A device for testing the anti-seizure performance of materials

Abstract

The present invention relates to a device for testing the anti-seizure performance of materials, comprising a test platform and a pressure-bearing platform, wherein a clamping assembly is provided on the pressure-bearing platform, a driving assembly is provided on the test platform, a speed torque sensor is provided on the driving assembly, a hydraulic loading assembly is connected to the clamping assembly, and an electro-hydraulic proportional overflow valve is connected to the hydraulic loading assembly; the advantages of the present invention are as follows: the grinding specimen is fixed on the pressure-bearing platform by the clamping assembly, and then a load is applied to the clamping assembly by the hydraulic loading assembly, the electro-hydraulic proportional overflow valve realizes stepless pressure regulation of the hydraulic loading assembly, and different test loads can be applied to materials with different anti-seizure performance, while the pressure is stable and the applied load can be accurately maintained, a uniform and stable speed is provided to the grinding specimen by the driving assembly, and the rotational torque during the test is recorded in real time by the speed torque sensor, providing more comprehensive analysis data for the test results, and the test accuracy is improved from 55% to 98% compared with non-dedicated pressure equipment.

Description

Technical Field

[0001] The invention relates to a device for testing the anti-seizure performance of materials. Background Art

[0002] Material seizure refers to a failure caused by the adhesion of two solid surfaces during sliding due to factors such as high speed and heavy load. Seizure occurs in many situations, particularly in threaded connections, where excessive preload, the presence of excess material, and other factors can easily cause seizure between mating threads. Once seizure occurs, the parts cannot be disassembled, and even forcible disassembly can damage the parts, rendering them unusable. Therefore, material seizure resistance is a critical property, and scientific evaluation of the seizure resistance of selected materials is necessary in situations prone to seizure. Currently, the widely used methods for evaluating material seizure resistance are the American Society for Testing and Materials (ASTM) standards 98 and G196. These standards specify the specimen dimensions and test methods for seizure testing, and require the use of a device capable of providing constant pressure. However, in actual testing, the use of arbitrary constant-pressure testing machines presents numerous challenges.

[0003] First, some pressure testing machines control pressure by displacement, and very small displacement changes will cause large changes in the applied load, making the load application difficult to control and very inaccurate. Second, the test method requires that the two sample planes be rotated relative to each other at a fixed angle while applying pressure between the two samples. Since ordinary presses do not have the function of clamping and rotating the samples, the two pressure planes directly apply a large load to the samples. If the samples are not placed flat, they are prone to tipping over, posing a safety hazard. At the same time, the torque of the sample needs to be applied manually through a wrench. In the process of manually rotating the sample, there are the following problems: (1) It cannot be guaranteed that each The angular velocity of the rotation of the specimens is consistent. The relative angular velocity of the specimens is one of the important factors affecting the seizure. Failure to maintain consistency will affect the test results; (2) The manually applied torque is difficult to maintain on a horizontal plane and is prone to offset during the rotation process, affecting the accuracy of the test results; (3) The magnitude of the applied torque cannot be recorded in real time. The torque will increase instantly when the material is seizure. Real-time recording of the torque can accurately judge the application of the specimen seizure; (4) The maximum value of the manually applied torque is limited. When the material is seizure, the rotational torque will increase a lot, and manual force cannot maintain the specimen to continue rotating until it reaches a fixed angle. Summary of the Invention

[0004] The object to be achieved by the present invention is to provide a device for testing the anti-seizure performance of materials, which can not only adapt to the anti-seizure performance tests of different materials, but also improve the accuracy of the anti-seizure performance tests of materials.

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions: a device for testing the anti-seizure performance of materials, comprising a test platform and a pressure-bearing platform arranged on the test platform, the pressure-bearing platform is provided with a clamping assembly for clamping the grinding specimen, the test platform is provided with a driving assembly connected to the clamping assembly, the driving assembly is provided with a speed torque sensor for collecting the rotational torque during the test process, the clamping assembly is connected to a hydraulic loading assembly for applying a load to the clamping assembly, and the hydraulic loading assembly is connected to an electro-hydraulic proportional overflow valve for realizing stepless pressure regulation of the hydraulic loading assembly.

[0006] Preferably, the clamping assembly includes a lower fixed plate, an upper fixed plate and a positioning pin, the lower fixed plate is fixedly connected to the pressure platform through a bearing, the upper fixed plate is fixed to the hydraulic loading assembly through a bolt assembly, the grinding sample is installed on the pressure platform through the lower fixed plate and the upper fixed plate, a steel ball is provided between the upper fixed plate and the sample, and the positioning pin is arranged between the grinding samples.

[0007] Preferably, the pressure-bearing platform includes a vertical rod and a horizontal plate, the horizontal plate is arranged on the vertical rod, and the bottom end of the vertical rod is fixedly connected to the test platform.

[0008] Preferably, a horizontal groove is provided on the test platform, and a flange extending outward is provided on the vertical rod, and the flange is fixedly connected to the horizontal groove by screws.

[0009] Preferably, the test platform is provided with a shell for installing the hydraulic loading component, a reinforcing plate is provided inside the shell, and reinforcing ribs are provided on the reinforcing plate.

[0010] Preferably, the hydraulic loading assembly includes a hydraulic pump, a hydraulic motor, an oil filter, an oil tank, a one-way valve, a pressure gauge, a two-position four-way solenoid reversing valve and a hydraulic cylinder. The hydraulic motor is connected to the hydraulic pump. The hydraulic pump includes an oil inlet and an oil outlet. The oil inlet is connected to the oil tank through an oil filter. The oil outlet is connected to an oil outlet pipe. The oil outlet pipe includes a first pipeline connected to the pressure gauge, a second pipeline connected to the electro-hydraulic proportional overflow valve, and a third pipeline connected to the four-way solenoid reversing valve. The one-way valve is arranged on the third pipeline and is located between the four-way solenoid reversing valve and the hydraulic pump.

[0011] Preferably, the two-position four-way electromagnetic reversing valve is connected to an accumulator to ensure the hydraulic stability of the pipeline.

[0012] Preferably, a stop valve is provided on the first pipeline to facilitate the disassembly and assembly of the pressure gauge.

[0013] Preferably, the hydraulic loading assembly also includes a box body fixedly connected to the outer shell, and the hydraulic pump, hydraulic motor, oil filter, oil tank, one-way valve, pressure gauge, and two-position four-way solenoid reversing valve are all arranged in the box body. A fixing mechanism of the hydraulic cylinder is fixed on the outer wall of the box body, and the fixing mechanism includes a fixing plate and a supporting rib plate. The supporting rib plate includes a horizontal part and a vertical part. The horizontal part is arranged at the top end of the vertical part, and the horizontal part is fixedly connected to the box body, and the fixing plate is fixedly connected to the horizontal part.

[0014] Preferably, the drive assembly includes a motor, a worm gear reducer and a transmission shaft, the worm gear reducer includes an output end and an input end, the motor is connected to the input end, the output end is connected to the transmission shaft, and the speed torque sensor is arranged between the output end and the transmission shaft.

[0015] In summary, the advantages of the present invention are as follows: the grinding specimen is fixed on the pressure platform by the clamping assembly, and then the load is applied to the clamping assembly by the hydraulic loading assembly. During the load application process, it is possible to detect whether the grinding specimen is shaking or tilting, thereby ensuring its stability. Since the hydraulic loading assembly is connected to the electro-hydraulic proportional relief valve, the hydraulic loading assembly can achieve stepless pressure regulation, and can apply different test loads to materials with different anti-seizure properties. At the same time, the pressure is stable and the applied load can be accurately maintained. The driving assembly provides a uniform and stable speed to the grinding specimen, eliminating the result error caused by different test speeds, and the test results are more accurate. The speed and torque sensor records the rotational torque during the test in real time, providing more comprehensive analysis data for the test results. In addition, during the test, the grinding specimen is clamped and fixed by the clamping assembly, effectively avoiding the risk of the specimen tipping over during the test, making it safer and more reliable. The test accuracy is increased from 55% to 98% compared to non-dedicated pressure equipment. Finally, the driving assembly and the pressure platform are uniformly installed on the test platform, which can optimize the structure of the entire device and make the test platform more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings:

[0017] Figure 1 This is a schematic structural diagram of a device for testing the anti-seizure performance of materials according to the present invention;

[0018] Figure 2 This is a schematic structural diagram of the clamping assembly on the pressure platform in the present invention;

[0019] Figure 3 Schematic diagram of the structure of the clamping assembly in the present invention;

[0020] Figure 4 Schematic diagram of the structure of the hydraulic loading assembly of the present invention;

[0021] Figure 5 This is a schematic diagram of the structure of the hydraulic cylinder on the box body in the present invention;

[0022] Figure 6 Schematic diagram of the structure of the drive assembly in the present invention;

[0023] Figure 7 This is a structural schematic diagram of the pressure-bearing platform of the present invention installed on the test platform;

[0024] Figure 8 It is a structural schematic diagram of the shell in the present invention.

[0025] Reference numerals:

[0026] 1 Test platform, 11 horizontal groove, 12 shell, 13 reinforcement plate, 14 reinforcement rib, 2 pressure platform, 21 vertical rod, 22 horizontal plate, 23 flange, 24 screw, 3 clamping assembly, 31 lower fixed plate, 32 upper fixed plate, 33 positioning pin, 34 bearing, 35 bolt assembly, 36 steel ball, 4 drive assembly, 40 speed torque sensor, 41 motor, 42 worm gear reducer, 43 transmission shaft, 5 hydraulic loading assembly, 50 hydraulic pump, 51 hydraulic motor, 52 oil filter, 53 oil tank, 54 one-way valve, 55 pressure gauge, 56 two-position four-way solenoid reversing valve, 57 hydraulic cylinder, 58 accumulator, 59 stop valve, 6 electro-hydraulic proportional relief valve, 7 oil outlet pipe, 71 first pipeline, 72 second pipeline, 73 third pipeline, 8 box, 81 fixing mechanism, 82 fixing plate, 83 supporting rib, 84 horizontal part, 85 vertical part, 9 grinding specimen. DETAILED DESCRIPTION

[0027] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8 As shown, a device for testing the anti-seizure performance of materials includes a test platform 1 and a pressure platform 2 arranged on the test platform 1, the pressure platform 2 is provided with a clamping assembly 3 for clamping a grinding specimen 9, the test platform 1 is provided with a driving assembly 4 connected to the clamping assembly 3, the driving assembly 4 is provided with a speed torque sensor 40 for collecting the rotational torque during the test, the clamping assembly 3 is connected to a hydraulic loading assembly 5 for applying a load to the clamping assembly 3, and the hydraulic loading assembly 5 is connected to an electro-hydraulic proportional overflow valve 6 for realizing stepless pressure regulation of the hydraulic loading assembly 5.

[0028] The grinding specimen 9 is fixed to the pressure platform 2 by the clamping assembly 3, and then the load is applied to the clamping assembly 3 by the hydraulic loading assembly 5. During the load application process, the grinding specimen 9 can be detected for shaking or tilting, thereby ensuring its stability. Since the hydraulic loading assembly 5 is connected to the electro-hydraulic proportional relief valve 6, the hydraulic loading assembly 5 can achieve stepless pressure regulation, and can apply different test loads to materials with different anti-seizure properties. At the same time, the pressure is stable and the applied load can be accurately maintained. The driving assembly 4 provides a uniform and stable rotation speed to the grinding specimen 9, eliminating the result errors caused by different test speeds, and the test results are more accurate. The rotational torque during the test is recorded in real time by the speed torque sensor 40, providing more comprehensive analytical data for the test results. In addition, during the test, the grinding specimen 9 is clamped and fixed by the clamping assembly 3, effectively avoiding the risk of the specimen 9 tipping over during the test, which is safer and more reliable. The test accuracy is increased from 55% to 98% compared to non-dedicated pressure equipment. Finally, the driving assembly 4 and the pressure platform 2 are uniformly installed on the test platform 1, which can optimize the structure of the entire device and make the test platform 1 more compact.

[0029] The clamping assembly 3 includes a lower fixed plate 31, an upper fixed plate 32 and a positioning pin 33. The lower fixed plate 31 is fixedly connected to the pressure platform 2 through a bearing 34. The upper fixed plate 32 is fixed to the hydraulic loading assembly 5 through a bolt assembly 35. The grinding sample 9 is installed on the pressure platform 2 through the lower fixed plate 31 and the upper fixed plate 32. A steel ball 36 is provided between the upper fixed plate 32 and the sample 9. The positioning pin 33 is provided between the grinding sample 9. The clamping assembly 3 is configured as a lower fixed plate 31, an upper fixed plate 32 and a positioning pin 33. During installation, since the upper fixed plate 32 is provided with a steel ball 36, the positioning pin 33 is provided between the grinding sample 9. It is placed on the hydraulic loading assembly 5, so that the height of the upper fixed plate 32 can be effectively adjusted, so that there is sufficient installation space during the installation of the grinding sample 9, thereby improving the installation quality of the grinding sample 9. The setting of the locating pin 33 can effectively play the role of axial positioning of the grinding sample 9. The lower fixed plate 31 is fixedly connected to the pressure platform 2 through the bearing 34, and a steel ball 36 is provided between the upper fixed plate 32 and the sample 9, which can ensure that the upper fixed plate 32 and the lower fixed plate 31 are rotated under the driving force of the driving assembly 4, thereby rotating the grinding sample 9 and improving the rotation quality.

[0030] The pressure-bearing platform 2 includes a vertical rod 21 and a horizontal plate 22. The horizontal plate 22 is arranged on the vertical rod 21. The bottom end of the vertical rod 21 is fixedly connected to the test platform 1. The pressure-bearing platform 2 is arranged as a vertical rod 21 and a horizontal plate 22. The drive assembly 4 can be installed on the test platform 1 below the horizontal plate 22, thereby making the entire test platform 1 more compact and preventing the drive assembly 4 and the pressure-bearing platform 2 from forming spatial interference during installation, thereby improving the overall installation quality. A horizontal groove 11 is provided on the test platform 1, and a flange 23 extending outward is provided on the vertical rod 21. The flange 23 is fixedly connected to the horizontal groove 11 by a screw 24. The flange 23 can increase the distance with the test platform 1 contact area to ensure the fixing quality of the vertical rod 21. The screw 24 can simplify the installation structure of the vertical rod 21 and the test platform 1. Moreover, the screw 24 can be restricted by the horizontal groove 11 when fixed, which can improve the fixing quality of the screw 24. The test platform 1 is provided with a shell 12 for installing the hydraulic loading component 5, and a reinforcing plate 13 is provided in the shell 12. The reinforcing plate 13 is provided with a reinforcing rib 14, which can realize the stable installation of the hydraulic loading component 5 and improve the fixing quality of the hydraulic loading component 5. Secondly, the setting of the reinforcing rib 14 and the reinforcing plate 13 can improve the strength of the shell 12, effectively prevent the shell 12 from deformation due to insufficient strength, and improve the service life of the shell 12.

[0031] The hydraulic loading assembly 5 includes a hydraulic pump 50, a hydraulic motor 51, an oil filter 52, an oil tank 53, a one-way valve 54, a pressure gauge 55, a two-position four-way electromagnetic reversing valve 56 and a hydraulic cylinder 57. The hydraulic motor 51 is connected to the hydraulic pump 50. The hydraulic pump 50 includes an oil inlet and an oil outlet. The oil inlet is connected to the oil tank 53 through the oil filter 52. The oil outlet is connected to an oil outlet pipe 7. The oil outlet pipe 7 includes a first pipeline 71 connected to the pressure gauge 55, a second pipeline 72 connected to the electro-hydraulic proportional relief valve 6, and a third pipeline 73 connected to the four-way electromagnetic reversing valve 56. The one-way valve 54 is arranged on the third pipeline 73 and is located between the four-way electromagnetic reversing valve 56 and the hydraulic pump 50. The setting of the one-way valve 54 can prevent the system from When the liquid flows back, the oil filter 52 can filter out impurities in the hydraulic oil and extend the working life of the hydraulic management. The oil outlet pipe 7 is provided with a first pipeline 71, a second pipeline 72 and a third pipeline 73, which can enable the pressure gauge 55, the electro-hydraulic proportional relief valve 6 and the four-way electromagnetic reversing valve 56 to be installed independently of each other. The two-position four-way electromagnetic reversing valve 56 is connected to an accumulator 58 to ensure the hydraulic stability of the pipeline. The accumulator 58 is an energy storage tool. When the system pressure increases instantaneously, it can absorb this part of the energy and release it when the system needs it to keep the pressure of the entire hydraulic system normal. The first pipeline 71 is provided with a stop valve 59 for facilitating the disassembly and assembly of the pressure gauge 55, facilitating the disassembly and assembly of the pressure gauge 55, and adjusting the appropriate opening to prevent the pointer of the pressure gauge 55 from vibrating.

[0032] The hydraulic loading assembly 5 also includes a box body 8 fixedly connected to the housing 12, the hydraulic pump 50, hydraulic motor 51, oil filter 52, oil tank 53, one-way valve 54, pressure gauge 55, and two-position four-way electromagnetic reversing valve 56 are all arranged in the box body 8, and a fixing mechanism 81 for fixing the hydraulic cylinder 57 is fixed on the outer wall of the box body 8, the fixing mechanism 81 includes a fixing plate 82 and a supporting rib 83, the supporting rib 83 includes a horizontal portion 84 and a vertical portion 85, the horizontal portion 84 is arranged at the top of the vertical portion 85, the horizontal portion 84 is fixedly connected to the box body 8, and the fixing plate 82 is fixedly connected to the horizontal portion 84. The setting of the box body 8 can integrate the hydraulic loading assembly 5 into an installation whole, and the overall structure is compact, which also simplifies the installation space of the hydraulic loading assembly 5 on the housing 12. The setting of the fixing mechanism 81 can realize the rapid installation of the hydraulic cylinder 57. The installation and fixation improves the fixing quality of the hydraulic cylinder 57. The fixing mechanism 81 formed by the fixing plate 82 and the supporting ribs 83 can improve the installation strength of the entire fixing mechanism 81. The drive assembly 4 includes a motor 41, a worm gear reducer 42 and a transmission shaft 43. The worm gear reducer 42 includes an output end and an input end. The motor 41 is connected to the input end, and the output end is connected to the transmission shaft 43. The speed and torque sensor 40 is arranged between the output end and the transmission shaft 43, and the driving force of the motor 41 is transmitted to the transmission shaft 43 through the worm gear reducer 42. The transmission shaft 43 is transmitted to the lower fixed plate 31, which can ensure the stability of power transmission. The speed and torque sensor 40 is arranged between the output end and the transmission shaft 43, which can improve the speed and torque collection quality. The speed in this embodiment is preferably set to 0.1r / s, and the rotation time is set to 10s.

[0033] During use, the hydraulic loading system is used to control the piston rod of the hydraulic cylinder 57 to rise, leaving enough space for the placement of the upper and lower grinding specimens 9, and one of the grinding specimens 9 is placed on the lower fixed plate 31, and then the positioning pin 33, the other grinding specimen 9 and the steel ball 36 are placed in sequence. The hydraulic loading system controls the piston rod of the hydraulic cylinder 57 to descend until it contacts the steel ball 36, and fixes the upper fixed plate 32, and controls the hydraulic loading system to apply a light load to the grinding specimen 9. Check whether the upper and lower grinding specimens 9 are shaking or tilted to ensure their stability. If the material of the upper and lower grinding specimens 9 is If the material is metal, the load of the sample 9 is about 100N. If it is other materials, it can be determined according to the material properties. The maximum load of the hydraulic loading system of the present invention is 1.5t. The torque drive system is controlled to make the lower grinding disc drive the lower grinding sample 9 to rotate 360°. The speed is set to 0.1r / s and the rotation time is 10s. During the rotation, the torque during rotation is recorded by the speed torque sensor 40. The hydraulic loading system is controlled to unload and the piston rod of the hydraulic cylinder 57 is raised until there is enough space to remove the upper and lower grinding samples 9. After removing the upper and lower grinding samples 9, it is determined whether the sample 9 is stuck under the estimated load according to the ASTM G196 standard. The estimated load can be increased or decreased according to the sticking situation of the sample 9. The new sample 9 is replaced and tested multiple times.

[0034] The above description is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by any technician in this field within the scope of the present invention are included in the patent scope of the present invention.

Claims

1. A device for testing the anti-seizure performance of materials, characterized by: The test platform comprises a test platform and a pressure-bearing platform arranged on the test platform, wherein the pressure-bearing platform is provided with a clamping assembly for clamping the grinding specimen, the test platform is provided with a drive assembly connected to the clamping assembly, the drive assembly is provided with a speed torque sensor for collecting the rotational torque during the test process, the clamping assembly is connected to a hydraulic loading assembly for applying a load to the clamping assembly, and the hydraulic loading assembly is connected to an electro-hydraulic proportional relief valve for realizing stepless pressure regulation of the hydraulic loading assembly; The hydraulic loading assembly includes a hydraulic pump, a hydraulic motor, an oil filter, an oil tank, a one-way valve, a pressure gauge, a two-position four-way electromagnetic reversing valve and a hydraulic cylinder. The hydraulic motor is connected to the hydraulic pump. The hydraulic pump includes an oil inlet and an oil outlet. The oil inlet is connected to the oil tank through an oil filter. The oil outlet is connected to an oil outlet pipe. The oil outlet pipe includes a first pipeline connected to the pressure gauge, a second pipeline connected to the electro-hydraulic proportional relief valve, and a third pipeline connected to the four-way electromagnetic reversing valve. The one-way valve is arranged on the third pipeline and is located between the four-way electromagnetic reversing valve and the hydraulic pump. The two-position four-way solenoid reversing valve is connected to an accumulator to ensure the hydraulic stability of the pipeline; a shut-off valve is provided on the first pipeline to facilitate the disassembly and assembly of the pressure gauge; the hydraulic loading assembly also includes a box fixedly connected to the outer shell, the hydraulic pump, hydraulic motor, oil filter, oil tank, one-way valve, pressure gauge, and two-position four-way solenoid reversing valve are all arranged in the box, and a fixing mechanism for fixing the hydraulic cylinder is fixed on the outer wall of the box, the fixing mechanism includes a fixing plate and a support rib, the support rib includes a horizontal part and a vertical part, the horizontal part is arranged at the top of the vertical part, the horizontal part is fixedly connected to the box, and the fixing plate is fixedly connected to the horizontal part; the clamping assembly includes a lower fixed plate, an upper fixed plate and a positioning pin, the lower fixed plate is fixedly connected to the pressure platform through a bearing, the upper fixed plate is fixed to the hydraulic loading assembly by a bolt assembly, the grinding specimen is mounted on the pressure platform through the lower fixed plate and the upper fixed plate, a steel ball is provided between the upper fixed plate and the specimen, and the positioning pin is provided between the grinding specimens.

2. The device for testing the anti-seizure performance of materials according to claim 1, characterized in that: The pressure-bearing platform includes a vertical rod and a horizontal plate. The horizontal plate is arranged on the vertical rod, and the bottom end of the vertical rod is fixedly connected to the test platform.

3. The device for testing the anti-seizure performance of materials according to claim 2, characterized in that: The test platform is provided with a horizontal groove, and the vertical rod is provided with a flange extending outward, and the flange is fixedly connected to the horizontal groove by screws.

4. The device for testing the anti-seizure performance of materials according to claim 3, characterized in that: The test platform is provided with a shell for mounting a hydraulic loading assembly, the shell is provided with a reinforcing plate, and the reinforcing plate is provided with reinforcing ribs.

5. The device for testing the anti-seizure performance of materials according to claim 1, characterized in that: The drive assembly includes a motor, a worm gear reducer and a transmission shaft. The worm gear reducer includes an output end and an input end. The motor is connected to the input end, and the output end is connected to the transmission shaft. The speed torque sensor is arranged between the output end and the transmission shaft.

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