A sample introduction device for a thermogravimetric analyzer

Abstract

This utility model discloses a sample introduction device for a thermogravimetric analyzer, relating to the field of thermogravimetric analyzer sample introduction technology. It includes a thermogravimetric analyzer base, a heating furnace fixedly mounted on the upper end of the base, a placement stage fixedly mounted on the upper end of the base and on the right side of the base, and a drive assembly fixedly mounted on the upper end of the base and behind the heating furnace and placement stage. The drive assembly consists of a linear module, a longitudinal drive cylinder, a guide bracket, and an L-shaped moving plate. By setting the placement stage and the drive assembly (comprising a linear module, a longitudinal drive cylinder, a guide bracket, and an L-shaped moving plate) on the upper end of the thermogravimetric analyzer base, and by setting a clamping assembly (comprising a clamping cylinder, a clamping arm, a connecting plate, and a clamping plate) on the drive assembly, the sample introduction process can be automated, eliminating the need for manual movement of the crucible into the heating furnace.

Description

Technical Field

[0001] This utility model relates to the field of sample introduction technology for thermogravimetric analyzers, and in particular to a sample introduction device for thermogravimetric analyzers. Background Technology

[0002] A thermogravimetric analyzer (TGA) is a precision analytical instrument based on thermogravimetric methods. Its core function is to measure the relationship between the mass of a substance and temperature or time in real time under programmed temperature control, thereby analyzing the thermal stability, composition, decomposition kinetics, and other characteristics of the substance. It is widely used in materials science, chemical engineering, pharmaceutical research and development, environmental monitoring, and other fields. The sample introduction process is a crucial preliminary step in the analytical experiment. The sample to be tested (usually a powder, granular, or block sample) must be accurately placed into the instrument's heating furnace to ensure that the sample is in a stable and uniform thermal environment during subsequent heating, thus guaranteeing the accuracy and repeatability of the analytical data. Some traditional TGA analyzers rely on manual operation for sample introduction. Operators must carefully move the crucible containing the sample into the heating furnace using tools. The entire process requires strict control of the force and positional accuracy to avoid sample spillage, crucible collisions, or contamination. Furthermore, the sample can only be removed and placed after the heating furnace has cooled to a safe temperature. The operation is cumbersome and requires a high level of operator skill.

[0003] To achieve precise temperature control and create a stable thermal field, the heating furnace of a thermogravimetric analyzer is typically designed with a furnace chamber of a certain depth. This structural feature places higher demands on sample introduction operations. During manual sample introduction, due to the limited depth of the furnace chamber, operators cannot directly observe the placement of the crucible inside the furnace, which can easily lead to problems such as crucible misplacement or incomplete placement in the designated slot, resulting in uneven heating of the sample and affecting the reliability of the analytical results. Furthermore, the heating furnace remains at a high temperature after completing one analysis, and manual sample introduction requires waiting for the furnace chamber to cool down, which not only prolongs the experimental cycle and reduces the efficiency of instrument use but also poses a safety risk of burns to the operator. Therefore, this application proposes a sample introduction device for a thermogravimetric analyzer. Utility Model Content

[0004] The main objective of this invention is to provide a sample introduction device for a thermogravimetric analyzer, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A sample introduction device for a thermogravimetric analyzer includes a thermogravimetric analyzer base. A heating furnace is fixedly mounted on the upper end of the thermogravimetric analyzer base. A placement stage is fixedly mounted on the upper end of the thermogravimetric analyzer base and on the right side of the base. A drive assembly is fixedly mounted on the upper end of the thermogravimetric analyzer base and behind the heating furnace and placement stage. The drive assembly consists of a linear module, a longitudinal drive cylinder, a guide bracket, and an L-shaped moving plate. The longitudinal drive cylinder and the guide bracket are both fixedly mounted on the upper end of a slide on the linear module. The longitudinal drive cylinder is located behind the guide bracket. The L-shaped moving plate is fixedly installed on the upper end of the piston rod of the longitudinal drive cylinder. The L-shaped moving plate passes forward through the guide bracket. A clamping assembly is fixedly installed at the front end of the L-shaped moving plate. The clamping assembly consists of a clamping cylinder, clamping arms, connecting plates, and clamping plates. There are two clamping arms, both of which are installed on the clamping cylinder. There are two connecting plates, each fixedly installed on one of the two clamping arms. There are two clamping plates, each fixedly installed at the lower end of one of the two connecting plates.

[0006] Preferably, the placement platform is fixedly installed on the upper end of the thermogravimetric analyzer base by bolts, and the upper end of the placement platform is evenly provided with a plurality of placement slots.

[0007] Preferably, the drive assembly is fixedly mounted on the upper end of the thermogravimetric analyzer base by bolts, and the longitudinal drive cylinder and the guide bracket are both fixedly mounted on the upper end of the slide table on the linear module by bolts. The guide bracket is provided with a guide rail groove, which runs through the guide bracket from front to back.

[0008] Preferably, the L-shaped moving plate on the drive assembly is slidably mounted in the guide rail groove opened on the guide bracket.

[0009] Preferably, the clamping assembly is located in front of the guide bracket, the clamping cylinder on the clamping assembly is fixedly installed on the front end of the L-shaped moving plate by bolts, the clamping plate is located below the clamping cylinder, and the inner end of the clamping plate is evenly provided with a number of arc-shaped grooves.

[0010] Compared with the prior art, the present invention has the following beneficial effects: By installing a placement platform and a drive assembly consisting of a linear module, a longitudinal drive cylinder, a guide bracket, and an L-shaped moving plate at the upper end of the thermogravimetric analyzer base, and installing a clamping assembly consisting of a clamping cylinder, a clamping arm, a connecting plate, and a clamping plate on the drive assembly, the sample injection process can be automated. This eliminates the need for manual movement of the crucible into the heating furnace, effectively avoiding problems such as crucible placement misalignment and uneven sample heating caused by furnace depth limitations during manual operation, thus ensuring the reliability of the analytical results. Furthermore, automated sample injection eliminates the need to wait for the heating furnace to cool to a safe temperature before sample loading and unloading, significantly shortening the experimental cycle, improving instrument efficiency, and eliminating the safety risk of burns to operators. During sample injection, the crucible containing the sample is placed in the placement slot at the upper end of the placement platform. The drive assembly then moves the clamping assembly, causing the two clamping plates to move to the sides of the crucible. The clamping assembly then clamps the crucible, and finally, driven by the drive assembly, the crucible is placed into the heating furnace. The clamping assembly then releases the crucible to the designated position. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram showing the positional relationship between the thermogravimetric analyzer base, heating furnace, and placement platform of this utility model. Figure 3 This is a schematic diagram showing the positional relationship between the driving component and the clamping component of this utility model; Figure 4 This is a schematic diagram of the clamping assembly of this utility model.

[0012] In the figure: 1. Thermogravimetric analyzer base; 2. Heating furnace; 3. Placement stage; 4. Drive assembly; 5. Clamping assembly; 6. Placement slot; 7. Linear module; 8. Longitudinal drive cylinder; 9. Guide bracket; 10. Guide rail slot; 11. L-shaped moving plate; 12. Clamping cylinder; 13. Clamping arm; 14. Connecting plate; 15. Clamping plate; 16. Arc-shaped slot. Detailed Implementation

[0013] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0014] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, a sample introduction device for a thermogravimetric analyzer includes a thermogravimetric analyzer base 1. A heating furnace 2 is fixedly installed on the upper end of the thermogravimetric analyzer base 1. A placement stage 3 is fixedly installed on the upper end of the thermogravimetric analyzer base 1 and on its right side. A drive assembly 4 is fixedly installed on the upper end of the thermogravimetric analyzer base 1 and behind the heating furnace 2 and the placement stage 3. The drive assembly 4 consists of a linear module 7, a longitudinal drive cylinder 8, a guide bracket 9, and an L-shaped moving plate 11. The longitudinal drive cylinder 8 and the guide bracket 9 are both fixedly installed on the upper end of the slide table on the linear module 7. The longitudinal drive cylinder 8 is located behind the guide bracket 9. An L-shaped moving plate 11 is fixedly installed on the upper end of the piston rod of the longitudinal drive cylinder 8. The L-shaped moving plate 11 simultaneously passes forward through the guide bracket 9. A clamping assembly 5 is fixedly installed at the front end of the L-shaped moving plate 11. The clamping assembly 5 consists of a clamping cylinder 12, clamping arms 13, connecting plates 14, and clamping plates 15. There are two clamping arms 13, both mounted on the clamping cylinder 12. There are two connecting plates 14, each fixedly mounted on one of the two clamping arms 13. There are two clamping plates 15, each fixedly mounted on one of the two connecting plates 12. At the lower end of 4, a placement platform 3 and a drive assembly 4 consisting of a linear module 7, a longitudinal drive cylinder 8, a guide bracket 9, and an L-shaped moving plate 11 are set at the upper end of the thermogravimetric analyzer base 1. A clamping assembly 5 consisting of a clamping cylinder 12, a clamping arm 13, a connecting plate 14, and a clamping plate 15 is set on the drive assembly 4. This enables automated operation of the sample injection process, eliminating the need for manual movement of the crucible into the heating furnace 2. This effectively avoids problems such as crucible placement misalignment and uneven sample heating caused by furnace depth limitations during manual operation, ensuring the reliability of the analytical results. Simultaneously, Automated sample loading eliminates the need to wait for the heating furnace 2 to cool down to a safe temperature before sample loading and unloading, significantly shortening the experimental cycle, improving instrument efficiency, and eliminating the safety risk of operators being burned by high temperatures. During sample loading, the crucible containing the sample is placed into the placement slot 6 at the top of the placement stage 3. Then, the drive assembly 4 drives the clamping assembly 5 to move, causing the two clamping plates 15 to move to both sides of the crucible. The clamping assembly 5 then clamps the crucible, and finally, driven by the drive assembly 4, the crucible is placed into the heating furnace 2. Then, the clamping assembly 5 releases the crucible to the designated position.

[0015] Specifically, the placement platform 3 is bolted to the upper end of the thermogravimetric analyzer base 1. Several placement slots 6 are evenly distributed on the upper end of the placement platform 3. The drive assembly 4 is bolted to the upper end of the thermogravimetric analyzer base 1. The longitudinal drive cylinder 8 and the guide bracket 9 are both bolted to the upper end of the slide table on the linear module 7. The guide bracket 9 has a guide rail groove 10 that runs through it from front to back. The L-shaped moving plate 11 on the drive assembly 4 slides vertically within the guide rail groove 10 on the guide bracket 9. The clamping assembly 5 is located in front of the guide bracket 9, and the clamping cylinder on the clamping assembly 5... The clamping cylinder 12 is fixedly installed at the front end of the L-shaped moving plate 11 by bolts. The clamping plate 15 is located below the clamping cylinder 12. Several arc-shaped grooves 16 are evenly opened on the inner end of the clamping plate 15. When using this thermogravimetric analyzer, the crucible containing the sample to be tested needs to be placed into the placement groove 6 opened at the upper end of the placement stage 3. After the sample preparation is completed, the drive assembly 4 is started. The linear module 7 in the drive assembly 4 drives its slide to move laterally until the guide bracket 9 at the upper end of the slide and the longitudinal drive cylinder 8 move to the rear of the target crucible. At this time, the clamping assembly 5 is directly above the target crucible. Then the longitudinal drive cylinder 8 is started, and its piston rod retracts downward. The L-shaped moving plate 11 slides downward along the guide rail groove 10 on the guide bracket 9, and the clamping assembly 5 fixed at the front end of the L-shaped moving plate 11 moves downward accordingly. When the two clamping plates 15 in the clamping assembly 5 are respectively located on both sides of the target crucible, the clamping cylinder 12 drives the two clamping arms 13 to move relative to each other. The clamping arms 13 drive the two clamping plates 15 to move closer to each other through the connecting plate 14, and use the arc groove 16 at the inner end of the clamping plate 15 to stably clamp the crucible. Then, the piston rod of the longitudinal drive cylinder 8 extends, driving the L-shaped moving plate 11, the clamping assembly 5 and the clamped crucible to move upward along the guide rail groove 10 to a safe height. After that, the linear module 7... The slide table is moved laterally again to transport the crucible to the top of the heating furnace 2. Then, the longitudinal drive cylinder 8 retracts again to move the L-shaped moving plate 11 downward, sending the crucible into the designated position inside the heating furnace 2. Finally, the clamping cylinder 12 drives the clamping arm 13 to move in the opposite direction, causing the two clamping plates 15 to release the crucible, completing the crucible placement. Then, the piston rod of the longitudinal drive cylinder 8 extends to move the L-shaped moving plate 11 and the clamping assembly 5 upward to reset. The linear module 7 drives the slide table back to the initial position, and the heating furnace 2 can be started for subsequent thermogravimetric analysis experiments. After one experiment is completed, the above operation can be repeated to inject and analyze the next crucible.

[0016] Specifically, the curvature of the arc groove 16 must match the curvature of the outer wall of the crucible to ensure stable clamping; the outer diameter of the two clamping plates 15 when clamping the crucible must be smaller than the inner diameter of the heating furnace 2 to ensure that the clamping assembly 5 can smoothly send the crucible into and out of the heating furnace 2 and avoid interference.

[0017] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A sample feeding device for a thermal gravimetric analyzer, comprising a thermal gravimetric analyzer base (1), a heating furnace (2) is fixedly installed at the upper end of the thermal gravimetric analyzer base (1), characterized in that: A platform (3) is fixedly installed on the upper end of the thermogravimetric analyzer base (1) and on the right side of the thermogravimetric analyzer base (1). A drive assembly (4) is fixedly installed on the upper end of the thermogravimetric analyzer base (1) and behind the heating furnace (2) and the platform (3). The drive assembly (4) consists of a linear module (7), a longitudinal drive cylinder (8), a guide bracket (9), and an L-shaped moving plate (11). The longitudinal drive cylinder (8) and the guide bracket (9) are both fixedly installed on the upper end of the slide table on the linear module (7), and the longitudinal drive cylinder (8) is located behind the guide bracket (9). The L-shaped moving plate (11) is fixedly installed on the upper end of the slide table on the linear module (7). The L-shaped moving plate (11) is fixedly installed at the upper end of the piston rod of the longitudinal drive cylinder (8). The L-shaped moving plate (11) passes forward through the guide bracket (9). The front end of the L-shaped moving plate (11) is fixedly installed with a clamping assembly (5). The clamping assembly (5) consists of a clamping cylinder (12), a clamping arm (13), a connecting plate (14), and a clamping plate (15). There are two clamping arms (13) and both are installed on the clamping cylinder (12). There are two connecting plates (14) and they are fixedly installed on the two clamping arms (13) respectively. There are two clamping plates (15) and they are fixedly installed on the lower ends of the two connecting plates (14) respectively.

2. The sample introduction device for a thermogravimetric analyzer according to claim 1, characterized in that: The placement platform (3) is fixedly installed on the upper end of the thermogravimetric analyzer base (1) by bolts, and a number of placement slots (6) are evenly opened on the upper end of the placement platform (3).

3. The sample introduction device for a thermogravimetric analyzer according to claim 2, characterized in that: The drive assembly (4) is fixedly installed on the upper end of the thermogravimetric analyzer base (1) by bolts. The longitudinal drive cylinder (8) and the guide bracket (9) are both fixedly installed on the upper end of the slide table on the linear module (7) by bolts. The guide bracket (9) is provided with a guide rail groove (10), which passes through the guide bracket (9) from front to back.

4. The sample introduction device for a thermogravimetric analyzer according to claim 3, characterized in that: The L-shaped moving plate (11) on the drive assembly (4) is slidably mounted up and down in the guide rail groove (10) opened on the guide bracket (9).

5. A sample introduction device for a thermogravimetric analyzer according to claim 4, characterized in that: The clamping assembly (5) is located in front of the guide bracket (9). The clamping cylinder (12) on the clamping assembly (5) is fixedly installed at the front end of the L-shaped moving plate (11) by bolts. The clamping plate (15) is located below the clamping cylinder (12). The inner end of the clamping plate (15) is evenly provided with several arc-shaped grooves (16).

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