Auxiliary weighing device for Karl Fischer volumetric method moisture determination

Abstract

The utility model provides an auxiliary weighing device for Karl Fischer volumetric method moisture determination. The auxiliary weighing device comprises a chassis, a bracket, two storage racks and a plurality of limiting nuts, a support is arranged at the top of the chassis and connected with the chassis. And two storage racks are arranged at the top of the bracket. A stable platform is provided through the chassis, the device is ensured to be stably placed on the balance, the support at the top of the chassis supports the two adjustable storage racks, the sample injection needle can be stably placed on the storage racks, the storage racks can move in the long axis direction of the support, the distance between the storage racks can be adjusted, and the device can adapt to the sample injection needles of different sizes; the limiting nut is used for limiting the sliding range of the storage rack, and accurate positioning is ensured. According to the utility model, the problem of unstable weighing of the sample injection needle in an experiment can be effectively solved, and the accuracy and the efficiency of Karl Fischer method moisture determination are ensured.

Description

Technical Field

[0001] The utility model relates to an auxiliary weighing device, in particular to an auxiliary weighing device used for Karl Fischer volumetric water content determination, and belongs to the technical field of chemical analysis. Background Art

[0002] Karl Fischer titration, a classic and efficient method for water content determination, is widely used in the chemical, pharmaceutical, and food industries. During this process, a syringe is often used to draw liquid from the sample and inject it into the titration cell. To accurately measure water content, the syringe must be precisely weighed before and after sample injection. However, due to inherent flaws, syringes are too slender and light. When placed horizontally, they can easily roll and contaminate the sample, while when placed vertically, their center of gravity is unstable, significantly interfering with accurate weighing. Utility Model Content

[0003] Based on the above background, the purpose of the present invention is to provide an auxiliary weighing device for Karl Fischer volumetric water determination that can ensure the accuracy of injection needle mass measurement and solve the problems described in the background technology.

[0004] In order to achieve the above-mentioned purpose of the utility model, the utility model provides the following technical solutions:

[0005] An auxiliary weighing device for Karl Fischer volumetric water content determination, comprising a chassis, a bracket, two racks and a plurality of limit nuts;

[0006] A bracket is provided on the top of the chassis, and the bracket is connected to the chassis;

[0007] Two racks are provided on the top of the bracket, and the two racks are movably matched along the direction of the long axis of the bracket;

[0008] A plurality of limiting nuts are provided on the top of the bracket, and the limiting nuts are located on the outside of the storage rack, and the limiting nuts are matched with the bracket threads.

[0009] The chassis is the basic platform of this device, ensuring that the entire device is placed stably on the balance. The bracket on the top of the chassis is used to support two racks, which provide placement for injection needles and syringes. The two racks can be flexibly coordinated along the long axis of the bracket, so that the distance between the two racks can be flexibly adjusted, making this device suitable for injection needles of different sizes. Several limit nuts can limit the racks.

[0010] Preferably, an arc-shaped groove is provided on the top of the storage rack.

[0011] The curved groove can stabilize the injection needle to prevent it from tilting or rolling during weighing.

[0012] Preferably, the two storage racks are arranged correspondingly.

[0013] The two shelves are arranged correspondingly to each other to balance the forces on both ends of the injection needle, thereby preventing the injection needle from tilting or deflecting due to insufficient or unbalanced support on one side.

[0014] Preferably, the chassis, bracket, storage rack and limiting nut are all made of lightweight and corrosion-resistant materials.

[0015] Lightweight and corrosion-resistant materials can reduce the overall weight of the device and effectively resist corrosion from chemical substances.

[0016] Preferably, the number of the limiting nuts is at least four.

[0017] Preferably, the limiting nut is provided with an anti-slip portion, which can enhance the friction between the limiting nut and the bracket, thereby preventing the limiting nut from loosening or sliding during use.

[0018] Preferably, the anti-slip portion of the limit nut is made of polyurethane material.

[0019] Compared with the prior art, the utility model has the following advantages:

[0020] 1. Improve measurement accuracy: Since the injection needle can maintain a stable state in this device, it avoids tilting or swinging, ensuring that the mass measurement of the injection needle is more accurate and reducing weighing errors;

[0021] 2. Reduce contamination risk: The design of this device takes into account the prevention of direct contact between the injection needle and the workbench and other surfaces, thereby avoiding cross contamination caused by contact;

[0022] 3. Improved operational convenience: After using this device, operators can more conveniently handle the weighing and injection steps of the injection needle, reducing the inconvenience caused by manual operation;

[0023] 4. Simple structure and easy to clean: The device has a simple design structure and is easy to clean and maintain, ensuring the convenience of laboratory operation and the long service life of the instrument;

[0024] 5. Wide applicability: This device can be applied to various types of injection needles and is compatible with different types of Karl Fischer titration equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0026] Figure 1 It is a front view of the utility model;

[0027] Figure 2 It is a side view of the utility model;

[0028] Figure 3 It is a top view of the present utility model.

[0029] In the figure: 1. Chassis; 2. Bracket; 3. Storage rack; 4. Limit nut; 5. Groove. DETAILED DESCRIPTION

[0030] The following is a further detailed description of the technical solution of the present invention through specific embodiments and in conjunction with the accompanying drawings. It should be understood that the implementation of the present invention is not limited to the following embodiments, and any form of modification and / or change made to the present invention will fall within the scope of protection of the present invention.

[0031] In this utility model, unless otherwise specified, all parts and percentages are by weight. The equipment and raw materials used are commercially available or commonly used in the art. The methods in the following embodiments, unless otherwise specified, are conventional methods in the art. The components or equipment in the following embodiments, unless otherwise specified, are all common standard parts or components known to those skilled in the art. Their structures and principles are known to those skilled in the art through technical manuals or routine experimental methods.

[0032] The following detailed description of the embodiments of the present invention is made in conjunction with the accompanying drawings. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present invention. However, one or more embodiments can also be implemented by those skilled in the art without these specific details.

[0033] like Figure 1-Figure 3 As shown, an auxiliary weighing device for Karl Fischer volumetric water content determination includes a chassis 1, a bracket 2, two racks 3 and several limiting nuts 4.

[0034] A bracket 2 is provided on the top of the chassis 1, and the bracket 2 is connected to the chassis 1. The chassis 1 is the basic platform of the device, ensuring that the entire device is stably placed on the balance.

[0035] Two racks 3 are mounted on top of bracket 2. Both racks 3 flexibly fit along the long axis of bracket 2. Bracket 2, located atop chassis 1, supports these racks 3. These racks 3 provide a placement for injection needles or syringes. The two racks 3 flexibly fit along the long axis of bracket 2, allowing for flexible adjustment of the distance between them and making the device adaptable to injection needles of varying sizes.

[0036] Two racks 3 are provided correspondingly to balance the forces on both ends of the sample injection needle, avoiding tilting or deviation of the sample injection needle due to insufficient or uneven support on one side. An arc-shaped groove 5 is formed on the top of the rack 3, which can securely hold the sample injection needle and prevent it from tilting or rolling during weighing.

[0037] A plurality of limiting nuts 4 are provided on the top of the support 2, and the limiting nuts 4 are located outside the rack 3 and are in threaded cooperation with the support 2. The plurality of limiting nuts 4 can limit the rack 3. The number of limiting nuts 4 is at least four. The limiting nuts 4 are provided with anti-slip parts. The anti-slip parts can enhance the friction between the limiting nuts 4 and the support 2, preventing the limiting nuts 4 from loosening or sliding during use. The anti-slip parts of the limiting nuts 4 are made of polyurethane material.

[0038] The chassis 1, the support 2, the rack 3, and the limiting nut 4 are all made of lightweight corrosion-resistant materials, preferably polytetrafluoroethylene. The lightweight corrosion-resistant materials can reduce the overall weight of the device and effectively resist chemical corrosion.

[0039] Firstly, the device provides a stable placement environment for the sample injection needle through the precise design of the above structure, ensuring that the sample injection needle can be placed stably during weighing, avoiding weighing errors caused by tilting or shaking of the sample injection needle in traditional operations, and significantly improving the stability of the sample injection needle during quality weighing.

[0040] Secondly, the device can effectively prevent the sample injection needle from directly contacting the workbench or other surfaces, preventing external contamination from affecting the sample injection needle and its contents (such as samples or reagents), ensuring the cleanliness of the sample injection needle, and improving the accuracy and repeatability of the experiment.

[0041] The operation convenience is also one of the outstanding advantages of the device. The cooperation between the sample injection needle and the device is optimized, the structure is simple and easy to operate, allowing the experimental personnel to quickly weigh and sample, improving the efficiency of experimental operation.

[0042] The device is also easy to clean and maintain, ensuring the convenience of laboratory operation and the long-term service life of the instrument.

[0043] Finally, the device also has the function of adapting to multiple sample injection needle specifications, with flexible adjustment of the distance between the two racks 3, making the device compatible with the use requirements of various sample injectors, solving the problem of insufficient universality of traditional devices.

[0044] Through the design and use of the device, the problem of unstable weighing of the sample injection needle in experiments can be effectively solved, ensuring the accuracy and efficiency of Karl Fischer method moisture determination.

[0045] The implementation principle of the auxiliary weighing device for Karl Fischer volumetric water content determination in the utility model is as follows:

[0046] The device is designed to fit the standard syringe or injection needle size commonly used in Karl Fischer titration. The structure of the combination of the chassis 1, the bracket 2 and the two storage racks 3 provides a fixed platform for the injection needle, so that the injection needle remains stable during operation to prevent it from collapsing or shifting, and the injection needle can be placed in an optimal state to avoid contamination or instability.

[0047] During operation, the distance between the two racks 3 is adjusted so that the two racks 3 are suitable for the injection needle to be operated, and then the limit nuts 4 are adjusted according to the positions of the two racks 3 to limit the racks 3. Then, the device is fixed on the balance, and the injection needle is placed on the two racks 3, so that the mass of the injection needle can be measured. Due to the structural characteristics of the device, the injection needle can be easily taken out for injection or re-weighing without affecting the test accuracy.

[0048] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An auxiliary weighing device for Karl Fischer volumetric water content determination, characterized in that: The Karl Fischer water content determination injection needle base comprises a base plate (1), a bracket (2), two storage racks (3) and a plurality of limiting nuts (4); A bracket (2) is provided on the top of the chassis (1), and the bracket (2) is connected to the chassis (1); Two storage racks (3) are provided on the top of the bracket (2), and the two storage racks (3) are movably matched along the direction of the long axis of the bracket (2); A plurality of limiting nuts (4) are provided on the top of the bracket (2), and the limiting nuts (4) are located outside the storage rack (3), and the limiting nuts (4) are threadedly matched with the bracket (2).

2. The auxiliary weighing device for Karl Fischer volumetric water content determination according to claim 1, characterized in that: An arc-shaped groove (5) is provided on the top of the storage rack (3).

3. The auxiliary weighing device for Karl Fischer volumetric water content determination according to claim 1, characterized in that: The two storage racks (3) are arranged correspondingly.

4. The auxiliary weighing device for Karl Fischer volumetric water content determination according to claim 1, characterized in that: The chassis (1), bracket (2), storage rack (3) and limiting nut (4) are all made of lightweight, corrosion-resistant materials.

5. The auxiliary weighing device for Karl Fischer volumetric water content determination according to claim 4, characterized in that: The number of the limiting nuts (4) is at least four.

6. The auxiliary weighing device for Karl Fischer volumetric water content determination according to claim 5, characterized in that: The limiting nut (4) is provided with an anti-slip portion.

7. The auxiliary weighing device for Karl Fischer volumetric water content determination according to claim 6, characterized in that: The anti-slip portion of the limiting nut (4) is made of polyurethane material.

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