Suction resistance test system

Abstract

The utility model relates to the technical field of tobacco detection equipment, and provides a draw resistance test system, which comprises a measuring mechanism, a first air flow port and a second air flow port, the measuring mechanism is internally provided with a slot, a suction cavity, a first air flow port and a second air flow port, the first air flow port and the second air flow port are respectively communicated with the suction cavity, and the suction cavity is communicated with the slot; the positive pressure end of the pressure sensor and the first end of the built-in standard rod are communicated with the atmosphere; the suction port of the system, the second end of the built-in standard rod, the negative pressure end of the pressure sensor, the first airflow port and the second airflow port are connected through a switching valve group, the system forms an airflow loop for calibration when the switching valve group is in a first working state, and the system forms an airflow loop for suction resistance test when the switching valve group is in a second working state. A standard rod does not need to be placed in the measuring mechanism, manual calibration personnel and workload are reduced, the situation that the state of the standard rod is changed due to non-standard manual calibration can be avoided, and the testing accuracy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of tobacco detection equipment, in particular to a draw resistance testing system. Background Art

[0002] In the tobacco manufacturing industry, whether it is the production of filter rod materials or the production of finished cigarettes, multiple physical indicators of the products must be tested and monitored, and draw resistance is a very important physical indicator. Before conducting the draw resistance test, the pressure sensor in the test equipment needs to be calibrated and verified.

[0003] At present, manual calibration is widely used, that is, the standard rod needs to be manually placed into the sample absorption resistance test device. After completing the calibration and verification of the pressure sensor, the standard rod needs to be manually taken out, and then subsequent sample testing is carried out. In actual use, the pressure sensor is usually calibrated and verified every day. When there are many devices that need to be tested, it is a huge workload to perform a round of calibration and verification on all the devices, which increases the workload of the operator. In addition, non-standard manual calibration and verification will cause changes in the state of the standard rod, such as temperature increase, resulting in changes in the resistance value of the standard rod, increasing the measurement deviation, and thus affecting the quality judgment of the sample. Utility Model Content

[0004] The utility model provides a suction resistance testing system, which is used to solve the problems in the prior art of manually calibrating a pressure sensor in a suction resistance testing device, resulting in heavy workload and increased suction resistance measurement deviation.

[0005] The utility model provides a suction resistance testing system, comprising: a measuring mechanism, wherein a slot, a suction cavity, and a first air flow port and a second air flow port respectively connected to the suction cavity are provided in the measuring mechanism, and the suction cavity is connected to the slot; a pressure sensor and a built-in standard rod, wherein the pressure sensor is provided with a positive pressure end and a negative pressure end, and the positive pressure end and the first end of the built-in standard rod are connected to the atmosphere; a switching valve group and a suction port, wherein in a first working state, the switching valve group enables the suction port to be connected to the second end of the built-in standard rod and blocked from the first air flow port, and enables the negative pressure end to be connected to the second end and blocked from the second air flow port; in a second working state, the switching valve group enables the suction port to be connected to the first air flow port and blocked from the second end, and enables the negative pressure end to be connected to the second air flow port and blocked from the second end.

[0006] According to a suction resistance testing system provided by the utility model, the switching valve group includes a first switching valve; the first switching valve is provided with a first air inlet, a second air inlet and a first air outlet, the first air inlet is connected to the first air flow outlet, the second air inlet is connected to the second end, and the first air outlet is connected to the suction port; the first switching valve can switch the first air inlet and the second air inlet to be connected to the first air outlet.

[0007] According to a suction resistance testing system provided by the utility model, the switching valve group includes a second switching valve; the second switching valve is provided with a third air inlet, a second air outlet and a third air outlet, the third air inlet is connected to the negative pressure end, the second air outlet is connected to the second end, and the third air outlet is connected to the second air flow outlet; the second switching valve can switch the second air outlet and the third air outlet to be connected to the third air inlet.

[0008] According to a suction resistance testing system provided by the utility model, the second switching valve is a two-position three-way valve.

[0009] According to a suction resistance testing system provided by the utility model, it also includes: a timer and a controller, the timer, the switching valve group and the pressure sensor are respectively connected to the controller for communication, and the controller is used to calibrate the pressure sensor.

[0010] According to a suction resistance testing system provided by the utility model, it also includes: a temperature sensor and a controller, the temperature sensor, the switching valve group and the pressure sensor are respectively connected to the controller for communication, and the controller is used to calibrate the pressure sensor.

[0011] According to the utility model, a suction resistance testing system is provided, which also includes: a first filter, and the first end and the positive pressure end are connected to the atmosphere through the first filter.

[0012] According to a suction resistance testing system provided by the utility model, it also includes: a constant current component, the air outlet of the constant current component is connected to the suction port, and the air inlet of the constant current component is connected to the second end and the first air flow outlet through the switching valve group.

[0013] According to a suction resistance testing system provided by the utility model, it also includes: a second filter, and the air inlet of the constant current component is connected to the switching valve group through the second filter.

[0014] According to a suction resistance testing system provided by the utility model, it also includes: a vacuum air source, and the vacuum air source is connected to the suction port.

[0015] The suction resistance test system provided by the utility model realizes the switching of two airflow circuits by setting a built-in standard rod and a switching valve group, and using the switching valve group to switch the connection relationship between the measuring mechanism, the built-in standard rod, the pressure sensor and the suction port. When the switching valve group is in the first working state, the system forms an airflow circuit for calibrating the pressure sensor, and when the switching valve group is in the second working state, the system forms an airflow circuit for testing the suction resistance of the sample to be tested. In this embodiment, there is no need to put a standard rod in the measuring mechanism, and the calibration and verification of the pressure sensor is completed directly using the built-in standard rod, which realizes automatic calibration, improves the automation level of the test system, reduces the personnel and workload of manual calibration, can avoid changes in the state of the standard rod caused by non-standard manual calibration, and improves the accuracy of the test. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0017] Figure 1 It is a structural schematic diagram of the absorption resistance testing system provided by the utility model.

[0018] Reference numerals:

[0019] 1. Measuring mechanism; 11. Slot; 12. Suction cavity; 13. First air outlet; 14. Second air outlet; 2. Pressure sensor; 21. Positive pressure end; 22. Negative pressure end; 3. Built-in standard rod; 31. First end; 32. Second end; 4. Switching valve group; 41. First switching valve; 411. First air inlet; 412. Second air inlet; 413. First air outlet; 42. Second switching valve; 421. Third air inlet; 422. Second air outlet; 423. Third air outlet; 5. Suction port; 6. Vacuum air source; 7. Sample to be tested; 8. Constant current component; 91. First filter; 92. Second filter. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "first", "second" and "third" are numbered for the purpose of clearly explaining the product components and do not represent any substantial difference. The directions of "upper" and "lower" shall be based on the directions shown in the accompanying drawings. The terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to the specific circumstances.

[0022] Combine the following Figure 1 The utility model is described in detail.

[0023] like Figure 1 As shown, the suction resistance test system provided by the embodiment of the utility model includes a measuring mechanism 1, a pressure sensor 2, a built-in standard rod 3, a switching valve group 4 and a suction port 5. The measuring mechanism 1 is provided with a slot 11, a suction cavity 12, and a first air flow port 13 and a second air flow port 14 respectively connected to the suction cavity 12, and the suction cavity 12 is connected to the slot 11. The pressure sensor 2 is provided with a positive pressure end 21 and a negative pressure end 22, and the positive pressure end 21 and the first end 31 of the built-in standard rod 3 are connected to the atmosphere.

[0024] In the first working state, the switching valve group 4 connects the suction port 5 with the second end 32 and blocks the first air flow port 13, and connects the negative pressure end 22 with the second end 32 and blocks the second air flow port 14. In the second working state, the switching valve group 4 connects the suction port 5 with the first air flow port 13 and blocks the second end 32, and connects the negative pressure end 22 with the second air flow port 14 and blocks the second end 32.

[0025] The slot 11 is used to insert the sample 7 to be tested. Figure 1 As shown, the upper end of the sample 7 to be tested is connected to the atmosphere, and the lower end is connected to the suction chamber 12. The built-in standard rod 3 is a standard rod built into the suction resistance test system and is independent of the measuring mechanism 1. It is a standard device of the same type as the sample 7 to be tested. The suction port 5 is used to connect to a suction mechanism, such as a vacuum air source, and to generate negative pressure by suction to make the atmosphere flow to the suction port 5 through the built-in standard rod 3 or the measuring mechanism 1.

[0026] The pressure sensor 2 is a differential pressure sensor, whose positive pressure end 21 and the first end 31 of the built-in standard rod 3 are connected to the atmosphere, and the negative pressure end 22 is connected to the second end 32 of the built-in standard rod 3 and the second air flow port 14 through the switching valve group 4. The pressure sensor 2 can be used to detect the pressure difference at both ends of the built-in standard rod 3 or the pressure difference at both ends of the sample to be tested 7 in the measuring mechanism 1. The system can calibrate the pressure sensor 2 according to the measured pressure difference at both ends of the built-in standard rod 3, and obtain the suction resistance of the sample to be tested 7 according to the measured pressure difference at both ends of the sample to be tested 7.

[0027] Before the suction resistance test is performed on the sample 7 to be tested, the pressure sensor 2 needs to be calibrated and verified. The specific steps are to switch the switching valve group 4 to the first working state, so that the suction port 5 is connected to the second end 32 and blocked from the first air flow port 13, and the negative pressure end 22 is connected to the second end 32 and blocked from the second air flow port 14. At this time, suction is performed from the suction port 5, and the atmosphere will enter the built-in standard rod 3 from the first end 31 of the built-in standard rod 3, and then flow from the second end 32 of the built-in standard rod 3 to the suction port 5 without passing through the measuring mechanism 1. The pressure sensor 2 detects the pressure difference between the two ends of the built-in standard rod 3, and the pressure sensor 2 can be calibrated and verified based on the pressure difference and the metering parameters of the built-in standard rod 3.

[0028] After completing the calibration and verification of the pressure sensor 2, the sample to be tested 7 is inserted into the slot 11 of the measuring mechanism 1, and the suction resistance test of the sample to be tested 7 is started. The specific steps are: switch the switching valve group 4 to the second working state, so that the suction port 5 is connected to the first air flow port 13 and blocked with the second end 32, and the negative pressure end 22 is connected to the second air flow port 14 and blocked with the second end 32. At this time, the atmosphere enters the suction cavity 12 from the sample to be tested 7, and then flows to the suction port 5 through the first air flow port 13 without passing through the built-in standard rod 3. At this time, the pressure sensor 2 detects the pressure difference at both ends of the sample to be tested 7, and obtains the suction resistance of the sample to be tested 7 based on the measured pressure.

[0029] It should be noted that the suction resistance test system provided by the utility model can also be used for manual calibration, that is, insert a standard rod into the slot 11 of the measuring mechanism 1, switch the switching valve group 4 to the second working state, so that the suction port 5 is connected to the first air flow port 13 and blocked with the second end 32, and the negative pressure end 22 is connected to the second air flow port 14 and blocked with the second end 32. At this time, the atmosphere enters the suction cavity 12 from the standard rod, and then flows to the suction port 5 through the first air flow port 13 without passing through the built-in standard rod 3. At this time, the pressure sensor 2 collects the pressure at the air flow outlet end of the standard rod, and the pressure sensor 2 is calibrated and verified based on the measured pressure. After the calibration is completed, the current connection mode is maintained to test the sample.

[0030] The draw resistance test system provided by the embodiment of the utility model realizes the switching of two air flow circuits by setting the built-in standard rod 3 and the switching valve group 4, and using the switching valve group 4 to switch the connection relationship between the measuring mechanism 1, the built-in standard rod 3, the pressure sensor 2 and the suction port 5. When the switching valve group 4 is in the first working state, the system forms an air flow circuit for calibrating the pressure sensor 2, and when the switching valve group 4 is in the second working state, the system forms an air flow circuit for the draw resistance test of the sample 7 to be tested.

[0031] Compared with the traditional manual calibration method, that is, manually placing the standard rod into the measuring mechanism 1, manually taking out the standard rod after completing the calibration verification, and then placing the sample for formal testing, this embodiment can realize automatic calibration, that is, there is no need to place the standard rod in the measuring mechanism 1, and directly use the built-in standard rod 3 to complete the calibration verification of the pressure sensor 2, thereby improving the automation level of the test system, reducing the number of personnel and workload for manual calibration, and avoiding changes in the state of the standard rod caused by non-standard manual calibration, thereby improving the accuracy of the test. The absorption resistance test system provided in this embodiment is compatible with automatic calibration and manual calibration functions, and can realize the switching between automatic calibration and manual calibration.

[0032] The suction resistance testing system provided by the embodiment of the utility model also includes a vacuum air source 6, which is connected to the suction port 5, and uses the negative pressure generated by the vacuum air source 6 to suck the sample to be tested 7 or the built-in standard rod 3, wherein the atmosphere is switched to enter from the measuring mechanism 1 or from the built-in standard rod 3 by switching the valve group 4.

[0033] In the embodiment of the utility model, the switching valve group 4 includes a first switching valve 41. The first switching valve 41 is provided with a first air inlet 411, a second air inlet 412 and a first air outlet 413. The first air inlet 411 is connected to the first air flow port 13, the second air inlet 412 is connected to the second end 32, and the first air outlet 413 is connected to the suction port 5. The first switching valve 41 can switch the first air inlet 411 and the second air inlet 412 to be connected to the first air outlet 413.

[0034] Optionally, the first switching valve 41 is a two-position three-way valve. The first switching valve 41 has a first working position and a second working position. When the first switching valve 41 is in the first working position, the first air outlet 413 is blocked from the first air inlet 411 and is connected to the second air inlet 412. When the first switching valve 41 is in the second working position, the first air outlet 413 is connected to the first air inlet 411 and is blocked from the second air inlet 412.

[0035] In the embodiment of the utility model, the switching valve group 4 includes a second switching valve 42, and the second switching valve 42 is provided with a third air inlet 421, a second air outlet 422 and a third air outlet 423. The third air inlet 421 is connected to the negative pressure end 22, the second air outlet 422 is connected to the second end 32, and the third air outlet 423 is connected to the second air flow outlet 14. The second switching valve 42 can switch the second air outlet 422 and the third air outlet 423 to be connected to the third air inlet 421.

[0036] Optionally, the second switching valve 42 is a two-position three-way valve. The second switching valve has a third working position and a fourth working position. When the second switching valve 42 is in the third working position, the third air inlet 421 is connected to the second air outlet 422 and is blocked from the third air outlet 423. When the second switching valve 42 is in the fourth working position, the third air inlet 421 is blocked from the second air outlet 422 and is connected to the third air outlet 423.

[0037] Further, the switching valve group 4 includes a first switching valve 41 and a second switching valve 42, and the second air inlet 412 of the first switching valve 41 and the second air outlet 422 of the second switching valve 42 are both connected to the second end 32 of the built-in standard rod 3. When the first switching valve 41 is located at the first working position, the second switching valve 42 is located at the third working position, and the automatic calibration can be started; when the first switching valve 41 is located at the second working position, the second switching valve 42 is located at the fourth working position, and the sample absorption resistance test can be started.

[0038] It should be noted that the composition structure of the switching valve group 4 is not limited to the first switching valve 41 and the second switching valve 42 described in this embodiment; the switching valve structure used to realize the connection between the suction port 5 and the second end 32 and the blockage between the first air flow port 13, and the connection between the negative pressure end 22 and the second end 32 and the blockage between the second air flow port 14 is not limited to the first switching valve 41 described in the above embodiment; the switching valve structure used to realize the connection between the suction port 5 and the first air flow port 13 and the blockage between the second end 32, and the connection between the negative pressure end 22 and the second air flow port 14 and the blockage between the second end 32 is not limited to the second switching valve 42 in the above embodiment; any valve group structure that can realize the above functions is acceptable.

[0039] The absorption resistance testing system provided by the embodiment of the utility model further includes a timer and a controller (not shown in the figure). The timer, the switching valve group 4 and the pressure sensor 2 are respectively connected to the controller for communication. The controller is used to calibrate the pressure sensor 2.

[0040] Specifically, the timer is used for timing, and the controller starts automatic calibration at a set time point, i.e., a certain moment or a set time interval, according to the time value output by the timer, thereby further improving the automation level of the test system.

[0041] When the time reaches the set time point or the set time interval, the controller controls the switching valve group 4 to switch to the first working state, and receives the pressure difference between the two ends of the built-in standard rod 3 detected by the pressure sensor 2, and then calibrates and verifies the pressure sensor 2 according to the measured pressure difference and the measurement parameters of the built-in standard rod 3. After the calibration is completed, the controller controls the switching valve group 4 to switch to the second working state and enter the sample testing stage.

[0042] The absorption resistance testing system provided by the embodiment of the utility model further includes a temperature sensor and a controller. The temperature sensor, the switching valve group 4 and the pressure sensor 2 are respectively connected to the controller for communication. The controller is used to calibrate the pressure sensor 2.

[0043] Specifically, the temperature sensor is used to detect the ambient temperature, and the controller starts automatic calibration at a set temperature according to the temperature value output by the temperature sensor, which further improves the automation level of the test system and the environmental adaptability of the system.

[0044] When the ambient temperature reaches the set temperature value, the controller controls the switching valve group 4 to switch to the first working state, and receives the pressure difference between the two ends of the built-in standard rod 3 detected by the pressure sensor 2, and then calibrates and verifies the pressure sensor 2 according to the measured pressure difference and the measurement parameters of the built-in standard rod 3. After the calibration is completed, the controller controls the switching valve group 4 to switch to the second working state and enter the sample testing stage.

[0045] The suction resistance test system provided by the embodiment of the utility model further includes a first filter 91, and the first end 31 of the built-in standard rod 3 and the positive pressure end 21 of the pressure sensor 2 are connected to the atmosphere through the first filter 91. The first filter 91 is used to filter the airflow to prevent dust from entering the built-in standard rod 3 and the pressure sensor 2.

[0046] The suction resistance test system provided by the embodiment of the utility model further includes a constant flow component 8, the air outlet of the constant flow component 8 is connected to the suction port 5, and the air inlet of the constant flow component 8 is connected to the second end 32 of the built-in standard rod 3 and the first air flow port 13 through the switching valve group 4. The vacuum air source 6 forms a constant flow of suction airflow through the constant flow component 8.

[0047] Furthermore, the absorption resistance test system provided by the embodiment of the utility model further includes a second filter 92, and the air inlet of the constant current component 8 is connected to the switching valve group 4 through the second filter 92. The second filter 92 is used to filter the airflow to prevent dust from blocking the constant current component 8.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A suction resistance testing system, characterized in that: include: A measuring mechanism, wherein a slot, a suction cavity, and a first air flow opening and a second air flow opening respectively communicated with the suction cavity are provided in the measuring mechanism, and the suction cavity is communicated with the slot; A pressure sensor and a built-in standard rod, wherein the pressure sensor is provided with a positive pressure end and a negative pressure end, and the positive pressure end and a first end of the built-in standard rod are connected to the atmosphere; A switching valve group and a suction port, wherein the switching valve group, in a first working state, enables the suction port to be connected with the second end of the built-in standard rod and blocked with the first air flow port, and enables the negative pressure end to be connected with the second end and blocked with the second air flow port; and the switching valve group, in a second working state, enables the suction port to be connected with the first air flow port and blocked with the second end, and enables the negative pressure end to be connected with the second air flow port and blocked with the second end.

2. The absorption resistance testing system according to claim 1, characterized in that: The switching valve group includes a first switching valve; The first switching valve is provided with a first air inlet, a second air inlet and a first air outlet, the first air inlet is connected to the first air flow outlet, the second air inlet is connected to the second end, and the first air outlet is connected to the suction port; the first switching valve can switch the first air inlet and the second air inlet to be connected to the first air outlet.

3. The absorption resistance testing system according to claim 1 or 2, characterized in that: The switching valve group includes a second switching valve; The second switching valve is provided with a third air inlet, a second air outlet and a third air outlet, the third air inlet is connected to the negative pressure end, the second air outlet is connected to the second end, and the third air outlet is connected to the second air flow outlet; the second switching valve can switch the second air outlet and the third air outlet to be connected to the third air inlet.

4. The absorption resistance testing system according to claim 3, characterized in that: The second switching valve is a two-position three-way valve.

5. The absorption resistance testing system according to claim 1, characterized in that: Also includes: A timer and a controller, wherein the timer, the switching valve group and the pressure sensor are respectively connected to the controller for communication, and the controller is used to calibrate the pressure sensor.

6. The absorption resistance testing system according to claim 1, characterized in that: Also includes: A temperature sensor and a controller, wherein the temperature sensor, the switching valve group and the pressure sensor are respectively connected to the controller for communication, and the controller is used to calibrate the pressure sensor.

7. The absorption resistance testing system according to claim 1, characterized in that: Also includes: A first filter, wherein the first end and the positive pressure end are connected to the atmosphere through the first filter.

8. The absorption resistance testing system according to claim 1, characterized in that: Also includes: A constant flow component, wherein the air outlet of the constant flow component is connected to the suction port, and the air inlet of the constant flow component is connected to the second end and the first air flow outlet through the switching valve group.

9. The absorption resistance testing system according to claim 8, characterized in that: Also includes: A second filter, the air inlet of the constant flow component is connected to the switching valve group through the second filter.

10. The absorption resistance testing system according to claim 1, characterized in that: Also includes: A vacuum air source is connected to the suction port.

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