A high-precision thermogravimetric analyzer with an upper dish thermobalance structure

Abstract

The present invention provides an upper dish type thermobalance structure of a high-precision thermogravimetric analyzer, comprising an outer shell, which comprises an outer shell body with one end open and the other end closed, and a connector fixed to the open end of the outer shell body, wherein an air inlet is provided on the outer shell; a support plate, which is placed in the outer shell and divides the inner space of the outer shell into two cavities, a gap is left between the two sides of the support plate and the side wall of the shell, and a guide portion is provided on one side of the support plate, the guide portion is conical, and the air inlet is directly opposite to the tip of the conical guide portion; a lever body, wherein the air inlet is connected to a cavity in the outer shell, and the lever body is placed in another cavity. The present invention adopts a method of dividing the inner space of the outer shell by the support plate, and at the same time, respectively arranging the lever body and the air inlet in two cavities to prevent the gas flow from affecting the lever.

Description

Technical Field

[0001] The invention belongs to the field of material detection, and in particular relates to an upper dish type thermobalance structure of a high-precision thermogravimetric analyzer. Background Art

[0002] In material testing equipment such as thermogravimetric analyzers, the high temperature in the equipment during the testing process can easily have an adverse effect on the internal structure of the instrument, accelerate the aging of the equipment, and reduce the service life of the equipment. Therefore, when using the equipment, it is necessary to fill the equipment with inert gas to protect the equipment.

[0003] In existing testing instruments, due to the precise internal structure of the instrument, some connection parts of the balance structure are often connected by two special slings. When inert gas is filled and airflow is generated, the accuracy of the balance part of the instrument is easily affected due to the characteristics of the gas flow. Summary of the invention

[0004] In view of this, the present invention aims to propose an upper dish type thermobalance structure of a high-precision thermogravimetric analyzer to reduce the influence of gas flow on the internal balance components when the thermogravimetric analyzer is filled with atmosphere, thereby improving.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A high-precision thermogravimetric analyzer upper dish type thermobalance structure, comprising

[0007] An outer shell cover comprises a shell cover body with one end open and the other end closed and a connector fixed to the open end of the shell cover body, wherein an air inlet is provided on the outer shell cover;

[0008] A support plate is placed in the outer shell and divides the inner space of the outer shell into two cavities. Gaps are left between the two sides of the support plate and the side walls of the shell body. A guide portion is provided on one side of the support plate. The guide portion is conical, and the air inlet faces the tip of the conical guide portion.

[0009] The lever body, the air inlet is communicated with a cavity in the outer shell, and the lever body is placed in another cavity.

[0010] Furthermore, the end of the lever extends to both sides with fork legs, a floating platform is placed between the two fork legs, the two sides of the floating platform are rotatably connected to the two fork legs respectively, a hanging rod is hung under the floating platform, a through hole is opened on the support plate, the hanging rod passes through the support plate through the through hole, a guide block is fixedly provided at the bottom of the through hole, and the guide block includes a guide portion facing the inside of the outer shell cover and a protective portion surrounding the circumference of the hanging rod.

[0011] Furthermore, the guide portion has a curved surface on one side close to the opening of the outer shell cover, and the top of the curved surface faces the support plate.

[0012] Furthermore, the two sides of the floating platform are rotatably connected to the fork legs respectively, the top is connected to a crucible, and a counterweight hammer is fixedly arranged under the floating platform, so that the floating platform is in a horizontal state.

[0013] Furthermore, a connecting hole is provided on the counterweight, and a connecting pin is provided on the top end of the hanging rod, and the connecting pin is inserted into the connecting hole.

[0014] Furthermore, the floating platform extends a connecting rod downward, and the counterweight hammer is fixed to the bottom end of the connecting rod.

[0015] Furthermore, a support plate extends vertically upward from the upper surface of the floating platform, and the crucible is fixed on the top of the support rod.

[0016] Furthermore, the connector is annular, the floating platform is placed in the central hole of the connector, and two opposite through holes are opened on the side wall of the connector, and the support rod and the hanging rod pass through the two through holes and are placed outside.

[0017] Furthermore, it also includes two overflow plates, which are placed at the bottom of the support plate and fixed on both sides of the support plate, and a gap is left between the overflow plate and the outer shell cover, and the air inlet is placed between the two overflow plates.

[0018] Compared with the prior art, the upper dish type thermobalance structure of a high-precision thermogravimetric analyzer described in the present invention has the following advantages:

[0019] The present invention adopts a method of dividing the inner space of the outer shell by a support plate, and at the same time, the lever body and the air inlet are respectively arranged in two cavities to prevent the gas flow from affecting the lever;

[0020] A guide block is set on the support plate to prevent the gas from affecting the hanging rod during flow;

[0021] Two overflow plates are used so that when a protective gas with a lighter molecular weight is used, the gas first fills the space between the two overflow plates and then floats into the other cavity, so that the outer shell is gradually filled with the protective gas, preventing the gas from flowing too fast and affecting the lever body. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 It is the overall structure diagram of the thermogravimetric analyzer;

[0024] Figure 2It is a schematic diagram of the coordination structure of the support plate and the hanging rod;

[0025] Figure 3 It is a schematic diagram of the shell body structure;

[0026] Figure 4 This is a schematic diagram of the balance connection structure;

[0027] Figure 5 It is a schematic diagram of the structure of the end of the lever body;

[0028] Figure 6 This is a schematic diagram of the floating platform structure.

[0029] Description of reference numerals:

[0030] 1-shell cover; 11-shell cover body; 111-air inlet; 12-connector; 2-support plate; 21-overflow plate; 22-flow guide; 23-flow guide block; 231-flow guide; 232-protection part; 3-lever body; 31-fork foot; 311-positioning groove; 4-floating platform; 42-counterweight hammer; 421-connecting hole; 43-connecting rod; 44-positioning column; 5-weight plate; 51-hanging rod; 511-notch; 512-connecting pin; 6-crucible; 61-support rod. DETAILED DESCRIPTION

[0031] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0034] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0035] The upper dish type thermobalance structure of the high-precision thermogravimetric analyzer of the present invention comprises an outer shell cover 1, which comprises an outer shell cover body 11 with an opening at one end and a closed end at the other end and a connector 12 fixedly arranged at the open end of the outer shell cover body 11, and the outer shell cover body 11 is made of a transparent material, and an air inlet 111 is opened on the outer shell cover. Specifically, the outer shell cover 1 can be sealed by arranging a sealing ring between the edge of the outer shell cover body 11 and the connector 12, and the connector and the outer shell cover body are connected together through the outer shell of the thermogravimetric analyzer, which is a prior art and will not be described in detail here;

[0036] The support plate 2 is placed in the outer shell cover 1, and divides the internal space of the outer shell cover 1 into two cavities, and the two cavities are distributed up and down, and a gap is left between the two sides of the support plate 2 and the side walls of the shell cover body 11, and a guide portion 22 is provided on the surface of one side of the support plate 2, and the guide portion 22 is placed in the lower cavity. The guide portion 22 is conical, and the air inlet 111 is directly opposite to the tip of the conical guide portion 22. When the air inlet 111 fills the outer shell cavity with gas, the gas first contacts the guide portion 22, and then gradually diffuses into the internal space of the shell cover body 11 through the conical guide portion 22, and enters the upper cavity through the gap between the support plate and the outer shell cover 1. Two overflow plates 21 are respectively placed at the bottom of the support plate 2, and the overflow plates 21 are fixed on both sides of the support plate 2, and a gap is left between the overflow plate 21 and the outer shell cover 1, and the air inlet is placed between the two overflow plates 21.

[0037] The lever body 3, the air inlet 111 is connected to a cavity in the outer shell cover 1, and the lever body 3 is placed in another cavity, that is, the lever body 3 is placed in the upper space of the outer shell cover, one end of the lever body 3 is connected to the photosensitive element, and the other end extends to both sides with fork legs 31, leaving a space between the two fork legs 31, and a floating platform 4 is placed between the two fork legs 31, and the two sides of the floating platform 4 are rotatably connected to the two fork legs 31 respectively. Specifically, the two sides of the floating platform 4 are respectively provided with cut surfaces, the ends of the fork legs 31 are parallel to each other, and positioning grooves 311 are provided on the fork legs 31. The two cut surfaces respectively extend positioning columns 44 outwardly, and the positioning columns can be inserted into the positioning grooves 311. During the installation process, the floating platform 4 can be pre-placed between the two fork legs 31 by cooperating with the positioning columns 44 and the positioning grooves 311. Each fork leg 31 is provided with a through hole, and the positioning column 44 is provided with a blind hole. The pin shaft is inserted into the blind hole through the through hole, so that the floating platform 4 is rotatably connected to the fork legs 31.

[0038] A connecting rod 43 extends vertically downward from the middle of the lower surface of the floating platform 4. A counterweight 42 is fixedly arranged at the bottom of the connecting rod 43. The center of gravity of the counterweight 42 is on the same axis as the support rod, and the counterweight 42 is placed directly below the center of the floating platform 4. Due to the weight of the counterweight 42, when the end of the lever body 3 moves up and down, the floating platform 4 is in a horizontal state. A weight plate 5 is placed directly below the floating platform. A hanging rod 51 extends vertically upward from the middle of the weight plate 5. The hanging rod 51 is connected to the floating platform 4. Specifically, a connecting hole is provided on the counterweight 42, and a notch 511 is provided at the top of the hanging rod. The counterweight 42 is placed in the notch 511. A connecting pin 512 passes through the connecting hole and the groove wall of the notch 511, so that the counterweight 42 is hung on the hanging rod 51.

[0039] A through hole is opened on the support plate 2, and the hanging rod 51 passes through the support plate 2 through the through hole. A guide block 23 is fixedly provided at the bottom of the through hole. The guide block 23 includes a guide portion 231 facing the inside of the outer shell cover and a protective portion 232 surrounding the side of the hanging rod. When the gas flows toward the hanging rod 51, the gas first contacts the guide portion 231 end of the guide block 23, and then is diverted to the two sides of the hanging rod 51 to prevent the gas from affecting the hanging rod 51, causing the hanging rod 51 to shake, and affecting the horizontal posture of the floating platform 4.

[0040] The guide portion 22 is in an arc shape on one side close to the opening of the outer shell cover 1, and the top of the arc faces the direction of the support plate.

[0041] A support rod 61 extends vertically upward from the upper surface of the floating platform, and a crucible 6 is fixed on the top of the support rod.

[0042] The connector 12 is annular, the floating platform 4 is placed in the center hole of the connector 12, and two opposite through holes are opened on the side wall of the connector 12, and the support rod 61 and the hanging rod 51 pass through the two through holes and are placed outside.

[0043] In this embodiment, the protective gas is helium. During operation, the atmosphere controller is connected to the air inlet through the connecting nozzle to introduce the atmosphere into the outer shell cavity. Since the gas mass is relatively light, a large amount of helium is placed between the two overflow plates. When the helium reaches a certain amount, the helium flows out from under the overflow plate and floats to the upper cavity, so that the outer shell cover is gradually filled with helium to prevent the airflow from affecting the balance. At the same time, a guide portion is provided on the lower surface of the support plate. The guide portion is conical, and the tip of the cone is placed directly above the connecting nozzle until the outer shell cover is filled with helium.

[0044] Those skilled in the art should know that the lever body can rotate around its own middle part, and the weight at one end of the lever body close to the photosensitive element is constant. During the working process, the tester balances the two ends of the balance by placing a preset amount of test material in the crucible and weights in the weight plate. Later, during the testing process, as the ambient temperature of the crucible increases, the mass of the test material in the crucible changes, causing the balance body to tilt, and the photosensitive element moves with the end of the balance, causing the current in the thermogravimetric analyzer to change, thereby obtaining the thermogravimetric change of the mass of the material. Specifically, those skilled in the art should know how to obtain the thermogravimetric change of the material through the change of the current of the photosensitive element, which will not be repeated here.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-precision thermogravimetric analyzer upper dish thermobalance structure, Features: It comprises an outer shell, which comprises a shell body with one end open and the other end closed, and a connector fixed to the open end of the shell body, and an air inlet is opened on the outer shell; A support plate is placed in the outer shell and divides the inner space of the outer shell into two cavities. Gaps are left between the two sides of the support plate and the side walls of the shell body. A guide portion is provided on one side of the support plate. The guide portion is conical, and the air inlet faces the tip of the conical guide portion. The lever body, the air inlet is connected to a cavity in the outer shell, and the lever body is placed in another cavity; The end of the lever extends to both sides with forked legs, a floating platform is placed between the two forked legs, the two sides of the floating platform are rotatably connected to the two forked legs respectively, a hanging rod is hung under the floating platform, a through hole is opened on the support plate, the hanging rod passes through the support plate through the through hole, a guide block is fixed at the bottom of the through hole, and the guide block includes a guide portion facing the inside of the outer shell cover and a protective portion surrounding the circumference of the hanging rod; The two sides of the floating platform are rotatably connected to the fork legs respectively, a crucible is connected on the top, and a counterweight hammer is fixedly arranged under the floating platform to keep the floating platform in a horizontal state; A support rod extends vertically upward from the upper surface of the floating platform, and the crucible is fixed on the top of the support rod; The connecting head is annular, the floating platform is placed in the central hole of the connecting head, and two opposite through holes are opened on the side wall of the connecting head, and the support rod and the hanging rod are respectively passed through the two through holes and placed in the outside.

2. The upper dish type thermobalance structure of a high-precision thermogravimetric analyzer according to claim 1, Features: The side of the air guide portion close to the opening of the outer shell cover is an arc-shaped surface, and the arc top of the arc-shaped surface faces the direction of the supporting plate.

3. The upper dish type thermobalance structure of a high-precision thermogravimetric analyzer according to claim 1, Features: A connecting hole is provided on the counterweight hammer, and a connecting pin is provided on the top end of the hanging rod, and the connecting pin is inserted into the connecting hole.

4. The upper dish type thermobalance structure of a high-precision thermogravimetric analyzer according to claim 1, Features: A connecting rod is extended downward from the floating platform, and the counterweight hammer is fixed at the bottom end of the connecting rod.

5. The upper dish type thermobalance structure of a high-precision thermogravimetric analyzer according to claim 1, Features: It also includes two overflow plates, which are placed at the bottom of the support plate and fixed on both sides of the support plate, with a gap between the overflow plate and the outer shell cover, and the air inlet is placed between the two overflow plates.

Images