Online sampling device for metal cleaner production

Abstract

The utility model provides a kind of metal cleaning agent production on-line sampling device, belong to cleaning agent production and processing technical field, including sheath pipe, telescopic pipe body, sampling assembly and flexible seal ring;Sheath pipe longitudinally extends into the sampling port of reaction kettle;Telescopic pipe body includes fixed pipe body and extension pipe body, fixed pipe body is from top to bottom and is arranged in the inside of sheath pipe, extension pipe body is longitudinally moved and is arranged in the inside of fixed pipe body, the lower end of extension pipe body is from the lower end opening of sheath pipe and extends;Sampling assembly includes sampling hose and sampling head, sampling head is connected the lower end of extension pipe body;The outer diameter of sampling head is consistent with the outer diameter of extension pipe body;Flexible seal ring is located at the bottom of sheath pipe, the inside of flexible seal ring is used to adhere the outside wall of extension pipe body.The metal cleaning agent production on-line sampling device provided by the utility model removes the residue on the outside wall of extension pipe body after sampling is completed;It can also close the inner cavity of sheath pipe, to avoid reactant into.

Description

Technical Field

[0001] This utility model belongs to the field of cleaning agent production and processing technology, and more specifically, it relates to an online sampling device for metal cleaning agent production. Background Technology

[0002] In the industrial production of metal cleaning agents, various materials, including organic solvents, anionic surfactants, nonionic surfactants, penetrants, emulsifiers, alkaline inorganic additives, and water, are added to a reaction vessel and thoroughly mixed to form a stable metal cleaning agent product. The uniformity of the material mixture directly affects the cleaning effect and quality stability of the product. Therefore, sampling devices are used during the production process to sample and test the mixed materials to determine the uniformity of the mixture.

[0003] In existing technologies, telescopic sampling tubes are commonly used to obtain metal cleaning agent samples at different heights within a reactor. These tubes typically employ a multi-section nested structure to achieve their telescopic function, allowing the sampling head at the lower end to extend to the target height for sampling. However, after sampling, reactants remain on the surface of the tube and in the nesting gaps. These residues not only accelerate corrosion of the sampling tube but also act as impurities in subsequent samples, interfering with the original cleaning agent's composition and leading to deviations in the mixing uniformity test results, ultimately affecting product quality. Utility Model Content

[0004] The purpose of this invention is to provide an online sampling device for the production of metal cleaning agents, which aims to solve the problem that residues on the surface of the telescopic sampling tube and in the nesting gaps affect the test results of the mixing uniformity.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide an online sampling device for the production of metal cleaning agents, for installation inside a reaction vessel, comprising:

[0006] A sheath tube extends longitudinally into the sampling port of the reactor. The upper end of the sheath tube is fixedly connected to the reactor, and the lower end of the sheath tube extends into the inner cavity of the reactor.

[0007] A telescopic tube includes a fixed tube and an extension tube. The fixed tube is inserted into the inner side of the sheath tube from top to bottom. The upper end of the fixed tube is connected to the upper end of the sheath tube, and the lower end of the fixed tube is located inside the sheath tube. The extension tube is longitudinally movably disposed inside the fixed tube, and the lower end of the extension tube extends out from the lower end opening of the sheath tube.

[0008] A sampling assembly includes a sampling hose and a sampling head, wherein the sampling head is connected to the lower end of the extension tube; the sampling hose passes through the inner side of the extension tube, a first end of the sampling hose is connected to a suction device, and a second end of the sampling hose extends from the lower end of the extension tube and communicates with the inner cavity of the sampling head; the outer diameter of the sampling head is the same as the outer diameter of the extension tube.

[0009] A flexible sealing ring is located at the bottom of the sheath tube. The outer side of the flexible sealing ring is fixedly connected to the inner wall of the sheath tube, and the inner side of the flexible sealing ring is used to fit against the outer wall of the extension tube.

[0010] During the upward movement of the extension tube after sampling, the inner side of the flexible sealing ring slides against the extension tube to scrape the outer wall of the extension tube and the outer wall of the sampling head.

[0011] The beneficial effects of the online sampling device for metal cleaning agent production provided by this utility model are as follows: Compared with the prior art, the combination of a sheath tube, a telescopic tube body and a flexible sealing ring allows for timely scraping of residues on the outer wall of the telescopic tube body to remove residues, thereby meeting the requirement that the telescopic tube body can be reused without affecting the mixing uniformity test results.

[0012] A sheath is placed inside the sampling port to protect the embedded connection of the telescopic tube. This ensures that the embedded connection remains inside the sheath when the tube is not in use. A flexible sealing ring is used to seal the bottom of the sheath, completely enclosing the telescopic tube and preventing it from coming into contact with the reactants when not in use, thus avoiding any residue of reactants at the embedded connection and on the outer surface of the telescopic tube.

[0013] The telescopic fitting and sampling assembly work together to avoid direct contact between the inside of the telescopic fitting and the reactants by using the internal sampling hose. This ensures the sampling function while reducing the possibility of reactant residue. Compared to the embedded structure of the telescopic fitting, the smooth surface of the hose can reduce the amount of reactant adhesion and reduce the impact of residue on the telescopic fitting. It can also be used in conjunction with other flushing methods to resolve reactant residue on the smooth surface.

[0014] The flexible sealing ring contacts the extension tube body to seal the inner cavity of the sheath tube and prevent reactants from entering. At the same time, when the flexible sealing ring slides relative to the extension tube body, it can scrape off the residue on the outside of the extension tube body, separating the residue from the outer surface of the extension tube body and ensuring that there is no residue on the outer surface of the extension tube body after it is retracted into the sheath tube.

[0015] The outer diameter of the sampling head is the same as that of the extension tube, which can reduce the gap between the sampling head and the extension tube. This connection method can not only ensure that the flexible sealing ring can smoothly transition from the outer surface of the extension tube to the outer surface of the sampling head, avoiding the presence of residual dead corners, but also ensure that the flexible sealing ring will not experience local stress concentration during the transition, thus avoiding uneven stress on the flexible sealing ring that could lead to tearing or deformation.

[0016] In another embodiment of this application, the flexible sealing ring includes:

[0017] A sealing part, wherein the inner wall of the sealing part is attached to the outer wall of the extension tube or the sampling head;

[0018] The inlet section is located at the lower end of the sealing section, and the inner wall of the inlet section gradually slopes inward from bottom to top to form an inlet opening facing downward.

[0019] In this embodiment, the sealing part is used to achieve basic sealing and scraping functions, and the inlet part forms an inlet port at the lower part of the flexible sealing ring. The funnel-shaped structure of the inlet port allows the scraped residue to be discharged along the inclined surface of the inlet port, reducing the residue on the flexible sealing ring. In addition, the inlet port can guide the sampling head to enter, reduce the entry resistance, and avoid the sealing part of the flexible sealing ring from tearing or deforming due to stress concentration.

[0020] In another embodiment of this application, the flexible sealing ring includes:

[0021] Sealing ring body;

[0022] Multiple annular protrusions are spaced axially on the inner sidewall of the sealing ring body, and the annular protrusions are used to seal and scrape the extension tube.

[0023] In this embodiment, an annular protrusion is added to the inner side of the sealing ring body of the flexible sealing ring. The annular protrusion is used to seal and scrape the extension tube. The annular protrusion forms a multi-scraping structure on the surface of the extension tube, which reduces the risk of residue accumulation causing edge failure of the inner surface of the flexible sealing ring.

[0024] In another embodiment of this application, the lower end of the fixed tube is provided with a limiting sealing structure, the limiting sealing structure comprising:

[0025] A limiting protrusion is provided at the lower end of the fixed tube body and protrudes inward;

[0026] A sealing ring is fixedly connected to the inner side of the limiting protrusion, and the inner wall of the sealing ring is attached to the outer wall of the extension tube.

[0027] In this embodiment, the limiting protrusion and the structure at the upper end of the extension tube form a limiting position to prevent the extension tube from coming out; a sealing ring is added to the inside of the limiting protrusion to seal the gap between the two, maintain the sliding stability of the extension tube, and further prevent the reactants from entering the inner cavity of the telescopic tube.

[0028] In another embodiment of this application, the extension tube includes:

[0029] The intermediate tube is slidably disposed on the inner side of the fixed tube body; the flexible sealing ring is attached to the outer side wall of the intermediate tube;

[0030] A traction tube is slidably disposed inside the intermediate tube, and the sampling head is installed at the lower end of the traction tube;

[0031] An auxiliary sealing ring is fixed on the inner side of the lower end of the intermediate tube, and the inner side of the auxiliary sealing ring is attached to the outer wall of the traction tube.

[0032] In this embodiment, the extension tube can adopt a structure of multiple nested tubes. A flexible sealing ring is used to remove the residue on the outside of the middle tube, and an auxiliary sealing ring fixed inside the middle tube is used to remove the residue on the outside of the traction tube, so as to achieve the removal of residue from the multi-layer nested telescopic tube.

[0033] In another embodiment of this application, the inner cavity of the telescopic tube is connected to a water injection structure, which is used to inject pure water into the inner cavity of the telescopic tube.

[0034] The auxiliary sealing ring has a flow passage structure that allows water to pass through, and the water outlet direction of the flow passage structure is towards the traction pipe.

[0035] In this embodiment, water is injected into the inner cavity of the telescopic tube, and a suitable flow passage structure is provided on the auxiliary sealing ring. After the telescopic tube is filled with water, during the retraction process of the telescopic tube, the volume of the inner cavity of the telescopic tube decreases, and the water in the inner cavity is sprayed out from the flow passage structure. The water flow sprays onto the outer wall of the traction tube to rinse the outer side of the traction tube, reducing the residue on the outer side of the traction tube. At the same time, the water flow, combined with the scraping action of the auxiliary sealing ring, can complete the cleaning of the outer wall of the traction tube.

[0036] As another embodiment of this application, the overcurrent structure includes:

[0037] Multiple flow holes are evenly distributed around the auxiliary sealing ring.

[0038] In this embodiment, when not subjected to water pressure, the flow passage is in a closed state due to its own elasticity and the squeezing action of the traction pipe; under water pressure, the flow passage is opened by the water flow, allowing water to pass through; during flushing, the flow passage evenly sprays the water in the inner cavity of the telescopic pipe onto the outer wall of the traction pipe, and multiple flow passages can improve the uniformity of water flow distribution on the outside of the traction pipe.

[0039] In another embodiment of this application, the upper end of the traction tube has a retaining ring structure, and the retaining ring structure has a clearance hole.

[0040] In this embodiment, the retaining ring structure and the limiting structure of the intermediate pipe cooperate to limit the movement and prevent the traction pipe from coming out. In order to match the water flow pressure, a clearance hole is opened on the retaining ring structure so that the water flow in the pipe body can quickly flow and balance the pressure on the upper and lower sides of the retaining ring structure, ensuring that the water flow can smoothly pass through the flow hole on the auxiliary sealing ring and be ejected. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 A schematic diagram of the structure of the online sampling device for metal cleaning agent production provided in this embodiment of the present invention under operating conditions;

[0043] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0044] Figure 3 A schematic diagram of the online sampling device for metal cleaning agent production provided in this embodiment of the present invention in the recovered state;

[0045] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0046] Figure 5 This is a schematic diagram of the retaining ring structure provided in an embodiment of the present utility model;

[0047] Figure 6 This is a schematic diagram of the structure of the reaction vessel provided in an embodiment of the present utility model;

[0048] Figure 7 for Figure 6 A magnified view of point C in the middle.

[0049] In the diagram: 1. Sheath; 2. Fixed tube body; 3. Sealing gasket; 4. Sampling hose; 5. Flexible sealing ring; 6. Intermediate tube; 7. Traction tube; 8. Sampling head; 9. Sampling hole; 10. Mounting flange; 11. Overlap folded edge; 12. Sealing ring; 13. Retaining ring structure; 14. Displacement hole; 15. Water injection pipe; 16. Sealing cover; 17. Flange; 18. Reactor. Detailed Implementation

[0050] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0051] Please see Figures 1 to 7 The online sampling device for metal cleaning agent production provided by this utility model is described below. The online sampling device for metal cleaning agent production includes a sheath tube 1, a telescopic tube body, a sampling component, and a flexible sealing ring 5. The sheath tube 1 extends longitudinally into the sampling port of the reaction vessel 18, with its upper end fixedly connected to the reaction vessel 18 and its lower end extending into the inner cavity of the reaction vessel 18. The telescopic tube body includes a fixed tube body 2 and an extension tube body. The fixed tube body 2 passes through the inner side of the sheath tube 1 from top to bottom, with its upper end connected to the upper end of the sheath tube 1 and its lower end located inside the sheath tube 1. The extension tube body is longitudinally movable inside the fixed tube body 2, with its lower end extending out from the lower opening of the sheath tube 1. The sampling component includes a sampling hose 4 and a sampling... The sampling head 8 is connected to the lower end of the extension tube body; the sampling hose 4 is inserted inside the extension tube body, the first end of the sampling hose 4 is connected to the suction device, and the second end of the sampling hose 4 extends from the lower end of the extension tube body and communicates with the inner cavity of the sampling head 8; the outer diameter of the sampling head 8 is the same as the outer diameter of the extension tube body; the flexible sealing ring 5 is located at the bottom of the sheath tube 1, the outer side of the flexible sealing ring 5 is fixedly connected to the inner wall of the sheath tube 1, and the inner side of the flexible sealing ring 5 is used to fit against the outer wall of the extension tube body; during the upward movement of the extension tube body after sampling, the inner side of the flexible sealing ring 5 slides with the extension tube body to scrape the outer wall of the extension tube body and the outer wall of the sampling head 8.

[0052] The aforementioned sheath 1, telescopic tube body, and sampling head 8 are made of rigid materials, but all three can be made of plastic, such as polyethylene, polyvinyl chloride, or polyvinylidene fluoride, depending on the chemical properties of the specific metal cleaning agent. Furthermore, the sampling head 8 can also be made of a metal material that does not react with the metal cleaning agent; for example, austenitic stainless steel can be used when the metal cleaning agent is neutral or weakly alkaline.

[0053] Both the flexible sealing ring 5 and the sampling hose 4 mentioned above are made of flexible materials. The flexible sealing ring 5 can be made of fluororubber, EPDM rubber, nitrile rubber, fluorosilicone rubber, etc. The sampling hose 4 can be made of fluororubber hose, EPDM rubber hose, etc.

[0054] In existing telescopic sampling tubes, during sampling, the surfaces of each tube body come into contact with the reactants, and the reactants adhere to the outer wall of the tube body. When the sampling tube is retracted, the reactants remain on the outer wall of the tube body and enter the gap between adjacent tube bodies as the tube body retracts.

[0055] Even though existing technologies use pure water backwashing to remove residues, they can only remove reactants from the inner wall of the tube, not from the outer wall.

[0056] Reactants remaining on the tube are called residues. These residues adhere to the outer wall of the tube, affecting its expansion and contraction. Furthermore, during the next sampling, the residues dissolve back into the reactants, affecting the local composition of the reactants, and may even be reabsorbed by the sampling tube, impacting the homogeneity of the reactants. Removing and cleaning the tube after each sampling is not only time-consuming and labor-intensive, but also causes frequent opening of the sampling port due to the reaction process, allowing a large amount of air to enter and potentially affecting the reaction's progress.

[0057] To address the above issues, the online sampling device for metal cleaning agent production employs a combination of a sheath tube 1, a telescopic tube body, and a flexible sealing ring 5. By promptly scraping the residue on the tube body, the residue on the outer wall of the telescopic tube body is removed, thus meeting the requirement that the telescopic tube body can be reused without affecting the mixing uniformity test results.

[0058] During installation, the fixed tube 2, the extension tube, and the sampling hose 4 are assembled first. During assembly, the fixed tube 2, the extension tube, and the sampling hose 4 are sequentially nested from the outside in, with the lower end of the sampling hose 4 fixedly connected to the lower end of the extension tube. The lower end of the sampling hose 4 seals the lower port of the extension tube. After assembly, the fixed tube 2, the extension tube, and the sampling hose 4 are used as a sampling structure.

[0059] Then, assemble the sheath tube 1, sampling structure, and sampling head 8. Pass the sampling structure through the sheath tube 1 from top to bottom. Fix the upper end of the fixed tube body 2 to the upper end of the sheath tube 1. Ensure that the lower end of the extension tube body can be completely retracted into the sheath tube 1. Pull the lower end of the extension tube body out from the lower end of the sheath tube 1. Fix the sampling head 8 to the lower end of the extension tube body, so that the lower end of the sampling hose 4 is connected to the inner cavity of the sampling head 8, ensuring that the sample extracted by the sampling head 8 enters the sampling hose 4 completely after entering the inner cavity of the sampling head 8.

[0060] It should be noted that the flexible sealing ring 5 can be fixed to the sheath tube 1 first, and then the sheath tube 1 and the sampling structure can be assembled; or it can be assembled after the sheath tube 1 and the sampling structure are fixed. The flexible sealing ring 5 must be fixed before the sampling head 8 is installed.

[0061] During sampling, when sampling is required, the extension tube, sampling hose 4, and sampling head 8 move down synchronously until the sampling head 8 reaches the desired sampling height. The power device, such as the suction pump connected to one end of the sampling hose 4, is activated, and the reactants are sequentially extracted through the sampling head 8 and sampling hose 4 to the sample storage device.

[0062] After sampling is completed, the extension tube, sampling hose 4 and sampling head 8 move upward synchronously. During the movement, the flexible sealing ring 5 adheres to the extension tube and slides relative to the extension tube. The flexible sealing ring 5 scrapes away the residue on the outer wall of the extension tube, allowing the reactants to fall off in time. The extension tube moves upward until the sampling head 8 contacts the flexible sealing ring 5.

[0063] It should be noted that the length of the fixed tube 2 is less than the length of the sheath tube 1. The sampling hole 9 of the sampling head 8 is located at the bottom or on the side wall of the sampling head 8. During the extension of the telescopic tube, the extension tube can actively slide by installing an electric push rod or other telescopic drive device inside, causing the sampling hose 4 to move; alternatively, the extension tube can be passively moved downwards by the weight of the sampling head 8 as the sampling hose 4 extends. Conversely, during the retraction of the telescopic tube, the extension tube can actively retract, causing the sampling head 8 to move upwards, or it can be passively moved upwards by the shortening of the hose.

[0064] The sampling hose 4 can also be connected to a backflushing system, which uses pure water for backflushing to reduce reactant residue inside the sampling hose 4 and sampling head 8. However, the backflushing system cannot remove residues on the outside of the telescopic tube. Residues on the outer wall of the telescopic tube are removed by the scraping action of the flexible sealing ring 5.

[0065] The online sampling device for metal cleaning agent production provided by this utility model, compared with the prior art, uses a protective sleeve 1 as a protective structure to protect the telescopic tube body inside. When the telescopic tube body does not need to be sampled, it is retracted to the inside of the protective sleeve 1, avoiding contact with the reactants. The fixed tube body 2 of the telescopic tube body is located inside the protective sleeve 1, and the connection gap between the fixed tube body 2 and the extension tube body is always inside the protective sleeve, preventing the connection gap from being exposed to the reactants and forming a dead corner for residues. The sampling hose 4 is located inside the telescopic tube body and is connected to the sampling head 8 to achieve sampling. During sampling, the reactants do not contact the outer wall of the sampling hose 4. After sampling is completed, only the extension tube body moves upward and rubs against the flexible sealing ring 5 at the bottom of the protective sleeve 1. The flexible sealing ring 5 removes the residues on the outer wall of the extension tube body. In addition, the flexible sealing ring 5 can also seal the inner cavity of the protective sleeve 1 to prevent reactants from entering.

[0066] In some possible embodiments, such as Figure 1 , Figure 2 and Figure 4 As shown, the flexible sealing ring 5 is a standard circular ring structure with a rectangular longitudinal section. This structure provides the flexible sealing ring 5 with good stability and deformation buffer space. During installation, the outer wall of the sealing ring and the inner wall of the sheath tube 1 can be firmly connected by bonding with high-strength adhesive or by a slot-type limiting structure. When using a slot-type limiting structure, a recessed slot needs to be made on the inner wall of the sheath tube 1 to achieve precise positioning of the flexible sealing ring 5 and prevent displacement or detachment of the flexible sealing ring 5 within the sheath tube 1. Alternatively, adhesive can be applied to the recessed slot, using a combination of snap-fit ​​and adhesive to connect the flexible sealing ring 5.

[0067] The flexible sealing ring 5 is elastic, and its inner wall can elastically contract to tightly fit the outer surface of the extension tube. Even if there are minor dimensional deviations or surface unevenness in the extension tube, a zero-leakage sealing barrier can be formed. Under the dual action of the material's elastic restoring force and surface contact pressure, the flexible sealing ring 5 can effectively resist the penetration of reactants and ensure the sealing of the inner cavity of the sheath tube 1.

[0068] During the relative movement of the flexible sealing ring 5 and the extension tube, the flexible sealing ring 5 maintains a tight fit with the outer wall of the tube due to its high elastic deformation characteristics. The inner edge of its rectangular cross-section forms a scraping structure, which can peel off residues adhering to the outer surface of the tube during relative sliding. This scraping process has both physical cleaning and sealing protection functions, effectively preventing residue accumulation through continuous scraping while preventing impurities from entering the sealing gap.

[0069] The dynamic scraping characteristics of the flexible sealing ring 5 reduce equipment maintenance costs, and the cleaning function of the flexible sealing ring 5 can extend the service life of the extension tube and reduce the frequency of manual disassembly.

[0070] In another embodiment, the flexible sealing ring 5 includes a sealing part and an inlet part. The inner wall of the sealing part is attached to the outer wall of the extension tube or the sampling head 8. The inlet part is located at the lower end of the sealing part, and the inner wall of the inlet part gradually slopes inward from bottom to top to form an inlet with a downward opening.

[0071] The sealing part of the flexible sealing ring 5 serves as the main functional area. Its inner wall forms an interference fit with the outer surface of the extension tube or the outer surface of the sampling head 8. It generates uniform contact pressure through elastic deformation to ensure the sealing effect. At the same time, the inner edge of the sealing part forms a scraping structure to peel off the residues attached to the outer surface of the tube.

[0072] The inlet is located below the sealing part, and its inner inclined surface forms a funnel-shaped inlet. During the entry of the sampling head 8 into the flexible sealing ring 5, the inlet guides the sampling head 8 to automatically center along the conical surface, reducing entry resistance and preventing stress concentration in the sealing part that could lead to tearing or deformation. Simultaneously, the inclined surface of the inlet also has a guiding function, effectively diverting residues and preventing their accumulation at the bottom of the flexible sealing ring 5.

[0073] In another embodiment, the flexible sealing ring 5 includes a sealing ring body and a plurality of annular protrusions, which are axially spaced on the inner sidewall of the sealing ring body. The annular protrusions are used to seal and scrape the extension tube.

[0074] Multiple annular protrusions are evenly distributed along the axial direction on the inner side wall of the sealing ring body. Their cross-section is trapezoidal or semi-circular, which can achieve both gradient sealing and scraping functions.

[0075] When the annular protrusions come into contact with the extension tube, they create localized high-stress areas, forming multiple independent sealing structures that effectively prevent residue penetration. The multiple annular protrusions also reduce the contact area between the flexible sealing ring 5 and the extension tube, lowering the friction between them. This ensures a tight seal while reducing the driving force required for the extension tube to move.

[0076] When the flexible sealing ring 5 moves relative to the extension tube body, the annular protrusions form a multi-scraping structure on the outer wall of the extension tube body, which can effectively remove residues from the outer surface of the extension tube body. At the same time, the structure of multiple annular protrusions also reduces the risk of wear caused by residue accumulation.

[0077] In some possible embodiments, please refer to Figure 1 The lower end of the fixed tube body 2 is provided with a limiting sealing structure, which includes a limiting protrusion and a sealing ring 12. The limiting protrusion is located at the lower end of the fixed tube body 2 and protrudes inward. The sealing ring 12 is fixedly connected to the inner side of the limiting protrusion, and the inner wall of the sealing ring 12 is attached to the outer wall of the extension tube body.

[0078] The upper end of the extension tube has a folded edge structure that extends outward. When the extension tube extends downward to the lowest point, the folded edge structure overlaps the limiting protrusion of the fixed tube 2 to prevent the extension tube from coming off the lower end of the fixed tube 2.

[0079] A gap is formed between the inner wall of the limiting protrusion and the outer wall of the extension tube. A sealing ring 12 is installed in this gap. The outer wall of the sealing ring 12 is fixedly connected to the limiting protrusion. The connection method can refer to the connection method between the flexible sealing ring 5 and the sheath tube 1.

[0080] The outer wall of the sealing ring 12 fits against the outer wall of the extension tube body to seal the extension tube body. The sealing ring 12 and the flexible sealing ring 5 can adopt the same structure and material.

[0081] In some possible embodiments, the extension tube may employ a structure in which multiple tubes are sequentially and telescopically connected. When the extension tube comprises two tubes, see [reference needed]. Figure 1 , Figure 3 and Figure 4 The extension tube includes an intermediate tube 6, a traction tube 7, and an auxiliary sealing ring. The intermediate tube 6 is slidably disposed on the inner side of the fixed tube 2; the flexible sealing ring 5 is attached to the outer side wall of the intermediate tube 6; the traction tube 7 is slidably disposed on the inner side of the intermediate tube 6, and the sampling head 8 is installed at the lower end of the traction tube 7; the outer side of the auxiliary sealing ring is fixed to the inner side of the lower end of the intermediate tube 6, and the inner side of the auxiliary sealing ring is attached to the outer side wall of the traction tube 7.

[0082] The traction tube 7, intermediate tube 6, and fixed tube 2 are nested together. The intermediate tube 6 slides with the fixed tube 2, and the upper end of the intermediate tube 6 has a folded edge structure. The lower end of the fixed tube 2 has a limiting protrusion and a sealing ring 12 that mate with the folded edge structure of the intermediate tube 6. The connection between the traction tube 7 and the intermediate tube 6 is the same as described above. The upper end of the traction tube 7 has a folded edge structure extending outward, and the lower end of the intermediate tube 6 has a limiting protrusion extending inward. The limiting protrusion of the intermediate tube 6 is used to prevent the traction tube 7 from coming off the lower end of the intermediate tube 6.

[0083] An auxiliary sealing ring is installed on the inner side of the limiting protrusion. The installation method of the auxiliary sealing ring can refer to the installation method of the flexible sealing ring 5, and the material of the auxiliary sealing ring can refer to the material of the flexible sealing ring 5. The longitudinal cross-section of the auxiliary sealing ring can be rectangular, and the inner wall of the auxiliary sealing ring is used to fit against the traction tube 7. When the traction tube 7 moves longitudinally retracted, the inner wall of the auxiliary sealing ring fits against the outer wall of the traction tube 7 to scrape away any residue on the outer wall of the traction tube 7.

[0084] A sampling head 8 is installed at the bottom of the traction tube 7, and the upper end of the sampling head 8 is sleeved and fixed to the outside of the traction tube 7. The outer diameter of the sampling head 8 is the same as the outer diameter of the intermediate tube 6. The connection between the sampling head 8 and the traction tube 7 can be achieved by a threaded fit. The sampling hole 9 opened on the sampling head 8 is located on the circumferential side wall of the sampling head 8. The lower end of the sampling head 8 has an inverted conical structure to facilitate the drainage of residues.

[0085] The contact area between the auxiliary sealing ring and the traction tube 7 is smaller than the contact area between the flexible sealing ring 5 and the intermediate tube 6, so as to ensure that the friction force on the traction tube 7 when it moves is less than the friction force on the intermediate tube 6 when it moves. Therefore, when the telescopic tube body is retracted, the traction tube 7 moves first. When the traction tube 7 moves to the point where the sampling head 8 is in contact with the intermediate tube 6, it drives the intermediate tube 6 to move upward together.

[0086] In other embodiments, the upper end of the sampling head 8 and the outer wall of the traction tube 7 can form a tapered smooth transition area to reduce the dead angle area formed by their installation.

[0087] There may also be multiple pipe bodies between the intermediate pipe 6 and the traction pipe 7, and the sealing and scraping structure between each pipe body is set with reference to the above-mentioned auxiliary sealing ring.

[0088] In some possible embodiments, please refer to Figure 7 The inner cavity of the telescopic tube is connected to the water injection structure, which is used to inject pure water into the inner cavity of the telescopic tube; the auxiliary sealing ring has a flow passage structure that allows water to flow through, and the water outlet direction of the flow passage structure is towards the traction pipe 7.

[0089] A sealing cap 16 is installed at the upper end of the telescopic tube, which seals the inner cavity of the telescopic tube. The sampling hose 4 passes through the sealing cap 16 and forms a flexible seal with it. A water injection structure, such as a water injection pipe 15, is also provided on the sealing cap 16. One end of the water injection pipe 15 is connected to an external water source, such as a pure water tank. The other end of the water injection pipe 15 extends into the inner cavity of the telescopic tube.

[0090] During sampling, both the traction pipe 7 and the intermediate pipe 6 move downwards. When the sampling head 8 at the end of the traction pipe 7 moves to the sampling height, the traction pipe 7 and the intermediate pipe 6 stop moving. During sampling or before the telescopic pipe body is retracted after sampling, one end of the water source connected to the water injection pipe 15 has a pump body. Driven by the pump body, the liquid in the water source is injected into the inner cavity of the telescopic pipe body along the water injection pipe 15 until the inner cavity of the telescopic pipe body is filled.

[0091] After sampling is completed, the traction tube 7 and the intermediate tube 6 move upward, the inner cavity of the telescopic tube is squeezed, the water pressure in the inner cavity increases, and under the action of water pressure, the liquid in the inner cavity is ejected from the flow structure on the auxiliary sealing ring. The water flow is ejected towards the outer wall of the traction tube 7 to flush the traction tube 7.

[0092] The flow-through structure includes multiple flow-through holes evenly distributed around the circumference of the auxiliary sealing ring. These holes spray towards the traction pipe 7, with the horizontal spray range covering the entire circumferential periphery of the traction pipe 7. The longitudinal spray range of the flow-through holes is no less than the movement of the traction pipe 7 within one second. Optionally, the auxiliary sealing ring may have multiple rings of radially spaced flow-through holes, with adjacent rings staggered. The longitudinal coverage of these multiple rings of flow-through holes is no less than 3 cm.

[0093] like Figure 5 As shown, to facilitate the balance of water pressure within the telescopic pipe, a retaining ring structure 13 is provided at the upper end of the traction pipe 7, and a clearance hole 14 is provided on the retaining ring structure 13. The clearance hole 14 allows water flow to pass through, so as to balance the water pressure in the upper and lower parts of the retaining ring structure 13.

[0094] There are multiple relief holes 14, which are evenly distributed along the circumference of the traction tube 7.

[0095] When the telescopic tube retracts, the traction tube 7 achieves residue cleaning through a combination of water spraying and scraping by the auxiliary sealing ring. The intermediate tube 6 and the sampling head 8 achieve residue cleaning through scraping by the flexible sealing ring 5.

[0096] In addition, the water injection pipe 15 can extend to the lower part of the fixed pipe body 2. After the telescopic pipe body is retracted, the water injection pipe 15 will draw out the residual liquid. Alternatively, the water injection pipe 15 can remain in place, and the telescopic pipe body can be completely removed to drain the water only when replacement is required.

[0097] It is important to note that, such as Figure 7 As shown, the upper end of the sheath tube 1 has an outwardly extending overlapping flange 11, and the upper end of the fixed tube body 2 also has an outwardly extending mounting flange 10. The outer diameter of the mounting flange 10 is larger than the outer diameter of the overlapping flange 11. During installation, the mounting flange 10 is fixedly connected to the flange 17 outside the sampling port of the reactor 18, limiting and pressing the overlapping flange 11 between the mounting flange 10 and the sampling port of the reactor 18. A sealing gasket 3 is installed between the overlapping flange 11 and the mounting flange 10, and the sealing cap 16 is fixedly installed on the upper end of the mounting flange 10 by bolts or other structures. During removal, only the sealing cap 16 and the mounting flange 10 need to be removed sequentially.

[0098] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An on-line sampling device for metal cleaner production, for installation in a reactor, characterized in that, include: A sheath tube (1) extends longitudinally into the sampling port of the reactor (18). The upper end of the sheath tube (1) is fixedly connected to the reactor (18), and the lower end of the sheath tube (1) extends into the inner cavity of the reactor (18). The telescopic tube includes a fixed tube (2) and an extension tube. The fixed tube (2) is inserted into the inner side of the sheath tube (1) from top to bottom. The upper end of the fixed tube (2) is connected to the upper end of the sheath tube (1), and the lower end of the fixed tube (2) is located inside the sheath tube (1). The extension tube is longitudinally moved and located inside the fixed tube (2). The lower end of the extension tube extends out from the lower end opening of the sheath tube (1). The sampling assembly includes a sampling hose (4) and a sampling head (8), wherein the sampling head (8) is connected to the lower end of the extension tube; the sampling hose (4) passes through the inner side of the extension tube, the first end of the sampling hose (4) is connected to a suction device, and the second end of the sampling hose (4) extends out from the lower end of the extension tube and communicates with the inner cavity of the sampling head (8); the outer diameter of the sampling head (8) is the same as the outer diameter of the extension tube. A flexible sealing ring (5) is located at the bottom of the sheath tube (1). The outer side of the flexible sealing ring (5) is fixedly connected to the inner wall of the sheath tube (1). The inner side of the flexible sealing ring (5) is used to fit against the outer wall of the extension tube. During the upward movement of the extension tube after sampling, the inner side of the flexible sealing ring (5) slides with the extension tube to scrape the outer wall of the extension tube and the outer wall of the sampling head (8).

2. The on-line sampling device for metal cleaner production according to claim 1, wherein The flexible sealing ring (5) includes: A sealing part, the inner wall of which is attached to the outer wall of the extension tube or the sampling head (8); The inlet is located at the lower end of the sealing part, and the inner wall of the inlet gradually slopes inward from bottom to top to form an inlet with a downward opening.

3. The on-line sampling device for metal cleaner production according to claim 1, wherein The flexible sealing ring (5) includes: Sealing ring body; Multiple annular protrusions are spaced axially on the inner sidewall of the sealing ring body, and the annular protrusions are used to seal and scrape the extension tube.

4. The on-line sampling device for metal cleaner production according to claim 1, wherein The lower end of the fixed tube (2) is provided with a limiting sealing structure, the limiting sealing structure comprising: A limiting protrusion is provided at the lower end of the fixed tube (2) and protrudes inward; A sealing ring (12) is fixedly connected to the inner side of the limiting protrusion, and the inner wall of the sealing ring (12) is attached to the outer wall of the extension tube.

5. The on-line sampling device for metal cleaner production according to claim 1, wherein The extension tube includes: The intermediate tube (6) is slidably disposed on the inner side of the fixed tube body (2); the flexible sealing ring (5) is attached to the outer side wall of the intermediate tube (6); The traction tube (7) is slidably disposed inside the intermediate tube (6), and the sampling head (8) is installed at the lower end of the traction tube (7); An auxiliary sealing ring is fixed on the inner side of the lower end of the intermediate tube (6) on its outer side, and the inner side of the auxiliary sealing ring is attached to the outer wall of the traction tube (7).

6. The on-line sampling device for metal cleaner production according to claim 5, wherein The inner cavity of the telescopic pipe body is communicated with a water injection structure, which is used for injecting pure water into the inner cavity of the telescopic pipe body. The auxiliary sealing ring is provided with a water flow structure allowing water flow, and the water outlet direction of the water flow structure is towards the traction pipe (7).

7. The on-line sampling device for metal cleaner production according to claim 6, wherein The water flow structure comprises: A plurality of water flow holes are uniformly distributed around the auxiliary sealing ring.

8. The on-line sampling device for metal cleaner production according to claim 6, wherein The upper end of the traction pipe (7) is provided with a blocking ring structure (13), and the blocking ring structure (13) is provided with a clearance hole (14).

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