Crucible changing device and elemental analyzer

Abstract

The utility model discloses a kind of crucible replacement devices, including lifting datum plate, translation datum plate and crucible seat, sample sending sealing seat is equipped on the crucible seat, sample sending sealing seat is equipped on the sample sending rod, the top of the sample sending rod is equipped with the load-bearing platform for carrying crucible, the crucible seat is moved and arranged on translation datum plate along horizontal direction, translation datum plate is moved and arranged on lifting datum plate along vertical direction, and the lifting datum plate is used to be fixedly connected with the high-temperature furnace of elemental analyzer.The utility model further discloses a kind of elemental analyzer.The utility model has the advantages of simple structure and low failure rate.

Description

Technical Field

[0001] This utility model relates to the field of testing equipment technology, and in particular to a crucible replacement device and an elemental analyzer. Background Technology

[0002] In elemental analyzers, crucibles are placed in a high-temperature furnace. Samples are dropped one by one from a sample-dropping mechanism at the top of the furnace into the crucibles for testing. After the test, residue remains in the crucibles. Therefore, after every 350 samples, the crucibles are full of residue and need to be replaced. In traditional carbon, hydrogen, and nitrogen elemental analyzers, replacing the crucibles requires removing the sample-dropping mechanism above the high-temperature furnace.

[0003] An existing carbon, hydrogen, and nitrogen elemental analyzer can automatically change crucibles. For example... Figure 1 As shown, crucible 9 is placed on sample delivery rod 32, sample delivery rod 32 is fixed on sample delivery sealing seat 31, sample delivery sealing seat 31 is fixed on crucible changing mechanism. Through the lifting and translating motion of crucible changing mechanism, crucible 9 is moved from inside combustion tube to crucible changing port of instrument. After manual replacement of crucible 9, crucible 9 is moved into combustion tube 41 of high temperature furnace 4 through lifting and translating motion of crucible changing mechanism.

[0004] In this elemental analyzer, the sample delivery rod 32 is a component that supports the crucible 9. Because it is constantly exposed to the high-temperature environment of approximately 900°C inside a furnace, it needs to be heat-resistant, corrosion-resistant, and chemically stable. Therefore, quartz glass is selected as the material. However, quartz glass is fragile and cannot withstand impacts or severe vibrations. In actual use, this results in problems such as easy breakage of the sample delivery rod and a high failure rate. Specifically, the sample delivery rod 32 is fixed to the sample delivery sealing seat 31. The sample delivery sealing seat 31 has two layers of springs at its bottom. When the sample delivery sealing seat 31 moves up and down, it vibrates when it enters or leaves the furnace sealing seat 42. This places high demands on the positional accuracy of the furnace sealing seat 42 and the sample delivery sealing seat 31. The furnace sealing seat 42 is fixed on the base of the high-temperature furnace 4, and the crucible changing mechanism that fixes the sample delivery sealing seat 31 is fixed on the base 6 of the pot changing mechanism. The two have different references and poor positional accuracy. Moreover, the pot changing mechanism uses Hall effect sensing for positioning, which has low positioning accuracy. When the positional deviation between the furnace sealing seat 42 and the sample delivery sealing seat 31 is large, the violent shaking will lead to rod breakage.

[0005] The reasons for the easy breakage of the rod are as follows: 1. There is a positional fit accuracy requirement between the furnace sealing seat 42 and the sample delivery sealing seat 31, but the positioning accuracy of the crucible changing mechanism is not high. The crucible changing mechanism that installs the sample delivery sealing seat 31 and the furnace sealing seat 42 are installed on two different bases, resulting in even worse positional accuracy; 2. The two layers of springs of the sample delivery sealing seat 42 are flexibly connected to improve the adaptability of the positional error between the two, but cannot completely eliminate the positional error, and instead bring about the vibration problem. Utility Model Content

[0006] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art, provide a crucible replacement device with simple structure and low failure rate, and provide an elemental analyzer.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A crucible replacement device includes a lifting reference plate, a translation reference plate, and a crucible base. The crucible base is provided with a sample delivery sealing seat, and the sample delivery sealing seat is provided with a sample delivery rod. The top end of the sample delivery rod is provided with a support platform for supporting the crucible. The crucible base is movably mounted on the translation reference plate in a horizontal direction, and the translation reference plate is movably mounted on the lifting reference plate in a vertical direction. The lifting reference plate is used for fixed connection with the high-temperature furnace of an elemental analyzer.

[0008] As a further improvement to the above technical solution: The translation reference plate has a limiting groove, and the bottom of the crucible seat is provided with a positioning slide post. The positioning slide post passes through the limiting groove and can move relative to the limiting groove. When the positioning slide post moves to the limiting position of the limiting groove, the sample delivery sealing seat is aligned with the furnace sealing seat of the elemental analyzer.

[0009] The translation reference plate is provided with a first drive assembly and a first lead screw and nut assembly. The first lead screw and nut assembly includes a first lead screw and a first lead screw nut that cooperate with each other. The first drive assembly is connected to the first lead screw to drive the first lead screw to rotate. The first lead screw and nut are connected to the crucible holder.

[0010] The translation reference plate is also provided with a first slider guide rail assembly, which includes a first guide rail and a first slider. The first slider is slidably mounted on the first guide rail by ball bearings and is connected to the crucible holder.

[0011] The lifting reference plate is provided with a second drive assembly and a second lead screw and nut assembly. The second lead screw and nut assembly includes a second lead screw and a second lead screw nut that cooperate with each other. The second drive assembly is connected to the second lead screw to drive the second lead screw to rotate. The second lead screw and nut are connected to the translation reference plate.

[0012] The lifting reference plate is also provided with a second slider guide rail assembly, which includes a second guide rail and a second slider. The second slider is slidably mounted on the second guide rail by ball bearings and is connected to the translation reference plate.

[0013] There are two second slider guide assemblies, which are symmetrically arranged on both sides of the second lead screw.

[0014] The first drive assembly includes a first motor and a first synchronous belt, the first synchronous belt being wound between the output end of the first motor and the first lead screw.

[0015] An elemental analyzer includes a high-temperature furnace and the aforementioned crucible replacement device. The high-temperature furnace is equipped with a combustion tube, and a furnace sealing seat is provided at the bottom of the combustion tube. The furnace sealing seat and the lifting reference plate are both fixed to the bottom wall of the high-temperature furnace.

[0016] As a further improvement to the above technical solution: The high-temperature furnace is equipped with a sample dropping mechanism above it for dropping samples into the crucible.

[0017] Compared with the prior art, the advantages of this utility model are: 1. The crucible replacement device of this utility model is fixedly connected to the high-temperature furnace through a lifting reference plate, so that the sample delivery sealing seat on the lifting reference plate and the furnace sealing seat of the high-temperature furnace are located at the same reference, which has high positional accuracy, reduces the deviation between the sample delivery sealing seat and the furnace sealing seat, and eliminates the need for flexible parts such as springs, resulting in a simple structure, reducing the vibration of the sample delivery rod, reducing the damage to the sample delivery rod, and having a low failure rate.

[0018] 2. In the crucible replacement device of this utility model, the limiting groove is arranged in the horizontal direction. When the positioning slide column moves to one end of the limiting groove, it cannot continue to move due to the limiting effect of the limiting groove. At this time, the sample delivery sealing seat is aligned with the furnace sealing seat of the elemental analyzer. The sample delivery sealing seat is positioned by mechanical limiting, and the position accuracy of the sample delivery sealing seat is higher.

[0019] 3. The elemental analyzer of this utility model is fixed to the bottom wall of the high-temperature furnace by both the furnace sealing seat and the lifting reference plate, so that the sample delivery sealing seat and the furnace sealing seat are located on the same reference, which has high positional accuracy, reduces the deviation between the sample delivery sealing seat and the furnace sealing seat, and eliminates the need for flexible parts such as springs, which simplifies the structure, reduces the vibration of the sample delivery rod, reduces the damage to the sample delivery rod, and has a low failure rate. Attached Figure Description

[0020] Figure 1 This is the main view of an existing elemental analyzer.

[0021] Figure 2 This is a schematic diagram of the crucible replacement device of this utility model.

[0022] Figure 3 This is the front view of the elemental analyzer of this utility model.

[0023] The labels in the diagram represent: 1. Lifting reference plate; 11. Second drive assembly; 111. Second motor; 112. Second synchronous belt; 12. Second lead screw and nut assembly; 121. Second lead screw; 13. Second slider guide rail assembly; 131. Second guide rail; 132. Second slider; 2. Translation reference plate; 21. Limiting slot; 22. First drive assembly; 221. First motor; 222. First synchronous belt; 23. First lead screw and nut assembly; 231. First lead screw; 24. First slider guide rail assembly; 241. First guide rail; 242. First slider; 3. Crucible holder; 31. Sample delivery sealing seat; 32. Sample delivery rod; 33. Support platform; 34. Positioning slide column; 4. High-temperature furnace; 41. Combustion tube; 42. Furnace sealing seat; 5. Sample dropping mechanism; 6. Pot changing mechanism base; 9. Crucible. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] Example 1: like Figure 2 and Figure 3As shown, the crucible replacement device of this embodiment includes a lifting reference plate 1, a translation reference plate 2, and a crucible seat 3. The crucible seat 3 is provided with a sample delivery sealing seat 31, and a sample delivery rod 32 is provided on the sample delivery sealing seat 31. The top end of the sample delivery rod 32 is provided with a support platform 33 for supporting the crucible 9. The crucible seat 3 is moved horizontally on the translation reference plate 2, and the translation reference plate 2 is moved vertically on the lifting reference plate 1. The lifting reference plate 1 is used to be fixedly connected to the high-temperature furnace 4 of the elemental analyzer.

[0029] In this embodiment of the crucible replacement device, during crucible replacement, the translation reference plate 2 descends, moving the crucible 9 out of the high-temperature furnace 4. The crucible seat 3 then moves horizontally to a position where it does not interfere with the high-temperature furnace 4, removing the old crucible 9. A new crucible 9 is then loaded onto the support platform 33. The crucible seat 3 moves horizontally below the high-temperature furnace 4, and the translation reference plate 2 moves the crucible seat 3 upwards until the sample delivery sealing seat 31 contacts and seals with the furnace sealing seat 42 of the high-temperature furnace 4. The new crucible 9 is then moved into the high-temperature furnace 4, completing the crucible replacement. In this embodiment, the crucible replacement device is fixedly connected to the high-temperature furnace 4 via the lifting reference plate 1, ensuring that the sample delivery sealing seat 31 on the lifting reference plate 1 and the furnace sealing seat 42 of the high-temperature furnace 4 are located at the same reference, resulting in high positional accuracy and reducing deviation between the sample delivery sealing seat 31 and the furnace sealing seat 42. Furthermore, it eliminates the need for flexible components such as springs, simplifying the structure, reducing vibration of the sample delivery rod 32, lowering damage to the sample delivery rod 32, and reducing the failure rate.

[0030] Furthermore, in this embodiment, a limiting groove 21 is formed on the translation reference plate 2, and a positioning slide post 34 is provided at the bottom of the crucible seat 3. The positioning slide post 34 passes through the limiting groove 21 and can move relative to the limiting groove 21. When the positioning slide post 34 moves to the limiting position of the limiting groove 21, the sample delivery sealing seat 31 is aligned with the furnace sealing seat 42 of the elemental analyzer. The limiting groove 21 is arranged in a horizontal direction. When the positioning slide post 34 moves to one end of the limiting groove 21, the positioning slide post 34 cannot continue to move due to the limiting effect of the limiting groove 21. At this time, the sample delivery sealing seat 31 is aligned with the furnace sealing seat 42 of the elemental analyzer. The sample delivery sealing seat 31 is positioned by mechanical limiting, and the positional accuracy of the sample delivery sealing seat 31 is higher.

[0031] Furthermore, in this embodiment, the translation reference plate 2 is provided with a first driving assembly 22 and a first lead screw and nut assembly 23. The first lead screw and nut assembly 23 includes a cooperating first lead screw 231 and a first lead screw nut. The first driving assembly 22 is connected to the first lead screw 231 to drive the first lead screw 231 to rotate, and the first lead screw nut is connected to the crucible holder 3. The lead screw drive method has high transmission accuracy, can reduce the shaking during the movement of the sample feeding rod 32, and ensures smooth movement of the crucible holder 3.

[0032] Furthermore, in this embodiment, the translation reference plate 2 is also provided with a first slider guide rail assembly 24, which includes a first guide rail 241 and a first slider 242. The first slider 242 is slidably mounted on the first guide rail 241 via ball bearings and is connected to the crucible seat 3. By adding the first guide rail 241 for guidance on the basis of the lead screw drive, the movement of the crucible seat 3 is more stable.

[0033] Furthermore, in this embodiment, the lifting reference plate 1 is provided with a second drive assembly 11 and a second lead screw and nut assembly 12. The second lead screw and nut assembly 12 includes a cooperating second lead screw 121 and a second lead screw nut. The second drive assembly 11 is connected to the second lead screw 121 to drive the second lead screw 121 to rotate, and the second lead screw nut is connected to the translation reference plate 2. The lead screw drive method has high transmission accuracy, which can reduce the shaking during the movement of the sample feeding rod 32, and make the translation reference plate 2 move smoothly.

[0034] Furthermore, in this embodiment, the lifting reference plate 1 is also provided with a second slider guide rail assembly 13. The second slider guide rail assembly 13 includes a second guide rail 131 and a second slider 132. The second slider 132 is slidably mounted on the second guide rail 131 via ball bearings and is connected to the translation reference plate 2. By adding a second guide rail 131 for guidance on the basis of screw drive, the translation reference plate 2 moves more smoothly.

[0035] Furthermore, in this embodiment, two second slider guide rail assemblies 13 are provided, and the two second slider guide rail assemblies 13 are symmetrically arranged on both sides of the second lead screw 121. When the crucible seat 3 and the crucible 9 and other components on the crucible seat 3 move, the center of gravity of the translation reference plate 2 will change. By setting two second slider guide rail assemblies 13, the movement of the translation reference plate 2 on the lifting reference plate 1 is made more stable.

[0036] Furthermore, in this embodiment, the first drive assembly 22 includes a first motor 221 and a first synchronous belt 222, with the first synchronous belt 222 wound between the output end of the first motor 221 and the first lead screw 231. The second drive assembly 11 includes a second motor 111 and a second synchronous belt 112, with the second synchronous belt 112 wound between the output end of the second motor 111 and the second lead screw 121. Both the first drive assembly 22 and the second drive assembly 11 use synchronous belt pulleys for transmission, resulting in smooth transmission and convenient maintenance.

[0037] Example 2: like Figure 2 and Figure 3As shown, the elemental analyzer of this embodiment includes the crucible replacement device of Embodiment 1 and a high-temperature furnace 4. The high-temperature furnace 4 is provided with a combustion tube 41, and a furnace sealing seat 42 is provided at the bottom of the combustion tube 41. The furnace sealing seat 42 and the lifting reference plate 1 are both fixed on the bottom wall of the high-temperature furnace 4.

[0038] In this embodiment, the elemental analyzer is fixed to the bottom wall of the high-temperature furnace 4 by both the furnace sealing seat 42 and the lifting reference plate 1, so that the sample delivery sealing seat 31 and the furnace sealing seat 42 are located at the same reference, which has high positional accuracy, reduces the deviation between the sample delivery sealing seat 31 and the furnace sealing seat 42, and eliminates the need for flexible parts such as springs, resulting in a simple structure, reduced vibration of the sample delivery rod 32, reduced damage to the sample delivery rod 32, and low failure rate.

[0039] Furthermore, in this embodiment, a sample dropping mechanism 5 for dropping samples into the crucible 9 is provided above the high-temperature furnace 4. The sample dropping mechanism 5 can drop samples into the crucible 9 located inside the combustion tube 41, and its structure is simple and reliable.

[0040] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present utility model using the methods and techniques disclosed above, or modify it into equivalent embodiments with equivalent changes, without departing from the spirit and technical solution of the present utility model. Therefore, any simple modifications, equivalent substitutions, equivalent changes and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the content of the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A crucible replacement device, characterized in that: The instrument includes a lifting reference plate (1), a translation reference plate (2), and a crucible seat (3). The crucible seat (3) is provided with a sample delivery sealing seat (31), and the sample delivery sealing seat (31) is provided with a sample delivery rod (32). The top of the sample delivery rod (32) is provided with a support platform (33) for supporting the crucible (9). The crucible seat (3) is moved horizontally on the translation reference plate (2), and the translation reference plate (2) is moved vertically on the lifting reference plate (1). The lifting reference plate (1) is used to be fixedly connected to the high-temperature furnace (4) of the elemental analyzer.

2. The crucible replacement device according to claim 1, characterized in that: The translation reference plate (2) has a limiting groove (21), and the crucible seat (3) has a positioning slide (34) at the bottom. The positioning slide (34) passes through the limiting groove (21) and can move relative to the limiting groove (21). When the positioning slide (34) moves to the limiting position of the limiting groove (21), the sample delivery sealing seat (31) is aligned with the furnace sealing seat (42) of the elemental analyzer.

3. The crucible replacement device according to claim 1, characterized in that: The translation reference plate (2) is provided with a first drive assembly (22) and a first lead screw and nut assembly (23). The first lead screw and nut assembly (23) includes a first lead screw (231) and a first lead screw nut that cooperate with each other. The first drive assembly (22) is connected to the first lead screw (231) to drive the first lead screw (231) to rotate. The first lead screw and nut is connected to the crucible seat (3).

4. The crucible replacement device according to claim 3, characterized in that: The translation reference plate (2) is also provided with a first slider guide rail assembly (24), which includes a first guide rail (241) and a first slider (242). The first slider (242) is slidably mounted on the first guide rail (241) by ball bearings and is connected to the crucible seat (3).

5. The crucible replacement device according to claim 1, characterized in that: The lifting reference plate (1) is provided with a second drive assembly (11) and a second lead screw nut assembly (12). The second lead screw nut assembly (12) includes a cooperating second lead screw (121) and a second lead screw nut. The second drive assembly (11) is connected to the second lead screw (121) to drive the second lead screw (121) to rotate. The second lead screw nut is connected to the translation reference plate (2).

6. The crucible changing device according to claim 5, characterized in that: The lifting reference plate (1) is also provided with a second slider guide rail assembly (13), which includes a second guide rail (131) and a second slider (132). The second slider (132) is slidably mounted on the second guide rail (131) by ball bearings and is connected to the translation reference plate (2).

7. The crucible replacement device according to claim 6, characterized in that: There are two second slider guide rail assemblies (13), and the two second slider guide rail assemblies (13) are symmetrically arranged on both sides of the second lead screw (121).

8. The crucible replacement device according to claim 3, characterized in that: The first drive assembly (22) includes a first motor (221) and a first synchronous belt (222), the first synchronous belt (222) being wound between the output end of the first motor (221) and the first lead screw (231).

9. An elemental analyzer, characterized in that: The device includes a high-temperature furnace (4) and the crucible replacement device according to any one of claims 1 to 8. The high-temperature furnace (4) is provided with a combustion tube (41), and a furnace sealing seat (42) is provided at the bottom of the combustion tube (41). The furnace sealing seat (42) and the lifting reference plate (1) are both fixed on the bottom wall of the high-temperature furnace (4).

10. The elemental analyzer according to claim 9, characterized in that: The high-temperature furnace (4) is provided with a sample dropping mechanism (5) for dropping samples into the crucible (9) above it.

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