A friction test device with controllable ambient temperature and humidity

Abstract

The application discloses an environmental temperature and humidity controllable friction experiment device, which comprises a force measuring rod, a force measuring device and a constant temperature and humidity box, wherein one end of the force measuring rod is arranged in the constant temperature and humidity box, and the other end is connected with the force measuring device; one end of the force measuring rod arranged in the constant temperature and humidity box is provided with a friction pair, the force measuring device can drive the force measuring rod to move at a set moving speed and for a set distance, and the friction force between the friction pair can be measured; and the constant temperature and humidity box can provide controllable environmental temperature and humidity for the friction pair.

Description

Technical Field

[0001] This invention relates to the field of friction testing equipment technology, and specifically to a friction testing device with controllable ambient temperature and humidity. Background Technology

[0002] Friction originates from the interaction between surfaces in relative motion or with a tendency to do so. It is widespread in nature and in human production and daily life. On the one hand, for example, the normal operation of a clutch or the movement of an animal would be impossible without friction; in such cases, friction is essential. On the other hand, the existence of friction means energy loss; for example, the friction between a car's drive shaft and wheel hub leads to a loss of engine output kinetic energy. More importantly, tribology is a cutting-edge discipline with wide applicability and interdisciplinary nature, its foundations involving mechanics, materials science, manufacturing science, and mechanical design. Therefore, accurate measurement and research, and ultimately, effective control of friction, are of great significance to human production, daily life, and the advancement of science and technology. It is well known that in most solid friction pairs, environmental temperature and humidity significantly affect the measurement of friction, especially when the humidity is high or the temperature fluctuates greatly. Water vapor condenses on the friction pair surface, even forming small droplets, which act as lubricants, thus affecting the accurate measurement of friction. However, existing friction testing devices still have shortcomings in this regard, making it difficult to effectively control both temperature and humidity in the test environment simultaneously, thus failing to overcome the influence of environmental temperature and humidity. Furthermore, quantitatively studying the effects of temperature and humidity changes (especially high temperature, high humidity, and below 0°C) on friction using existing equipment presents significant challenges. In summary, designing a friction experimental apparatus capable of simultaneously controlling temperature and humidity within a set temperature and humidity range (temperature control range -20°C to 150°C, humidity control range 15% to 98%), particularly achieving effective control and free adjustment of high temperature, high humidity, and low temperature environments, is of paramount importance. Summary of the Invention

[0003] In view of this, the present invention provides a friction test apparatus with controllable ambient temperature and humidity, which can accurately carry out friction tests under controllable ambient temperature and humidity.

[0004] The technical solution of the present invention is as follows: a friction test device with controllable ambient temperature and humidity, comprising: a force measuring rod, a force measuring device, and a constant temperature and humidity chamber; one end of the force measuring rod is disposed in the constant temperature and humidity chamber, and the other end is connected to the force measuring device; a friction pair is installed at the end of the force measuring rod disposed in the constant temperature and humidity chamber, and the force measuring device can drive the force measuring rod to move a set distance at a set moving speed and measure the friction force between the friction pairs; wherein, the constant temperature and humidity chamber can provide controllable ambient temperature and humidity for the friction pairs.

[0005] Preferably, the friction pair comprises: the test sample and a substrate material.

[0006] Preferably, the constant temperature and humidity chamber includes: a temperature / humidity control device, a temperature / humidity control chamber, and a door; a test platform and a fixture are installed inside the temperature / humidity control chamber; one end of the force measuring rod extends into the temperature / humidity control chamber through a circular hole provided on the constant temperature and humidity chamber, and is connected to the fixture, with the bottom of the fixture holding the test sample; the height of the force measuring rod is adjusted by the force measuring device, thereby adjusting the height of the fixture, so that the test sample carried by the fixture contacts and engages with the substrate material on the upper surface of the test platform; wherein, a door is provided on the side of the constant temperature and humidity chamber, and the temperature / humidity control chamber is installed in the constant temperature and humidity chamber through the door; the temperature / humidity control device is installed on the chamber body of the constant temperature and humidity chamber and connected to the temperature / humidity control chamber, and is used to regulate the temperature and humidity inside the temperature / humidity control chamber to reach the set value.

[0007] Preferably, the clamp includes a ring and a weight; the ring is connected to a force measuring rod, the weight is clamped in the ring, and it is capable of clamping the sample to be tested.

[0008] Preferably, the inner wall of the temperature / humidity control chamber is provided with two or more slots along the height direction. The test platform can be installed in different slots and its corresponding height can be adjusted, thereby adjusting the height between the substrate material and the test sample held by the fixture.

[0009] Preferably, the temperature control range is -20℃ to 150℃, and the relative humidity is controlled at 15% to 98% at the set temperature.

[0010] Preferably, the force measuring device includes: a force measuring device housing, a motor, a belt, a threaded rod, a moving platform, a workbench, a positioning nut, a horizontal beam, a force sensor, and a column;

[0011] An electric motor is installed on one side inside the housing of the force measuring device, and a threaded rod is installed at the top inside. The output shaft of the electric motor is connected to the threaded rod via a belt. The threaded rod and the moving platform form a screw-nut pair. A worktable is provided on the upper surface of the outer surface of the force measuring device housing. Two parallel guide grooves are provided on the worktable. Two vertical columns are provided on the upper surface of the moving platform. The two columns extend from the upper end of the force measuring device housing and can slide longitudinally in the two guide grooves on the worktable.

[0012] A horizontal beam is provided between the upper ends of the two columns. The two ends of the horizontal beam are locked to the two columns at a set height position by positioning nuts. A force sensor is provided in the middle of the horizontal beam. The force sensor is connected to the test sample set inside the constant temperature and humidity chamber through a force measuring rod.

[0013] Preferably, the force measuring device further includes a limiting device; the moving platform is connected to the limiting device, and the limiting device restricts the moving platform from moving within a set range.

[0014] Preferably, the height of the force measuring rod can be adjusted by adjusting the locking height of the positioning nut on the column.

[0015] Beneficial effects:

[0016] 1. The friction test apparatus of the present invention, while ensuring experimental accuracy, uses a constant temperature and humidity chamber to simply and reliably control the temperature and humidity in the experimental environment. It can accurately carry out friction experiments under controllable temperature and humidity conditions. It is easy to operate, produces stable and reliable results, and has low cost, making it of great application significance. At the same time, for some experiments that are not sensitive to ambient temperature and humidity, the experimental apparatus can also be used without the constant temperature and humidity chamber, and the experiment can be carried out at room temperature using a force measuring device.

[0017] 2. The specific configuration of the constant temperature and humidity chamber in this invention can effectively provide the set ambient temperature and humidity for the friction pairs installed inside it.

[0018] 3. The adjustable height of the test platform on the inner wall of the temperature / humidity control chamber in this invention can effectively adjust the height between the substrate material and the test sample held by the fixture.

[0019] 4. This invention controls the temperature and humidity of the experimental environment through a constant temperature and humidity chamber, enabling stable friction experiments of friction pairs to be carried out in an environment with a temperature control range of -20℃ to 150℃ and a relative humidity control range of 15% to 98%, and effectively avoiding the significant impact of ambient temperature and humidity on experimental accuracy.

[0020] 5. The specific configuration of the force measuring device in this invention involves using an electric motor to drive the moving platform, force measuring rod, fixture, and test sample to achieve relative friction between the friction pair fixed between the fixture and the test platform. The normal pressure applied to the friction pair originates from the gravity of the weights. This effectively eliminates measurement errors caused by mechanical fit, resulting in more accurate friction force data. Furthermore, the device is simple in structure and easy to operate. Simultaneously, the friction experimental device of this invention places the force sensor outside the constant temperature and humidity chamber, effectively protecting it from the influence of temperature and humidity changes. This ensures the testing accuracy and lifespan of the force sensor. Additionally, it effectively reduces the experimental space required for temperature and humidity control, improving experimental efficiency and reducing energy consumption.

[0021] 6. The present invention limits the movement of the mobile platform by using a limiting device, which can effectively ensure that the mobile platform moves within a safe area. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the friction experimental apparatus of the present invention.

[0023] Figure 2 This is a front view of the force measuring device in this invention.

[0024] Figure 3 This is a top view of the force measuring device in this invention.

[0025] Figure 4 This is a left view of the force measuring device in this invention.

[0026] Figure 5 This is a right view of the constant temperature and humidity chamber in this invention.

[0027] Among them, 1-force measuring device housing, 2-motor, 3-belt, 4-threaded rod, 5-moving platform, 6-workbench, 7-positioning nut, 8-horizontal beam, 9-force sensor, 10-force measuring rod, 11-ring, 12-weight, 13-constant temperature and humidity chamber, 14-test platform, 15-round hole, 16-limiting device, 17-column, 18-guide groove, 19-temperature / humidity control device, 20-temperature / humidity control chamber, 21-test sample, 22-chamber door. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] This embodiment provides a friction test apparatus with controllable ambient temperature and humidity, which can accurately carry out friction tests under controllable ambient temperature and humidity.

[0030] like Figure 1As shown, the friction experimental apparatus includes: a force measuring device connected via a force measuring rod 10 and a constant temperature and humidity chamber 13, as shown. Figure 2-4 As shown, the force measuring device includes: a force measuring device housing 1, a motor 2, a belt 3, a threaded rod 4, a moving platform 5, a worktable 6, a positioning nut 7, a horizontal beam 8, a force sensor 9, and a column 17, as follows. Figure 5 As shown, the constant temperature and humidity chamber 13 is equipped with: a temperature / humidity control device 19, a temperature / humidity control chamber 20, and a chamber door 22; the temperature / humidity control chamber 20 is equipped with a test platform 14 and fixtures (including: a ring 11 and weights 12).

[0031] The connection relationship of the friction test device is as follows: a motor 2 is installed on one side of the inside of the force measuring device housing 1, and a threaded rod 4 is installed at the top inside. The output shaft of the motor 2 is connected to the threaded rod 4 through a belt 3 (the belt 3 is tensioned between the output shaft of the motor 2 and the threaded rod 4) to realize belt drive; a moving platform 5 is threadedly connected to the threaded rod 4, and the two form a screw and nut pair; a worktable 6 is provided on the upper end surface of the outer surface of the force measuring device housing 1, and two parallel guide grooves 18 are provided on the worktable 6; two vertical columns 17 are provided on the upper surface of the moving platform 5, and the two columns 17 extend from the upper end of the force measuring device housing 1 and can slide longitudinally in the two guide grooves 18 on the worktable 6 respectively; wherein, the moving platform 5 is connected to a limiting device 16, which restricts the movement of the moving platform 5 within a set safety range;

[0032] A horizontal beam 8 is provided between the upper ends of the two columns 17. The two ends of the horizontal beam 8 are locked to the two columns 17 at a set height position by positioning nuts 7. A force sensor 9 is provided in the middle of the horizontal beam 8. The force sensor 9 is connected to the test sample 21 set inside the constant temperature and humidity chamber 13 through a force measuring rod 10.

[0033] One end of the force-measuring rod 10 extends into the temperature and humidity chamber 13 through a circular hole 15 on the chamber 13 and into the temperature / humidity control chamber 20 inside the chamber 13. It connects to a circular ring 11 inside the chamber 20. A weight 12 is clamped inside the ring 11, which serves as a clamp, and the bottom of the ring holds the test sample 21. The height of the horizontal beam 8 is adjusted by the positioning nut 7, thereby adjusting the height of the force-measuring rod 10 and the ring 11, ensuring good contact between the test sample 21 carried by the clamp and the base material on the upper surface of the test platform 14. The inner wall of the temperature / humidity control chamber 20 has grooves of different heights. The test platform 14 is installed in slots of different heights, which can effectively adjust its corresponding height, thereby adjusting the height between the substrate material set on it and the test sample 21 held by the fixture; the constant temperature and humidity chamber 13 is provided with a door 22 on its side, and the temperature / humidity control chamber 20 is set in the constant temperature and humidity chamber 13 through the door 22; the temperature / humidity control device 19 is set on the chamber body of the constant temperature and humidity chamber 13 and connected to the temperature / humidity control chamber 20, and is used to regulate the temperature and humidity inside the temperature / humidity control chamber 20 to reach the set value; in this embodiment, the temperature control range is -20℃ to 150℃, and the relative humidity control range is 15% to 98% at this set temperature;

[0034] The temperature and humidity during the experiment can be controlled by the temperature / humidity control device 19, which controls the operation of the compressor, heating element and humidification device inside the temperature / humidity control chamber 20. At the same time, the temperature and humidity inside the temperature / humidity control chamber 20 are detected and adjusted in real time by the temperature sensor and humidity sensor, so that they are kept stable at the set value, so as to ensure that the experiment is carried out under the set temperature and humidity.

[0035] The working principle of this friction testing device is as follows: When measuring the frictional force between the test sample 21 and the substrate material in a set temperature and humidity environment, firstly, open the door 22 of the constant temperature and humidity chamber 13, fix the substrate material on the test platform 14, and then adjust the positioning nut 7 so that the ring 11 is slightly higher than the substrate material; then close the door 22, and initially adjust the temperature / humidity control device 19 so that the temperature and humidity in the temperature / humidity control chamber 20 reach the set values. This ensures that the substrate material is within the set temperature and humidity. The environment reaches a stable state; then the chamber door 22 is opened and the test sample 21 is fixed on the set weight 12, and the weight 12 is clamped in the ring 11 so that the test sample 21 is in free contact with the substrate material; the chamber door 22 is closed, and the temperature and humidity in the temperature / humidity control chamber 20 of the constant temperature and humidity chamber 13 are brought to the set value and kept constant under the control of the temperature / humidity control device 19; after the temperature and humidity in the constant temperature and humidity chamber 13 reach the set value, the parameters on the force measuring device (moving speed, moving distance) are set. The experiment begins after the number of cycles is determined. During the experiment, the host computer controls the motor 2 to rotate via the belt 3, which drives the threaded rod 4 to rotate. This causes the moving platform 5 to slide along the guide groove 18 on the worktable 6. The moving platform 5 is connected to the force sensor 9 via the column 17 and the horizontal beam 8, and then connected to the test sample 21 via the force measuring rod 10, the ring 11, and the weight 12. In this way, while the weight 12 clamps the test sample 21 and applies a set value of positive pressure to the substrate material, the motor 2 drives the test sample 21 to move at a set speed, thereby measuring the frictional force of the test sample 21 relative to the substrate material. In this case, the positive pressure on the test sample 21 comes only from the weight 12, and the magnitude of the tangential force (which is the same as the frictional force being measured but in the opposite direction) is measured by the force sensor 9. Therefore, the measured frictional force can effectively avoid inaccurate experimental data caused by mechanical errors. The parameters such as the moving speed, moving distance, and number of cycles of the moving platform 5 on the force measuring device can be set by the host computer.

[0036] After a measurement is completed, the temperature and humidity in the temperature / humidity control chamber 20 can be changed by the temperature / humidity control device 19, and the experiment can be repeated. This way, the precise friction force under the same positive pressure, different ambient temperature, ambient humidity, and relative moving speed can be obtained. After the experiment under the same positive pressure is completed, the chamber door 22 can be opened, the weight of the weight 12 can be changed, and the above experimental process can be repeated. This way, the friction force of the test sample 21 under different positive pressures can be tested.

[0037] During the test, due to the presence of the round hole 15 on the constant temperature and humidity chamber 13, the temperature / humidity control chamber 20 is not completely sealed. However, the temperature / humidity control device 19 will adjust the temperature and humidity in the temperature / humidity control chamber 20 in real time. In addition, the round hole 15 is very small relative to the temperature / humidity control chamber 20, so it is relatively easy to obtain a constant temperature and humidity in the temperature / humidity control chamber 20.

[0038] In addition, it should be noted that this friction testing device can also be used to perform tensile and compression tests under set temperature and humidity conditions. Various tests can be performed on different test samples 21 and substrate samples. For example, it can test the tensile strength of ice at a specific temperature, the bonding strength between the ice surface and the substrate surface, etc.

[0039] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A friction experimental apparatus with controllable ambient temperature and humidity, characterized in that, include: The instrument comprises a force measuring rod (10), a force measuring device, and a constant temperature and humidity chamber (13); one end of the force measuring rod (10) is placed in the constant temperature and humidity chamber (13), and the other end is connected to the force measuring device; a friction pair is installed at one end of the force measuring rod (10) placed in the constant temperature and humidity chamber (13); the force measuring device can drive the force measuring rod (10) to move a set distance at a set moving speed and measure the friction force between the friction pairs; wherein, the constant temperature and humidity chamber (13) can provide controllable ambient temperature and humidity for the friction pairs; The friction pair includes: the test sample (21) and the substrate material; The constant temperature and humidity chamber (13) includes: a temperature / humidity control device (19), a temperature / humidity control chamber (20), and a chamber door (22); the temperature / humidity control chamber (20) is equipped with a test platform (14) and a fixture; one end of the force measuring rod (10) extends into the constant temperature and humidity chamber (13) through a round hole (15) provided on the constant temperature and humidity chamber (13) and is connected to the fixture, the bottom of the fixture clamps the test sample (21); the height of the force measuring rod (10) is adjusted by the force measuring device, thereby realizing the height adjustment of the fixture, so that the test sample (21) carried by the fixture contacts and cooperates with the base material provided on the upper surface of the test platform (14); The fixture includes a ring (11) and a weight (12); the ring (11) is connected to a force measuring rod (10), the weight (12) is located in the ring (11), the test sample (21) is embedded in a groove at the bottom of the weight (12), and the bottom surface of the test sample (21) serves as a friction surface in contact with the base material; and the outer diameter of the weight (12) is smaller than the inner diameter of the ring (11), and the weight (12) can move freely up and down within the ring (11).

2. The friction test apparatus with controllable ambient temperature and humidity as described in claim 1, characterized in that, in, The constant temperature and humidity chamber (13) has a door (22) on its side. The temperature / humidity control chamber (20) is installed in the constant temperature and humidity chamber (13) through the door (22). The temperature / humidity control device (19) is installed on the body of the constant temperature and humidity chamber (13) and connected to the temperature / humidity control chamber (20) to regulate the temperature and humidity inside the temperature / humidity control chamber (20) so that it reaches the set value.

3. The friction test apparatus with controllable ambient temperature and humidity as described in claim 2, characterized in that, The temperature / humidity control chamber (20) has two or more slots along the height direction on the inner wall surface. The test platform (14) is installed in different slots and its corresponding height can be adjusted, thereby adjusting the height between the substrate material and the test sample (21) held by the fixture.

4. The friction test apparatus with controllable ambient temperature and humidity as described in claim 2, characterized in that, The temperature control range is -20℃ to 150℃, and the relative humidity is controlled at 15% to 98% at the set temperature.

5. The friction test apparatus with controllable ambient temperature and humidity as described in claim 2, characterized in that, The force measuring device includes: a force measuring device housing (1), a motor (2), a belt (3), a threaded rod (4), a moving platform (5), a workbench (6), a positioning nut (7), a horizontal beam (8), a force sensor (9), and a column (17); An electric motor (2) is installed on one side of the inside of the force measuring device housing (1), and a threaded rod (4) is installed at the top inside. The output shaft of the electric motor (2) is connected to the threaded rod (4) through a belt (3). The threaded rod (4) and the moving platform (5) form a screw and nut pair. A worktable (6) is provided on the upper surface of the outer surface of the force measuring device housing (1). Two parallel guide grooves (18) are provided on the worktable (6). Two vertical columns (17) are provided on the upper surface of the moving platform (5). The two columns (17) pass through the upper end of the force measuring device housing (1) and can slide longitudinally in the two guide grooves (18) on the worktable (6). A horizontal beam (8) is provided between the upper ends of the two columns (17). The two ends of the horizontal beam (8) are locked to the two columns (17) at the set height position of the columns (17) by positioning nuts (7). A force sensor (9) is provided in the middle of the horizontal beam (8). The force sensor (9) is connected to the test sample (21) set inside the constant temperature and humidity chamber (13) through a force measuring rod (10).

6. The friction test apparatus with controllable ambient temperature and humidity as described in claim 5, characterized in that, The force measuring device further includes a limiting device (16); the moving platform (5) is connected to the limiting device (16), and the limiting device (16) restricts the moving platform (5) from moving within a set range.

7. The friction test apparatus with controllable ambient temperature and humidity as described in claim 5, characterized in that, The height of the force measuring rod (10) can be adjusted by adjusting the locking height of the positioning nut (7) on the column (17).

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