Mixed grease used under extremely low temperature condition, and application, preparation and use method thereof

Abstract

The invention belongs to the technical field of miniature direct-current servo motors, and particularly relates to mixed grease used under an extremely low temperature condition, application, preparation and a using method. The mixed grease comprises low-temperature lubricating grease and instrument oil, the weight ratio of the low-temperature lubricating grease to the instrument oil is 1: (0.6-1.5), and the grease meets the normal use of the servo motor at-40 DEG C. The prepared mixed grease is subjected to the procedures of motor disassembly, gear grease cleaning, gear coating and matching of lubricating grease and motor assembly, motor magnetic ring assembly, motor inspection, motor low-temperature no-load test, motor low-temperature on-load test, motor diaphragm part assembly to a photoelectric observer and the like; the mixed grease disclosed by the invention is used on an imported micro direct-current servo motor for driving the diaphragm, so that the requirement of normal work in an environment of minus 40 DEG C is met.

Description

Technical Field

[0001] The invention belongs to the technical field of micro DC servo motors, and in particular relates to mixed grease used under extremely low temperature conditions, and its application, preparation and use methods. Background Art

[0002] The opening and closing process of the CCD field light bar of a certain photoelectric observer is driven and controlled by a micro DC servo motor. After the photoelectric observer is assembled and debugged, it should be able to work normally under the operating environment of -40℃. Since the micro motor is an imported industrial-grade micro DC servo motor with low starting voltage and high control accuracy, but the minimum operating temperature can only reach -10℃~-20℃, it cannot meet the working requirements of the whole machine under -40℃ environment. In order to solve this key technical problem, it is necessary to improve the low temperature adaptability of the micro DC servo motor. Summary of the invention

[0003] The invention provides mixed grease used under extremely low temperature conditions, and its application, preparation and use methods, so as to solve the problem that the motor cannot meet the normal working requirements under a -40°C environment.

[0004] To achieve the above object, the technical solution adopted by the present invention is: The mixed grease used under extremely low temperature conditions includes low temperature grease and instrument oil; the weight ratio of low temperature grease to instrument oil is 1:0.6~1.5. The grease can meet the normal use of servo motors at -40°.

[0005] The parameters of the low-temperature grease meet the following conditions: cone penetration of 1 / 4, 0.1mm: 74; dropping point, ℃: 234; evaporation rate 180℃, % m / m: 1.25; pressure oil separation, % m / m: 11.55; corrosion: copper sheet, 100℃, 3h; similar viscosity -60℃, 10s -1 , Pa·s: 283; the parameters of the instrument oil meet the following conditions: synthetic oil as the base oil, with antioxidants and rust inhibitors added; and in accordance with the specifications of MIL-L-6085A and DTD-822.

[0006] The method for preparing mixed grease for use under extremely low temperature conditions comprises the following steps: Step 1: Weigh low-temperature grease and instrument oil according to the ratio; Step 2: Divide the weighed low-temperature grease and instrument oil into three equal parts; Step 3: Place the first two equal portions of oil in a clean container and stir them in the same direction at a preset stirring speed for five minutes to ensure that the oils are fully mixed; Step 4: According to the method of step 3, stir the second and third portions of low-temperature lubricating grease and high and low-temperature instrument oil in the first portion until they are fully mixed and the preparation is complete.

[0007] The preset stirring speed in step 3 is 1000 rpm.

[0008] The mixed grease for use under extremely low temperature conditions is applied to the imported micro DC servo motor that drives the light barrier.

[0009] The method of using the mixed grease used under extremely low temperature conditions on the imported micro DC servo motor driving the light barrier includes the following steps: Step 1: Disassemble the motor; Disassembly of imported micro DC servo motor after 48 hours of forward and reverse running under 6V DC voltage; Step 2: Clean the gear grease; Step 3: Coat the gears with lubricating grease and assemble the motor; Step 4: Assembly of the motor magnetic ring; Step 5: Check the motor; Step 6: Low temperature no-load test of the motor; Step 7: Low temperature load test of the motor; Step 8: Assemble the motor light barrier component to the photoelectric observer.

[0010] The specific method of gear grease cleaning in step 2 is to soak the disassembled gear in gasoline, gently brush off the grease on the gear with a soft brush, clean it and blow it dry; then soak the gear in anhydrous ethanol, clean it, take it out and blow it dry.

[0011] The specific method of the gear coating ratio of lubricating grease and motor assembly in step 3 is to assemble the fifth gear to the motor seat. The mixed grease suitable for use under extremely low temperature conditions is evenly coated on the meshing part of the gears, with a coating thickness of 0.60 0.20 mm; then assemble the fourth, third, second and first gears in sequence, and then apply the matching grease to the meshing parts of the upper gears in sequence according to the above method; tighten the screws of the motor gears; apply 6V DC voltage to the motor, check that the forward and reverse rotation of the motor should be normal, and confirm that the gears of each level of the motor have been installed in place.

[0012] The specific method of assembling the motor magnetic ring in step 4 is to wipe off the excess grease on the outer surface of the motor and the screw head with anhydrous ethanol cotton ball, and dry the motor; use gasoline to clean and blow dry the magnetic ring; put the magnetic ring on the armature part of the motor, and apply Loctite glue on the end of the magnetic ring.

[0013] The motor low temperature no-load test is to detect the starting voltage, fluctuating current and no-load current of the motor when it is no-load at an ambient temperature of -45℃. The starting voltage should be ≤0.5V, the fluctuating current (when the voltage is 1V) ≤0.5mA, and the no-load current (when the voltage is 5V) ≤10mA; the motor low temperature load test is to assemble the motor into the light bar component and conduct a -45℃ environmental working test. First, adjust the motor voltage to 1.5V, the motor should run flexibly without sticking, and ensure that the light bar shielding piece can be accurately limited at the minimum limit position and the maximum limit position; then, adjust the voltage to 5V, and the one-way working time of the light bar component is ≤3.5S.

[0014] The present invention produces the following beneficial effects: The mixed grease of the invention is applicable to an ambient temperature range of -70°C to 150°C, has very low viscosity and good stability at an ambient temperature of -50°C, and is suitable for motors with strict low-temperature starting requirements.

[0015] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 The present invention is a flow chart of the preparation of the mixed oil; Figure 2 This is a flow chart of the method for using the mixed grease in the present invention on the imported micro DC servo motor that drives the light barrier; Figure 3 This is the appearance diagram of the imported micro DC servo motor in the embodiment of the present invention; Figure 4 This is a disassembled diagram of an imported micro DC servo motor in an embodiment of the present invention; Figure 5 This is an indication diagram of the oiling locations of the imported micro DC servo motor in the embodiment of the present invention.

[0018] In the figure: 1. Magnetic ring; 2. Motor base; 3. Five-stage gear; 4. Four-stage gear; 5. One-stage gear; 6. Three-stage gear; 7. Two-stage gear; 8. Screw. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Embodiment 1: A mixed grease used under extremely low temperature conditions includes low temperature grease and instrument oil; the weight ratio of low temperature grease to instrument oil is 1:0.6-1.5, and the grease meets the normal use of the servo motor at -40°.

[0021] Furthermore, the parameters of the low-temperature grease meet the following conditions: cone penetration of 1 / 4, 0.1mm: 74; dropping point, ℃: 234; evaporation rate 180℃, % m / m: 1.25; pressure oil separation, % m / m: 11.55; corrosion: copper sheet, 100℃, 3h; similar viscosity -60℃, 10s -1 , Pa·s:283.

[0022] Furthermore, the parameters of the instrument oil meet the following conditions: synthetic oil as the base oil, antioxidants and rust inhibitors added; and conforming to the specifications of MIL-L-6085A and DTD-822.

[0023] In actual use, the combination of low-temperature grease and instrument oil allows the mixed grease to be used in an ambient temperature range of -60℃ to 150℃. The viscosity is very small and the stability is good in an environment of -50℃, which meets the strict requirements of low-temperature starting of motors. In the process of motor gear transmission, it reduces wear and extends the service life of the motor.

[0024] The low-temperature grease used in this embodiment is Great Wall 7112 low-temperature grease, which is made of lithium soap thickened mixed oil.

[0025] Great Wall 7112 low temperature grease is a lubricating product specially designed for a wide temperature range, especially suitable for equipment working under extreme temperature conditions. The following are some key characteristic parameters of this grease: Appearance: Milky white uniform ointment Cone penetration (1 / 4 cone penetration), 0.1mm: 74 Dropping point, ℃: 234 Evaporation degree (180℃), %(m / m): 1.25 Oil pressure, %(m / m): 11.55 Corrosion (copper sheet, 100℃, 3h): qualified Similar viscosity (-60℃, 10s⁻¹), Pa·s: 283.

[0026] The instrument oil used in this embodiment is Great Wall 4112 high and low temperature instrument oil, which is a high-performance instrument oil product mainly used in precision instruments and equipment that need to work in a wide temperature range. The following is detailed information about this product: Base oil: This product is based on synthetic oil.

[0027] Additives: Various additives such as antioxidants and rust inhibitors are added to improve the overall performance of the oil.

[0028] Specifications meet standards: Conform to the US military standard MIL-L-6085A and the British DTD-822 specification requirements.

[0029] The performance characteristics are as follows: The low freezing point means that it can maintain good fluidity even at very low temperatures; the good viscosity-temperature performance means that the viscosity changes less with changes in temperature, which helps to maintain a stable lubrication effect; it has good antioxidant and rust resistance, which can extend the service life of the equipment.

[0030] Embodiment 2: Figure 1 As shown, the preparation method of the mixed grease used under extremely low temperature conditions comprises the following steps: Step 1: Weigh low-temperature grease and instrument oil according to the ratio; Step 2: Divide the weighed low-temperature grease and instrument oil into three equal parts; Step 3: Place the first two equal portions of oil in a clean container and stir them in the same direction at a preset stirring speed for five minutes to ensure that the oils are fully mixed; Step 4: According to the method of step 3, stir the second and third portions of low-temperature lubricating grease and high and low-temperature instrument oil in the first portion in turn until the preparation is completed after sufficient mixing.

[0031] Furthermore, the stirring speed preset in step three is 1000 rpm.

[0032] Embodiment 3: Figure 2-Figure 5 As shown, the mixed grease used under extremely low temperature conditions is applied to the imported micro DC servo motor that drives the light barrier.

[0033] The specific usage method on the imported micro DC servo motor that drives the light barrier is as follows: Step 1: Disassemble the motor; The motor was disassembled after the imported micro DC servo motor was run in forward and reverse directions for 48 hours under the condition of applying 6V DC voltage; the three screws 8 that fastened the motor gears were removed, and the gears of each level were removed one by one in the order of the gears. Figure 4 shown.

[0034] Step 2: Clean the gear grease; The specific method is to soak the disassembled gear in gasoline, gently brush off the grease on the gear with a soft-bristle brush, brush it clean and blow it dry; then soak the gear in anhydrous ethanol, brush it clean, take it out and blow it dry.

[0035] Step 3: Coat the gears with lubricating grease and assemble the motor; The specific method is to assemble the fifth-stage gear 3 onto the motor base 2; evenly apply the mixed grease of the present invention to the meshing part of the gears, such as Figure 5 As shown, the coating thickness is 0.60 0.20 mm; then assemble the fourth-stage gear 4, the third-stage gear 6, the second-stage gear 7, and the first-stage gear 5 in sequence, and then apply the proportioned mixed grease to the meshing parts of the previous gears in accordance with the above method; tighten the screw 8 of the motor gear; apply a 6V DC voltage to the motor, check that the forward and reverse rotation of the motor should be normal, and confirm that the gears of each stage of the motor have been installed in place.

[0036] Step 4: Assembly of the motor magnetic ring; The specific method for assembling the motor magnetic ring 1 is to wipe off the excess grease on the outer surface of the motor and the screw head with an anhydrous ethanol cotton ball, and dry the motor; use gasoline to clean the magnetic ring and blow it dry; put the magnetic ring on the armature part of the motor, and apply Loctite glue on the end of the magnetic ring.

[0037] Step 5: Check the motor; The specific method of checking the motor is to apply 6V DC voltage to the motor and run it in forward and reverse directions for two hours. During the running-in process, the motor should not be stuck, paused, make abnormal noises, have abnormal speed, or have sudden current changes. If the above phenomena occur, the motor must be disassembled, cleaned, assembled, and installed with magnetic rings before running and checking again.

[0038] Step 6: Low temperature no-load test of the motor; The specific method of the motor low temperature no-load test is to detect the starting voltage, fluctuating current, and no-load current of the motor when it is no-load at an ambient temperature of -45℃. The starting voltage should be ≤0.5V, the fluctuating current (when the voltage is 1V) ≤0.5mA, and the no-load current (when the voltage is 5V) ≤10mA; Step 7: Low temperature load test of the motor; The specific method of the motor low-temperature load test is to assemble the motor into the light barrier component and conduct a -45℃ environmental working test. First, adjust the motor voltage to 1.5V. The motor should run flexibly without sticking, and ensure that the light barrier shielding piece can be accurately limited at the minimum limit position and the maximum limit position. Then, adjust the voltage to 5V, and the one-way working time of the light barrier component is ≤3.5S.

[0039] Step 8: Assemble the motor light barrier component to the photoelectric observer.

[0040] Example 4: Comparative test The Great Wall 7112 low-temperature grease and the Great Wall 4122 high-temperature and low-temperature instrument oil were selected according to the weight ratio of 2:1, 3:1, 1:0.8, 1:2, and 1:3, and mixed grease was prepared respectively; 5 imported micro DC servo motors that drive the light bar were selected and serial numbered. After the 5 motors were disassembled, the gear grease was cleaned, the gears were coated with the lubricating grease of the matching ratio and the motor was assembled, the motor magnetic ring was assembled, and the motor was inspected, the motor low-temperature no-load test was carried out. The motor low-temperature no-load test is at an ambient temperature of -45℃, and the starting voltage, fluctuating current, and no-load current of the motor when no-load are required. The starting voltage is ≤0.5V, the fluctuating current (voltage is 1V) is ≤0.5mA, and the no-load current (voltage is 5V) is ≤10mA. The 5 motors were placed in a -45℃ temperature box and kept warm for 4 hours. The starting voltage, fluctuating current, and no-load current of the 5 motors were measured. The motor numbered 3 meets the requirements. The test records are shown in Table 1.

[0041] Schedule 1:

[0042] Motor low temperature load test: Assemble the motor No. 3 into the light barrier component, assemble as required, and then place it in a -45℃ environment working test. Adjust the motor voltage to 1.5V and observe the motor; the motor runs flexibly without any jamming, and the shielding piece of the light barrier component can be accurately limited at the minimum limit position and the maximum limit position; adjust the motor voltage to 5V, and use the light barrier time detector to measure the one-way working time of the light barrier component t≤3.5S, which meets the requirements.

[0043] After many comparative studies and test verifications, the present invention can be better applied to micro motors, so that the motors can meet the normal working requirements in the -40℃ environment. This type of ultra-low temperature grease is made of lithium soap thickened mixed oil, and can be used in the ambient temperature range of -70℃~120℃. Its advantages are that the viscosity at the ambient temperature of -50℃ is very small and the stability is good, which meets the motors with strict low temperature starting requirements; this type of high and low temperature instrument oil can be used in the ambient temperature range of -70℃~150℃, and is used for high-speed bearing reduction gears and low-speed swing bearings of aviation instrument servo motors, and has strong low temperature resistance.

[0044] This type of ultra-low temperature grease and high and low temperature instrument oil are blended in different proportions and used in the modification of this type of motor. After multiple verification tests, the optimal proportion and coating method of lubricating grease suitable for motor modification are determined.

[0045] In the absence of conflicts, technicians in this field can combine the relevant technical features in the above examples according to actual conditions to achieve corresponding technical effects. The specific combinations are not described here one by one.

[0046] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0047] In addition, the descriptions of "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0048] The above are only preferred embodiments of the present invention. The present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. Mixed grease used under extremely low temperature conditions, characterized by: It includes low-temperature lubricating grease and instrument oil; the weight ratio of the low-temperature lubricating grease to the instrument oil is 1:0.6-1.5, and the grease meets the normal use of the servo motor at -40°.

2. The mixed grease for use under extremely low temperature conditions as claimed in claim 1, characterized in that: The parameters of the low-temperature grease meet the following conditions: cone penetration is 1 / 4, 0.1mm: 74; Dropping point, ℃: 234; Evaporation rate 180℃, % m / m: 1.25; Pressure oil separation, % m / m: 11.55; Corrosion: copper sheet, 100℃, 3h; Similar viscosity -60℃, 10s -1 , Pa·s: 283; the parameters of the instrument oil meet the following conditions: synthetic oil is used as the base oil, and antioxidants and rust inhibitors are added.

3. The method for preparing a mixed fat for use under extremely low temperature conditions according to claim 1 or 2, characterized in that: The following steps are included: Step 1: Weigh low-temperature grease and instrument oil according to the ratio; Step 2: Divide the weighed low-temperature grease and instrument oil into three equal parts; Step 3: Place the first two equal portions of oil in a clean container and stir them in the same direction at a preset stirring speed for five minutes to ensure that the oils are fully mixed; Step 4: According to the method of step 3, stir the second and third portions of low-temperature lubricating grease and high and low-temperature instrument oil in the first portion in turn until the preparation is completed after sufficient mixing.

4. The method for preparing a mixed fat for use under extremely low temperature conditions according to claim 3, characterized in that: The preset stirring speed in step 3 is 1000 rpm.

5. The mixed grease for use under extremely low temperature conditions as claimed in claim 1 or 2 is applied to an imported micro DC servo motor driving a light barrier.

6. The method of using the mixed grease used under extremely low temperature conditions on the imported micro DC servo motor driving the light barrier is characterized by: The following steps are included: Step 1: Disassemble the motor; Disassembly of imported micro DC servo motor after 48 hours of forward and reverse running under 6V DC voltage; Step 2: Clean the gear grease; Step 3: Coat the gears with lubricating grease and assemble the motor; Step 4: Assembly of the motor magnetic ring; Step 5: Check the motor; Step 6: Low temperature no-load test of the motor; Step 7: Low temperature load test of the motor; Step 8: Assemble the motor light barrier component to the photoelectric observer.

7. The method for using the mixed grease used under extremely low temperature conditions on the imported micro DC servo motor driving the light barrier as claimed in claim 6, characterized in that: The specific method of gear grease cleaning in step 2 is to soak the disassembled gear in gasoline, gently brush off the grease on the gear with a soft brush, clean it and blow it dry; then soak the gear in anhydrous ethanol, clean it, take it out and blow it dry.

8. The method for using the mixed grease used under extremely low temperature conditions on the imported micro DC servo motor driving the light barrier as claimed in claim 6, characterized in that: The specific method of the gear coating ratio of lubricating grease and motor assembly in step 3 is to assemble the fifth gear to the motor seat; evenly apply the mixed grease suitable for use under extremely low temperature conditions to the meshing part of the gear, and the coating thickness is 0.60 0.20 mm; then assemble the fourth, third, second and first gears in sequence, and then apply the matching lubricating grease to the meshing parts of the previous gears in accordance with the above method; Tighten the screws of the motor gear; Apply 6V DC voltage to the motor, check that the forward and reverse rotation of the motor is normal, and confirm that the gears of each level of the motor are installed in place.

9. The method for using the mixed grease used under extremely low temperature conditions on the imported micro DC servo motor driving the light barrier as claimed in claim 6, characterized in that: The specific method of assembling the motor magnetic ring in step 4 is to wipe off the excess grease on the outer surface of the motor and the screw head with anhydrous ethanol cotton ball, and dry the motor; use gasoline to clean and blow dry the magnetic ring; put the magnetic ring on the armature part of the motor, and apply Loctite glue on the end of the magnetic ring.

10. The method for using the mixed grease used under extremely low temperature conditions on the imported micro DC servo motor driving the light barrier as claimed in claim 6, characterized in that: The motor low temperature no-load test is to detect the starting voltage, fluctuating current and no-load current of the motor when it is no-load at an ambient temperature of -45℃. The starting voltage should be ≤0.5V, the fluctuating current (when the voltage is 1V) ≤0.5mA, and the no-load current (when the voltage is 5V) ≤10mA; the motor low temperature load test is to assemble the motor into the light barrier component and conduct a -45℃ environmental working test. First, adjust the motor voltage to 1.5V, the motor should run flexibly without sticking, and ensure that the light barrier shielding piece can be accurately limited at the minimum limit position and the maximum limit position; then, adjust the voltage to 5V, and the one-way working time of the light barrier component is ≤3.5S.

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