Automatic suction resistance calibration device for filter stick cigarette comprehensive test board

Abstract

The utility model relates to a suction resistance automatic calibration device for a filter stick cigarette comprehensive test board, which comprises a self-calibration mechanism, a measuring cylinder, a filtering device, a negative pressure generator, a precise differential pressure sensor and a measuring loop control system, the self-calibration mechanism is composed of a built-in calibration rod shell, a built-in pipe sleeve, an extension pipe, an O-shaped sealing ring, a balance pipeline, a negative pressure pipeline and a measurement pipeline, a standard rod can be placed in the built-in pipe sleeve, the initial position of the measurement cylinder is automatically calibrated through the self-calibration mechanism, timing automatic calibration under the non-stop condition is achieved, operation is easy and convenient, and the measurement precision is high. The detection precision effectiveness of the instrument draw resistance measurement module is ensured, the accuracy and the stability of online detection data of a product are further ensured, the influence of human factors on a measurement result is eliminated, and the measurement precision is improved.

Description

Technical Field

[0001] The utility model relates to the field of cigarette filter rod smoke draw resistance measurement, in particular to a filter rod cigarette comprehensive test bench draw resistance automatic calibration device. Background Art

[0002] In the tobacco industry, the physical properties of cigarettes and filter rods are important indicators that require inspection. They are important technical indicators for regulating cigarette production. Relevant technical indicators need to be strictly tested during the production process. The online comprehensive test bench used for testing needs to test cigarettes and filter rods one by one. Draw resistance is an important one among the important indicators. In order to ensure the continuity of the test and the accuracy of the test data, a device is needed to automatically calibrate the draw resistance.

[0003] The existing calibration method uses manual timed calibration, which requires stopping the machine for calibration and placing the standard rod into the measuring tube for measurement and calibration. Manual calibration has many uncontrollable factors. The storage environment temperature of the standard rod is inconsistent with the measuring unit, which can easily cause measurement and calibration errors.

[0004] An important indicator that affects the accuracy of the absorption resistance measurement data is the ambient gas temperature. If the ambient temperature rises by one degree, the absorption resistance data can increase by about 20pa. In order to ensure the accuracy of automatic calibration, it is necessary to design a device that can ensure that the internal and external ambient temperatures of the standard rod remain consistent. This device can ensure the accuracy of calibration and measurement by ensuring that the ambient air circulation temperature of the standard rod is consistent with the measurement ambient temperature.

[0005] CN200710157563.1 and CN200720015396.2 both disclose an automatic calibration system for an absorption resistance meter, and both involve "an automatic calibration system for an absorption resistance meter, having an air circuit device and an electronic control device, wherein the air circuit device includes a calibration air circuit and a measuring air circuit, which are connected in parallel to the same air source, wherein the calibration air circuit has two absorption resistance standard rod measuring heads, and the measuring air circuit has a sample measuring head, and each measuring head is connected to a negative pressure vacuum pump through an electric valve and a manual valve in its own air circuit through the same flow constant element and a buffer chamber, and a gas pressure difference sensor is provided in the flow constant element and the buffer chamber"; although the automatic calibration of the standard rod is disclosed, the problem of airflow balance of the standard rod is not considered. Since temperature has a great influence on the absorption resistance, if the ambient temperature of the standard rod is inconsistent with the ambient temperature of the measuring tube, a large measurement error will occur. Utility Model Content

[0006] The utility model aims to provide an automatic resistance-drawing calibration device for a filter rod cigarette comprehensive test bench that can replace manual resistance-drawing self-calibration function, and can perform calibration without stopping the machine according to the set time. Moreover, the ambient temperature of the standard rod is consistent with the measurement environment, thereby improving the measurement accuracy, reducing the operation complexity, and ensuring the accuracy and stability of the data.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] The invention discloses an automatic calibration device for the draw resistance of a filter rod and cigarette comprehensive test bench, comprising a self-calibration mechanism, a measuring cylinder, a filtering device, a negative pressure generator, a precision differential pressure sensor and a measurement loop control system, wherein the self-calibration mechanism is used for automatically calibrating the initial position of the measuring cylinder, the measuring cylinder is used for measuring cigarettes or filter rods, or calibrating the draw resistance when manual calibration is required, the filtering device is located at the entrance of the measuring cylinder, and is used for filtering out impurities in the fluid or gas to be measured, the negative pressure generator is located at the front of the entire device, and is used for providing the negative pressure required by the device during testing, thereby ensuring that a stable gas source of the measurement system enters the measuring cylinder or the self-calibration mechanism to work, and is used for detecting the pressure difference in the measuring cylinder or the pressure difference of a standard rod in the self-calibration mechanism, and the measurement loop control system is used for controlling the gas path switching of the entire measurement system and controlling the operation of the negative pressure generator to achieve self-calibration and precise measurement.

[0009] Preferably, the self-calibration mechanism is composed of a built-in calibration rod housing, a built-in pipe sleeve, an extension tube, an O-ring, a balance pipeline, a negative pressure pipeline and a measurement pipeline, and the standard rod can be placed in the built-in pipe sleeve.

[0010] Preferably, the tube sleeve and the balance pipeline in which the standard rod is placed are connected to the atmosphere, so as to balance the temperature difference between the inside and outside of the built-in tube sleeve, ensure that the temperature of the standard rod is consistent with the external environment temperature, and eliminate calibration errors.

[0011] Preferably, the self-calibration mechanism and the measuring cylinder are arranged in parallel, and the self-calibration mechanism and the measuring cylinder are connected in parallel at the measuring loop control system through an air pipeline, and the measuring system pipeline is switched by the measuring loop control system to control the separate measurements of the self-calibration mechanism and the measuring cylinder.

[0012] Preferably, the precision differential pressure sensor is located in parallel with the measuring cylinder and the self-calibration mechanism.

[0013] Beneficial effects of the utility model:

[0014] 1) The utility model automatically calibrates the initial position of the measuring tube through the self-calibration mechanism, realizes the timed automatic calibration without stopping the machine, is simple and convenient to operate, ensures the detection accuracy and effectiveness of the instrument's absorption resistance measurement module, and thus ensures the accuracy and stability of the product's online detection data, eliminates the influence of human factors on the measurement results, and improves the measurement accuracy;

[0015] 2) The utility model keeps the ambient temperature of the standard rod consistent with the ambient temperature of the measuring tube, thus avoiding calibration errors caused by temperature differences and ensuring the stability and accuracy of the measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is a structural schematic diagram of an automatic draw resistance calibration device of a filter rod cigarette comprehensive test bench.

[0017] Figure 2 It is a structural schematic diagram of the self-calibration mechanism of the utility model.

[0018] Figure 3 The utility model discloses a system principle diagram of an automatic draw resistance calibration device of a filter rod cigarette comprehensive test bench.

[0019] In the figure: 1. self-calibration mechanism, 101. negative pressure pipeline, 102. O-ring, 103. measuring pipeline, 104. balancing pipeline, 105. extension tube, 106. standard rod, 107. built-in calibration rod housing, 108. built-in pipe sleeve; 2. measuring cylinder; 3. filtering device; 4. negative pressure generator; 5. precision differential pressure sensor; 6. measuring loop control system. DETAILED DESCRIPTION

[0020] The following are specific embodiments of the present invention, and the technical solution of the present invention is further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments.

[0021] like Figure 1 As shown, an automatic calibration device for the draw resistance of a filter rod and cigarette comprehensive test bench comprises a self-calibration mechanism 1, a measuring cylinder 2, a filtering device 3, a negative pressure generator 4, a precision differential pressure sensor 5 and a measurement loop control system 6, wherein the self-calibration mechanism 1 is used to automatically calibrate the initial position of the measuring cylinder 2, the measuring cylinder 2 is used to measure cigarettes or filter rods, or to calibrate the draw resistance when manual calibration is required, the filtering device 3 is located at the entrance of the measuring cylinder 2, and is used to filter out impurities in the fluid or gas to be measured, the negative pressure generator 4 is located at the front of the entire device, and the negative pressure generator 4 is used to provide the negative pressure required by the device during testing, thereby ensuring that a stable gas source of the measurement system enters the measuring cylinder 2 or the self-calibration mechanism 1 to work, and is used to detect the pressure difference in the measuring cylinder 2 or the pressure difference of the standard rod 106 in the self-calibration mechanism 1, and the measurement loop control system 6 is used to control the gas path switching of the entire measurement system and control the operation of the negative pressure generator 4 to achieve self-calibration and precise measurement.

[0022] The self-calibration mechanism 1 is composed of a built-in calibration rod housing 107 , a built-in pipe sleeve 108 , an extension tube 105 , an O-ring 102 , a balance pipeline 104 , a negative pressure pipeline 101 and a measuring pipeline 103 . A standard rod 106 can be placed in the built-in pipe sleeve 108 .

[0023] The tube sleeve in which the standard rod 106 is placed is connected to the balance pipeline 104 and the atmosphere, so as to balance the temperature difference between the inside and outside of the built-in tube sleeve 108, ensure that the temperature of the standard rod 106 is consistent with the external environment temperature, and eliminate calibration errors.

[0024] Indoor air enters the outside of the built-in standard rod 106 through the side hole of the built-in calibration rod shell 107 through negative pressure, and then flows out through the outer wall of the extension tube 105 and the balance pipeline 104, thereby achieving a balanced effect between the built-in standard rod and the indoor atmospheric temperature.

[0025] The self-calibration mechanism 1 and the measuring cylinder 2 are parallel devices.

[0026] The precision differential pressure sensor 5 is located at the parallel connection between the measuring cylinder 2 and the self-calibration mechanism 1 .

[0027] Working principle of this utility model:

[0028] According to the process requirements, the measuring circuit 103 and the calibration circuit can be switched regularly through the measuring loop control system 6. When the integrated test bench is working normally, the measuring loop control system 6 is started to switch the working position of the negative pressure generator 4 to the self-calibration mechanism 1. The measuring loop control system 6 opens the measuring circuit 103. At this time, the calibration circuit is in a closed state. The cigarette / filter rod placed in the measuring tube 2 is measured, and the suction resistance data is obtained by measuring the pressure difference at both ends of the cigarette or filter rod. The precision pressure difference sensor 5 reads the pressure difference at both ends of the measuring tube 2 or the automatic calibration device, and the measuring loop control system 6 processes the data. When calibration is required, the measuring loop control system 6 automatically switches to open the calibration circuit to measure the built-in standard rod 106. At this time, the measuring circuit 103 is In the closed state, the negative pressure generator 4 is started, and the negative pressure gas enters the self-calibration mechanism 1, and the standard rod 106 is placed inside the self-calibration mechanism 1. The pressure difference of the standard rod 106 in the self-calibration mechanism 1 is measured by the precision differential pressure sensor 5. The tube sleeve in which the standard rod 106 is placed, the balance pipeline 104 and the atmosphere are connected, which can balance the temperature difference inside and outside the tube sleeve, ensure that the temperature of the standard rod 106 is consistent with the external environment temperature, eliminate calibration errors, and achieve accurate measurement; at the same time, under the control of the program, during normal measurement, the gas circuit is connected to the measuring tube 2 to measure the cigarette or filter rod, and the draw resistance is calibrated by timing. At this time, the gas circuit is switched to the self-calibration mechanism 1, and the precision differential pressure sensor 5 reads the pressure difference data of the standard rod 106. After the data is processed, the draw resistance data is calibrated.

[0029] The utility model adopts gas circuit switching to ensure the two states of measurement and calibration. The pressure difference at both ends of the measuring tube 2 or the self-calibration mechanism 1 is read out through the precision pressure difference sensor 5. The pressure difference is also the suction resistance data. The measurement circuit control system 6 processes the data. In the space where the standard rod 106 is placed as shown in the figure, the negative pressure circuit is connected to the precision pressure difference sensor 5 for data reading, and the balance line 104 is connected to the positive pressure of the atmosphere, which is consistent with the environment of the measuring tube 2. The standard rod 106 in the self-calibration mechanism 1 is in a balanced environment, which can separate the negative pressure during measurement from the positive pressure environment of the standard rod 106, eliminates the calibration error caused by temperature difference, and ensures the consistency of data.

[0030] At the same time, the utility model automatically calibrates the initial position of the measuring tube 2 through the self-calibration mechanism 1, realizes timed automatic calibration without stopping the machine, and is simple and convenient to operate, thereby ensuring the effectiveness of the detection accuracy of the instrument's absorption resistance measurement module, thereby ensuring the accuracy and stability of the product's online detection data, eliminating the influence of human factors on the measurement results, improving the measurement accuracy, and ensuring the stability and accuracy of the measurement.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An automatic calibration device for the draw resistance of a filter rod cigarette comprehensive test bench, characterized in that: It comprises a self-calibration mechanism (1), a measuring cylinder (2), a filtering device (3), a negative pressure generator (4), a precision differential pressure sensor (5) and a measuring loop control system (6); wherein: The self-calibration mechanism (1) is used to automatically calibrate the initial position of the measuring cylinder (2), and the measuring cylinder (2) is used to measure cigarettes or filter rods, or to calibrate the draw resistance when manual calibration is required; The filter device (3) is located at the inlet of the measuring cylinder (2) and is used to filter out impurities in the fluid or gas to be measured; The negative pressure generator (4) is located at the front of the entire device and is used to provide the negative pressure required by the device during testing, thereby ensuring that a stable gas source of the measuring system enters the measuring cylinder (2) or the self-calibration mechanism (1) to work, forming a pressure difference in the measuring cylinder (2) or a pressure difference of the standard rod (106) in the self-calibration mechanism (1); The measurement loop control system (6) is used to control the gas path switching of the entire measurement system and control the operation of the negative pressure generator (4) to achieve self-calibration and accurate measurement; The self-calibration mechanism (1) and the measuring cylinder (2) are arranged in parallel; the self-calibration mechanism (1) and the measuring cylinder (2) are connected in parallel at a measuring loop control system (6) through an air pipeline, and the measuring loop control system (6) switches the measuring system pipeline to control the self-calibration mechanism (1) and the measuring cylinder (2) to measure separately.

2. The automatic calibration device for the draw resistance of the filter rod cigarette comprehensive test bench according to claim 1, characterized in that: The self-calibration mechanism (1) is composed of a built-in calibration rod housing (107), a built-in pipe sleeve (108), a built-in standard rod (106), an extension tube (105), an O-ring (102), a balance pipeline (104), a negative pressure pipeline (101) and a measuring pipeline (103); the built-in standard rod (106) is placed inside the built-in calibration rod housing (107) through the built-in pipe sleeve (108); the extension tube (105) is connected to the built-in calibration rod housing (107) to form a built-in standard rod. The extended measuring pipeline of the calibration rod (106) and the balancing pipeline (104) are connected to a negative pressure air source; the indoor air enters the outside of the built-in calibration rod (106) through the side hole of the built-in calibration rod housing (107) through the negative pressure and then flows out through the outer wall of the extension pipe (105) and the balancing pipeline (104) to achieve the effect of balancing the built-in calibration rod and the indoor atmospheric temperature; the negative pressure pipeline (101) is connected to the measuring loop control system (6), and the measuring pipeline (103) is connected to the precision differential pressure sensor (5).

3. The automatic calibration device for the draw resistance of the filter rod cigarette comprehensive test bench according to claim 2, characterized in that: The pipe sleeve and the balance pipe (104) in which the standard rod (106) is placed are connected to the atmosphere and are used to balance the temperature difference between the inside and outside of the built-in pipe sleeve (108) and ensure that the temperature of the standard rod (106) is consistent with the external environment temperature.

4. The automatic calibration device for draw resistance of filter rod cigarette comprehensive test bench according to claim 1, characterized in that: The precise differential pressure sensor (5) is located at the parallel connection between the measuring cylinder (2) and the self-calibration mechanism (1).

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