Height detection and sampling method for grease in oil tank

Abstract

The invention relates to the technical field of grease detection, discloses a method for detecting the height of grease in an oil tank and sampling, and aims to solve the problems of high labor intensity and low operation efficiency and accuracy in the conventional method for detecting the height of grease in the oil tank. Controlling the gear motor to drive the reel to rotate, so that the plumb bob descends from the initial position at a constant speed, and acquiring a pressure value detected by the tension sensor in real time when the plumb bob descends; according to the pressure value, the starting moment when a plumb bob makes contact with the liquid level and the ending moment when the plumb bob makes contact with the tank bottom are determined, the descending length of the lifting rope between the starting moment and the ending moment is determined, and the descending length is the height of grease in the oil tank. According to the invention, the labor intensity of grease height detection and sampling is reduced, and the working efficiency and accuracy are improved.

Description

Technical Field

[0001] The present application relates to the technical field of grease detection, and in particular to a method for detecting the grease height in an oil tank and sampling the grease. Background Art

[0002] At present, the grease height in the oil tank is basically measured by the manual gauge method, that is, experienced workers use the oil dipstick to measure the oil tank liquid level, use the gauge tool (steel tape with a copper ruler hammer hanging below) to insert the steel tape from the oil hole on the top of the tank, read the gauge height and oil immersion height, and then get the oil tank liquid level. This method is labor-intensive for workers, and the work efficiency and accuracy are low. At the same time, the current grease sampling in the oil tank is basically done manually, that is, the sampling barrel is connected with a rope, lowered to the specified height for sampling, and then lifted up. Because the oil tank is high and the amount of grease stored in the oil tank is uncertain, the sampling point cannot be accurately grasped, and due to the resistance of the grease, when the rope is lifted up after sampling, there are also problems of high labor intensity and low work efficiency for workers. Summary of the invention

[0003] The present application aims to solve the problems of high labor intensity, low working efficiency and accuracy in the existing method for detecting the grease level in oil tanks, and proposes a method for detecting and sampling the grease level in oil tanks.

[0004] The technical solution adopted by this application to solve the above technical problems is:

[0005] In a first aspect, the present application provides a method for detecting the grease level in an oil tank, the method comprising:

[0006] The sampler is placed above the oil tank opening, the sampler comprises a frame, and a reduction motor, a winding wheel and a fixed pulley arranged on the frame, the winding wheel is connected to the rotating shaft of the reduction motor by transmission, the hanging rope on the winding wheel is connected to the plumb bob through a hook after passing through the fixed pulley, and the fixed pulley is connected to the frame through a tension sensor;

[0007] Control the reduction motor to drive the winding wheel to rotate, so that the plumb bob drops at a constant speed from the initial position, and obtain the pressure value detected by the tension sensor in real time when the plumb bob drops;

[0008] The starting time when the plumb bob contacts the liquid surface and the ending time when the plumb bob contacts the tank bottom are determined based on the pressure value, and the descending length of the suspension rope between the starting time and the ending time is determined. The descending length is the grease height in the oil tank.

[0009] Further, determining the starting time when the plumb bob contacts the liquid surface and the ending time when the plumb bob contacts the tank bottom according to the pressure value specifically includes:

[0010] The absolute pressure difference between the current moment and the previous moment is obtained in real time. When the absolute pressure difference is greater than a first preset value, the corresponding moment is used as the starting moment. When the absolute pressure difference is greater than a second preset value, the corresponding moment is used as the end moment. The second preset value is greater than the first preset value.

[0011] Further, determining the descending length of the suspension rope between the starting time and the end time specifically includes:

[0012] The number of revolutions of the reduction motor between the starting time and the end time is determined, and the descending length of the suspension rope is determined according to the number of revolutions.

[0013] Furthermore, the method further comprises:

[0014] After determining the end point moment when the plumb bob contacts the tank bottom, the reduction motor is controlled to reverse and the plumb bob is recovered. During the recovery process, it is detected in real time whether the plumb bob has reached the initial position. If so, the reduction motor is controlled to stop working.

[0015] Furthermore, the method further comprises:

[0016] An oil scraper chuck is arranged on the frame. The lifting rope passes through the fixed pulley, passes through the oil scraper chuck and is connected to the plumb bob. The oil scraper chuck is used to scrape off grease on the surface of the lifting rope.

[0017] Furthermore, the sling is a measuring tape.

[0018] Furthermore, the method further comprises: arranging a control panel on the frame, controlling the reduction motor through the control panel, and sending the grease height in the oil tank to the control panel for display.

[0019] In a second aspect, the present application provides a method for sampling grease in an oil tank, the method comprising the steps of the method for detecting the grease height in an oil tank as described in the first aspect, and further comprising:

[0020] A plurality of sampling positions of the grease in the oil tank are determined according to the height of the grease in the oil tank, and after the plumb bob is replaced with a sampling barrel, the sampling operation is performed according to the sampling positions.

[0021] Further, the sampling operation is performed according to the sampling position, specifically including:

[0022] Determine the number of rotations of the reduction motor corresponding to each sampling position, and control the reduction motor to drive the winding wheel to rotate according to the number of rotations, so that the sampling barrel drops from the initial position. When the sampling barrel reaches the sampling position, control the reduction motor to reverse, pull up the sampling barrel, and complete the sampling operation.

[0023] Furthermore, the method further comprises:

[0024] During the process of pulling up the sampling barrel, it is detected in real time whether the sampling barrel reaches the initial position, and if so, the reduction motor is controlled to stop working.

[0025] The beneficial effects of the present application are as follows: the grease height detection and sampling method in the oil tank provided by the present application can detect the grease height by placing the sampler above the oil tank mouth, thereby reducing labor intensity and improving work efficiency. The sampler uses a reduction motor to drive the winding wheel to rotate to retract and release the suspension rope, and the suspension rope is connected to the plumb bob after passing through the fixed pulley with a tension sensor. When the plumb bob just touches the liquid surface and the bottom of the oil tank during the descent process, the tension sensor will have a sudden change in tension. By recording the descent length of the suspension rope in the time period between the two sudden changes in tension, the accurate grease depth in the oil tank can be obtained, and then the sampling position can be determined. The subsequent reduction motor can also accurately send the sampling barrel to the sampling position, thereby improving the accuracy of grease height detection and grease sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of a flow chart of a method for detecting the grease level in an oil tank provided in an embodiment of the present application;

[0027] Figure 2 A schematic diagram of a three-dimensional structure of a sampler provided in an embodiment of the present application;

[0028] Figure 3 A front view of a sampler provided in an embodiment of the present application;

[0029] Figure 4 A schematic diagram of a process for sampling grease in an oil tank provided in an embodiment of the present application;

[0030] Description of reference numerals:

[0031] 1-frame, 2-reduction motor, 3-winding wheel, 31-suspension rope; 4-fixed pulley, 41-tension sensor, 5-plumb bob, 6-sampling barrel, 7-position sensor, 8-oil scraping chuck. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0033] The technical solution of the embodiment of the present application is applicable to application scenarios where it is necessary to detect the liquid level and take samples of grease in oil tanks. Since the current method is basically for workers to manually detect the liquid level in oil tanks, that is, workers use a measuring tool to insert a steel tape measure from the oil hole on the top of the tank, read the measuring height and the oil immersion height, and thus obtain the oil tank liquid level. This method has high labor intensity for workers, and low work efficiency and accuracy.

[0034] Based on this, the technical solution of the present application is proposed. In an embodiment of the present application, a sampler is placed above the mouth of the oil tank, and the sampler includes a frame, and a reduction motor, a winding wheel and a fixed pulley arranged on the frame, the winding wheel is connected to the rotating shaft of the reduction motor by driving, and the suspension rope on the winding wheel is connected to the plumb bob through a hook after passing through the fixed pulley, and the fixed pulley is connected to the frame through a tension sensor; the reduction motor is controlled to drive the winding wheel to rotate, so that the plumb bob drops at a uniform speed from an initial position, and the pressure value detected by the tension sensor is obtained in real time when the plumb bob drops; the starting moment when the plumb bob contacts the liquid surface and the end moment when the plumb bob contacts the bottom of the tank are determined according to the pressure value, and the descending length of the suspension rope between the starting moment and the end moment is determined, and the descending length is the grease height in the oil tank.

[0035] Specifically, the embodiment of the present application can detect the grease height by placing the sampler above the oil tank mouth. After placing the sampler above the oil tank mouth, the reduction motor is controlled to drive the winding wheel to rotate to lower the lifting rope. The lifting rope is passed around the fixed pulley with the tension sensor and then connected to the plumb bob, so that the plumb bob descends at a constant speed from the initial position. When the plumb bob just touches the liquid surface and the bottom of the oil tank during the descent, the tension sensor will produce a sudden change in tension. Therefore, the starting moment when the plumb bob contacts the liquid surface and the end moment when the plumb bob contacts the bottom of the tank can be determined according to the change in the tension value detected by the tension sensor. By determining the descending length of the lifting rope in the time period between the starting moment and the end moment, the grease height in the oil tank can be determined.

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0037] See also Figure 1 The method for detecting the grease level in an oil tank provided in an embodiment of the present application comprises the following steps:

[0038] S1. Place the sampler above the oil tank opening.

[0039] See also Figure 2 and Figure 3 In the embodiment of the present application, the sampler includes a frame 1, and a reduction motor 2, a winding wheel 3 and a fixed pulley 4 arranged on the frame 1. The winding wheel 3 is connected to the rotating shaft of the reduction motor 2 through a transmission, and the hanging rope 31 on the winding wheel 3 is connected to the plumb bob 5 through a hook after passing through the fixed pulley 4. The fixed pulley 4 is connected to the frame 1 through a tension sensor 41.

[0040] In the above-mentioned sampler, when the shaft of the reduction motor 2 rotates forward, it drives the winding wheel 3 and the fixed pulley 4 to rotate, so that the plumb bob 5 drops from the initial position. When the shaft of the reduction motor 2 rotates reversely, it drives the winding wheel 3 and the fixed pulley 4 to rotate, so that the plumb bob 5 is recovered and raised.

[0041] S2, controlling the reduction motor 2 to drive the winding wheel 3 to rotate, so that the plumb bob 5 drops at a constant speed from the initial position, and obtaining the pressure value detected by the tension sensor 41 in real time when the plumb bob 5 drops.

[0042] Specifically, after placing the sampler above the oil tank opening, the reduction motor 2 is controlled to rotate forward at a constant speed, so that the plumb bob 5 can be dropped from the initial position at a constant speed, and then the tension sensor 41 is used to detect the tension value in real time.

[0043] S3. Determine the starting time when the plumb bob 5 contacts the liquid surface and the ending time when the plumb bob 5 contacts the tank bottom according to the pressure value, and determine the descending length of the suspension rope 31 between the starting time and the ending time, wherein the descending length is the grease height in the oil tank.

[0044] In an embodiment of the present application, the starting moment when the plumb bob 5 contacts the liquid surface and the end moment when the plumb bob 5 contacts the bottom of the tank are determined according to the pressure value, specifically including: obtaining the absolute pressure difference between the current moment and the previous moment in real time, when the absolute pressure difference is greater than a first preset value, taking the corresponding moment as the starting moment, and when the absolute pressure difference is greater than a second preset value, taking the corresponding moment as the end moment, and the second preset value is greater than the first preset value.

[0045] Specifically, during the process of the plumb bob 5 slowly descending at a uniform speed from the initial position, when the plumb bob 5 contacts the liquid surface, due to the buoyancy, the tension value detected by the tension sensor 41 will suddenly change, and the absolute pressure difference between this moment and the previous moment will increase. Based on this, when the absolute pressure difference is greater than the first preset value, the embodiment of the present application determines that the plumb bob 5 contacts the liquid surface, and takes this moment as the starting moment. Then, the plumb bob 5 continues to descend until it contacts the bottom of the tank, and the tension value detected by the tension sensor 41 will suddenly change again, and the absolute pressure difference between this moment and the previous moment will also increase. Based on this, when the absolute pressure difference is greater than the second preset value, the embodiment of the present application determines that the plumb bob 5 contacts the bottom of the tank, and takes this moment as the end moment.

[0046] Among them, the first preset value and the second preset value can be set according to actual conditions, and the embodiment of the present application does not limit this. Since the pressure value when the plumb bob 5 just contacts the liquid surface is obviously greater than the pressure value when the plumb bob 5 contacts the bottom of the tank, the second preset value is greater than the first preset value.

[0047] It can be understood that the descending length of the hanging rope 31 between the starting moment and the end moment is the grease height in the oil tank. In the embodiment of the present application, determining the descending length of the hanging rope between the starting moment and the end moment specifically includes: determining the number of rotations of the reduction motor 2 between the starting moment and the end moment, and determining the descending length of the hanging rope according to the number of rotations, that is, converting the number of rotations of the reduction motor 2 into the descending length of the hanging rope 31.

[0048] In practical applications, after determining the starting moment, the height from the initial position to the starting moment can be determined according to the number of revolutions of the reduction motor 2. After determining the end moment, the height from the initial position to the end moment can be determined according to the number of revolutions of the reduction motor 2. The descending length of the suspension rope 31 between the starting moment and the end moment can be calculated based on the two heights.

[0049] In an embodiment of the present application, the method also includes: after determining the end moment when the plumb bob contacts the bottom of the tank, controlling the reduction motor to reverse, recovering the plumb bob, and detecting in real time during the recovery process whether the plumb bob reaches the initial position, and if so, controlling the reduction motor to stop working.

[0050] Specifically, after the plumb bob contacts the bottom of the tank, the reduction motor 2 can be controlled to reverse and retract the plumb bob 5 to the initial position. The initial position can be determined by manually controlling the reduction motor 2 to stop. Because the structure itself is not high, the error range is not very large. The preferred solution is, Figure 3 As shown, a position sensor 7 is also provided on the frame 1, and the position sensor 7 is arranged on the path that the plumb bob 5 will pass through. During the process of retracting the plumb bob 5, when the position sensor 7 detects the position of the plumb bob 5, the reduction motor 2 is automatically controlled to stop working. In this way, the reduction motor 2 can be automatically stopped, the control is more accurate, and it is conducive to automatic control.

[0051] In the embodiment of the present application, the hanging rope 31 is preferably a tape measure with sufficient strength. The tape measure is a flat structure, which is easier to store, and has scales on it, which can facilitate workers to intuitively understand the sampling position and perform comparative testing.

[0052] When the hanging rope 31 is recovered, a lot of grease will be attached, which is easy to contaminate the winding wheel 3. Therefore, in the embodiment of the present application, an oil scraper chuck 8 can be set on the frame 1, and the hanging rope 31 passes through the oil scraper chuck 8 after passing through the fixed pulley 4 and then connected to the plumb bob 5. The oil scraper chuck 8 can be pressed on the hanging rope 31 by a spring structure. Another reason for using a tape measure for the hanging rope 31 is that the oil scraper chuck 8 can be better pressed on both sides of the tape measure, so as to better scrape off the grease on its surface.

[0053] In an embodiment of the present application, the method further includes: providing a control panel on the frame 1, controlling the reduction motor through the control panel, and sending the grease height in the oil tank to the control panel for display.

[0054] Specifically, workers can operate the equipment to measure the grease height through the control panel, and can also learn information such as the grease height through the control panel.

[0055] In summary, the method for detecting the grease height in the oil tank provided in the embodiment of the present application can detect the grease height by placing the sampler above the oil tank mouth, lowering the plumb bob 5 by controlling the reduction motor 2 to drive the winding wheel to rotate, and connecting the suspension rope 31 to the plumb bob 5 after passing it around the fixed pulley 4 with the tension sensor 2, thereby reducing the labor intensity and improving the work efficiency. In addition, the liquid level in the oil tank can be accurately detected according to the change of the detected tension value, thereby improving the accuracy of the liquid level detection.

[0056] See also Figure 4 Based on the above technical solution, the embodiment of the present application further proposes a method for sampling grease in an oil tank, the method comprising the steps of the method for detecting the grease height in an oil tank as described in the embodiment of the present application, and the method further comprises the following steps:

[0057] S4. Determine multiple sampling positions of the grease in the oil tank according to the height of the grease in the oil tank, replace the plumb bob 5 with the sampling barrel 6, and then perform sampling operations according to the sampling positions.

[0058] In practical applications, first, multiple sampling positions can be determined according to the height of the oil in the oil tank and the sampling requirements, such as the positions of the upper, middle and lower sampling points, and the number of rotations of the reduction motor 2 corresponding to each sampling position can be determined. Then the plumb bob 5 is removed and replaced with a sampling barrel 6. The bottom of the sampling barrel 6 is provided with a one-way valve that opens upward, and the top is provided with an opening or an open structure. Finally, according to the number of rotations corresponding to each sampling position, the reduction motor 2 is controlled to lower the sampling barrel 6. After the sampling barrel 6 reaches the sampling position and completes the sampling operation, the reduction motor 2 is controlled to reverse and pull up the sampling barrel 6 to complete a sampling. Repeat the above steps until multiple sampling operations are completed.

[0059] In the process of pulling up the sampling barrel 6, it is detected in real time whether the sampling barrel reaches the initial position, and if so, the reduction motor is controlled to stop working. Similarly, in the process of pulling up the sampling barrel 6, when the position sensor 7 detects the position of the sampling barrel 6, the reduction motor 2 is automatically controlled to stop working. In this way, the reduction motor 2 can be automatically stopped, the control is more accurate, and it is conducive to automatic control.

[0060] In summary, the grease sampling method in the oil tank provided by the embodiment of the present application is to lower the sampling barrel 6 by controlling the reduction motor 2 to drive the winding wheel to rotate, and the suspension rope 31 is connected to the sampling barrel 6 after passing through the fixed pulley 4 with the tension sensor 2, and the sampling barrel 6 can be lowered and pulled up by controlling the reduction motor 2, thereby reducing labor intensity and improving work efficiency. In addition, the sampling position can be accurately determined according to the detected grease height, and the subsequent reduction motor can also accurately send the sampling barrel to the sampling position, thereby improving the accuracy of grease sampling.

Claims

1. A method for detecting the grease height in an oil tank, characterized in that: The method comprises: The sampler is placed above the oil tank opening, the sampler comprises a frame, and a reduction motor, a winding wheel and a fixed pulley arranged on the frame, the winding wheel is connected to the rotating shaft of the reduction motor by transmission, the hanging rope on the winding wheel is connected to the plumb bob through a hook after passing through the fixed pulley, and the fixed pulley is connected to the frame through a tension sensor; Control the reduction motor to drive the winding wheel to rotate, so that the plumb bob drops at a constant speed from the initial position, and obtain the pressure value detected by the tension sensor in real time when the plumb bob drops; The starting time when the plumb bob contacts the liquid surface and the ending time when the plumb bob contacts the tank bottom are determined based on the pressure value, and the descending length of the suspension rope between the starting time and the ending time is determined. The descending length is the grease height in the oil tank.

2. The method for detecting the grease level in an oil tank according to claim 1, characterized in that: Determining the starting time when the plumb bob contacts the liquid surface and the ending time when the plumb bob contacts the tank bottom according to the pressure value specifically includes: The absolute pressure difference between the current moment and the previous moment is obtained in real time. When the absolute pressure difference is greater than a first preset value, the corresponding moment is used as the starting moment. When the absolute pressure difference is greater than a second preset value, the corresponding moment is used as the end moment. The second preset value is greater than the first preset value.

3. The method for detecting the grease level in an oil tank according to claim 1, characterized in that: Determining the descending length of the suspension rope between the starting time and the end time specifically includes: The number of revolutions of the reduction motor between the starting time and the end time is determined, and the descending length of the suspension rope is determined according to the number of revolutions.

4. The method for detecting the grease level in an oil tank according to claim 1, characterized in that: The method further comprises: After determining the end point moment when the plumb bob contacts the tank bottom, the reduction motor is controlled to reverse and the plumb bob is recovered. During the recovery process, it is detected in real time whether the plumb bob has reached the initial position. If so, the reduction motor is controlled to stop working.

5. The method for detecting the grease level in an oil tank according to claim 1, characterized in that: The method further comprises: An oil scraper chuck is arranged on the frame. The lifting rope passes through the fixed pulley, passes through the oil scraper chuck and is connected to the plumb bob. The oil scraper chuck is used to scrape off grease on the surface of the lifting rope.

6. The method for detecting the grease level in an oil tank according to claim 1, characterized in that: The hanging rope is a measuring tape.

7. The method for detecting the grease level in an oil tank according to claim 1, characterized in that: The method further comprises: arranging a control panel on the frame, controlling the reduction motor through the control panel, and sending the grease height in the oil tank to the control panel for display.

8. A method for sampling grease in an oil tank, characterized in that: The method comprises the steps of the method for detecting the grease level in the oil tank according to any one of claims 1 to 7, and further comprises: A plurality of sampling positions of the grease in the oil tank are determined according to the height of the grease in the oil tank, and after the plumb bob is replaced with a sampling barrel, the sampling operation is performed according to the sampling positions.

9. The method for sampling grease in an oil tank according to claim 8, wherein the sampling operation is performed according to the sampling position, specifically comprising: Determine the number of rotations of the reduction motor corresponding to each sampling position, and control the reduction motor to drive the winding wheel to rotate according to the number of rotations, so that the sampling barrel drops from the initial position. When the sampling barrel reaches the sampling position, control the reduction motor to reverse, pull up the sampling barrel, and complete the sampling operation.

10. The method for sampling grease in an oil tank according to claim 9, characterized in that: The method further comprises: During the process of pulling up the sampling barrel, it is detected in real time whether the sampling barrel reaches the initial position, and if so, the reduction motor is controlled to stop working.

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