Testing device for four-ball testing machine for current-carrying friction

Abstract

The utility model provides a testing device for a four-ball testing machine for current-carrying friction, the four-ball testing machine comprises a lifting platform and a rotating motor arranged above the lifting platform, and the testing device comprises a sample cup and a clamp; the sample cup is placed on the lifting platform and comprises an insulating cup body, a small ball pressing part and a current generator; the upper end face of the insulating cup body is provided with a columnar groove, the inner wall of the columnar groove is covered with a metal material, the bottom surface of the columnar groove is provided with a metal pad, and three small balls for experiments are placed in the columnar groove; the metal pad is connected with a current generator arranged in the insulating cup body, and the columnar groove is filled with current generated by the current generator; the upper end of the clamp is provided with an insulating sleeve and connected with a rotating motor, and the lower end of the clamp clamps a small ball; the small ball pressing part is arranged at the upper end of the columnar groove, and the lower end of the small ball pressing part abuts against the small ball; an opening is formed in the small ball pressing part in a penetrating mode, and the lower end of the clamp extends into the columnar groove. According to the device, a stable current-carrying friction experiment is carried out through the four-ball experiment machine.

Description

Technical Field

[0001] The utility model belongs to the field of current-carrying friction experimental devices, in particular to a testing device for a four-ball experimental machine used for current-carrying friction. Background Art

[0002] Current-carrying friction and wear are widely present in modern railway transportation systems, power generation systems, aerospace, electromagnetic railguns, and other fields. Numerous studies have confirmed that contact load and current affect the contact interface of the friction pair, thereby affecting the tribological behavior of the friction pair.

[0003] Among them, the four-ball tribometer is the most common friction testing device. It uses sliding friction to assess the load-carrying capacity of lubricants, including tests such as the maximum no-seizure load (PB), using the contact pressure of a steel ball on its rotating column and three steel balls attached to the oil cup. However, because the four-ball tribometer is made of metal and lacks dedicated power and insulation equipment, it cannot provide a constant voltage / current to the sample under test. Existing devices cannot meet the requirements of current-carrying tribology testing.

[0004] Based on this, the utility model designs a testing device for a four-ball testing machine for current-carrying friction to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings of the existing four-ball testing machine and provide a testing device for the four-ball testing machine for current-carrying friction, so as to solve the problem that the existing device is not equipped with dedicated power supply and insulation equipment and cannot provide a constant voltage / current for the sample to be tested.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A testing device for a four-ball testing machine for current-carrying friction, the four-ball testing machine comprising a lifting platform and a rotating motor arranged above the lifting platform, characterized in that the testing device comprises: a sample cup and a clamp;

[0008] The sample cup is placed on a lifting platform and comprises: an insulating cup body, a pressing ring, a screw cover and a current generator;

[0009] The upper end surface of the insulating cup body is provided with a cylindrical groove, the inner wall of the cylindrical groove is covered with metal material, a metal pad is provided on the bottom surface, and three small balls for the experiment are placed in the cylindrical groove;

[0010] The metal pad is connected to a current generator disposed in the insulating cup body, and the current generated by the current generator fills the columnar groove;

[0011] The clamping ring is placed at the upper end of the cylindrical groove, and its lower end surface abuts against the ball;

[0012] The screw cover is threadedly connected to the upper end of the insulating cup body, and the upper end surface of the clamping ring abuts against the lower surface of the screw cover;

[0013] The upper end of the fixture is provided with an insulating sleeve, the upper end of the fixture is connected to a rotating motor, the lower end of the fixture clamps a small ball, the sample cup is raised by a lifting platform, and the lower end of the fixture passes through the screw cover and the clamping ring and extends into the columnar groove for experiment.

[0014] Furthermore, the current generator includes: an adjustable voltage-stabilized power supply device and a conductive bolt;

[0015] The adjustable voltage-stabilized power supply device is arranged in the insulating cup;

[0016] The conductive bolt is embedded under the columnar groove, one end of the conductive bolt is connected to the adjustable voltage-stabilized power supply device, and the other end is connected to the metal pad in the columnar groove.

[0017] Furthermore, the outer wall of the screw cover is connected to a handle.

[0018] Furthermore, the clamp includes: a clamp fixing portion connected to the rotating motor and a spherical clamping portion fixed on the clamp fixing portion.

[0019] Furthermore, a hemispherical groove is formed on the lower end surface of the ball clamping portion, and a plurality of cuts are evenly formed on the outer wall of the hemispherical groove;

[0020] The clamp fixing portion is fixed to the upper end surface of the ball clamping portion, and a through needle-shaped opening is opened in the clamp fixing portion, one end of which is connected to the hemispherical groove. The needle-shaped instrument passes through the needle-shaped opening to push the ball in the hemispherical groove to remove the ball;

[0021] The insulating sleeve wraps the outer wall of the fixture fixing portion;

[0022] The fixture fixing portion is provided with a pin hole for being fixedly connected to the pin hole on the rotating motor through a pin.

[0023] Furthermore, a digital display screen and a voltage knob are provided on the outer wall of the insulating cup body, which are used to adjust the voltage of the current generator and display it on the digital display screen.

[0024] Furthermore, the insulating cup body is made of plastic or ceramic material; the insulating sleeve is made of plastic material.

[0025] Furthermore, the insulating cup body is made of zirconia ceramics.

[0026] Beneficial effects:

[0027] The utility model provides a testing device for a four-ball testing machine for current-carrying friction, which solves the problem that the existing device is not equipped with dedicated power supply and insulation equipment and cannot provide constant voltage / current for the sample to be tested. At the same time, it protects the operating safety of the experimenter and improves the stability of the experimental data. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of a testing device according to an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the specific structure of a sample cup according to an embodiment of the present utility model;

[0030] Figure 3 This is a schematic diagram of the specific structure of a clamp according to an embodiment of the present utility model;

[0031] In the figure: 1. Screw cover; 2. Clamping ring; 3. Columnar groove; 4. Insulating cup; 5. Conductive bolt; 6. Adjustable voltage-stabilized power supply; 7. Digital display; 8. Voltage knob; 9. Insulating sleeve; 10. Needle-shaped opening; 11. Pin hole; 12. Fixing part of the fixture; 13. Hemispherical groove; 14. Ball clamping part; 15. Incision. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] Rather, the present invention encompasses any alternatives, modifications, equivalents, and solutions within the spirit and scope of the present invention as defined by the claims. Furthermore, to facilitate a better understanding of the present invention, certain specific details are detailed below in the detailed description of the present invention. Those skilled in the art will be able to fully understand the present invention without these details.

[0034] According to a specific example of the present invention, a testing device for a four-ball tester for current-carrying friction is provided. The four-ball tester includes a lifting platform and a rotating motor arranged above the lifting platform, and the testing device includes: a sample cup and a clamp; the sample cup is placed on the lifting platform, and includes: an insulating cup body 4, a small ball pressing part and a current generator; a columnar groove 3 is opened on the upper end surface of the insulating cup body 4, the inner wall of the columnar groove 3 is covered with metal material, a metal pad is provided on the bottom surface, and three small balls for the experiment are placed in the columnar groove 3; the metal pad is connected to the current generator arranged in the insulating cup body 4, and the current generated by the current generator fills the columnar groove 3; an insulating sleeve 9 is provided at the upper end of the clamp, the upper end of the clamp is connected to the rotating motor, and the lower end of the clamp clamps a small ball; the small ball pressing part is provided at the upper end of the columnar groove 3, and the lower end of the small ball pressing part abuts the small ball; an opening is passed through the small ball pressing part for the lower end of the clamp to extend into the columnar groove 3.

[0035] Example:

[0036] In this embodiment, the four-ball testing machine includes a lifting platform and a rotating motor arranged above the lifting platform. Figure 1 and Figure 2 The lower left part of the sample cup in the figure shows the overall appearance, and the other parts show the internal diagram, such as Figure 1 , a testing device for a four-ball testing machine for current-carrying friction, comprising: a sample cup placed on a lifting platform and a fixture provided on a rotating motor just above the lifting platform;

[0037] The sample cup comprises: an insulating cup body 4, a pressing ring 2, a screw cover 1 and a current generator;

[0038] The upper end surface of the insulating cup body 4 is provided with a cylindrical groove 3, the inner wall of the cylindrical groove 3 is covered with metal material, and a metal pad is provided on the bottom surface. Three small balls for the experiment are placed in the cylindrical groove 3;

[0039] The metal pad is connected to a current generator disposed in the insulating cup 4, and the current generated by the current generator fills the columnar groove;

[0040] The clamping ring 2 is placed on the upper end of the cylindrical groove 3, and its lower end surface abuts against three steel balls used in the four-ball friction test;

[0041] The screw cap 1 is threadedly connected to the side wall of the upper end of the insulating cup body 4, and the upper end surface of the clamping ring 2 abuts against the lower surface of the screw cap 1, thereby compressing the three steel balls used in the four-ball friction test;

[0042] The upper end of the clamp is provided with an insulating sleeve 9, the upper end of the clamp is connected to the rotating motor, and the lower end of the clamp clamps a sphere, namely the upper ball. The sample cup is raised by the lifting platform, so that the end of the clamp holding the upper ball passes through the screw cover 1 and the clamping ring 2 and extends into the cylindrical groove 3 for experiment.

[0043] like Figure 2 , the current generator includes: an adjustable voltage-stabilized power supply device 6 and a conductive bolt 5;

[0044] The adjustable voltage-stabilized power supply device 6 is disposed within the insulating cup body 4, specifically within the cavity below the insulating cup body 4. In this embodiment, the adjustable voltage-stabilized power supply device 6 specifically includes a voltage transformation circuit, a rectifier and filter circuit, an adjustable voltage-stabilizing circuit, a digital display circuit, and other structures. The adjustable voltage-stabilized power supply device 6 can output an adjustable voltage of 0-30V;

[0045] The conductive bolt 5 is embedded below the cylindrical groove 3, connecting the cavity below the insulating cup 4 and the cylindrical groove 3. One end is connected to the adjustable voltage-stabilized power supply 6, and the other end is connected to the metal pad inside the cylindrical groove 3. In this way, the current generated by the adjustable voltage-stabilized power supply 6 can be conducted through the conductive bolt 5 to the metal ball pad, thereby conducting current throughout the bottom surface and side walls of the cylindrical groove 3. A grip is connected to the outer wall of the screw cap 1 to facilitate tightening the screw cap 1.

[0046] like Figure 2 A digital display screen 7 and a voltage knob 8 are provided on the outer wall of the insulating cup body 4 , which are used to adjust the current generator voltage and display it on the digital display screen 7 .

[0047] In addition, the insulating cup body 4 is made of zirconia ceramics; and the insulating sleeve 9 is made of plastic material.

[0048] like Figure 3 The clamp includes: a clamp fixing portion 12 connected to the rotating motor and a spherical clamping portion 14 fixed on the clamp fixing portion 12, a hemispherical groove 13 is opened on the lower end surface of the spherical clamping portion 14, and a plurality of cuts 15 are evenly opened on the outer wall of the hemispherical groove 13;

[0049] The clamp fixing part 12 is fixed on the upper end surface of the sphere clamping part 14, and a through needle-shaped opening 10 is opened in the clamp fixing part 12. One end of the needle-shaped opening 10 is connected to the hemispherical groove 13. A needle-shaped instrument passes through the needle-shaped opening 10 to push the sphere in the hemispherical groove 13 to remove the sphere; the insulating sleeve 9 wraps the outer wall of the clamp fixing part 12; the clamp fixing part 12 is provided with a pin hole 11, which is used to be fixedly connected to the pin hole on the rotating motor through a pin, and the pin is an insulating material.

[0050] Working principle: Place three steel balls for four-ball friction experiments into the cylindrical groove 3. After using the clamping ring 2 to compress the balls, tighten the screw cap 1 along the thread. Inject the sample to be tested into the cylindrical groove 3 so that it does not exceed the three experimental steel balls.

[0051] The upper ball is clamped into the hemispherical groove 13 of the clamp, and the clamp is fixed to the upper rotating motor through the pin hole 11 using a pin.

[0052] Place the sample cup on the lifting platform, and power on the adjustable voltage-stabilized power supply device 6. Adjust the voltage knob 8 until the voltage value displayed on the digital display screen 7 meets the experimental requirements, and then start the experiment.

[0053] After the experiment is complete, turn off the adjustable voltage-stabilized power supply 6, hold the sample cup by its insulating wall 6, and remove it from the lab bench. Remove the pin 10, remove the fixture, and use a needle-like instrument through the needle-like opening 10 to push the upper ball, thereby removing the upper ball. The experiment is complete.

Claims

1. A testing device for a four-ball testing machine for current-carrying friction, the four-ball testing machine comprising a lifting platform and a rotating motor arranged above the lifting platform, characterized in that: The testing device includes: a sample cup and a fixture; The sample cup is placed on a lifting platform and comprises: an insulating cup body (4), a small ball pressing portion and a current generator; The upper end surface of the insulating cup body (4) is provided with a columnar groove (3), the inner wall of the columnar groove (3) is covered with a metal material, a metal pad is provided on the bottom surface, and three small balls for the experiment are placed in the columnar groove (3); The metal pad is connected to a current generator arranged in the insulating cup body (4), and the current generated by the current generator fills the columnar groove (3); The upper end of the clamp is provided with an insulating sleeve (9), the upper end of the clamp is connected to the rotating motor, and the lower end of the clamp clamps a small ball; The ball pressing portion is arranged at the upper end of the columnar groove (3), and the lower end of the ball pressing portion abuts against the ball; The ball pressing portion is penetrated by an opening for the lower end of the clamp to extend into the columnar groove (3).

2. The testing device according to claim 1, wherein: The ball pressing portion comprises: a pressing ring (2) and a screw cover (1); The clamping ring (2) is placed at the upper end of the columnar groove (3), and its lower end surface abuts against the ball; The screw cover (1) is threadedly connected to the upper end of the insulating cup body (4), and the upper end surface of the clamping ring (2) abuts against the lower surface of the screw cover (1); The sample cup is raised by the lifting platform, so that the lower end of the clamp passes through the screw cover (1) and the pressing ring (2) and extends into the columnar groove (3) to carry out the experiment.

3. The testing device according to claim 2, characterized in that The outer wall of the screw cover (1) is connected to a grip rod.

4. The testing device according to claim 1, wherein: The current generator comprises: an adjustable voltage-stabilized power supply device (6) and a conductive bolt (5); The adjustable voltage-stabilized power supply device (6) is arranged in the insulating cup body (4); The conductive bolt (5) is embedded below the columnar groove (3), one end of which is connected to the adjustable voltage-stabilized power supply device (6), and the other end of which is connected to the metal pad in the columnar groove (3).

5. The testing device according to claim 1, wherein: The clamp comprises: a clamp fixing portion (12) connected to the rotating motor and a spherical clamping portion (14) fixed on the clamp fixing portion (12).

6. The testing device according to claim 5, characterized in that: A hemispherical groove (13) is formed on the lower end surface of the ball clamping portion (14), and a plurality of cuts (15) are evenly formed on the outer wall of the hemispherical groove (13); The clamp fixing portion (12) is fixed to the upper end surface of the ball clamping portion (14), and a through needle-shaped opening (10) is opened in the clamp fixing portion (12). One end of the needle-shaped opening (10) is connected to the hemispherical groove (13). A needle-shaped instrument passes through the needle-shaped opening (10) to push the ball in the hemispherical groove (13) to remove the ball; The insulating sleeve (9) wraps the outer wall of the clamp fixing portion (12); The clamp fixing portion (12) is provided with a pin hole (11) for being fixedly connected to the pin hole on the rotating motor via a pin.

7. The testing device according to claim 1, characterized in that A digital display screen (7) and a voltage knob (8) are provided on the outer wall of the insulating cup body (4) for adjusting the voltage of the current generator and displaying the voltage on the digital display screen (7).

8. The testing device according to claim 1, wherein: The insulating cup body (4) is made of plastic or ceramic material; The insulating sleeve (9) is made of plastic material.

9. The testing device according to claim 8, characterized in that: The insulating cup body (4) is made of zirconium oxide ceramics.

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