Temperature-adjustable nylon tube friction wear testing machine and experimental method

Abstract

The invention relates to a temperature-adjustable nylon tube friction wear testing machine and an experiment method, and relates to the technical field of tube testing. The testing machine comprises a case, and a support plate and a temperature control device which are arranged in the case. An abrasion block and a clamping trolley are arranged on the supporting plate in a sliding mode, the abrasion block is driven by a driving piece to slide along the fixing frame, and the sliding direction of the clamping trolley is perpendicular to the abrasion block. A pair of clamping rods is hinged to the side, facing the abrasion block, of the clamping trolley, and an abutting piece is arranged on the side wall of the clamping trolley and used for abutting the clamping rods to clamp and fix the pipe when the clamping piece enables the clamping trolley and the abrasion block to be close to each other. Then, the abrasion block is driven by the driving piece to reciprocate between the clamping rods, and a friction test is carried out on the pipe. Through linkage cooperation of the clamping trolley, the hinged clamping rod and the abutting piece, rapid and reliable clamping of the pipe is achieved, a traditional bolt fastening mode is abandoned, installation errors are effectively reduced, and a basis is provided for high-precision and repeatable friction wear tests.

Description

Technical Field

[0001] This application relates to the field of pipe testing technology, and in particular to a temperature-adjustable nylon pipe friction and wear testing machine and test method. Background Technology

[0002] Friction and wear properties are a core indicator for evaluating the service life of nylon tubing in dynamic systems such as hydraulics and automobiles. In actual working conditions, the frictional behavior of nylon tubing is closely related to ambient temperature; therefore, simulating specific temperature conditions and conducting tests in the laboratory is crucial.

[0003] Currently, friction and wear tests on nylon tubing typically employ a general-purpose testing machine. The nylon tubing sample and its mating component are subjected to friction under a set load, and the degree of wear is assessed by measuring mass loss or surface morphology after the test. To account for temperature factors, existing methods often use external heating devices to heat the entire test area.

[0004] However, nylon tubing often needs to be bolted to clamps, and the installation and removal process requires the use of auxiliary tools such as screwdrivers, which is cumbersome, time-consuming, and prone to affecting the consistency and accuracy of the test due to uneven clamping force. This fixing method not only reduces experimental efficiency but also increases human error, further affecting the reliability and repeatability of friction and wear tests. Summary of the Invention

[0005] To facilitate the installation, fixing, and disassembly of nylon tubing during friction and wear testing, and to improve the reliability and repeatability of the friction and wear test, this application provides a temperature-adjustable nylon tubing friction and wear testing machine and experimental method.

[0006] In a first aspect, this application provides a temperature-adjustable nylon tube friction and wear testing machine, comprising a chassis, a support plate and a temperature control device disposed inside the chassis; a wear block slidably disposed on the support plate, the support plate being provided with a fixing frame for sliding the wear block, and a driving component for driving the wear block to slide on the fixing frame; a clamping trolley slidably disposed on the support plate, the sliding direction of the clamping trolley being perpendicular to the sliding direction of the wear block, a pair of clamping rods being hinged to the side of the clamping trolley facing the wear block, the lower end of the clamping rods being hinged to the clamping trolley, an abutment being disposed on the side wall of the clamping trolley, the abutment being used to abut the clamping rods to fix the tube to the side wall of the clamping trolley; and a clamping component disposed on the support plate for clamping the clamping trolley and the wear block, the wear block sliding between the pair of clamping rods and rubbing against the tube clamped on the clamping rods.

[0007] By adopting the above technical solution, when fixing the pipe in the clamping trolley, it is only necessary to place the pipe between a pair of clamping rods. As the clamping parts clamp the trolley and the wear block, the clamping rods clamp the pipe to the trolley, and at the same time, the driving abutment part pushes the clamping rods to clamp the pipe to the trolley again, thus completing a reliable fixation. This not only greatly improves experimental efficiency and reduces the use of auxiliary tools and manual operation time, but more importantly, the structured clamping method ensures that the position, posture, and clamping force are highly consistent each time. In this way, the cooperation of the clamping trolley, the hinged clamping rods, and the abutment part realizes the rapid clamping and locking of nylon pipes, abandoning the traditional bolt fastening method, reducing random errors introduced by differences in sample installation from the source, and laying a solid foundation for high-precision and high-repeatability measurements of friction coefficient, temperature, and wear.

[0008] Optionally, the clamping trolley is provided with fixing blocks at both ends. The fixing blocks are located on the opposite side of the pair of clamping rods. The fixing blocks have a sliding groove on the side wall facing the clamping rods for the abutment to slide. The fixing blocks are used to support the sliding of the abutment and abut against the side of the clamping rods opposite to the clamping trolley.

[0009] By adopting the above technical solution, the fixing block provides a stable and precise guide track (slide groove) for the abutment, so as to ensure the linear motion accuracy and stability of the abutment during the operation, and ensure that the force applied to the clamping rod is constant and without deviation. This improves the controllability of the clamping action and the accuracy of the clamping force, and avoids the pipe micro-movement or uneven stress distribution caused by the shaking or tilting of the clamping mechanism.

[0010] Optionally, the abutting member includes an abutting block, a threaded rod, and a gear; the abutting block is slidably disposed in the groove, and the abutting block slides along the extension direction of the hinge axis of the clamping rod; one end of the threaded rod is threadedly connected to the abutting block, and the other end is coaxially connected to the gear, the gear rotating in the fixed block, for driving the threaded rod to rotate and causing the abutting block to slide in and out of the groove.

[0011] By adopting the above technical solution, a combination of threaded transmission (threaded rod and abutment block) and gear drive is used to achieve precise and controllable mechanical drive for the clamping action. The rotating gear can precisely control the linear displacement of the abutment block, thereby enabling the quantification and fine-tuning of the swing angle of the clamping rod and the final clamping force. This quantifiable and reproducible clamping force control method completely changes the traditional rough mode of relying on manual feel to tighten bolts, allowing the clamping conditions of each test to be accurately repeated, greatly enhancing the comparability and repeatability of test data.

[0012] Optionally, a stop bar is fixed to the side of the fixing frame facing the clamping trolley. The end of the stop bar away from the clamping trolley has teeth. A slot is provided on the fixing block for the stop bar to be inserted. The gear rotates in the slot. The stop bar is inserted into the slot below the gear and meshes with the gear through the teeth. When the clamping trolley is close to the fixing frame, the insert bar into the slot drives the gear to rotate, which in turn drives the threaded rod to rotate. The threaded rod drives the abutment block to slide out of the groove and abut against the clamping rod to rotate toward the clamping trolley.

[0013] By adopting the above technical solution, the pipe clamping action is linked with the overall clamping process of the testing machine (the clamping trolley approaches the fixed frame). When the clamping trolley slides to the working position, the stop rod automatically inserts and meshes with the gear, converting linear motion into precise gear rotation, which in turn automatically drives the clamping mechanism to lock the pipe. This achieves fully automatic clamping in one step, completely eliminating human intervention in the clamping process. It is not only extremely simple and quick to operate, but also fundamentally eliminates the problem of inconsistent clamping states caused by differences in human operating force and sequence.

[0014] Optionally, the abutment is threadedly connected to the fixing frame, and the teeth on the abutment at the end away from the fixing frame are evenly distributed along the circumferential direction of the abutment.

[0015] By adopting the above technical solution, the extension length of the abutment rod can be finely adjusted. Furthermore, by rotating the abutment rod, its insertion depth into the slot can be finely adjusted, thereby indirectly and precisely controlling the initial engagement position of the gear and the final driven rotation angle. This adjustment function means that the final closed position of the clamping rod (i.e., the degree of clamping on the tube) can be preset and standardized. For nylon tube samples of different diameters or materials, the most suitable clamping position can be quickly set and locked through calibration, ensuring that all samples are tested under optimal and consistent constraint conditions. This significantly improves the adaptability of the testing machine to samples of different specifications and the standardization level of test results.

[0016] Optionally, the clamping trolley is rotatably connected to a pop-out rod on the side facing the fixing frame. The pop-out rod is located between the clamping rod and the clamping trolley, and is positioned close to the hinge axis of the clamping rod. The hinge axis of the pop-out rod is positioned close to the clamping rod at one end of the clamping trolley. The end of the pop-out rod near its own hinge axis extends into the fixing block and rotates within the fixing block. A spring is provided within the fixing block, with one end of the spring positioned on the pop-out rod. The spring is used to push the end of the pop-out rod located within the fixing block to rotate downwards, causing the end of the pop-out rod located outside the fixing block to rotate upwards, thereby popping the pipe out from between the clamping rods.

[0017] By employing the above technical solution, the combination of the ejector rod and the spring constitutes a built-in, automatic tube ejection mechanism. When the test ends and the clamping force is released (the spring disengages from the slot), the stored energy in the spring is automatically released, driving the ejector rod to gently push the tube out of the clamping position. This achieves rapid and non-destructive disassembly of the tube, avoiding secondary damage to the already worn sample surface that could be caused by manual prying or striking. For experimental methods requiring precise measurement of post-test mass loss (wear), protecting the original state of the sample after disassembly is crucial. This automatic ejection mechanism ensures consistency in each disassembly process and maximizes the integrity of the wear products, providing a reliable guarantee for subsequent high-precision offline mass measurement or microscopic morphology analysis.

[0018] Optionally, one end of the abutment extending into the fixing block not only meshes with the gear but also abuts against the bottom of the ejector rod. The end of the abutment extending into the fixing block is used to abut against the ejector rod to overcome the spring force and keep the ejector rod horizontal between the clamping rods.

[0019] By adopting the above technical solution, the abutment rod is endowed with a dual linkage function: firstly, it drives the gear to clamp the abutment block; secondly, it pushes down the ejector rod to make way for the clamping of the pipe. As the clamping trolley approaches the fixed frame, the abutment rod inserts and simultaneously compresses the spring, causing the ejector rod to descend to a horizontal, retracted state, thus providing unobstructed space for the pipe to be placed between the clamping rods. This ensures a smooth and automated clamping process. More importantly, throughout the entire test, the abutment rod continuously presses down on the ejector rod, completely eliminating any potential interference from the spring force on the clamping rods or the pipe. This ensures the clamping system is in an absolutely stable mechanical environment during friction testing, eliminating test noise introduced by minor internal movement, and creating ideal conditions for stable and accurate acquisition of friction coefficient and temperature signals.

[0020] Optionally, the clamping member includes a pull rope connected to the clamping trolley and a gravity block connected to the end of the pull rope away from the clamping trolley. The support plate has a through groove for the pull rope to pass through, and the gravity block is connected to the end of the pull rope that passes through the through groove.

[0021] By employing the above technical solution, a gravity block is used to provide clamping force via a rope, ensuring that the load applied to the sample contact surface is continuous and highly stable. Load stability is one of the fundamental elements for obtaining repeatable and reliable friction and wear data, providing a stable and traceable load environment for the entire friction and wear test.

[0022] Optionally, the driving component includes a motor mounted on the fixed frame, a turntable coaxially connected to the output shaft of the motor, and a crank rotatably connected to the turntable. The crank is eccentrically rotatably connected to the turntable. One end of the crank away from the turntable is connected to the wear block. A slider is rotatably connected to the other end of the crank away from the turntable. A limiting rod is provided on the fixed frame that slides through the slider. The wear block is fixed to the side of the slider away from the crank. The crank is used to drive the slider to slide back and forth along the length direction of the limiting rod, thereby driving the wear block to slide back and forth between a pair of clamping rods.

[0023] By adopting the above technical solution, the crank-slider converts the rotational motion of the motor into the precise linear reciprocating motion of the wear block. The limit rod provides strict guidance and constraint for the slider, ensuring that the movement trajectory of the wear block is a single, definite straight line, and the stroke is precisely determined by the eccentricity of the crank. This highly controllable, single-trajectory, periodically varying reciprocating motion can effectively simulate friction patterns under many actual working conditions, allowing the variation curve of the friction coefficient with time (or stroke) to be accurately recorded and analyzed. Combined with stable clamping and loading, this forms a testing platform capable of generating high-quality tribological data suitable for mechanistic research.

[0024] Secondly, this application provides a temperature-adjustable nylon tube friction and wear test method, which is applied to the temperature-adjustable nylon tube friction and wear testing machine described in the first aspect. The method includes: controlling the temperature inside the machine chamber based on the temperature control device; driving the clamping carriage away from the fixed frame and placing the tube between the clamping rod and the clamping carriage; driving the clamping member to clamp the clamping carriage and the wear block, while the clamping rod clamps the tube to the side wall of the clamping carriage, and the abutting member abuts the clamping rod to fix the tube to the side wall of the clamping carriage; driving the driving member to drive the wear block to rub back and forth against the tube fixed on the fixed frame to perform a wear test, and obtaining the test results.

[0025] Since a temperature-adjustable nylon tube friction and wear test method has the same technical effect as the temperature-adjustable nylon tube friction and wear test machine provided in the first aspect above, the relevant description in the first aspect above can be referred to, and will not be repeated here.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. By linking the clamping carriage, the hinged clamping rod, and the abutment, the nylon tube sample can be quickly and non-destructively clamped and disassembled, completely eliminating the traditional bolt fastening method and auxiliary tools. This not only greatly improves experimental efficiency, but more importantly, the mechanical structure ensures that the position, posture, and clamping force are highly consistent each time, reducing human error and randomness in installation from the source. This lays a solid foundation for high-precision and high-repeatability measurement of friction coefficient, temperature, and wear. 2. Through the automatic meshing transmission design of the abutment rod and gear, the pipe clamping action is intelligently linked with the mold closing process of the testing machine, realizing one-step fully automatic standardized clamping, completely eliminating the difference of human intervention in the clamping process, and the clamping degree can be preset and calibrated by adjusting the abutment rod, ensuring that samples of different specifications are tested under optimal and consistent constraint conditions, which greatly enhances the comparability, repeatability and standardization of test data. 3. By combining constant gravity loading with precise crank-slider guidance, a continuous, stable, and precisely controllable mechanical and kinematic environment is provided for friction testing. The constant load avoids pressure fluctuations, and the precise linear reciprocating motion simulates real working conditions. Together, these two methods ensure the stability of the friction interface state throughout the testing process, thus providing an effective guarantee for obtaining real, reliable, and in-depth dynamic data on friction and wear that can be used for in-depth mechanistic research. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the testing machine provided in the embodiments of this application.

[0028] Figure 2 This is a schematic diagram of the internal structure of the testing machine provided in an embodiment of this application.

[0029] Figure 3 This is a schematic diagram illustrating the structure of the abutment component, provided for an embodiment of this application.

[0030] Explanation of reference numerals in the attached drawings: 1. Chassis; 11. Support plate; 12. Door; 13. Guide rail; 2. Wear block; 21. Fixing frame; 211. Limiting rod; 22. Driving component; 221. Motor; 222. Turntable; 223. Crank; 224. Slider; 23. Abutment rod; 3. Clamping trolley; 31. Clamping rod; 311. Hinge seat; 32. Abutment component; 321. Abutment block; 322. Threaded rod; 323. Gear; 33. Fixing block; 331. Slot; 34. Pop-out rod; 341. Spring; 4. Clamping component; 41. Pull rope; 42. Gravity block; 43. Guide wheel. Detailed Implementation

[0031] This application discloses a temperature-adjustable nylon tube friction and wear testing machine. (Refer to...) Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the overall structure of the testing machine provided in the embodiments of this application. Figure 2 This is a schematic diagram of the internal structure of the testing machine provided in an embodiment of this application. The testing machine includes a chassis 1, a wear block 2, a clamping carriage 3, and a clamping component 4. The chassis 1 is equipped with a support plate 11 and a temperature control device; the wear block 2 is slidably mounted on the support plate 11, and the support plate 11 is equipped with a fixing frame 21 for the wear block 2 to slide, and the fixing frame 21 is equipped with a driving component 22 for driving the wear block 2 to slide; the clamping trolley 3 is slidably mounted on the support plate 11, and the sliding direction of the clamping trolley 3 is perpendicular to the sliding direction of the wear block 2. A pair of clamping rods 31 are hinged to the side of the clamping trolley 3 facing the wear block 2, and the lower end of the clamping rods 31 is hinged to the clamping trolley 3. An abutment 32 is provided on the side wall of the clamping trolley 3, and the abutment 32 is used to abut the clamping rods 31 to fix the pipe to the side wall of the clamping trolley 3; the clamping component 4 is provided on the support plate 11 to clamp the clamping trolley 3 and the wear block 2. The wear block 2 slides between the pair of clamping rods 31 and rubs against the pipe clamped on the clamping rods 31.

[0032] In this embodiment, a door 12 is hinged to the chassis 1, and the door 12 contains a test chamber to seal the test chamber for heating by a temperature control device. A fixed frame 21 is fixed to a support plate 11, and a clamping trolley 3 slides horizontally to move closer to or away from the fixed frame 21, facilitating friction and wear testing of the tubing on the clamping trolley 3 by the wear block 2. A pair of guide rails 13 are provided on the support plate 11, and the clamping trolley 3 slides between the guide rails 13 to limit the rollers of the clamping trolley 3, ensuring that the clamping trolley 3 maintains the same path and direction of travel each time it approaches or moves away from the fixed frame 21. The hinge axis of the clamping rod 31 extends perpendicularly to the travel direction of the clamping carriage 3. This allows the nylon tubing to be placed between the clamping rod 31 and the clamping carriage 3. The clamping member 4 then rotates the clamping rod 31 towards the side wall of the clamping carriage 3 under the abutment of the fixing frame 21. Simultaneously, the abutment member 32 further abuts the clamping rod 31, securing the tubing to the clamping carriage 3. If the clamping carriage 3 is manually detached from the fixing frame 21, the clamping rod 31 loses the clamping force of the clamping member 4 and the abutment of the abutment member 32, causing the clamping rod 31 to rotate away from the clamping carriage 3, thus releasing the tubing from the friction and wear test.

[0033] It should be noted that a hinge seat 311 is fixed on the side wall of the clamping trolley 3 at the position where it is hinged to the clamping rod 31. The lower end of the clamping rod 31 rotates within the hinge seat 311. The hinge seat 311 is used to limit the range of rotation of the clamping rod 31 in the direction away from the clamping trolley 3, so that the clamping rod 31 maintains a certain angle with the side wall of the clamping trolley 3 after it is not abutted, and is in an upward tilted state.

[0034] For example, the temperature control device may integrate a high-precision heating module (such as a heating wire, PTC heating element, or infrared radiation heater) and a semiconductor cooling module below the support plate 11 or around the test chamber, in conjunction with a circulating air duct or liquid cooling circuit, to achieve rapid and stable adjustment of the test area within the range of room temperature to 150°C. A temperature sensor (such as a platinum resistance thermometer or thermocouple) is directly embedded near the end of the wear block 2 or in the tubular support area of ​​the clamping trolley 3, collecting temperature data of the area adjacent to the friction interface in real time and feeding it back to the temperature control system to form a closed-loop control. The temperature control device may further include a heat insulation layer and a heat spreader to ensure the uniformity and stability of the temperature field, thereby accurately simulating different operating conditions and providing in-situ, real-time data support for the study of temperature effects during the friction and wear process.

[0035] In some embodiments, the clamping trolley 3 is provided with fixing blocks 33 at both ends. The fixing blocks 33 are located on the opposite side of a pair of clamping rods 31. The fixing blocks 33 have a sliding groove on the side wall facing the clamping rods 31 for the abutment 32 to slide. The fixing blocks 33 are used to support the sliding of the abutment 32 and abut against the side of the clamping rods 31 opposite to the clamping trolley 3.

[0036] In this embodiment, the fixing block 33 is disposed near the clamping rod 31 and fixed on the side wall of the clamping trolley 3 facing the fixing frame 21. The sliding groove is located on the side wall of the fixing block 33 facing the clamping rod 31. In this embodiment, the sliding groove is not shown. The function of the sliding groove is to restrict the rotation of the abutment 32 and allow the abutment 32 to slide.

[0037] In some embodiments, see Figure 2 and Figure 3 , Figure 3 This is a schematic diagram illustrating the structure of the abutment member provided in an embodiment of this application. The abutment member 32 includes an abutment block 321, a threaded rod 322, and a gear 323. The abutment block 321 is slidably disposed in a groove and slides along the extension direction of the hinge axis of the clamping rod 31. One end of the threaded rod 322 is threadedly connected to the abutment block 321, and the other end is coaxially connected to the gear 323. The gear 323 rotates within a fixed block 33 and is used to drive the threaded rod 322 to rotate, thereby causing the abutment block 321 to slide in and out of the groove.

[0038] In this embodiment, the end of the abutment block 321 away from the threaded rod 322 has a wedge-shaped surface, so that it abuts against the side wall of the clamping rod 31 away from the clamping trolley 3 through the wedge-shaped surface. During the sliding out process of the abutment block 321, the wedge-shaped surface abuts against the clamping rod 31 and rotates towards the clamping trolley 3 to clamp the pipe. The abutment block 321 always slides in the groove so that the forward and reverse rotation of the threaded rod 322 can drive the abutment block 321 to slide. The gear 323 rotates in the fixed block 33 and is connected to the inner wall of the fixed block 33 through the rotating shaft, so that the rotation of the gear 323 drives the threaded rod 322 to rotate, and then the rotation of the threaded rod 322 drives the abutment block 321 to slide into and out of the fixed block 33.

[0039] In some embodiments, see Figure 2 and Figure 3 A stop rod 23 is fixed on the side of the fixed frame 21 facing the clamping trolley 3. The end of the stop rod 23 away from the clamping trolley 3 has teeth. A slot 331 for inserting the stop rod 23 is provided on the fixed block 33. The gear 323 rotates in the slot 331. The stop rod 23 is inserted into the slot 331 and is located below the gear 323. It meshes with the gear 323 through the teeth. When the clamping trolley 3 is close to the fixed frame 21, the stop rod 23 inserts into the slot 331 and drives the gear 323 to rotate, which in turn drives the threaded rod 322 to rotate. The threaded rod 322 drives the abutment block 321 to slide out of the groove and abuts the clamping rod 31 to rotate toward the clamping trolley 3.

[0040] In this embodiment, the abutment 23 is located on the fixed frame 21. The clamping trolley 3 is limited by the guide rail 13, so that each time it approaches the fixed frame 21, the abutment 23 on the fixed frame 21 can be inserted into the slot 331 and engaged with the lower end of the gear 323. This allows the abutment 23 to drive the gear 323 to rotate when the clamping trolley 3 approaches the fixed frame 21, thus driving the threaded rod 322 to rotate. The threaded rod 322 then drives the abutment block 321 to slide. When the clamping trolley 3 moves away from the fixed frame 21, the abutment 23 disengages from the fixed block 33, causing the gear 323 to reverse. The gear 323 then drives the threaded rod 322 to reverse, causing the threaded rod 322 to slide the abutment block 321 into the fixed block 33, releasing the abutment on the clamping rod 31.

[0041] It should be noted that the teeth on the abutment 23 are not located at the end of the abutment 23 that is inserted into the slot 331. That is to say, the teeth of the abutment 23 will only mesh with the gear 323 after the end of the abutment 23 is inserted into the slot 331 and passes through the gear 323.

[0042] In some embodiments, the abutment 23 is threadedly connected to the fixing frame 21, and the teeth of the abutment 23 at the end away from the fixing frame 21 are evenly distributed along the circumferential direction of the abutment 23.

[0043] In this embodiment, the threaded connection depth of the abutment 23 and the fixing frame 21 is adjusted so as to manually rotate the abutment 23 and the depth of the abutment 23 into the slot 331. This changes the length of the teeth on the abutment 23 that mesh with the gear 323, thereby changing the number of rotations of the gear 323, changing the distance the abutment block 321 slides off the fixing block 33, thereby changing the degree of contact between the abutment block 321 and the clamping rod 31, and changing the angle at which the clamping rod 31 rotates toward the side wall of the clamping trolley 3.

[0044] In some embodiments, see Figure 1 and Figure 3 A ejector rod 34 is rotatably connected to the side of the clamping trolley 3 facing the fixed frame 21. The ejector rod 34 is located between the clamping rod 31 and the clamping trolley 3, and the ejector rod 34 is set close to the hinge axis of the clamping rod 31. The hinge axis of the ejector rod 34 is set close to the clamping rod 31 at one end of the clamping trolley 3. The end of the ejector rod 34 close to its own hinge axis extends into the fixed block 33 and rotates within the fixed block 33. A spring 341 is set inside the fixed block 33. One end of the spring 341 is set on the ejector rod 34. The spring 341 is used to push the end of the ejector rod 34 located inside the fixed block 33 to rotate downward, causing the end of the ejector rod 34 located outside the fixed block 33 to rotate upward, so as to eject the pipe from between the clamping rods 31.

[0045] In this embodiment, the ejector rod 34 rotates close to the side wall of the clamping trolley 3 towards the fixing frame 21, and the hinge axis of the ejector rod 34 is located on the side wall of the clamping trolley 3 near one of the clamping rods 31. This clamping rod 31 is located near the door 12, so that the ejector rod 34 can lift the tube for the test personnel to open the door 12 and take out the tube. One end of the spring 341 is fixed to the top wall of the cavity of the fixing block 33, and the other end is fixed to the upper surface of the end of the ejector rod 34 that extends into the fixing block 33. When the ejector rod 34 is not abutted by the abutment rod 23, the spring 341 abuts the end of the ejector rod 34 located inside the housing 1 and lifts it up, so that the test personnel can take out the tube.

[0046] It should be noted that the thickness of the ejector rod 34 is much thinner than that of the tube.

[0047] In some embodiments, one end of the abutment rod 23 extending into the fixing block 33 not only meshes with the gear 323 but also abuts against the bottom of the ejector rod 34. The end of the abutment rod 23 extending into the fixing block 33 is used to abut the ejector rod 34 to overcome the elastic force of the spring 341 and keep the ejector rod 34 horizontal between the clamping rods 31.

[0048] In this embodiment, when the abutment rod 23 extends into the fixing block 33 and meshes with the gear 323 and abuts against the ejector rod 34, the ejector rod 34 is located on the hinge axis of the clamping rod 31 and remains horizontal, so that the pipe remains horizontal after the clamping rod 31 clamps the pipe.

[0049] In some embodiments, continue reading Figure 1 and Figure 3 The clamping component 4 includes a pull rope 41 connected to the clamping trolley 3 and a gravity block 42 connected to the end of the pull rope 41 away from the clamping trolley 3. The support plate 11 has a through groove for the pull rope 41 to pass through, and the gravity block 42 is connected to the end of the pull rope 41 that passes through the through groove.

[0050] In this embodiment, the end of the pull rope 41 away from the gravity block 42 is fixed to the lower part of the ejector rod 34 on the side wall of the clamping trolley 3, and the pull rope 41 is fixed to the center line of the clamping trolley 3. A guide wheel 43 is fixed on the groove wall of the through groove. The pull rope 41 passes through the through groove through the guide wheel 43 and is fixed to the gravity block 42, which helps to pull the clamping trolley 3 closer to the fixed frame 21 under the gravity of the gravity block 42.

[0051] In some embodiments, see Figure 2 and Figure 3 The driving component 22 includes a motor 221 mounted on a fixed frame 21, a turntable 222 coaxially connected to the output shaft of the motor 221, and a crank 223 rotatably connected to the turntable 222. The crank 223 is eccentrically rotatably connected to the turntable 222. The end of the crank 223 away from the turntable 222 is connected to the wear block 2. The end of the crank 223 away from the turntable 222 is rotatably connected to a slider 224. A limiting rod 211 is provided on the fixed frame 21, which slides through the slider 224. The wear block 2 is fixed to the side of the slider 224 away from the crank 223. The crank 223 is used to drive the slider 224 to slide back and forth along the length direction of the limiting rod 211, thereby driving the wear block 2 to slide back and forth between a pair of clamping rods 31.

[0052] In this embodiment, the motor 221 is fixed to the side of the fixed frame 21 away from the clamping trolley 3, and the output shaft of the motor 221 passes through the fixed frame 21 and is coaxially connected to the turntable 222. The crank 223 is rotatably connected to the side of the turntable 222 away from the motor 221. Driven by the motor 221, the turntable 222 is rotated, and the turntable 222 drives the crank 223 to swing. During the swing of the crank 223, the slider 224 is limited by the limiting rod 211, so that the slider 224 slides on the limiting rod 211, thereby driving the wear block 2 to slide, and realizing the friction and wear test on the pipe clamped by the clamping rod 31.

[0053] Based on the above-mentioned temperature-adjustable nylon tube friction and wear testing machine, this application embodiment also provides a temperature-adjustable nylon tube friction and wear testing method corresponding to the testing machine, the method including steps S100~S400: S100: Temperature inside the chassis is controlled by a temperature control device.

[0054] In this embodiment, before the test begins, the target ambient temperature of the test chamber inside the chassis is set and maintained by a temperature control device. The temperature control device performs closed-loop adjustment based on real-time feedback from a high-precision temperature sensor integrated into the proximal end of the wear block or the clamping area, so that the ambient temperature quickly reaches and stabilizes at a preset value (such as a specific temperature within the range of -20℃ to 150℃) to accurately simulate the actual working temperature of the nylon tubing.

[0055] S200, drive the clamping trolley away from the fixed frame and place the pipe between the clamping rod and the clamping trolley.

[0056] In this embodiment, the tester moves the clamping trolley, sliding it along the support plate away from the fixing frame and wear block, until it reaches a convenient sample loading position. At this point, the clamping rods are in a naturally open state under their own weight. The nylon tube to be tested is placed horizontally, with its body positioned between a pair of clamping rods and initially resting against the side wall of the clamping trolley, completing the initial placement and positioning of the sample.

[0057] S300, the clamping member is driven to clamp the clamping carriage and the wear block. At the same time, the clamping rod clamps the pipe to the side wall of the clamping carriage, and the abutment member abuts the clamping rod to fix the pipe to the side wall of the clamping carriage.

[0058] In this embodiment, the clamping element is released or driven (e.g., the pull rope connecting the gravity block is released), allowing the clamping trolley to move smoothly towards the fixed frame under a constant load until it is tightly closed with the fixed frame. During this mold closing process, the abutment rod fixed to the fixed frame is simultaneously inserted into the slot of the clamping trolley's fixing block. The insertion of the abutment rod generates two key linkage actions: first, the teeth at the front end of the abutment rod mesh with the gear in the slot, driving the gear to rotate, which in turn drives the threaded rod to rotate, causing the abutment block to slide precisely out of the groove and push the clamping rod to rotate inward around the hinge point, thereby firmly and centrally clamping the nylon tube to the side wall of the clamping trolley; second, the end of the abutment rod simultaneously presses down the ejector rod in the fixing block, keeping it in a horizontal retracted state, creating conditions for stable clamping. This step realizes the automated linkage of clamping, positioning, and locking.

[0059] S400: Drive the drive component to move the wear block back and forth against the pipe fixed on the fixed frame to carry out the wear test and obtain the test results.

[0060] In this embodiment, the driving component (such as a motor) is activated, which drives the turntable and crank to rotate. The crank-slider mechanism converts the rotational motion into precise linear reciprocating motion of the wear block along the direction of the limiting rod. The wear block then slides back and forth between a pair of clamping rods, maintaining continuous and stable frictional contact with the outer surface of the firmly clamped nylon tube. Throughout the test, the temperature control device continuously operates to maintain the set temperature, while simultaneously recording parameters such as the coefficient of friction, the number of reciprocations, and temperature changes. After the set test cycle or number of reciprocations, the driving component and temperature control device are stopped, thus completing one friction and wear test. Subsequently, operations such as wear block reset, clamping force release, and sample removal can be performed, and mass loss measurement or surface morphology analysis of the tube can be conducted to obtain the final wear performance data.

[0061] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A temperature-adjustable nylon tube friction and wear testing machine, characterized in that, include: The chassis contains a support plate and a temperature control device; A wear block is slidably disposed on the support plate, and the support plate is provided with a fixing frame for the wear block to slide, and the fixing frame is provided with a driving component for driving the wear block to slide; A clamping trolley is slidably mounted on the support plate. The sliding direction of the clamping trolley is perpendicular to the sliding direction of the wear block. A pair of clamping rods are hinged to the side of the clamping trolley facing the wear block. The lower ends of the clamping rods are hinged to the clamping trolley. An abutment is provided on the side wall of the clamping trolley. The abutment is used to abut the clamping rods to fix the pipe to the side wall of the clamping trolley. A clamping element, disposed on the support plate, is used to clamp the clamping trolley and the wear block, wherein the wear block slides between a pair of clamping rods and rubs against the pipe clamped on the clamping rods.

2. The testing machine according to claim 1, characterized in that, The clamping trolley has fixing blocks at both ends. The fixing blocks are located on the opposite side of the pair of clamping rods. The fixing blocks have a sliding groove on the side wall facing the clamping rods for the abutment to slide. The fixing blocks are used to support the sliding of the abutment and abut against the side of the clamping rods opposite to the clamping trolley.

3. The testing machine according to claim 2, characterized in that, The abutting component includes an abutting block, a threaded rod, and a gear; the abutting block is slidably disposed in the groove, and the abutting block slides along the extension direction of the hinge axis of the clamping rod; one end of the threaded rod is threadedly connected to the abutting block, and the other end is coaxially connected to the gear, the gear rotates in the fixed block, and is used to drive the threaded rod to rotate and drive the abutting block to slide in and out of the groove.

4. The testing machine according to claim 3, characterized in that, A stop bar is fixed to the side of the fixing frame facing the clamping trolley. The end of the stop bar away from the clamping trolley has teeth. A slot is provided on the fixing block for the stop bar to be inserted. The gear rotates in the slot. The stop bar is inserted into the slot below the gear and meshes with the gear through the teeth. When the clamping trolley is close to the fixing frame, the insert bar into the slot drives the gear to rotate, which in turn drives the threaded rod to rotate. The threaded rod drives the abutment block to slide out of the groove and abut against the clamping rod to rotate toward the clamping trolley.

5. The testing machine according to claim 4, characterized in that, The abutment is threadedly connected to the fixing frame, and the teeth on the abutment at the end away from the fixing frame are evenly distributed along the circumferential direction of the abutment.

6. The testing machine according to claim 4, characterized in that, The clamping trolley is rotatably connected to a pop-out rod on the side facing the fixing frame. The pop-out rod is located between the clamping rod and the clamping trolley, and is positioned close to the hinge axis of the clamping rod. The hinge axis of the pop-out rod is positioned close to the clamping rod at one end of the clamping trolley. The end of the pop-out rod close to its own hinge axis extends into the fixing block and rotates within the fixing block. A spring is provided inside the fixing block, with one end of the spring positioned on the pop-out rod. The spring is used to push the end of the pop-out rod inside the fixing block to rotate downwards, causing the end of the pop-out rod outside the fixing block to rotate upwards, so as to pop the pipe out from between the clamping rods.

7. The testing machine according to claim 6, characterized in that, One end of the abutment rod extending into the fixing block not only meshes with the gear but also abuts against the bottom of the ejector rod. The end of the abutment rod extending into the fixing block is used to push the ejector rod against the spring force and keep the ejector rod horizontal between the clamping rods.

8. The testing machine according to claim 1, characterized in that, The clamping component includes a pull rope connected to the clamping trolley and a gravity block connected to the end of the pull rope away from the clamping trolley. The support plate has a through groove for the pull rope to pass through, and the gravity block is connected to the end of the pull rope that passes through the through groove.

9. The testing machine according to claim 1, characterized in that, The driving component includes a motor mounted on the fixed frame, a turntable coaxially connected to the output shaft of the motor, and a crank rotatably connected to the turntable. The crank is eccentrically rotatably connected to the turntable. The end of the crank away from the turntable is connected to the wear block. A slider is rotatably connected to the end of the crank away from the turntable. A limiting rod is provided on the fixed frame that slides through the slider. The wear block is fixed to the side of the slider away from the crank. The crank is used to drive the slider to slide back and forth along the length direction of the limiting rod, thereby driving the wear block to slide back and forth between a pair of clamping rods.

10. A temperature-adjustable nylon tube friction and wear test method, characterized in that, The method applied to the temperature-adjustable nylon tube friction and wear testing machine according to claim 1 includes: The temperature inside the chassis is controlled based on the temperature control device; Drive the clamping trolley away from the fixed frame and place the tube between the clamping rod and the clamping trolley; The clamping member is driven to clamp the clamping trolley and the wear block. At the same time, the clamping rod clamps the pipe to the side wall of the clamping trolley, and the abutting member abuts the clamping rod to fix the pipe to the side wall of the clamping trolley. The drive component is driven to cause the wear block to rub back and forth against the pipe fixed on the fixed frame to conduct a wear test and obtain the test results.

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