CN114152540A - Wide-range thermogravimetric analysis device - Google Patents
Wide-range thermogravimetric analysis device Download PDFInfo
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- CN114152540A CN114152540A CN202111659481.3A CN202111659481A CN114152540A CN 114152540 A CN114152540 A CN 114152540A CN 202111659481 A CN202111659481 A CN 202111659481A CN 114152540 A CN114152540 A CN 114152540A
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- 238000002411 thermogravimetry Methods 0.000 title claims abstract description 53
- 238000010438 heat treatment Methods 0.000 claims abstract description 110
- 238000005303 weighing Methods 0.000 claims abstract description 60
- 239000000725 suspension Substances 0.000 claims abstract description 51
- 238000007789 sealing Methods 0.000 claims description 17
- 230000000149 penetrating effect Effects 0.000 claims description 8
- 230000035515 penetration Effects 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 26
- 238000005086 pumping Methods 0.000 description 14
- 238000010586 diagram Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 235000019505 tobacco product Nutrition 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G21/00—Details of weighing apparatus
- G01G21/02—Arrangements of bearings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G21/00—Details of weighing apparatus
- G01G21/23—Support or suspension of weighing platforms
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
- G01N5/045—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder for determining moisture content
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Abstract
The invention discloses a wide-range thermogravimetric analysis device, and belongs to the technical field of thermogravimetric analysis. The wide-range thermogravimetric analysis device comprises: heating furnace; a weighing assembly, comprising: the balance supporting cylinder is positioned above the heating furnace; a scale supported by the scale support cylinder; the tray is positioned in the heating furnace and is used for containing the articles to be weighed; the upper end of the suspension wire is connected with the lower end part of the balance, and the lower end of the suspension wire penetrates through the balance supporting cylinder and is connected with the tray; and the control and acquisition system is electrically connected with the weighing component and the heating furnace respectively, and controls the weighing process of the weighing component and the heating process of the heating furnace. According to the invention, the balance supporting barrel supports the high-range balance, the high-range function of thermogravimetric analysis is realized, and the balance trays are connected through the specific suspension wires, so that the weighing stability and accuracy are enhanced.
Description
Technical Field
The invention relates to the technical field of thermogravimetric analysis, in particular to a wide-range thermogravimetric analysis device.
Background
In the prior art, many related researches on inorganic matters and organic matters require thermogravimetric analysis technology, for example, the moisture content in tobacco products is determined by using a thermogravimetric method.
The existing thermogravimetric analysis instrument mainly comprises a balance, a heating furnace, a program temperature control system, an atmosphere control system, a real-time recording and collecting system and the like. The balance is used for measuring mass, mass signals are converted into current signals through the sensor to be output, and the current signals are recorded in real time to obtain mass changes of the sample in the test process. The sample is heated in the heating furnace, the heating process is controlled by the program temperature control system, and the temperature control program is executed by the thermocouple.
At present, the arrangement modes of a heating furnace and a balance are mainly divided into three types, namely a top-loading type, a suspension type and a parallel type. Wherein, the maximum sample amount tested by the existing typical thermogravimetric analysis device, such as a microcomputer differential thermal instrument, is 300mg, and the maximum sample amount tested by the corrosion-resistant online thermogravimetric reactor is 200 mg. It can be seen that most thermogravimetric instruments are mainly used for small test piece samples, the mass is in the order of mg, the measuring range is narrow, more than 30g of samples cannot be measured, and the thermogravimetric analysis of large test pieces cannot be met.
Disclosure of Invention
The invention provides a wide-range thermogravimetric analysis device, aiming at the technical problems that the existing thermogravimetric analysis instrument is narrow in range and cannot meet the thermogravimetric analysis of a large test piece in the prior art.
In one aspect of the present invention, a wide-range thermogravimetric analysis apparatus includes:
heating furnace;
a weighing assembly, comprising:
a balance support cylinder located above the heating furnace;
a scale supported by the scale support cylinder;
the tray is positioned in the heating furnace and is used for containing the articles to be weighed; and
the upper end of the suspension wire is connected with the lower end part of the balance, and the lower end of the suspension wire penetrates through the balance supporting cylinder and is connected with the tray;
and the control and acquisition system is electrically connected with the weighing assembly and the heating furnace, is used for acquiring the weighing value of the weighing assembly and the heating temperature of the heating furnace in real time, and controls the weighing assembly and the heating furnace.
Further, the balance comprises:
the weighing module is arranged in the balance supporting cylinder, receives a weighing instruction of the control and acquisition system, weighs the article in real time, and feeds back real-time weight information of the article to the control and acquisition system;
and the display screen is separated from the weighing module and is used for displaying the weight information.
Further, the diameter range of the suspension wire is 2.5mm +/-0.2 mm, the length range of the suspension wire is 100cm +/-10 cm, and the lower end of the suspension wire is fixedly connected with the tray.
Further, still include:
and the vibration buffer part is arranged between the balance supporting cylinder and the heating furnace and is used for realizing flexible connection between the balance supporting cylinder and the heating furnace.
Further, still include:
and the thermocouple is arranged in the balance supporting cylinder and used for monitoring the temperature in the balance supporting cylinder, the thermocouple transmits the acquired signal to the control and acquisition system, and the control and acquisition system controls the heating temperature of the heating furnace according to the acquired signal.
Further, the balance support cylinder further includes:
and the plurality of penetrating pieces are hermetically mounted on the outer wall of the balance supporting cylinder and used for allowing power lines, signal lines and/or thermocouples to penetrate and be mounted.
Further, the penetration piece is hermetically mounted on the outer wall of the balance support cylinder through a sealing assembly, and the sealing assembly comprises:
the rubber plug is provided with a through hole along the axial direction, and the through hole is used for installing the penetrating piece;
the ring flange that two intervals set up, two the ring flange is located respectively the both sides of rubber buffer, and will from both sides the rubber buffer presss from both sides tightly, two all set up threaded hole on the ring flange, two adopt bolt-up to connect between the ring flange, and one of them the ring flange with the outer wall sealing fixed connection of supporting cylinder.
Further, the heating furnace includes:
a plurality of heating couples, an
And the multi-loop program temperature controller controls the plurality of heating couples to heat the heating furnace according to the heating instruction of the control and acquisition system.
The heating couples are arranged at the bottom of the heating furnace along a circumferential direction array.
Further, still include:
and the vacuumizing system is used for vacuumizing the heating furnace and the supporting cylinder according to a vacuumizing instruction sent by the control and acquisition system.
Further, the vacuum pumping system comprises a rotary vane vacuum pump and a mechanical pump, the rotary vane vacuum pump and the mechanical pump perform graded vacuum pumping, the use range of the rotary vane vacuum pump is more than 600pa, and the use range of the mechanical pump is within 600 pa.
The invention has the beneficial effects that: according to the invention, the balance supporting barrel supports the high-range balance, the high-range function of thermogravimetric analysis is realized, and the balance trays are connected through the specific suspension wires, so that the weighing stability and accuracy are enhanced.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Like reference numerals refer to like parts throughout the drawings. In that
In the figure:
FIG. 1 is a schematic diagram of the structure of one embodiment of a wide-range thermogravimetric analysis apparatus of the present invention;
FIG. 2 is a schematic view of another embodiment of a wide-range thermogravimetric analysis apparatus of the present invention;
FIG. 3 is a schematic view of a seal for a through-penetration;
fig. 4 is a real diagram of a balance support cylinder of the wide-range thermogravimetric analysis device of the invention.
Reference numerals: 101-balance, 102-suspension wire, 103-tray, 104-balance supporting cylinder, 105-heating furnace, 106-control and acquisition system, 107-penetrating piece, 108-vibration buffer part, 109-partition plate, 110-rubber plug, 111-flange plate, 112-threaded hole, 113-vacuum pumping system, 1131-rotary vane vacuum pump, 1132-mechanical pump, 1051-heating furnace body, 1052-heat exchanger, 1053-fan and 1054-heater furnace door.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a product or apparatus that comprises a list of steps or elements is not necessarily limited to those elements explicitly listed, but may include other elements not expressly listed or inherent to such product or apparatus.
In the prior art, many related researches on inorganic matters and organic matters require thermogravimetric analysis technology, such as determination of moisture content in tobacco products by using a thermogravimetric method. However, most of the conventional thermogravimetric analysis devices are used for thermogravimetric analysis of a small sample, and the test range for performing the thermogravimetric analysis is narrow and is mostly in the milligram level. When thermogravimetric analysis of a large sample, for example hundreds of grams, is required, the analysis requirements are not met. If the analysis is carried out for many times, larger manpower and material resources are consumed. In order to solve the technical problems, the invention provides a wide-range thermogravimetric analysis device.
FIG. 1 shows a schematic structural diagram of one embodiment of a wide-range thermogravimetric analysis apparatus of the present invention.
As shown in fig. 1, the wide-range thermogravimetric analysis apparatus of the present invention includes: the device comprises a weighing assembly, a heating furnace 105 and a control and acquisition system 106, wherein the weighing assembly comprises a balance 101, a suspension wire 102, a tray 103 and a balance supporting cylinder 104, wherein the balance 101 is fixed in the balance supporting cylinder 104, the lower end of the balance supporting cylinder 104 is connected with the heating furnace 105, and the balance 101 is supported by the balance supporting cylinder 104; the upper end of the suspension wire 102 is connected with the lower end of the balance 101, the lower end of the suspension wire 102 penetrates through the balance supporting cylinder 104 and is connected with the tray 103 in the heating furnace 105, and the balance 101 is connected with the tray 103 through the suspension wire 102 to weigh the articles in the tray 103. The control and acquisition system 106 is connected with the weighing assembly and the heating furnace 105 respectively, and controls the weighing process of the weighing assembly and the heating process of the heating furnace 105. In this embodiment, the balance support cylinder 104 is connected to the heating furnace 105, wherein the balance support cylinder 104 is used for supporting and fixing the balance 101, so that when a large-scale day with a large measurement range is used, the balance support cylinder 104 can be used for supporting and fixing, and a wide measurement range of the thermogravimetric analysis process is realized. In the measuring assembly, the balance 101 is connected with the tray 109 through a suspension wire, wherein the upper end of the suspension wire 102 is connected with the lower end of the balance 101, the lower end of the suspension wire 102 penetrates through the balance supporting cylinder 104 and is connected with the tray 109 in the heating furnace, and the balance 101 is connected with the tray 109 through the suspension wire 102 to weigh the articles in the tray 109. The weighing component and the heating furnace 105 are connected through the control and acquisition system 106, the weighing process and the heating process are automatically controlled, and weighing information of the articles and heating information of the heating furnace 105 are received in real time, so that subsequent processing is facilitated. The balance 101 is supported therein by a metal spacer 109 in the balance support cylinder 104. Wherein a small hole is left in the middle of the partition 109, and the suspension wire 102 is connected with the tray through the small hole.
Optionally, the balance 101 comprises: the weighing module is arranged in the balance supporting cylinder 104, receives a weighing instruction of the control and acquisition system 106, weighs the article in real time, and feeds back real-time weight information of the article to the control and acquisition system 106; and the display screen is separated from the weighing module and is used for displaying the real-time weight information.
In this alternative embodiment, the balance 101 includes a weighing module and a display screen. Wherein, the weighing module is used for weighing the articles in the tray 103; the display screen is used for displaying related article weighing information. The weighing module is arranged in a balance supporting cylinder 104, is connected with a tray 103 in a heating furnace 105 through a suspension wire 103, and is used for weighing the weight of an article subjected to thermogravimetric analysis in the tray 103 in real time. The display device is arranged outside the wide-range thermogravimetric analysis device and used for displaying the weighing information of the weighing module, so that the monitoring and the operation of the weighing process of the working personnel are facilitated. The efficient execution of the weighing process is guaranteed, the weighing abnormity which occurs is timely processed, and accidents are avoided.
Optionally, the lower end of the balance 101 further comprises: a hook connected to the upper end of the suspension wire 102.
Optionally, the diameter of the suspension wire 102 is within a preset diameter range, the length of the suspension wire 102 is within a preset length range, and the lower end of the suspension wire 102 is fixedly connected with the tray 103.
In this alternative embodiment, a suspension wire 102 is used to connect the balance 101 and the tray 103 on which the items are placed. Therefore, if the suspension wire 102 is too short, the distance between the balance 101 and the heating furnace 105 may be too short, which may affect the weighing process of the balance 101. The suspension wire 102 is too thin, which results in poor weighing stability, and at this time, the suspension wire 102 is likely to shake, which results in weighing inaccuracy. Too thick a suspension wire 102 causes the weight of the suspension wire 102 to increase, reducing the range of the balance to some extent. Therefore, the selection of the suspension wire 102 needs to satisfy a certain preset diameter range and a preset length range to ensure the stability and accuracy of the weighing process. In addition, since the suspension wires 102 are placed in the heating furnace, the suspension wires 102 also satisfy the requirement of high temperature resistance. In addition, in order to reduce the shaking and enhance the weighing stability, the lower end of the suspension wire 102 is fixedly connected with the tray 103. The fixed connection mode of the screw rod and the nut can be selected as the fixed connection mode of the fixed connection. Through the connection mode of the threaded screw, the suspension wire 102 or the tray 103 can be conveniently detached and replaced in the follow-up process, and meanwhile, the stability is high.
Specifically, according to the weighing experience, in the selection of the suspension wire 102, the suspension wire 102 satisfies the preset diameter range of 2.5mm ± 0.2mm, and the suspension wire satisfies the preset length range of 100cm ± 10 cm.
Preferably, the length of the suspension wire 102 is 1m, the diameter of the suspension wire 102 is 2.5mm, and the suspension wire 102 is a thin welding wire with high rigidity.
FIG. 2 shows a schematic diagram of one example of a wide-range thermogravimetric analysis apparatus of the present invention.
Optionally, as shown in fig. 2, the wide-range thermogravimetric analysis apparatus is further characterized by comprising: and a vibration damping part 108 provided between the balance support cylinder 104 and the heating furnace 105.
In this alternative embodiment, a vibration buffer 108 is provided between the heating furnace 105 and the balance support cylinder 104 to prevent the stability of the balance support cylinder 104 from being affected by the vibration of the heating furnace 105, and thus the accuracy of the weighing process.
Optionally, the vibration damper 108 has flexibility.
Specifically, the connection portion of the balance support cylinder 104 and the heating furnace 105 may be a flexible bellows. The bellows through the flexible connection can slow down the vibration that heating furnace 105 produced, and the vibration that avoids the heating furnace to produce passes to balance supporting cylinder 104, and then influences weighing of balance 101, and stability and the accuracy of the weighing process cause the influence.
Specifically, the balance support cylinder 104 is connected to the heating furnace 105 in a penetrating manner, and the balance support cylinder 104 needs to satisfy high temperature resistance and also satisfy a certain sealing requirement. In the specific structural design of the balance support cylinder 104, the balance support cylinder 104 is made of a high-temperature-resistant stainless steel material and is designed to satisfy a cylinder structure with a certain cylinder diameter and a certain height, wherein the balance 101 is fixed in the balance support cylinder 104. To meet the sealing requirements, the top end of the balance support cylinder 104 may be sealed by an integral large flange. In addition, in order to facilitate observation of the state of the balance 101, an observation window may be provided on the front surface of the balance support cylinder 104 to facilitate observation of the state of the balance 101.
Optionally, the wide-range thermogravimetric analysis device further includes: and a thermocouple provided in the balance support cylinder 104 to monitor the temperature in the balance support cylinder 104.
The inside of the balance support cylinder 104 is in communication with the inside of the heating furnace 105, and the balance 101 is located in the balance support cylinder 104 but is also affected by the temperature of the heating furnace 105. The thermocouple is arranged in the balance supporting cylinder 104, so that the temperature in the balance supporting cylinder 104 is monitored in real time, and the condition that the environment temperature of the balance 101 exceeds the range to influence the weighing accuracy of the balance is avoided.
Optionally, the balance support cylinder 104 includes: and a plurality of penetration pieces 107 provided on an outer wall of the balance support cylinder 104 for passing and installing power lines, signal lines and/or thermocouples and then sealing them.
As shown in fig. 2, the balance support cylinder 104 is provided on the outer wall thereof with a plurality of penetration pieces 107 for passing and mounting power supply lines, signal lines and/or thermocouples, wherein the penetration pieces are subjected to a sealing process.
The balance support cylinder 104 communicates with the heating furnace 105, and since the heating furnace 105 needs to be operated under a vacuum environment when heating is performed, sealing of the balance support cylinder 104 is important when the heating furnace 105 is evacuated. In addition, a plurality of penetration pieces 107 are further provided on the outer wall of the balance support cylinder 104, and the penetration pieces 107 are used for passing and mounting power supply lines, signal lines, and/or thermocouples, so that a sealing process is required for mounting the penetration pieces 107.
The penetrating piece 107 is installed through seal assembly seal on the outer wall of balance supporting cylinder 104, seal assembly 104 includes rubber buffer 110 and two ring flanges 111 that the interval set up, rubber buffer 110 is formed with the through-hole along the axial for the installation penetrating piece 107. Two the ring flange 111 is located respectively the both sides of rubber buffer 110, and will from both sides the rubber buffer 110 presss from both sides tightly, two threaded hole 112 has all been seted up on the ring flange 111, two adopt bolt-up connection between the ring flange 111, and one of them the ring flange 111 with the outer wall fixed connection of balance supporting cylinder 104, preferably welded connection.
In particular, FIG. 3 shows a schematic view of the seal to the through-penetration 107. As shown in fig. 3, a hole is drilled in the axial direction of the trapezoidal rubber plug 110, the aperture is slightly larger than the outer diameter of a power line or a signal line which needs to pass through, a power line passes through the rubber plug 110, the rubber plug 110 is arranged between two flange plates 111, the two flange plates 111 can compress the rubber plug 110 through bolt connection, and the rubber plug 110 compresses the power line, so that the sealing between the power line and the rubber plug is realized, and the sealing of the penetrating piece 107 is realized. In addition, the sealing performance is further enhanced by coating vacuum grease, vacuum mud and the like. After sealing, in order to ensure the sealing performance of the whole device, the sealing performance of the whole device needs to be verified, and during verification, the pressure in the tested ultimate vacuum is smaller than a certain pressure threshold, wherein the pressure threshold can be reasonably set according to different equipment requirements and vacuum requirements, for example, the pressure threshold can be set to be 0.5 Pa.
Optionally, the heating furnace includes: the heating system comprises a plurality of heating couples and a multi-loop program temperature controller arranged in the control and acquisition system, wherein the multi-loop program temperature controller controls the plurality of heating couples to heat the heating furnace according to a heating instruction of the control and acquisition system 106.
In this optional embodiment, when the heating furnace 105 is heated, the multi-loop program temperature controller controls the plurality of heating couples to heat the heating furnace, so as to ensure that the temperature in the heating furnace 105 has good uniformity, thereby ensuring the accuracy of the analysis process when performing thermogravimetric analysis on the articles in the tray 103 in the heating furnace 105. By providing a plurality of heating couples, wherein the plurality of heating couples are uniformly arranged in the heating furnace 105, uniform heating of the heating furnace 105 is realized. Meanwhile, the heating efficiency is also improved by arranging the heating couples. For example, when three heating couples are provided, the three heating couples may be arranged 120 degrees apart each to achieve uniform heating of the furnace.
Optionally, the wide-range thermogravimetric analysis device of the present invention further includes: and a vacuum-pumping system 113 for performing vacuum-pumping on the heating furnace 105 according to the vacuum-pumping command issued by the control and acquisition system 106.
In this alternative embodiment, the vacuum pumping system 113 is connected to the control and acquisition system 106, and the heating furnace 105 is pumped according to a vacuum pumping command sent by the control and acquisition system 106, and the vacuum pumping system 113 includes a rotary vane vacuum pump 1131 and a mechanical pump 1132. In the process of vacuumizing the charging furnace 105, the heating furnace 105 is vacuumized according to a vacuumizing instruction sent by the control and acquisition system 106 through the cooperation of the vacuumizing system 113 and the control and acquisition system 106. The vacuum pumping system 113 includes a rotary vane pump 1131 and a mechanical pump 1132. The matching of the rotary-vane vacuum pump 1131 and the mechanical pump 1132 enables the vacuum pumping process to be performed efficiently.
Preferably, rotary vane vacuum pump 1131 and mechanical pump 1132 operate between the subregion, use rotary vane vacuum pump 1131 more than vacuum pressure 600pa, use mechanical pump 1132 within vacuum pressure 600pa, and this mode can guarantee that the device internal pressure reaches below 0.5pa in the short time for evacuation process efficiency. Through the use of the multi-stage vacuum pumps, the corresponding vacuum pumps are respectively used in different pressure intervals for carrying out the vacuum pumping process, so that the high-efficiency execution of the vacuum pumping process is realized.
The wide-range thermogravimetric analysis device can also be provided with a standing stand for operation and maintenance of related equipment. The balance support barrel uses a separate stand to support and is completely separated from a standing stand, so that the balance 101 is prevented from being influenced by vibration caused by walking of a person on the stand.
Fig. 4 is a schematic structural diagram showing an example of the wide-range thermogravimetric analysis apparatus of the present invention.
The weighing process and the structural features of the wide-range thermogravimetric analysis apparatus of the present invention will be described in detail below with reference to fig. 4. As shown in fig. 4, the heating furnace further includes a heating furnace body 1051, a heat exchanger 1052, a blower 1053 and an oven door 1054, wherein the heat exchanger 1052 is provided with a tray 103 for performing a thermal weighing process of the articles. The control and acquisition system 106 is respectively connected with the experimental balance 101 and the heat exchanger 1052 and is used for acquiring the weighing signal of the balance 101, the temperature of the balance 101 and the vacuumizing information and monitoring in real time; and issues a weighing and heating command to control the weighing process of the balance 101 and the heating process of the heat exchanger 1052, i.e., the heater. The strong cabinet is used for supplying power to the whole device. The experimental balance 101 is fixed by a balance supporting cylinder 104 in the middle of the heat exchanger 1052, the lower end of the experimental balance 101 is connected with a suspension wire 102, and the other end of the suspension wire 102 passes through the balance supporting cylinder 104 and is connected with a tray 103 in the center of the heat exchanger 1052. The length and diameter of the suspension wire 102 should satisfy certain conditions, for example, the suspension wire 102 is a thin welding wire with a length of 1 meter and a diameter of 25 mm. The stability of the whole device is guaranteed, the accuracy of the thermogravimetric analysis result is further guaranteed, meanwhile, the balance 101 is guaranteed to have a certain distance from the center of the heating furnace 105, and the influence of the high temperature of the heating furnace 105 on the balance 101 is avoided. A plurality of heating couples are selected for heating in the heat exchanger 1052, so that the heating process is rapid and uniform. The heat exchanger 1052 is connected to an evacuation system, wherein the evacuation system comprises a rotary-vane vacuum pump 1131 and a mechanical pump 1132, and is used for performing an evacuation operation on the heat exchanger 1051. The vacuum pumping process of the heat exchanger 1052 is rapidly and efficiently performed by the cooperation of the mechanical pump 1132 and the rotary vane vacuum pump 1131.
In addition, the wide-range thermogravimetric analysis device can replace the balance 101 according to the range requirements of thermogravimetric analysis of different samples, realize the expansion of the weighing range by replacing the balance, and further facilitate the thermogravimetric analysis of articles with larger samples.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A wide-range thermogravimetric analysis device, comprising:
heating furnace;
a weighing assembly, comprising:
a balance support cylinder located above the heating furnace;
a scale supported by the scale support cylinder;
the tray is positioned in the heating furnace and is used for containing the articles to be weighed; and
the upper end of the suspension wire is connected with the lower end part of the balance, and the lower end of the suspension wire penetrates through the balance supporting cylinder and is connected with the tray;
and the control and acquisition system is electrically connected with the weighing assembly and the heating furnace, is used for acquiring the weighing value of the weighing assembly and the heating temperature of the heating furnace in real time, and controls the weighing assembly and the heating furnace.
2. The wide-range thermogravimetric analysis device of claim 1, wherein the balance comprises:
the weighing module is arranged in the balance supporting cylinder, receives a weighing instruction of the control and acquisition system, weighs the article in real time, and feeds back real-time weight information of the article to the control and acquisition system;
and the display screen is separated from the weighing module and is used for displaying the weight information.
3. The wide-range thermogravimetric analysis device according to claim 1, wherein the diameter of the suspension wire is in the range of 2.5mm ± 0.2mm, the length of the suspension wire is in the range of 100cm ± 10cm, and the lower end of the suspension wire is fixedly connected with the tray.
4. The wide-range thermogravimetric analysis device of claim 1, further comprising:
and the vibration buffer part is arranged between the balance supporting cylinder and the heating furnace and is used for realizing flexible connection between the balance supporting cylinder and the heating furnace.
5. The wide-range thermogravimetric analysis device of claim 1, further comprising:
and the thermocouple is arranged in the balance supporting cylinder and used for monitoring the temperature in the balance supporting cylinder, the thermocouple transmits the acquired signal to the control and acquisition system, and the control and acquisition system controls the heating temperature of the heating furnace according to the acquired signal.
6. The wide-range thermogravimetric analysis device of claim 1, wherein the balance support cylinder further comprises:
and the plurality of penetrating pieces are hermetically mounted on the outer wall of the balance supporting cylinder and used for allowing power lines, signal lines and/or thermocouples to penetrate and be mounted.
7. The wide-range thermogravimetric analysis device of claim 6, wherein the penetration member is sealingly mounted on the outer wall of the balance support cylinder by a sealing assembly comprising:
the rubber plug is provided with a through hole along the axial direction, and the through hole is used for installing the penetrating piece;
the ring flange that two intervals set up, two the ring flange is located respectively the both sides of rubber buffer, and will from both sides the rubber buffer presss from both sides tightly, two all set up threaded hole on the ring flange, two adopt bolt-up to connect between the ring flange, and one of them the ring flange with the outer wall sealing fixed connection of supporting cylinder.
8. The wide-range thermogravimetric analysis device of claim 1, wherein the furnace comprises:
a plurality of heating couples, an
And the multi-loop program temperature controller controls the plurality of heating couples to heat the heating furnace according to the heating instruction of the control and acquisition system.
The heating couples are arranged at the bottom of the heating furnace along a circumferential direction array.
9. The wide-range thermogravimetric analysis device of claim 1, further comprising:
and the vacuumizing system is used for vacuumizing the heating furnace and the supporting cylinder according to a vacuumizing instruction sent by the control and acquisition system.
10. The wide-range thermogravimetric analysis device according to claim 9, wherein the evacuation system comprises a rotary vane vacuum pump and a mechanical pump, the rotary vane vacuum pump and the mechanical pump perform stage evacuation, the use range of the rotary vane vacuum pump is over 600pa, and the use range of the mechanical pump is within 600 pa.
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