Lubricating grease shearing and separating device

Abstract

The utility model discloses a lubricating grease shearing and separating device which comprises a water bath box, an oil separating motor, a shearing mechanism and a grease sample cup, the grease sample cup is provided with a cup cover, a closed testing room is arranged in the water bath box, the shearing mechanism comprises a shearing shaft and shearing blades, and the shearing blades are annularly and uniformly distributed at the tail end of the shearing shaft and located in the grease sample cup; the shearing blade comprises a blade front plate and a blade rear plate, a paper containing groove is formed in the blade front plate, oil seepage holes are distributed in the bottom of the paper containing groove, test paper is laid in the paper containing groove, and the blade rear plate is used for press fitting of the test paper. The oil separation device applies shearing force and oil separation pressure through rotation of the shearing blades, simulates the actual working condition of lubricating grease in the using process to carry out oil separation capacity testing, guarantees the accuracy and reliability of testing, truly reflects the actual working performance of the lubricating grease, can restore the working environment of the lubricating grease in multiple angles in the testing process, and improves the working efficiency of the lubricating grease. Error introduction in testing is avoided, testing precision and completeness are guaranteed, and representative oil separation performance result data are obtained.

Description

Technical Field

[0001] The utility model relates to the technical field of lipid material performance detection, in particular to a lubricating grease shearing and oil separation device. Background Art

[0002] In the existing standard test methods, the technologies for testing the oil separation ability of grease mainly include pressure oil separation, centrifugal oil separation and screen oil separation. Pressure oil separation refers to the amount of base oil that grease separates under a certain pressure and time at room temperature. Determining the pressure oil separation rate of grease can predict the oil seepage and oil separation trends of grease under pressure conditions, and is used to simulate the oil separation state of grease when stored in barrels. Steel mesh oil separation refers to the tendency of grease to separate base oil under heating conditions. Determining the steel mesh oil separation rate of grease can predict the change state of the skeletal structure of grease under heating conditions, and its numerical value can be used to roughly judge the temperature range and duration of grease use. Centrifugal oil separation is a method for measuring the amount of oil separated by grease. It is suitable for measuring the oil separation tendency of grease under strong centrifugal force conditions and is an indicator of the colloid stability of grease.

[0003] Pressure oil separation and screen oil separation are static oil separation tests, mainly used to consider the colloidal storage stability of grease, and the external conditions are pressure and temperature. Centrifugal oil separation can examine the oil separation rate of grease at a set temperature and speed. This method is similar to the dynamic oil separation of grease in rolling bearings, but it is also a semi-static oil separation test. Because the grease is subjected to shearing between the rolling elements and the inner and outer raceways, and between the rolling elements and the cage and other relatively moving parts during operation.

[0004] When mechanical friction pairs are lubricated with grease, the grease separation during the working process is completed under complex working conditions, which mainly include the effects of multiple factors such as pressure, shear force, centrifugal force and temperature. However, the existing grease oil separation ability test technology only targets a single or partial factor and cannot fully simulate the actual working conditions of the grease during use to test the oil separation ability. It is urgent to develop a grease oil separation test technology that can comprehensively consider the effects of various factors to meet market demand. Utility Model Content

[0005] The purpose of the utility model is to overcome the defects of the prior art and provide a grease shearing and oil separation device to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the technical solution of the utility model is as follows:

[0007] A grease shearing and oil separation device comprises a water bath, an oil separation motor, a shearing mechanism and a grease sample cup. The grease sample cup is filled with grease and sealed by a cup cover. The internal space of the water bath is a closed test room. A positioning groove is arranged at the bottom of the test room. The grease sample cup is placed in the positioning groove of the water bath. Warm water is filled in the test room. The oil separation motor is installed on the top of the water bath. The shearing mechanism is arranged in the water bath and is located directly above the positioning groove. The shearing mechanism comprises a shearing shaft and a shearing blade. There are N shearing blades, N is greater than 1, and the N shearing blades are evenly distributed in an annular manner at the end of the shearing shaft and are located in the grease sample cup. The shearing shaft passes through the cup cover and rotates synchronously with the oil separation motor. The shearing blade comprises a blade front plate and a blade rear plate. The blade front plate is located at the lower end and is provided with a paper loading groove. The bottom of the paper loading groove is evenly distributed with a number of oil seepage holes. A number of test papers are laid in the paper loading groove. The positioning end of the lower end of the blade rear plate extends into the paper loading groove and is fixed with the blade front plate screw for pressing the test paper.

[0008] Preferably, the shear blade is arranged obliquely, and an inclination angle between the shear blade and the horizontal plane is greater than 0° and less than 75°.

[0009] More preferably, a positioning strip is provided at the bottom of the positioning groove, and an anti-rotation groove is provided at the bottom of the fat sample cup, and the positioning strip is inserted into the anti-rotation groove to prevent the fat sample cup from rotating during shearing and oil separation.

[0010] Further preferably, it also includes an intermediate transmission shaft, which is installed in the water bath through a supporting beam, with its upper end connected to the oil separation motor and its lower end detachably connected to the shear shaft through a coupling.

[0011] Further preferably, the coupling is a torque sensor coupling coupled with a torque sensor.

[0012] Further preferably, the water bath is provided with a door, which is directly opposite to the coupling position, and the lower edge of the door should be higher than the maximum water filling line in the test room.

[0013] Further preferably, the oil seepage hole is a trumpet-shaped oil hole whose diameter decreases in a curve from outside to inside, whose small end is located at the bottom of the paper loading slot, and whose large end is located on the lower plane of the blade front plate.

[0014] Further preferably, a water heater and a water temperature sensor are provided at the bottom of the test room, the water heater is connected to the water temperature sensor, and the insulation temperature can be preset.

[0015] Compared with the prior art, the grease shearing and oil separation device of the utility model has the following beneficial effects:

[0016] The oil separation device applies shear force and oil separation pressure through the rotation of shear blades, simulates the actual working conditions of grease during use to test the oil separation ability, ensures the accuracy and reliability of the test, truly reflects the actual operating performance of the grease, and overcomes the defects of the oil separation test in the prior art; the device has a simple structure and is easy to implement the test, and can be promoted as a laboratory test equipment; a suitable shear oil separation test method is designed for the oil separation device, which restores the grease working environment from multiple angles and avoids the introduction of errors in the test process as much as possible, ensuring the test accuracy and completeness, so as to obtain representative oil separation performance result data. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of the oil separation device of the utility model;

[0018] Figure 2 for Figure 1 Structural diagram of the middle shear mechanism;

[0019] Figure 3 for Figure 2 Top view of the middle shear blade;

[0020] Figure 4 for Figure 3 Middle AA section cutaway view;

[0021] Figure 5 for Figure 3 Cross-sectional view of the middle BB section.

[0022] In the figure: 1. oil separation motor; 2. motor base; 3. water bath; 31. positioning slot; 4. supporting beam; 5. intermediate transmission shaft; 6. coupling; 7. shearing mechanism; 71. shearing shaft; 72. shearing blade; 721. blade front plate; 721a. oil seepage hole; 721b. paper loading slot; 722. blade rear plate; 723. test paper; 73. blade mounting seat; 8. fat sample cup; 81. cup cover. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only the best embodiments of the utility model, not all embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In view of the defects of the prior art in the testing technology of the oil separation ability of lubricating grease, this embodiment designs a lubricating grease shear oil separation device, which can simulate the pressure and shear force of lubricating grease under the actual working state, and fill the blank of the shear oil separation testing device;

[0025] Specifically, Figure 1-Figure 5 As shown, the grease shearing and oil separation device comprises a water bath 3, an oil separation motor 1, a shearing mechanism 7 and a grease sample cup 8. The grease sample cup 8 is used to fill the grease and is provided with a cup cover 81 that can be screwed and tightened. The pressure oil separation test cup in the prior art has no cup bottom, or an oil hole is provided at the cup bottom. The grease sample cup 8 in this embodiment is different from the pressure oil separation test cup. After the cup cover 81 is screwed, the grease is contained in the closed grease sample cup 8.

[0026] like Figure 1 As shown, the water bath 3 is used to construct a test environment, and its internal space is a closed test room, and hot water is filled in the test room. Since there are requirements for the test water temperature change range, a water heater and a water temperature sensor are arranged at the bottom of the water bath 3. The water heater can preset the insulation temperature, and the water temperature sensor collects the hot water temperature and transmits it to the water heater to achieve automatic insulation; in addition, the water bath 3 is provided with a door and an observation window for the purpose of sample setting operation and process observation. The bottom of the door should be higher than the maximum water filling line, and the maximum water filling line should be lower than the mouth of the fat sample cup 8;

[0027] The shearing mechanism 7 is used to stir the grease to provide oil separation shearing force and oil separation pressure. It is arranged in the water bath 3 and includes a shearing shaft 71 and a shearing blade 72. When loading and placing samples, the fat sample cup 8 needs to be moved and opened. In order to facilitate the disassembly and assembly of the shearing mechanism 7, an intermediate transmission shaft 5 is provided to connect the oil separation motor 1. The oil separation motor 1 is invertedly arranged on the top of the water bath 3 through the motor seat 2. The intermediate transmission shaft 5 passes through the top plate of the water bath 3 and is connected to the oil separation motor 1 through the coupling 6. A supporting crossbeam 4 is provided, and an intermediate transmission shaft 5 can be rotatably installed on the supporting crossbeam 4 through a bearing. The lower end of the intermediate transmission shaft 5 is connected to the shearing mechanism 7 through a coupling 6 with a quick-install structure (not shown in the figure). The quick-install structure can adopt a flange joint, a clamp connection, an elastic clamp joint structure, etc. in the prior art. In order to facilitate the positioning of the fat sample cup 8, a positioning groove 31 coaxial with the bearing is provided at the bottom of the test room. The positioning groove 31 is adapted to the bottom of the fat sample cup 8, so that the fat sample cup 8 is located on the rotation center axis of the shear blade 72;

[0028] The number of shear blades 72 is N, N is greater than 1, and preferably 3 blades. Figure 2 As shown, N shear blades 72 are evenly distributed in an annular manner on a blade mounting seat 73 at the end of a shear shaft 71. During testing, the shear blades 72 are located in the grease sample cup 8 and immersed below the grease liquid level. The cup cover 81 is provided with a shear shaft 71 through hole;

[0029] The oil collection is completed by the shear blade 72. Figure 3-Figure 5As shown, the shear blade 72 includes a blade front plate 721 and a blade rear plate 722, which are used to clamp the test paper 723. The blade front plate 721 is used as a shear force application body, and its end is installed by bolts. The blade front plate 721 is provided with a paper loading groove 721b, and the paper loading groove 721b is used to load the test paper 723 with the same structure and size. The blade rear plate 722 is used to cover the paper loading groove 721b and press the test paper 723. Its lower end extends into the paper loading groove 721b to apply a pressing force and is fixed to the blade front plate 721 by screws; the lower end surface of the blade front plate 721 is used as a shear action surface for rotational motion, and its upper There are several oil seepage holes 721a evenly distributed, and the oil seepage holes 721a penetrate to the bottom of the paper loading groove 721b. The oil seepage holes 721a are trumpet-shaped oil holes with a diameter that decreases from the outside to the inside in a curved manner. The small port is located at the bottom of the paper loading groove 721b, and the large port is located on the lower plane of the blade front plate 721, and the large port is a rounded structure. The grease is guided to flow in through the oil seepage holes 721a on the shear action surface. At a certain temperature, the grease is continuously subjected to the shear force and pressure, and the oil seeps out, and under the guidance and absorption of the oil seepage holes 721a, it seeps into the paper loading groove 721b, and is absorbed and stored by the test paper 723, completing the collection of the shear oil separation test.

[0030] As a further technical solution, the shear blade 72 is tilted, that is, the shear blade 72 has an inclined installation angle greater than 0° and less than 75° with the horizontal plane. It is designed according to the grease loading amount to satisfy the shear blade 72 for the longitudinal and lateral pushing movement cycle of the grease. At the same time, the tilted shear blade 72 can generate shear force and longitudinal extrusion force during the rotation process to better reproduce the actual working environment.

[0031] As a further technical solution, the grease has a certain viscosity. In order to prevent the fat sample cup 8 from rotating during the test and causing invalid load, a raised positioning strip (not shown in the figure) is provided at the bottom of the positioning groove 31, and an anti-rotation groove (not shown in the figure) is provided at the bottom of the fat sample cup 8. When placed, the positioning strip is embedded in the anti-rotation groove to fix the fat sample cup 8.

[0032] As a further technical solution, in order to facilitate the collection of torque values, the coupling 6 adopts a torque sensor coupling 6 coupled with a torque sensor in the prior art, which can be connected to a test system to display a torque curve in real time. First, it is convenient to set a specified torque according to the actual working torque of the grease to observe the oil separation performance under a real environment; second, the oil separation performance of the grease at the peak torque value, that is, the maximum oil content, can be obtained through testing.

[0033] A shear oil separation test method for a grease shear oil separation device, based on the above grease shear oil separation device, comprises the following steps:

[0034] S1: Clean the residual fat liquid in the fat sample cup 8, the cup cover 81 and the shearing mechanism 7 with a solvent, and dry them for later use;

[0035] S2: Take 10N sheets of clean test paper 723 and weigh them. Test paper 723 is oil-absorbing filter paper. Weigh to 0.0002g to obtain the initial weight G0 of test paper 723. Test paper 723 should be cut into the shape of paper slot 721b. In addition, weigh the lipid sample cup 8 in S1 to 0.0002g to obtain the initial weight G1 of lipid sample cup 8.

[0036] S3, remove the blade rear plate 722 covering the paper loading slot 721b, first lay a piece of oil-impregnated filter paper at the bottom of each paper loading slot 721b, soak the oil-impregnated filter paper with lubricating oil in advance and absorb excess oil on both sides of the surface, then load the 10 neatly stacked test papers 723 in step S2, and finally cover the top test paper 723 with a piece of the same oil-impregnated filter paper, install the blade rear plate 722, and complete the clamping and positioning of the test paper 723 and the oil-impregnated filter paper;

[0037] S4. Load the grease sample into the grease sample cup 8 by scraping with a scraper. No bubbles or gaps are formed. The grease sample in the grease sample cup 8 occupies 1 / 2 to 2 / 3 of the cup volume. After the shear mechanism 7 is installed, the shear blades 72 are completely immersed below the grease liquid level. The grease sample cup 8 after loading is weighed to an accuracy of 0.0002 g to obtain the gross weight G2 of the grease sample cup 8.

[0038] S5, put the cup cover 81 on the shear shaft 71, and screw the cup cover 81 with the shear mechanism 7 and the fat sample cup 8 together and tighten them, place the fat sample cup 8 in the positioning groove 31 and perform anti-rotation positioning, and quickly install the shear shaft 71 on the fat sample cup 8 at the end of the intermediate transmission shaft 5 through the quick-release coupling 6;

[0039] S6. Set up a constant temperature water bath in the test room to simulate the working environment temperature. Inject warm water into the water bath 3, which should not exceed the maximum water filling line. The water bath temperature is 30-100°C. The temperature should be kept within the range of ±1°C during the entire test. Keep the temperature constant for 30 minutes to complete the test preparation.

[0040] S7, start the measurement, first set the motor speed, the speed of the oil separator motor 1 should be less than 2000rpm, and its error during the test should not exceed 10%, start the oil separator motor 1, and monitor the shear torque;

[0041] S8. According to the test design purpose, if it is an oil distribution test under rated torque, when the shear torque reaches the specified torque and enters a stable state, start the timing, continue for 4h-8h, and stop the test; if it is a test of the absolute oil content of grease, gradually increase the speed until the shear torque reaches a relatively stable state, start the timing, and stop the test after 4h-8h;

[0042] S9, disassemble the shear mechanism 7 and the blade rear plate 722, take out the test paper 723 and the oil-impregnated filter paper in each paper slot 721b, because the bottom layer of the oil-impregnated filter paper is in contact with the grease, and the upper layer of the oil-impregnated filter paper is in contact with the blade rear plate 722, errors will be introduced, which are not included in the final weight collection, and only the 10N test papers 723 in the middle are weighed, accurate to 0.0002g, to obtain the gross weight G3;

[0043] S10, the net weight of the oil is G3-G0, the net weight of the grease sample is G2-G1, and the oil content of the grease sample is calculated according to the formula X(%)=100%*(G3-G0) / (G2-G1);

[0044] S11. Repeat the test according to steps S1-S10, and take the arithmetic mean of the two repeated test results as the test result of the oil content of the grease sample, and the difference between the two repeated test results and the arithmetic mean should not exceed ±5% of the arithmetic mean.

[0045] The directional words "inside", "outside", "upper", "lower", "bottom", "end" and so on mentioned in this article are based on Figure 1-Figure 5 The coordinates or orientations shown in . These terms are mainly used to better describe the utility model and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation;

[0046] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the terms "on" and "inside" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this utility model can be understood according to specific circumstances.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A grease shearing and oil separation device, characterized in that: It includes a water bath, an oil separation motor, a shearing mechanism and a fat sample cup. The fat sample cup is filled with grease and sealed by a cup cover. The internal space of the water bath is a closed test room. A positioning groove is provided at the bottom of the test room. The fat sample cup is placed in the positioning groove. The test room is filled with warm water. The oil separation motor is installed on the top of the water bath. The shearing mechanism is provided in the water bath and is located directly above the positioning groove. The shearing mechanism includes a shearing shaft and a shearing blade. The number of the shearing blades is N, where N is greater than 1. The N shearing blades are evenly distributed in an annular manner at the end of the shearing shaft and are located in the fat sample cup. The shearing shaft passes through the cup cover and rotates synchronously with the oil separation motor. The shearing blade includes a blade front plate and a blade rear plate. The blade front plate is located at the lower end and is provided with a paper loading groove. The bottom of the paper loading groove is evenly distributed with a number of oil seepage holes. A number of test papers are laid in the paper loading groove. The positioning end of the lower end of the blade rear plate extends into the paper loading groove and is fixed to the blade front plate with screws for press-fitting the test paper.

2. The grease shearing and oil separation device according to claim 1, characterized in that: The shear blade is arranged obliquely, and an inclination angle between the shear blade and a horizontal plane is greater than 0° and less than 75°.

3. The grease shearing and oil separation device according to claim 1, characterized in that: A positioning strip is provided at the bottom of the positioning groove, and an anti-rotation groove is provided at the bottom of the fat sample cup. The positioning strip is inserted into the anti-rotation groove to prevent the fat sample cup from synchronously rotating during the shear oil separation test.

4. The grease shearing and oil separation device according to claim 1, characterized in that: It also includes an intermediate transmission shaft, which is installed in the water bath tank through a supporting crossbeam, with its upper end connected to the oil separation motor and its lower end detachably connected to the shear shaft through a coupling.

5. The grease shearing and oil separation device according to claim 4, characterized in that: The coupling is a torque sensor coupling coupled with a torque sensor.

6. The grease shearing and oil separation device according to claim 5, characterized in that: The water bath is provided with a door facing the coupling position, and the lower edge of the door should be higher than the maximum water filling line in the test room.

7. The grease shearing and oil separation device according to claim 1, characterized in that: The oil seepage hole is a trumpet-shaped oil hole whose diameter decreases in a curve from outside to inside, whose small end is located at the bottom of the paper loading slot, and whose large end is located on the lower plane of the blade front plate.

8. The grease shearing and oil separation device according to claim 1, characterized in that: A water heater and a water temperature sensor are arranged at the bottom of the test room. The water heater is connected to the water temperature sensor and can preset a heat preservation temperature.

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