Concrete piston wear resistance testing device and test method

Abstract

The present invention belongs to the technical field of engineering machinery, and specifically, relates to a concrete piston wear resistance testing device and testing method. The concrete piston wear resistance testing device includes a fluid container, a friction wheel, and a friction pressure mechanism. The fluid container includes a fluid inlet arranged at the top and a fluid outlet arranged at the bottom; the friction wheel is arranged in the cavity of the fluid container and can rotate around the central axis; the friction pressure mechanism includes a pressure driving member and a sample clamp, and one end of the pressure driving member is equipped with a sample clamp and extends into the cavity of the fluid container; wherein, the sample clamp is located on the circumferential outside of the friction wheel, and the pressure driving member can pressurize the piston sample clamped between the friction wheel and the sample clamp. The device can simulate the operating conditions of the concrete piston, thereby more accurately evaluating the service life of the concrete piston.

Description

Technical Field

[0001] The present invention belongs to the technical field of engineering machinery, and in particular relates to a concrete piston wear resistance testing device and a testing method. Background Art

[0002] During operation, concrete pumping equipment primarily relies on the reciprocating motion of a concrete piston within a concrete cylinder to draw in or pump out concrete. During this process, the concrete piston rubs against the inner wall of the cylinder. The wear resistance of the concrete piston determines its lifespan, and therefore the replacement frequency of the concrete piston in concrete pumping equipment. However, existing wear resistance testing equipment struggles to simulate the operating conditions of concrete pistons, resulting in inaccurate estimates of concrete piston lifespan. Summary of the Invention

[0003] In response to the above-mentioned defects or shortcomings of the prior art, the present invention provides a concrete piston wear resistance testing device and testing method. Since the concrete piston wear resistance testing device can simulate the operating conditions of a concrete piston, the wear resistance data obtained by testing with the concrete piston wear resistance testing device is relatively accurate, thereby being able to more accurately evaluate the service life of a concrete piston made of the same material as the piston sample.

[0004] To achieve the above-mentioned object, the present invention provides a first aspect of a concrete piston wear resistance testing device, the concrete piston wear resistance testing device comprising:

[0005] A fluid container comprising a fluid inlet disposed at the top end and a fluid outlet disposed at the bottom end;

[0006] a friction wheel disposed in the cavity of the fluid container and capable of rotating about a central axis; and

[0007] The friction pressure mechanism includes a pressure driving member and a sample clamp, wherein the sample clamp is installed at one end of the pressure driving member and extends into the cavity of the fluid container;

[0008] The sample holder is located outside the friction wheel in the circumferential direction, and the pressure driving component can pressurize the piston sample clamped between the friction wheel and the sample holder.

[0009] Optionally, the concrete piston wear resistance testing device further includes a temperature control system for controlling the temperature of the fluid medium in the fluid container, the temperature control system including:

[0010] A heating unit is embedded in the outer wall of the fluid container;

[0011] a temperature sensing unit located in the cavity of the fluid container; and

[0012] The processing unit is connected to the heating unit and the temperature sensing unit, and is used to control the operation of the heating unit according to the temperature data detected by the temperature sensing unit.

[0013] Optionally, the outer peripheral wall of the fluid container includes a heat-conducting layer located on the inner side, a protective layer located on the outer side, and a heat-insulating layer located between the heat-conducting layer and the protective layer, and the heating unit is sandwiched between the heat-conducting layer and the heat-insulating layer.

[0014] Optionally, the temperature sensing unit is arranged on the sample fixture.

[0015] Optionally, the concrete piston wear resistance testing device further includes a stirring paddle located in the cavity of the fluid container.

[0016] Optionally, the stirring paddle and the friction wheel are coaxially arranged.

[0017] Optionally, the pressure driving member is arranged along the radial direction of the friction wheel.

[0018] A second aspect of the present invention provides a method for testing the wear resistance of a concrete piston. The method employs the above-mentioned concrete piston wear resistance testing device and comprises:

[0019] Install the piston sample on the sample holder;

[0020] Inject the fluid medium into the fluid container until the friction wheel is immersed;

[0021] Debug operating parameters;

[0022] Starting the friction wheel and applying pressure to the driving member so that the piston sample is rubbed;

[0023] After running for a preset test time, the wear amount of the piston sample is detected.

[0024] Optionally, the operating parameters include the force applied to the piston sample and the rotational speed of the friction wheel, and the force applied to the piston sample is the pressure applied to the piston sample by the pressure driving component.

[0025] Optionally, the debugging operation parameters include:

[0026] Determine the force curve of the piston sample according to the pre-measured pumping pressure curve;

[0027] Determine the friction wheel speed curve based on the pre-measured pumping frequency curve;

[0028] Among them, the piston sample force curve is the proportion of the operating time of different piston sample force values ​​in the preset test time, the friction wheel speed curve is the proportion of the operating time of different friction wheel speed values ​​in the preset test time, the pumping pressure curve is the proportion of the operating time of different pumping pressure values ​​in the pumping time, and the pumping frequency curve is the proportion of the operating time of different pumping frequency values ​​in the pumping time.

[0029] Optionally, the concrete piston wear resistance testing device further includes a temperature control system for controlling the temperature of the fluid medium in the fluid container, the operating parameters further include the fluid medium temperature, and the concrete piston wear resistance testing method further includes starting the temperature control system after debugging the operating parameters.

[0030] In the present invention, a friction wheel simulates the concrete cylinder in concrete pumping equipment. A pressure-driving component applies external pressure to a piston sample sandwiched between a sample fixture and the friction wheel to simulate the pressure experienced by the concrete piston within the concrete cylinder during pumping. The rotational speed of the friction wheel is controlled to simulate the pumping frequency of the concrete piston within the concrete cylinder. A fluid container is used to hold a fluid medium, thereby simulating the working medium environment of the concrete piston. This demonstrates that the concrete piston wear resistance testing device can simulate the actual operating conditions of a concrete piston. Therefore, the wear resistance data obtained from piston samples tested using this device is relatively accurate, enabling a more accurate assessment of the service life of concrete pistons made of the same material as the piston sample.

[0031] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide a further 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:

[0033] Figure 1 A schematic diagram of a concrete piston wear resistance testing device provided according to a specific embodiment of the present invention;

[0034] Figure 2 The present invention provides a flowchart of a method for testing the wear resistance of a concrete piston according to a specific embodiment of the present invention.

[0035] Explanation of the accompanying symbols: 10, fluid container; 11, fluid inlet; 12, fluid outlet; 20, friction wheel; 30, friction pressure mechanism; 31, pressure driving component; 32, sample clamp; 40, temperature control system; 41, heating unit; 42, temperature sensing unit; 50, piston sample; 60, stirring paddle. DETAILED DESCRIPTION

[0036] The following describes the specific implementation of the embodiment of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the embodiment of the present invention and is not used to limit the embodiment of the present invention.

[0037] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0038] In the embodiments of the present invention, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used to describe the relative positional relationships of components in the directions shown in the drawings or in the vertical, perpendicular or gravity directions.

[0039] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with exemplary embodiments.

[0040] Figure 1 This is a schematic diagram of a concrete piston wear resistance testing device provided according to a specific embodiment of the present invention. Figure 1 As shown, the present invention provides a concrete piston wear resistance testing device on one hand, which includes a fluid container 10 , a friction wheel 20 and a friction pressure mechanism 30 .

[0041] The fluid container 10 includes a fluid inlet 11 at the top and a fluid outlet 12 at the bottom. A friction wheel 20 is disposed within the fluid container 10 and is rotatable about its central axis. A friction pressure mechanism 30 includes a pressure drive member 31 and a sample holder 32. The pressure drive member 31 has the sample holder 32 mounted on one end and extends into the fluid container 10. The sample holder 32 is located circumferentially outside the friction wheel 20. The pressure drive member 31 is capable of applying pressure to a piston sample 50 sandwiched between the friction wheel 20 and the sample holder 32.

[0042] Specifically, a fluid medium can enter the cavity of a fluid container 10 through a fluid inlet 11 and flow out through a fluid outlet 12. The fluid container 10 is used to hold a fluid medium (e.g., concrete). In this embodiment, a friction wheel 20 and a friction pressure mechanism 30 cooperate to simulate the reciprocating motion of a concrete piston within a concrete cylinder. Specifically, the friction wheel 20 replaces the concrete cylinder, and a pressure-applying drive member 31 applies external pressure to a piston sample 50 sandwiched between a sample holder 32 and the friction wheel 20 to simulate the pressure experienced by the concrete piston within the concrete cylinder during pumping. The rotational speed of the friction wheel 20 is controlled to simulate the pumping frequency of the concrete piston within the concrete cylinder. The fluid medium within the fluid container 10 can be concrete. Adjusting the material ratio within the fluid medium can simulate material conditions. The friction wheel 20 and the piston sample 50 both operate within the fluid medium, thereby simulating the working medium environment of the concrete piston. It can be seen that the concrete piston wear resistance testing device can simulate the actual operating conditions of the concrete piston. Therefore, the wear resistance data of the piston sample 50 obtained by testing with the concrete piston wear resistance testing device is more accurate, so that the service life of the concrete piston with the same material as the piston sample 50 can be more accurately evaluated.

[0043] It should be noted that the sample fixture 32 is used to securely mount the piston sample 50 to prevent it from becoming dislodged during the friction process. Those skilled in the art can design the sample fixture 32 based on the structural characteristics of the piston sample 50 to ensure that the sample fixture 32 secures the piston sample 50 while avoiding interference with the friction wheel 20. Furthermore, it should be noted that during operation of the concrete pumping equipment, the lip of the concrete piston contacts the concrete cylinder, so the piston sample 50 can be removed from the lip of the concrete piston.

[0044] exist Figure 1 In the illustrated embodiment, the fluid container 10 is U-shaped. It should be noted that the shape of the fluid container 10 is not limited thereto, and includes, for example, a rectangular or hemispherical shape with an open top.

[0045] Furthermore, the concrete piston wear resistance testing device also includes a temperature control system 40 for controlling the temperature of the fluid medium within the fluid container 10. The temperature control system 40 includes a heating unit 41, a temperature sensing unit 42, and a processing unit. The heating unit 41 is embedded in the outer wall of the fluid container 10. The temperature sensing unit 42 is located within the cavity of the fluid container 10. The processing unit is connected to the heating unit 41 and the temperature sensing unit 42 and is configured to control the operation of the heating unit 41 based on the temperature data detected by the temperature sensing unit 42.

[0046] Specifically, the fluid medium in the fluid container 10 is heated by the heating unit 41. When the temperature sensing unit 42 detects that the temperature of the fluid medium has reached a preset temperature range, the processing unit causes the heating unit 41 to stop heating. When the temperature sensing unit 42 detects that the temperature of the fluid medium has fallen below the lower limit of the preset temperature range, the processing unit causes the heating unit 41 to resume heating. This maintains the fluid medium within the preset temperature range to simulate the ambient temperature during actual concrete piston operation.

[0047] In an optional embodiment, the outer peripheral wall of the fluid container 10 includes a heat conduction layer located on the inner side, a protective layer located on the outer side, and an insulation layer located between the heat conduction layer and the protective layer, and the heating unit 41 is sandwiched between the heat conduction layer and the insulation layer.

[0048] Specifically, the outer wall of the fluid container 10 is composed of multiple layers of materials. The heating unit 41 is located between the heat conduction layer and the insulation layer. The heat emitted by the heating unit 41 is radiated to the fluid medium through the heat conduction layer. The insulation layer prevents the fluid medium from losing temperature too quickly, and the protective layer protects the insulation layer.

[0049] It should be noted that, in this embodiment, the internal and external relationships of the layers in the outer peripheral wall of the fluid container 10 are determined based on the center of the fluid container 10 .

[0050] In this embodiment, the heat conduction layer is a metal material layer with good thermal conductivity, including, for example, a stainless steel layer, a brass layer, etc. The insulation layer is a thermal insulation material layer with good thermal insulation performance, including, for example, a thermal insulation foam layer, a thermal insulation cotton layer, etc. The protective layer is a metal layer, including, for example, a stainless steel layer, a cast iron layer, etc.

[0051] In an optional embodiment, the temperature sensing unit 42 is disposed on the sample holder 32. Specifically, the temperature sensing unit 42 is disposed close to the piston sample 50 to ensure that the obtained temperature data is closer to the actual situation.

[0052] It should be noted that in the above-mentioned embodiment, the heating unit 41 is preferably an electric heating member, including, for example, an electric heating resistor, an electric heating ceramic, etc. The temperature sensing unit 42 is preferably a temperature sensor, including, for example, a temperature measuring probe, etc. The processing unit may include, but is not limited to: a general-purpose processor, a dedicated processor, a conventional processor, a digital signal processor (DSP), multiple microprocessors, one or more microprocessors associated with a DSP core, a controller, a microcontroller, a single-chip microcomputer, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) circuit, and any other type of integrated circuit (IC).

[0053] In the present invention, the concrete piston wear resistance testing device further includes a stirring paddle 60 located in the cavity of the fluid container 10. Specifically, during the test process, the stirring paddle 60 continuously stirs the fluid medium to prevent the fluid medium from condensing.

[0054] In the present invention, the stirring paddle 60 is coaxially arranged with the friction wheel 20. This arrangement allows the stirring paddle 60 and the friction wheel 20 to be installed on the same input shaft. In addition, during the test, the continuous rotation of the stirring paddle 60 can also cause the fluid medium near the friction wheel 20 to flow to the piston sample 50, ensuring that the piston sample 50 is surrounded by the fluid medium.

[0055] In the present invention, the pressure driving member 31 is arranged along the radial direction of the friction wheel 20. This arrangement ensures that the direction of the pressure applied by the pressure driving member 31 is the radial direction of the friction wheel 20, avoiding the pressure applied to the piston sample 50 from being biased.

[0056] In this embodiment, the pressure driving component 31 preferably adopts a hydraulic thrust rod, including, for example, an oil cylinder, etc. It should be noted that the pressure driving component 31 is not limited to this, and includes, for example, an electric push rod, etc., which are not listed one by one here.

[0057] Figure 2 This is a flowchart of a method for testing the wear resistance of a concrete piston according to a specific embodiment of the present invention. Figure 2 As shown, the second aspect of the present invention provides a method for testing the wear resistance of a concrete piston. The method adopts the above-mentioned concrete piston wear resistance testing device and comprises the following steps:

[0058] S11: Mount the piston sample 50 on the sample holder 32;

[0059] S12: injecting the fluid medium into the fluid container 10 until the friction wheel 20 is immersed;

[0060] S13: Debugging operating parameters;

[0061] S14: starting the friction wheel 20 and applying pressure to the driving member 31 so that the piston sample 50 is rubbed;

[0062] S15: After running for a preset test time, the wear amount of the piston sample 50 is detected.

[0063] Specifically, before applying this method for testing, a friction wheel 20 made of the same material as the concrete cylinder must be installed in the concrete piston wear resistance testing device. The appropriate friction wheel 20 can be selected based on the concrete cylinder to which the piston sample 50 (taken from the concrete piston) is actually adapted. As previously mentioned, the aforementioned concrete piston wear resistance testing device can simulate the actual operating conditions of a concrete piston. Therefore, the testing method performed on this device can obtain relatively accurate wear data, thereby evaluating the service life of the concrete piston.

[0064] It should be noted that there is no particular order between step S12 and step S13 , and it is only necessary to ensure that step S13 is before step S14 . The above step order is for the convenience of explanation.

[0065] In an optional embodiment, the concrete piston wear resistance testing device does not have a temperature control system 40. In step S13, the operating parameters include the piston sample force and the friction wheel speed. The piston sample force is the pressure applied by the pressure driving component 31 to the piston sample 50.

[0066] Furthermore, the piston wear resistance testing apparatus includes a temperature control system 40 for controlling the temperature of the fluid medium in the fluid container 10. The operating parameters also include the fluid medium temperature. After step S13, the temperature control system 40 is activated to control the fluid medium temperature to a suitable level. In this embodiment, the temperature control system 40 controls the fluid medium temperature to a range of 70°C to 95°C.

[0067] It should be noted that, in this embodiment, the fluid medium includes abrasive material and lubricating oil. Specifically, the fluid medium is mainly composed of water, fine sand, powder and lubricating oil, wherein the lubricating oil is the lubricating material in the fluid medium. By controlling the amount of lubricating oil added, the wear of the concrete piston under different lubrication conditions is simulated.

[0068] Fine sand and powder serve as abrasive materials in the fluid medium. Different combinations of fine sand and powder can be used to simulate abrasive materials in the fluid medium, thereby verifying the wear effects of fluids of varying abrasiveness on the piston. Examples of fine sand and powder combinations include quartz sand and silica fume, granite sand and granite powder, and limestone sand and limestone powder. In the present invention, the water, fine sand, and powder in the fluid medium are preferably mixed in a mass ratio of 1:1-1.5:0.2-0.5.

[0069] In the present invention, step S13 further includes:

[0070] Determine the force curve of the piston sample according to the pre-measured pumping pressure curve;

[0071] Determine the friction wheel speed curve based on the pre-measured pumping frequency curve;

[0072] Among them, the piston sample force curve is the proportion of the operating time of different piston sample force values ​​in the preset test time, the friction wheel speed curve is the proportion of the operating time of different friction wheel speed values ​​in the preset test time, the pumping pressure curve is the proportion of the operating time of different pumping pressure values ​​in the pumping time, and the pumping frequency curve is the proportion of the operating time of different pumping frequency values ​​in the pumping time.

[0073] The present invention monitors the pumping pressure and frequency of a concrete pumping device during actual operation to calculate the piston sample force and friction wheel speed required for the concrete wear resistance test device, thereby simulating the pumping frequency and pressure experienced by the concrete piston during actual operation. The pumping pressure is the pressure within the concrete cylinder during operation, and the pumping frequency refers to the number of reciprocating movements of the concrete piston within a fixed period.

[0074] During the pumping time, the staff can monitor the pumping pressure value and pumping frequency value of the concrete pumping equipment, so as to obtain the proportion of the operation time of different pumping pressure values ​​in the pumping time and the proportion of the operation time of different pumping frequency values ​​in the pumping time, that is, the pumping pressure curve and the pumping frequency curve are measured in advance, and then, the piston sample force curve and the friction wheel speed curve are converted according to the pre-measured pumping pressure curve and pumping frequency curve.

[0075] An embodiment of determining the force curve of the piston sample and the speed curve of the friction wheel is described in detail below by way of example.

[0076] The operation time of the concrete pumping equipment is 48 hours (i.e., the pumping time). The lubrication condition of the concrete pumping equipment is good during the operation. The mass ratio of water, fine sand, and powder components in the selected fluid medium is 1:1:0.5. The monitoring shows that the operating time of different pumping pressure values ​​accounts for the proportion of the pumping time: 6-7MPa accounts for 0.89%, 7-8MPa accounts for 1.97%, 8-9MPa accounts for 6.81%, 9-10MPa accounts for 16.27%, 1 0-11MPa accounts for 25.35%, 11-12MPa accounts for 17.80%, 12-13MPa accounts for 10.84%, 13-14MPa accounts for 5.81%, 14-15MPa accounts for 5.54%, 15-16MPa accounts for 2.58%, 16-17MPa accounts for 2.49%, 17-18MPa accounts for 1.66%, 18-19MPa accounts for 1.15%, and 19-20MPa accounts for 0.84%.

[0077] The monitoring showed that the proportion of operation time of different pumping frequency values ​​in the pumping time was: 14-15 times / min accounted for 4.68%, 13-14 times / min accounted for 6.91%, 12-13 times / min accounted for 18.07%, 11-12 times / min accounted for 24.91%, 10-11 times / min accounted for 17.78%, 9-10 times / min accounted for 11.25%, 8-9 times / min accounted for 6.82%, 7-8 times / min accounted for 5.85%, 6-7 times / min accounted for 2.92%, and 5-6 times / min accounted for 0.81%.

[0078] Under the condition of known structural dimensional parameters such as the interference of the concrete piston in the concrete pumping equipment, the dimensions of the concrete piston, and the proportion of the operating time of different pumping pressure values ​​in the pumping time and the operating conditions, through mechanical simulation software (such as ANSYS, etc.), it can be obtained that the proportion of the operating time of the stress value acting on the lip of the concrete piston in the pumping time is: 1.78-2.05MPa accounts for 0.89%, 2.05-2.32MPa accounts for 1.97%, 2.32-2.62MPa accounts for 6.81%, 2.62-2.89MPa accounts for 16.2 7%, 2.89-3.15MPa accounted for 25.35%, 3.15-3.43MPa accounted for 17.80%, 3.43-3.74MPa accounted for 10.84%, 3.74-4.01MPa accounted for 5.81%, 4.01-4.29MPa accounted for 5.54%, 4.29-4.55MPa accounted for 2.58%, 4.55-4.78MPa accounted for 2.49%, 4.78-5.05MPa accounted for 1.66%, 5.05-5.31MPa accounted for 1.15%, and 5.31-5.59MPa accounted for 0.84%.

[0079] It is known that the contact area between the friction wheel 20 and the piston sample 50 is 100 mm 2Based on the proportion of the operating time of the stress value acting on the concrete piston lip in the pumping time, the proportion of the operating time of different piston sample stress values ​​in the preset test time was calculated: 17.8-20.5N accounted for 0.89%, 20.5-23.2N accounted for 1.97%, 23.2-26.2N accounted for 6.81%, 26.2-28.9N accounted for 16.27%, 28.9-31.5N accounted for 25.35%, 31.5-34. 3N accounts for 17.80%, 34.3-37.4N accounts for 10.84%, 37.4-40.1N accounts for 5.81%, 40.1-42.9N accounts for 5.54%, 42.9-45.5N accounts for 2.58%, 45.5-47.8N accounts for 2.49%, 47.8-50.5N accounts for 1.66%, 50.5-53.1N accounts for 1.15%, and 53.1-55.9N accounts for 0.84%, which is the force curve of the piston sample.

[0080] Accordingly, under the conditions that the working stroke of the concrete cylinder is 2.1m, the diameter of the friction wheel 20 is 180mm, and the proportion of the working time of different piston sample force values ​​in the preset test time, the distribution of the working time of different friction wheel speed values ​​in the preset test time can be converted: 1.73-1.86r / s accounts for 4.68%, 1.61-1.73r / s accounts for 6.91%, 1.49-1.61r / s accounts for 18 .07%, 1.36-1.49r / s accounted for 24.91%, 1.24-1.36r / s accounted for 17.78%, 1.11-1.24r / s accounted for 11.25%, 0.99-1.11r / s accounted for 6.82%, 0.87-0.99r / s accounted for 5.85%, 0.74-0.87r / s accounted for 2.92%, and 0.62-0.74r / s accounted for 0.81%, which is the friction wheel speed curve.

[0081] Specifically, taking the pumping frequency as 15 times / min, one pumping means that the concrete piston moves back and forth once in the concrete cylinder, so its linear velocity is 15×2.1×2=63m / min, that is, 1.05m / s. Furthermore, the rotational speed of the friction wheel 20 is 1.05÷(0.18×π)=1.86r / s. Similarly, the friction wheel rotational speed values ​​corresponding to other pumping frequency values ​​can be converted.

[0082] It should be noted that in the above embodiment, the pumping pressure value and the pumping frequency value are both range interval values ​​to reduce the amount of parameter calculation. Accordingly, the obtained piston sample force value and friction wheel speed value are also range interval values.

[0083] In addition, in order to facilitate understanding of the process of converting the service life of concrete pistons, an example is given below.

[0084] Assuming the concrete piston wear resistance test device operates for 48 hours (preset test duration) and then stops, during the test, the pressure applied by the pressure-driving member 31 and the rotational speed of the friction wheel 20 are operated according to the piston sample force curve and friction wheel rotational speed curve in the above-described embodiment, respectively. The measured wear of the piston sample 50 is 0.17 mm. It should be noted that the material of the piston sample 50 is consistent with that of the concrete piston in the concrete pumping equipment, and the material of the friction wheel 20 is the same as that of the concrete cylinder in the concrete pumping equipment. The interference fit of the concrete piston in the concrete pumping equipment is 7.22 mm. In addition, the concrete pumping equipment pumps approximately 1,000 cubic meters during the pumping time, so the service life of the concrete piston can be converted to approximately 42,500 cubic meters.

[0085] It should be noted that the interference fit of the concrete piston refers to the thickness of the concrete piston that is allowed to be worn after being installed in the concrete cylinder. Specifically, the concrete piston is worn during the reciprocating movement in the concrete cylinder. When the interference fit gradually decreases to 0, the concrete piston seal fails.

[0086] In addition, the pumping time and the preset test time may not be equal. After measuring the wear of the piston sample 50, the wear of the concrete piston within the pumping time can be converted based on the ratio of the pumping time to the preset test time. The service life can be assessed based on the interference fit. The pumping time and the preset test time can be set according to the situation. Preferably, both the pumping time and the preset test time are not less than 12 hours.

[0087] As described above, the adjustable factors that determine the pressure applied by the pressure-driving component 31 include the contact area between the pump friction wheel 20 and the piston sample 50, etc. The adjustable factors are adjusted to ensure that the pressure range applied by the pressure-driving component 31 is appropriate. Preferably, the maximum pressure applied by the pressure-driving component 31 is preferably 100N.

[0088] As described above, the adjustable factors that determine the rotation speed of the friction wheel 20 include the diameter of the friction wheel 20 , etc. The adjustable factors are adjusted to ensure that the rotation speed range of the friction wheel 20 is appropriate. Preferably, the maximum rotation speed of the friction wheel 20 is 5 r / s.

[0089] In summary, the present invention aims to provide a concrete piston wear resistance testing device and a testing method using the same. The device simulates the actual friction of a concrete piston by controlling the rotational speed of the friction wheel 20 and the pressure applied by the pressure-driving member 31. The concrete piston's experience in different working media is simulated by controlling the ratio of lubricating oil and abrasive material in the injected fluid medium. Furthermore, the temperature control system 40 simulates the concrete piston's external temperature environment. As can be seen, the device can simulate the actual working conditions of a concrete piston, resulting in relatively accurate wear data for the piston sample 50. Furthermore, the service life data for a concrete piston made of the same material as the piston sample 50, as assessed by the measured wear, is relatively accurate.

[0090] The above describes in detail the optional embodiments of the present invention in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the scope of protection of the embodiments of the present invention.

[0091] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations.

[0092] Those skilled in the art will appreciate that all or part of the steps in the above-described embodiments can be implemented by instructing the relevant hardware through a program, which is stored in a storage medium and includes a number of instructions for causing a single-chip microcomputer, chip, or processor to execute all or part of the steps in the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0093] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the embodiments of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A method for testing the wear resistance of concrete pistons, characterized in that: The concrete piston wear resistance test method adopts a concrete piston wear resistance test device, and the concrete piston wear resistance test device includes: A fluid container (10) comprising a fluid inlet (11) disposed at the top end and a fluid outlet (12) disposed at the bottom end; A friction wheel (20) is disposed in the cavity of the fluid container (10) and is capable of rotating around a central axis; A friction pressure mechanism (30) comprises a pressure driving member (31) and a sample holder (32), wherein one end of the pressure driving member (31) is mounted with the sample holder (32) and extends into the cavity of the fluid container (10); and A temperature control system (40) for controlling the temperature of a fluid medium in the fluid container (10), the temperature control system (40) comprising a heating unit (41), a temperature sensing unit (42), and a processing unit; the heating unit (41) is embedded in the outer peripheral wall of the fluid container (10); the temperature sensing unit (42) is located in the cavity of the fluid container (10); the processing unit is connected to the heating unit (41) and the temperature sensing unit (42), and the processing unit is used to control the operation of the heating unit (41) according to temperature data detected by the temperature sensing unit (42); The outer peripheral wall of the fluid container (10) comprises a heat conduction layer located on the inner side, a protective layer located on the outer side, and a heat insulation layer located between the heat conduction layer and the protective layer, and the heating unit (41) is sandwiched between the heat conduction layer and the heat insulation layer; The sample holder (32) is located outside the circumference of the friction wheel (20), and the pressure driving member (31) is capable of pressurizing a piston sample (50) sandwiched between the friction wheel (20) and the sample holder (32), wherein the piston sample (50) is a lip portion of a concrete piston; The concrete piston wear resistance test method includes: Mounting the piston sample (50) on the sample holder (32); injecting a fluid medium into the fluid container (10) until the friction wheel (20) is submerged; Debug operating parameters; Starting the friction wheel (20) and the pressure driving member (31) so that the piston sample (50) is rubbed; After running for a preset test time, detecting the wear amount of the piston sample (50); The operating parameters include the force applied to the piston sample and the rotational speed of the friction wheel, wherein the force applied to the piston sample is the pressure applied by the pressure driving member (31) to the piston sample (50); The debugging operation parameters further include: Determine the force curve of the piston sample according to the pre-measured pumping pressure curve; Determine the friction wheel speed curve based on the pre-measured pumping frequency curve; Among them, the piston sample force curve is the proportion of the operating time of different piston sample force values ​​in the preset test time, the friction wheel speed curve is the proportion of the operating time of different friction wheel speed values ​​in the preset test time, the pumping pressure curve is the proportion of the operating time of different pumping pressure values ​​in the pumping time, and the pumping frequency curve is the proportion of the operating time of different pumping frequency values ​​in the pumping time.

2. The method for testing the wear resistance of concrete pistons according to claim 1, characterized in that: The temperature sensing unit (42) is arranged on the sample fixture (32).

3. The method for testing the wear resistance of concrete pistons according to claim 1, characterized in that: The concrete piston wear resistance testing device further comprises a stirring paddle (60) located in the cavity of the fluid container (10).

4. The method for testing the wear resistance of concrete pistons according to claim 3, characterized in that: The stirring paddle (60) and the friction wheel (20) are coaxially arranged.

5. The method for testing the wear resistance of concrete pistons according to any one of claims 1 to 4, characterized in that: The pressure driving member (31) is arranged along the radial direction of the friction wheel (20).

6. The method for testing the wear resistance of concrete pistons according to claim 1, characterized in that: The operating parameters also include the fluid medium temperature, and the concrete piston wear resistance test method also includes starting the temperature control system (40) after debugging the operating parameters.

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