A weighing device for determining the volatile content of lubricating oil for vehicles

Abstract

The application relates to the technical field of lubricating oil volatile matter determination, in particular to a weighing device for determining the volatile matter of lubricating oil for vehicles, which comprises a sealed weighing cabin and a sample transfer mechanism. A gas adjusting assembly is arranged in the sealed weighing cabin and used for controlling humidity and oxygen content; the sample transfer mechanism realizes automatic switching of a sample dish between a heating and weighing area through a sliding rail and a driving motor; and an anti-static coating is arranged in an electronic balance to ensure weighing accuracy. The device avoids the problems of moisture absorption and oxidation of the sample exposed to air, simplifies operation steps, improves test efficiency and accuracy, and solves the problems of complicated weighing links and environmental interference in the prior art.

Description

Technical Field

[0001] This utility model belongs to the technical field of analytical testing equipment, specifically a weighing device for determining the volatile components of automotive lubricating oil. Background Technology

[0002] In the determination of volatile matter content in lubricating oils, volatile matter is one of the important indicators for measuring its high-temperature stability and service life. Currently, the Noake method is widely used both domestically and internationally. This method involves placing the lubricating oil sample at a specified temperature for a certain period of time for constant evaporation and calculating the percentage of evaporation loss based on the difference in mass before and after the evaporation. However, in the weighing process, the existing operation usually relies on manual use of an analytical balance, which has certain problems: the lubricating oil sample needs to be cooled to room temperature after high-temperature treatment before weighing. If the sample is exposed to air for too long during this process, it may absorb moisture or oxidize, thus affecting the accuracy of the weighing; in addition, the test requires two weighings (before heating and after heating), and each weighing requires opening and closing the balance door and placing / removing the sample dish, which involves many steps and is time-consuming.

[0003] Therefore, we have made improvements to this and proposed a weighing device for determining the volatile content of automotive lubricating oil. Utility Model Content

[0004] The purpose of this invention is to solve the problems of moisture absorption and oxidation caused by exposure to air during the weighing process in the determination of volatile matter in lubricating oil, as well as the cumbersome operation steps.

[0005] To achieve the aforementioned objectives and address the aforementioned problems, this utility model provides a weighing device for determining the volatile components of automotive lubricating oil, comprising a sealed weighing chamber and a sample transfer mechanism. The sealed weighing chamber is equipped with a gas regulation component to control the humidity and oxygen content within the chamber. The sample transfer mechanism penetrates the wall of the sealed weighing chamber and extends into the chamber, achieving automatic switching of the sample dish between the heating and weighing areas via mechanical linkage. An electronic balance is installed on the top of the sealed weighing chamber, with its weighing platform located inside the chamber for precise weighing of the sample dish.

[0006] The sealed weighing chamber includes a chamber body and a sealed door. The chamber body has a double-layer structure, with the outer layer made of metal and the inner layer wrapped with high-temperature resistant insulation material to reduce the impact of external temperature fluctuations on the internal environment. The sealed door is connected to one side of the chamber body by a hinge, and a flexible sealing strip is embedded in the edge of the sealing door, forming an airtight connection with the contact surface of the chamber body. The bottom of the chamber body is provided with a gas inlet and a gas outlet. The gas inlet is used to introduce inert gas or dry air, and the gas outlet is used to discharge the gas inside the chamber, thereby realizing the replacement of the gas inside the chamber.

[0007] The gas regulation assembly includes a gas flow controller and a humidity sensor. The gas flow controller is installed at the gas inlet to regulate the gas flow rate entering the chamber. The humidity sensor is fixed to the inner wall of the chamber to monitor the humidity inside the chamber in real time. The gas regulation assembly also includes an oxygen concentration detector, the probe of which is embedded in the inner wall of the chamber to detect the oxygen content inside the chamber. When the oxygen content exceeds a preset range, the gas flow controller automatically increases the input of inert gas to reduce the oxygen content inside the chamber.

[0008] The sample transfer mechanism includes a slide rail, a slider, and a drive motor. The slide rail is fixed to the bottom of the chamber, and its two ends extend to the heating area and the weighing area, respectively. The slider engages with the slide rail via a groove, and a sample tray is provided on the top of the slider for placing sample dishes. The drive motor is installed outside the chamber, and its output shaft is connected to the slider via a coupling. The forward and reverse rotation of the drive motor drives the slider to move along the slide rail, thereby enabling the sample tray to switch between the heating area and the weighing area.

[0009] The electronic balance includes a weighing platform and a data transmission module. The weighing platform is fixed on a bracket inside the sealed weighing chamber, and the bracket is connected to the inner wall of the chamber by bolts. The data transmission module is connected to an external display device via a cable to transmit weighing data to the display device in real time. The surface of the weighing platform is coated with an antistatic coating to prevent interference from electrostatic weighing results.

[0010] The sample tray has a positioning pin at the bottom, which engages with the positioning hole at the top of the slider to ensure the stability of the sample tray on the slider. The sample tray is surrounded by a barrier, which is slightly higher than the sample dish to prevent the sample dish from tipping over during movement. The bottom of the sample tray also has a vent hole that connects the bottom of the sample dish to the gas inside the chamber to ensure that the heat of the sample dish can be dissipated evenly during the cooling process.

[0011] The drive motor is equipped with a protective cover made of metal. The inner wall of the protective cover is lined with sound-absorbing cotton to reduce the noise generated by the drive motor during operation. The protective cover is fixed to the outer wall of the cabin with screws. The bottom of the protective cover is provided with heat dissipation holes, and the heat dissipation holes are embedded with filters to prevent dust from entering the interior of the protective cover.

[0012] The slide rail is equipped with buffer pads at both ends, which are made of elastic material. When the slider moves to both ends of the slide rail, the buffer pads absorb the impact force of the slider, preventing damage to the slide rail or slider due to impact. The slide rail is equipped with a position sensor in the middle, which is connected to the control module of the drive motor through a signal line. When the slider reaches the designated position, the position sensor sends a signal, and the drive motor stops running.

[0013] The inner wall of the chamber is equipped with lighting lamps, which are connected to an external power source via wires to provide illumination when there is insufficient light inside the sealed weighing chamber. The outer side of the lighting lamps is equipped with a transparent protective cover made of high-temperature resistant glass to prevent the lighting lamps from being damaged by high temperatures.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] In the scheme of this application:

[0016] By setting up a sealed weighing chamber and sample transfer mechanism, the sample dish can be cooled and weighed without being exposed to air after heating, effectively avoiding the risks of sample moisture absorption, oxidation, and contamination. The gas conditioning component monitors and adjusts the environmental parameters inside the chamber in real time to ensure that the weighing process is always in a stable low-humidity, low-oxygen environment, improving the accuracy of the weighing results. The sample transfer mechanism realizes automatic switching of the sample dish between the heating area and the weighing area through mechanical linkage, simplifying the operation steps and shortening the test time. In addition, the antistatic coating of the electronic balance and the buffer design of the slide rail further enhance the stability and reliability of the device, solving the problems of exposure to air, cumbersome operation, and long time consumption in the weighing process in the prior art. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2 This is a cross-sectional view of the sealed weighing chamber.

[0019] Figure 3 This is a schematic diagram of the sample transfer mechanism.

[0020] Figure 4 This is a magnified view of a portion of an electronic balance.

[0021] Figure 5 This is a detailed view of a section of the cabin's internal wall.

[0022] The attached figures are labeled as follows:

[0023] 1. Sealed weighing chamber; 2. Electronic balance; 3. Sample transfer mechanism; 4. Gas conditioning assembly; 5. Chamber body; 6. Sealed door; 7. Slide rail; 8. Slider; 9. Drive motor; 10. Sample tray; 11. Weighing platform; 12. Gas inlet; 13. Gas outlet; 14. Humidity sensor; 15. Oxygen concentration detector; 16. Lighting lamp; 17. Transparent protective cover. Detailed Implementation

[0024] This utility model provides a weighing device for determining the volatile content of automotive lubricating oil, the overall structure of which is as follows: Figure 1As shown, the system includes a sealed weighing chamber 1, an electronic balance 2, a sample transfer mechanism 3, and a gas conditioning assembly 4. The sealed weighing chamber 1 consists of a chamber body 5 and a sealing door 6. The chamber body 5 has a double-layer structure; the outer layer is made of metal, and the inner layer is wrapped with high-temperature resistant insulation material to reduce the impact of external temperature fluctuations on the internal environment. The sealing door 6 is hinged to one side of the chamber body 5, and a flexible sealing strip is embedded in the edge of the sealing door 6, forming an airtight connection with the contact surface of the chamber body 5. A gas inlet 12 and a gas outlet 13 are provided at the bottom of the chamber body 5. The gas inlet 12 is used to introduce inert gas or dry air, and the gas outlet 13 is used to discharge the gas inside the chamber, thereby achieving gas replacement. The positional relationship between the gas inlet 12 and the gas outlet 13 is as follows: Figure 2 As shown, the gas inlet 12 is located on one side of the bottom of the cabin 5, and the gas outlet 13 is located on the other side. The two are diagonally distributed to ensure that the gas flow path covers the entire interior of the cabin.

[0025] The electronic balance 2 is installed on top of the sealed weighing chamber 1, and its weighing platform 11 is fixed to a bracket inside the sealed weighing chamber 1. The bracket is connected to the inner wall of the chamber 5 by bolts. The surface of the weighing platform 11 is coated with an anti-static coating, the specific location of which is as follows: Figure 4 As shown, its function is to prevent interference from electrostatic weighing results. The data transmission module of the electronic balance 2 is connected to an external display device via a cable to transmit weighing data to the display device in real time.

[0026] The sample transfer mechanism 3 penetrates the wall of the sealed weighing chamber 1 and extends into the chamber, its structure as follows: Figure 3As shown, the system includes a slide rail 7, a slider 8, and a drive motor 9. The slide rail 7 is fixed to the bottom of the chamber 5, with its two ends extending to the heating and weighing areas respectively. Both ends of the slide rail 7 are equipped with buffer pads made of elastic material. When the slider 8 moves to either end of the slide rail 7, the buffer pads absorb the impact force of the slider 8, preventing damage to the slide rail 7 or slider 8 due to impact. The slider 8 engages with the slide rail 7 via a groove. A sample tray 10 is located on the top of the slider 8, used to hold sample dishes. A positioning pin is located at the bottom of the sample tray 10, engaging with a positioning hole on the top of the slider 8 to ensure the stability of the sample tray 10 on the slider 8. A surrounding barrier is provided around the sample tray 10, slightly higher than the sample dishes, to prevent the sample dishes from tipping over during movement. A vent is also provided at the bottom of the sample tray 10, connecting the bottom of the sample dishes to the gas inside the chamber, ensuring uniform heat dissipation during the cooling process. The drive motor 9 is installed outside the chamber 5, and its output shaft is connected to the slider 8 via a coupling. The forward and reverse rotation of the drive motor 9 drives the slider 8 to move along the slide rail 7, thereby realizing the switching of the sample tray 10 between the heating area and the weighing area. A position sensor is provided in the middle of the slide rail 7. The position sensor is connected to the control module of the drive motor 9 via a signal line. When the slider 8 reaches the designated position, the position sensor sends a signal, and the drive motor 9 stops running.

[0027] The gas regulation assembly 4 includes a gas flow controller, a humidity sensor 14, and an oxygen concentration detector 15. The gas flow controller is installed at the gas inlet 12 to regulate the gas flow rate entering the chamber 5. The humidity sensor 14 is fixed to the inner wall of the chamber 5 to monitor the humidity inside the chamber in real time. The probe of the oxygen concentration detector 15 is embedded in the inner wall of the chamber 5 to detect the oxygen content inside the chamber. When the oxygen content exceeds a preset range, the gas flow controller automatically increases the input of inert gas to reduce the oxygen content inside the chamber. The distribution of the humidity sensor 14 and the oxygen concentration detector 15 is as follows: Figure 5 As shown, the two are located at different positions on the inner wall of cabin 5 to ensure the comprehensiveness and accuracy of the monitoring data.

[0028] An illumination lamp 16 is installed on the inner wall of the chamber 5. The illumination lamp 16 is connected to an external power source via wires to provide illumination when there is insufficient light inside the sealed weighing chamber 1. A transparent protective cover 17 is installed on the outer side of the illumination lamp 16. The protective cover 17 is made of high-temperature resistant glass to prevent damage to the illumination lamp 16 due to high temperatures. The specific location of the transparent protective cover 17 is as follows... Figure 5 As shown, it fits tightly against the lighting lamp 16 to ensure a protective effect.

[0029] The drive motor 9 is equipped with a protective cover made of metal. The inner wall of the protective cover is lined with sound-absorbing cotton to reduce the noise generated by the drive motor 9 during operation. The protective cover is fixed to the outer wall of the cabin 5 with screws. The bottom of the protective cover has heat dissipation holes with embedded filters to prevent dust from entering the interior of the protective cover.

[0030] In practical use, the sealing door 6 is first opened, and the sample dish containing the lubricating oil sample is placed on the sample tray 10. After closing the sealing door 6, inert gas or dry air is introduced into the chamber 5 through the gas inlet 12. At the same time, the gas flow controller is activated to adjust the gas flow rate, ensuring that the chamber environment reaches a low humidity and low oxygen state. The humidity sensor 14 and the oxygen concentration detector 15 monitor the chamber environment parameters in real time and feed the data back to the gas flow controller. When the oxygen content exceeds the preset range, the gas flow controller automatically increases the input of inert gas to reduce the oxygen content in the chamber. Subsequently, the drive motor 9 starts, driving the slider 8 to move along the slide rail 7, moving the sample tray 10 from the initial position to the heating area for heating treatment. After heating is completed, the drive motor 9 runs in reverse, moving the sample tray 10 to the weighing area. At this time, the sample dish is placed directly on the weighing platform 11, and the electronic balance 2 accurately weighs it, transmitting the weighing data to the external display device through the data transmission module. Throughout the process, the sample dish does not need to be exposed to the air, effectively avoiding the risks of moisture absorption, oxidation, and contamination. In addition, the vent design of the sample tray 10 ensures that the heat of the sample dish can be evenly dissipated during the cooling process, while the design of the enclosure prevents the sample dish from tipping over during movement, further improving the stability and reliability of the device.

[0031] To enable those skilled in the art to fully understand and implement this utility model, the specific implementation principle of this utility model is further supplemented below with a specific application scenario.

[0032] First, during the determination of volatile matter in lubricating oil, the operator opens the sealed door 6 of the enclosed weighing chamber 1 and places the sample dish containing the lubricating oil sample onto the sample tray 10. The sample tray 10 is surrounded by a barrier, slightly higher than the sample dish, effectively preventing the sample dish from tipping over during subsequent movement. The positioning pin at the bottom of the sample tray 10 engages with the positioning hole at the top of the slider 8, ensuring the stability of the sample tray 10 on the slider 8. The sealed door 6 is then closed. At this point, the flexible sealing strip of the chamber 5 forms an airtight connection with the sealed door 6, ensuring complete isolation between the chamber environment and the outside environment.

[0033] Next, inert gas or dry air is introduced into the chamber 5 through gas inlet 12. The gas flow controller adjusts the gas flow rate into the chamber according to preset parameters. Humidity sensor 14 and oxygen concentration detector 15 monitor the environmental parameters inside the chamber in real time and feed the data back to the gas flow controller. If the oxygen content exceeds the preset range, the gas flow controller automatically increases the input of inert gas to reduce the oxygen content inside the chamber, thereby ensuring that the environment inside the chamber reaches a low humidity and low oxygen state. This design effectively avoids the risk of samples absorbing moisture or oxidizing due to exposure to air during cooling and weighing.

[0034] Subsequently, the drive motor 9 starts, moving the slider 8 along the slide rail 7 from its initial position to the heating area. The buffer pads at both ends of the slide rail 7 are made of elastic material. When the slider 8 moves to either end of the slide rail 7, the buffer pads absorb the impact force of the slider 8, preventing damage to the slide rail 7 or the slider 8 due to impact. A position sensor is located in the middle of the slide rail 7. When the slider 8 reaches the designated position in the heating area, the position sensor sends a signal, and the drive motor 9 stops running. At this time, the sample dish completes high-temperature evaporation within the heating area. The vent holes at the bottom of the sample tray 10 connect the bottom of the sample dish to the gas inside the chamber, ensuring that heat is evenly dissipated during the cooling process.

[0035] After heating is complete, the drive motor 9 reverses direction, moving the slider 8 along the slide rail 7 to the weighing area. When the slider 8 reaches the designated position in the weighing area, the position sensor sends a signal again, and the drive motor 9 stops. At this time, the sample dish is placed directly on the weighing platform 11 of the electronic balance 2. The surface of the weighing platform 11 is coated with an antistatic coating to prevent interference from electrostatic weighing results. The electronic balance 2 transmits the weighing data to an external display device in real time via a data transmission module, completing accurate weighing.

[0036] Throughout the entire process, the sample dish remains within the sealed weighing chamber 1, eliminating the need for exposure to air and fundamentally solving the problems of sample moisture absorption, oxidation, and contamination. The chamber 5 features a double-layered structure, with an outer layer made of metal and an inner layer wrapped in high-temperature resistant insulation material, effectively reducing the impact of external temperature fluctuations on the internal environment. Furthermore, the lighting lamps 16 installed on the inner wall of chamber 5 are connected to an external power source via wires to provide illumination in low-light conditions. The transparent protective cover 17 is made of high-temperature resistant glass, ensuring the lighting lamps 16 operate normally in high-temperature environments.

[0037] The inner wall of the outer protective cover of the drive motor 9 is lined with sound-insulating cotton, which reduces the noise generated by the drive motor 9 during operation. The heat dissipation holes at the bottom of the protective cover are fitted with filters to prevent dust from entering the interior of the protective cover, thereby ensuring the long-term stable operation of the drive motor 9.

[0038] Through the above steps, this invention automates the entire process of heating, cooling, and weighing lubricating oil samples, significantly simplifying the operation and shortening the testing time. Meanwhile, the design of each component of the device has been optimized; for example, the vent design ensures uniform cooling of the sample dish, the baffle design prevents the sample dish from tipping over, and the buffer pad design avoids damage from mechanical collisions. These details collectively enhance the stability and reliability of the device.

Claims

1. A weighing device for determining the volatile content of automotive lubricating oil, characterized in that, The system includes a sealed weighing chamber (1), an electronic balance (2), and a sample transfer mechanism (3). The sealed weighing chamber (1) is equipped with a gas conditioning component (4) to control the environmental parameters inside the chamber. The sample transfer mechanism (3) extends through the wall of the sealed weighing chamber (1) and into the chamber, and achieves the switching of the sample dish between the heating area and the weighing area through mechanical linkage. The electronic balance (2) is installed on the top of the sealed weighing chamber (1), and its weighing platform (11) is located inside the sealed weighing chamber (1) for weighing the sample dish.

2. The weighing device for determining the volatile content of automotive lubricating oil according to claim 1, characterized in that, The sealed weighing chamber (1) includes a chamber body (5) and a sealing door (6). The chamber body (5) has a double-layer structure, with the outer layer made of metal material and the inner layer wrapped with high-temperature resistant heat insulation material. The sealing door (6) is connected to one side of the chamber body (5) by a hinge. The edge of the sealing door (6) is embedded with a flexible sealing strip, and the flexible sealing strip forms an airtight connection with the contact surface of the chamber body (5). The bottom of the chamber body (5) is provided with a gas inlet (12) and a gas outlet (13). The gas inlet (12) is used to introduce inert gas or dry air, and the gas outlet (13) is used to discharge the gas inside the chamber.

3. The weighing device for determining the volatile content of automotive lubricating oil according to claim 2, characterized in that, The gas regulation assembly (4) includes a gas flow controller, a humidity sensor (14), and an oxygen concentration detector (15). The gas flow controller is installed at the gas inlet (12) to regulate the gas flow rate entering the chamber (5). The humidity sensor (14) is fixed to the inner wall of the chamber (5) to monitor the humidity inside the chamber in real time. The probe of the oxygen concentration detector (15) is embedded in the inner wall of the chamber (5) to detect the oxygen content inside the chamber.

4. The weighing device for determining the volatile content of automotive lubricating oil according to claim 1, characterized in that, The sample transfer mechanism (3) includes a slide rail (7), a slider (8), and a drive motor (9). The slide rail (7) is fixed to the bottom of the chamber (5) and extends to the heating area and the weighing area at both ends, respectively. The slider (8) is engaged with the slide rail (7) through a slide groove. A sample tray (10) is provided on the top of the slider (8) for placing sample dishes. The drive motor (9) is installed outside the chamber (5), and its output shaft is connected to the slider (8) through a coupling. The forward and reverse rotation of the drive motor (9) drives the slider (8) to move along the slide rail (7).

5. A weighing device for determining the volatile content of automotive lubricating oil according to claim 4, characterized in that, The sample tray (10) is provided with a positioning pin at the bottom, which cooperates with the positioning hole at the top of the slider (8) to ensure the stability of the sample tray (10) on the slider (8); the sample tray (10) is provided with a surrounding barrier, the height of which is higher than that of the sample dish; the sample tray (10) is provided with a vent hole at the bottom, which connects the bottom of the sample dish with the gas inside the chamber.

6. A weighing device for determining the volatile content of automotive lubricating oil according to claim 4, characterized in that, The drive motor (9) is provided with a protective cover, which is made of metal material and has sound insulation cotton attached to the inner wall of the protective cover. The protective cover is fixed to the outer wall of the cabin (5) by screws. The bottom of the protective cover is provided with heat dissipation holes and a filter screen is embedded in the heat dissipation holes.

7. A weighing device for determining the volatile content of automotive lubricating oil according to claim 4, characterized in that, The slide rail (7) has buffer pads at both ends, which are made of elastic material. When the slider (8) moves to both ends of the slide rail (7), the buffer pads absorb the impact force of the slider (8). The slide rail (7) has a position sensor in the middle. The position sensor is connected to the control module of the drive motor (9) through a signal line. When the slider (8) reaches the designated position, the position sensor sends a signal and the drive motor (9) stops running.

8. A weighing device for determining the volatile content of automotive lubricating oil according to claim 2, characterized in that, The inner wall of the cabin (5) is provided with a lighting lamp (16), which is connected to an external power source through a wire; the outer side of the lighting lamp (16) is provided with a transparent protective cover (17), which is made of high temperature resistant glass.

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