System and method for automatically alarming, recording and detecting dropping point of lubricating grease
By designing the automatic alarm recording and detection system for grease dropping points, and using automation equipment and temperature collectors, the problems of manual time-consuming and low accuracy of existing detection methods are solved, and efficient and accurate grease dropping points detection is achieved.
Patent Information
- Application Number
- CN202510050663.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-13
- Publication Date
- 2025-05-16
AI Technical Summary
The existing grease drop point detection methods require manual visual observation, which consumes manpower, is low in work efficiency, and is low in detection accuracy. There are problems of missed viewing, misreading and lag, which affects the accuracy of detection.
A grease drop point automatic alarm recording and detection system is designed, using an air-flow-type temperature-controlled glass cover, winding resistance wire, temperature measuring thermocouple and induction thermocouple, fully automatic detection is achieved through a temperature collector, automatically identifying the drip point and alarming.
Fully automatic detection is realized, manpower is liberated, work efficiency is improved, personnel errors are eliminated, the accuracy of detection results is improved, and the risk of misjudgment is reduced.
Smart Images
Figure CN120009331A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of chemical analysis, in particular to a lubricating grease dropping point automatic alarm recording detection system and method. Background Art
[0002] Many important parts of liquid rocket engines need to be coated with grease on the surface during the production and assembly process to reduce friction between movements, prevent threads from biting, and enhance lubrication. Therefore, it is necessary to ensure that the grease has excellent lubrication properties and does not fail in the use environment. The grease dropping point is one of the important indicators for evaluating the lubrication performance of grease. It refers to the temperature point at which the grease changes from solid to liquid, which can well reflect the temperature resistance of the grease. At present, the detection of grease dropping point requires manual visual observation throughout the process. The grease cup is fixed in the test tube with a wooden stopper, and a glass mercury thermometer is inserted into the grease for temperature detection. After the temperature rises, the human eye observes the dripping of the grease, and the thermometer reading when the first drop of grease drips is recorded, which is the grease dropping point. The current detection of grease dropping point has the following problems:
[0003] (1) During the testing process, personnel are required to be on duty throughout the process and observe visually, which consumes manpower and has low work efficiency;
[0004] (2) During the test, a traditional mercury thermometer was used to record the temperature, with an accuracy of 2°C, which is relatively low;
[0005] (3) Observe the dripping of grease with the naked eye. Since the grease is transparent when it melts and drips at high temperature, there may be a risk of missing or misreading, which affects the accuracy of the detection.
[0006] (4) During the test, the reading of the thermometer is read after the grease dripping is observed by the naked eye, which has a certain lag. The whole process takes 3 seconds, and the average temperature difference reaches 4°C, which makes the measurement result higher and the error of the test results of different personnel is large;
[0007] (5) The grease cup is fixed in the test tube by a wooden stopper. The test tube is placed on a base and is prone to tilting, which may cause uneven heating and affect the accuracy of the test results. Summary of the invention
[0008] The invention provides a grease dropping point automatic alarm recording detection system and method, aiming to solve the problems in the background technology.
[0009] In the first aspect, a grease dropping point automatic alarm recording and detection system is provided, a grease cup, a copper tube and a connector, a cork, an iron frame table tooling, a movable hanging ring, a hollow straight-through test tube, a wrap-around resistance wire, an air circulation temperature control glass cover, a temperature measuring thermocouple, an induction thermocouple, and a temperature acquisition instrument;
[0010] The air circulation type temperature control glass cover is fixed to the iron frame table tooling through a movable hanging ring; the air circulation type temperature control glass cover is used to load the hollow straight-through test tube and the surrounding resistance wire, and the hollow straight-through test tube is fixed to the opening of the air circulation type temperature control glass cover through the movable hanging ring; the surrounding resistance wire is surrounded by the outer circumference of the hollow straight-through test tube; the hollow straight-through test tube is filled with a grease cup, a copper tube and a connector, and is fixed by a cork; a temperature measuring thermocouple is connected to the copper tube and the connector for temperature measurement; an induction thermocouple is placed under the air circulation type temperature control glass cover to receive the grease from the grease cup and measure the temperature; the temperature detected by the temperature measuring thermocouple and the induction thermocouple is fed back to the temperature acquisition instrument.
[0011] In a second aspect, a method for automatic alarm recording and detection of grease dropping point is provided, the method being executed by a system as described in any one of the implementations of the first aspect above, the method comprising:
[0012] Step (1), fill the grease cup with grease, put it into the hollow straight test tube, and fix it with a cork; clamp the hollow straight test tube with the grease cup on the iron frame table tooling; adjust the hollow straight test tube and place it in the wound resistance wire;
[0013] Step (2), placing a temperature measuring thermocouple at the center of the grease cup;
[0014] Step (3), placing an induction thermocouple just below the grease hanging position, and instantaneously sensing the grease dripping by the induction thermocouple;
[0015] Step (4), connecting the temperature measuring thermocouple and the induction thermocouple to a temperature acquisition instrument, starting the wound resistance wire to heat the grease, and continuously recording the temperatures of the temperature measuring thermocouple and the induction thermocouple through the temperature acquisition instrument during the detection process;
[0016] Step (5), when the grease temperature reaches the dropping point, the grease drips onto the identification device, and the peak generated by the instantaneous temperature difference accurately identifies the dropping point time t a ;
[0017] Step (6), in the temperature measuring thermocouple data recorded by the temperature acquisition instrument, according to the dropping point generation time t a , corresponding to the time axis at t a The temperature value T of the thermocouple sample recorded at a , and automatically record the temperature T a is the dropping point temperature of the grease.
[0018] In combination with the second aspect, in certain implementations of the second aspect, in step (1), the outer diameter of the hollow straight test tube is smaller than the fixed ring of the hanging tooling, the wall thickness is 2 mm, and the diameter of the upper edge mounting point matches the inner diameter of the fixed ring to ensure that it does not loosen during the detection process.
[0019] In combination with the second aspect, in certain implementations of the second aspect, in step (1), the wound resistance wire is fully surrounded by the grease cup.
[0020] In combination with the second aspect, in certain implementations of the second aspect, in step (1), an air circulation type temperature control glass cover is provided outside the wound resistance wire, and the air circulation type temperature control glass cover is an elliptical glass cover with upper and lower openings, a hollow straight-through test tube is inserted into the upper end, and the lower end is fully open.
[0021] In combination with the second aspect, in certain implementations of the second aspect, in step (2), a temperature measuring thermocouple with a temperature detection range of (0-300)°C and an accuracy better than ±1°C is selected, one end of which is placed in the grease to detect the grease dropping point temperature; the other end is connected to the I channel of the temperature acquisition instrument, and the sampling temperature value T is recorded once every 0.5s. 1 , T 2 , T 3 , T 4 …until the test is complete.
[0022] In combination with the second aspect, in certain implementations of the second aspect, in step (3), an induction thermocouple with a diameter of 0.2 mm and an induction time of ≤0.5 s is used, one end of the induction thermocouple is placed on the table below the temperature-controlled glass cover to ensure that the grease accurately drips into the induction area, and the other end is connected to the II line of the temperature acquisition instrument, and the sampling temperature value T is recorded once every 0.5 s. 感1 , T 感2 , T 感3 , T 感4 …until the test is completed, the instantaneous temperature change caused by the grease dripping is recorded, and the time t when the dripping point occurs is identified a .
[0023] In conjunction with the second aspect, in certain implementations of the second aspect, the method further includes: when identifying the dripping point time t a At the same time, the automatic alarm device is triggered to send out an alarm signal.
[0024] In combination with the second aspect, in certain implementations of the second aspect, the automatic alarm device includes a temperature control meter and an audible and visual alarm. A temperature difference threshold of ±5°C is preset in the temperature control meter. When the temperature change exceeds the threshold, the automatic alarm device is immediately triggered, and the audible and visual alarm sends out an alarm signal.
[0025] In conjunction with the second aspect, in some implementations of the second aspect, the method further includes:
[0026] Repeat the above steps to detect multiple groups of dropping point values, and take the average value of the multiple groups as the final value of the grease dropping point test result.
[0027] Compared with the prior art, the solution provided by the present invention includes at least the following beneficial technical effects:
[0028] The detection system and the detection method realize fully automatic detection, realize full-time automatic temperature recording by converting temperature signals into electrical signals, automatically identify the dropping point and alarm. During the detection process, the detection personnel no longer need to observe visually throughout the whole process, which fully liberates manpower and effectively improves work efficiency. At the same time, it effectively eliminates human errors and solves the problem of low accuracy of detection results. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] Figure 1 A schematic diagram of a grease dropping point automatic alarm recording and detection system provided for the invention.
[0030] Figure 2 A schematic diagram of the automatic alarm recording detection results of a grease dropping point provided by the invention.
[0031] Figure 3 A flow chart of a grease dropping point automatic alarm recording detection method provided by the invention. DETAILED DESCRIPTION
[0032] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.
[0033] See attached Figure 1 The present invention provides a grease dropping point automatic alarm recording detection system, including a grease cup 1, a copper tube and a connector 2, a cork 3, an iron frame table tooling 4, a movable hanging ring 5, a hollow straight-through test tube 6 (with a total outer diameter of 44 mm, a wall thickness of 2 mm, and a diameter of 50 mm at the upper edge clamping point), a surrounding resistance wire 7, an air circulation temperature control glass cover 8, a temperature measuring thermocouple 9 (detection range (0-300) ° C, accuracy better than ±1 ° C), an induction thermocouple 10 (diameter 0.2 mm, induction time ≤0.5 s), an audible and visual alarm 11, and a temperature collector 12.
[0034] The air circulation type temperature control glass cover 8 is fixed to the iron frame table tooling 4 through the movable hanging ring 5. The air circulation type temperature control glass cover 8 is used to load the hollow straight test tube 6 and the surrounding resistance wire 7. The hollow straight test tube 6 is fixed to the opening of the air circulation type temperature control glass cover 8 through the movable hanging ring 5. The surrounding resistance wire 7 surrounds the outer circumference of the hollow straight test tube 6. The hollow straight test tube 6 contains a grease cup 1, a copper tube and a connector 2, and is fixed by a cork 3. The temperature measuring thermocouple 9 is connected to the copper tube and the connector 2 for temperature measurement; the induction thermocouple 10 is placed under the air circulation type temperature control glass cover 8 to receive the grease from the grease cup 1 and measure the temperature. The temperature detected by the temperature measuring thermocouple 9 and the induction thermocouple 10 is fed back to the temperature acquisition instrument 12.
[0035] The present invention provides a method for automatic alarm recording and detection of grease dropping point. The specific implementation steps are as follows.
[0036] Step 1: Fill the grease cup 1 with grease, place it into the hollow straight test tube 6, and fix it with a cork 3.
[0037] Fill the grease cup 1 with grease. You can use a scraper to do this. It is required that there are no pores inside the grease and the top of the grease is flush with the edge of the cup. Connect the grease cup 1 through the copper tube and the connector 2 and install it into the hollow straight test tube 6, and fix it with a cork 3. This embodiment designs a hollow straight test tube 6 with an outer diameter of 44mm, a wall thickness of 2mm, and a diameter of 50mm at the upper edge. The outer diameter of the hollow straight test tube 6 is smaller than the fixed collar of the hanging tooling, and the diameter of the upper edge clamping is slightly larger than the fixed collar to ensure that it does not loosen during the detection process.
[0038] Step 2: Clamp the hollow straight-through test tube 6 containing the grease cup 1 onto the iron frame table tooling 4.
[0039] Design an iron frame bench tool 4, use 30CrMnSiA to make a circular base with a diameter of 10cm and a thickness of 3cm, and weld a support rod perpendicular to the base in the center of the base to ensure the stability and load-bearing capacity of the tool. Install a movable hanging ring 5 on the vertical rod, and weld the fixed ring for placing the hollow straight test tube 6 on the movable hanging ring 5. That is, the easy operability of fixing the hollow straight test tube 6 is guaranteed, and the fixed position of the hollow straight test tube 6 can be adjusted according to needs. Clamping the hollow straight test tube 6 equipped with the grease cup 1 on the iron frame bench tool 4 can ensure that the grease drips vertically on the induction thermocouple 10, enhance the induction sensitivity, and ensure that the grease cup 1 does not collide with the wound resistance wire 7, resulting in uneven heating of the grease.
[0040] Step 3: Adjust and place the hollow straight test tube 6 inside the wound resistance wire 7.
[0041] The wound resistance wire 7 is fully surrounded around the grease cup 1, and the temperature rises quickly and evenly, so that the grease is heated evenly. There is an air circulation temperature control glass cover 8 outside the wound resistance wire 7. The air circulation temperature control glass cover 8 is an elliptical glass cover with upper and lower openings, with a hollow straight-through test tube 6 inserted at the upper end and a full opening at the lower end. This not only ensures the temperature control during the detection process, but also enables the thermocouple to be placed in an air circulation environment.
[0042] Step 4: Place the temperature measuring thermocouple 9 at the center of the grease cup 1 to ensure that the temperature measuring thermocouple 9 can accurately sense and record the grease temperature value in real time through the temperature collector 12 .
[0043] Select a temperature measuring thermocouple 9 with a temperature detection range of (0-300)°C and an accuracy better than ±1°C. Place one end of the thermocouple at the center of the grease cup 1 to detect the grease dropping point temperature. Connect the other end to the I channel of the temperature acquisition instrument 12 and record the sampling temperature value T every 0.5s. 1 , T 2 , T 3 , T 4 …until the test is complete.
[0044] Step 5: Place an induction thermocouple 10 just below the grease hanging position, and the induction thermocouple 10 can instantly sense the grease dripping.
[0045] Use an induction thermocouple 10 with a diameter of 0.2 mm and an induction time of ≤ 0.5 s. Place one end of the induction thermocouple 10 on the table below the temperature-controlled glass cover to ensure that the grease drops accurately in the induction area. Connect the other end to the II channel of the temperature collector 12 and record the sampling temperature value T every 0.5 s. 感1 , T 感2 , T 感3 , T 感4 …until the test is completed. By recording the instantaneous temperature change caused by the grease dripping, the time t when the dripping point occurs can be identified. a .
[0046] Before the grease drips, the temperature value shows a linear growth trend. Since the induction thermocouple 10 is placed on the table below the temperature-controlled glass cover and the surrounding air is kept circulating, the temperature increases slowly. When the grease drips on the induction device, the temperature suddenly increases and the temperature curve shows an obvious peak. The time corresponding to the peak is the time t when the grease drips. a .
[0047] Step 6: Connect the temperature measuring thermocouple 9 and the induction thermocouple 10 to the temperature collector 12, start the wound resistance wire 7 to heat the grease, and continuously record the temperatures of the temperature measuring thermocouple 9 and the induction thermocouple 10 through the temperature collector 12 during the detection process.
[0048] The temperature collector 12 collects and records the two temperatures at the same time, with an interval of 0.5s. The test result recording curve is as follows Figure 2 shown.
[0049] Step 7: When the grease temperature reaches the dropping point, the grease drips onto the induction thermocouple 10, and the dropping point time t is accurately identified by the peak generated by the instantaneous temperature difference. a , and trigger the automatic alarm device to send out an alarm signal.
[0050] The automatic alarm device includes a temperature control meter and an audible and visual alarm 11. A temperature difference threshold of ±5°C is preset in the temperature control meter. At the moment of grease dripping, the temperature change can reach at least 50°C. When the temperature change exceeds the threshold, the automatic alarm device immediately triggers an audible and visual alarm, and simultaneously sends out a strong sound and light prompt signal to remind the inspection personnel at the first time.
[0051] Step 8: In the temperature measuring thermocouple 9 data recorded by the temperature acquisition instrument 12, according to the dropping point generation time t a , corresponding to the time axis at t a The temperature value T of the thermocouple 9 sampled at the time of recording a , and automatically record the temperature T a is the dropping point temperature of the grease.
[0052] The device realizes automatic detection and recording of grease dropping point by converting electrical signals into temperature values. The detection result recording curve is shown in the figure below: Figure 2 shown.
[0053] Step 9: Repeat the above steps to test 3 groups of dropping point values. The average value of the 3 groups is the final value of the grease dropping point test result.
[0054] The repeatability of the three sets of temperature values for the grease dropping point test should not exceed 7°C according to national standards. If the repeatability does not meet the requirements, retesting is required. The average value of the three sets of test results that meet the repeatability requirements is the dropping point of the grease.
[0055] Step 10: Issue this test report after the measurement is completed.
[0056] Although the present invention is disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the claims of the present invention.
Claims
1. A grease dropping point automatic alarm recording detection system, characterized in that: Grease cup, copper tube and connector, cork, iron frame table tooling, movable hanging ring, hollow straight-through test tube, wrap-around resistance wire, air circulation temperature control glass cover, temperature measuring thermocouple, induction thermocouple, temperature acquisition instrument; The air circulation type temperature control glass cover is fixed to the iron frame table tooling through a movable hanging ring; the air circulation type temperature control glass cover is used to load the hollow straight-through test tube and the surrounding resistance wire, and the hollow straight-through test tube is fixed to the opening of the air circulation type temperature control glass cover through the movable hanging ring; the surrounding resistance wire is surrounded by the outer circumference of the hollow straight-through test tube; the hollow straight-through test tube is filled with a grease cup, a copper tube and a connector, and is fixed by a cork; a temperature measuring thermocouple is connected to the copper tube and the connector for temperature measurement; an induction thermocouple is placed under the air circulation type temperature control glass cover to receive the grease from the grease cup and measure the temperature; the temperature detected by the temperature measuring thermocouple and the induction thermocouple is fed back to the temperature acquisition instrument.
2. A method for automatic alarm recording and detection of grease dropping point, characterized in that: The method is performed by the system according to claim 1, and the method comprises: Step (1), fill the grease cup with grease, put it into the hollow straight test tube, and fix it with a cork; clamp the hollow straight test tube with the grease cup on the iron frame table tooling; adjust the hollow straight test tube and place it in the wound resistance wire; Step (2), placing a temperature measuring thermocouple at the center of the grease cup; Step (3), placing an induction thermocouple just below the grease hanging position, and instantaneously sensing the grease dripping by the induction thermocouple; Step (4), connecting the temperature measuring thermocouple and the induction thermocouple to a temperature acquisition instrument, starting the wound resistance wire to heat the grease, and continuously recording the temperatures of the temperature measuring thermocouple and the induction thermocouple through the temperature acquisition instrument during the detection process; Step (5), when the grease temperature reaches the dropping point, the grease drips onto the identification device, and the peak generated by the instantaneous temperature difference accurately identifies the dropping point time t a ; Step (6), in the temperature measuring thermocouple data recorded by the temperature acquisition instrument, according to the dropping point generation time t a , corresponding to the time axis at t a The temperature value T of the thermocouple sample recorded at a , and automatically record the temperature T a is the dropping point temperature of the grease.
3. The method according to claim 2, characterized in that In step (1), the outer diameter of the hollow straight test tube is smaller than the fixed collar of the hanging fixture, the wall thickness is 2 mm, and the diameter of the upper edge clamping part matches the inner diameter of the fixed collar to ensure that it will not loosen during the detection process.
4. The method according to claim 2, characterized in that: In step (1), the wound resistance wire is fully surrounded around the grease cup.
5. The method according to claim 2, characterized in that: In step (1), an air circulation type temperature control glass cover is arranged outside the wound resistance wire, and the air circulation type temperature control glass cover is an elliptical glass cover with upper and lower openings, a hollow straight-through test tube is inserted into the upper end, and the lower end is fully open.
6. The method according to claim 2, characterized in that In step (2), a temperature measuring thermocouple with a temperature detection range of (0-300)°C and an accuracy better than ±1°C is selected, one end of which is placed in the grease to detect the grease dropping point temperature; the other end is connected to channel I of the temperature acquisition instrument, and the sampling temperature values T1, T2, T3, T4... are recorded once every 0.5s until the detection is completed.
7. The method according to claim 2, characterized in that In step (3), an induction thermocouple with a diameter of 0.2 mm and an induction time of ≤ 0.5 s is used. One end of the induction thermocouple is placed on the table below the temperature-controlled glass cover to ensure that the grease drops accurately in the induction area. The other end is connected to the II line of the temperature acquisition instrument, and the sampling temperature value T is recorded every 0.5 s. 感1 , T 感2 , T 感3 , T 感4 …until the test is completed, the instantaneous temperature change caused by the grease dripping is recorded, and the time t when the dripping point occurs is identified a .
8. The method according to claim 2, characterized in that: The method further comprises: identifying the dropping point time t a At the same time, the automatic alarm device is triggered to send out an alarm signal.
9. The method according to claim 8, characterized in that The automatic alarm device includes a temperature control meter and an audible and visual alarm. A temperature difference threshold of ±5°C is preset in the temperature control meter. When the temperature change exceeds the threshold, the automatic alarm device is immediately triggered and the audible and visual alarm sends out an alarm signal.
10. The method according to claim 2, characterized in that The method further comprises: Repeat the above steps to detect multiple groups of dropping point values, and take the average value of the multiple groups as the final value of the grease dropping point test result.