A flat-end pulverized coal sampling gun powder leakage prevention device

Abstract

The utility model relates to the technical field of coal powder sampling, disclose a flat -end coal powder sampling gun powder leakage prevention device, include: elastic sealing body and protective cover, elastic sealing body is equipped with first through -hole for sampling gun to pass through, its aperture corresponds with the outside diameter of sampling gun, makes elastic sealing body when being equipped with in sampling gun pipe outside, can be pasted with sampling gun, protective cover is horn -shaped, has the first opening of sampling mouth direction and the second opening of far from sampling mouth, first opening is greater than the second opening, elastic sealing body is detachably arranged in the protective cover, the axis line extension line of first through -hole is through first opening and second opening, when sampling, sampling gun is through first through -hole, through holding the protective cover and push to sampling mouth to extrude elastic sealing body, make its block the gap between sampling mouth and sampling gun. The device has good universality and sealing property, through extruding elastic sealing body makes it and sampling mouth close adhesion, effectively prevent coal powder leakage.

Description

Technical Field

[0001] This utility model relates to the field of coal powder sampling technology, specifically to a coal powder sampling gun anti-leakage device. Background Technology

[0002] Coal mills are crucial auxiliary equipment in power plant boilers. Their safety and economy are directly related to the fineness of the pulverized coal, which in turn directly affects boiler combustion. Therefore, it is necessary to periodically take pulverized coal samples for fineness analysis to monitor boiler combustion. Flat-head pulverized coal sampling guns utilize the isokinetic sampling principle, offering high sampling accuracy and are widely used for pulverized coal sampling in coal pulverized coal pipelines of thermal power plants.

[0003] During the sampling process, the sampling personnel hold a flat-tipped coal powder sampling gun and insert it into the sampling port of the coal powder pipeline to take a sample. Generally speaking, the design size of the sampling port is often larger than the diameter of the sampling gun tube to facilitate the insertion of the sampling gun into the sampling port. However, due to the poor sealing at the sampling port, the positive pressure coal powder in the coal powder pipeline is often sprayed out, which affects the test. Sometimes the sampling personnel will use waste rags or gloves to seal it. However, because the material and shape of the waste rags or gloves cannot perfectly match the sampling port, the sealing is not tight and coal powder leakage is easy to occur.

[0004] Coal dust leaks not only create a harsh environment at the sampling site, affecting the visibility and efficiency of sampling personnel, but also potentially cause safety accidents. Furthermore, the leaked coal dust will further pollute the surrounding environment, increasing the workload of subsequent cleanup. Utility Model Content

[0005] The purpose of this utility model is to provide a leak-proof device for a flat-head coal powder sampling gun, so as to solve the problem of poor sealing at the sampling port when sampling coal powder in the above-mentioned background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A leak-proof device for a flat-head coal powder sampling gun includes:

[0008] An elastic sealing body is provided with a first through hole for the sampling gun to pass through. The diameter of the first through hole corresponds to the outer diameter of the sampling gun, so that when the elastic sealing body is sleeved on the outside of the sampling gun barrel, it can fit tightly with the sampling gun.

[0009] The protective cover is funnel-shaped, having a first opening facing the sampling port and a second opening away from the sampling port, the first opening being larger than the second opening. An elastic sealing body is detachably disposed within the protective cover. The extended axis of the first through hole passes through both the first and second openings. During sampling, the sampling gun passes through the first through hole. By holding the protective cover and pushing it towards the sampling port, the elastic sealing body is compressed, sealing the gap between the sampling port and the sampling gun. This device features a compact overall design, with the elastic sealing body detachably installed within the protective cover. Adding this device to the sampling gun facilitates convenient and rapid operation, achieving excellent powder leakage prevention, effectively improving the working environment for sampling personnel and reducing environmental pollution.

[0010] Furthermore, the elastic sealing body has a large-diameter end, a small-diameter end, and a tapered elastic surface connecting the large-diameter end and the small-diameter end. The diameter of the tapered elastic surface gradually decreases from the large-diameter end to the small-diameter end. The diameter of the large-diameter end of the elastic sealing body is 100mm to 140mm, the diameter of the small-diameter end is 32mm to 40mm, and the height of the elastic sealing body is 100mm to 300mm. The shape of the elastic sealing body is also approximately trumpet-shaped, which facilitates fitting into the inner cavity of the protective cover. The elastic sealing body has a certain thickness, enabling it to absorb a certain amount of coal dust and prevent coal dust leakage along the second opening.

[0011] Furthermore, the inner wall of the protective cover has a limiting structure to prevent the elastic seal inside the protective cover from shifting.

[0012] Furthermore, the protective cover includes a limiting part and a gripping part connected together. The limiting part has a first opening at its end away from the gripping part, and the gripping part has a second opening at its end away from the limiting part. The inner wall of the limiting part has a limiting structure. In use, the sampling personnel grasp the gripping part and squeeze the elastic sealing body towards the sampling port, causing the elastic sealing body to deform elastically, effectively sealing the gap between the sampling port and the sampling gun, preventing coal powder leakage. Simultaneously, the limiting structure on the inner wall of the limiting part prevents the elastic sealing body from shifting under pressure, effectively improving the sealing stability.

[0013] Furthermore, the limiting part has a large-diameter end, a small-diameter end, and a tapered limiting surface connecting the large-diameter end and the small-diameter end. The tapered limiting surface includes multiple connected limiting grooves, the inner diameter of which decreases sequentially from the large-diameter end to the small-diameter end. The large-diameter end of the limiting part is provided with a first opening, and the small-diameter end of the limiting part is connected to the gripping part. The elastic sealing body can be stably positioned inside the protective cover by the limitation of the limiting grooves.

[0014] Furthermore, the gripping part has a large-diameter end, a small-diameter end, and a tapered transition surface connecting the large-diameter end and the small-diameter end. The large-diameter end of the gripping part is connected to the limiting part, and the small-diameter end of the gripping part is provided with a second opening. This design facilitates the sampling personnel's grip on the protective cover and further restricts the elastic seal, preventing it from slipping out of the protective cover through the second opening.

[0015] Furthermore, it also includes an extension tube having a second through hole for the sampling gun to pass through, the extension tube being connected to a second opening of the protective cover. The inner diameter of the extension tube is equal to the inner diameter of the second opening, extending the second opening outward to form a transition section for easy gripping of the protective cover. Simultaneously, it guides the insertion of the sampling gun, facilitating better passage of the sampling gun through the protective cover and the elastic seal.

[0016] Furthermore, it also includes a powder-proof collar, the center of which has a third through hole for the sampling gun to pass through. The diameter of the third through hole corresponds to the outer diameter of the sampling gun, so that the powder-proof collar can fit tightly against the sampling gun when it is fitted onto the outside of the sampling gun barrel due to its own elasticity. The powder-proof collar should contact the second opening during sampling. The powder-proof collar achieves its fit with the sampling gun through its third through hole. The outer diameter of the powder-proof collar should be slightly larger than the outer diameter of the second opening or the outer diameter of the extension tube (if any). By tightly fitting the annular surface of the powder-proof collar against the second opening, it blocks fly ash that may fly out from the gap between the second opening and the outside of the sampling gun barrel. Simultaneously, the powder-proof collar also serves as a marker for the length of the sampling gun pull-out, providing a positioning reference when the sampling gun is pulled out in stages.

[0017] Furthermore, it also includes a connecting chain, one end of which is connected to the second opening, and the other end of which is connected to a powder-proof collar. The connecting chain has a buckle that allows it to adjust its length. With this configuration, when the sampling gun is pulled, the barrel moves together with the powder-proof collar, and the protective cover and the powder-proof collar are connected by the connecting chain. In practical use: before sampling, the length of the connecting chain is set using the buckle. When pulling the sampling gun outwards, the connecting chain is straightened to ensure the sampling gun is in position. Then, the powder-proof collar is pushed back into the second opening for reference during the next pull, ensuring that the sampling gun is pulled out the same length each time.

[0018] Furthermore, the connecting chain is preferably a stainless steel ball chain, and the buckle is a matching buckle for the stainless steel ball chain.

[0019] Furthermore, the inner diameters of the first and third through holes are 22mm to 25mm. This inner diameter range is designed to ensure a tight fit between the elastic sealing body and the anti-leakage ring and the sampling gun. The inner diameters of the extension tube and the second opening are equal, both 26mm to 28mm, slightly larger than the outer diameter of the sampling gun to facilitate the insertion of the sampling gun into the device.

[0020] Furthermore, the elastic sealing body is made of sponge or rubber, the limiting part is made of elastic material, and the gripping part is made of rigid material. These features simplify material sourcing and manufacturing, facilitating the widespread application of this device.

[0021] This invention has the following advantages over the prior art:

[0022] 1. This utility model discloses a leak-proof device for a flat-head coal powder sampling gun, comprising a protective cover and an elastically deformable sealing body. The elastic sealing body is detachably installed inside the protective cover and has a first through hole for the sampling gun to pass through. The protective cover has a first opening and a second opening. In use, the elastic sealing body can be fitted onto the outer circumference of the sampling gun barrel through the first through hole, and the protective cover is fitted onto the outer circumference of the elastic sealing body. By holding the protective cover and squeezing the elastic sealing body towards the sampling port, the elastic sealing body is tightly fitted to the sampling port, forming an effective sealing barrier to effectively prevent coal powder leakage, improve the sampling environment, and enhance the safety, accuracy, and efficiency of sampling work. Simultaneously, the elastic sealing body can elastically deform according to the actual shape and size of the sampling port, allowing it to adapt to sampling ports of different diameters and shapes to form a reliable seal, giving the device good versatility and adaptability. Sampling personnel only need to carry this leak-proof device to achieve rapid and accurate sampling in various sampling scenarios, fully utilizing the advantages of the sampling gun. Overall, compared to existing technologies, this invention effectively improves the working environment and has good adaptability. While increasing the efficiency and quality of sampling work, it avoids occupational hazards caused by long-term exposure to dusty environments and also prevents environmental pollution. Attached Figure Description

[0023] Figure 1 This is an exploded view of the anti-leakage device for the flat-head coal powder sampling gun in Embodiment 1 of this utility model;

[0024] Figure 2 This is a schematic diagram of the usage status of the anti-leakage device for the flat-head coal powder sampling gun in Embodiment 1 of this utility model (without extension tube, anti-leakage collar and connecting chain);

[0025] Figure 3 A schematic diagram of the usage state of the anti-leakage device for the flat-head coal powder sampling gun in Embodiment 1 of this utility model (the anti-leakage collar is not tightly attached to the second opening or extension tube in the figure to distinguish the boundaries of the components).

[0026] Figure 4 This is a schematic diagram of the usage status of the anti-leakage device for the flat-head coal powder sampling gun in Embodiment 2 of this utility model (the anti-leakage collar is not tightly fitted to the second opening or extension tube in the figure to distinguish the boundaries of the components).

[0027] Figure 5 This is a schematic diagram of the usage status of the anti-leakage device for the flat-head coal powder sampling gun in Embodiment 3 of this utility model (the anti-leakage collar is not tightly fitted to the second opening or extension tube in the figure to distinguish the boundaries of the components).

[0028] Figure 6 This is a schematic diagram of the usage state of the anti-leakage device for the flat-head coal powder sampling gun in Embodiment 4 of this utility model (the anti-leakage collar is not tightly fitted to the second opening or extension tube in the figure to distinguish the component boundaries).

[0029] In the diagram: 1. Elastic sealing body; 101. First through hole; 102. Conical elastic surface; 2. Protective cover; 201. First opening; 202. Second opening; 203. Limiting part; 204. Grip part; 205. Limiting groove; 206. Conical transition surface; 3. Extension tube; 301. Second through hole; 4. Anti-leakage collar; 401. Third through hole; 5. Connecting chain; 501. Buckle; 6. Sampling gun; 601. Sampling gun handheld area; 7. Sampling port; 8. Coal powder pipeline; 9. Valve. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] It should be noted that in the description of this utility model, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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.

[0032] Furthermore, it should be understood that, for ease of description, the dimensions of the various components shown in the accompanying drawings are not drawn to actual scale.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined or described in one figure, it will not need to be further discussed and described in the description of the subsequent figures.

[0034] Example 1:

[0035] like Figures 1 to 3 As shown, this utility model provides a leak-proof device for a flat-head coal powder sampling gun. Figure 2 The device includes an elastic sealing body 1 and a protective cover 2. The elastic sealing body 1 has a first through hole 101 for a sampling gun 6 to pass through. The diameter of the first through hole 101 corresponds to the outer diameter of the sampling gun 6, so that when the elastic sealing body 1 is fitted over the barrel of the sampling gun 6, it can fit tightly against the sampling gun 6. The elastic sealing body 1 can elastically deform under pressure, thereby blocking the sampling port 7. The protective cover 2 is funnel-shaped and has a first opening 201 facing the sampling port 7 and a second opening 202 away from the sampling port 7. The first opening 201 is larger than the second opening 202. The elastic sealing body 1 is detachably installed inside the protective cover 2 for easy maintenance and replacement. The extended axis of the first through hole 101 passes through the first opening 201 and the second opening 202. During sampling, the elastic sealing body 1 and the protective cover 2 are sequentially fitted onto the outer periphery of the sampling gun 6. By holding the protective cover 2 and pushing it toward the sampling port, the elastic sealing body 1 is squeezed, causing it to deform elastically and thus sealing the gap between the sampling port and the sampling gun. The protective cover 2 provides support for the elastic sealing body 1. At the same time, it can also block a small amount of coal dust that passes through the elastic sealing body 1, confining the coal dust inside the protective cover 2 and preventing leakage.

[0036] This device features a sophisticated overall design. When installed on the sampling gun 6, it offers convenient and rapid operation, achieving excellent powder leakage prevention. This effectively improves the working environment for sampling personnel and reduces environmental pollution. The elastic sealing body 1, on the side in contact with the sampling port 7, can elastically deform according to the actual shape and size of the sampling port 7, forming a reliable seal. This allows it to adapt to sampling ports of different diameters and shapes. This gives the device excellent versatility and adaptability. Sampling personnel only need to carry this powder leakage prevention device to achieve rapid and accurate sampling in various sampling scenarios, fully utilizing the advantages of the sampling gun and improving the efficiency and quality of sampling work.

[0037] In this embodiment, the elastic sealing body 1 has a large-diameter end, a small-diameter end, and a conical elastic surface 102 connecting the large-diameter end and the small-diameter end. The diameter of the conical elastic surface 102 gradually decreases from the large-diameter end to the small-diameter end. The diameter of the large-diameter end of the elastic sealing body is 100mm to 140mm, the diameter of the small-diameter end is 32mm to 40mm, and the height of the elastic sealing body is 100mm to 300mm. The elastic sealing body is approximately trumpet-shaped, and its overall size is slightly larger than the inner cavity of the protective cover 2, allowing it to fit tightly against the protective cover. The elastic sealing body 1 has a certain thickness, enabling it to absorb a certain amount of coal dust and prevent coal dust leakage along the second opening 202. The elastic sealing body 1 is made of sponge or rubber, the limiting part 203 is made of elastic material, and the gripping part 204 is made of hard material. This design simplifies material sourcing and manufacturing, facilitating the widespread application of this device. This lightweight device does not add unnecessary lifting burdens to sampling personnel, reducing unnecessary workload and improving sampling efficiency. In terms of safety and the environment, using this device significantly reduces coal dust splashing and generation during sampling, effectively improving the workplace environment and preventing occupational hazards caused by prolonged exposure to dusty environments. From a commercial perspective, this not only helps improve the work experience of sampling personnel but also reduces the risk of errors due to fatigue, indirectly saving labor and time costs.

[0038] In this embodiment, the inner wall of the protective cover 2 has a limiting structure to prevent the elastic sealing body 1 inside the protective cover 2 from shifting. Specifically, the protective cover 2 includes a limiting part 203 and a gripping part 204 connected to each other. The end of the limiting part 203 away from the gripping part 204 is provided with a first opening 201, and the end of the gripping part 204 away from the limiting part 203 is provided with a second opening 202. The inner wall of the limiting part 203 has a limiting structure. In use, the sampling personnel grasp the gripping part 204 and squeeze the elastic sealing body 1 towards the sampling port 7, causing the part of the elastic sealing body 1 in contact with the sampling port to undergo elastic deformation, effectively sealing the gap between the sampling port 7 and the sampling gun 6, preventing coal powder leakage. At the same time, the inner wall of the limiting part 203 has a limiting structure, which can prevent the elastic sealing body 1 from shifting under pressure, effectively improving the sealing stability.

[0039] In this embodiment, the limiting part 203 has a large-diameter end, a small-diameter end, and a tapered limiting surface connecting the large-diameter end and the small-diameter end. The tapered limiting surface includes a plurality of connected limiting grooves 205, the inner diameter of which decreases sequentially from the large-diameter end to the small-diameter end. The large-diameter end of the limiting part 203 is provided with a first opening 201, and the small-diameter end of the limiting part 203 is connected to the gripping part 204. The elastic sealing body is stably positioned within the protective cover due to the constraint of the limiting grooves. The structure of the limiting part can be referenced from the front leather sleeve of a vacuum toilet plunger.

[0040] In this embodiment, the gripping part 204 has a large-diameter end, a small-diameter end, and a tapered transition surface 206 connecting the large-diameter end and the small-diameter end. The large-diameter end of the gripping part 204 is connected to the limiting part 203, and the small-diameter end of the gripping part 204 is provided with a second opening 202. The tapered transition surface 206 of the protective cover 2 facilitates the gripping of the sampling personnel and can further restrict the elastic sealing body 1, preventing it from falling out of the protective cover 2 from the second opening 202.

[0041] like Figure 3 As shown, an extension tube 3 can also be provided on the outside of the second opening 202. The extension tube 3 has a second through hole 301 for the sampling gun 5 to pass through. The inner diameter of the extension tube 3 is equal to the inner diameter of the second opening 202, and it is used to extend the second opening 202 outward to form a transition section for easy gripping of the protective cover 2. At the same time, it provides a guiding effect for the insertion of the sampling gun, making it easier for the sampling gun to pass through the protective cover and the elastic seal. The inner diameters of the extension tube and the second opening are equal, both 26mm to 28mm, slightly larger than the outer diameter of the sampling gun to facilitate the insertion of the sampling gun into the device.

[0042] A leak-proof powder collar 4 can also be provided. The center of the leak-proof powder collar 4 has a third through hole 401 through which the sampling gun 6 passes. The diameter of the third through hole corresponds to and is slightly smaller than the outer diameter of the sampling gun 6, so that when the leak-proof powder collar 4 is fitted onto the sampling gun 6, it can fit tightly against the outside of the sampling gun barrel due to its own elasticity. Furthermore, during sampling, the leak-proof powder collar 4 should contact the second opening 202. The leak-proof powder collar 4 achieves its fit with the sampling gun 6 through its own third through hole 401. The outer diameter of the anti-leakage sleeve should be slightly larger than the outer diameter of the second opening 202 or the outer diameter of the extension tube (if any). During the process of pushing the sampling gun 6 into the sampling port 7, the gun rod drives the anti-leakage sleeve 4 to fit against the second opening 202. This, through the annular surface of the anti-leakage sleeve, blocks any trace amounts of fly ash that might escape from the gap between the second opening 202 and the outside of the sampling gun tube, further enhancing the anti-leakage effect and improving the quality and safety of the sampling environment. Simultaneously, the anti-leakage sleeve 4 can also serve as a length indicator for the sampling gun pull-out, providing a positioning reference when the sampling gun 6 is pulled out in stages.

[0043] Specifically, a connecting chain 5 can be provided. One end of the connecting chain 5 is connected to the second opening 202, and the other end of the connecting chain 5 is inserted into the hole of the anti-leakage powder collar 4 and tightly connected to the anti-leakage powder collar 4 with adhesive. The connecting chain 5 has a buckle 501 that can adjust its length. With the above configuration, when the sampling gun 6 is pulled, the barrel drives the anti-leakage powder collar 4 to move together by relying on its static friction against the inner diameter of the anti-leakage powder collar. The protective cover 2 and the anti-leakage powder collar 4 are connected by the connecting chain 5. In actual use: before sampling, the length of the connecting chain 5 is set by the buckle 501. When pulling out the sampling gun 6, the connecting chain 5 is straightened to determine that the sampling gun 6 has moved into place. Then, the anti-leakage powder collar 4 is pushed back into the second opening for reference when pulling out next time, so as to ensure that the sampling gun is pulled out to the same length each time.

[0044] Specifically, the inner diameters of the first through hole 101 and the third through hole 401 are 22mm to 25mm. This inner diameter range is designed to ensure that the elastic sealing body 1 and the anti-leakage powder collar 4 can fit tightly with the sampling gun 5.

[0045] In another embodiment, magnetic material is embedded in the edge or interior of the elastic seal 1. Magnetic attraction allows the elastic seal 1 to better conform to the metal sampling port 7, enhancing sealing performance. The magnetic material can be a neodymium iron boron magnet, possessing strong magnetism; the elastic seal 1 can also be made of silicone, rubber, or other materials. The elastic seal 1 with embedded magnetic material is particularly suitable for metal sampling ports, effectively reducing coal dust leakage while facilitating installation and disassembly. Magnetic adsorption allows for quick positioning and fixation of the sealing head.

[0046] In another embodiment, the shape of the elastic seal is not specifically limited, as long as it can be confined within the protective cover and its ends can form a contact surface with the sampling port.

[0047] In practical use:

[0048] 1. Fabrication of elastic sealing body 1:

[0049] Material selection: Dense and rigid foam sponge, sponge, rubber, or other soft, heat-resistant materials with a certain degree of conformity are recommended. The elastic sealing body 1 has a certain degree of flexibility and elasticity, which can ensure a tight fit with the sampling port and sampling gun during the sampling process, while adapting to high-temperature environments and preventing coal dust leakage.

[0050] Shape and Structure: The overall shape is formed by machining and modifying a regular cone. Figure 1 and Figure 2Its circular shape is clearly visible. An internal cylindrical groove of φ24mm±1mm is carved out from top to bottom along the central axis of the cone, allowing a φ25mm sampling gun to pass through and fit snugly. The cone's top is tipped, transforming it into a truncated cone. The minimum distance between the outer edge of the truncated cone's top surface and the inner ring is no less than φ10mm to prevent reduced durability due to excessively thin material. Before processing, the elastic seal 1 should ideally be a cone, with its planed surface forming an isosceles triangle. The vertex angle should ideally be 35°±5°, and the height should ideally be between 100mm and 300mm. The maximum distance between any two points on the outer edge of the base should ideally be 120mm±20mm. The final seal should have a suitable overall shape and be cut to standard specifications.

[0051] Function and Use: The elastic seal 1 is not bonded to other components, making it easy to replace and usable from both ends. When there is no obstruction near the sampling port, the elastic seal acts as... Figure 2 As shown, place the sample inside the protective cover, and use the large-diameter end of the elastic sealing body to fit against the sampling port. If the valve wrench at the sampling port extends beyond the port after opening, or if there is a foreign object obstructing the front of the sampling port, preventing the large-diameter end from fitting against the port, refer to... Figure 4 The elastic sealing body can be flipped so that the large-diameter end's large circular surface is fixed to the limiting groove at the first opening end of the protective cover, while the small-diameter end's small circular surface extends into the sampling port. The small circular surface or conical elastic surface fits against the sampling port to prevent powder leakage and facilitate sampling (see reference). Figure 4 The elastic seal in this device can be used interchangeably at both ends. The protective cover is equipped with multiple limiting grooves with progressively smaller inner diameters, which can provide good limiting support for the elastic seal whether it is the large-diameter end or the small-diameter end that extends into the protective cover.

[0052] 2. Construction of Protective Shield 2:

[0053] Material selection: The protective cover includes a limiting part 203 and a gripping part 204. The limiting part 203 is similar to the leather cover at the front of a vacuum toilet plunger. It is soft and elastic. When the elastic sealing body is in contact with the sampling port, it can play a buffering and sealing role. At the same time, it can appropriately block a small amount of fly ash generated during docking.

[0054] The limiting groove in the limiting part 203 fixes the elastic seal body to the protective cover and provides support and positioning for the elastic seal body, ensuring that the elastic seal body will not shift during use.

[0055] The grip part 204 is made of lightweight plastic, which is lightweight yet has a certain strength. It can also be a stainless steel conical sleeve or other materials that meet the requirements.

[0056] Function and Use: The limiting part 203 and the gripping part 204 are bonded together as a single unit. The gripping part 204 also fits into the elastic sealing body, while simultaneously isolating the elastic sealing body from the outside environment, making it convenient for workers to grasp. Figure 2 As shown, during the sampling process, the operator can grasp the grip with one hand and squeeze it towards the sampling port, while holding the sampling gun's handheld area 601 with the other hand and moving the sampling gun 6 to perform constant-speed sampling. The cone-shaped grip in the figure is designed to facilitate the operator's operation and force application.

[0057] 3. Fabrication of the anti-leakage powder collar 4:

[0058] Material selection: It should be a flexible sponge material with a certain thickness. Its inner diameter ranges from 22mm to 25mm, and its outer diameter should be slightly larger than the outer diameter of the second opening 202 or the outer diameter of the extension tube 3, approximately 28mm to 32mm.

[0059] Function and Use: Used to block trace amounts of fly ash that may escape from the gap between the second opening and the outside of the sampling gun barrel. It can also be used as a marker for the pull-out length of the sampling gun. During use, ensuring the anti-leakage collar is tightly fitted to the second outlet or the end of the extension tube (if any) can further reduce the environmental impact of coal dust leakage. The connecting chain also provides a reference for the pull-out distance during sampling operations.

[0060] Creating Link 5:

[0061] Material selection: Common and sturdy wire chains that can be tied are recommended, such as fishing lines and movable slings. Stainless steel ball chains are preferred. Stainless steel ball chains 5 and adjustable buckles 501 can be purchased from the market.

[0062] Function and Use: The stainless steel ball chain 5 passes through the small hole drilled inside the anti-leakage powder collar 4. After the melted glue is poured into the hole and solidifies, the stainless steel ball chain 5 is tightly connected to the anti-leakage powder collar 4. The other end of the ball chain passes through the second opening or the small hole reserved at the lower end of the extension tube and connects to the protective cover 2. The length of the entire chain can be adjusted by fastening the buckle 501 at different positions on the ball chain.

[0063] Before sampling, the length of the connecting chain 5 is set by the snap fastener 501. When pulling out the sampling gun 6, the connecting chain 5 is straightened to ensure that the sampling gun 6 is in place. Then, the anti-leakage ring 4 is pushed back to the end of the second opening or the extension opening for reference when pulling out next time, so as to ensure that the sampling gun is pulled out to the same length each time, thus ensuring equidistant sampling.

[0064] Its overall structure and the connection relationship of each component are as follows: Figure 3As shown: all components are tightly connected, some components are detachable and replaceable, the elastic seal is not stuck to the protective cover, the limiting and gripping parts of the protective cover are firmly bonded with adhesive, and the anti-leakage collar is not stuck to the protective cover and can be connected by a connecting chain. Through the above-mentioned design, the elastic seal can be detached and replaced. When it is damaged or worn, it is not necessary to replace the entire device; only the corresponding parts need to be replaced for continued use. This saves on operating costs to a certain extent and improves the economic efficiency of the device.

[0065] 5. Assembly and usage procedures of the device

[0066] (1) Assembly process

[0067] Component preparation: Prepare the elastic seal, protective cover, anti-leakage ring, and connecting chain.

[0068] Assembly steps: First, install the elastic seal into the protective cover, ensuring it is securely fixed. Then, insert the anti-leakage ring into the sampling gun. Next, place the assembled unit (elastic seal and protective cover) at the front end of the sampling gun. Finally, adjust the connecting chain length using the snap fastener. Installing the anti-leakage ring first facilitates a tight fit between the ring and the second opening of the protective cover when the sampling gun is inserted into the sampling port.

[0069] (2) Usage process

[0070] refer to Figure 2 The pulverized coal pipeline 8 is distributed vertically, and a sampling port 7 is opened on the pulverized coal pipeline 8. The staff holds the conical transition surface of the protective cover with one hand and squeezes it towards the sampling port; the other hand moves the sampling gun to fully insert it into the sampling port, and then pulls it out at the same speed to achieve constant speed sampling.

[0071] For powder leakage prevention devices equipped with anti-leakage collars and connecting chains, refer to... Figure 3 Before sampling, adjust the length of the connecting chain. Each time the sampling gun is pulled out, use the straightening of the connecting chain as a reference. Then, use the hand holding the sampling gun to push the anti-leakage sleeve back (at this time, one hand holds the protective cover, which can also fix the sampling gun, and the friction generated by pushing the anti-leakage sleeve will not cause the gun rod to move) or with the help of others, push the anti-leakage sleeve back to fit the second opening for reference when pulling out next time, so as to ensure that the sampling gun is pulled out to the same length each time.

[0072] This device also has the following advantages:

[0073] Compared to existing technologies, the anti-leakage device for the flat-head coal powder sampling gun of this invention can be adapted to various types of sampling ports, effectively avoiding the limitation of existing technologies that require a specific sampling sealing head for each type of sampling port. This advantage greatly enhances the versatility and practicality of the device, enabling it to be applied to coal powder sampling ports of coal mills of different specifications and designs.

[0074] In terms of material selection, the sealing body uses lightweight materials such as dense and hard foam sponge, sponge, and rubber; the limiting part of the protective cover uses a soft and elastic material similar to the leather sleeve at the front of a toilet plunger; the grip part of the protective cover uses lightweight plastic or other lightweight and sturdy materials. These material choices effectively control the weight of the entire device, while the design of each component facilitates gripping and operation by the staff. For example, the tapered transition surface design of the grip allows the staff to hold the coal powder sampling port with one hand while moving the sampling gun with the other hand for isokinetic sampling.

[0075] The elastic seal is not stuck to the protective cover. The limiting part and the gripping part of the protective cover are firmly bonded with adhesive, but each part is relatively independent. The anti-leakage collar is not stuck to the gripping part. This design allows each part to be easily disassembled and installed, and facilitates the partial replacement of damaged parts.

[0076] Through its effective anti-leakage design, this device significantly reduces coal dust leakage during sampling, improves the working environment for sampling personnel, reduces the health hazards of coal dust to workers, and also minimizes environmental pollution from coal dust leaks. From a business perspective, a good working environment contributes to increased employee job satisfaction and loyalty.

[0077] Example 2:

[0078] This embodiment is the same as embodiment 1 except for the following technical solutions:

[0079] like Figure 4 As shown, in special cases such as when the front end of the sampling port is obstructed ( Figure 4 The valve (9) allows the elastic sealing body to be flipped so that the large circular surface of the large-diameter end of the elastic sealing body extends into the protective cover and abuts against the limiting groove inside the protective cover, while the small circular surface of the small-diameter end extends into the sampling port. By fitting the small circular surface against the sampling port, the sampling port is sealed. Through this method of use, the device can adapt to various sampling ports of different shapes and sizes, increasing its versatility.

[0080] Example 3:

[0081] This embodiment is the same as embodiment 1 except for the following technical solutions:

[0082] like Figure 5As shown, this is a sampling port suitable for use with a valve wrench. Adjust the position of the first through hole. The elastic sealing sleeve is an eccentric cone rather than a perfect cone, and adjust the shape of the protective cover accordingly. This ensures that the first through hole is not at the exact center of the bottom circle of its large diameter end, and the side closer to the edge of the circle can be placed under the wrench without being obstructed by the wrench, ensuring that the sealing head can be installed and used smoothly even with a wrench.

[0083] Material selection: High-temperature resistant engineering plastics, such as polyphenylene sulfide (PPS), can also be used for the elastic seal. PPS has high strength, rigidity and heat resistance and can withstand the high-temperature environment during coal powder sampling.

[0084] Example 4:

[0085] This embodiment is the same as embodiment 1 except for the following technical solutions:

[0086] like Figure 6 As shown, the shape of the elastic seal body is further improved in this embodiment. The large-diameter end of the elastic seal body is designed as a frustum-like shape formed by cutting off a portion of an ellipsoid. This shape can provide more contact surfaces at different angles when fitting the sampling port, so as to adapt to more irregularly shaped sampling ports.

[0087] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A leak-proof device for a flat-head coal powder sampling gun, characterized in that, include: An elastic sealing body is provided with a first through hole for the sampling gun to pass through. The diameter of the first through hole corresponds to the outer diameter of the sampling gun, so that when the elastic sealing body is sleeved on the outside of the sampling gun barrel, it can fit snugly with the sampling gun. The protective cover is funnel-shaped and has a first opening facing the sampling port and a second opening away from the sampling port, the first opening being larger than the second opening; the elastic sealing body is detachably disposed inside the protective cover, the extended line of the axis of the first through hole passes through the first opening and the second opening, during sampling, the sampling gun passes through the first through hole, and by holding the protective cover and pushing it towards the sampling port, the elastic sealing body is squeezed to seal the gap between the sampling port and the sampling gun.

2. The anti-leakage device for the flat-head coal powder sampling gun according to claim 1, characterized in that: The elastic seal has a large-diameter end, a small-diameter end, and a tapered elastic surface connecting the large-diameter end and the small-diameter end, the diameter of which gradually decreases from the large-diameter end to the small-diameter end.

3. The anti-leakage device for the flat-head coal powder sampling gun according to claim 1, characterized in that: The inner wall of the protective cover has a limiting structure to prevent the elastic seal inside the protective cover from shifting.

4. The anti-leakage device for the flat-head coal powder sampling gun according to claim 3, characterized in that: The protective cover includes a limiting part and a gripping part connected together. The limiting part has a first opening at the end away from the gripping part, and the gripping part has a second opening at the end away from the limiting part. The inner wall of the limiting part has a limiting structure.

5. The anti-leakage device for the flat-head coal powder sampling gun according to claim 4, characterized in that: The limiting part has a large diameter end, a small diameter end, and a tapered limiting surface connecting the large diameter end and the small diameter end. The tapered limiting surface includes a plurality of connected limiting grooves. The inner diameter of the plurality of limiting grooves decreases sequentially from the large diameter end to the small diameter end. The large diameter end of the limiting part is provided with a first opening, and the small diameter end of the limiting part is connected to the gripping part.

6. The anti-leakage device for the flat-head coal powder sampling gun according to claim 4, characterized in that: The gripping part has a large-diameter end, a small-diameter end, and a tapered transition surface connecting the large-diameter end and the small-diameter end. The large-diameter end of the gripping part is connected to the limiting part, and the small-diameter end of the gripping part is provided with a second opening.

7. The anti-leakage device for the flat-head coal powder sampling gun according to claim 1, characterized in that: It also includes an extension tube having a second through hole for the sampling gun to pass through, the extension tube being connected to a second opening of the protective cover.

8. The anti-leakage device for the flat-head coal powder sampling gun according to claim 1, characterized in that: It also includes a powder-proof collar, which has a third through hole at its center for the sampling gun to pass through. The diameter of the third through hole corresponds to the outer diameter of the sampling gun, so that the powder-proof collar can fit snugly against the sampling gun when it is sleeved on the outside of the sampling gun barrel, and the powder-proof collar should contact the second opening during the sampling process.

9. The anti-leakage device for the flat-head coal powder sampling gun according to claim 8, characterized in that: It also includes a connecting chain, one end of which is connected to a second opening, and the other end of which is connected to a powder-proof collar. The connecting chain has a snap fastener that can adjust its length.

10. The anti-leakage device for the flat-head coal powder sampling gun according to claim 8, characterized in that: The inner diameters of the first and third through holes are 22mm to 25mm.

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