16, force transmission nut;

[0038] 2-1, mortar pump; 2-2, frequency converter; 2-3, jet pipeline; 2-4, pressure gauge; 2-5, flow meter; 2-6, temperature gauge; 2-7, return pipeline;

[0039] 3-1, sewage pump; 3-2, sampling valve; 3-3, sand storage tank; 3-4, stirring motor; 3-5, stirring fan blade; 3-6, sewage valve;

[0040] 4-1, oil pump; 4-2, high pressure filter; 4-3, solenoid valve; 4-4, pressure sensor; 4-5, servo valve; 4-6, second solenoid ball valve; 4-7, second overflow valve; 4-8, first solenoid ball valve; 4-9, first overflow valve; 4-10, air cooler; 4-11, return oil filter. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings 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 should fall within the scope of protection of the present invention.

[0042] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be another element centered thereon. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be another element centered thereon at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0044] See also Figure 1-Figure 4 The present embodiment proposes an erosion and wear test system capable of applying dynamic tensile stress, comprising: an erosion and wear test system capable of applying dynamic tensile stress, comprising a servo hydraulic unit, an erosion chamber, a sand mixing and sewage discharge unit, and a circulation pipeline.

[0045] The servo hydraulic unit includes a solenoid valve 4-3, a first overflow valve 4-9, a second overflow valve 4-7, a first electromagnetic ball valve 4-8, a second electromagnetic ball valve 4-6, a servo valve 4-5, a pressure sensor 4-4, a high-pressure filter 4-2, an oil pump 4-1, an air cooler 4-10, and an oil return filter 4-11. The erosion chamber includes a support tube 1-5, a nozzle 1-2, a servo cylinder 1-7, a tension sensor 1-4, a first sample chuck 1-8, a second sample chuck 1-3, a cone leak 1-1, a nozzle flange 1-12, a sensor tube 1-10, a servo cylinder tube 1-14, a support tube fixing flange 1-15, a nozzle bracket 1-11, a force transmission nut 1-16, a sensor fixing screw plug 1-9, and a top cover 1-13. The sand mixing and sewage discharge unit includes a sand storage tank 3-3, a stirring motor 3-4, a stirring fan blade 3-5, a sewage valve 3-6, a sewage pump 3-1, and a sampling valve 3-2.

[0046] The circulation pipeline includes an inlet pipeline, a return pipeline 2-7, a jet pipeline 2-3, a flow meter 2-5, a pressure gauge 2-4, a temperature gauge 2-6, a mortar pump 2-1, and a frequency converter 2-2. Among them, the solenoid valve 4-3 and the servo valve 4-5 in the servo hydraulic unit are connected to the servo cylinder 1-7 in the erosion chamber to adjust the position of the sample 1-6 and apply dynamic tensile stress to the sample 1-6. The jet pipeline 2-3 in the circulation pipeline is connected to the nozzle flange 1-12 in the erosion chamber so that the mortar impacts the sample 1-6 in the form of a jet through the nozzle 1-2. The inlet pipeline and the return pipeline in the circulation pipeline are respectively connected to the cone leak 1-1 in the erosion chamber and the sand storage tank 3-3 in the sand mixing and sewage discharge unit so that the sand mixing liquid circulates during the test process.

[0047] As described above, the erosion and wear test system capable of applying dynamic tensile stress, wherein both ends of the solenoid valve 4-3 in the servo hydraulic unit are connected to the servo cylinder 1-7, can perform point-by-point control on the forward and backward operation of the servo cylinder 1-7, so as to facilitate the installation / removal operation of the sample 1-6.

[0048] As described above, the erosion and wear test system capable of applying dynamic tensile stress, wherein the servo valve 4-5 in the servo hydraulic unit is connected to the servo cylinder 1-7. According to the instructions of the controller (e.g., the host computer), the servo valve 4-5 repeatedly switches the oil inlet and outlet at its P and T ports. The oil circuit pressure value is regulated by the first relief valve 4-9 and the second relief valve 4-7. Among them, the first relief valve 4-9 adjusts the high point pressure, and the second relief valve 4-7 adjusts the low point pressure. The obtained oil circuit pressure value is fed back to the controller by the pressure sensor 4-4 to realize closed-loop control. The oil pump 4-1 is driven by a motor to provide hydraulic oil for the pump station system circulation. The high-pressure filter 4-2 and the reflux filter filter the incoming oil and the returning oil respectively. The air cooler 4-10 cools the returning oil.

[0049] As described above, the erosion wear test system capable of applying dynamic tensile stress, wherein a nozzle, a first sample chuck 1-8 and a second sample chuck 1-3 are placed and fixed in the support tube 1-5 of the erosion chamber. The sample 1-6 is fixed between the two sample chucks 1-6 by bolts. The sand mixing liquid is ejected from the nozzle 1-2 and impacts the sample 1-6, and the cone drain 1-1 placed under the support tube 1-5 can discharge the sand mixing liquid.

[0050] In the erosion wear test system capable of applying dynamic tensile stress as described above, the servo cylinder 1-7 of the erosion chamber is threadedly connected to the first sample chuck 1-8. The nozzle 1-4 of the tension sensor 1-2 is threadedly connected to the second sample chuck 1-3.

[0051] The erosion and wear test system capable of applying dynamic tensile stress as described above, wherein the sand storage tank 3-3 in the sand mixing and sewage discharge unit contains sand and water used for the experiment, and the sand and water ratio is pre-placed according to the experimental requirements. A stirring motor 3-4 is fixedly installed above the sand storage tank 3-3, and the stirring motor 3-4 drives the fan blades to stir and mix the sand and water to form a mixed sand liquid. The sampling valve 3-2 is placed on one side of the sand storage tank 3-3 to check the concentration of the mixed slurry.

[0052] In the erosion wear test system capable of applying dynamic tensile stress as described above, the sand storage tank 3-3 in the sand mixing and drainage unit can be connected to the cone drain 1-1 in the erosion chamber to recover the slurry after the test. The drainage valve 3-6 placed at the bottom of the sand storage tank 3-3 and the drainage pump 3-1 connected thereto can discharge the waste.

[0053] In the erosion and wear test system capable of applying dynamic tensile stress as described above, the inlet pipeline in the circulation pipeline is connected to the sand storage tank 3-3 to transport the sand mixing liquid to the mortar pump 2-1, and the mortar pump 2-1 controls the speed through the frequency converter 2-2 to control the inlet flow rate of the sand mixing liquid. The jet pipeline 2-3 connects the mortar pump 2-1 and the nozzle, and is provided with a flow meter 2-5, a pressure gauge 2-4 and a temperature gauge 2-6 to monitor the flow parameters of the jet sand mixing liquid. The return pipeline 2-7 connects the cone leak 1-1 and the sand storage tank 3-3 to form a circulation flow of mortar in the system.

[0054] The beneficial effects of this embodiment are:

[0055] 1. The erosion test system of this embodiment is composed of a servo hydraulic unit, an erosion chamber, a sand mixing and sewage discharge unit, and a circulation pipeline. It can carry out erosion and wear tests under dynamic load stress conditions, and can change the flow rate of the sand mixing liquid and the sand concentration.

[0056] 2. In this embodiment, the maximum tensile force applied to the sample 1-6 is up to 110KN, which can generate a tensile stress of 550MPa for the sample 1-6 with a cross-sectional area of ​​200 square millimeters, and the dynamic load frequency can reach up to 20Hz. The device can meet the parameters required for testing the erosion and wear of fracturing pipes under severe fracturing conditions.

[0057] 3. In this embodiment, a sampling valve 3-2 is provided on one side of the sand storage tank 3-3 in the sand mixing and sewage discharge unit, which can test the concentration of sand particles in the mixed slurry. In addition, a sewage valve 3-6 is provided below the sand storage tank 3-3 and connected to the sewage pump 3-1, so that the waste after the test can be discharged more conveniently.

[0058] In summary, this embodiment has a reasonable structural design and is easy to operate. It can effectively simulate the "fatigue-erosion" coupling effect of fracturing pipes under complex and harsh working conditions indoors, provide reliable experimental support for the study of the erosion and wear failure mechanism of fracturing pipes, and reduce safety hazards in production operations.

[0059] in, Figure 1 This is a schematic diagram of the erosion and wear test system capable of applying dynamic tensile stress in this embodiment; Figure 2 is a three-dimensional schematic diagram of the erosion chamber in this embodiment; Figure 3 A schematic cross-sectional view of the front view of the erosion chamber in this embodiment; Figure 4 Schematic diagram of the top view and cross section of the erosion chamber in this embodiment.

[0060] like Figure 1 As shown, this embodiment provides an erosion wear test system capable of applying dynamic tensile stress, including a servo hydraulic unit, an erosion chamber, a sand mixing and sewage discharge unit, and a circulation pipeline. The servo hydraulic unit includes a solenoid valve 4-3, a first overflow valve 4-9, a second overflow valve 4-7, a first electromagnetic ball valve 4-8, a second electromagnetic ball valve 4-6, a servo valve 4-5, a pressure sensor 4-4, a high-pressure filter 4-2, an oil pump 4-1, an air cooler 4-10, and an oil return filter 4-11.

[0061] In this embodiment, the oil pump 4-1 is driven by a motor to provide hydraulic oil for the pump station system circulation at a constant pressure. The first electromagnetic ball valve 4-8 is energized and the motor is started. The two ends of the electromagnetic valve 4-3 are connected to the servo cylinder 1-7, and the forward and backward operations of the servo cylinder 1-7 can be controlled by jog, so as to facilitate the installation / unloading of the sample 1-6. The second electromagnetic ball valve 4-6 is energized by the host computer, and the servo valve 4-5 repeatedly switches the oil inlet and outlet at its P and T ports according to the frequency requirements issued by the host computer. The oil circuit pressure value is regulated by the first relief valve 4-9 and the second relief valve 4-7, wherein the first relief valve 4-9 adjusts the high point pressure, and the second relief valve 4-7 adjusts the low point pressure, and the relief valve pressure adjustment value is issued by the host computer. The obtained oil circuit pressure value is fed back to the host computer by the pressure sensor 4-4 to realize closed-loop control. The servo valve 4-5 is connected to the servo cylinder 1-7. Through this implementation, the maximum value, minimum value and frequency of the dynamic load tensile force acting on the sample 1-6 can be controlled by the system output. The high pressure filter 4-2 and the return filter 4-11 filter the incoming oil and the return oil respectively. The air cooler 4-10 cools the return oil;

[0062] See also Figure 1-Figure 4 The erosion chamber includes: a support tube 1-5, a nozzle 1-2, a servo cylinder 1-7, a tension sensor 1-4, a first sample chuck 1-8, a second sample chuck 1-3, a cone leak 1-1, a nozzle flange 1-12, a sensor tube 1-11, a servo cylinder tube 1-14, a support tube fixing flange 1-15, a nozzle bracket 1-11, a force transmission nut 1-16, a sensor fixing screw plug 1-9, and a top cover 1-13.

[0063] In this embodiment, the support tube 1-5 is fixed on the stand through the support tube fixing flange 1-15, and the servo cylinder tube 1-14 and the sensor tube 1-10 are respectively fixed on both sides of the support tube 1-5 by bolt connection.

[0064] The servo cylinder 1-7 is placed in the servo cylinder barrel 1-14, and an oil pipe joint is provided above the servo cylinder barrel 1-14. The servo cylinder 1-7 can be connected to the solenoid valve 4-3 and the servo valve 4-5 in the servo hydraulic unit through the oil pipe joint. The servo cylinder 1-7 is connected to the first sample chuck 1-8 through threads.

[0065] In addition, the tension sensor 1-4 is placed in the sensor tube 1-10, and the tension sensor 1-4 is threadedly connected to the second sample clamp 1-3 through a force transmission nut 1-16. The tension sensor 1-4 can be fixed in the sensor tube 1-9 through a sensor fixing screw plug 1-9.

[0066] Further, the sample 1-6 is fixed between the first sample chuck 1-8 and the second sample chuck 1-3 by bolt connection.

[0067] Preferably, the nozzle bracket 1-11 is fixed to the support tube fixing flange 1-15 by bolt connection, the nozzle flange 1-12 is fixed to the nozzle bracket 1-11 by set screws, and the nozzle 1-2 is threadedly fixed to the nozzle flange 1-12. The nozzle 1-2 is placed in the support tube 1-5 facing the sample 1-6, and the distance between the nozzle 1-2 and the sample 1-6 can be adjusted by adjusting the set screws. The sand mixing liquid is ejected from the nozzle 1-2 and impacts the sample 1-6. The cone drain 1-1 is arranged below the support tube 1-5 to discharge the sand mixing liquid.

[0068] Further, the top cover 1-13 is placed above the support tube 1-5, and the top cover 1-13 can be embedded with a transparent acrylic plate to observe the erosion process. In addition, a mounting hole can be provided on the top cover 1-13 to place a particle velocity measuring instrument to obtain the impact velocity of particles on the sample.

[0069] like Figure 1 As shown, the sand mixing and sewage discharge unit includes: a sand storage tank 3-3, a stirring motor 3-4, a stirring fan blade 4-5, a sewage valve 3-6, a sewage pump 3-1, and a sampling valve 3-2.

[0070] Furthermore, the sand storage tank 3-3 is placed on the stand below the cone leak 1-1 in the erosion cavity. The sand storage tank 3-3 is filled with sand and water used in the experiment, and the sand and water ratio is pre-placed according to the experimental requirements. A stirring motor 3-4 is fixedly installed above the sand storage tank 3-3, and the stirring motor 3-4 drives the stirring blade 3-5 to stir and mix the sand and water. A sampling valve 3-2 is provided on one side of the sand storage tank 3-3, which can check the concentration of the mixed slurry during the sand mixing process.

[0071] In addition, the sand storage tank 3-3 can be connected to the cone drain 1-1 in the erosion chamber to recover the slurry after the test, and the sewage valve 3-6 placed at the bottom of the sand storage tank 3-3 and the sewage pump 3-1 connected thereto can discharge the waste.

[0072] like Figure 1 As shown, the circulation pipeline includes: an inlet pipeline 2-8, a return pipeline 2-7, a jet pipeline 2-3, a flow meter 2-5, a pressure gauge 2-4, a temperature gauge 2-6, a mortar pump 2-1, and a frequency converter 2-2.

[0073] The inlet pipeline 2-8 is connected to the sand storage tank 3-3 to transport the mortar liquid to the mortar pump 2-1. The mortar pump 2-1 controls the speed through the frequency converter 2-2 to control the slurry inlet flow. The jet pipeline 2-3 connects the mortar pump 2-1 and the nozzle flange 1-12. A flow meter 2-5, a pressure gauge 2-4 and a temperature gauge 2-6 are placed near the nozzle flange 1-12 to monitor the flow parameters of the jet slurry. The return pipeline 2-7 connects the cone leak 1-1 and the sand storage tank 3-3 to form a mortar circulation flow.

[0074] Any numerical value cited herein includes all values ​​of lower and upper values ​​that increase by one unit from the lower limit to the upper limit, and there is at least a two-unit interval between any lower value and any higher value. For example, if the value of the quantity of a component or a process variable (such as temperature, pressure, time, etc.) is stated to be from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, the purpose is to illustrate that values ​​such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also explicitly listed in the specification. For values ​​less than 1, one unit is appropriately considered to be 0.0001, 0.001, 0.01, 0.1. These are merely examples that are intended to be clearly expressed, and it can be considered that all possible combinations of numerical values ​​listed between the lowest value and the highest value are clearly stated in the specification in a similar manner.

[0075] Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. "About" or "approximately" used with a range applies to both endpoints of the range. Thus, "about 20 to 30" is intended to cover "about 20 to about 30", including at least the specified endpoints.

[0076] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for all purposes. The term "consisting essentially of..." to describe a combination should include the identified elements, ingredients, parts or steps and other elements, ingredients, parts or steps that do not substantially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe a combination of elements, ingredients, parts or steps herein also contemplates embodiments that consist essentially of these elements, ingredients, parts or steps. By using the term "may", it is intended to indicate that any attribute described that "may" include is optional.

[0077] Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure "one" or "an" used to describe an element, ingredient, part or step is not intended to exclude other elements, ingredients, parts or steps.

[0078] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but should be determined with reference to the appended claims and the full scope of equivalents possessed by such claims. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to be a waiver of the subject matter, nor should it be considered that the inventors did not consider the subject matter to be part of the disclosed inventive subject matter.

Claims

1. An erosion and wear test system capable of applying dynamic tensile stress, characterized in that: include: Servo hydraulic unit, erosion chamber, sand mixing and sewage discharge unit and circulation pipeline; The servo hydraulic unit is used to control the advance and retreat of the servo cylinder to apply a controllable dynamic tensile force to the sample contained in the erosion chamber; the sand mixing and sewage discharge unit is used to contain the sand mixing liquid configured in a predetermined proportion; The circulation pipeline is connected with the sand mixing and sewage discharge unit and the erosion chamber, and is used to transport the sand mixing liquid to the erosion chamber for spraying, and to reflux the sand mixing liquid in the erosion chamber; The servo hydraulic unit comprises: a first relief valve, a second relief valve, a first electromagnetic ball valve, a second electromagnetic ball valve, and a servo valve; The servo valve in the servo hydraulic unit is connected to the servo cylinder; the servo valve repeatedly switches oil inlet and outlet at its P port and T port under the control of the controller; the oil circuit pressure value is regulated by the first relief valve and the second relief valve, wherein the first relief valve regulates the high point pressure and the second relief valve regulates the low point pressure; The servo hydraulic unit includes: a solenoid valve, a pressure sensor, a high-pressure filter, an oil pump, an air cooler, and an oil return filter; Both ends of the solenoid valve in the servo hydraulic unit are connected to the servo cylinder, so as to perform inching control on the forward and backward operation of the servo cylinder; The first electromagnetic ball valve is connected to the high-pressure filter and the second relief valve respectively; the second electromagnetic ball valve is connected to the electromagnetic valve and the servo valve respectively; the obtained oil circuit pressure value is fed back to the controller by the pressure sensor, so that the controller can control the maximum value, minimum value and pulsation frequency of the dynamic tensile force applied to the sample; The oil pump is driven by a motor to provide hydraulic oil; the high-pressure filter and the return oil filter filter the inlet oil and return oil of the oil pump respectively; the air cooler is used to cool the return oil.

2. The erosion wear testing system according to claim 1, characterized in that: The erosion chamber comprises: a support tube; A nozzle, a first sample chuck and a second sample chuck are placed and fixed in the support tube of the erosion chamber; the sample is fixed between the first sample chuck and the second sample chuck by bolts; the nozzle is used to spray out the sand mixing liquid to impact the sample; and the cone drain placed under the support tube can discharge the sand mixing liquid.

3. The erosion wear testing system according to claim 2, characterized in that: The servo cylinder of the erosion chamber is threadedly connected to the first sample chuck.

4. The erosion wear testing system according to claim 2, characterized in that: The tension sensor of the erosion chamber is threadedly connected to the second sample chuck.

5. The erosion wear testing system according to claim 1, characterized in that: The sand mixing and sewage discharge unit comprises: a sand storage tank, a stirring motor, a stirring fan blade, a sewage discharge valve, a sewage discharge pump, and a sampling valve; The sand storage tank in the sand mixing and sewage discharge unit contains sand and water configured in a predetermined ratio; the stirring motor is fixedly installed above the sand storage tank, and the stirring motor drives the fan blades to stir and mix the sand and water to form a sand mixing liquid; the sampling valve is placed on one side of the sand storage tank to check the concentration of the sand mixing liquid; The sampling valve is provided on one side of the sand storage tank, which can check the concentration of the mixed slurry during the sand mixing process; the sewage valve placed at the bottom of the sand storage tank and the sewage pump connected thereto can discharge waste materials.

6. The erosion wear testing system according to claim 5, characterized in that: The sand storage tank in the sand mixing and sewage discharge unit can be connected to the cone drain of the erosion chamber to recover the sand mixing liquid after the test; the sewage valve arranged at the bottom of the sand storage tank and the sewage pump connected to the sewage valve are used to discharge the waste.

7. The erosion wear testing system according to claim 6, characterized in that: The inlet pipeline in the circulation pipeline is connected to the sand storage tank to transport the mixed sand liquid to the mortar pump. The mortar pump controls the speed through a frequency converter to control the inlet flow of the mixed sand liquid; the jet pipeline of the circulation pipeline connects the mortar pump and the nozzle; the return pipeline of the circulation pipeline connects the cone leak and the sand storage tank for circulation.

8. The erosion wear testing system according to claim 7, characterized in that: The jet pipeline is provided with a flow meter, a pressure meter and a temperature meter to monitor the flow parameters of the jet sand mixing liquid.

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