Heating device of thermal weight loss analyzer

Abstract

The utility model discloses a heating device of a thermal weight loss analyzer. The heating device comprises a base, an electronic balance body, a heat preservation shell, a sample tube and a heating mechanism, the electronic balance body is horizontally fixed to the upper end of the base, a heat preservation shell is fixed to the upper end of the electronic balance body, and the heating mechanism comprises a first heat conduction pipe, a second heat conduction pipe, a furnace body and a heat supply assembly; a furnace body is fixedly arranged in the heat preservation shell, a first heat conduction pipe and a second heat conduction pipe are vertically and fixedly arranged in the furnace body in a spaced mode, the first heat conduction pipe and the second heat conduction pipe are communicated with the heat supply assembly, a cover body is detachably and fixedly arranged on an opening of the heat preservation shell, and two sample pipes are vertically and detachably arranged on the cover body. According to the heating device of the thermal weight loss analyzer, a sample in the sample tube can be rapidly heated, the heating efficiency is improved, and the heated sample tube and the sample in the sample tube can be rapidly cooled, so that a worker is prevented from being scalded when the sample tube and the sample are taken out.

Description

Technical Field

[0001] The utility model relates to the technical field of thermogravimetric analyzers, in particular to a heating device of a thermogravimetric analyzer. Background Art

[0002] A gravimetric analyzer is an instrument that uses thermogravimetry to detect the temperature-mass change relationship of a substance. Thermogravimetry measures the change in the mass of a substance with temperature (or time) under program temperature control. When the substance being measured sublimates, vaporizes, decomposes into gas, or loses crystal water during heating, the mass of the substance being measured will change. At this time, the thermogravimetric curve is not a straight line but decreases. By analyzing the thermogravimetric curve, we can know at what degree the substance being measured changes, and based on the weight loss, we can calculate how much substance is lost (such as crystal water in CuSO4·5H2O).

[0003] After searching: Chinese patent application number is "CN201920325928.5", which discloses a high-efficiency thermogravimetric analyzer, including a base cabinet and a controller arranged inside the base cabinet, an experimental group electronic balance and a control group electronic balance are symmetrically arranged inside the base cabinet, and the upper ends of the experimental group electronic balance and the control group electronic balance are respectively provided with bases; support rods are vertically fixed on the bases, and sample containers are horizontally fixed on the upper ends of the support rods; a lifter is provided at the upper end of the controller corresponding to the base cabinet, and a box body is fixed on the lifting arm of the lifter; a group of symmetrically distributed heating furnaces are arranged inside the box body, and a group of protective covers are vertically fixed on the box body above the heating furnaces, and the bottom of the protective covers extends to the outside of the bottom of the box body; an air inlet is provided on one side of the box body near the bottom, and a sealing cover is connected to the upper end of the box body, and an air outlet is provided on the sealing cover.

[0004] The inventor discovered the following problems in the prior art during the implementation of the present invention:

[0005] The existing technology heats the samples inside the furnace body. In the early stage of heating, the space inside the furnace body is large, which causes the internal environment temperature to rise slowly, reducing the heating efficiency. After the heating is completed, the temperature inside the furnace body is high and the heat dissipation effect is poor, so the staff can easily be burned when taking out the samples.

[0006] Therefore, it is an urgent problem to be solved by the present invention to provide a heating device for a thermal gravimetric analyzer which can quickly heat up the sample in the sample tube through a heating mechanism during use, thereby improving the heating efficiency and heating effect, and can also quickly cool the sample tube and the sample inside it after heating to prevent the staff from being scalded when taking out the sample tube and the sample. Utility Model Content

[0007] In view of the above technical problems, the purpose of the utility model is to overcome the problem that in the prior art, a furnace body is used to heat the sample inside the furnace body, but in the early stage of heating, the space inside the furnace body is large, resulting in a slow rise in the internal environment temperature, which reduces the heating efficiency, and after the heating is completed, the temperature inside the furnace body is high and the heat dissipation effect is poor, so the staff is easily scalded when taking out the sample. Thus, a heating device for a thermal gravimetric analyzer is provided, which can quickly heat the sample in the sample tube through a heating mechanism during use, improve the heating efficiency and heating effect, and can also quickly cool the sample tube and the sample inside the sample after heating is completed, so as to prevent the staff from being scalded when taking out the sample tube and the sample.

[0008] In order to achieve the above-mentioned object, the utility model provides a heating device for a thermogravimetric analyzer, the heating device for the thermogravimetric analyzer comprising: a base, an electronic balance body, a heat-insulating shell, a sample tube and a heating mechanism;

[0009] The electronic balance body is horizontally fixed on the upper end of the base, and a heat-insulating shell with an opening facing upward is fixedly arranged on the upper end of the electronic balance body. The temperature-raising mechanism includes: a No. 1 heat-conducting pipe, a No. 2 heat-conducting pipe, a furnace body and a heating component; wherein,

[0010] A furnace body with an opening facing upward is fixedly arranged in the thermal insulation shell, and a spiral heat pipe No. 1 and a heat pipe No. 2 are fixedly arranged in the furnace body at intervals and vertically. The heat pipe No. 1 and the heat pipe No. 2 are respectively connected to the heat supply component to continuously supply hot air to the heat pipe No. 1 and the heat pipe No. 2, and a cover body that can be covered on the opening is detachably fixedly arranged on the opening of the thermal insulation shell, and two sample tubes that can respectively extend into the interior of the heat pipe No. 1 and the heat pipe No. 2 and fit with their inner walls are vertically and detachably arranged on the cover body.

[0011] Preferably, the heating component comprises: a heating box, a heating pipe and an air pump; wherein,

[0012] A heating box is fixedly arranged horizontally on the outer wall of the heat-insulating shell, and a serpentine heating tube is fixedly arranged inside the heating box. One end of the heating tube is fixedly connected to the bottom ports of the No. 1 heat-conducting tube and the No. 2 heat-conducting tube respectively, and the other end thereof extends from the top of the heating box and is fixedly connected to the output end of the air pump fixed on the top thereof, and the input end of the air pump is fixedly connected to the top ends of the No. 1 heat-conducting tube and the No. 2 heat-conducting tube respectively through a connecting pipe, and the input end of the air pump is also connected to and fixedly arranged with an air inlet pipe.

[0013] Preferably, the heating component further comprises: a heating plate; wherein,

[0014] A heating plate is fixedly arranged inside the heating box, the heating pipe is fixed on one side of the heating plate, and a switch valve is fixedly arranged on the air inlet pipe.

[0015] Preferably, an air outlet pipe connected to the connecting pipe is vertically fixedly provided on the connecting pipe, a No. 1 solenoid valve is provided on the air outlet pipe, and a No. 2 solenoid valve is fixedly provided on one end of the air outlet pipe close to the air pump.

[0016] Preferably, each of the sample tubes is detachably mounted on the cover body through a fixing assembly, wherein the fixing assembly comprises: a positioning rod and a fixing plate; wherein,

[0017] Two assembly grooves for assembling the two sample tubes are formed on the cover body facing the heat-insulating shell, which are spaced apart and partially recessed inward, and two fixing plates that are close to or away from each other are horizontally and movably arranged in each assembly groove. A plug hole that is compatible with the positioning rod is horizontally penetrated on each fixing plate, and two positioning rods are symmetrically and horizontally fixedly arranged on both sides of the tube mouth of the sample tube.

[0018] Preferably, the fixing assembly further comprises: a guide rod and a tension spring; wherein,

[0019] A guide rod is horizontally fixed in each assembly groove, two fixing plates are slidably arranged on each guide rod at intervals, tension springs are respectively sleeved on both ends of the guide rod, and both ends of each tension spring are respectively fixed on the fixing plate and the assembly groove.

[0020] Preferably, at least two pairs of handles are fixedly arranged at intervals on the upper end of the cover body.

[0021] Preferably, an exhaust pipe communicating with the interior of the heat-insulating shell is vertically penetrated through the cover body, and an air injection pipe communicating with the interior of the heat-insulating shell is horizontally penetrated through the side wall of the heat-insulating shell.

[0022] According to the above technical solution, the heating device of the thermogravimetric analyzer provided by the utility model has the following beneficial effects when in use:

[0023] (1) Place the sample to be tested into a sample tube, fix the sample tube on the cover, and cover the cover on the open opening of the heat-insulating shell so that the sample tube containing the sample extends into the first heat-conducting tube and the second heat-conducting tube in the furnace body, so that the outer walls of the two sample tubes are in contact with the first heat-conducting tube and the second heat-conducting tube. Then, the sample in the sample tube is heated by the furnace body.

[0024] (2) Since the temperature in the existing furnace rises very slowly during the initial heating, in order to quickly increase and uniformly heat the sample tube, the heating component can continuously supply heated gas to the first heat pipe and the second heat pipe respectively, so that the heated gas enters the first heat pipe and the second heat pipe in a spiral shape from bottom to top and leaves from the top of the first heat pipe and the second heat pipe, and then heat exchange can be performed on the first heat pipe and the second heat pipe, so that the temperature of the two rises rapidly, so as to heat the sample tube inside each. Since the first heat pipe and the second heat pipe are spiral, the sample tube can be evenly heated, which can assist the furnace body in heating the sample tube and the sample stored therein, thereby improving the heating effect.

[0025] (3) When the sample heating is completed, the heat supply component uses the flowing gas to pass through the first gas pipe and the second heat pipe to perform heat exchange, so as to cool the sample tube and the sample therein.

[0026] Therefore, the utility model can quickly heat the sample in the sample tube through the heating mechanism, improve the heating efficiency and heating effect, and can also quickly cool the sample tube and the sample inside it after heating to prevent the staff from being scalded when taking out the sample tube and the sample.

[0027] Other features and advantages of the utility model will be described in detail in the subsequent specific implementation mode; and the parts not involved in the utility model are the same as the prior art or can be implemented by using the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the accompanying drawings:

[0029] Figure 1 It is a structural schematic diagram of a heating device of a thermogravimetric analyzer provided in a preferred embodiment of the utility model;

[0030] Figure 2 It is a schematic diagram of the internal structure of a heating device of a thermogravimetric analyzer provided in a preferred embodiment of the utility model;

[0031] Figure 3 It is a structural schematic diagram of a temperature raising mechanism of a heating device of a thermogravimetric analyzer provided in a preferred embodiment of the utility model;

[0032] Figure 4It is a schematic diagram of the assembly of a sample tube and a cover body of a heating device of a thermogravimetric analyzer provided in a preferred embodiment of the utility model;

[0033] Figure 5 yes Figure 4 Structural cross-section view.

[0034] Description of Reference Numerals

[0035] 1. Base; 2. Electronic balance body; 3. Insulation shell; 4. Sample tube; 5. Heating mechanism; 501. Heat pipe No. 1; 502. Heat pipe No. 2; 503. Furnace body; 504. Heating component; 5041. Heating box; 5042. Heating plate; 5043. Heating tube; 5044. Air pump; 6. Cover; 7. Guide rod; 8. Positioning rod; 9. Fixing plate; 10. Tension spring. DETAILED DESCRIPTION

[0036] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0037] like Figure 1-5 As shown, the utility model provides a heating device for a thermogravimetric analyzer, the heating device for the thermogravimetric analyzer comprises: a base 1, an electronic balance body 2, a heat-insulating shell 3, a sample tube 4 and a heating mechanism 5;

[0038] The electronic balance body 2 is horizontally fixed on the upper end of the base 1, and a heat-insulating shell 3 with an opening facing upward is fixedly arranged on the upper end of the electronic balance body 2. The heating mechanism 5 includes: a first heat conducting pipe 501, a second heat conducting pipe 502, a furnace body 503 and a heating component 504; wherein,

[0039] A furnace body 503 with an opening facing upward is fixedly arranged in the heat-insulating shell 3, and a spiral heat-conducting pipe No. 1 501 and a spiral heat-conducting pipe No. 2 502 are fixedly arranged in the furnace body 503 at intervals and vertically. The heat-conducting pipe No. 1 501 and the heat-conducting pipe No. 2 502 are respectively connected to the heat supply component 504 to continuously supply hot air to the heat-conducting pipe No. 1 501 and the heat-conducting pipe No. 2 502, and a cover body 6 that can be covered on the opening is detachably fixedly arranged on the opening of the heat-insulating shell 3, and two sample tubes 4 that can respectively extend into the interior of the heat-conducting pipe No. 1 501 and the heat-conducting pipe No. 2 502 and fit with their inner walls are vertically and detachably arranged on the cover body 6.

[0040] In the above solution, the sample tube 4 can be made of heat-conducting metal material, and the first heat-conducting tube 501 and the second heat-conducting tube 502 can be made of metal heat-conducting materials such as aluminum or copper, so that they have higher thermal conductivity.

[0041] In the above scheme, when in use, the sample to be tested is placed in the sample tube 4, and the sample tube 4 is fixed on the cover 6, and the cover 6 is covered on the open part of the heat-insulating shell 3, so that the sample tube 4 containing the sample extends into the first heat-conducting tube 501 and the second heat-conducting tube 502 in the furnace body 503, so that the outer walls of the two sample tubes 4 are in contact with the first heat-conducting tube 501 and the second heat-conducting tube 502. Subsequently, the sample in the sample tube 4 is heated by the furnace body 503. And the heated sample is weighed by the electronic balance body 2.

[0042] Since the temperature in the existing furnace body 503 rises very slowly during the initial heating, in order to quickly increase and uniformly heat the sample tube 4, the heating component 504 can continuously supply heated gas to the first heat pipe 501 and the second heat pipe 502 respectively, so that the heated gas enters the spiral first heat pipe 501 and the second heat pipe 502 from bottom to top and leaves from the top of the two, and then heat exchange can be performed on the first heat pipe 501 and the second heat pipe 502 to quickly increase the temperature of the two, so as to heat the sample tube 4 inside each of them. Since the first heat pipe 501 and the second heat pipe 502 are spiral, the sample tube 4 can be evenly heated and heated, which can assist the furnace body 503 in heating the sample tube 4 and the sample stored therein, thereby improving the heating effect.

[0043] In a preferred embodiment of the present utility model, the heating component 504 includes: a heating box 5041, a heating pipe 5043 and an air pump 5044; wherein,

[0044] A heating box 5041 is fixedly arranged horizontally on the outer wall of the heat-insulating shell 3, and a serpentine heating tube 5043 is fixedly arranged inside the heating box 5041. One end of the heating tube 5043 is fixedly connected to the bottom ports of the first heat-conducting tube 501 and the second heat-conducting tube 502, respectively, and the other end thereof extends from the top of the heating box 5041 and is fixedly connected to the output end of the air pump 5044 fixed on the top thereof. The input end of the air pump 5044 is fixedly connected to the top ends of the first heat-conducting tube 501 and the second heat-conducting tube 502, respectively, through connecting pipes, and the input end of the air pump 5044 is also connected to and fixedly arranged with an air inlet pipe.

[0045] In the above scheme, when in use, the air pump 5044 is started to suck the external gas into the heating tube 5043 through the air inlet pipe for heating treatment, so that the heated gas enters the first heat pipe 501 and the second heat pipe 502 to heat both.

[0046] The heated gas respectively enters the No. 1 heat pipe 501 and the No. 2 heat pipe 502 and enters the heating pipe 5043 in the heating box 5041 through the air pump 5044 from the top of the two for reuse. Since the gas coming out of the No. 1 heat pipe 501 and the No. 2 heat pipe 502 still has residual heat, the gas coming out of the No. 1 heat pipe 501 and the No. 2 heat pipe 502 is reused so that the gas can be quickly heated by the heating plate 5042, thereby shortening the heating time.

[0047] In a preferred embodiment of the present invention, the heating component 504 further includes: a heating plate 5042; wherein,

[0048] A heating plate 5042 is fixedly disposed inside the heating box 5041 , the heating pipe 5043 is fixed on one side of the heating plate 5042 , and a switch valve is fixedly disposed on the air intake pipe.

[0049] In the above scheme, when in use, the switch valve is opened to connect the air intake pipe with the outside, the air pump 5044 is started to suck the outside gas into the heating tube 5043 through the air intake pipe, and the gas entering the heating tube 5043 is heated by the heating plate 5, so that the heated gas enters the No. 1 heat conduction tube 501 and the No. 2 heat conduction tube 502 to heat both of them.

[0050] The air pump 5044 can close the switch valve when it sucks an appropriate amount of external air into the heating tube 504 to isolate the air inlet pipe from the external environment, so that the gas entering the heating tube 5043 can circulate and continuously heat the used gas to prevent the external gas from mixing in. Since the temperature of the external gas is lower than the temperature of the gas after use, the temperature of the mixed external gas will decrease after mixing with the used gas, which will affect the heating effect, so that the reheated gas can enter the No. 1 heat pipe 501 and the No. 2 heat pipe 502 to continuously heat the sample tube 4 and the sample inside it.

[0051] In addition, a heating plate converts electrical energy into thermal energy to heat an object, which is a form of electrical energy utilization and is a well-known technology. Therefore, the heating plate 5042 will not be described in detail here.

[0052] In a preferred embodiment of the utility model, an air outlet pipe connected to the connecting pipe is vertically fixedly arranged on the connecting pipe, a No. 1 solenoid valve is arranged on the air outlet pipe, and a No. 2 solenoid valve is fixedly arranged on one end of the air outlet pipe close to the air pump 5044.

[0053] In the above scheme, when the heating component 504 is started to supply hot air to the No. 1 heat pipe 501 and the No. 2 heat pipe 502, the No. 1 solenoid valve on the outlet pipe is closed to isolate it from the external environment, and the No. 2 solenoid valve on the connecting pipe is opened to connect it with the air pump 5044.

[0054] When the sample heating is finished, the No. 1 solenoid valve on the air outlet pipe can be opened to connect it with the external environment, the No. 2 solenoid valve on the connecting pipe and the switch valve on the inlet pipe can be closed, the furnace body 503 and the heating of the heating tube 5043 are stopped, and the air pump 5044 is started to continuously suck the external gas into the heating tube 5043, and enter the No. 1 heat pipe 501 and the No. 2 heat pipe 502 respectively, and enter the connecting pipe from the top of the two and discharge to the outside through the air outlet pipe on the connecting pipe. Therefore, at this time, the heat supply component 504 uses the flowing gas to pass through the No. 1 air pipe 501 and the No. 2 heat pipe 502 to perform heat exchange, so as to cool the sample tube 4 and the sample therein.

[0055] Therefore, the heating component 504 performs the dual functions of heating and cooling, thereby improving its practicality.

[0056] In a preferred embodiment of the present invention, each of the sample tubes 4 is detachably mounted on the cover 6 via a fixing assembly, wherein the fixing assembly comprises: a positioning rod 8 and a fixing plate 9; wherein:

[0057] Two assembly grooves for assembling the two sample tubes 4 are formed on the cover 6 facing the heat-insulating shell 3 at intervals and partially recessed inward, and two fixing plates 9 are horizontally and movably arranged close to or away from each other in each assembly groove, and each fixing plate 9 is horizontally penetrated by a socket adapted to the positioning rod 8, and two positioning rods 8 are symmetrically and horizontally fixedly arranged on both sides of the tube mouth of the sample tube 4.

[0058] In the above scheme, when used, Figure 4 and Figure 5As shown, before heating, the sample tube 4 is placed vertically with the tube mouth facing upward between the two fixing plates 9 located in the same assembly groove, and it is ensured that the positioning rods 8 on both sides of the tube mouth of the sample tube 4 correspond to the two sockets on the two fixing plates 9 respectively, and then the two fixing plates 9 are moved toward the sample tube 4 until the two fixing plates 9 are against the sample tube 4. At the same time, the two positioning rods 8 on the sample tube 4 pass through the two sockets on the two fixing plates 9 respectively, and the operation can be completed. The operation is simple and quick.

[0059] In addition, the cover 6 is made of a transparent material. When the cover 6 is covered on the opening of the heat-insulating shell 3, the fixed sample tube 4 can be accurately inserted into the first heat-conducting tube 501 and the second heat-conducting tube 502 respectively through the transparent cover 6.

[0060] In a preferred embodiment of the present invention, the fixing assembly further comprises: a guide rod 7 and a tension spring 10; wherein,

[0061] A guide rod 7 is horizontally fixed in each assembly groove, and two fixing plates 9 are slidably arranged on each guide rod 7 at intervals. Tension springs 10 are respectively sleeved on both ends of the guide rod 7, and both ends of each tension spring 10 are respectively fixed on the fixing plate 9 and the assembly groove.

[0062] In the above scheme, when in use, the two fixing plates 9 in each assembly groove are moved in opposite directions respectively. During the movement, the two fixing plates 9 compress the corresponding tensioning springs 10 respectively to make them in a compressed state. When the two fixing plates 9 are separated to a suitable position (at this time, the distance between the two is greater than or equal to the diameter of the sample tube 4), the mouth of the sample tube 4 is then facing upward and placed vertically between the two fixed plates 9 after movement, and it is ensured that the positioning rods 8 on both sides of the mouth of the sample tube 4 correspond to the two sockets on the two fixing plates 9 respectively. Then, the two fixing plates 9 are loosened. Under the action of the tensioning springs 10, the two fixing plates approach the sample tube 4 and rest against it, so that the sample tube 4 can be quickly assembled on the cover body 6, which is also convenient for taking and putting materials.

[0063] In a preferred embodiment of the present invention, at least two pairs of handles are fixedly provided at intervals on the upper end of the cover body 6 .

[0064] In the above solution, it is convenient for the staff to take away the cover body 6 by the handle.

[0065] In a preferred embodiment of the present invention, an exhaust pipe communicating with the interior of the heat-insulating shell 3 is vertically penetrated through the cover body 6, and an air injection pipe communicating with the interior of the heat-insulating shell 3 is horizontally penetrated through the side wall of the heat-insulating shell 3.

[0066] In the above solution, the inert gas is introduced into the heat-insulating shell 1 through the gas injection pipe.

[0067] In summary, the heating device of the thermogravimetric analyzer provided by the utility model overcomes the problem in the prior art that the sample inside the furnace is heated by the furnace body, but in the early stage of heating, the space inside the furnace body is large, resulting in a slow rise in the internal environment temperature, which reduces the heating efficiency, and after the heating is completed, the temperature inside the furnace body is high and the heat dissipation effect is poor, so the staff are easily burned when taking out the sample.

[0068] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention.

[0069] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present utility model will not further describe various possible combinations.

[0070] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A heating device for a thermogravimetric analyzer, characterized in that: The heating device of the thermogravimetric analyzer comprises: a base (1), an electronic balance body (2), a heat-insulating shell (3), a sample tube (4) and a temperature-raising mechanism (5); The electronic balance body (2) is horizontally fixed to the upper end of the base (1), and a heat-insulating shell (3) with an opening facing upward is fixedly provided on the upper end of the electronic balance body (2), and the temperature-raising mechanism (5) comprises: a first heat-conducting pipe (501), a second heat-conducting pipe (502), a furnace body (503) and a heating component (504); wherein: A furnace body (503) with an opening facing upward is fixedly arranged in the heat-insulating shell (3), and a first heat-conducting pipe (501) and a second heat-conducting pipe (502) in a spiral shape are fixedly arranged in intervals and vertically in the furnace body (503). The first heat-conducting pipe (501) and the second heat-conducting pipe (502) are respectively connected to the heat supply component (504) to continuously supply hot air to the first heat-conducting pipe (501) and the second heat-conducting pipe (502). A cover body (6) capable of covering the opening is detachably fixedly arranged on the opening of the heat-insulating shell (3), and two sample tubes (4) capable of respectively extending into the first heat-conducting pipe (501) and the second heat-conducting pipe (502) and fitting with the inner walls thereof are vertically and detachably arranged on the cover body (6).

2. The heating device of the thermogravimetric analyzer according to claim 1, characterized in that: The heating component (504) comprises: a heating box (5041), a heating pipe (5043) and an air pump (5044); wherein, A heating box (5041) is fixedly arranged horizontally on the outer wall of the heat-insulating shell (3), and a serpentine heating pipe (5043) is fixedly arranged inside the heating box (5041). One end of the heating pipe (5043) is fixedly connected to the bottom ports of the first heat-conducting pipe (501) and the second heat-conducting pipe (502), respectively, and the other end thereof extends from the top of the heating box (5041) and is fixedly connected to the output end of an air pump (5044) fixed on the top thereof. The input end of the air pump (5044) is fixedly connected to the top ends of the first heat-conducting pipe (501) and the second heat-conducting pipe (502) through a connecting pipe, and the input end of the air pump (5044) is also connected to an air inlet pipe fixedly arranged thereon.

3. The heating device of the thermogravimetric analyzer according to claim 2, characterized in that: The heating component (504) further includes: a heating plate (5042); wherein, A heating plate (5042) is fixedly arranged inside the heating box (5041), the heating pipe (5043) is fixed on one side of the heating plate (5042), and a switch valve is fixedly arranged on the air intake pipe.

4. The heating device of the thermogravimetric analyzer according to claim 2, characterized in that: An air outlet pipe connected to the connecting pipe is vertically fixedly arranged on the connecting pipe, a No. 1 solenoid valve is arranged on the air outlet pipe, and a No. 2 solenoid valve is fixedly arranged at one end of the air outlet pipe close to the air pump (5044).

5. The heating device of the thermogravimetric analyzer according to claim 1, characterized in that: Each of the sample tubes (4) is detachably mounted on the cover (6) via a fixing assembly, wherein the fixing assembly comprises: a positioning rod (8) and a fixing plate (9); wherein: Two assembly grooves for assembling two sample tubes (4) are formed on the cover (6) facing the heat-insulating shell (3) at intervals and partially inwardly recessed, and each assembly groove has two fixing plates (9) arranged horizontally and movably close to or away from each other, each fixing plate (9) has a hole extending horizontally through it and matching the positioning rod (8), and two positioning rods (8) are symmetrically and horizontally fixedly arranged on both sides of the tube mouth of the sample tube (4).

6. The heating device of the thermogravimetric analyzer according to claim 5, characterized in that: The fixing assembly further comprises: a guide rod (7) and a tension spring (10); wherein: A guide rod (7) is horizontally fixedly arranged in each of the assembly grooves, and two fixing plates (9) are slidably arranged on each of the guide rods (7) at intervals, and tension springs (10) are respectively sleeved on both ends of the guide rod (7), and both ends of each of the tension springs (10) are respectively fixedly arranged on the fixing plate (9) and the assembly groove.

7. The heating device of the thermogravimetric analyzer according to claim 1, characterized in that: At least two pairs of handles are fixedly arranged at intervals on the upper end of the cover body (6).

8. The heating device of the thermogravimetric analyzer according to claim 1, characterized in that: An exhaust pipe connected to the interior of the heat-insulating shell (3) is vertically penetrated through the cover body (6), and an air injection pipe connected to the interior of the heat-insulating shell (3) is horizontally penetrated through the side wall of the heat-insulating shell (3).

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