Friction test bench

Abstract

The invention discloses a friction test bench, which comprises a vibration isolation platform, a sliding table, a heating piece, a first bracket, a pressure sensor and a temperature sensor, and is characterized in that the vibration isolation platform extends along a first direction; the sliding table is movably connected with the vibration isolation platform. And the heating piece is connected to the top surface of the sliding table and is used for mounting a lower friction sample and heating the lower friction sample. The first support is connected with the vibration isolation platform. One end of the pressure sensor is connected with the first support, the other end of the pressure sensor is used for installing an upper friction sample, and the upper friction sample is located on the top face of the lower friction sample. The temperature sensor is connected with the vibration isolation platform and used for sensing the temperature of the lower friction sample.

Description

Technical Field

[0001] The invention relates to the technical field of friction force testing devices, and in particular to a friction test bench. Background Art

[0002] The friction test device is used to measure the friction between two contacting objects, and can provide data support for building a physical model and mathematical description of the contact between the two objects. The friction test device involves many industrial fields such as traditional mechanical processing, transportation, aerospace, ocean, chemical industry, and bioengineering. It is a basic device for revealing the factors affecting friction, studying friction energy dissipation, and seeking effective lubrication and surface treatment technologies. It is of great significance to solve the dynamic response of objects under contact friction, greatly improve mechanical efficiency, and ensure long-term and reliable operation of machinery.

[0003] The friction contact surface temperature and the relative movement speed of the two contacting objects both affect the magnitude of the friction force. Currently, most friction testing equipment cannot simulate the ambient temperature of the two contacting objects, nor can it monitor the temperature changes of the contact interface. Summary of the invention

[0004] The purpose of the present invention is to provide a friction test bench to solve the problems of the prior art.

[0005] In order to solve the above technical problems, an embodiment of the present invention provides a friction test bench, which comprises:

[0006] A vibration isolation platform, wherein the vibration isolation platform extends along a first direction;

[0007] A slide table, the slide table is movably connected to the vibration isolation platform;

[0008] A heating element connected to the top surface of the slide table and used for mounting a lower friction sample and heating the lower friction sample;

[0009] a first bracket, the first bracket being connected to the vibration isolation platform;

[0010] a pressure sensor, one end of which is connected to the first bracket, and the other end of which is used to mount an upper friction sample, the upper friction sample being located on the top surface of the lower friction sample; and

[0011] A temperature sensor is mounted on the vibration isolation platform and is used to sense the temperature of the lower friction sample.

[0012] In one embodiment, the top surface of the vibration isolation platform is provided with a guide rail extending along the first direction;

[0013] The slide table is movably connected to the guide rail.

[0014] In one embodiment, the friction test bench further comprises:

[0015] a driver, the driver being fixed to the vibration isolation platform; and

[0016] A ball screw, one end of which is connected to the driver, and the other end of which is connected to the slide;

[0017] The driver drives the slide to move along the first direction through the ball screw.

[0018] In one embodiment, the friction test bench further includes a displacement sensor, which is installed on the vibration isolation platform and is used to detect the displacement of the slide table.

[0019] In one embodiment, the second bracket is covered on the outside of the driver and fixedly mounted on the vibration isolation platform;

[0020] The displacement sensor is mounted on the second bracket.

[0021] In one embodiment, the friction test bench further comprises a base, and the base is magnetically connected to the vibration isolation platform;

[0022] The temperature sensor is mounted on the base.

[0023] In one embodiment, the friction test bench further comprises two steel shafts, wherein two ends of one of the steel shafts are respectively connected to one end of the pressure sensor and the first bracket;

[0024] One end of the other steel shaft is connected to the other end of the pressure sensor, and the other end is used to mount the upper friction sample.

[0025] In one embodiment, the friction test bench further includes an acceleration sensor, and the acceleration sensor is mounted on the upper friction sample.

[0026] In one embodiment, the temperature sensor is an infrared temperature sensor.

[0027] In one embodiment, the friction test bench further comprises:

[0028] A temperature control device, the temperature control device is connected to the heating element and is used to control the temperature of the heating element;

[0029] A control module, wherein the control module is electrically connected to the temperature control device, the pressure sensor and the temperature sensor, and is used to control the start-up of the temperature control device and receive data from the pressure sensor and the temperature sensor.

[0030] In one embodiment, the friction test bench further comprises:

[0031] A driver is fixed on the vibration isolation platform

[0032] A ball screw, one end of which is connected to the driver, and the other end of which is connected to the slide;

[0033] a displacement sensor, the displacement sensor being mounted on the vibration isolation platform and used for detecting the displacement of the slide; and

[0034] A control module is electrically connected to the driver, the pressure sensor, the temperature sensor and the displacement sensor, and is used to control the driver to start and receive data from the pressure sensor, the temperature sensor and the displacement sensor.

[0035] The present invention uses a heating element to directly control the temperature of the friction contact interface, and places a non-contact infrared temperature sensor outside the contact interface, which can realize real-time monitoring of the contact surface temperature. The present invention uses a servo motor with a ball screw, and sends a real-time changing pulse signal to the servo motor through a control module to realize the variable speed reciprocating rotation of the servo motor and the variable speed reciprocating motion of the slide. A laser displacement sensor is used to monitor the displacement change of the slide in real time, and speed information can be extracted from the displacement information. The friction test bench proposed by the invention has a simple structure and is easy to operate. It can provide an accurate and reliable test basis for studying the influence of the temperature of the friction interface and the speed between the friction test pieces on the friction characteristics, and the monitoring of temperature and relative speed can provide effective verification for the research results. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a three-dimensional diagram of a friction test bench according to an embodiment of the present invention.

[0037] Figure 2 yes Figure 1 Front view of the friction test bench in the illustrated embodiment.

[0038] Figure 3 yes Figure 1 Right side view of the friction test bench in the illustrated embodiment.

[0039] Figure numerals: 10, friction test bench; 1, vibration isolation platform; 11, guide rail; 12, ball screw; 2, slide; 21, heating element; 22, lower friction sample; 3, first bracket; 31, pressure sensor; 32, steel shaft; 33, upper friction sample; 34, weight; 36, acceleration sensor; 4, second bracket; 41, displacement sensor; 5, base; 6, temperature sensor; 7, servo motor; 8, temperature control device; 9, control module; DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the present invention clearer, the following will be described in detail with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that in the various embodiments of the present invention, many technical details are provided in order to enable the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed for protection in the claims of the present application can be implemented.

[0041] Unless the context requires otherwise, throughout the specification and claims, the word "comprise" and variations such as "include" and "have" should be construed in an open, inclusive sense, ie, should be interpreted as "including, but not limited to."

[0042] The following will be described in detail with reference to the accompanying drawings to provide a clearer understanding of the purpose, features and advantages of the present invention. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to illustrate the essential spirit of the technical solution of the present invention.

[0043] References throughout the specification to "one embodiment" or "an embodiment" indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of "in one embodiment" or "in an embodiment" in various places throughout the specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any manner in one or more embodiments.

[0044] As used in this specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "and / or" unless the context clearly dictates otherwise.

[0045] In the following description, in order to clearly show the structure and working mode of the present invention, many directional words will be used for description, but the words "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", "down", etc. should be understood as convenient terms and should not be understood as restrictive terms.

[0046] like Figure 1-3As shown, the present invention relates to a friction test bench 10, which includes a vibration isolation platform 1, a slide 2, a heating element 21, a first bracket 3, a second bracket 4, a displacement sensor 41 installed on the second bracket 4, a pressure sensor 31, a base 5, a temperature sensor 6 installed on the base 5, a driver, a ball screw 12, a temperature control device 8 and a control module 9. The friction test bench 10 is used to measure the friction force between two contacting objects, the two objects are defined as a lower friction sample 22 and an upper friction sample 33, and the friction test bench can realize the control and monitoring of the contact interface temperature, and can realize the sinusoidal variable speed relative motion of the contacting objects.

[0047] In a specific embodiment, the vibration isolation platform 1 is a platform provided to avoid the influence of vibration on the friction test, and the vibration isolation platform 1 extends along a first direction.

[0048] The guide rail 11 is connected to the top surface of the vibration isolation platform 1 and extends along the first direction, and the slide 2 is movably connected to the guide rail 11. In other embodiments, a groove may be provided in the vibration isolation platform 1, and the guide rail 11 may be installed in the groove of the vibration isolation platform 1, or the guide rail 11 and the vibration isolation platform 1 may be integrally formed.

[0049] The slide 2 has a support surface for supporting a heating element 21. The heating element 21 is connected to the top surface of the slide 2, and the heating element 21 is a cast aluminum alloy heating plate, and is laid flat on the top surface of the support surface. The heating element 21 is connected to a temperature control device 8, and the temperature control device 8 can control the temperature of the heating element 21.

[0050] The top surface of the heating element 21 is used to install the lower friction sample 22 . The lower friction sample 22 needs to be fixed on the top surface of the heating element 21 . The heating element 21 can heat the lower friction sample 22 .

[0051] The first bracket 3 and the second bracket 4 are respectively located at the front and rear ends of the guide rail 11. The first bracket 3 is located at the front end of the guide rail 11 and is roughly L-shaped. The first bracket 3 adopts an L-shaped steel plate and the bottom end is fixed to the top surface of the vibration isolation platform 1 by screws.

[0052] One side of the pressure sensor 31 is connected to the top of the first bracket 3 through a steel shaft 32, and the steel shaft 32 is fixed to the top of the first bracket 3 with a nut. The other side of the pressure sensor 31 is connected to another steel shaft 32, and the steel shaft 32 can be installed with an upper friction sample 33, and the upper friction sample 33 is located on the top surface of the lower friction sample 22.

[0053] That is, two steel shafts 32 are respectively threadedly connected on both sides of the pressure sensor 31, one of which is located at the front end of the pressure sensor 31 and connected to the first bracket 3. The other steel shaft 32 is located at the rear end of the pressure sensor 31 and is used to install the upper friction sample 33. During operation, the slide 2 drives the lower friction sample 22 to move left and right, and generates friction with the fixed upper friction sample 33. The pressure sensor 31 measures the pressure difference between the left and right steel shafts 32, and then measures the magnitude of the friction force.

[0054] The upper friction test sample can add a weight 34 to increase the pressure between the upper friction sample 33 and the lower friction sample 22 to ensure the generation of friction force during relative motion. The ball screw drives the slide 2 to move in the first direction, and the lower friction sample 22 moves accordingly. The upper friction sample 33 is fixed on the first bracket 3 through the steel shaft 32, the pressure sensor 31 and another steel shaft 32, and the first bracket 3 is fixed on the vibration isolation platform 1. Regardless of how the lower friction sample 22 moves, the upper friction sample 33 remains fixed. The pressure sensor 31 is placed between the two steel shafts 32 to measure the lateral pressure difference between the two steel shafts 32. Since the steel shaft 32 connected to the front end of the pressure sensor 31 is fixed on the first bracket 3, and the steel shaft 32 connected to the rear end of the pressure sensor 31 is fixed on the upper friction sample 33, the two steel shafts 32 are in a semi-suspended state, resulting in the force sensor test value not being 0 when there is no relative motion. After the relative movement of the upper and lower friction samples begins, the pressure measured at the rear end of the pressure sensor 31 has one more friction force on the upper friction sample 33 than the pressure measured at the stationary moment. Therefore, the value measured by the pressure sensor 31 after the relative movement starts minus the value when the relative movement is static is the magnitude of the friction between the two.

[0055] The second bracket 4 is installed at the rear end of the guide rail 11 . The second bracket 4 is roughly in a ring shape surrounding the driver, and the bottom end of the second bracket 4 is connected to the vibration isolation platform 1 by bolts.

[0056] The ball screw 12 extends along the first direction and is located above the guide rail 11. The ball screw 12 is used to drive the slide 2 to move along the first direction. The front end of the ball screw 12 is rotatably connected to a support, and the bottom end of the support is fixedly connected to the vibration isolation platform 1 and is located between the guide rail 11 and the first bracket 3.

[0057] The output shaft of the driver is connected to the rear end of the ball screw 12 through a bearing. The slide 2 is connected to the ball screw 12. After the driver is started, it can drive the ball screw 12 to rotate and drive the slide 2 to move along the first direction. Specifically, the servo motor 7 is electrically connected to the control module 9, and the control module 9 controls the pulses sent to the servo motor 7 to control the rotation angle of the servo motor 7. According to the sinusoidal speed change motion state to be achieved, the sinusoidal curve displacement is approximated as a plurality of segmented straight lines, and the number and time of pulse emission corresponding to each segmented straight line are designed, and finally the sinusoidal change of the rotation angle of the servo motor 7 is achieved. The servo motor 7 adopts a bearing to connect the ball screw, and the ball screw converts the sinusoidal rotational motion of the servo motor 7 into the sinusoidal translational motion of the slide 2. For other speed change situations, it is only necessary to set the corresponding number and time of pulses.

[0058] The second bracket 4 is covered above the driver and fixedly connected to the vibration isolation platform 1 at both ends, and is used to install the displacement sensor 41 to ensure that the displacement sensor 41 measurement is not affected by the movement of the slide 2 and the vibration of the servo motor 7. The actual relative movement speed is measured according to the measured movement displacement of the slide 2, so that the friction force measurement of the friction test piece under the variable speed movement can be achieved. The displacement sensor 41 is preferably a laser displacement sensor 41. In other words, the laser displacement sensor 41 uses laser ranging to obtain the variable speed movement displacement of the slide 2, and then calculates the variable speed movement speed. The variable speed movement displacement and speed are the relative displacement and relative speed between the upper and lower friction samples 22.

[0059] It should be understood that in other embodiments, the second bracket 4 may also be disposed at other positions of the vibration isolation platform 1 , and the displacement sensor 41 may also be directly mounted on the vibration isolation platform 1 .

[0060] The temperature sensor 6 is connected to the vibration isolation platform 1 through the base 5 and is aligned with the lower friction sample 22, so as to sense the temperature of the lower friction sample 22. The base 5 can be connected to various platforms by magnetic attraction, so as to facilitate the movement of the position. Of course, in other embodiments, the base 5 can also be fixed on the vibration isolation platform 1, or the stability sensor can be directly fixed on the vibration isolation platform 1. The temperature sensor 6 is preferably an infrared temperature sensor 6.

[0061] By adopting the above technical solution, the temperature is preset in the temperature control device 8 to heat the heating element 21. The lower friction sample 22 is fixed on the heating element 21, and the temperature of the contact interface of the upper and lower friction samples 22 is changed by heat conduction. The infrared light temperature sensor 6 is fixed by the magnetic base 5 and the vibration isolation platform 1, and the infrared light emitting head of the infrared light temperature sensor 6 is aimed at the edge part where the upper and lower friction samples 22 contact, so as to realize non-contact measurement of the temperature of the friction contact interface. And when the lower friction sample 22 moves with the slide 2, due to the fixation of the upper friction sample 33, the measurement position of the infrared light temperature sensor 6 is also fixed, so the contact surface temperature can be monitored during the friction process.

[0062] That is, the temperature sensor 6 measures the friction interface temperature of the upper and lower friction samples 22, the displacement sensor 41 measures the relative displacement and relative speed that generate the friction force, and the pressure sensor 31 measures the magnitude of the friction force. The temperature, displacement, speed and friction force finally obtained can be used for subsequent friction research.

[0063] As a preferred solution, the friction test bench 10 further includes an acceleration sensor 36, which can be installed on the upper friction sample 33 and connected to the upper friction sample 33 by pasting. The acceleration sensor 36 is used to test the vibration of the upper friction sample 33 to prevent the vibration from interfering with the friction test. In some embodiments, the acceleration sensor 36 may not be provided.

[0064] The control module 9 is electrically connected to the driver, the temperature control device 8, the pressure sensor 31, the temperature sensor 6 and the displacement sensor 41, and is used to control the start-up of the driver and the temperature control device 8, and control the operation of the driver and the temperature control device 8. It can also receive data from the pressure sensor 31, the temperature sensor 6 and the displacement sensor 41, so that the operator can collect the data for experimental operations.

[0065] The present invention uses a heating element 21 to directly control the temperature of the friction contact interface, and a non-contact infrared temperature sensor 6 is placed outside the contact interface to achieve real-time monitoring of the contact surface temperature. The present invention uses a servo motor 7 with a ball screw, and sends a real-time changing pulse signal to the servo motor 7 through a control module 9 to achieve variable speed reciprocating rotation of the servo motor 7 and variable speed reciprocating motion of the slide 2. A laser displacement sensor 41 is used to monitor the displacement change of the slide 2 in real time, and speed information can be extracted from the displacement information. The friction test bench 10 proposed in the invention has a simple structure and is easy to operate. It can provide an accurate and reliable test basis for studying the influence of the temperature of the friction interface and the speed between the friction test pieces on the friction characteristics, and the monitoring of temperature and relative speed can provide effective verification for the research results.

[0066] Preferred embodiments of the present invention have been described above in detail, but it should be understood that aspects of the embodiments can be modified, if necessary, to employ aspects, features and concepts of the various patents, applications and publications to provide further embodiments.

[0067] These and other changes can be made to the embodiments in light of the above detailed description.In general, in the claims, the terms used should not be considered limited to the specific embodiments disclosed in the specification and the claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which these claims are entitled.

[0068] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A friction test bench, characterized in that: The friction test bench comprises: A vibration isolation platform, wherein the vibration isolation platform extends along a first direction; A slide table, the slide table is movably connected to the vibration isolation platform; A heating element connected to the top surface of the slide table and used for mounting a lower friction sample and heating the lower friction sample; a first bracket, the first bracket being connected to the vibration isolation platform; a pressure sensor, one end of which is connected to the first bracket, and the other end of which is used to mount an upper friction sample, the upper friction sample being located on the top surface of the lower friction sample; and A temperature sensor is mounted on the vibration isolation platform and is used to sense the temperature of the lower friction sample.

2. The friction test bench according to claim 1, characterized in that: The top surface of the vibration isolation platform is provided with a guide rail extending along the first direction; The slide table is movably connected to the guide rail.

3. The friction test bench according to claim 2, characterized in that: The friction test bench also includes: a driver, the driver being fixed to the vibration isolation platform; and A ball screw, one end of which is connected to the driver, and the other end of which is connected to the slide; The driver drives the slide to move along the first direction through the ball screw.

4. The friction test bench according to claim 3, characterized in that: The friction test bench also includes a displacement sensor, which is installed on the vibration isolation platform and is used to detect the displacement of the slide table.

5. The friction test bench according to claim 4, characterized in that: The friction test bench also includes a second bracket, which is covered on the outside of the driver and fixedly mounted on the vibration isolation platform; The displacement sensor is mounted on the second bracket.

6. The friction test bench according to claim 1, characterized in that: The friction test bench also includes a base, and the base is magnetically connected to the vibration isolation platform; The temperature sensor is mounted on the base.

7. The friction test bench according to claim 1, characterized in that: The friction test bench also includes two steel shafts, wherein two ends of one of the steel shafts are respectively connected to one end of the pressure sensor and the first bracket; One end of the other steel shaft is connected to the other end of the pressure sensor, and the other end is used to mount the upper friction sample.

8. The friction test bench according to claim 1, characterized in that: The friction test bench further includes an acceleration sensor, which is mounted on the upper friction sample.

9. The friction test bench according to claim 1, characterized in that: The temperature sensor is an infrared temperature sensor.

10. The friction test bench according to claim 1, characterized in that: The friction test bench also includes: A temperature control device, the temperature control device is connected to the heating element and is used to control the temperature of the heating element; A control module, wherein the control module is electrically connected to the temperature control device, the pressure sensor and the temperature sensor, and is used to control the start-up of the temperature control device and receive data from the pressure sensor and the temperature sensor.

11. The friction test bench according to claim 1, characterized in that: The friction test bench also includes: A driver is fixed on the vibration isolation platform A ball screw, one end of which is connected to the driver, and the other end of which is connected to the slide; a displacement sensor, the displacement sensor being mounted on the vibration isolation platform and used for detecting the displacement of the slide; and A control module is electrically connected to the driver, the pressure sensor, the temperature sensor and the displacement sensor, and is used to control the driver to start and receive data from the pressure sensor, the temperature sensor and the displacement sensor.

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