A method for weighing filter paper for sampling particulate matter in automobile emission tests

Abstract

The present application belongs to the field of automobile and engine emission test technology, and specifically relates to a method for weighing filter paper for sampling particulate matter in automobile emission test, first inputting the number of test filter papers, the environmental control monitoring module maintains the monitoring of the temperature, humidity and pressure of the weighing environment, controlling the filter paper weighing module to drop the filter paper to the lifting tray for weighing 3 times, the vessel cover opening and closing mechanism opens and closes the vessel, the lifting tray puts the filter paper into the vessel, the data management and processing module records the data, and the vessel is transported to the waiting area; after the test, the vessel is transported to the static area and the waiting area in turn; then the vessel cover opening and closing mechanism pours the filter paper in the waiting area into the lifting tray for weighing, and then puts the test filter paper from the lifting tray into a covered waste box, and the idle vessel is transported to the storage area, and the host control module checks and exports the final data. The present application standardizes the management of covered vessels, saves filter paper weighing time, reduces personnel calculation errors and weighing environmental pollution, improves the accuracy and reliability of filter paper weight data, and speeds up detection efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile and engine emission testing, and in particular relates to a method for weighing filter paper for sampling particulate matter in automobile emission testing. Background Art

[0002] With the rapid development of automobile technology, the environmental problems caused by the derived motor vehicle emission pollutants are becoming more and more serious, especially the particulate matter mass emissions from various types of fuel vehicle engines, referred to as particulate matter emissions, which have caused great harm to the environment and human health. Environmental protection departments and all sectors of society are paying more and more attention to it.

[0003] In the automobile inspection industry, since the third stage of motor vehicle emission standards, requirements have been made for the limit values ​​of particulate matter in automobile emissions. The current standard is the sixth stage (GB 18352.6-2016), which requires the use of filter paper to filter and intercept automobile exhaust, directly collect particulate matter in the exhaust, and obtain the weight of particulate matter in the exhaust of light vehicles by weighing the mass deviation before and after the filter paper, so as to determine whether the weight of particulate matter in the vehicle's exhaust pollutants meets the national standard limit requirements.

[0004] Usually, the weight of the filter paper used to collect particulate matter in the exhaust gas of light vehicles is less than 100 mg, and the weight of the particles collected on the filter paper is at the microgram level. The filter paper has very high requirements for the weighing environment, and the weighing results will change due to fluctuations in ambient temperature, humidity and air pressure. At the same time, the microgram balance used has high accuracy requirements, and slight vibrations in the surrounding environment will cause the measurement stability and service life of the precision instrument.

[0005] At present, the weighing process of particulate matter emitted by light-duty vehicles is as follows:

[0006] One hour before using the filter paper, put the required filter paper into a sealed container with a lid and place it in a weighing box, so that the filter paper is stable in an environment of 20±2℃, dew point temperature <10.5℃, and relative humidity of 45±8%. Then open the screw door of the microgram balance, place the filter paper steadily and evenly on the six-claw antenna of the microgram balance, close the screw door of the microgram balance, and after the microgram balance is stable, manually record the displayed data and take out the filter paper. To reduce the measurement error, repeat the weighing process three times for each filter paper, and take the average of the three times as the weight of the filter paper. The weighed filter paper can be taken for testing. After the test, the filter paper before and after the collection of particles will continue to be placed in a sealed container with a lid and placed in a weighing box. After the particles are stably deposited on the filter paper (about one hour or more), repeat the above weighing operation steps again, and take the average of three times to obtain the weight of the filter paper with particles. The weight of the filter paper before and after sampling is processed to obtain the final weight of the particles. In this weighing process, there are the following defects:

[0007] 1. It takes a long time. During the entire weighing process, it is necessary to wait for the filter paper to stabilize several times before the weighing operation can be carried out. During the weighing operation, the placement of the filter paper, the opening and closing of the microgram balance knob, the pressure difference between the inside and outside of the knob, and the operation of the temperature and humidity control system in the weighing box will cause mechanical vibration. Each weighing requires a period of time for the reading to stabilize, which seriously affects the efficiency of the test.

[0008] 2. Weighing operation requires a period of training; when placing the filter paper on the microgram balance, each antenna needs to bear a similar weight, otherwise it will affect the stability of the microgram balance. Frequent internal adjustments will affect the service life of the microgram balance and test the operator's skills.

[0009] 3. There is pollution, which affects the accuracy of the data. During manual operation, the weighing channel of the weighing box will be opened, and some dust in the environment will enter the weighing box. The swing gate of the microgram balance has a large opening. When it is opened, it mixes with the air in the weighing box, and some particles enter the swing gate of the microgram balance. When placing the filter paper with tweezers, the tip of the tweezers will scrape some particles on the filter paper into the swing gate of the microgram balance. Both will cause pollution to the weighing environment of the microgram balance, thereby affecting the accuracy of the weighing results.

[0010] 4. The management of the vessels is in disarray. The filter paper needs to be placed in a sealed container with a lid one hour before use. After the test, the filter paper that has collected the particles needs to be placed back in a sealed container with a lid, soaked for a period of time, and weighed again. When multiple tests are carried out, there will be a phenomenon of filter paper being placed in the wrong vessel and being in disarray, and personnel are required to regularly clean the vessels that have been weighed.

[0011] 5. The data needs to be corrected manually later; when the sampling filter paper is weighed, the filter paper is in the medium (air). Because its own weight is very small and the weighing accuracy is high, its final weight is greatly affected by the buoyancy of the air. According to the requirements of standard GB18352.6-2016, it is necessary to record the temperature, humidity and pressure of the weighing environment to correct the buoyancy of the filter paper. This operation requires manual data processing again later. Summary of the invention

[0012] In view of the defects of the prior art, the present invention proposes a method for weighing filter paper for sampling particulate matter in automobile emission tests, which standardizes the management of sealed covered vessels, strengthens the stability of microgram balances, saves filter paper weighing time, reduces personnel calculation errors and pollution of the weighing environment, improves the accuracy and reliability of filter paper weight data, and accelerates detection efficiency.

[0013] In order to achieve the technical purpose of the present invention, the present invention will adopt the following technical solutions:

[0014] A method for weighing filter paper for sampling particulate matter in automobile emission tests, the weighing method comprising a host control module, a data management and processing module, a filter paper weighing module and a vessel transport module; the host control module is used to monitor and control the temperature, humidity and pressure of the weighing environment, receive input commands and control the operation of other modules, and can query and output filter paper data, including an interaction module, an environment monitoring module, an environment control module, a tray control module, a vessel transport control module and a display screen; the data management and processing module is used to receive signals transmitted from a microgram balance and a vessel module, correspond the filter paper weight to the vessel number stored therein and the temperature, humidity and pressure in the environment during weighing and store them one by one, and automatically record the time when the vessel with the particulate filter paper is placed in the vessel transport module , when the preset time is reached, the signal is transmitted to other modules, the filter paper weighing is started, the filter paper weight, the ambient temperature and humidity, dew point and pressure during weighing are recorded, the data is automatically corrected for buoyancy, and the mass of particulate matter collected by the filter paper in the vessel number is calculated; the filter paper weighing module is used to weigh the pure filter paper before the test and the filter paper after the test, including a filter paper box, a lifting tray and a microgram balance; the vessel transport module is used to transport the filter paper that meets the test conditions and has been weighed to the storage area and the waiting area in sequence, and to transport the filter paper after the test to the static area and then to the waiting area for static placement, including a conveying device assembly, a vessel box with a cover, a vessel cover opening and closing mechanism and a waste box with a cover, and the conveying device assembly has a storage area, a waiting area, a static area and a waiting area;

[0015] The weighing method comprises the following steps:

[0016] Step 1: Input command; the tester inputs the number of filter papers required for the test on the host control module according to the test requirements;

[0017] Step 2: Weighing environment detection; the environment control module in the host control module maintains the temperature and humidity in the entire weighing environment, and the environment control module monitors whether the weighing environment meets the requirements. If the requirements are met, the filter paper of the filter paper weighing module falls to the lifting tray;

[0018] Step 3: Weigh the clean filter paper; after the filter paper falls onto the lifting tray, the lifting tray slowly falls down and is placed steadily on the microgram balance. After the reading is stable, the data is stored in the data management and processing module through the signal. Then the lifting tray rises and falls down again to the microgram balance for weighing. Each piece of filter paper is weighed three times in the same way as above;

[0019] Step 4: Allocate vessels; after the clean filter paper is weighed, the vessel cover opening and closing mechanism of the storage area of ​​the vessel transport module opens the lid of the covered vessel box, the lifting tray puts the filter paper into the covered vessel box allocated by the vessel transport module, the vessel cover opening and closing mechanism buckles the lid of the covered vessel box, the data management and processing module matches the number of the covered vessel box with the filter paper data, and the vessel transport module transports the covered vessel box containing the clean filter paper to the waiting area of ​​the vessel transport module;

[0020] Step 5: Vessel recovery; the test personnel put the covered vessel box containing the filter paper after the test into the designated area of ​​the vessel transport module, and the vessel transport module transports it to the static area. The data management and processing module records the vessel number and the time when the vessel is placed. After the set static time is reached, the vessel transport module transports it to the waiting area for weighing;

[0021] Step 6: Weigh the filter paper after the test; the vessel cover opening and closing mechanism opens the lid of the covered vessel box based on the preset time and pours the filter paper into the lifting tray, and the idle covered vessel box is transported to the storage area by the conveying device assembly to wait for the next clean filter paper to be put in, and the filter paper weighing module repeats step 3;

[0022] Step 7: Calculation and query; After weighing, the filter paper with particles is placed into a waste box with a cover by the lifting tray. The data management and processing module records and corrects the data, calculates the weight of the particles, and transmits the data to the control module. The test personnel view and export the final data through the host control module.

[0023] Furthermore, it is characterized in that the interactive module is used to input the required number of filter paper sheets and query the filter paper data according to time and vessel number.

[0024] Furthermore, the environment monitoring module is used to automatically record the temperature, humidity, dew point and pressure data in the weighing environment at a certain frequency, and when the monitored data exceeds a preset range, the environment control module is started.

[0025] Furthermore, the environment control module is used to control the temperature and humidity in the weighing environment to maintain a constant and stable state, and to detect whether the weighing environment meets the preset environmental conditions. When the preset environmental conditions are met, a paper output instruction is issued to the filter paper weighing module.

[0026] Furthermore, the tray control module is used to control the filter paper weighing module to place the clean filter paper in an empty covered vessel box in the storage area of ​​the vessel transport module.

[0027] Furthermore, the vessel transport control module is used to open or close the covered vessel box in the vessel transport module, and control the vessel transport module to transport the covered vessel box before the test to the storage area and the waiting area in sequence, transport the covered vessel box after the test to the static area and the weighing area in sequence, and recycle the filter paper after the test weighing.

[0028] Furthermore, the conveying device assembly includes a first conveying device, a second conveying device and a transition transmission device; the first conveying device and the second conveying device are connected through the transition transmission device; the storage area and the waiting area are arranged on the first conveying device, and the static area and the waiting area are arranged on the second conveying device.

[0029] Furthermore, the transition transmission device is used to transport the empty covered container boxes after weighing in the waiting area of ​​the second conveying device to the storage area of ​​the first conveying device, and the empty covered container boxes in the storage area are used to place clean filter paper; the first conveying device is used to transport the covered container boxes containing clean filter paper to the waiting area, and the covered container boxes in the waiting area are used for testing; the second conveying device is used to transport the covered container boxes containing filter paper after the test to the standing area, and then transport them to the waiting area after standing.

[0030] Furthermore, the weighing environment is provided with a first window and a second window, and the first window and the second window are respectively arranged in a waiting area of ​​the first conveying device and a static area of ​​the second conveying device.

[0031] Furthermore, there are a plurality of container boxes with lids, each of which is numbered; the top of the microgram balance is provided with a plurality of tentacles for placing a lifting tray, and the bottom is provided with a rubber gasket.

[0032] The beneficial effects of the present invention are:

[0033] First, the present invention saves time and improves the test efficiency; the filter paper in the weighing method has been placed in a stable environment and can be taken out at any time, without the need to place the filter paper in the weighing box one hour in advance; the microgram balance adopts a number of shock-absorbing and shock-proof measures, which greatly reduces the waiting time for the microgram balance to stabilize; buoyancy correction and filter paper particle weight calculation are automatically performed, and parameters can be directly queried when needed, saving manual calculation time and improving the detection efficiency;

[0034] Second, it reduces the internal structure adjustment of the microgram balance, improves the measurement accuracy of the filter paper, reduces manual operation errors and damage and service life; the tray used in this weighing method is stably placed on the microgram balance tentacles, each tentacles is evenly stressed, and the platform where the microgram balance is located is independent of other modules in the weighing box, and is not affected by the vibration generated by other modules during operation, thereby reducing the vibration of the internal structure; a rubber gasket is configured at the bottom of the microgram balance to buffer the inevitable vibration;

[0035] Third, strengthen data management and improve data recording and call efficiency; the weighing method is that the data management and processing module automatically matches the vessel number with the filter paper weight, and can record the environmental parameters during weighing, perform buoyancy correction and related calculations of the weight before and after the filter paper, with less manual intervention. It only needs to input the required number of filter papers according to the needs, and take or return the filter paper vessel in the corresponding area. The rest is controlled by the system module, and the vessel has high circulation and utilization rate, and low error rate;

[0036] Fourth, it avoids pollution of the weighing environment and has high data reliability. In this weighing method, the weighing environment is almost not in contact with the external environment, thus avoiding pollution of the weighing area by the external environment. The filter papers with particulate matter are weighed after being immersed and stabilized, and the vibration is small during the weighing operation, so there is no pollution to the weighing environment. The used filter papers are placed in a covered waste box, and multiple settings fully avoid pollution of the weighing environment and affect the accuracy of the data, so the obtained data has high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a flow chart of a method for weighing filter paper for sampling particulate matter in an automobile emission test according to an embodiment of the present invention;

[0038] Figure 2 It is a motion trajectory diagram of a covered container box in a method for weighing filter paper for sampling particulate matter in an automobile emission test according to an embodiment of the present invention;

[0039] Figure 3 The present invention is a schematic diagram of the system structure of a method for weighing filter paper for sampling particulate matter in an automobile emission test according to an embodiment of the present invention.

[0040] Among them, 1-the first conveying device; 2-the vessel cover opening and closing mechanism; 3-the vessel box with cover; 4-the first window; 5-the microgram balance; 6-the second conveying device; 7-the waste box with cover; 8-the second window; 9-the guide rail; 10-the filter paper box; 11-the lifting tray. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the technical solution of the present application, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0042] The terms such as up, down, left, right, front and back in this application document are based on the positional relationships shown in the drawings. If the drawings are different, the corresponding positional relationships may also change accordingly, so they cannot be understood as limiting the scope of protection.

[0043] In this application, the terms "install", "connected", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, or mutual communication, a direct connection, or an indirect connection through an intermediate medium, the internal connection of two components, or the interaction relationship between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] Embodiment 1:

[0045] Refer to the instruction manual Figure 1-2 A method for weighing filter paper for sampling particulate matter in automobile emission tests, the weighing method comprises four modules, namely a host control module, a data management and processing module, a filter paper weighing module and a vessel transportation module, the host control module, the data management and processing module, the filter paper weighing module and the vessel transportation module are all arranged in a weighing box.

[0046] The host control module is used to monitor and control the temperature, humidity and pressure of the weighing environment, receive input commands and control the operation of other modules. It can query and output filter paper data, including the interactive module, environmental monitoring module, environmental control module, tray control module and vessel transport control module.

[0047] Specifically, the interactive module is used to input the required number of filter paper sheets and query the filter paper data according to the time and the vessel number. The environmental monitoring module is used to automatically record the temperature, humidity, dew point and pressure data in the weighing environment at a certain frequency. When the monitored data exceeds the preset range, the environmental control module is started. The interactive module has an alarm function. When the clean filter paper is about to run out or the waste box is about to be full, the temperature control system needs to be replenished with water, etc., the alarm will be automatically alarmed. The environmental control module is used to control the temperature and humidity in the weighing box to maintain a constant and stable state, receive filter paper weighing instructions, and detect whether the weighing area meets the environmental preset conditions. After the environmental preset conditions are met, the paper output instruction is issued to the filter paper weighing module. The tray control module is used to control the filter paper weighing module to place the clean filter paper in the idle covered vessel box of the vessel transport module. The vessel transport control module is used to control the covered vessel box in the control vessel transport module to open or close, and control the vessel transport module to transport the covered vessel boxes before and after the test to the designated area, and recycle the filter paper after the test weighing.

[0048] The data management and processing module is used to receive signals transmitted from the microgram balance and the vessel module, match and store the filter paper weight with the vessel number in which it is stored and the temperature, humidity and pressure in the environment during weighing, automatically record the time when the vessel with the filter paper containing particulate matter is placed in the transmission module, and when the preset time is reached, transmit the signal to other modules to start the filter paper weighing, record the filter paper weight, the environmental temperature, humidity, dew point and pressure during weighing, automatically perform buoyancy correction on the data, and calculate the mass of particulate matter collected by the filter paper in the vessel number.

[0049] The filter paper weighing module is used to weigh the pure filter paper before the test and the filter paper after the test, including the filter paper box, lifting tray and microgram balance.

[0050] The vessel transport module is used to transport the filter paper that meets the test conditions and has been weighed to the waiting area, and to transport the tested filter paper to the waiting area for standing and then continue to transport it to the filter paper weighing module, a conveying device assembly, a vessel box with a cover, a vessel cover opening and closing mechanism and a waste box with a cover. The conveying device assembly has a storage area, a waiting area, a standing area and a waiting area.

[0051] The method for weighing filter paper for sampling particulate matter in automobile emission tests includes the following steps:

[0052] Step 1: Input command; the tester inputs the number of filter papers required for the test on the host control module according to the test requirements.

[0053] Step 2: Weighing environment detection; the environment control module in the host control module maintains the temperature and humidity in the entire weighing box. The environment control module monitors whether the weighing environment meets the requirements. If the requirements are met, the filter paper of the filter paper weighing module falls to the lifting tray.

[0054] Step 3: Weigh the clean filter paper; after the filter paper falls onto the lifting tray, the lifting tray slowly falls down and is placed steadily on the microgram balance. After the indication stabilizes, the data is stored in the data management and processing module through the signal. Then the lifting tray rises and falls down again to the microgram balance for weighing. Each piece of filter paper is weighed three times in the same way as above.

[0055] Step 4: Allocate vessels; after the clean filter paper is weighed, the vessel cover opening and closing mechanism of the storage area of ​​the vessel transport module opens the lid of the covered vessel box, the lifting tray puts the filter paper into the covered vessel box allocated by the vessel transport module, the vessel cover opening and closing mechanism buckles the lid of the covered vessel box, the data management and processing module matches the number of the covered vessel box with the filter paper data, and the vessel transport module transports the covered vessel box containing the clean filter paper to the waiting area of ​​the vessel transport module.

[0056] Step 5: Vessel recovery; the test personnel put the covered vessel box containing the filter paper after the test into the designated area of ​​the vessel transport module. The vessel transport module transports it to the static area. The data management and processing module records the vessel number and the time when the vessel is placed. After the set static time is reached, the vessel transport module transports it to the weighing area.

[0057] Step 6: After the test, the filter paper is weighed; the vessel cover opening and closing mechanism opens the lid of the covered vessel box based on the preset time and pours the filter paper into the lifting tray. The idle covered vessel box is transported to the storage area by the conveying device assembly to wait for the next clean filter paper to be put in, and the filter paper weighing module repeats step 3.

[0058] Step 7: Calculation and query; After weighing, the filter paper with particles is placed into a waste box with a cover by the lifting tray. The data management and processing module records and corrects the data, calculates the weight of the particles, and transmits the data to the control module. The test personnel view and export the final data through the host control module.

[0059] It should be noted that the buoyancy correction of the weight of the weighed filter paper in step 3 and step 7 is in accordance with the requirements of GB18352.6-2016. The buoyancy correction of the filter paper mass is performed based on the temperature and air pressure values ​​in the weighing box collected each time the particle filter paper is weighed, and the buoyancy coefficient is corrected using the buoyancy correction formula to calculate the corrected filter paper weight. The buoyancy correction depends on the density of the filter paper itself, the air density, and the density of the standard weight for calibrating the balance. The buoyancy correction formula is as follows:

[0060]

[0061] Where:

[0062] m f Indicates the weight of the corrected particle filter paper, unit: mg;

[0063] m u Indicates the weight of particle filter paper before correction, unit: mg;

[0064] ρ a Indicates the local air density, unit: kg / m3;

[0065] ρ w Indicates the density of the reference weight, unit: kg / m3;

[0066] ρ f Indicates the density of the filter paper itself, unit: kg / m3;

[0067] P b Indicates atmospheric pressure, unit: kPa;

[0068] M min Indicates the molar mass of air;

[0069] T a Indicates the air temperature inside the weighing box, unit: K;

[0070] R represents the molar gas constant.

[0071] Based on the above weighing method, the data of two groups of filter papers before and after the test were obtained:

[0072]

[0073]

[0074] Embodiment 2:

[0075] Refer to the instruction manual Figure 3 The present invention provides a weighing system for a method of weighing filter paper for sampling particulate matter in an automobile emission test, comprising a first conveying device 1, a vessel cover opening and closing mechanism 2, a vessel box with a cover 3, a first window 4; a microgram balance 5, a second conveying device 6, a waste box with a cover 7, a second window 8, a guide rail 9, a filter paper box 10, a lifting tray 11 and a transition transmission device.

[0076] The filter paper box 10 is used to store clean filter paper. The filter paper box 10 has an automatic paper discharging function and receives instructions from the environment control module of the host control module to discharge paper. The lifting tray 11 moves along the guide rail 9. The lifting tray 11 has a flipping function and is used to carry the clean filter paper dropped from the filter paper box 10. Based on the tray control module, the clean filter paper is placed in the idle covered container box 3 of the container transport module, and the filter paper after the test delivered by the container transport module is delivered to the microgram balance 5 for weighing. The microgram balance 5 has multiple tentacles. The lifting tray 11 is placed on the tentacles of the microgram balance 5. Each tentacle is evenly stressed. The bottom of the microgram balance 5 has a rubber gasket. The microgram balance 5 is used to weigh the clean filter paper before the test and the filter paper after the test, and input the weighing information into the data management and processing module.

[0077] The first conveying device 1 and the second conveying device 6 are connected by a transition transmission device, and the transition transmission device is used to transport the idle covered container box 3 in the second conveying device 6 to the storage area of ​​the first conveying device 1. The first conveying device 1 has a storage area and a waiting area, which are used to transport the covered container box 3 containing clean filter paper to the waiting area, and the idle covered container box 3 is placed in the storage area. The second conveying device 6 has a static area and a waiting area for weighing, and the second conveying device 6 is used to transport the covered container box 3 containing post-test filter paper to the static area and then transport it to the waiting area for weighing after static. The first window 4 and the second window 8 are respectively arranged in the waiting area of ​​the first conveying device 1 and the waiting area of ​​the second conveying device 6, and the first window 4 and the second window 8 open and close automatically.

[0078] There are multiple covered container boxes 3, each of which is numbered, so that the interactive module can query the filter paper data of each covered container box 3 based on the number. The container cover opening and closing mechanism 2 is used to open and close the container boxes 3 on the first conveying device 1 and the second conveying device 6 to prevent the clean filter paper from being contaminated. The container cover opening and closing mechanism 2 has the functions of flipping, closing and turning. The container cover opening and closing mechanism 2 is arranged in the storage area and the waiting area. The container cover opening and closing mechanism 2 in the waiting area pours the filter paper in the opened container box 3 into the lifting tray 11 through the turning action. The discarded container 7 with a cover is used to place the filter paper after the test weighing conveyed by the filter paper weighing module.

[0079] The above is only an embodiment of the present invention, and the common sense such as the known specific structure and characteristics in the scheme is not described in detail here. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the attached claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. A method for weighing filter paper for sampling particulate matter in automobile emission tests, characterized in that: The weighing method comprises a host control module, a data management and processing module, a filter paper weighing module and a vessel transport module; the host control module is used to monitor and control the temperature, humidity and pressure of the weighing environment, receive input commands and control the operation of other modules, and can query and output filter paper data, including an interactive module, an environmental monitoring module, an environmental control module, a tray control module, a vessel transport control module and a display screen; the data management and processing module is used to receive signals transmitted from a microgram balance and a vessel module, correspond the filter paper weight to the vessel number stored therein and the temperature, humidity and pressure in the environment during weighing and store them one by one, automatically record the time when the vessel with the filter paper containing particles is placed in the vessel transport module, and when the preset time is reached, The signal is transmitted to other modules to start the filter paper weighing, record the filter paper weight, the ambient temperature and humidity, dew point and pressure during weighing, automatically perform buoyancy correction on the data, and calculate the mass of particulate matter collected by the filter paper in the vessel number; the filter paper weighing module is used to weigh the pure filter paper before the test and the filter paper after the test, including a filter paper box, a lifting tray and a microgram balance; the vessel transport module is used to transport the filter paper that meets the test conditions and has been weighed to the storage area and the waiting area in sequence, and to transport the filter paper after the test to the static area and then to the waiting area for static placement, including a conveying device assembly, a vessel box with a cover, a vessel cover opening and closing mechanism and a waste box with a cover, and the conveying device assembly has a storage area, a waiting area, a static area and a waiting area; The weighing method comprises the following steps: Step 1: Input command; the tester inputs the number of filter papers required for the test on the host control module according to the test requirements; Step 2: Weighing environment detection; the environment control module in the host control module maintains the temperature and humidity in the entire weighing environment, and the environment control module monitors whether the weighing environment meets the requirements. If the requirements are met, the filter paper of the filter paper weighing module falls to the lifting tray; Step 3: Weigh the clean filter paper; after the filter paper falls onto the lifting tray, the lifting tray slowly falls down and is placed steadily on the microgram balance. After the reading is stable, the data is stored in the data management and processing module through the signal. Then the lifting tray rises and falls down again to the microgram balance for weighing. Each piece of filter paper is weighed three times in the same way as above; Step 4: Allocate vessels; after the clean filter paper is weighed, the vessel cover opening and closing mechanism of the storage area of ​​the vessel transport module opens the lid of the covered vessel box, the lifting tray puts the filter paper into the covered vessel box allocated by the vessel transport module, the vessel cover opening and closing mechanism buckles the lid of the covered vessel box, the data management and processing module matches the number of the covered vessel box with the filter paper data, and the vessel transport module transports the covered vessel box containing the clean filter paper to the waiting area of ​​the vessel transport module; Step 5: Vessel recovery; the test personnel put the covered vessel box containing the filter paper after the test into the designated area of ​​the vessel transport module, and the vessel transport module transports it to the static area. The data management and processing module records the vessel number and the time when the vessel is placed. After the set static time is reached, the vessel transport module transports it to the waiting area for weighing; Step 6: Weigh the filter paper after the test; the vessel cover opening and closing mechanism opens the lid of the covered vessel box based on the preset time and pours the filter paper into the lifting tray, and the idle covered vessel box is transported to the storage area by the conveying device assembly to wait for the next clean filter paper to be put in, and the filter paper weighing module repeats step 3; Step 7: Calculation and query; After weighing, the filter paper with particles is placed into a waste box with a cover by the lifting tray. The data management and processing module records and corrects the data, calculates the weight of the particles, and transmits the data to the control module. The test personnel view and export the final data through the host control module.

2. The method for weighing filter paper for sampling particulate matter in automobile emission test according to claim 1, characterized in that: The interactive module is used to input the required number of filter paper sheets and query filter paper data according to time and vessel number.

3. The method for weighing filter paper for sampling particulate matter in automobile emission test according to claim 1, characterized in that: The environmental monitoring module is used to automatically record the temperature, humidity, dew point and pressure data in the weighing environment at a certain frequency. When the monitored data exceeds the preset range, the environmental control module is started.

4. The method for weighing filter paper for sampling particulate matter in automobile emission test according to claim 1, characterized in that: The environmental control module is used to control the temperature and humidity in the weighing environment to maintain a constant and stable state, and to detect whether the weighing environment meets the preset environmental conditions. When the preset environmental conditions are met, a paper output instruction is issued to the filter paper weighing module.

5. The method for weighing filter paper for sampling particulate matter in automobile emission test according to claim 1, characterized in that: The tray control module is used to control the filter paper weighing module to place the clean filter paper in an empty vessel box with a cover in the storage area of ​​the vessel transport module.

6. The method for weighing filter paper for sampling particulate matter in automobile emission test according to claim 1, characterized in that: The vessel transport control module is used to open or close the covered vessel box in the vessel transport module, and to control the vessel transport module to transport the covered vessel box before the test to the storage area and the waiting area in sequence, and to transport the covered vessel box after the test to the static area and the weighing area in sequence, and to recycle the filter paper after the test weighing.

7. The method for weighing filter paper for sampling particulate matter in automobile emission test according to claim 1, characterized in that: The conveying device assembly includes a first conveying device, a second conveying device and a transition transmission device; the first conveying device and the second conveying device are connected through the transition transmission device; the storage area and the waiting area are arranged on the first conveying device, and the static area and the waiting area are arranged on the second conveying device.

8. The method for weighing filter paper for sampling particulate matter in automobile emission tests according to claim 7, characterized in that: The transition transmission device is used to transport the empty covered container boxes after weighing in the waiting area of ​​the second conveying device to the storage area of ​​the first conveying device, and the empty covered container boxes in the storage area are used to place clean filter paper; the first conveying device is used to transport the covered container boxes containing clean filter paper to the waiting area, and the covered container boxes in the waiting area are used for testing; the second conveying device is used to transport the covered container boxes containing filter paper after the test to the static area, and then transport them to the waiting area after static placement.

9. The method for weighing filter paper for sampling particulate matter in automobile emission tests according to claim 7, characterized in that: The weighing environment is provided with a first window and a second window, and the first window and the second window are respectively arranged in a waiting area of ​​the first conveying device and a static area of ​​the second conveying device.

10. The method for weighing filter paper for sampling particulate matter in automobile emission tests according to claim 1, characterized in that: There are a plurality of container boxes with covers, and each container box with covers is numbered; the top of the microgram balance is provided with a plurality of feelers for placing a lifting tray, and the bottom is provided with a rubber gasket.

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