An adjustable negative pressure boiler slag sampling device

Abstract

This utility model discloses an adjustable negative pressure boiler slag sampling device. A plug is installed at the open end of an elliptical cross-section sampling container, which is eccentrically connected to the container via an eccentric rotating shaft. The elliptical cross-section sampling container is fixedly connected to a pull ring handle unit via a spoon handle. The pull ring handle unit includes an opening and closing linkage mechanism and a limit adjustment mechanism. The opening and closing linkage mechanism includes a pull ring, a connecting shaft, and a return spring. The connecting shaft is installed inside the hollow spoon handle, with one end connected to the pull ring and the other end connected to the eccentric rotating shaft. The return spring is sleeved on one end of the connecting shaft, which has a raised guide shaft. The limit adjustment mechanism is located at one end of the spoon handle and has an oblique spiral guide groove. The raised guide shaft is slidably installed within the spiral guide groove. This utility model features a simple and stable process, improves sampling efficiency, and is adaptable to different negative pressure intensities, effectively preventing slag from being sucked back under negative pressure.

Description

Technical Field

[0001] This utility model belongs to the technical field of boiler testing equipment, and in particular, it is an adjustable negative pressure boiler slag sampling device. Background Technology

[0002] In boiler operation monitoring and quality control systems, slag sampling is a crucial task. The accuracy and representativeness of the sampling results directly affect the assessment of key indicators such as boiler combustion efficiency, fuel adaptability, and pollutant emissions. However, the widely used traditional negative pressure boiler slag sampling device employs a simple long-handled spoon, which has revealed numerous problems in actual operation, seriously affecting the quality and efficiency of the sampling work. The specific problems with the long-handled spoon sampling process are as follows:

[0003] 1. Shallow spoon body and unsealed opening result in a negative pressure backflow rate exceeding 90%. Traditional long-handled spoon sampling devices have a shallow spoon body, limiting the amount of slag that can be held during sampling. When the spoon is removed from the slag pile, the limited space makes the slag highly susceptible to spillage due to external interference. Furthermore, the lack of an effective seal at the spoon opening means that, under the special operating environment of a negative pressure boiler, the furnace interior maintains a constant negative pressure. When the long-handled spoon is removed from the slag and exposed to this negative pressure environment, the unsealed opening causes the negative pressure within the furnace to rapidly generate a strong suction force, drawing a large amount of slag back into the spoon. Actual measurements and statistics show a negative pressure backflow rate exceeding 90%. This means that the vast majority of the slag samples painstakingly obtained by operators are drawn back into the boiler during the removal process, leaving only a negligible amount usable for analysis and testing. Because the sample size is too small and not representative, the test results cannot accurately reflect the true situation of boiler slag, which in turn affects the accurate judgment of the boiler's operating status and subsequent optimization and adjustment.

[0004] 2. Inability to obtain deep samples from conveyor belt gaps at low loads. During low-load operation, the amount of slag produced inside the boiler is relatively small. To fully utilize space and ensure conveying efficiency, the gaps between conveyor belts are typically designed to be narrow. Traditional long-handled scoops, due to their shape and size limitations, are too wide and have limited length, making it difficult to reach deep into the conveyor belt gaps for sampling. Even if operators attempt to force the scoop into the gap, insufficient space often leads to collisions between the scoop and the conveyor belt or other components, potentially damaging the sampling device, interfering with the normal operation of the conveyor belt, and even causing safety accidents. Furthermore, the accumulation of slag on the conveyor belt is irregular at low loads, with some slag accumulating around the gaps. Traditional long-handled scoops cannot effectively reach these areas for sampling, resulting in samples lacking comprehensiveness and representativeness.

[0005] 3. Manual operation makes it difficult to simultaneously control sampling and sealing actions. Sampling requires operators to accurately insert a long-handled spoon into the slag and quickly scoop out a suitable sample; sealing, on the other hand, requires immediately sealing the spoon after sampling to prevent the slag from being sucked back under negative pressure. When operating manually, operators often find it difficult to accurately complete the transition from sampling to sealing within a very short time. This operational uncertainty severely impacts the accuracy and repeatability of sampling results, making it difficult to guarantee that representative samples can be obtained each time.

[0006] In summary, traditional negative pressure boiler slag sampling devices using long-handled scoops have many problems, such as high negative pressure absorption rate, limited sampling position under low load, and difficulty in achieving synchronous control of actions during manual operation. These problems seriously restrict the quality and efficiency of slag sampling. Summary of the Invention

[0007] The purpose of this invention is to provide an adjustable negative pressure boiler slag sampling device to solve the problems of negative pressure suction and narrow slit sampling difficulties in the prior art.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] An adjustable negative pressure boiler slag sampling device includes an elliptical cross-section sampling container, a plug, and a pull ring handle unit;

[0010] The plug is installed at the open end of the elliptical cross-section sampling container. The plug is eccentrically connected to the elliptical cross-section sampling container via an eccentric rotating shaft. The elliptical cross-section sampling container is fixedly connected to the pull ring handle unit via a spoon handle. The pull ring handle unit is provided with an opening and closing linkage mechanism and a limit adjustment mechanism. The opening and closing linkage mechanism includes a pull ring, a connecting shaft, and a return spring. The connecting shaft is installed inside the hollow spoon handle. One end of the connecting shaft is connected to the pull ring, and the other end of the connecting shaft is connected to the eccentric rotating shaft. The return spring is sleeved on one end of the connecting shaft. A protruding guide shaft is provided on the connecting shaft. The limit adjustment mechanism is located at one end of the spoon handle. An oblique spiral guide groove is provided on the limit adjustment mechanism, and the protruding guide shaft is slidably installed in the spiral guide groove.

[0011] Furthermore, the inner wall of the elliptical cross-section sampling container is provided with anti-slip ridges.

[0012] Furthermore, the plug is made of high-temperature resistant stainless steel, and a graphite sealing ring is provided on the edge of the plug.

[0013] Furthermore, when the plug is closed, it is sealed at an angle to the opening of the elliptical cross-section sampling container, and the angle is 5° to 15°.

[0014] Furthermore, the inclination angle of the spiral guide groove is 30°.

[0015] Furthermore, the opening and closing linkage mechanism also includes a handle outer frame, which is fixedly connected to the spoon handle, and there is a gap between the handle outer frame and the pull ring.

[0016] Furthermore, a closing limit screw and an opening limit screw are respectively provided at both ends of the spiral guide groove, and both the closing limit screw and the opening limit screw are installed on the external thread of the spoon handle.

[0017] Furthermore, a spiral guide rail is provided inside the spiral guide groove, and the protruding guide shaft is slidably mounted on the spiral guide rail through a clearance fit.

[0018] Furthermore, the two ends of the reset spring are respectively connected to the spoon handle and the pull ring.

[0019] Furthermore, the opening angle of the plug is ≥60°.

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

[0021] This invention provides an adjustable negative pressure boiler slag sampling device. By installing a plug at the open end of an elliptical cross-section sampling container, the elliptical cross-section sampling container can be inserted into the slag pile more flexibly, achieving more precise sampling and greatly improving the representativeness and accuracy of the sampling. The plug is eccentrically connected to the elliptical cross-section sampling container via an eccentric rotating shaft. When the plug is closed, the tilt angle pressure generated by the eccentricity enhances the sealing performance of the plug and improves the sample retention rate under negative pressure. The elliptical cross-section sampling container is fixedly connected to a pull ring handle unit via a spoon handle. The pull ring handle unit is equipped with an opening and closing linkage mechanism and a limit adjustment mechanism. The opening and closing linkage mechanism includes a pull ring, a connecting shaft, and a return spring. The connecting shaft is installed inside the hollow spoon handle. One end of the connecting shaft is connected to the pull ring, and the other end is connected to the eccentric rotating shaft. The return spring is sleeved on one end of the connecting shaft. A raised guide shaft is provided on the connecting shaft. The limit adjustment mechanism is located at one end of the spoon handle and has an oblique spiral guide groove. The raised guide shaft is slidably installed in the spiral guide groove. Simply pulling the pull ring moves the connecting shaft, causing the protruding guide shaft to move along the spiral guide groove, which in turn drives the eccentric rotating shaft to rotate and open the plug. Releasing the pull ring activates the return spring, allowing the plug to automatically spring back and close. This invention is simple and easy to implement; the entire process is simple, efficient, and stable, requiring no complex operating procedures or professional skills, greatly reducing the workload of operators and improving sampling efficiency. Simultaneously, the opening and closing angle of the plug is precisely controllable, adapting to different negative pressure intensities, effectively preventing the influence of external air and furnace negative pressure on the sample inside the elliptical cross-section sampling container, and preventing slag from being drawn back under negative pressure.

[0022] Furthermore, the clearance fit between the spiral slide rail and the raised guide shaft makes the opening and closing process of the plug smoother and more stable, reducing jamming and wear during operation, ensuring smooth movement at high temperatures, and improving the reliability and stability of the device. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a physical image of the adjustable negative pressure boiler slag sampling device of this utility model.

[0025] Figure 2 This is a schematic diagram of the opening and closing linkage mechanism of this utility model.

[0026] Figure 3 This is a schematic diagram of the connecting shaft structure of this utility model.

[0027] Figure 4 This is a schematic diagram of the elliptical cross-section sampling container and its plug structure according to this utility model.

[0028] Figure 5 This is a schematic diagram of the limit adjustment mechanism of this utility model.

[0029] Figure 6 This is a schematic diagram of the assembly structure of the elliptical cross-section sampling container of this utility model.

[0030] Wherein: 1-Elliptical cross-section sampling container, 2-Cap, 3-Pull ring, 4-Handle outer frame, 5-Spiral slide rail, 6-Connecting shaft, 7-Protruding guide shaft, 8-Spiral guide groove, 9-Close limit screw, 10-Open limit screw, 11-Reset spring. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages 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. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

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

[0034] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing the 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, and therefore should not be construed as a limitation on the utility model. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0036] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] The present invention will now be described in further detail with reference to the accompanying drawings:

[0038] See Figure 1 This utility model provides an adjustable negative pressure boiler slag sampling device, including an elliptical cross-section sampling container 1, a plug 2, and a pull ring handle unit.

[0039] The elliptical cross-section sampling container 1 has a depth ≥25cm. The elliptical cross-section better adapts to slag piles of different shapes and distributions, especially in areas with limited space or irregular slag accumulation. The inner wall of the elliptical cross-section sampling container 1 is equipped with anti-slip textured surfaces to reduce the possibility of sample slippage during sampling. Figure 4 As shown, the plug 2 is made of high-temperature resistant stainless steel baffle material and is installed at the open end of the elliptical cross-section sampling container 1. A graphite sealing ring is provided on the edge of the plug 2. The graphite sealing ring has excellent sealing performance and high-temperature and corrosion resistance. When the plug 2 is closed, the graphite sealing ring can tightly fit against the open end of the elliptical cross-section sampling container 1, effectively preventing the influence of external air and negative pressure inside the furnace on the sample inside the container, and preventing slag from being drawn back under negative pressure. The plug 2 is eccentrically connected to the elliptical cross-section sampling container 1 via an eccentric rotating shaft. When the plug 2 is closed, it forms a 5°~15° angle with the opening of the elliptical cross-section sampling container 1 for sealing.

[0040] like Figure 6 As shown, the elliptical cross-section sampling container 1 is fixedly connected to the pull ring handle unit via a spoon handle. The pull ring handle unit is equipped with an opening and closing linkage mechanism and a limit adjustment mechanism. Figure 2 As shown, the opening and closing linkage mechanism includes a pull ring 3, a handle outer frame 4, a connecting shaft 6, a raised guide shaft 7, and a return spring 11. The spoon handle is a hollow cylindrical structure. The connecting shaft 6 is installed in the cavity of the spoon handle. One end of the connecting shaft 6 is connected to the pull ring 3, and the other end is connected to an eccentric rotating shaft. The pull ring 3 is linked through the eccentric rotating shaft on the plug 2 of the connecting shaft 6. The handle outer frame 4 is fixedly connected to the spoon handle. There is a small gap between the handle outer frame 4 and the pull ring 3 to prevent high-temperature slag particles from entering. The return spring 11 is sleeved on one end of the connecting shaft 6. The two ends of the return spring 11 are connected to the spoon handle and the pull ring 3, respectively. Under the elastic force of the return spring 11, the connecting shaft 6 will drive the pull ring 3 and the plug 2 to automatically spring back and close.

[0041] like Figure 5As shown, a limit adjustment mechanism is located at one end of the spoon handle. The limit adjustment mechanism has an inclined spiral guide groove 8 with an inclination angle of 30°. This inclination angle design allows the raised guide shaft 7 to achieve relatively smooth and precise rotational movement when moving along the spiral slide rail 5. A closing limit screw 9 and an opening limit screw 10 are respectively located at both ends of the spiral guide groove 8. Both the closing limit screw 9 and the opening limit screw 10 are installed on the external threads of the spoon handle. By adjusting the positions of the closing limit screw 9 and the opening limit screw 10, the maximum opening and closing angle of the cap 2 can be precisely limited. Rotate the closing limit screw 9 until its end contacts the raised guide shaft 7, locking the raised guide shaft 7 at the "zero position". Slowly pull the pull ring 3 to its maximum stroke and observe whether the plug 2 is fully open. If it is not fully open, rotate the opening limit screw 10 until it contacts the raised guide shaft 7, locking the maximum opening position. Repeat the operation of the pull ring 3 to confirm that the opening and closing angle of the plug 2 matches the closing limit screw 9 and the opening limit screw 10, with no over-opening or under-closing phenomenon. A spiral guide rail 5 is provided in the spiral guide groove 8, and a raised guide shaft 7 is provided on the connecting shaft 6. Figure 3 As shown, the raised guide shaft 7 is slidably mounted on the spiral slide rail 5 with a clearance fit. When the operator pulls or releases the pull ring 3, the raised guide shaft 7 moves along the spiral slide rail 5, thereby realizing the rotational opening and closing action of the plug 2.

[0042] The working principle of this utility model's adjustable negative pressure boiler slag sampling device:

[0043] When the pull ring 3 is pulled, the connecting shaft 6 moves accordingly, causing the raised guide shaft 7 to move along the spiral slide rail 5, which in turn drives the eccentric rotating shaft to rotate, thus opening the plug 2. As the raised guide shaft 7 moves within the spiral slide rail 5, its trajectory is restricted between the closing limit screw 9 and the opening limit screw 10. The closing limit screw 9 and the opening limit screw 10 respectively physically stop the raised guide shaft 7, ensuring that the opening angle of the plug 2 is ≥60°. Releasing the pull ring 3 activates the return spring 11, and the plug 2 returns to its naturally closed state.

[0044] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An adjustable negative pressure boiler slag sampling device, characterized in that, It includes an elliptical cross-section sampling container (1), a plug (2), and a pull ring handle unit; The plug (2) is installed at the open end of the elliptical cross-section sampling container (1). The plug (2) is eccentrically connected to the elliptical cross-section sampling container (1) through an eccentric rotating shaft. The elliptical cross-section sampling container (1) is fixedly connected to the pull ring handle unit through the spoon handle. The pull ring handle unit is provided with an opening and closing linkage mechanism and a limit adjustment mechanism. The opening and closing linkage mechanism includes a pull ring (3), a connecting shaft (6), and a return spring (11). The connecting shaft (6) is installed inside the hollow spoon handle. One end of the connecting shaft (6) is connected to the pull ring (3), and the other end of the connecting shaft (6) is connected to the eccentric rotating shaft. The return spring (11) is sleeved on one end of the connecting shaft (6). A protruding guide shaft (7) is provided on the connecting shaft (6). The limit adjustment mechanism is provided at one end of the spoon handle. An oblique spiral guide groove (8) is opened on the limit adjustment mechanism. The protruding guide shaft (7) is slidably installed in the spiral guide groove (8).

2. The adjustable negative pressure boiler slag sampling device according to claim 1, characterized in that, The inner wall of the elliptical cross-section sampling container (1) is provided with anti-slip ridges.

3. The adjustable negative pressure boiler slag sampling device according to claim 1, characterized in that, The plug (2) is made of high-temperature resistant stainless steel, and a graphite sealing ring is provided on the edge of the plug (2).

4. The adjustable negative pressure boiler slag sampling device according to claim 1, characterized in that, When the plug (2) is closed, it is sealed at an angle to the opening of the elliptical cross-section sampling container (1), and the angle is 5°~15°.

5. The adjustable negative pressure boiler slag sampling device according to claim 1, characterized in that, The inclination angle of the spiral guide groove (8) is 30°.

6. The adjustable negative pressure boiler slag sampling device according to claim 1, characterized in that, The opening and closing linkage mechanism also includes a handle outer frame (4), which is fixedly connected to the spoon handle, and there is a gap between the handle outer frame (4) and the pull ring (3).

7. The adjustable negative pressure boiler slag sampling device according to claim 1, characterized in that, The spiral guide groove (8) is provided with a closing limit screw (9) and an opening limit screw (10) at both ends, and the closing limit screw (9) and the opening limit screw (10) are both installed on the external thread of the spoon handle.

8. The adjustable negative pressure boiler slag sampling device according to claim 1, characterized in that, The spiral guide groove (8) is provided with a spiral slide rail (5), and the protruding guide shaft (7) is slidably mounted on the spiral slide rail (5) with clearance fit.

9. The adjustable negative pressure boiler slag sampling device according to claim 1, characterized in that, The two ends of the return spring (11) are connected to the spoon handle and the pull ring (3) respectively.

10. An adjustable negative pressure boiler slag sampling device according to claim 1, characterized in that, The opening angle of the plug (2) is ≥60°.

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