Hand-held duster

Abstract

A hand-held spreader for spreading catalyst tungsten trioxide in a combustion boat when determining the sulfur content of a coal sample using a coulometric sulfur analyzer belongs to the technical field of laboratory detection auxiliary equipment. The spreader comprises a bottom-capped material pipe, a cap sleeve arranged at the head of the material pipe, a spout arranged at the small end of the cap and matching the width of the combustion boat in inner diameter, and a uniform net arranged at the head of the material pipe and enclosed by the cap. The uniform net is composed of a cylindrical frame and an end face mesh material, ensuring uniform dispersion of the catalyst. The utility model optimizes the mechanical structure, solves the problems of complicated operation, poor uniformity, easy waste of the existing manual spreading method, and complicated structure and high cost of automatic equipment, realizes rapid, uniform and accurate spreading of the tungsten trioxide catalyst thin layer, effectively improves the accuracy and consistency of the detection results, and has the advantages of simple structure, low cost, convenient and flexible operation, and is especially suitable for popularization and application in various laboratories.

Description

Technical Field

[0001] This utility model relates to a handheld sprinkler, and more particularly to a handheld sprinkler for spreading tungsten trioxide catalyst in a combustion boat when using a coulometric sulfur analyzer to determine the sulfur content of coal samples. It belongs to the field of manufacturing technology of auxiliary tools for laboratory testing equipment. Background Technology

[0002] Coulometric sulfur analyzers are widely used for determining the total sulfur content in materials such as coal, coke, and petroleum. The principle is that the sample is burned and decomposed in an air stream under the action of a tungsten trioxide catalyst. The sulfur in the sample is converted into sulfur oxides, and the sulfur dioxide is absorbed by a potassium iodide solution. The total sulfur content is calculated by titrating the iodine produced from the electrolysis of the potassium iodide solution and considering the amount of electricity consumed in the electrolysis. The instrument mainly includes a sample processing and combustion unit, a gas path and purification unit, an electrolytic cell for detection and titration, and a control and calculation system. The sample processing and combustion unit includes a sample delivery device / transmission mechanism, a high-temperature furnace / combustion furnace, and a combustion tube and combustion boat. The combustion boat, made of porcelain or corundum, is used to hold the sample and must withstand temperatures above 1200℃.

[0003] During the testing of coal samples, a thin layer of tungsten trioxide catalyst needs to be applied to the surface of the coal sample in the combustion boat to ensure complete combustion. The application of the tungsten trioxide catalyst must comply with the requirements of the national standard GB / T214-2007.

[0004] Currently, the process of covering coal with tungsten trioxide in the laboratory mainly relies on manual methods. For example, operators use a sample spoon to scoop up tungsten trioxide and then shake or pull the spoon over a ceramic boat to allow the catalyst to fall onto the coal sample surface. This method is cumbersome and makes it difficult to control the uniformity of the catalyst, easily leading to uneven distribution on the coal sample surface. Other common methods include using the friction between the sample spoon and the edge of the combustion boat to generate vibration and cause the tungsten trioxide to fall, or tapping the wrist to vibrate the sample spoon and scatter the catalyst. Clearly, these methods have significant drawbacks. Improper angle control of the sample spoon can disturb the coal sample, altering its quality; inaccurate force control can lead to excessive tungsten trioxide spillage or spillage outside the combustion boat, resulting in waste. Furthermore, the low operational efficiency and inability to guarantee consistent coverage thickness are the biggest drawbacks, affecting the accuracy and efficiency of detection.

[0005] The utility model patent "Coulomb sulfur analyzer and its powder dispensing device" (authorization announcement number: CN 204228659 U) provides an automated solution, including a support, a material cylinder, and a drive assembly. The drive assembly causes the powdered material in the material cylinder to fall into a ceramic boat through a discharge hole. Although the device achieves automated operation, its structure is complex, it relies on a motor and control system, its cost is high, and it is not suitable for small laboratories or places requiring flexible operation.

[0006] Another invention patent application, "A Neutralization-Based Sulfur Analyzer with Automatic Tungsten Trioxide Spraying Function" (application number: CN201510531491.7), provides a neutralization-based sulfur analyzer with automatic tungsten trioxide spraying function. This analyzer achieves automatic tungsten trioxide spraying by combining components such as a support frame, a lifting motor frame, a lifting motor, parallel guide rods, a bidirectional lead screw, a first lifting plate, a second lifting plate, multiple rotating motor frames, multiple tungsten trioxide containers, and combined valves within the tungsten trioxide containers. However, this device has a cumbersome and complex structure, high maintenance costs, and cannot meet the needs of handheld operation.

[0007] In summary, it is evident that existing technologies lack a handheld applicator that is simple in structure, easy to operate, and capable of precisely controlling the uniform coverage of tungsten trioxide. While some automated equipment addresses the instability of manual operation, it suffers from high costs and poor flexibility; existing manual methods, on the other hand, are inefficient, lack repeatability, and are prone to catalyst waste or inaccurate test results. Therefore, there is an urgent need for a handheld applicator specifically designed for coulometric sulfur analyzers to overcome these shortcomings and improve the accuracy and efficiency of detection. Utility Model Content

[0008] To overcome the shortcomings of existing technologies, this utility model provides a novel handheld spreader to standardize the operation of spreading tungsten trioxide catalyst in the combustion boat when using a coulometric sulfur analyzer to determine the sulfur content of coal samples. This avoids waste of tungsten trioxide, improves the efficiency of covering the thin layer of tungsten trioxide, and reduces the deviation of the test results. Therefore, the following technical solution is provided:

[0009] A handheld spreader for spreading tungsten trioxide catalyst in a combustion boat when determining the sulfur content of coal samples using a coulometric sulfur analyzer, comprising a feed tube, a cap, a spreader nozzle, and a distribution net, wherein:

[0010] The feed tube is a cylindrical component with a cap at the bottom. The cap is a conical or teardrop-shaped component with its large end face fitted onto the head of the feed tube. The nozzle is located on the small end face of the cap, and the interior of the nozzle is smoothly connected to the interior of the cap without any bends. The mesh is composed of a cylindrical frame and mesh material on the end face and is located at the head of the feed tube, with the outer periphery of the frame enclosed by the cap.

[0011] Optionally, the cap is connected to the external thread at the head of the feed tube via its internal thread, and the mesh is connected to the internal thread at the head of the feed tube via the external thread on its frame hoop.

[0012] Optionally, the mesh material is gauze or a sieve.

[0013] Optionally, the nozzle is a circular ring or a rectangular ring, and the inner diameter of the circular ring or the length of the inner long side of the rectangular ring is consistent with the width of the combustion boat.

[0014] Preferably, the bottom of the material tube is covered by a cap, which is connected to the bottom of the material tube by a sleeve or threaded connection.

[0015] Preferably, the outer wall of the material tube is also provided with an anti-slip mechanism.

[0016] Optionally, the anti-slip mechanism is an anti-slip pattern etched on the outer wall of the material tube, or a rubber / plastic sleeve with anti-slip patterns fitted onto the outer wall of the material tube.

[0017] Optionally, the handheld sprinkler provided by this utility model also includes a base, which is used to insert the bottom of the material tube or the cap.

[0018] Preferably, the base consists of a pneumatic suction cup and a sleeve disposed on the upper part of the pneumatic suction cup and matching the bottom of the material tube or the bottom of the support cap.

[0019] Optionally, the handheld sprinkler provided by this utility model also includes a nozzle cover, which is used to protect and close the sprinkling nozzle. Compared with the prior art, the beneficial effects and advancements of this utility model are as follows:

[0020] In the existing technology, when using a coulometric sulfur analyzer to determine the sulfur content of coal samples, the operation of spreading tungsten trioxide catalyst in the combustion boat mainly relies on manual methods. For example, the catalyst is scooped up with a sample spoon and then manually shaken or pulled to spread it. This method is cumbersome and it is difficult to control the uniformity of the catalyst, which can easily lead to uneven coverage of the coal sample surface, or even disturb the coal sample and change the sample quality, affecting the accuracy of the test results. At the same time, inaccurate force control can easily cause excessive tungsten trioxide to be spread or to be spread outside the combustion boat, resulting in reagent waste and reduced operating efficiency. In addition, some existing automated solutions, such as the utility model patent with authorization announcement number CN 204228659 U and the invention patent application with application number CN201510531491.7, although they achieve automated spreading, have complex structures, rely on motors and control systems, have high costs, and are not suitable for small laboratories or places that require flexible operation, and cannot meet the needs of handheld operation.

[0021] This invention effectively overcomes the shortcomings of existing technologies through structural innovation. It constructs a novel handheld tungsten trioxide dispenser using simple components including a feed tube, cap, nozzle, and uniform mesh. The uniform mesh, composed of a cylindrical frame and mesh material on its end face, ensures uniform dispersion of tungsten trioxide as it passes through, forming a thin, even layer within the combustion boat. This prevents localized over- or under-distribution, improving the accuracy and consistency of the detection. The nozzle's design matches the internal width of the combustion boat, allowing for precise control of the catalyst coverage during the dispensing process, reducing waste and preventing disturbance to the coal sample, thus ensuring sample quality stability. Compared to existing automated equipment, this invention features a simple structure, requires no motor or complex control system, has low manufacturing costs, and is easy to maintain. It is particularly suitable for small laboratories or frequently used environments, significantly improving operational convenience and economy while maintaining accuracy.

[0022] In addition, in the preferred embodiment of this utility model, the outer wall of the feed tube is also provided with an anti-slip mechanism, such as anti-slip texture or rubber sleeve, which enhances the stability and control during hand operation and further improves the accuracy of the spreading process; while the design of the base and nozzle sleeve makes it easier to store and protect the spreader and extends the service life of the spreader.

[0023] In summary, it can be seen that this utility model, by optimizing the components and connection method of the handheld spreader, achieves efficient, uniform, and controllable spreading of tungsten trioxide catalyst, effectively reducing reagent waste and detection deviation, improving the overall efficiency and reliability of laboratory testing, and providing a practical and economical solution for the auxiliary operation of coulometric sulfur analyzers. Attached Figure Description

[0024] To more clearly illustrate the technical solution of this utility model, the accompanying drawings used in the embodiments of this utility model will be briefly introduced below.

[0025] Obviously, the accompanying drawings described below are only some of the drawings of the present utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort, but these other drawings are also drawings required for the embodiments of the present utility model.

[0026] Figure 1 A three-dimensional structural diagram of a handheld sprinkler provided in an embodiment of this utility model;

[0027] Figure 2 A cross-sectional view of a handheld sprinkler provided in an embodiment of this utility model;

[0028] Figure 3A three-dimensional schematic diagram of an optimized handheld sprinkler provided for an embodiment of this utility model;

[0029] Figure 4 A three-dimensional structural diagram of another optimized handheld sprinkler provided for an embodiment of this utility model.

[0030] In the picture:

[0031] 10-Pipe, 20-Capping cap, 30-Spreading nozzle, 40-Net distribution, 41-Network material, 50-Holding cap, 60-Base, 70-Nose sleeve;

[0032] 100 - Burning Boat. Detailed Implementation

[0033] To make the objectives, technical solutions, beneficial effects, and significant advancements of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings provided for the embodiments of this utility model. Obviously, all the described embodiments are only some, not all, of the embodiments of this utility model, and based on the embodiments of this utility model, those skilled in the art can obtain more other embodiments without creative effort, but these possible embodiments all fall within the protection scope of this utility model.

[0034] It should be noted that:

[0035] The term "comprising" and any variations thereof in the specification and claims of this utility model are intended to cover a non-exclusive inclusion, that is, including not only a series of listed technical features and structural components, but also optionally technical features and structural components not listed, or optionally the connection relationships between such technical features and structural components.

[0036] What needs to be understood is:

[0037] In the description of the embodiments of this utility model, terms such as "upper," "lower," "head," and "bottom" are indicative of orientation or location, and are used only based on the orientation or positional relationship shown in the accompanying drawings of the embodiments of this utility model. They are for the convenience of describing the embodiments of this utility model and simplifying the description, and are not intended to indicate or imply that the device or element must have a specific orientation, specific orientation structure, or operation. Therefore, they should not be construed as limitations on this utility model.

[0038] In this utility model, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed setting or connection, a detachable setting or connection, a movable connection, or an integral connection; that is, they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two structural elements or the interaction between two elements. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] It should also be noted that the following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0040] The technical solution of this utility model will now be described in detail with reference to specific embodiments. Example 1

[0041] This embodiment provides a basic handheld spreader for spreading tungsten trioxide catalyst in a combustion boat when using a coulometric sulfur analyzer to determine the sulfur content of coal samples.

[0042] like Figure 1 A three-dimensional structural diagram of a handheld sprinkler provided for an embodiment of this utility model. Figure 2 A cross-sectional view of a handheld sprinkler provided in this embodiment of the present invention is shown below:

[0043] A handheld sprinkler includes a feed tube 10, a cap 20, a sprinkling nozzle 30, and a mesh 40. The feed tube 10 is a transparent plastic cylinder with a bottom cap, used to hold tungsten trioxide catalyst. The mesh 40 is composed of a metal cylindrical frame and a stainless steel mesh 41 tightened and fixed at one end, and is fixed inside the feed tube 10 by matching the external thread on the frame with the internal thread at the head of the feed tube 10. The cap 20 is a conical component made of ABS engineering plastic, with an internal thread on its large end face, which matches the external thread at the head of the feed tube 10, thereby enclosing the outer periphery of the frame of the mesh 40. The sprinkling nozzle 30 is a rectangular ring fixed to the small end face of the cap 20, made of a thin metal sheet, and its internal length matches the internal width of a standard combustion boat 100.

[0044] The handheld sprinkler provided in this embodiment, through the setting of the uniform mesh, enables tungsten trioxide to be effectively dispersed when flowing through the sieve under the action of gravity, thereby overcoming the defect of uneven distribution when manually sprinkling tungsten trioxide with a sample spoon, ensuring the formation of a uniform catalyst thin layer on the surface of the coal sample, and significantly improving the accuracy of the detection results.

[0045] The size of the spray nozzle is precisely matched with the combustion boat, which allows for strict control of the coverage area during the spraying operation. This effectively prevents the catalyst from being wasted by spilling outside the boat and avoids the risk of the tool touching the coal sample and causing changes in sample quality.

[0046] As can be seen, the structure of the entire sprinkler is extremely simple, consisting of only four core components connected by threads. It requires no electric components, has low manufacturing costs, and is particularly suitable for widespread application in various laboratories. It represents a technological advancement that achieves efficient, convenient, and precise operation at low cost. Example 2

[0047] Based on Example 1, this example provides an optimized handheld sprinkler.

[0048] like Figure 3 A three-dimensional schematic diagram of an optimized handheld sprinkler provided for embodiments of this utility model. Figure 4 A three-dimensional structural diagram of another optimized handheld sprinkler provided for an embodiment of this utility model is shown:

[0049] An optimized handheld dispenser has a removable cap 50 at the bottom of its feed tube 10 via a threaded connection, which facilitates the addition of tungsten trioxide catalyst or the cleaning of residual catalyst inside the feed tube, and also allows for easy and thorough cleaning of the feed tube 10.

[0050] On the outer wall of the material tube 10, a silicone rubber sleeve with raised anti-slip texture is also fitted as an anti-slip mechanism to enhance the friction and operational stability when holding the hand.

[0051] In addition, this embodiment is also equipped with a base 60, which consists of a pneumatic suction cup and a plastic sleeve fixed thereon. When in use, the bottom of the material tube or the cap is inserted into the sleeve, so that the sprinkler can be stably and upright placed on the workbench.

[0052] As can be seen, this embodiment, while achieving uniform and precise application, further enhances the practicality, safety, and user-friendly design of the device, including:

[0053] The detachable bottom design facilitates maintenance, ensures the cleanliness of the dispenser, and prevents cross-contamination between different batches of samples;

[0054] The addition of the anti-slip mechanism greatly improves the operating feel, allowing for stable operation even when busy or with slightly sweaty hands, further reducing operational errors caused by slipping and improving the accuracy of the scattering action.

[0055] In addition, the introduction of a dedicated base allows the sprinkler to be stored safely and stably when not in use, avoiding potential contamination or damage caused by direct contact between the nozzle and the work surface, and also making the operation process more orderly.

[0056] These improvements demonstrate the technological advancement from implementing single functions to optimizing the overall user experience. Example 3

[0057] Based on Embodiments 1 and 2, this embodiment further provides another optimized handheld sprinkler.

[0058] As a preferred embodiment of this utility model, this embodiment combines the features of the aforementioned embodiments 1 and 2, and further improves and enhances them, including: the bottom of the feed tube 10 is connected to an aluminum alloy support cap 50 by a thread; the outer wall of the feed tube 10 is etched with a spiral anti-slip texture; the uniform mesh 40 uses high-mesh nylon gauze as the mesh material 41; the sealing cap 20 adopts a teardrop-shaped streamlined design; the nozzle 30 is a stainless steel ring with an inner diameter consistent with the width of a commonly used combustion boat 100; in particular, this embodiment is also equipped with a flexible nozzle sleeve 70 made of silicone. When the spreader is not in use, the nozzle sleeve 70 can be put on the nozzle 30, thereby effectively preventing external impurities from entering and clogging the nozzle and uniform mesh, and also preventing the catalyst in the container from getting damp.

[0059] As can be seen, this embodiment represents a comprehensive optimization of the present invention in terms of practicality, durability, and maintainability, wherein:

[0060] Using high-mesh nylon gauze as the dispersion medium ensures uniform dispersion while providing a finer dispersion effect;

[0061] The etched anti-slip texture on the tube provides a permanent anti-slip solution, eliminating concerns about the aging of additional components;

[0062] The design of the flexible protective sleeve is an important technological advancement. It not only provides physical protection, but more importantly, by sealing the outlet, it effectively maintains a dry storage environment for the catalyst. This is crucial for maintaining the catalytic activity of hygroscopic tungsten trioxide, thereby indirectly ensuring the reliability of the test results.

[0063] In addition, this design extends the lifespan of the sprinkler, reduces long-term maintenance costs, and makes the entire solution more complete and reliable.

[0064] In conclusion, it can be seen that:

[0065] This utility model provides a novel handheld spreader specifically for coulometric sulfur analyzers, aiming to solve the problems of cumbersome operation, poor uniformity, and easy waste in the manual spreading of tungsten trioxide catalyst in the prior art, as well as the complex structure and high cost of automated equipment. The core structure of the spreader includes a feed tube for holding the catalyst, a cap connected to the feed tube, a spreading nozzle set at the small end of the cap, and a uniform mesh located at the head of the feed tube for dispersing. The screening effect of the uniform mesh ensures that the catalyst flows out uniformly. Combined with the spreading nozzle that is precisely matched to the width of the combustion boat, the purpose of quickly and accurately covering the surface of the coal sample with a uniform thin layer of tungsten trioxide is achieved.

[0066] Compared to existing technologies, the novel handheld sprinkler provided by this invention, through its extremely simplified mechanical structure, perfectly balances operational precision and convenience without requiring electricity or a complex control system. It effectively overcomes the instability of manual operation and the economic barriers of automated equipment. Its direct effect is a significant improvement in the uniformity and consistency of catalyst coverage, thereby reducing deviations in test results caused by uneven coverage and improving the accuracy of test data. Simultaneously, precise control of the sprinkling range greatly avoids waste caused by catalyst spillage outside the boat, reducing experimental costs. Furthermore, its handheld design provides operational flexibility unmatched by automated equipment. Coupled with user-friendly designs such as anti-slip mechanisms, a detachable base, and a protective nozzle, it further optimizes the user experience, making this device an ideal laboratory auxiliary tool that is simple in structure, low in cost, easy to maintain, and highly versatile. It is particularly suitable for widespread application in laboratories of all sizes, possessing substantial characteristics and significant progress compared to existing technologies, and therefore has great promotional and application value.

[0067] In the description process of the above instruction manual:

[0068] The terms "this embodiment," "this utility model embodiment," "as shown," "further," etc., refer to specific features, structures, materials, or characteristics described in the embodiment that are included in at least one embodiment of the present utility model. In this specification, the illustrative expressions of the above terms are not necessarily directed at the same embodiment. Moreover, the specific features, structures, materials, or characteristics described can be combined or combined in a suitable manner in any one or more embodiments. Furthermore, without creating contradictions, those skilled in the art can combine or combine the different embodiments and features of the different embodiments described in this specification.

[0069] Finally, it should be noted that:

[0070] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it;

[0071] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions described in the embodiments of the present invention. Non-essential improvements, adjustments or substitutions made by those skilled in the art based on the contents described in this specification are all within the scope of protection claimed by the present invention.

Claims

1. A handheld spreader for spreading tungsten trioxide catalyst in a combustion boat when determining the sulfur content of coal samples using a coulometric sulfur analyzer, characterized in that, Includes feed pipe, sealing cap, spray nozzle, and uniform screen, among which: The feed tube is a cylindrical component with a cap at the bottom. The cap is a conical or teardrop-shaped component with its large end face fitted onto the head of the feed tube. The nozzle is located on the small end face of the cap, and the interior of the nozzle is smoothly connected to the interior of the cap without any bends. The mesh is composed of a cylindrical frame and mesh material on the end face and is located at the head of the feed tube, with the outer periphery of the frame enclosed by the cap.

2. The handheld sprinkler as described in claim 1, characterized in that, The cap is connected to the external thread at the head of the feed tube via its internal thread, and the mesh is connected to the internal thread at the head of the feed tube via the external thread on its frame hoop.

3. The handheld sprinkler as described in claim 1, characterized in that, The mesh material is gauze or sieve.

4. The handheld sprinkler as described in claim 1, characterized in that, The nozzle is a circular or rectangular ring, and the inner diameter of the circular ring or the length of the inner long side of the rectangular ring is the same as the width of the combustion boat.

5. The handheld sprinkler as described in claim 1, characterized in that, The bottom of the material tube is covered by a cap, which is connected to the bottom of the material tube by a sleeve or threaded connection.

6. The handheld sprinkler as described in claim 1, characterized in that, The outer wall of the material pipe is also equipped with an anti-slip mechanism.

7. The handheld sprinkler as described in claim 6, characterized in that, The anti-slip mechanism is an anti-slip pattern etched on the outer wall of the material tube, or a rubber / plastic sleeve with anti-slip patterns fitted onto the outer wall of the material tube.

8. The handheld sprinkler as described in claim 5, characterized in that, It also includes a base for inserting into the bottom of the material tube or the support cap.

9. The handheld sprinkler as described in claim 8, characterized in that, The base consists of a pneumatic suction cup and a sleeve located on the upper part of the pneumatic suction cup and matching the bottom of the material tube or the bottom of the support cap.

10. The handheld sprinkler as described in claim 1, characterized in that, It also includes a nozzle cover, which is used to protect and seal the sprinkling nozzle.

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