High-temperature molten salt measuring furnace

Abstract

The utility model relates to a high-temperature molten salt measuring furnace which comprises a measuring furnace body, a positioning frame, a cuvette tube and a flexible sleeve, and the measuring furnace body is provided with a molten salt cavity and an insertion hole located in the top and communicated with the molten salt cavity; the positioning frame is fixedly connected to the top of the measuring furnace main body, and the positioning frame is provided with a mounting channel vertically communicated with the molten salt cavity; the cuvette tube is arranged in the mounting channel in a penetrating manner so as to extend into the molten salt cavity; and the flexible sleeve is sleeved on the cuvette tube and is clamped in the mounting channel in an interference manner so as to fix the cuvette tube on the positioning frame. Therefore, the positioning frame is slightly deformed when heated during the operation of the whole high-temperature molten salt measuring furnace, dislocation between the cuvette tube and the temperature measuring channel is avoided, the measuring precision is improved, the positioning frame and the cuvette tube are stably connected and are not easy to shake, the flexible sleeve can absorb part of thermal deformation of the positioning frame, and the measuring accuracy is improved. Therefore, the cuvette tube is prevented from being crushed due to extrusion, and the measurement safety is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of high-temperature molten salt measurement, in particular to a high-temperature molten salt measurement furnace. Background Art

[0002] In the detection of high-temperature molten salt, the spectral analysis device has high requirements for the positioning accuracy of the cuvette tube. In order to ensure the positioning accuracy, the positioning bracket used to position the cuvette tube in the prior art is usually rigidly connected to the measuring furnace, which puts forward high requirements on the processing accuracy of the furnace body and the positioning bracket of the measuring furnace; and the high temperature generated when the measuring furnace is running will cause thermal deformation of the furnace body and the positioning bracket, which not only leads to reduced positioning accuracy, but also easily causes the furnace body and the positioning bracket to squeeze the cuvette tube. When the temperature is high, the cuvette tube will be crushed, causing measurement accidents. Utility Model Content

[0003] In view of the problems of high processing cost, insufficient measurement accuracy at high temperature and insufficient measurement safety in the existing high-temperature molten salt measuring furnace, it is necessary to provide a high-temperature molten salt measuring furnace.

[0004] A high-temperature molten salt measuring furnace, comprising:

[0005] A measuring furnace body, the measuring furnace body having a molten salt cavity and a socket located at the top and connected to the molten salt cavity;

[0006] A positioning frame, the positioning frame is fixedly connected to the top of the measuring furnace body, and the positioning frame has an installation channel vertically connected to the molten salt chamber;

[0007] A cuvette tube, the cuvette tube is sequentially inserted into the installation channel and the insertion hole to extend into the molten salt chamber; and

[0008] A flexible sleeve is sleeved on the cuvette tube and inserted into the installation channel, and the flexible sleeve is interference-engaged with the positioning frame to fix the cuvette tube on the positioning frame.

[0009] With such arrangement, the positioning frame is less deformed by heat during the operation of the entire high-temperature molten salt measuring furnace, and will not cause misalignment between the cuvette tube and the temperature measuring channel, thereby improving the measurement accuracy. The connection between the positioning frame and the cuvette tube is stable and not prone to shaking. The flexible sleeve can absorb part of the thermal deformation of the positioning frame, thereby preventing the cuvette tube from being squeezed and broken, thereby ensuring the safety of the measurement.

[0010] In one of the embodiments, the positioning frame further has a limiting step located in the installation channel, and the flexible sleeve abuts against the limiting step.

[0011] With such arrangement, the risk of the cuvette tube sliding down can be reduced due to the stopping of the limiting step, thereby improving the positioning accuracy.

[0012] In one embodiment, the inner diameter of the flexible sleeve in a natural state is 19.9 mm to 100.0 mm, and the outer diameter of the cuvette tube is 20 mm to 100.1 mm.

[0013] With such arrangement, the flexible sleeve and the cuvette tube are firmly connected and are not easy to loosen, and different combination models of the flexible sleeve and the cuvette tube can be configured according to different measurement requirements.

[0014] In one of the embodiments, the outer diameter of the flexible sleeve in a natural state is 30 mm to 100.1 mm, and the inner diameter of the positioning frame at the limiting step is 29.9 mm to 100 mm.

[0015] With such arrangement, the flexible sleeve can further lock the cuvette tube when it is interference-engaged at the limit step, thereby improving the tightness of the connection between the positioning frame, the flexible sleeve and the cuvette tube.

[0016] In one embodiment, the positioning frame comprises:

[0017] An upper mounting member, the upper mounting member comprising a limiting cylinder and a limiting step protruding from the inner wall of the limiting cylinder, the flexible sleeve is interference-engaged with the inner wall of the limiting cylinder and abuts against the limiting step, and the upper mounting member further comprises a plurality of adjustment holes penetrating the peripheral wall of the limiting cylinder in the axial direction;

[0018] a lower mounting member, the lower mounting member comprising a support ring fixedly connected to the top of the measuring furnace body and a plurality of adjustment columns extending from the support ring in a direction away from the measuring furnace body, the adjustment columns being inserted into the adjustment holes so that the lower mounting member and the upper mounting member surround and form the mounting channel; and

[0019] A plurality of adjusting members are movably and firmly connected to the adjusting column and abut against a side of the limiting cylinder facing the supporting ring.

[0020] With such arrangement, when the limiting cylinder, the flexible sleeve and the cuvette tube are interference-connected with each other, the height of the cuvette tube can be fine-tuned by adjusting the position of the adjusting member on the adjusting column, so there is no need to repeatedly adjust the position of the flexible sleeve on the cuvette tube, thereby facilitating assembly.

[0021] In one embodiment, the adjusting column has an external thread, and the adjusting member is an adjusting nut, which is threadedly connected to the adjusting column.

[0022] Such an arrangement facilitates fine adjustment and can also compensate for the inclination error that may exist when the flexible sleeve is clamped with the cuvette tube and the limiting cylinder.

[0023] In one embodiment, the limiting cylinder is provided with at least three adjusting holes, and the adjusting holes are evenly arranged circumferentially on the peripheral wall of the limiting cylinder.

[0024] Such an arrangement can prevent the cuvette tube from shaking on the positioning frame, thereby ensuring the stability of the high-temperature molten salt measuring furnace during operation.

[0025] In one embodiment, the limiting cylinder is provided with four adjusting holes, and the positions of the four adjusting holes correspond to the four side walls of the cuvette tube respectively.

[0026] With such an arrangement, the adjustment process of the cuvette tube is more intuitive, and debugging and assembly are convenient.

[0027] In one embodiment, the upper mounting member further comprises a limiting bracket fixedly connected to the limiting cylinder on the side facing the supporting ring, the limiting bracket is inserted into the molten salt chamber, and the limiting bracket has a limiting hole located in the molten salt chamber and matching the shape of the cuvette tube.

[0028] In this way, the limiting bracket limits the bottom of the cuvette tube, further reducing the shaking of the bottom of the cuvette tube, while also preventing the cuvette tube from touching the inner wall of the furnace, thereby protecting the cuvette tube.

[0029] In one embodiment, the adjusting column is integrally connected to the supporting ring.

[0030] With such an arrangement, the thermal deformation between the adjustment column and the support ring is synchronized, which can further reduce the influence of the thermal deformation on the cuvette tube.

[0031] In one embodiment, the limiting bracket is integrally connected to the limiting cylinder.

[0032] With such arrangement, cracks will not be generated at the connection between the limiting bracket and the limiting cylinder due to uneven thermal deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of the structure of a high-temperature molten salt measuring furnace in an embodiment of the present invention;

[0034] Figure 2 for Figure 1 A cross-sectional view of a high temperature molten salt measurement furnace is shown;

[0035] Figure 3 for Figure 2 A partial enlarged view of the high-temperature molten salt measuring furnace at the positioning frame is shown;

[0036] Figure 4A schematic diagram of the structure of a positioning frame in an embodiment of the utility model;

[0037] Figure 5 for Figure 4 Schematic diagram of the structure of the positioning frame and the cuvette tube shown.

[0038] Reference numerals:

[0039] 10. Measuring furnace body; 11. Furnace shell; 111. Mounting hole; 12. Furnace chamber; 121. Molten salt chamber; 122. Measuring channel; 123. Socket; 13. Insulation layer; 14. Insulation chamber; 20. Fiber optic channel flange; 30. Cuvette tube; 31. Round section; 32. Square section; 40. Positioning frame; 401. Mounting channel; 41. Upper mounting piece; 411. Limiting cylinder; 412. Limiting step; 413. Adjusting hole; 414. Limiting bracket; 4141. Limiting hole; 42. Lower mounting piece; 421. Support ring; 4211. First bolt hole; 422. Adjusting column; 43. Adjusting piece; 50. Flexible sleeve. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model 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 utility model. However, the utility model 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 utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0041] In the description of the present invention, 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 invention 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 invention.

[0042] 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 the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0043] In the present invention, 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 the present invention can be understood according to specific circumstances.

[0044] In the present utility model, 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" or "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" or "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.

[0045] 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.

[0046] In the detection of high-temperature molten salt, the spectral analysis device has high requirements for the positioning accuracy of the cuvette tube. In the prior art, a positioning bracket is arranged in the furnace cavity, and the positioning bracket has an outer cylinder and a positioning column welded in the outer cylinder and close to the bottom side of the outer cylinder. The length of the positioning column is determined by the height of the optical fiber channel. During installation, the positioning bracket is first inserted along the jack above the measuring furnace, and then the cuvette tube is inserted into the outer cylinder and abutted against the positioning column. In order to ensure a high positioning accuracy, the outer cylinder of the positioning bracket needs to fit with the inner cavity of the measuring furnace, that is, the furnace body, the positioning bracket and the cuvette tube are rigidly connected, which puts forward high requirements on the processing accuracy of the furnace body and the positioning bracket, which undoubtedly increases the production cost.

[0047] In addition, the high temperature generated during the operation of the furnace will cause thermal deformation of the furnace and the positioning bracket. The furnace and the positioning bracket inside the furnace are usually made of metal, while the cuvette tube is usually made of quartz. This leads to uneven thermal deformation of the three parts, especially the thermal expansion of the positioning column, which increases the height of the cuvette tube, affecting the measurement accuracy of the spectral analysis device. This thermal deformation will further cause the outer tube of the positioning bracket to squeeze the cuvette tube, which can easily break the cuvette tube in severe cases, thus affecting the measurement safety.

[0048] Based on this, it is necessary to provide a high-temperature molten salt measurement furnace with low processing cost, high safety and the ability to maintain high measurement accuracy at high temperatures.

[0049] See also Figure 1 , Figure 2 and Figure 5 , Figure 1 This is a schematic diagram of the structure of a high-temperature molten salt measuring furnace in an embodiment of the present utility model. Figure 2 for Figure 1 A cross-sectional view of a high-temperature molten salt measurement furnace is shown.

[0050] The high-temperature molten salt measuring furnace provided in the present application includes a measuring furnace body 10 , a cuvette tube 30 , an optical fiber channel flange 20 installed on the measuring furnace body 10 , and a positioning frame 40 installed on the top of the measuring furnace body 10 .

[0051] The measuring furnace body 10 includes a furnace shell 11 and a furnace chamber 12 and an insulation layer 13 arranged in the furnace shell 11. The insulation layer 13 is respectively abutted against the upper and lower ends of the furnace chamber 12. The furnace shell 11 is provided with two mounting holes 111 arranged symmetrically with respect to the center. A molten salt chamber 121 is provided in the furnace chamber 12. The high-temperature molten salt measuring furnace also has an insulation chamber 14 located between the furnace shell 11 and the furnace chamber 12 and surrounding the furnace chamber 12. The furnace chamber 12 is provided with two measuring channels 122 corresponding to the mounting holes 111, and the measuring channels 122 communicate with the molten salt chamber 121 and the insulation chamber 14. The optical fiber channel flange 20 is inserted into the furnace shell 11 from the mounting hole 111 and further inserted into the measuring channel 122. The two ends of the optical fiber channel flange 20 are respectively fixedly connected to the furnace shell 11 and abutted against the side wall of the furnace chamber 12 in the measuring channel 122. In this way, the setting of the optical fiber interface 211 on the high-temperature molten salt measuring furnace is completed, which is convenient for cooperation with the spectral analysis device.

[0052] The measuring furnace body 10 is provided with a jack located in the furnace shell 11 and a socket 123 located in the furnace chamber 12 in sequence from the top to the inside. The positioning frame 40 has a mounting channel 401 arranged vertically. The mounting channel 401, the jack, the socket 123 and the molten salt chamber 121 are connected in sequence for the cuvette tube 30 to be inserted.

[0053] The cuvette tube 30 includes a circular section 31 and a square section 32 connected to each other. Figure 5 As shown, Figure 5 for Figure 4 The schematic diagram of the structure of the positioning frame 40 and the cuvette tube 30 is shown. The cuvette tube 30 has an open end and a closed end. The open end is located at the circular section 31 and the closed end is located at the square section 32. The circular section 31 of the cuvette tube 30 cooperates with the flexible sleeve 50.

[0054] In order to solve the problem of insufficient installation of the cuvette tube 30 and the positioning accuracy of the cuvette tube 30 at high temperature in the prior art, the high-temperature molten salt measurement furnace provided by the present application also includes a flexible sleeve 50 .

[0055] The flexible sleeve 50 is sleeved on the cuvette tube 30 and inserted into the installation channel 401 . The flexible sleeve 50 is interference-engaged with the positioning frame 40 to fix the cuvette tube 30 on the positioning frame 40 , thereby fixing the cuvette tube 30 relative to the measurement furnace body 10 . Firstly, since the positioning frame 40 is completely arranged outside the molten salt chamber 121, the positioning frame 40 is less deformed by heat during the operation of the entire high-temperature molten salt measuring furnace, and will not cause misalignment between the cuvette tube 30 and the temperature measuring channel, thereby improving the measurement accuracy; secondly, a flexible sleeve 50 is added between the positioning frame 40 and the cuvette tube 30, so that the connection between the positioning frame 40 and the cuvette tube 30 is stable and not easy to shake; furthermore, during the long-term operation of the high-temperature molten salt measuring furnace, even if the temperature of the positioning frame 40 changes to a certain extent, resulting in a certain thermal deformation of the positioning frame 40 itself, the flexible sleeve 50 located between the positioning frame 40 and the cuvette tube 30 can also absorb this part of the thermal deformation, thereby preventing the cuvette tube 30 from being squeezed and broken, thereby ensuring the safety of the measurement.

[0056] For further information, see Figure 3 , Figure 3 for Figure 2 The shown is a partial enlarged view of the high-temperature molten salt measuring furnace at the positioning frame 40. In one embodiment of the utility model, the positioning frame 40 also has a limiting step 412 located in the installation channel 401, and the flexible sleeve 50 abuts against the limiting step 412, which can reduce the risk of the cuvette tube 30 sliding down and improve the positioning accuracy.

[0057] Optionally, in the above embodiment, the outer diameter of the cuvette tube 30 is 20 mm to 100.1 mm, and the inner diameter of the flexible sleeve 50 in a natural state is 19.9 mm to 100.0 mm, so that the flexible sleeve 50 and the cuvette tube 30 can be firmly fastened together, and different combination models of the flexible sleeve 50 and the cuvette tube 30 can be provided according to different measurement requirements.

[0058] Optionally, in the above embodiment, the outer diameter of the flexible sleeve 50 in a natural state is 30 mm to 100.1 mm, and the inner diameter of the positioning frame 40 at the limiting step 412 is 29.9 mm to 100 mm. In this way, when the flexible sleeve 50 is interference fit at the limiting step 412, it can further lock the cuvette tube 30, thereby improving the tightness of the connection between the positioning frame 40, the flexible sleeve 50 and the cuvette tube 30.

[0059] For details, please refer to Figure 4 and Figure 5 , Figure 4 for Figure 3 A schematic diagram of the structure of the middle positioning frame 40, Figure 5 for Figure 4 Schematic diagram of the structure of the positioning frame 40 and the cuvette tube 30. In an embodiment provided by the utility model, the positioning frame 40 includes an upper mounting member 41, a lower mounting member 42 and a plurality of adjusting members 43.

[0060] The upper mounting member 41 includes a limiting cylinder 411, a limiting step 412 protruding from the inner wall of the limiting cylinder 411, and a limiting bracket 414 fixedly connected to the limiting cylinder 411 on the side facing the support ring 421. The flexible sleeve 50 is interference-engaged with the inner wall of the limiting cylinder 411 and abuts against the limiting step 412. The limiting bracket 414 is inserted into the molten salt chamber 121. The limiting bracket 414 has a limiting hole 4141 located in the molten salt chamber 121 and matching the shape of the cuvette tube 30. The shape of the limiting hole 4141 is a square matching the square section 32 of the cuvette tube 30. In addition, the upper mounting member 41 also has a plurality of adjustment holes 413 that axially penetrate the peripheral wall of the limiting cylinder 411.

[0061] The lower mounting member 42 includes a support ring 421 and an adjustment column 422. The support ring 421 is fixedly connected to the top of the measuring furnace body 10. The adjustment column 422 extends from the side of the support ring 421 away from the measuring furnace body 10 in a direction away from the measuring furnace body 10. The adjustment column 422 is inserted into the adjustment hole 413, so that the lower mounting member 42 and the upper mounting member 41 are jointly arranged to form the above-mentioned mounting channel 401.

[0062] The adjusting member 43 is movably fastened to the adjusting column 422 and abuts against the side of the limiting cylinder 411 facing the supporting ring 421. When the limiting cylinder 411, the flexible sleeve 50 and the cuvette tube 30 are interference-connected with each other, the height of the cuvette tube 30 can be fine-tuned by adjusting the position of the adjusting member 43 on the adjusting column 422. In this way, there is no need to repeatedly adjust the position of the flexible sleeve 50 on the cuvette tube 30, thereby facilitating assembly.

[0063] Optionally, in the above embodiment, the adjusting column 422 has an external thread, and the adjusting member 43 is an adjusting nut, which is threadedly connected to the adjusting column 422. This makes fine adjustment convenient and can also compensate for the inclination error that may exist when the flexible sleeve 50 is clamped with the cuvette tube 30 and the limiting cylinder 411.

[0064] Optionally, in an embodiment provided by the present invention, the limiting cylinder 411 is provided with at least three adjustment holes 413, and the limiting cylinder 411 is evenly arranged in an annular direction on the peripheral wall of the limiting cylinder 411, so as to prevent the cuvette tube 30 from shaking on the positioning frame 40, thereby ensuring the stability of the high-temperature molten salt measuring furnace during operation.

[0065] Preferably, in another embodiment provided by the present invention, the limiting cylinder 411 is provided with four adjustment holes 413, and the four adjustment holes 413 correspond to the four side walls of the cuvette tube 30 respectively, so that the adjustment process of the cuvette tube 30 is more intuitive, and debugging and assembly are convenient.

[0066] Preferably, in one embodiment of the utility model, a plurality of adjustment columns 422 are integrally connected to the support ring 421, and the limiting bracket 414 is integrally connected to the limiting cylinder 411, so that the thermal deformation of the connection between the adjustment column 422 and the support ring 421 and the connection between the limiting bracket 414 and the limiting cylinder 411 are synchronized, which can further reduce the influence of thermal deformation on the colorimetric dish tube 30.

[0067] Optionally, a plurality of first bolt holes 4211 are provided on the support ring 421, and a plurality of second bolt holes corresponding to the first bolt holes 4211 are provided on the top of the measuring furnace body 10, that is, the top of the furnace shell 11. The positioning frame 40 is firmly fixed to the top of the measuring furnace body 10 by bolt fastening, thereby ensuring the stability of the connection between the positioning frame 40 and the measuring furnace body 10 during the operation of the entire high-temperature molten salt measuring furnace.

[0068] Optionally, in an embodiment provided by the present invention, the flexible sleeve 50 is a rubber part.

[0069] 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.

[0070] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A high temperature molten salt measuring furnace, characterized in that: include: A measuring furnace body (10), the measuring furnace body (10) having a molten salt chamber (121) and a plug hole located at the top and connected to the molten salt chamber (121); A positioning frame (40), the positioning frame (40) being fixedly connected to the top of the measuring furnace body (10), the positioning frame (40) having an installation channel (401) vertically connected to the molten salt chamber (121); a cuvette tube (30), the cuvette tube (30) being sequentially inserted into the installation channel (401) and the insertion hole to extend into the molten salt chamber (121); and A flexible sleeve (50) is sleeved on the cuvette tube (30) and inserted into the installation channel (401); the flexible sleeve (50) is interference-engaged with the positioning frame (40) to fix the cuvette tube (30) to the positioning frame (40).

2. A high temperature molten salt measuring furnace according to claim 1, characterized in that: The positioning frame (40) further comprises a limiting step (412) located in the installation channel (401), and the flexible sleeve (50) abuts against the limiting step (412).

3. A high temperature molten salt measuring furnace according to claim 2, characterized in that: The inner diameter of the flexible sleeve (50) in a natural state is 19.9 mm to 100.0 mm, and the outer diameter of the cuvette tube (30) is 20 mm to 100.1 mm.

4. A high temperature molten salt measuring furnace according to claim 3, characterized in that: The outer diameter of the flexible sleeve (50) in a natural state is 30 mm to 100.1 mm, and the inner diameter of the positioning frame (40) at the limiting step (412) is 29.9 mm to 100 mm.

5. A high temperature molten salt measuring furnace according to any one of claims 1 to 4, characterized in that: The positioning frame (40) comprises: An upper mounting member (41), the upper mounting member (41) comprising a limiting cylinder (411) and a limiting step (412) protruding from the inner wall of the limiting cylinder (411), the flexible sleeve (50) being interference-engaged with the inner wall of the limiting cylinder (411) and abutting against the limiting step (412), the upper mounting member (41) further comprising a plurality of adjustment holes (413) penetrating the peripheral wall of the limiting cylinder (411) in the axial direction; a lower mounting member (42), the lower mounting member (42) comprising a support ring (421) fixedly connected to the top of the measuring furnace body (10) and a plurality of adjustment columns (422) extending from the support ring (421) in a direction away from the measuring furnace body (10), the adjustment columns (422) being inserted into the adjustment holes (413) so that the lower mounting member (42) and the upper mounting member (41) surround and form the mounting channel (401); and A plurality of adjusting members (43), wherein the adjusting members (43) are movably and firmly connected to the adjusting column (422) and abut against a side of the limiting cylinder (411) facing the supporting ring (421).

6. A high temperature molten salt measuring furnace according to claim 5, characterized in that: The adjusting column (422) has an external thread, and the adjusting member (43) is an adjusting nut, which is threadedly connected to the adjusting column (422).

7. A high temperature molten salt measuring furnace according to claim 5, characterized in that: The limiting cylinder (411) is provided with at least three adjusting holes (413), and the adjusting holes (413) are evenly arranged in an annular direction on the peripheral wall of the limiting cylinder (411).

8. A high temperature molten salt measuring furnace according to claim 7, characterized in that: The limiting cylinder (411) is provided with four adjusting holes (413), and the positions of the four adjusting holes (413) respectively correspond to the four side walls of the cuvette tube (30).

9. A high temperature molten salt measuring furnace according to claim 5, characterized in that: The upper mounting member (41) further comprises a limiting bracket (414) fixedly connected to the limiting cylinder (411) on a side facing the supporting ring (421), the limiting bracket (414) being inserted into the molten salt chamber (121), and the limiting bracket (414) having a limiting hole (4141) located in the molten salt chamber (121) and matching the shape of the cuvette tube (30).

10. A high temperature molten salt measuring furnace according to claim 9, characterized in that: The adjusting column (422) is integrally connected to the supporting ring (421); and / or The limiting bracket (414) is integrally connected to the limiting cylinder (411).

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