Zoom type thermogravimetric analysis device

Abstract

The utility model belongs to the technical field of thermogravimetric analysis, and particularly relates to a zoom type thermogravimetric analysis device, which comprises a furnace body, a laser, an infrared thermal imaging camera, a heating vessel, an electronic scale and a computer, a door is arranged on the front side of the furnace body, the zoom type thermogravimetric analysis device is characterized in that the electronic scale is arranged in the furnace body, a heat insulation pad is arranged on a tray of the electronic scale, and the heating vessel is arranged on the heat insulation pad; the laser is vertically arranged on a laser guide rail of a vertical frame at the top of the furnace body, an upper lens guide rail is further arranged on the vertical frame below the laser, an upper lens is movably connected with the upper lens guide rail through a bracket, a lower lens is arranged on a hole in the furnace body below the upper lens, the heating vessel is located below the lower lens, and the area of a laser focus falling on the heating vessel can be adjusted. Compared with the prior art, the utility model has the beneficial effects that the light spot area of laser projection is adjusted by adopting the efficient carbon dioxide laser generator and the lifting adjusting mechanism, so that materials in the experiment vessel are heated more uniformly and fully, and the repeatability of experiment data is good.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of thermogravimetric analysis, especially relates to a zooming thermogravimetric analysis device. BACKGROUND

[0002] Thermogravimetry is a technique for measuring the relationship between mass and temperature of a substance under programmed temperature control. The curve obtained from the thermogravimetry test is called a thermogravimetric curve (TG curve), which has mass as the vertical coordinate, indicating mass reduction from top to bottom, and has temperature (or time) as the horizontal coordinate, indicating temperature (or time) increase from left to right.

[0003] A thermogravimetric analyzer is an instrument for detecting the temperature-mass change relationship of a substance using thermogravimetry. When the measured substance undergoes sublimation, vaporization, decomposition of gas, or loss of crystalline water during heating, the mass of the measured substance changes. At this time, the thermogravimetric curve is not a straight line but has a decline. By analyzing the thermogravimetric curve, it can be known at what temperature the measured substance changes, and according to the weight loss, it can be calculated how much substance is lost.

[0004] Laser head heating is heating using laser energy, and its principle is to focus laser beams on a small point to make the energy density of the laser beams on the point very high, thereby increasing the temperature of the point. Laser head heating has the advantages of high efficiency, precision, and non-contact. Chinese invention patent No. 201810433631.0; 108593483B discloses a high-temperature-rate thermogravimetric analysis system and method based on laser heating, which includes a heating part, a measuring part, and a computer. The heating part includes a laser, a microlens array, a lens, graphite, a half-reflective half-transmissive lens, and a full-reflective mirror group. The measuring part includes a thermal imager, a sealed box, and an electronic balance. The laser beams provided by the laser pass through the microlens array, the lens, and the graphite in sequence. The laser beams emitted from the graphite pass through the half-reflective half-transmissive lens, with one part irradiating the front surface of the measured object and the other part irradiating the rear surface of the measured object. The thermal imager monitors the temperature rise of the front and rear surfaces of the measured object. The electronic balance is used for weighing the measured object. The computer synchronously collects and records the readings of the laser parameters, the thermal imager, and the electronic balance.

[0005] The existing laser heating thermogravimetric analyzer has the problem of complex laser light path design, which makes the equipment cost high. Due to the difference in experimental material types, the area of the material spread in the experimental dish has a large difference. The fixed laser projection path cannot irradiate some materials, which cannot achieve the purpose of uniform heating, thereby affecting the repeatability of experimental data. UTILITY MODEL CONTENTS

[0006] The utility model discloses a zooming thermal gravimetric analysis device which overcomes the shortcomings of the prior art, adopts an efficient carbon dioxide laser generator, and can realize zooming adjustment of the laser projection spot with the help of a lifting adjustment mechanism, so that the material is heated sufficiently, and the experimental data meet the repeatability requirement.

[0007] To achieve the above object, the utility model discloses the following technical scheme:

[0008] A zooming thermal gravimetric analysis device, comprising a furnace body, an infrared thermal imaging camera, a laser, a heating dish, an electronic scale and a computer, the computer is connected with the laser, the infrared thermal imaging camera and the electronic scale through a data line, the laser is connected with the furnace body, the front side of the furnace body is provided with an open door, the electronic scale is arranged in the furnace body, an insulating pad is arranged on the tray of the electronic scale, and a heating dish is arranged on the insulating pad.

[0009] Further, the laser is a carbon dioxide laser, and the power is 30W-60W.

[0010] Further, the door body on the front side of the furnace body is provided with heat-resistant glass for convenient observation.

[0011] Further, the electronic scale is an electronic precision liquid crystal scale, and the specification is 120g / 0.1mg.

[0012] Further, the laser guide rail and / or the upper lens guide rail are two, and are arranged on the left and right respectively.

[0013] Further, the cross section of at least one of the guide rails is V-shaped.

[0014] Further, the insulating pad is a silica aerogel felt insulating pad, and the height is not less than 50mm.

[0015] Compared with the prior art, the utility model has the beneficial effects that:

[0016] 1) Adopt high efficiency carbon dioxide laser generator, the zooming adjusting mechanism can realize the zoom adjustment of laser, the laser spot area on the heating dish can be adjusted, the heating of the material in the experimental dish is more uniform and sufficient, the experimental data repeatability is good, and the requirements of the thermogravimetric method experiment are met;

[0017] 2) Can be suitable for various experimental materials, the flattened areas of the materials with different densities are not the same under the same weight, at this time, the laser spot projected on the material surface needs to be adjusted before the experiment until the material is completely covered by the laser spot, and then the experiment is started, and the adjustment process is manually participated, so that the stability of the adjustment effect can be ensured. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic view of an embodiment of the utility model, and the front side furnace door is in an open state;

[0019] Figure 2 is Figure 1 a rear view of

[0020] Figure 3 is Figure 1 a three-dimensional schematic view of

[0021] In the drawing: 1-furnace body, 2-laser, 3-heating dish, 4-electronic scale, 5-computer, 6-door body, 7-heat insulation pad, 8-stand, 9-laser guide rail, 10-infrared thermal imaging camera, 11-upper lens, 12-upper lens guide rail, 13-carrier, 14-lower lens, 15-upper rack, 16-lower rack, 17-upper wheel shaft, 18-upper gear, 19-laser lifting hand wheel, 20-lower wheel shaft, 21-lower gear, 22-upper lens lifting hand wheel. DETAILED DESCRIPTION

[0022] The technical solutions of the utility model will be described clearly and completely in combination with specific embodiments, and obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments.

[0023] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the specific embodiments needed in the specific embodiment or prior art description will be simply introduced, and obviously, the specific embodiments in the following description are some embodiments of the utility model, and other specific embodiments can also be obtained by those skilled in the art without creative labor on the premise.

[0024] The components of the embodiments of the present application generally described and shown in the detailed description herein can be arranged and designed in countless different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the detailed description is not intended to limit the scope of the application, but is merely representative of selected embodiments of the present application.

[0025] See Figures 1-3 , the present application is a zooming thermal analysis device embodiment structure diagram, including furnace body 1, laser 2, heating dish 3, electronic scale 4, infrared thermal imaging camera 10 and computer 5, furnace body 1 and computer 5 are placed on the workbench, computer 5 is connected with laser 2, infrared thermal imaging camera 10, electronic scale 4 through data line, laser 2 is connected with furnace body 1, the front side of furnace body 1 is equipped with door, and the door body 6 on the front side of furnace body 1 is equipped with heat-resistant glass for convenient observation.Electronic scale 4 is arranged in furnace body 1, and heat insulation pad 7 is arranged on the tray of electronic scale 4;heat insulation pad 7 is provided with heating dish 3;laser 2 is vertically arranged on the laser guide rail 9 of the vertical frame 8 on the top of furnace body 1, and the vertical frame 8 below laser 2 is also provided with upper lens guide rail 12;upper lens 11 is movably connected with upper lens guide rail 12 through bracket 13;the hole in furnace body 1 below upper lens 11 is provided with lower lens 14;heating dish 3 is located below lower lens 14;the area of laser spot falling on heating dish 3 can be adjusted;laser 2 is connected with upper rack 15, and upper rack 15 is engaged with upper gear 18 connected to the back of vertical frame 8 through upper wheel shaft 17;one end of upper wheel shaft 17 is connected with laser lifting hand wheel 19;lower rack 16 is arranged on the back of bracket 13, and lower rack 16 is engaged with lower gear 21 connected to the back of vertical frame 8 through lower wheel shaft 20;one end of lower wheel shaft 20 is connected with upper lens lifting hand wheel 22.Laser guide rail 9 and upper lens guide rail 12 are both two, and are arranged left and right respectively.The cross section of guide rail is V-shaped, which can fully ensure the stability of the lifting movement of laser 2 and upper lens 11.Adjusting the distance between upper lens 11 and laser 2 and lower lens 14 plays a role in focusing, so that a larger size laser spot is obtained, and the material can be uniformly heated.

[0026] In the embodiment, laser 2 is a carbon dioxide laser with a power of 30W-60W.Infrared thermal imaging camera 10 is arranged above furnace body 1 and faces heating dish 3, and temperature is collected in a thermal imaging manner.Electronic scale 4 is an electronic precision liquid crystal scale produced by Shanghai Shunyu Hengping Scientific Instrument Co., Ltd., with a specification of 120g / 0.1mg.Heat insulation pad 7 is a silica aerogel felt heat insulation pad with a height not less than 50mm, which can prevent the influence of heating temperature on electronic scale.

[0027] In the embodiment, taking ash test of biomass as an example, the process of referring to GB / T 28731-2012 method of industrial analysis of solid biomass fuel is as follows: the first stage: sample 10-20mg is placed in the heating pan 3 at room temperature (below 100℃), the sample is heated for not less than 50min to 250℃, and is kept at this temperature for 60min; the second stage: from 250℃ to 550℃ for not less than 60min, and is kept at this temperature interval for 120min; the third stage: 550℃ is kept for 30min (check combustion). The slow ash data is obtained by comparing the weight of the sample after burning and the weight before burning.

[0028] The experiment is carried out in the set temperature range, and the mass change is recorded. The time of this stage depends on the characteristics of the sample and the experimental conditions. By reasonably selecting the experimental conditions and optimizing the experimental design, the experimental time can be shortened as much as possible while ensuring the accuracy of the data. After the door body 6 on the furnace body 1 is closed, the furnace body is in a closed state, if different atmosphere environment is needed, the way of injecting gas into the furnace body can be used to obtain, at this time, the thermal performance of the material in different gas (such as nitrogen, argon, etc.) environment can be completed.

[0029] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A zooming type thermogravimetric analysis device comprising a furnace body, a laser, an infrared thermal imaging camera, a heating pan, an electronic scale and a computer, the computer being connected with the laser, the infrared thermal imaging camera and the electronic scale through data lines, the laser being connected with the furnace body, and the front side of the furnace body being provided with an opening door, characterized in that, The electronic scale is arranged in the furnace body, the tray of the electronic scale is provided with a heat insulation pad, and the heat insulation pad is provided with a heating pan; The laser is vertically arranged on the laser guide rail of the stand at the top of the furnace body, and an upper lens guide rail is further arranged on the stand below the laser. The upper lens is movably connected with the upper lens guide rail through a bracket. A lower lens is arranged in the hole of the furnace body below the upper lens. The heating pan is below the lower lens, and the area of the laser spot falling on the heating pan is adjustable. The back of the laser is connected with an upper rack, the upper rack is engaged with an upper gear connected with the back of the stand through an upper shaft, and one end of the upper shaft is connected with a laser lifting hand wheel. The bracket back is provided with a lower rack, the lower rack is engaged with a lower gear connected with the back of the stand through a lower shaft, and one end of the lower shaft is connected with an upper lens lifting hand wheel.

2. A variable-temperature thermogravimetric analysis apparatus according to claim 1, wherein The laser is a carbon dioxide laser with a power of 30W-60W.

3. A variable-temperature thermogravimetric analysis apparatus according to claim 1, wherein The door body on the front side of the furnace body is provided with heat-resistant glass for convenient observation.

4. The variable-temperature thermogravimetric analysis apparatus according to claim 1, wherein The electronic scale is an electronic precision liquid crystal scale with a specification of 120g / 0.1mg.

5. The variable-temperature thermogravimetric analysis apparatus according to claim 1, wherein The laser guide rail and / or the upper lens guide rail are two, which are arranged on the left and right respectively.

6. A variable-temperature thermogravimetric analysis apparatus according to claim 5, wherein The cross section of at least one of the guide rails is V-shaped.

7. The variable-temperature thermogravimetric analysis apparatus of claim 1, wherein The heat insulation pad is a silica aerogel felt heat insulation pad with a height not less than 50mm.

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