A heating oil cup of a four-ball friction tester

Abstract

The utility model relates to four ball friction testing machine oil cup accessory field discloses a heating oil cup of four ball friction testing machine, including oil cup body, the inside of oil cup body is provided with auxiliary groove, the inside fixedly connected with motor of auxiliary groove, the upper portion fixedly connected with magnetic force rotating block of motor's working shaft, the inside of oil cup body is provided with magnetic block groove, magnetic force rotating block and magnetic block groove swing joint, the upper portion magnetic absorption of magnetic force rotating block has magnetic son, the inside of oil cup body is provided with limit groove. In the utility model, set up magnetic son, magnetic force rotating block etc. component, the oil liquid in the cup is forced circulation by initiative stirring, thoroughly eliminates the thermal stratification phenomenon, ensures the whole oil bath temperature height consistency from the cup wall to the friction pair contact point, significantly improves the accuracy and repeatability of high temperature test data, and makes the test condition more close to the real working condition that the oil liquid in gear box, compressor etc. equipment is stirred, and the test result has the engineering guiding significance more.

Description

Technical Field

[0001] This utility model relates to the field of oil cup accessories for four-ball friction testing machines, and in particular to a heating oil cup for a four-ball friction testing machine. Background Technology

[0002] The four-ball friction testing machine is a key piece of equipment for evaluating the extreme pressure anti-wear performance and tribological properties of lubricating oils and greases. Its working principle involves fixing three steel balls in an oil cup and immersing them in the lubricant to be tested. A third steel ball, driven by the spindle, forms point contact with the three balls below, and a friction test is conducted under set load, speed, and temperature.

[0003] Currently, common four-ball testing machine oil cups, when simulating high-temperature conditions, often use a method of wrapping heating tape or installing a heating jacket around the outside of the oil cup. This external heating method has low thermal efficiency, slow temperature rise, high energy consumption, and high cup wall temperature while the temperature of the central friction pair area is low, resulting in uneven oil bath temperature, which seriously affects the repeatability and accuracy of test results. In addition, static oil cannot truly reflect the dynamic performance of lubricating oil under actual working conditions, and the wear debris generated during the test is prone to deposit in the ball groove, which may interfere with the normal contact of the friction pair, making it unsuitable for use. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a heating oil cup for a four-ball friction testing machine, which aims to improve the problem of "uneven heating effect" in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a heating oil cup for a four-ball friction testing machine, comprising an oil cup body, an auxiliary groove inside the oil cup body, a motor fixedly connected inside the auxiliary groove, a magnetic rotating block fixedly connected to the upper part of the working shaft of the motor, a magnetic block groove inside the oil cup body, the magnetic rotating block being movably connected to the magnetic block groove, a magnetic element magnetically attracted to the upper part of the magnetic rotating block, a limiting groove inside the oil cup body, the magnetic element being rotatably connected to the limiting groove, and a wire groove inside the oil cup body.

[0006] As a further description of the above technical solution: The bottom of the inner wall of the oil cup body is arc-shaped, and three steel balls are movably connected to the bottom of the inner wall of the oil cup body. An installation groove is opened on the upper part of the oil cup body, and a heating coil and a heat transfer plate are fixedly connected inside the installation groove. The inner wall of the heating coil is fixedly connected to the heat transfer plate.

[0007] As a further description of the above technical solution: The inner wall of the oil cup is movably connected to a retaining ring, and the inner wall of the retaining ring is movably connected to the outer wall of three steel balls.

[0008] As a further description of the above technical solution: The upper part of the retaining ring has a first sealing groove, and the upper part of the inner wall of the oil cup body is threaded with a screw cap. The lower part of the screw cap abuts against the retaining ring, and the lower part of the screw cap has a second sealing groove. The second sealing groove and the first sealing groove are movably connected to a rubber ring.

[0009] As a further description of the above technical solution: A temperature control component is provided on the outside of the screw cap. The temperature control component includes a heat insulation layer, and the inner wall of the heat insulation layer is movably connected to the outer wall of the oil cup body.

[0010] As a further description of the above technical solution: The outer wall of the insulation layer is fixedly connected to a fixed outer ring, and the outer wall of the fixed outer ring is fixedly connected to two sets of clamping blocks. The clamping blocks are threaded through and threaded with bolts, and the right side of the bolts is threaded with nuts.

[0011] As a further description of the above technical solution: A handle is fixedly connected to the rear side of the fixed outer ring.

[0012] This utility model has the following beneficial effects: 1. In this utility model, components such as magnetic particles and magnetic rotating blocks are provided to actively stir and force the oil in the cup to circulate, which completely eliminates the thermal stratification phenomenon and ensures that the temperature of the entire oil bath from the cup wall to the contact point of the friction pair is highly consistent. This significantly improves the accuracy and repeatability of high-temperature test data and makes the test conditions closer to the real working state of oil being stirred in equipment such as gearboxes and compressors. The test results are more meaningful for engineering guidance.

[0013] 2. In this utility model, the heating wire is built in and wrapped with an external insulation layer. The built-in heating wire can heat the lubricating oil faster, which greatly shortens the test preparation time. The insulation layer effectively suppresses heat loss caused by thermal radiation and convection. Due to the high thermal efficiency, the heater itself does not need to be in an ultra-high power state for a long time, and the working load is more gradual, which helps to extend its service life. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the heating oil cup of a four-ball friction testing machine proposed in this utility model; Figure 2 This is a schematic diagram of the overall disassembled upper three-dimensional structure of the heating oil cup of a four-ball friction testing machine proposed in this utility model. Figure 3 This is a schematic diagram of the overall disassembled lower three-dimensional structure of the heating oil cup of a four-ball friction testing machine proposed in this utility model. Figure 4This is a cross-sectional three-dimensional structural diagram of the heating oil cup body and rubber ring of a four-ball friction testing machine proposed in this utility model.

[0015] Legend: 1. Oil cup body; 2. Temperature control component; 3. Screw cap; 4. Motor; 5. Rubber ring; 6. Steel ball; 7. Magnetic element; 8. Magnetic rotating block; 9. Snap ring; 11. Auxiliary groove; 12. Wire groove; 13. No. 1 sealing groove; 14. Mounting groove; 15. Magnetic block groove; 16. Limiting groove; 21. Insulation layer; 22. Fixing outer ring; 23. Handle; 24. Clamping block; 25. Nut; 26. Heat transfer plate; 27. Heating coil; 28. Bolt; 31. No. 2 sealing groove. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Reference Figure 1 and Figure 4This utility model provides an embodiment of a heating oil cup for a four-ball friction testing machine, comprising an oil cup body 1, which holds test lubricating oil. An auxiliary groove 11 is provided inside the oil cup body 1, which houses an auxiliary motor 4. The motor 4 is fixedly connected inside the auxiliary groove 11, and can drive a magnetic rotating block 8 to rotate, providing power for magnetic stirring. A magnetic rotating block 8 is fixedly connected to the upper part of the working shaft of the motor 4. The magnetic rotating block 8 attracts a magnetic particle 7 through magnetic force, relying on its own... The rotation of the body causes the magnet 7 to rotate. A magnetic block slot 15 is provided inside the oil cup body 1 to hold the magnetic rotating block 8, preventing the tested lubricating oil from entering the motor 4. The magnetic rotating block 8 is movably connected to the magnetic block slot 15. The magnet 7 is magnetically attracted to the upper part of the magnetic rotating block 8. The rotation of the magnet 7 forces the tested lubricating oil inside the oil cup body 1 to circulate. A limiting groove 16 is provided inside the oil cup body 1 to prevent the magnet 7 from rotating randomly inside the oil cup body 1. The magnet 7 is rotated in conjunction with the limiting groove 16. The magnetic particle 7 will not detach from the limiting groove 16. The oil cup body 1 has a wire groove 12 inside, which can hold the wires of the motor 4. The bottom of the inner wall of the oil cup body 1 is arc-shaped, and three steel balls 6 are movably connected to the bottom of the inner wall of the oil cup body 1. The steel balls 6 are components that constitute the core friction. The upper part of the oil cup body 1 has an installation groove 14, which is used to assist in the installation of the heating coil 27 and the heat transfer plate 26. The heating coil 27 and the heat transfer plate 26 are fixedly connected inside the installation groove 14. The heating coil 27 is spiral-shaped. The inner wall of the heating coil 27 is fixedly connected to the heat transfer plate 26. While the heat transfer plate 26 fixes the heating coil 27, it conducts the heat of the heating coil 27 to the inside of the oil cup body 1. The inner wall of the oil cup body 1 is movably connected with a retaining ring 9. The retaining ring 9 can hold three steel balls 6 and, together with the arc-shaped bottom, ensure that the three steel balls 6 are kept in the center position. The inner wall of the retaining ring 9 is movably connected to the outer wall of the three steel balls 6. The screw cap 3 is provided with a temperature control component 2 on the outside. The screw cap 3 can press against the retaining ring 9.

[0018] Reference Figure 2 - Figure 4The temperature control component 2 includes an insulation layer 21, which prevents excessive heat loss during heating. The inner wall of the insulation layer 21 is movably connected to the outer wall of the oil cup body 1. A first sealing groove 13 is formed on the upper part of the retaining ring 9. The first sealing groove 13 cooperates with the second sealing groove 31 to install a rubber ring 5. A screw cap 3 is threadedly connected to the upper part of the inner wall of the oil cup body 1. The lower part of the screw cap 3 abuts against the retaining ring 9 to prevent the retaining ring 9 from shaking in the oil cup body 1 and affecting the experiment. A second sealing groove 31 is formed on the lower part of the screw cap 3. The second sealing groove 31 and the first sealing groove 13 are movably connected to a rubber ring 5. The rubber ring 5 can prevent the lubricating oil to be tested from leaking out. The insulation layer 2... 1. A fixed outer ring 22 is fixedly connected to the outer wall. The fixed outer ring 22 can fix the oil cup body 1 to the insulation layer 21. Two sets of clamping blocks 24 are fixedly connected to the outer wall of the fixed outer ring 22. The clamping blocks 24 can quickly detach and install the insulation layer 21 and the fixed outer ring 22. The clamping blocks 24 are threaded through and connected to bolts 28. The bolts 28 and nuts 25 can reduce the gap between the clamping blocks 24 so that the fixed outer ring 22 can be fixed more tightly to the oil cup body 1. The bolts 28 are threaded to the right side and connected to nuts 25. A handle 23 is fixedly connected to the rear side of the fixed outer ring 22. The handle 23 assists the operator in placing the oil cup body 1 on the operating machine.

[0019] Working principle: The insulation layer 21 and the fixing outer ring 22 are fitted onto the outside of the oil cup body 1. The nut 25 is rotated so that each set of clamping blocks 24 moves closer to each other until the nut 25 can no longer be rotated. At this time, the fixing outer ring 22 is fixed to the oil cup body 1. Three steel balls 6 are placed inside the oil cup body 1, and then the retaining ring 9 is placed. The retaining ring 9 and the arc-shaped design of the bottom of the inner wall of the oil cup body 1 work together to form a precise geometric constraint, firmly restricting the three steel balls 6 to the center position, forming a standard three-point contact friction. For the first sealing groove 13, place the rubber ring 5 into the first sealing groove 13. Tighten the screw cap 3 so that its lower end face abuts against the retaining ring 9, pressing the retaining ring 9 to prevent it from shifting due to vibration. At the same time, compress the rubber ring 5 placed between the first sealing groove 13 and the second sealing groove 31 to form a reliable static seal. Pour in the lubricating oil to be tested until the lubricating oil level is flush with the upper surface of the retaining ring 9. The operator installs the oil cup onto the testing machine using the handle 23. After the motor 4 fixed in the auxiliary groove 11 is started, its working shaft drives the magnetic rotation. Block 8 rotates at high speed within the magnetic block slot 15. The magnetic block slot 15 physically isolates the magnetic block 8 from the lubricating oil inside the oil cup, achieving a dynamic seal and fundamentally preventing lubricating oil leakage to the motor 4. The rotating magnetic block 8 generates a rotating magnetic field, which penetrates the wall of the magnetic block slot 15 and acts on the magnet 7 inside the oil cup body 1. Through strong magnetic attraction, the rotational motion of the magnetic block 8 is transmitted to the magnet 7 without contact, driving the magnet 7 to rotate synchronously. The magnet 7 is stably positioned within the limiting slot 16. The fixed rotation and limiting groove 16 ensure that the movement trajectory of the magnet 7 is fixed and will not drift randomly in the oil. The rotating magnet 7 generates a strong shearing effect on the surrounding lubricating oil, forming forced convection. The heating coil 27 embedded in the mounting groove 14 generates Joule heat after being energized and directly transfers it to the heat transfer plate 26 that is tightly fixed thereto. The heat transfer plate 26, as a heat conduction medium, efficiently and evenly conducts the heat to the wall of the oil cup body 1, thereby heating the lubricating oil on the inside. The experiment can only be carried out when the temperature is heated to the specified temperature.

[0020] Working principle: The insulation layer 21 and the fixing outer ring 22 are fitted onto the outside of the oil cup body 1. The nut 25 is rotated so that each set of clamping blocks 24 approaches each other until the nut 25 can no longer be rotated. At this time, the fixing outer ring 22 is fixed together with the oil cup body 1. Three steel balls 6 are placed inside the oil cup body 1, and then the retaining ring 9 is placed. The retaining ring 9 and the arc-shaped design of the bottom of the inner wall of the oil cup body 1 work together to form a precise geometric constraint, which firmly restricts the three steel balls 6 in the center position, forming a standard three-point contact friction pair. The rubber ring 5 is placed in the first sealing groove 13. By tightening the screw cap 3, its lower end face abuts against the retaining ring 9, pressing the retaining ring 9 to prevent it from shifting due to vibration, while compressing the rubber ring 5 placed between the first sealing groove 13 and the second sealing groove 31, forming a reliable static seal. The lubricating oil to be tested is poured in until the lubricating oil level is flush with the upper surface of the retaining ring 9. The operator installs the oil cup onto the testing machine through the handle 23. After the motor 4 fixed in the auxiliary groove 11 is started... Its working shaft drives the magnetic rotating block 8 to rotate at high speed in the magnetic block groove 15. The magnetic block groove 15 physically isolates the magnetic rotating block 8 from the lubricating oil inside the oil cup, achieving dynamic sealing. The rotating magnetic rotating block 8 generates a rotating magnetic field. The magnetic field penetrates the wall of the magnetic block groove 15 and acts on the magnetic element 7 inside the oil cup body 1. Through strong magnetic attraction, the rotational motion of the magnetic rotating block 8 is transferred to the magnetic element 7 without contact, driving the magnetic element 7 to rotate synchronously. The magnetic element 7 rotates stably in the limiting groove 16. The limiting groove 16 ensures that the movement trajectory of the magnetic element 7 is fixed and will not drift disorderly in the oil. The rotating magnetic element 7 generates a strong shearing effect on the surrounding lubricating oil, forming forced convection. The heating coil 27 embedded in the mounting groove 14 generates Joule heat after being energized and directly transfers it to the heat transfer plate 26 that is tightly fixed thereto. The heat transfer plate 26, as a heat conduction medium, efficiently and evenly conducts the heat to the wall of the oil cup body 1, thereby heating the lubricating oil inside. The experiment can only be carried out when the temperature is heated to the specified temperature.

[0021] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A heating oil cup for a four-ball friction testing machine, comprising an oil cup body (1), characterized in that: An auxiliary groove (11) is provided inside the oil cup body (1). A motor (4) is fixedly connected inside the auxiliary groove (11). A magnetic rotating block (8) is fixedly connected to the upper part of the working shaft of the motor (4). A magnetic block groove (15) is provided inside the oil cup body (1). The magnetic rotating block (8) is movably connected to the magnetic block groove (15). A magnetic magnet (7) is magnetically attracted to the upper part of the magnetic rotating block (8). A limiting groove (16) is provided inside the oil cup body (1). The magnetic magnet (7) is rotatably connected to the limiting groove (16). A wire groove (12) is provided inside the oil cup body (1).

2. The heating oil cup of a four-ball friction testing machine according to claim 1, characterized in that: The bottom of the inner wall of the oil cup body (1) is arc-shaped. Three steel balls (6) are movably connected to the bottom of the inner wall of the oil cup body (1). An installation groove (14) is provided on the upper part of the oil cup body (1). A heating coil (27) and a heat transfer plate (26) are fixedly connected inside the installation groove (14). The inner wall of the heating coil (27) is fixedly connected to the heat transfer plate (26).

3. The heating oil cup of a four-ball friction testing machine according to claim 1, characterized in that: The inner wall of the oil cup body (1) is movably connected to a retaining ring (9), and the inner wall of the retaining ring (9) is movably connected to the outer wall of three steel balls (6).

4. The heating oil cup of a four-ball friction testing machine according to claim 3, characterized in that: The upper part of the retaining ring (9) has a first sealing groove (13), the upper part of the inner wall of the oil cup body (1) is threaded with a screw cap (3), the lower part of the screw cap (3) abuts against the retaining ring (9), the lower part of the screw cap (3) has a second sealing groove (31), and the second sealing groove (31) and the first sealing groove (13) are movably connected with a rubber ring (5).

5. The heating oil cup of a four-ball friction testing machine according to claim 4, characterized in that: The screw cap (3) is provided with a temperature control component (2) on the outside. The temperature control component (2) includes a heat insulation layer (21). The inner wall of the heat insulation layer (21) is movably connected to the outer wall of the oil cup body (1).

6. The heating oil cup of a four-ball friction testing machine according to claim 5, characterized in that: The outer wall of the insulation layer (21) is fixedly connected to a fixed outer ring (22), and the outer wall of the fixed outer ring (22) is fixedly connected to a clamping block (24) in two sets. The clamping block (24) is internally penetrated and threadedly connected to a bolt (28), and the right side of the bolt (28) is threadedly connected to a nut (25).

7. The heating oil cup of a four-ball friction testing machine according to claim 6, characterized in that: A handle (23) is fixedly connected to the rear side of the fixed outer ring (22).

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