Constant weight instrument

Abstract

The utility model relates to a constant weight instrument which comprises a supporting main body, a heating chamber, a cooling chamber, a heat insulation door, a first driving part, a transfer device and a sampling claw, the heating chamber and the cooling chamber are both arranged on the supporting main body, a heating device and a sample supporting disc are arranged in the heating chamber, and a weighing device is arranged in the cooling chamber; a transfer channel is arranged between the cooling chamber and the heating chamber, and the first driving part is used for driving the heat insulation door to open or close the transfer channel, so that the heating chamber and the cooling chamber are communicated or isolated; the transfer device is arranged on the supporting main body and extends into the cooling chamber, and the sampling claw is connected with the transfer device; the transfer device is used for driving the sampling claw to move so as to drive the sampling claw to transfer a sample between the heating chamber and the cooling chamber through the transfer channel. Therefore, the whole constant weight measurement process of heating, cooling, weighing and the like of the sample is ensured to be carried out in a closed environment, the temperature of the weighing device can be prevented from being too high, and the accuracy of the weighing device is improved.

Description

Technical Field

[0001] The present application relates to the technical field of online weighing equipment, and in particular to a constant weighing instrument. Background Art

[0002] Constant weight instruments generally need to be equipped with heating devices and weighing devices (such as balances). When a constant weight instrument is used to weigh a sample, a heating device is required to heat the sample, and then the sample is weighed using a weighing device after it cools down to room temperature. In order to ensure the environmental requirements of the sample, the entire constant weight weighing process, including heating, cooling, and weighing, is carried out in a closed chamber.

[0003] Therefore, when the constant weight instrument in the prior art performs constant weight weighing on a sample, the heating device and the weighing device are located in a closed chamber, and the temperature of the weighing device is too high due to heat conduction, which affects the accuracy of weighing. Utility Model Content

[0004] Based on this, it is necessary to provide a constant weight instrument to address the problem that when the constant weight instrument in the prior art performs constant weight weighing on the sample, the heating device and the weighing device are located in a closed chamber, and the temperature of the weighing device is too high due to heat conduction, which affects the accuracy of weighing.

[0005] A constant weight instrument, comprising: a supporting body, a heating chamber, a cooling chamber, a heat insulation door, a first driving member, a transfer device and a sampling claw;

[0006] The heating chamber and the cooling chamber are both arranged on the supporting body, a heating device and a sample supporting plate are arranged in the heating chamber, and a weighing device is arranged in the cooling chamber;

[0007] A transfer passage is provided between the cooling chamber and the heating chamber, and the first driving member is used to drive the heat-insulating door to open or close the transfer passage so that the heating chamber is connected to or isolated from the cooling chamber;

[0008] The transfer device is arranged on the supporting body and extends into the cooling chamber, and the sampling claw is connected to the transfer device; the transfer device is used to drive the sampling claw to move, so as to drive the sampling claw to transfer samples between the heating chamber and the cooling chamber through the transfer channel.

[0009] In one embodiment, the heating chamber and the cooling chamber have a common side wall, and the transfer channel is disposed on the common side wall.

[0010] In one embodiment, a partition wall is provided in the cooling chamber, and the partition wall divides the cooling chamber into a weighing chamber and a cooling chamber, and the cooling chamber is located between the weighing chamber and the heating chamber, and a cooling device and a sample cooling plate are provided in the cooling chamber;

[0011] A connecting port is provided on the partition wall; a partition door and a second driving member are provided in the cooling chamber, and the second driving member is used to drive the partition door to open or close the connecting port so that the weighing chamber is connected to or isolated from the cooling chamber.

[0012] In one embodiment, a lofting door is provided on the top wall of the cooling cavity, and the lofting door can open or close the cooling cavity.

[0013] In one embodiment, the constant weight instrument further comprises:

[0014] a first auxiliary solvent filling system, wherein a filling pipe of the first auxiliary solvent filling system is connected to the interior of the cooling chamber and is used to fill the auxiliary solvent into the sample crucible on the sample cooling plate; and / or,

[0015] The first protective gas filling system is communicated with the interior of the weighing chamber and is used to fill the weighing chamber with protective gas.

[0016] In one embodiment, the constant weight instrument further comprises:

[0017] a second auxiliary solvent filling system, wherein a filling pipe of the second auxiliary solvent filling system is connected to the interior of the heating chamber and is used to fill the auxiliary solvent into the sample crucible on the sample support plate; and / or,

[0018] A second protective gas filling system, wherein a filling pipe of the second protective gas filling system is connected to the interior of the heating chamber and is used for filling the heating chamber with protective gas.

[0019] In one embodiment, the constant weight instrument further comprises an exhaust gas treatment and neutralization device, which is connected to the interior of the heating chamber so that the gas inside the heating chamber can enter the exhaust gas treatment and neutralization device and be discharged after being neutralized and purified by the exhaust gas treatment and neutralization device.

[0020] In one embodiment, the constant weight instrument further includes a transmission shaft and a sample driving assembly, wherein the sample driving assembly is disposed on the supporting body and outside the heating chamber, one end of the transmission shaft is connected to the sample driving assembly, and the other end extends into the heating chamber and is connected to the sample supporting plate; the sample driving assembly is used to drive the transmission shaft to rotate, thereby driving the sample supporting plate to rotate around its own axis.

[0021] In one embodiment, the sample driving assembly is used to drive the transmission shaft to perform lifting motion along its own length direction.

[0022] In one embodiment, the heating chamber comprises a heat-insulating furnace body and a heat-insulating furnace cover, and the heat-insulating furnace cover is used to open or close the heat-insulating furnace body.

[0023] When the above-mentioned constant weight instrument performs constant weight measurement, during the heating process of the sample, the transfer channel can be closed by the heat-insulating door, thereby isolating the heating chamber from the cooling chamber, thereby preventing the temperature of the weighing device from being too high. When the sample needs to be weighed, the transfer channel can be opened through the heat-insulating door, and the sample can be transferred to the cooling chamber through the transfer device and the sampling claw, and the transfer channel can be closed in time, so that during the cooling and weighing of the sample, the heating chamber can also be isolated from the cooling chamber to prevent the temperature of the weighing device from being too high. In this way, not only is it ensured that the entire constant weight measurement process of sample heating, cooling, weighing, etc. is carried out in a closed environment, but it can also prevent the temperature of the weighing device from being too high, thereby improving the accuracy of the weighing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the structure of a constant weight instrument according to an embodiment.

[0025] Description of reference numerals: 100, supporting body;

[0026] 200, heating chamber; 210, sample support plate; 211, sample crucible; 220, transfer channel; 230, common side wall; 201, heat-insulating furnace body; 202, heat-insulating furnace cover;

[0027] 300, cooling chamber; 310, weighing device; 311, balance body; 312, balance tray; 320, partition wall; 321, weighing chamber; 322, cooling chamber; 323, partition door; 3221, sample cooling tray; 3222, cooling device; 3223, sample placement door;

[0028] 400. Thermal insulation door;

[0029] 500, transfer device; 510, sampling claw;

[0030] 611, first auxiliary solvent filling system; 612, second auxiliary solvent filling system; 621, first protective gas filling system; 622, second protective gas filling system; 630, tail gas treatment and neutralization device;

[0031] 710, transmission shaft; 720, sample drive assembly. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0033] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0038] Please refer to Figure 1 An embodiment of the present application provides a constant weight instrument, which includes: a supporting body 100, a heating chamber 200, a cooling chamber 300, an insulating door 400, a first driving member (not shown), a transfer device 500 and a sampling claw 510.

[0039] The heating chamber 200 and the cooling chamber 300 are both disposed on the supporting body 100. A heating device (not shown) and a sample support plate 210 are disposed in the heating chamber 200, and a weighing device 310 is disposed in the cooling chamber 300. The heating device may be an electric heating wire disposed in the sample support plate 210, or may be other electric heating structures disposed outside the sample support plate 210.

[0040] A transfer passage 220 is provided between the cooling chamber 300 and the heating chamber 200. The first driving member is used to drive the heat insulation door 400 to open or close the transfer passage 220 so that the heating chamber 200 is connected to or isolated from the cooling chamber 300.

[0041] The transfer device 500 is disposed on the support body 100 and extends into the cooling chamber 300, and the sampling claw 510 is connected to the transfer device 500. The transfer device 500 is used to drive the sampling claw 510 to move, so as to drive the sampling claw 510 to transfer the sample between the heating chamber 200 and the cooling chamber 300 through the transfer channel 220.

[0042] The transfer device 500 may include a transfer drive and a transfer transmission assembly, and one end of the transfer device 500 connected to the sampling claw 510 extends into the cooling chamber 300. The transfer drive is, for example, a motor, etc., which is used to drive the transfer transmission assembly to move, and the transfer transmission assembly drives the sampling claw 510 to move.

[0043] When the sample is weighed at a constant weight, the sample can be placed in the sample crucible 211, and the sample crucible 211 is placed on the sample support plate 210. The first driving member drives the heat insulation door 400 to close to ensure the airtightness of the heating chamber 200, so that the sample in the sample crucible 211 can be heated by the heating device in a closed environment. After the sample is heated, the heat insulation door 400 can be driven to open by the first driving member, thereby opening the transfer channel 220. The transfer device 500 drives the sampling claw 510 to move, so that the sampling claw 510 extends into the heating chamber 200 through the transfer channel 220 to grab the sample crucible 211, and then the sample crucible 211 is transferred from the transfer channel 220 to the weighing device 310 in the cooling chamber 300, and the heat insulation door 400 is closed in time. After the sample in the sample crucible 211 is cooled in the cooling chamber 300, the cooled sample can be weighed by the weighing device 310.

[0044] It can be seen that when the constant weight instrument of the embodiment of the present application weighs the sample at a constant weight, during the heating process of the sample, the transfer channel 220 can be closed by the heat-insulating door 400, thereby isolating the heating chamber 200 from the cooling chamber 300, thereby preventing the weighing device 310 from being too hot. When the sample needs to be weighed, the transfer channel 220 can be opened by the heat-insulating door 400, and the sample can be transferred to the cooling chamber 300 by the transfer device 500 and the sampling claw 510, and the transfer channel 220 can be closed in time, so that in the process of cooling and weighing the sample, the heating chamber 200 can also be isolated from the cooling chamber 300 to prevent the weighing device 310 from being too hot. In this way, it is not only ensured that the entire constant weight measurement process of the sample, such as heating, cooling, and weighing, is carried out in a closed environment, but also that the temperature of the weighing device 310 can be prevented from being too high, thereby improving the accuracy of the weighing device 310.

[0045] The first driving member can drive the heat insulation door 400 to translate, so as to open or close the transfer channel 220. The first driving member is, for example, an electric push rod or other driving members. The weighing device 310 can include a balance body 311 and a balance tray 312.

[0046] like Figure 1 As shown, in one embodiment, the heating chamber 200 and the cooling chamber 300 have a common side wall 230. The transfer channel 220 is disposed on the common side wall 230. The transfer channel 220 may be a through hole opened on the side wall 230.

[0047] Optionally, the transfer device 500 drives the sampling claw 510 to perform a translational motion along the through direction of the transfer channel 220 . Therefore, the height of the weighing device 310 and the height of the sample support plate 210 need to be adapted to the height of the transfer channel 220 .

[0048] like Figure 1As shown, in one embodiment, the heating chamber 200 includes a heat-insulating furnace body 201 and a heat-insulating furnace cover 202. The heat-insulating furnace cover 202 is used to open or close the heat-insulating furnace body 201. The heat-insulating furnace cover 202 can be connected to the heat-insulating furnace body 201 by a rotational connection, and the heat-insulating furnace cover 202 rotates relative to the heat-insulating furnace body 201, so as to open or close the heat-insulating furnace body 201. Before heating the sample, the heat-insulating furnace body 201 is opened through the heat-insulating furnace cover 202, and a sample crucible 211 containing the sample can be placed on the sample support plate 210 in the heat-insulating furnace body 201 (i.e., the heating chamber 200).

[0049] Specifically, the common side wall 230 may be a side wall of the heat-insulating furnace body 201 .

[0050] like Figure 1 As shown, in one embodiment, a partition wall 320 is provided in the cooling chamber 300, and the partition wall 320 divides the cooling chamber 300 into a weighing chamber 321 and a cooling chamber 322. The cooling chamber 322 is located between the weighing chamber 321 and the heating chamber 200. A cooling device 3222 and a sample cooling plate 3221 are provided in the cooling chamber 322. The sample cooling plate 3221 is used to support the sample crucible 211. The sample cooling plate 3221 can be placed on the cooling device 3222, so that the sample crucible 211 on the sample cooling plate 3221 can be cooled by the cooling device 3222.

[0051] A communication port (not shown) is provided on the partition wall 320. A partition door 323 and a second driving member are provided in the cooling chamber 300. The second driving member is used to drive the partition door 323 to open or close the communication port so that the weighing chamber 321 is connected to or isolated from the cooling chamber 322.

[0052] The partition door 323 may be connected to the top wall of the cooling chamber 300, or may be connected to the partition wall 320. The second driving member may be a motor, etc. The second driving member may drive the partition door 323 to rotate, and the partition door 323 opens or closes the communication port by rotating.

[0053] Since the cooling chamber 322 is located between the weighing chamber 321 and the heating chamber 200, after the sample is heated, the heat-insulating door 400 is driven to open the transfer channel 220, and the transfer device 500 can be used to drive the sampling claw 510 to move, and the sample crucible 211 is first transferred to the sample cooling plate 3221 in the cooling chamber 322, and the heat-insulating door 400 is closed in time, and the partition door 323 is kept closed to isolate the weighing chamber 321 from the cooling chamber 322. In this way, the sample in the sample crucible 211 can be enclosed in the cooling chamber 322 for cooling.

[0054] After the cooling device 3222 in the cooling chamber 322 cools down the sample in the sample crucible 211 on the sample cooling plate 3221, the partition door 323 can be driven by the second driving member to open the connecting port, and the sampling claw 510 can be driven to move by the transfer device 500 to transfer the sample crucible 211 to the weighing chamber 321 through the connecting port, and the cooled sample can be weighed by the weighing device 310.

[0055] It can be seen that in this embodiment, after the sample is heated, the sample can be first transferred to the cooling chamber 322 for cooling, and then transferred to the weighing chamber 321 for weighing. Compared with the traditional method of natural cooling of samples, the setting of the cooling chamber 322 in this embodiment can make the sample cool quickly after heating, so as to be weighed in time, saving constant weight measurement time. Moreover, through the partition door 323 that can be opened or closed, the sample can be cooled in the closed cooling chamber 322, which is conducive to quickly cooling the sample. Moreover, the cooling chamber 322 is located between the weighing chamber 321 and the heating chamber 200, which can further isolate the weighing device 310 from the heating chamber 200, which is more conducive to preventing the weighing device 310 from being heated and causing the temperature to be too high.

[0056] Please refer to Figure 1 In one embodiment, a lofting door 3223 is provided on the top wall of the cooling cavity 322 , and the lofting door 3223 can open or close the cooling cavity 322 .

[0057] During constant weight measurement, when the sample in the heating chamber 200 is heated, the sample placing door 3223 can be opened to add a sample crucible 211 containing the sample to the sample cooling disk 3221 in the cooling chamber 322. Then close the placing door 3223 to close the cooling chamber 322. Then drive the heat insulation door 400 to open through the first driving member, drive the partition door 323 to open through the second driving member, and drive the sampling claw 510 to move through the transfer device 500, so that the sampling claw 510 places the sample crucible 211 added on the sample cooling disk 3221 on the sample support disk 210 in the heating chamber 200. After retracting the sampling claw 510, drive the heat insulation door 400 to close through the first driving member, and drive the partition door 323 to close through the second driving member. At this time, the number of sample crucibles 211 in the heating chamber 200 has been increased, and heating can continue. Through this embodiment, the number of sample crucibles 211 can be increased in the middle of constant weight measurement.

[0058] In one embodiment, the constant weight instrument further includes an air cooling device (not shown). The air cooling device is in communication with the cooling chamber 322 and is used to continuously introduce dry cooling gas into the cooling chamber 322. On the one hand, it can form an air block when the transfer channel 220 is opened to block the influx of high-temperature air in the heating chamber 200, and at the same time, it can also cool the sample crucible 211 in the cooling chamber 322.

[0059] Some experiments require the addition of auxiliary solvents, such as sulfuric acid, acetic acid, etc., to assist the ashing process of the sample. Please refer to Figure 1 In one embodiment, the constant weight instrument further includes a first auxiliary solvent filling system 611. The filling pipe of the first auxiliary solvent filling system 611 is connected to the interior of the cooling cavity 322 and is used to fill the auxiliary solvent into the sample crucible 211 on the sample cooling plate 3221.

[0060] Specifically, the output end of the filling pipe of the first auxiliary solvent filling system 611 may be placed toward the sample crucible 211 on the sample cooling plate 3221 , so that the auxiliary solvent may be filled into the sample crucible 211 through the first auxiliary solvent filling system 611 .

[0061] Please refer to Figure 1 In one embodiment, the constant weighing instrument further includes a first protective gas filling system 621, which is connected to the interior of the weighing chamber 321 and is used to fill the weighing chamber 321 with protective gas, thereby providing a protective gas environment for the sample in the weighing chamber 321.

[0062] Please refer to Figure 1 In one embodiment, the constant weight instrument further includes a second auxiliary solvent filling system 612 , a filling pipe of which is connected to the interior of the heating chamber 200 and is used to fill the auxiliary solvent into the sample crucible 211 on the sample support plate 210 .

[0063] Specifically, the output end of the filling pipe of the second auxiliary solvent filling system 612 may be placed toward the sample crucible 211 on the sample cooling plate 3221 , so that the auxiliary solvent may be filled into the sample crucible 211 through the second auxiliary solvent filling system 612 .

[0064] Please refer to Figure 1 In one embodiment, the constant weight instrument also includes a second protective gas filling system 622, the filling pipe of the second protective gas filling system 622 is connected to the interior of the heating chamber 200, and is used to fill the protective gas into the heating chamber 200, thereby providing a protective gas environment for the sample in the heating chamber 200.

[0065] Please refer to Figure 1 In one embodiment, the constant weight instrument also includes an exhaust gas treatment and neutralization device 630, which is connected to the interior of the heating chamber 200 so that the gas inside the heating chamber 200 can enter the exhaust gas treatment and neutralization device 630 and be discharged after being neutralized and purified by the exhaust gas treatment and neutralization device 630.

[0066] Please refer to Figure 1In one embodiment, the constant weight instrument further includes a transmission shaft 710 and a sample driving assembly 720. The sample driving assembly 720 is disposed on the supporting body 100 and outside the heating chamber 200. One end of the transmission shaft 710 is connected to the sample driving assembly 720, and the other end extends into the heating chamber 200 and is connected to the sample supporting disk 210. The sample driving assembly 720 is used to drive the transmission shaft 710 to rotate, so as to drive the sample supporting disk 210 to rotate around its own axis. The sample driving assembly 720 is, for example, a motor.

[0067] The transmission shaft 710 is driven to rotate by the sample driving assembly 720 to drive the sample support plate 210 to rotate around its own axis, so that the position of the sample crucible 211 on the sample support plate 210 can be adjusted, and the sample crucible 211 to be transferred can be rotated to a position close to the transfer channel 220 to facilitate sampling by the sampling claw 510.

[0068] Furthermore, by adjusting the position of the sample crucible 211 on the sample support plate 210 , the sample crucible 211 on the sample support plate 210 can be conveniently aligned with the filling pipe of the second auxiliary solvent filling system 612 , thereby facilitating the filling of the auxiliary solvent into the sample crucible 211 .

[0069] In one embodiment, the sample drive assembly 720 is used to drive the transmission shaft 710 to perform lifting and lowering motion along its own length direction, so as to adjust the height of the sample crucible 211 on the sample support plate 210 so that the height of the sample crucible 211 is adapted to the height of the transfer channel 220, thereby facilitating sampling by the sampling claw 510.

[0070] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A constant weight instrument, characterized in that: The constant weight instrument comprises: a supporting body, a heating chamber, a cooling chamber, a heat insulation door, a first driving member, a transfer device and a sampling claw; The heating chamber and the cooling chamber are both arranged on the supporting body, a heating device and a sample supporting plate are arranged in the heating chamber, and a weighing device is arranged in the cooling chamber; A transfer passage is provided between the cooling chamber and the heating chamber, and the first driving member is used to drive the heat-insulating door to open or close the transfer passage so that the heating chamber is connected to or isolated from the cooling chamber; The transfer device is arranged on the supporting body and extends into the cooling chamber, and the sampling claw is connected to the transfer device; the transfer device is used to drive the sampling claw to move, so as to drive the sampling claw to transfer samples between the heating chamber and the cooling chamber through the transfer channel.

2. The constant weight apparatus according to claim 1, characterized in that: The heating chamber and the cooling chamber have a common side wall, and the transfer channel is arranged on the common side wall.

3. The constant weight instrument according to claim 1, characterized in that: A partition wall is provided in the cooling chamber, and the partition wall divides the cooling chamber into a weighing chamber and a cooling chamber. The cooling chamber is located between the weighing chamber and the heating chamber, and a cooling device and a sample cooling plate are provided in the cooling chamber. A connecting port is provided on the partition wall; a partition door and a second driving member are provided in the cooling chamber, and the second driving member is used to drive the partition door to open or close the connecting port so that the weighing chamber is connected to or isolated from the cooling chamber.

4. The constant weight apparatus according to claim 3, characterized in that: The top wall of the cooling cavity is provided with a lofting door, and the lofting door can open or close the cooling cavity.

5. The constant weight apparatus according to claim 3, characterized in that: Also includes: a first auxiliary solvent filling system, wherein a filling pipe of the first auxiliary solvent filling system is connected to the interior of the cooling chamber and is used to fill the auxiliary solvent into the sample crucible on the sample cooling plate; and / or, The first protective gas filling system is communicated with the interior of the weighing chamber and is used to fill the weighing chamber with protective gas.

6. The constant weight apparatus according to claim 1, characterized in that: Also includes: a second auxiliary solvent filling system, wherein a filling pipe of the second auxiliary solvent filling system is connected to the interior of the heating chamber and is used to fill the auxiliary solvent into the sample crucible on the sample support plate; and / or, A second protective gas filling system, wherein a filling pipe of the second protective gas filling system is connected to the interior of the heating chamber and is used for filling the heating chamber with protective gas.

7. The constant weight apparatus according to claim 1, characterized in that: It also includes a tail gas treatment and neutralization device, which is connected to the interior of the heating chamber so that the gas inside the heating chamber can enter the tail gas treatment and neutralization device and be discharged after being neutralized and purified by the tail gas treatment and neutralization device.

8. The constant weight apparatus according to claim 1, characterized in that: It also includes a transmission shaft and a sample driving assembly, wherein the sample driving assembly is arranged on the supporting body and located outside the heating chamber, one end of the transmission shaft is connected to the sample driving assembly, and the other end extends into the heating chamber and is connected to the sample supporting plate; the sample driving assembly is used to drive the transmission shaft to rotate, so as to drive the sample supporting plate to rotate around its own axis.

9. The constant weight apparatus according to claim 8, characterized in that: The sample driving assembly is used to drive the transmission shaft to perform lifting motion along its own length direction.

10. The constant weight apparatus according to claim 1, characterized in that: The heating chamber comprises a heat-insulating furnace body and a heat-insulating furnace cover, and the heat-insulating furnace cover is used to open or close the heat-insulating furnace body.

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