A calorimeter measuring cup cover for automated operations and a method of assembling the same

Abstract

The present application relates to a kind of automatic operation with calorimeter measuring cup cover and its assembling method.The cup cover includes upper cover (01), middle cover (02) and lower cover (03) in turn;The mushroom head (010) for automatic operation is equipped on the upper cover (01), and the upper cover (01) is integrated structure.The upper cover (01) is the structure of wide at top and narrow at bottom, and the outer edge forms taper.The material of the upper cover (01) is consistent with the material of calorimeter main body.The material strength of the upper cover (01) is greater than the material of middle cover (02).Compared with prior art, the present application has the advantages of guaranteeing the sealing property of calorimeter cup and the stability of heat transfer, while meeting the convenience of automatic operation.

Description

Technical Field

[0001] This invention relates to the field of automated measurement of radioactive materials, specifically to a lid for an automated calorimeter measuring cup and its assembly method. Background Technology

[0002] In automated calorimeters, the calorimeter cup lid is a frequently operated moving part. Its structural design and manufacturing quality must ensure its operability during the automated gripping process. At the same time, the stability of the thermal channel between the calorimeter cup and the calorimeter body must be guaranteed under the condition of achieving automated operation, so as to ensure the accuracy of the measurement results.

[0003] The calorimeter lid consists of three layers of materials with different heat transfer coefficients. In a calorimeter, the lower lid layer needs to be made of the same material as the calorimeter cup, and the upper lid layer needs to be made of the same material as the calorimeter element. Current calorimeters use foam board as the insulation material for the lid. In existing dynamic K-value calorimeters, the lid has been redesigned, using ABS instead of foam board, and the three layers are connected together with a plastic connecting rod, significantly improving operational convenience. A schematic diagram is shown below. Figure 2 .

[0004] like Figure 2 As shown, the three-layer lid is connected by a plastic connecting rod. Due to the different materials of each layer, the top and bottom lids are metal, while the middle lid is made of ABS material. The linear thermal expansion coefficient of copper at 20℃ is 17 × 10⁻⁶. -6 / K, the linear thermal expansion coefficient of ABS is (36-98)×10 -6 Between / K, there is a significant difference between the two materials. To ensure the stability of the calorimeter's heat transfer channel, the assembly gap between the lid and the thermostat must be as small as possible, with the diameter machining accuracy generally controlled within 0.02mm. The difference in thermal expansion coefficients can easily cause the lid to jam. During manual operation, the lid often cannot be removed. In automated operation, a jammed lid will cause the robot to directly break off the lid handle, resulting in equipment damage.

[0005] Meanwhile, because the calorimeter has strict requirements for the heat transfer channel, the diameter tolerance of the cup lid is on the order of 0.02 mm, while the repeatability of the calorimeter automated operation robot is on the order of 0.2 mm, the automated operation cannot accurately close the cup lid. Summary of the Invention

[0006] The purpose of this invention is to overcome at least one of the defects of the prior art and provide an automated calorimeter measuring cup lid and its assembly method that ensures the sealing and heat transfer stability of the calorimeter cup while satisfying the convenience of automated operation.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] An automated calorimeter measuring cup lid is disclosed, comprising a top cover, a middle cover, and a bottom cover nested together. The top cover has a mushroom-shaped head for automated operation and is a one-piece molded structure. This design increases the strength of the handle and reduces the risk of handle breakage due to lid jamming. To minimize errors introduced by the lid's placement during operation, the number of operations needs to be reduced, simplifying the process. By assembling the existing top, middle, and bottom lids of the calorimeter into a single unit, the operation can be completed in a single step without compromising the instrument's measurement performance.

[0009] Furthermore, the lower cover is fitted inside the middle cover, and the middle cover is fitted inside the upper cover. The upper cover forms a semi-enclosed structure with respect to the middle cover. The middle cover also forms a semi-enclosed structure with respect to the lower cover.

[0010] Furthermore, the outer diameter of the middle cover is equal to the inner diameter of the groove in the upper cover, and the outer diameter of the lower cover is equal to the inner diameter of the groove in the middle cover.

[0011] Furthermore, the upper cover has a structure that is wider at the top and narrower at the bottom, with an outer edge that tapers by approximately 2°. When placing the lid, it slides down along the conical surface, enabling automated placement and removal of the calorimeter lid.

[0012] Furthermore, the material of the top cover is the same as that of the calorimeter body.

[0013] Furthermore, the upper cover is made of a material with greater strength than the middle cover.

[0014] Furthermore, the upper and lower covers are made of T2 copper, while the middle cover is made of ABS. ABS is a terpolymer of acrylonitrile, butadiene, and styrene, which organically combines the various properties of PB, PAN, and PS, possessing excellent mechanical properties with a balance of toughness, hardness, and rigidity. It has excellent impact resistance and heat resistance, and is also easy to process, has stable product dimensions, and good surface gloss. Because the strength of metal is much greater than that of ABS, the middle cover is confined within a fixed range by the upper cover. Since the upper cover is made of the same material as the calorimeter body, even temperature changes will not cause the lid to jam.

[0015] A method for assembling the lid of a calorimeter measuring cup for automated operation as described above, the method comprising the following steps:

[0016] Assembly of the top cover and the middle cover: Heat the top cover and cool the middle cover, then quickly assemble the top cover and the middle cover, and form an interference fit after returning to room temperature;

[0017] Assembly of the middle and lower covers: Heat the assembled upper and middle covers while cooling the lower cover. Then quickly assemble the lower cover into the middle cover and allow it to return to room temperature to form an interference fit.

[0018] Furthermore, the heating temperature is 90-100℃.

[0019] Furthermore, the cooling temperature of the middle cover is -30 to -18°C; the cooling temperature of the lower cover is -196 to -180°C.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] (1) In this invention, the existing upper, middle and lower cup lids of the calorimeter cup lid are assembled into a whole. During operation, the three cup lids can be removed and placed in one operation without reducing the measurement performance of the instrument.

[0022] (2) In this invention, the copper top cover forms a semi-enclosed structure with the ABS middle cover. Even if the ABS expands due to temperature changes, the middle cover will be restricted within a fixed range by the top cover because the strength of the metal material is much greater than that of the ABS.

[0023] (3) In this invention, the top cover is made of the same material as the calorimeter body, so the lid will not get stuck even if the temperature changes. The top cover has a tapered side, so when the robot places the lid, the lid slides down the tapered surface, realizing automated picking and placing of the calorimeter lid;

[0024] (4) After adopting the calorimeter cup lid of the present invention, a robot with a repeatability accuracy of 0.5 mm can be used to complete the picking and placing of the calorimeter cup lid, which meets the development requirements of an automated calorimeter system. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the cup lid structure in the embodiment;

[0026] Figure 2 This is a schematic diagram of the existing dynamic K-value calorimeter cup lid;

[0027] The numbers in the diagram are as follows: Top cover 01, Mushroom head 010, Middle cover 02, Bottom cover 03;

[0028] 1-Cup lid handle; 2-Plastic connecting rod; 3-Existing top cover; 4-Existing middle cover; 5-Existing bottom cover; 6-Nut. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0030] Example

[0031] An automated calorimeter measuring cup lid and its assembly method, such as... Figure 2 The cup lid comprises an upper lid 01, a middle lid 02, and a lower lid 03, which are sequentially fitted together. The upper lid 01 has a mushroom-shaped head 010 for automated operation and is a one-piece molded structure. The lower lid 03 is fitted inside the middle lid 02, and the middle lid 02 is fitted inside the upper lid 01. The outer diameter of the middle lid 02 is equal to the inner diameter of the groove in the upper lid 01, and the outer diameter of the lower lid 03 is equal to the inner diameter of the groove in the middle lid 02. The upper lid 01 has a structure that is wider at the top and narrower at the bottom, with a tapered outer edge. The material of the upper lid 01 is the same as that of the calorimeter body. The material strength of the upper lid 01 is greater than that of the middle lid 02, as detailed below:

[0032] The main body of the top cover 01 is a frustum-shaped structure, using T2 copper as the processing material. The thickness of the top cover 01 is 3-5cm, the diameter is 10-30cm, the side wall thickness is 10mm, the outer circle has a 2° taper, the top is wider and the bottom is narrower, the groove depth is 2.5-3cm, and it is machined from a single piece of copper ingot. The shape of the mushroom head 010 is customized according to the gripping parts of the robotic arm.

[0033] The main body of the middle cover 02 is a cylindrical structure, and annealed ABS is used as the processing material. The middle cover 02 is a cylindrical structure with a thickness of 2-3cm and a diameter of 10-30cm. The outer diameter of the middle cover 02 is equal to the inner diameter of the groove of the upper cover 01. The side wall thickness is 2-3cm and the groove depth is 3-5mm. It is machined from a single piece of ABS.

[0034] The lower cover 03 has a cylindrical structure and uses T2 copper as the raw material. The lower cover 03 has a thickness of 2-3mm and a diameter of 10-30cm. The outer diameter of the lower cover 03 is equal to the inner diameter of the groove of the middle cover 02. The side wall thickness is 2-3mm and the groove depth is 2-3mm. It is machined from a single piece of copper ingot.

[0035] Cup lid assembly: The general assembly sequence is as follows: press the top lid 01, middle lid 02, and bottom lid 03 together. Figure 1 As shown, the assembly process is as follows: First, assemble the upper cover 01 and the middle cover 02, then assemble the middle cover 02 and the lower cover 03, as detailed below:

[0036] Assembly of top cover 01 and middle cover 02: Place top cover 01 in a 100℃ hot air oven for 30 minutes, and middle cover 02 in a -20℃ refrigerator for 60 minutes. Use special tooling to quickly assemble the two and return them to room temperature to form an interference fit.

[0037] Assembly of middle cover 02 and lower cover 03: After assembling the upper cover 01 and middle cover 02, place them in a 90℃ hot air oven for 30 minutes. Cool the lower cover 03 in a liquid nitrogen insulation tank for 30 minutes. Use special tooling to quickly assemble the two and restore them to room temperature to form an interference fit.

[0038] Finally, use a micrometer to measure the height of the assembled cup lid, and then perform precision machining on the assembled cup lid as needed.

[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for assembling the lid of an automated calorimeter measuring cup, characterized in that, The cup lid includes an upper lid (01), a middle lid (02), and a lower lid (03) that are connected in sequence; the upper lid (01) is provided with a mushroom head (010) for automated operation, and the upper lid (01) is a one-piece molded structure; The lower cover (03) is fitted inside the middle cover (02), and the middle cover (02) is fitted inside the upper cover (01); The outer diameter of the middle cover (02) is equal to the inner diameter of the groove of the upper cover (01), and the outer diameter of the lower cover (03) is equal to the inner diameter of the groove of the middle cover (02); The upper cover (01) has a structure that is wider at the top and narrower at the bottom, with a tapered outer edge, forming a semi-enclosed structure for the middle cover; The material of the upper cover (01) is the same as that of the calorimeter body; The material strength of the upper cover (01) is greater than that of the middle cover (02); The upper cover (01) and lower cover (03) are made of T2 copper, and the middle cover (02) is made of ABS. The assembly method for the lid of the calorimeter measuring cup used in this automated operation is as follows: Assembly of the upper cover (01) and the middle cover (02): After heating the upper cover (01) and cooling the middle cover (02), quickly assemble the upper cover (01) and the middle cover (02) to form an interference fit after returning to room temperature; the heating temperature of the upper cover (01) is 90~100℃ and the heating time is ≥30min; the cooling temperature of the middle cover (02) is -30~-18℃; Assembly of the middle cover (02) and the lower cover (03): Heat the assembled upper cover (01) and middle cover (02) while cooling the lower cover (03), and then quickly assemble the lower cover (03) into the middle cover (02) to form an interference fit after returning to room temperature; the heating temperature of the upper cover (01) and the middle cover (02) is 90~100℃ and the heating time is ≥30min; the cooling temperature of the lower cover (03) is -196~-180℃.

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