Piston working condition simulation test device and method

Abstract

The present invention provides a piston working condition simulation test device and method, the piston working condition simulation test device includes a piston clamping mechanism, a test base, a thrust loading mechanism and a detection mechanism. The piston clamping mechanism is used to clamp the piston sample and can move linearly back and forth along a first direction. The test base includes a test track provided with a linear slide extending along the first direction. The linear slide can be used to fix the pipeline sample and inject the test medium. The thrust loading mechanism can drive the test base to move toward or away from the piston clamping mechanism along a second direction so that the bottom surface of the piston sample fits with the pipeline sample and applies a load pressure perpendicular to the fitting surface. The second direction intersects with the first direction. The detection mechanism is used to detect the wear of the piston sample and the sliding friction between the piston sample and the pipeline sample. The present invention accurately simulates the actual operating conditions of the piston, improves the accuracy of the piston life assessment, and greatly avoids the risk of piston failure.

Description

Technical Field

[0001] The present invention belongs to the technical field of test and experiment, and in particular relates to a piston working condition simulation test device and method. Background Art

[0002] During construction, concrete pump trucks rely primarily on the reciprocating motion of the piston within the concrete cylinder to push concrete into the delivery pipe. The piston is a key, high-frequency, and vulnerable component of concrete pumping equipment. Its operating environment is extremely harsh, typically requiring long periods of continuous reciprocating motion under harsh and complex conditions such as high temperature, high pressure, and high sand content. Currently, piston life is primarily determined through vehicle loading assessments. However, the operating conditions of the pistons on each assessment vehicle are inconsistent, and the complexity of the piston and concrete cylinder motion conditions poses significant challenges to piston life assessments, resulting in inaccurate piston life assessments and the inability to predict piston failures in advance.

[0003] However, existing piston life evaluation test devices cannot accurately simulate the actual operating conditions of the piston, resulting in inaccurate evaluation of the piston life. Summary of the Invention

[0004] The main purpose of the present invention is to propose a piston operating condition simulation test device and method, which aims to solve or at least partially solve the technical problem that the existing technology cannot accurately simulate the actual operating conditions of the piston, resulting in inaccurate piston life assessment.

[0005] In order to achieve the above-mentioned object, the present invention provides a piston working condition simulation test device, wherein the piston working condition simulation test device comprises:

[0006] A piston clamping mechanism, used for clamping the piston sample and capable of linear reciprocating movement along a first direction;

[0007] The test base comprises a test track provided with a linear chute extending along a first direction, wherein the linear chute can be used to fix a pipeline sample and inject a test medium;

[0008] a thrust loading mechanism capable of driving the test base to move toward or away from the piston clamping mechanism in a second direction so that the bottom surface of the piston sample and the pipe sample are in contact with each other and a load pressure perpendicular to the contact surface is applied, wherein the second direction intersects the first direction; and

[0009] The detection mechanism is used to detect the wear amount of the piston sample and the sliding friction between the piston sample and the pipe sample.

[0010] In an embodiment of the present invention, the test base also includes a base body, the base body is provided with a medium storage tank for holding the test medium, the test track is installed on the bottom wall of the medium storage tank and is provided with a medium circulation hole, and the linear slide groove is connected to the medium storage tank through the medium circulation hole.

[0011] In an embodiment of the present invention, the test base further includes two partition plates arranged along the third direction, the partition plates being connected between the outer peripheral wall of the test track and the inner side wall of the medium storage tank, and dividing the medium storage tank into two mutually unconnected accommodating chambers, and the number of medium circulation holes is multiple and respectively opened at both ends of the test track in the first direction;

[0012] The third direction intersects both the second direction and the first direction.

[0013] In an embodiment of the present invention, the test base further includes a heating tube for heating the base body. The heating tube passes through the base body. An interface of the heating tube is exposed at the periphery of the base body and is used for connecting to an external heating device.

[0014] In an embodiment of the present invention, the piston working condition simulation test device further includes a mounting frame, and the piston clamping mechanism includes:

[0015] a holder for holding the piston sample from the periphery; and

[0016] The linear drive assembly is installed on the top of the mounting frame and is fixedly connected to the clamp. The linear drive assembly can control the distance and frequency of the reciprocating sliding of the piston sample.

[0017] In an embodiment of the present invention, the linear drive assembly includes a slide rail, a slide table, and a driving member for driving the slide table to slide linearly back and forth along the slide rail. The slide rail is installed on the top of the mounting frame along a first direction. The slide table is slidably connected to the slide rail, and a clamp is installed at the bottom.

[0018] In an embodiment of the present invention, the top end of the thrust loading mechanism is connected to the test base and a pressure sensor is provided at the connection. The pressure sensor can measure the pressure between the thrust loading mechanism and the test base.

[0019] In an embodiment of the present invention, the piston working condition simulation test device also includes a lifting auxiliary frame and multiple guide columns, the guide columns extend along the second direction and are fixedly installed on the mounting frame, the lifting auxiliary frame is fixedly connected to the test base and can slide along the multiple guide columns.

[0020] In an embodiment of the present invention, the detection mechanism includes a displacement sensor and a friction sensor. The displacement sensor can measure the displacement of the test base and detect the wear of the piston sample. The friction sensor is used to measure the sliding friction between the piston sample and the pipe sample.

[0021] In an embodiment of the present invention, the piston working condition simulation test device further includes an oil dripper for dripping oil to lubricate the piston sample, and the oil dripping rate and oil dripping amount of the oil dripper are adjustable.

[0022] In an embodiment of the present invention, a piston working condition simulation test method is further provided, which is applied to the piston working condition simulation test device described above. The piston working condition simulation test method includes:

[0023] Step S10: preparing a piston sample and a pipe sample;

[0024] Step S20: installing the piston sample and the pipe sample in the piston clamping mechanism and the test base respectively;

[0025] Step S30: pouring a test medium into the test base;

[0026] Step S40: pushing the test base toward the piston clamping mechanism along the second direction by the thrust loading mechanism, so that the bottom surface of the piston sample fits with the pipeline sample;

[0027] Step S50: driving the piston sample to linearly reciprocate along a first direction through the piston clamping mechanism, so as to cause reciprocating sliding friction between the bottom surface of the piston sample and the pipe sample and simulate the piston operation condition;

[0028] Step S60: changing the test parameters to simulate different operating conditions of the piston.

[0029] In this embodiment of the present invention, step S10 includes:

[0030] A sample of a first preset width taken along the axis of the piston is a piston sample, and a sample of a second preset width taken along the axis of the pipe is a pipe sample.

[0031] In the embodiment of the present invention, the following steps are further included between step S30 and step S40:

[0032] Turn on the heating tube to heat the test base to the preset temperature.

[0033] In the embodiment of the present invention, the following steps are further included before step S50:

[0034] Open the oiler and drip oil onto the piston sample at the preset oil dripping rate and preset oil dripping volume.

[0035] Through the above technical solution, the piston working condition simulation test device provided by the embodiment of the present invention has the following beneficial effects:

[0036] The piston working condition simulation test device in the present invention can simulate the working state of the piston, detect the wear amount and wear height of the piston sample through the detection mechanism, and realize the rapid evaluation of the piston life under different working conditions, thereby being able to give an early warning of the piston entering the failure state, avoiding the risk of piston failure during the pumping process, which requires the replacement of the piston and the resulting pipe blockage. At the same time, the present invention drives the piston sample to reciprocate inside the linear slide groove filled with the test medium through the driving of the piston clamping mechanism, thereby realizing the simulation of pushing materials during the piston pumping process, and the reciprocating operation of the piston sample is stable and reliable, and the sealing fitting surface formed between the piston sample and the pipeline sample realizes the simulation of the piston sealing assembly state. The piston working condition simulation test device of the present invention accurately simulates the actual operating conditions of the piston, better reflects the wear data of the piston in the test, improves the accuracy of the piston life evaluation, and greatly helps the staff to avoid the risks caused by piston failure during the pumping process.

[0037] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings are used to provide an understanding of the present invention and constitute a part of the specification. Together with the following detailed description, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0039] Figure 1 2 is a schematic structural diagram of a piston working condition simulation test device according to an embodiment of the present invention;

[0040] Figure 2 is a schematic structural diagram of a test base according to an embodiment of the present invention;

[0041] Figure 3 is a schematic diagram of sampling a piston sample cut from a piston according to one embodiment of the present invention;

[0042] Figure 4 is a schematic diagram of sampling a pipeline sample intercepted from a pipeline according to one embodiment of the present invention;

[0043] Figure 5 is a schematic diagram of the installation structure of a piston sample according to an embodiment of the present invention;

[0044] Figure 6 1 is a flow chart of a piston working condition simulation test method according to an embodiment of the present invention.

[0045] Description of Reference Numerals

[0046] Label name Label name 10 Piston sample 25 Heating tube 21 Test base 40 Mounting bracket 20 Pipeline samples 11 Gripper 221 Linear chute 43 Oil dripper 22 test track 13 Slide rails 30 Thrust loading mechanism 14 Slide 23 Base body 15 Drive parts 231 Media storage tank 31 pressure sensor 222 Medium flow hole 41 Lifting auxiliary frame 24 Divider 42 Guide column 51 Displacement Sensor 52 Friction sensor DETAILED DESCRIPTION

[0047] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0048] The following describes a piston working condition simulation test device according to the present invention with reference to the accompanying drawings.

[0049] In the following description of the present invention, the first direction refers to Figure 1 and Figure 2 The first direction is the left and right direction, the second direction is the up and down direction, and the third direction is the front and back direction.

[0050] like Figure 1 As shown, in an embodiment of the present invention, a piston working condition simulation test device is provided, wherein the piston working condition simulation test device includes a piston clamping mechanism, a test base 21, a thrust loading mechanism 30 and a detection mechanism. The piston clamping mechanism is used to clamp the piston sample 10 and can move linearly back and forth in the left and right directions. The test base 21 includes a test track 22 provided with a linear slide 221 extending in the left and right directions. The linear slide 221 can be fixedly placed in the pipeline sample 20 and filled with a test medium. The thrust loading mechanism 30 can drive the test base 21 to move toward or away from the piston clamping mechanism in the vertical direction so that the bottom surface of the piston sample 10 is in contact with the pipeline sample 20 and a load pressure perpendicular to the contact surface is applied. The vertical direction and the left and right direction intersect. The detection mechanism is used to detect the wear of the piston sample 10 and the sliding friction between the piston sample 10 and the pipeline sample 20.

[0051] When conducting a piston working condition simulation test, it is first necessary to remove a piston sample 10 and a pipe sample 20 of appropriate size from the piston and the concrete cylinder pipe respectively, then install the piston sample 10 on the clamping mechanism, and fix the pipe sample 20 in a flat manner on the bottom wall of the linear slide 221, so that the bottom wall of the linear slide 221 is covered with a layer of pipe sample 20 for friction test; after the pipe sample 20 is installed, concrete, water and other test media can be poured into the linear slide 221 to simulate the working environment of the piston under different media; then the thrust loading mechanism 30 is used to push the test base 21 to move toward the piston clamping mechanism in the up and down directions, so that the piston sample 10 is embedded in the linear slide 221 and the bottom surface of the piston sample 10 is in contact with the pipe sample 20; thereafter, the piston clamping mechanism can be used to control the piston sample 10 to move linearly back and forth in the left and right directions, thereby continuously causing the bottom surface of the piston sample 10 to generate sliding friction with the pipe sample 20, so as to simulate the effect of the piston reciprocating in the concrete cylinder pipe and generating sliding wear. During this process, the detection mechanism keeps detecting and monitoring the wear of the piston sample 10 and the sliding friction between the piston sample 10 and the pipe sample 20 .

[0052] The piston working condition simulation test device in the present invention can simulate the working state of the piston, detect the wear amount and wear height of the piston sample 10 through the detection mechanism, and realize the rapid evaluation of the piston life under different working conditions, thereby being able to provide early warning of the piston entering the failure state, avoiding the risk of piston failure during the pumping process, which requires the replacement of the piston and the resulting pipe blockage. At the same time, the present invention drives the piston sample 10 to reciprocate inside the linear slide 221 filled with the test medium through the driving of the piston clamping mechanism to simulate the process of pushing the material during the piston pumping process, and the reciprocating operation of the piston sample 10 is stable and reliable. The sealing fitting surface formed between the piston sample 10 and the pipeline sample 20 realizes the simulation of the piston sealing assembly state. The piston working condition simulation test device of the present invention accurately simulates the actual operating conditions of the piston, better reflects the wear data of the piston in the test, improves the accuracy of the piston life evaluation, and greatly helps the staff to avoid the risks caused by piston failure during the pumping process.

[0053] Among them, since the piston moves in the concrete cylinder pipe in actual working conditions, the wear of the piston comes from the friction between the outer wall of the piston and the inner wall of the concrete cylinder pipe. In order to restore the actual wear effect of the piston, it is necessary to ensure that the outer wall of the piston sample 10 faces the pipe sample 20 and the inner wall of the pipe sample 20 faces the piston sample 10 when installing the piston sample 10 and the pipe sample 20, so that the outer wall of the piston sample 10 can fit the inner wall of the pipe sample 20 after the piston sample 10 is embedded in the linear slide groove 221, thereby simulating the friction effect between the outer wall of the piston and the inner wall of the concrete cylinder pipe in actual working conditions.

[0054] In addition, since the piston and the concrete cylinder pipe are generally an interference fit, the radius of the piston outer wall must be larger than the outer diameter of the inner wall of the concrete cylinder pipe. Therefore, before sliding friction occurs, the outer diameter of the piston sample 10 must be larger than the inner diameter of the pipe sample 20. During the process of the piston clamping mechanism driving the piston sample 10 to slide and rub, the piston sample 10 is continuously worn from the outer wall and the outer diameter is continuously reduced. When the outer diameter of the piston is reduced to the same as the inner diameter of the pipe sample 20, the piston sample 10 is considered to have entered a failure state. By recording the time required for the piston sample 10 to enter a failure state under test conditions, the present application can make an advance estimate of the time it takes for the piston to enter a failure state under actual conditions, thereby avoiding the risk of piston failure during pumping, which requires the replacement of the piston and causes pipe blockage.

[0055] Furthermore, in order to more accurately estimate the piston failure time, the time when the piston enters the failure state under the test conditions and the actual conditions can be compared to establish a parameter connection, such as: H0 = H1 × M, where M is the test coefficient, the actual working condition failure time is H0, and the test condition failure time is H1. When the piston failure time is subsequently calculated, the existing test coefficient M value and the test condition failure time H1 can be used to accurately calculate the actual working condition failure time H0, thereby achieving a more accurate estimation effect.

[0056] In the embodiment of the present invention, Figure 2 As shown, the test base 21 also includes a base body 23, which is provided with a medium storage tank 231 for holding the test medium. The test track 22 is installed on the bottom wall of the medium storage tank 231 and is provided with a medium circulation hole 222. The linear chute 221 is connected to the medium storage tank 231 through the medium circulation hole 222. The test medium flows out of or into the linear chute 221 through different medium circulation holes 222 to simulate the suction and feeding conditions during the piston pumping process. When the piston sample 10 reciprocates in the linear chute 221, the volume on both sides of the linear chute 221 changes continuously, causing the liquid level of the test medium on both sides of the linear chute 221 to change continuously. Based on this, the medium storage tank 231 and the linear chute 221 in the present invention form an inner and outer double-layer medium storage structure. The medium storage tank 231 bears the volume pressure of the linear chute 221 to store the test medium, which greatly reduces the vibration change of the liquid level of the test medium, which is conducive to maintaining the stability of the equipment operation.

[0057] In addition, to allow the piston sample 10 to simulate tests under more complex test media conditions, the test base 21 also includes two partition plates 24 arranged in the front-to-back direction. The partition plates 24 are connected between the outer peripheral wall of the test track 22 and the inner side wall of the medium storage tank 231, and divide the medium storage tank 231 into two mutually unconnected cavities. There are multiple medium circulation holes 222, which are respectively opened at the two ends of the test track 22 in the left and right directions. Workers can add different test media to the two different cavities of the medium storage tank 231. The two different test media enter the two sides of the linear slide 221 through the different medium circulation holes 222 at the two ends of the test track 22 and are separated by the piston sample 10, so that the two sides of the piston sample 10 in the left and right directions are respectively exposed to different test media. The test medium can be water, lithium grease, a blend of water and lithium grease, concrete, and other materials. The medium on both sides of the piston sample 10 can be the same or different.

[0058] It should be noted that when the piston sample 10 slides in the linear groove 221, it needs to keep in contact with the inner wall of the linear groove 221 to prevent the different test media on both sides of the piston sample 10 from contacting and mixing. Therefore, when cutting the piston sample 10 on the piston, it is necessary to control the size of the piston sample 10 according to the width of the linear groove 221. At the same time, in order to ensure the test effect, the liquid level of the test medium in the linear groove 221 needs to be higher than the height of the piston sample 10, but in order to ensure that the test media on both sides do not mix, such as Figure 1 and Figure 5 As shown, the piston sample is clamped to the piston clamping mechanism via a clamp 11. The clamp 11 at the upper end of the piston sample 10 maintains contact with the inner sidewalls of the linear groove 221, isolating the test medium from both sides. Specifically, the clamp 11 is an annular claw-shaped structure with a cavity formed within. During clamping, the annular claws of the clamp 11 grip and secure the piston sample 10 from the periphery, while the outer sidewalls of the clamp 11 in the front-to-back direction maintain contact with the inner sidewalls of the linear groove 221.

[0059] The piston operating condition simulation test apparatus also includes a mounting frame 40. The piston clamping mechanism also includes a linear drive assembly, which is mounted on top of the mounting frame 40 and fixedly connected to the clamp 11. The linear drive assembly can flexibly simulate different concrete pumping conditions by controlling the distance and frequency of the reciprocating sliding of the clamp 11 and the piston sample 10. Preferably, the reciprocating frequency of the piston sample 10 is in the range of 0 to 5 Hz, and the stroke is adjustable in the range of 0 to 500 mm.

[0060] The linear drive assembly includes a slide rail 13, a slide table 14, and a driving member 15 for driving the slide table 14 to slide linearly back and forth along the slide rail 13. The slide rail 13 is mounted on the top of the mounting frame 40 in the left-right direction. The slide table 14 is slidably connected to the slide rail 13, and a clamp 11 is installed at the bottom of the slide table 14. Figure 1 As shown, there are preferably two slide rails 13 and the slide 14 slides on the two parallel slide rails 13. The provision of two slide rails 13 can ensure the stability of the slide 14, reduce vibration during the reciprocating movement of the slide 14 and the clamp 11, and ensure the stability of the sample during the piston test, so as to further realize the accurate simulation of the reciprocating movement of the piston.

[0061] Furthermore, the driving member 15 is preferably a driving mode of a rotating screw plus a servo motor in the prior art. This driving mode has high precision, good durability, and high reliability, and is highly consistent with the working conditions of the technical solution of the present invention. It can be perfectly adapted as a driving member 15 for application in the present invention, but the scope of application of the present invention is not limited to this. It can also be other driving members 15 such as linear motors, worm gears, electric cylinders, and oil cylinders.

[0062] In this embodiment of the present invention, the top end of the thrust loading mechanism 30 is connected to the test base 21, and a pressure sensor 31 is provided at the connection. The pressure sensor 31 can measure the pressure between the thrust loading mechanism 30 and the test base 21, thereby inferring the normal pressure in the vertical direction of the piston sample 10 and the pipe sample 20. The thrust loading mechanism 30 can also raise and lower the test base 21 by setting different displacement heights or thrust load values, and the thrust load value is adjustable from 0 to 5000N.

[0063] The above combined with the attached Figure 1 While the structure and installation of the piston clamping mechanism and thrust loading mechanism 30 of the present invention have been described in detail, the present invention is not limited thereto. Within the technical scope of the present invention, various simple variations of the present invention's technical solution are possible, including combining the specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple variations and combinations should also be considered as disclosed herein and fall within the scope of protection of the present invention.

[0064] In an embodiment of the present invention, the test base 21 further includes a heating tube 25 for heating the base body 23. The heating tube 25 passes through the base body 23, and the interface of the heating tube 25 is exposed on the outer periphery of the base body 23 and is used to connect to an external heating device. The heating tube 25 can provide the temperature required for the test, and can be equipped with a temperature measuring thermocouple for accurate measurement and control of the test temperature of 0 to 100°C. The accuracy of the temperature measurement and control is within ±0.5°C, and the temperature can also be set and recorded. Among them, the present invention does not limit the external heating device connected to the heating tube 25. Common heating devices such as resistance heating, electromagnetic heating, infrared heating, etc. can be applied to the present invention.

[0065] In the embodiment of the present invention, Figure 1 As shown, the piston working condition simulation test device also includes a lifting auxiliary frame 41 and a plurality of guide columns 42. The guide columns 42 extend in the up and down directions and are fixedly mounted on the mounting frame 40. The lifting auxiliary frame 41 is fixedly connected to the test base 21 and can slide along the plurality of guide columns 42. In this way, the plurality of guide columns 42 can ensure that the lifting auxiliary frame 41 remains stable in the horizontal direction during the up and down sliding process, thereby avoiding the vibration of the lifting auxiliary frame 41. The test base 21 is also improved in stability and shock resistance during operation through the fixed connection with the lifting auxiliary frame 41, thereby effectively ensuring the accuracy and stability of the piston working condition simulation.

[0066] In this embodiment of the present invention, the detection mechanism includes a displacement sensor 51 and a friction sensor 52. The displacement sensor 51 is mounted on the mounting bracket 40 and is capable of measuring the displacement of the test base 21 and detecting the wear of the piston sample 10. Specifically, when the thrust loading mechanism 30 applies a constant thrust load to the test base 21 from below, the test base 21 continuously moves upward as the piston sample 10 wears, and the upward movement distance is equal to the thickness of the worn piston sample 10. Therefore, the displacement of the test base 21 can reflect the wear of the piston sample 10. The friction sensor 52 is mounted on the clamp 11 and is capable of measuring the sliding friction between the piston sample 10 and the pipe sample 20.

[0067] Furthermore, the displacement sensor 51 can have an accuracy of less than 0.1 mm and a measuring range of 0 to 100 cm. Furthermore, the displacement sensor 51 is preferably a grating scale, but the scope of application of the present invention is not limited thereto. Other displacement sensors such as a drawstring displacement sensor, an LVDT displacement sensor, and a magnetoelastic displacement sensor may also be used.

[0068] In an embodiment of the present invention, the piston operating condition simulation test device also includes an oil dropper 43 for dripping oil to lubricate the piston sample 10. The oil dropper 43 is filled with lubricating grease for the piston and can simulate the grease adding condition during the piston operation process by adjusting the oil dripping rate and oil dripping amount.

[0069] This test device can change the frequency of the reciprocating motion of the piston sample 10, so as to simulate the working conditions of different concrete pumping frequencies; by changing the heating temperature of the heating tube 25, the working conditions of different concrete pumping temperatures can be simulated; by changing the type and ratio of the test medium, the working conditions of different pumping material conditions can be simulated; by the type, rate and amount of oil dripping, the working conditions of different concrete pumping lubrication conditions can be simulated; by changing the load of the thrust loading mechanism, the working conditions of different concrete pumping pressures can be simulated; by changing the material of the piston sample 10, the working conditions of different materials of the concrete piston can be simulated; by changing the roughness of the pipe sample 20 or the coaxiality with the piston, the working conditions of concrete cylinder strain, wear or unqualified coaxiality can be simulated; by changing the parallelism of the central axis when the piston sample 10 and the pipe sample 20 are assembled, the working conditions when the concrete is assembled on different axes can be simulated.

[0070] Moreover, under different working condition simulation test conditions, the thickness reduction of the piston samples is inconsistent, which indicates that the piston wear conditions under different working conditions are inconsistent. The piston working condition simulation test device of the present invention can be used to evaluate the piston life under different working conditions.

[0071] like Figure 6As shown, a piston working condition simulation test method is also proposed, which is applied to the piston working condition simulation test device as described above. The piston working condition simulation test method includes:

[0072] Step S10: preparing a piston sample 10 and a pipe sample 20;

[0073] Step S20: installing the piston sample 10 and the pipe sample 20 in the piston clamping mechanism and the test base 21 respectively;

[0074] Step S30: pouring a test medium into the test base 21;

[0075] Step S40: The test base 21 is pushed by the thrust loading mechanism 30 to move in the up-down direction toward the piston clamping mechanism so that the bottom surface of the piston sample 10 fits with the pipe sample 20;

[0076] Step S50: driving the piston sample 10 to move linearly back and forth in the left and right directions through the piston clamping mechanism, so as to cause reciprocating sliding friction between the bottom surface of the piston sample 10 and the pipe sample 20 and simulate the piston operation condition;

[0077] Step S60: changing the test parameters to simulate different operating conditions of the piston.

[0078] When simulating the operating conditions of the piston, it is necessary to use a detection mechanism to detect the wear amount and wear height of the piston sample 10 to achieve a rapid assessment of the piston life under different working conditions, and then provide early warning of the piston entering a failure state, avoiding piston failure during the pumping process, resulting in the risk of pipe blockage due to the need to replace the piston.

[0079] The piston working condition simulation test method proposed in the present invention drives the piston sample 10 to reciprocate inside the linear slide groove 221 filled with the test medium through the drive of the piston clamping mechanism, accurately realizing the simulation of pushing materials during the piston pumping process, better reflecting the wear data of the piston in the test, improving the accuracy of the piston life assessment, and greatly helping the staff to avoid the risk of piston failure during the pumping process.

[0080] The thrust loading mechanism 30 operates in two modes: a specified displacement and a specified thrust, each used for a different test method. Specifically, when performing a predictive test on the failure time of the piston, the thrust loading mechanism 30 needs to specify a fixed displacement to push the test base 21 and the pipe sample 20 on the test base 21 to a specified position and keep them stationary. After the piston sample 10 is worn out and fails, there is no friction between the piston sample 10 and the pipe sample 20. The friction sensor 52 displays 0 friction, and the failure time of the piston sample 10 is recorded. The test is completed. When the relationship between the amount of wear of the piston and the test time is measured, the thrust loading mechanism 30 needs to specify a fixed thrust to continuously push the test base 21 and the pipe sample 20 on the test base 21 upward, so that friction is maintained between the piston sample 10 and the pipe sample 20. The wear of the piston sample 10 is measured by the displacement sensor 51, and the relationship between the wear of the piston sample 10 and the test time is obtained. The test is completed.

[0081] In the embodiment of the present invention, Figure 3 and Figure 4 A schematic diagram of sampling a piston and a concrete cylinder pipe is shown. Step S10 includes cutting a sample of a first preset width along the axis of the piston, namely the piston sample 10, and cutting a sample of a second preset width along the axis of the pipe, namely the pipe sample 20. These preset widths must ensure that the piston sample 10 and the pipe sample 20 fit snugly against the inner wall of the linear chute 221. This prevents mixing of the test media on both sides of the pipe sample 20 as it slides within the linear chute 221. The first and second preset widths in the present invention can be determined based on actual needs and are preferably 1 to 5 cm.

[0082] In an embodiment of the present invention, the steps between step S30 and step S40 also include: turning on the heating tube 25 to heat the test base 21 to a preset temperature, and after the test medium is poured into the test base 21, the test base 21 can be heated. After ensuring that the working condition of the piston sample 10 is at the set temperature, the thrust loading mechanism 30 and the piston clamping mechanism can be started to perform a reciprocating friction test.

[0083] It should be noted that, in order to ensure the grease addition condition of the piston sample 10 during the test operation, before performing step S50, it is necessary to open the oil dripper 43 and drip oil on the piston sample 10 according to the preset oil dripping rate and oil dripping amount.

[0084] The piston working condition simulation test device proposed in the present invention is not limited to being used in the working condition simulation of concrete pistons, but can also be used in friction and wear tests of other materials.

[0085] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0086] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0087] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0088] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A piston working condition simulation test device, characterized in that: The piston working condition simulation test device comprises: A piston clamping mechanism, used for clamping the piston sample (10) and capable of linear reciprocating movement along a first direction; A test base (21) includes a test track (22) provided with a linear chute (221) extending along the first direction, wherein the linear chute (221) can be fixedly placed in the pipeline sample (20) and filled with a test medium; a thrust loading mechanism (30) capable of driving the test base (21) to move toward or away from the piston clamping mechanism along a second direction so that the bottom surface of the piston sample (10) and the pipe sample (20) are in contact with each other and a load pressure perpendicular to the contact surface is applied, wherein the second direction intersects the first direction; and A detection mechanism for detecting the wear amount of the piston sample (10) and the sliding friction between the piston sample (10) and the pipe sample (20); The test base (21) further comprises a base body (23) and two partition plates (24) respectively arranged along a third direction, the base body (23) being provided with a medium storage tank (231) for containing a test medium, the test track (22) being mounted on the bottom wall of the medium storage tank (231) and being provided with a medium circulation hole (222), the linear slide groove (221) being connected to the medium storage tank (231) through the medium circulation hole (222); the partition plate (24) being connected between the outer peripheral wall of the test track (22) and the inner side wall of the medium storage tank (231), and dividing the medium storage tank (231) into two mutually unconnected accommodating cavities, the number of the medium circulation holes (222) being multiple and being respectively provided at both ends of the test track (22) in the first direction; The third direction intersects with both the second direction and the first direction, the first direction is the left-right direction, the second direction is the up-down direction, and the third direction is the front-back direction; the piston clamping mechanism controls the piston sample (10) to move linearly back and forth in the left-right direction, thereby continuously causing the bottom surface of the piston sample (10) to generate sliding friction with the pipe sample (20), so as to simulate the effect of the piston reciprocating in the concrete cylinder pipe and generating sliding wear.

2. The piston working condition simulation test device according to claim 1, characterized in that: The test base (21) further includes a heating tube (25) for heating the base body (23). The heating tube (25) passes through the base body (23). An interface of the heating tube (25) is exposed at the periphery of the base body (23) and is used for connecting to an external heating device.

3. The piston working condition simulation test device according to claim 1, characterized in that: The piston working condition simulation test device further comprises a mounting frame (40), and the piston clamping mechanism comprises: A clamp (11) clamping the piston sample (10) from the outer periphery; and A linear drive assembly is mounted on the top of the mounting frame (40) and fixedly connected to the clamp (11). The linear drive assembly can control the distance and frequency of the reciprocating sliding of the piston sample (10).

4. The piston working condition simulation test device according to claim 3, characterized in that: The linear drive assembly includes a slide rail (13), a slide table (14), and a drive member (15) for driving the slide table (14) to slide linearly back and forth along the slide rail (13). The slide rail (13) is installed on the top of the mounting frame (40) along the first direction. The slide table (14) is slidably connected to the slide rail (13), and the clamp (11) is installed at the bottom.

5. The piston working condition simulation test device according to claim 3, characterized in that: The top end of the thrust loading mechanism (30) is connected to the test base (21) and a pressure sensor (31) is provided at the connection point. The pressure sensor (31) can measure the pressure between the thrust loading mechanism (30) and the test base (21).

6. The piston working condition simulation test device according to claim 3, characterized in that: The piston working condition simulation test device further includes a lifting auxiliary frame (41) and a plurality of guide columns (42), wherein the guide columns (42) extend along the second direction and are fixedly mounted on the mounting frame (40), and the lifting auxiliary frame (41) is fixedly connected to the test base (21) and can be guided and slid along the plurality of guide columns (42).

7. The piston working condition simulation test device according to any one of claims 1 to 6, characterized in that: The detection mechanism includes a displacement sensor (51) and a friction sensor (52). The displacement sensor (51) can measure the displacement of the test base (21) and detect the wear of the piston sample (10). The friction sensor (52) is used to measure the sliding friction between the piston sample (10) and the pipe sample (20).

8. The piston working condition simulation test device according to any one of claims 1 to 6, characterized in that: The piston working condition simulation test device further comprises an oil dripper (43) for dripping oil to lubricate the piston sample (10), and the oil dripping rate and oil dripping amount of the oil dripper (43) are adjustable.

9. A piston working condition simulation test method, characterized in that: Applied to the piston working condition simulation test device according to any one of claims 1 to 8, the piston working condition simulation test method includes: Step S10: preparing a piston sample (10) and a pipe sample (20); Step S20: installing the piston sample (10) and the pipe sample (20) in the piston clamping mechanism and the test base (21) respectively; Step S30: pouring a test medium into the test base (21); Step S40: pushing the test base (21) along the second direction toward the piston clamping mechanism through the thrust loading mechanism (30) so that the bottom surface of the piston sample (10) fits the pipe sample (20); Step S50: driving the piston sample (10) to move linearly back and forth in a first direction through the piston clamping mechanism, so as to cause reciprocating sliding friction between the bottom surface of the piston sample (10) and the pipe sample (20) and simulate the piston operation condition; Step S60: changing the test parameters to simulate different operating conditions of the piston.

10. The piston working condition simulation test method according to claim 9, characterized in that: The step S10 includes: A sample of a first preset width taken along the axis of the piston is the piston sample (10), and a sample of a second preset width taken along the axis of the pipe is the pipe sample (20).

11. The piston working condition simulation test method according to claim 9, characterized in that: The test base (21) further includes a heating tube (25) for heating the base body (23), wherein the heating tube (25) passes through the base body (23), and an interface of the heating tube (25) is exposed outside the periphery of the base body (23) and is used for connecting to an external heating device; The following steps are included between step S30 and step S40: The heating tube (25) is turned on to heat the test base (21) to a preset temperature.

12. The piston working condition simulation test method according to claim 9, characterized in that: The piston working condition simulation test device further comprises an oil dripper (43) for dripping oil to lubricate the piston sample (10), and the oil dripping rate and oil dripping amount of the oil dripper (43) are adjustable; The step S50 also includes the following steps: The oil dripper (43) is turned on and oil is dripped onto the piston sample (10) according to a preset oil dripping rate and a preset oil dripping amount.

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