A weight loss test device for combustion type smoke generating element

Abstract

The present invention provides a weight loss test device for a combustion type smoke element, which belongs to the technical field of performance testing of pyrotechnic products; the present invention adopts an electronic weighing scale with a serial data communication function to monitor the real-time weight of the test product, and the real-time weight data of the test product is transmitted from a wireless transmission module to a wireless receiving module, and collected by a special test software installed in a laptop computer. After the test is completed, data can be stored and analyzed, and a test report can be generated. Compared with the prior art, the site layout of the present invention is simple, the test accuracy is guaranteed by the test accuracy of the electronic weighing scale, human interference factors are eliminated, the sampling frequency is 10Hz, and data reading is not interfered by smoke, eliminating safety hazards.

Description

Technical Field

[0001] The invention belongs to the field of performance testing of pyrotechnic products, and specifically relates to a weight loss testing device for a combustion type smoke generating element. Background Art

[0002] The weight loss of the smoke-generating component is the difference between the initial weight of the test sample and the weight at a specific moment after the test sample starts to smoke. In the development and production process of combustion-type smoke-generating components, in order to verify whether the control of the mixing and pressing of the agent meets the requirements, it is usually necessary to test its weight loss.

[0003] At present, the industry uses the direct reading method of the scale for the weight loss test of the combustion type smoke element. That is, a layer of heat insulation material is placed on the load-bearing surface of the scale, and the test sample is placed on the heat insulation material. The tester records the initial weight of the test sample and then ignites the test sample. When the time reaches the specified time during the smoke process of the test sample, the scale indication is recorded to calculate the weight loss.

[0004] Due to the reasons such as the large error when the test personnel read the data during the dynamic test and the delay of the digital display time of the scale, the test data accuracy is low and the error can reach 5-10g. Affected by factors such as the reaction time of the test personnel, the data sampling frequency is lower than 0.2Hz. When the weather conditions are not good, the scale indication is easily interfered or even obscured by the smoke screen of the test product. In order to read the data, the operator needs to get close to the test product, which poses a safety hazard. Summary of the invention

[0005] The purpose of the present invention is to provide a weight loss test device for a combustion type smoke element, so as to realize real-time weight loss test, data storage and analysis of the combustion type smoke element, thereby solving the technical problems of low accuracy of weight loss test data in direct reading of a weighing instrument, low sampling frequency, easy interference of the weighing instrument indication reading with smoke screen of the test product, and potential safety hazards.

[0006] In order to achieve the above purpose and solve the above technical problems, the technical solution provided by the present invention is as follows:

[0007] A combustion type smoke element weight loss test device, comprising a hardware part and a software part;

[0008] The hardware part is composed of a laptop computer 1, a wireless receiving module 2, a wireless transmitting module 3, an electronic weighing scale 4, and a heat-insulating bracket 5; the heat-insulating bracket 5 is composed of a load-bearing layer 7, a heat-insulating layer 8, a mounting layer 9, a locking bolt 10, a limit groove 11, and a limit support leg 12; the load-bearing layer 7 is a thick steel plate, and a limit groove 11 for placing the test sample is installed on its upper surface; the heat-insulating layer 8 is a thick aluminum silicate fiberboard, and the mounting layer 9 is a thick steel plate, and four limit support legs 12 are installed on the lower surface of the mounting layer 9; the locking bolt 10 is used to fix the limit groove 11, and each structural layer is fixed as a whole by connecting bolts;

[0009] The laptop computer 1 is connected to the wireless receiving module 2 via a USB interface; the limiting leg 12 of the heat-insulating bracket 5 is inserted into the limiting hole of the electronic weighing scale 4; the wireless transmitting module 3 is connected to the RS232 data interface of the electronic weighing scale 4;

[0010] The software part is a special test software; the special test software is installed in the laptop 1; the special test software includes four functional modules: parameter setting, weight loss test, data processing, and usage help;

[0011] The parameter setting module implements serial communication settings, test product information settings, test mode settings, acquisition display mode settings, and test report settings; the serial communication function is used to detect the available serial ports of the laptop computer and set parameters such as the baud rate; the test product information setting function is used to input the test product name and text information of the test conditions, and save them in the same file with the test data; the test mode setting function is used to set the test mode, including two modes: weight-loss-time characteristics and weight-time characteristics; the acquisition display mode setting is used to set the mode of real-time display of data during data acquisition, including digital mode and curve mode; the test report setting is used to set the data display content when generating the test report, and realize equal interval output and data output at specified time points;

[0012] The weight test module realizes the functions of collecting the initial weight of the test product, collecting the weight loss data, displaying the weight loss data in real time, and saving data; collecting the initial weight of the test product before igniting the test product, and this data is the arithmetic average of the data sampled for 3 seconds in a row; collecting the weight loss data after igniting the test product, and when it is the weight loss-time characteristic mode, the real-time weight loss of the test product is calculated based on the difference between the initial weight of the test product and the weight data collected by the computer in real time; the real-time display function of weight loss data is used to display real-time data in the form of numbers or curves during the test process; the data saving function is used to store the test product information and the collected data in a data file in the txt document format;

[0013] The data processing module realizes the retrieval of test data, the drawing of weight loss-time curve, curve interception, characteristic data calculation, and report generation; the test data retrieval function can import the test data in text form into the memory of the laptop computer 1, and display the test product information and data curve in the software interface; the weight loss-time curve drawing function realizes the drawing of weight loss-time curve, the display of the current mouse position data, and the initialization of the curve operation function; the curve interception function is used to remove redundant data and redraw the curve; the characteristic data calculation function is used to calculate the weight loss data at the corresponding time point according to the parameters in the test report setting item in the parameter setting module; the report generation function is used to save the test product information, weight loss-time curve, characteristic data and other information in the word document format as a test report;

[0014] The help module is used to open the help document to assist testers in completing the test.

[0015] The effective benefits of the present invention are as follows:

[0016] The present invention provides a combustion type smoke element weight loss test device that uses an electronic weighing scale with serial data communication function to monitor the real-time weight of the test sample. The real-time weight data of the test sample is transmitted from the wireless transmission module to the wireless receiving module and collected by the special test software installed in the laptop computer. After the test is completed, data can be stored and analyzed, and a test report can be generated. Compared with the prior art, the present invention has a simple site layout, and the test accuracy is guaranteed by the test accuracy of the electronic weighing scale, eliminating human interference factors, and the sampling frequency is 10Hz. Data reading is not interfered by smoke, eliminating safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the assembly of the present invention;

[0018] Figure 2 It is a structural schematic diagram of the heat insulation bracket of the present invention;

[0019] Figure 3 It is a test flow chart of the present invention;

[0020] Figure 4 This is an example of the weight loss-time characteristic curve of the test data of the present invention.

[0021] Among them: 1-laptop computer, 2-wireless receiving module, 3-wireless transmitting module, 4-electronic weighing scale, 5-insulation bracket, 6-connecting bolt, 7-load-bearing layer, 8-insulation layer, 9-installation layer, 10-locking bolt, 11-limiting slot, 12-limiting support foot DETAILED DESCRIPTION

[0022] The present invention is further explained and illustrated below in conjunction with the accompanying drawings and specific embodiments.

[0023] The present invention uses an electronic weighing scale with a serial data communication function to monitor the real-time weight of the test sample. The measurement accuracy of the electronic weighing scale is 0.5g, and the data acquisition frequency is 30Hz. The data is sent through a wireless sending module, received by a wireless receiving module and transmitted to a laptop computer. VB6.0 is used to write special test software to realize functions such as data preservation, analysis, and report generation. In order to ensure the test accuracy, the special test software uses the arithmetic mean of every 3 collected data as 1 final valid data, so the actual acquisition frequency of the present invention is 10Hz. The thermal insulation bracket adopts a three-layer composite structure, which has the functions of heat insulation and fixing the test sample, and the spacing between the limit grooves is adjustable, so it is suitable for different test samples.

[0024] like Figure 1As shown, the hardware part of the present invention is composed of a laptop computer 1, a wireless receiving module 2, a wireless transmitting module 3, an electronic weighing scale 4, and a heat-insulating bracket 5. The structure of the heat-insulating bracket 5 is as shown in FIG. Figure 2 As shown, it is composed of connecting bolts 6, load-bearing layer 7, thermal insulation layer 8, mounting layer 9, locking bolts 10, limiting grooves 11, and limiting legs 12. The load-bearing layer 7 is a 1mm thick steel plate, and the limiting grooves 11 for placing the test sample are installed on its upper surface. The thermal insulation layer 8 is a 10mm thick aluminum silicate fiberboard. The mounting layer 9 is a 1mm thick steel plate, and 4 limiting legs 12 are installed on its lower surface. The locking bolts 10 are used to fix the limiting grooves 11, and each structural layer is fixed as a whole using 8 connecting bolts 6.

[0025] Assembly process: the laptop computer 1 is connected to the wireless receiving module 2 via a USB interface; the limit leg 12 of the heat-insulating bracket 5 is inserted into the limit hole of the electronic weighing scale 4; the wireless sending module 3 is connected to the RS232 data interface of the electronic weighing scale 4; and the dedicated test software is installed in the laptop computer 1.

[0026] 1. Hardware composition

[0027] The electronic weighing scale 4 used in the present invention has a measurement accuracy of 0.5g and a measurement range of 15kg, which can meet the test requirements of common smoking components; its measurement data can be transmitted in real time through the RS232 serial port at a sampling frequency of 30Hz.

[0028] Taking into account the factors such as the changeable wind direction in the test field and the large diffusion range of the smoke screen test object, a wireless serial port data transmission module is used to transmit the weight loss data of the test object in real time; the wireless sending module 3 and the wireless receiving module 2 use LoRa spread spectrum modulation frequency hopping technology, which has a longer transmission distance and better anti-interference ability.

[0029] Since the shell temperature is high and flames are ejected from the smoke outlet during the test, a heat-insulating bracket 5 is designed to prevent high temperature from damaging the test device. The functions of the heat-insulating bracket 5 include: isolating the high temperature of the test sample, limiting the displacement of the test sample, and transmitting the weight of the test sample to the electronic weighing scale 4. The test sample is placed in the limiting groove 11 of the heat-insulating bracket 5, and the smoke outlet of the test sample is upward or horizontal.

[0030] The heat-insulating bracket 5 is composed of a connecting bolt 6, a load-bearing layer 7, a heat-insulating layer 8, a mounting layer 9, a locking bolt 10, a limiting groove 11, and a limiting support leg 12. The load-bearing layer 7 is a 1 mm thick steel plate, and a limiting groove 11 for placing the test sample is installed on its upper surface. The heat-insulating layer 8 is a 10 mm thick aluminum silicate fiberboard. The mounting layer 9 is a 1 mm thick steel plate, and four limiting support legs 12 are installed on its lower surface. The locking bolt 10 is used to fix the limiting groove 11. Each structural layer is fixed as a whole using 8 connecting bolts 6.

[0031] The necessary software in the notebook computer 1 includes: Windows XP 32-bit operating system, Microsoft Word, and special testing software.

[0032] 2. Software Design

[0033] The software part is dedicated testing software.

[0034] The dedicated test software is developed using Visual Basic 6.0 under Windows XP 32-bit operating system, and can also be designed using languages ​​such as C# to enable it to run on 64-bit operating systems. Figure 3 shown.

[0035] The software includes four functional modules: parameter setting, weight loss test, data processing, and usage help.

[0036] The parameter setting module implements serial communication settings, test product information settings, test mode settings, acquisition display mode settings, test report settings, etc. The serial communication function is used to detect the available serial port of the laptop and set parameters such as baud rate; the test product information setting function is used to input text information such as the test product name and test conditions, and save it in the same file with the test data; the test mode setting function is used to set the test mode, including two modes: weight-time characteristics and weight-time characteristics; the acquisition display mode setting is used to set the mode of real-time display of data during data collection, including digital mode and curve mode; the test report setting is used to set the data display content when generating the test report, which can realize equal interval output and data output at specified time points.

[0037] The weight loss test module realizes the functions of collecting the initial weight of the test product, collecting weight loss data, displaying the weight loss data in real time, and saving data. The initial weight of the test product is collected before igniting the test product. This data is the arithmetic mean of the data sampled for 3 consecutive seconds; after igniting the test product, the weight loss data collection starts. When it is the weight loss-time characteristic mode, the real-time weight loss of the test product is calculated based on the difference between the initial weight of the test product and the weight data collected by the computer in real time; the real-time display function of weight loss data is used to display real-time data in the form of numbers or curves during the test process; the data saving function is used to store the test product information and the collected data in a data file in the form of a txt document. In order to ensure the test accuracy, the arithmetic mean of the collected data of every 3 electronic weighing scales 4 is used as one final valid data, so the actual collection frequency of the present invention is 10Hz.

[0038] The data processing module realizes functions such as retrieving test data, drawing weight loss-time curve, curve interception, characteristic data calculation, and generating report sheets. The function of retrieving test data can import text-formatted test data into the memory of the laptop computer 1, and display the test product information and data curve on the software interface; the weight loss-time curve drawing function realizes drawing weight loss-time curve, displaying the current mouse position data, and initializing the curve operation function; the curve interception function is used to remove redundant data and redraw the curve; the characteristic data calculation function is used to calculate the weight loss data at the corresponding time point according to the parameters in the test report setting item in the parameter setting module; the report sheet generation function is used to save the test product information, weight loss-time curve, characteristic data and other information in the word document format as a test report sheet.

[0039] The help module is used to open the help document to assist testers in completing the test.

[0040] In order to illustrate the significance of the present invention to the design and production of combustion type smoke generating elements, the weight loss-time curve ( Figure 4 ) are analyzed as follows:

[0041] Figure 4 In (a), the weight loss data from 0 to 125 seconds is stable, and the weight loss per unit time from 125 to 150 seconds increases. This means that the test sample burns more violently in the 125 to 150 second range than in the 0 to 125 second range. In order to improve product stability, the density of the compressed medicine layer on the inner side (afterburning) of the smoke-generating element should be increased or other measures should be taken.

[0042] Figure 4 In (b), the weight loss per unit time increases from 0 to 30 seconds, and the data in the latter section is stable. This means that the test product burns violently from 0 to 30 seconds. In order to improve product stability, the density of the compressed medicine layer on the outer side (first burning) of the smoke-generating element should be increased or other measures should be taken.

Claims

1. A combustion type smoke element weight loss test device, characterized in that: Including hardware and software parts; The hardware part is composed of a laptop computer (1), a wireless receiving module (2), a wireless transmitting module (3), an electronic weighing scale (4), and a heat-insulating bracket (5); the heat-insulating bracket (5) is composed of a load-bearing layer (7), a heat-insulating layer (8), a mounting layer (9), a locking bolt (10), a limit groove (11), and a limit support leg (12); the load-bearing layer (7) is a thick steel plate, and a limit groove (11) for placing a test object is installed on its upper surface; the heat-insulating layer (8) is a thick aluminum silicate fiberboard, and the mounting layer (9) is a thick steel plate, and four limit support legs (12) are installed on the lower surface of the mounting layer (9); the locking bolt (10) is used to fix the limit groove (11), and each structural layer is fixed together by connecting bolts; The laptop computer (1) is connected to the wireless receiving module (2) via a USB interface; the limiting support leg (12) of the heat-insulating bracket (5) is inserted into the limiting hole of the electronic weighing scale (4); the wireless transmitting module (3) is connected to the RS232 data interface of the electronic weighing scale (4); The software part is a dedicated test software; the dedicated test software is installed in a laptop computer (1); the dedicated test software includes four functional modules: parameter setting, weight loss test, data processing, and usage help; The parameter setting module implements serial communication settings, test product information settings, test mode settings, acquisition display mode settings, and test report settings; the serial communication function is used to detect the available serial port of the laptop and set the baud rate parameters; the test product information setting function is used to input the test product name and test conditions text information, and save it in the same file with the test data; the test mode setting function is used to set the test mode, including two modes: weight-time characteristics and weight-time characteristics; the acquisition display mode setting is used to set the mode of real-time display of data during data acquisition, including digital mode and curve mode; the test report setting is used to set the data display content when generating a test report, and realize equal interval output and data output at specified time points; The weight test module realizes the functions of collecting the initial weight of the test product, collecting the weight loss data, displaying the weight loss data in real time, and saving data; collecting the initial weight of the test product before igniting the test product, and this data is the arithmetic average of the data sampled for 3 seconds in a row; collecting the weight loss data after igniting the test product, and when it is the weight loss-time characteristic mode, the real-time weight loss of the test product is calculated based on the difference between the initial weight of the test product and the weight data collected by the computer in real time; the real-time display function of weight loss data is used to display real-time data in the form of numbers or curves during the test process; the data saving function is used to store the test product information and the collected data in a data file in the txt document format; The data processing module realizes the retrieval of test data, the drawing of weight loss-time curve, curve interception, characteristic data calculation, and report generation; the test data retrieval function can import the test data in text form into the memory of the laptop computer (1), and display the test product information and data curve on the software interface; the weight loss-time curve drawing function realizes the drawing of weight loss-time curve, the display of the mouse current position data, and the initialization of the curve operation function; the curve interception function is used to remove redundant data and redraw the curve; the characteristic data calculation function is used to calculate the weight loss data at the corresponding time point according to the parameters in the test report setting item in the parameter setting module; the report generation function is used to save the test product information, weight loss-time curve, and characteristic data information in the word document format as a test report; The help module is used to open the help document to assist testers in completing the test.

2. A combustion type smoke element weight loss test device according to claim 1, characterized in that: In order to ensure the test accuracy, the arithmetic mean of the data collected by every three electronic weighing scales (4) is taken as one final valid data, and the actual collection frequency is 10 Hz.

3. A combustion type smoke element weight loss test device according to claim 1, characterized in that: The load-bearing layer (7) is a 1 mm thick steel plate.

4. A combustion type smoke element weight loss test device according to claim 1, characterized in that: The heat insulation layer (8) is a 10 mm thick aluminum silicate fiberboard.

5. A combustion type smoke element weight loss test device according to claim 1, characterized in that: The mounting layer (9) is a 1 mm thick steel plate.

Images