Pneumatic closed sampling device and sampling method suitable for sulfonated phenolic resin

Abstract

The invention discloses a pneumatic closed sampling device suitable for sulfonated phenolic resin and a sampling method. The device comprises a mechanism supporting frame, a traction lifting mechanism arranged at the top of the mechanism supporting frame, a lifting closed bin and a control mechanism which are arranged on the mechanism supporting frame, a pneumatic valve arranged at the bottom of the mechanism supporting frame, and an external sampling cup, the pneumatic valve is connected with a sampling hole of the reaction kettle; the bottom of the lifting sealing bin is open, and the lifting sealing bin is in sliding connection with the mechanism supporting frame and can do lifting motion on the mechanism supporting frame. A traction piece of the traction lifting mechanism penetrates through the lifting closed bin, and the bottom of the traction piece is connected with a sampling barrel; and the barrel diameter of the sampling barrel is smaller than the valve inner diameter of the pneumatic valve. A double-sealing structure is adopted, harmful gas leakage or liquid splashing is avoided, the whole sampling process can be completed only by one operator, and the labor cost is reduced.

Description

Technical Field

[0001] This invention belongs to the field of chemical production equipment technology, specifically relating to a pneumatic closed sampling device and sampling method suitable for sulfonated phenolic resin. Background Technology

[0002] In the production of sulfonated phenolic resin, the temperature during the sulfonation reaction stage must be strictly controlled between 90-100℃. Simultaneously, the resin viscosity needs to be tested multiple times to ensure product quality meets standards. Currently, the industry commonly uses a traditional manual retrieval sampling method. The specific procedure involves the operator opening the sampling port of the reaction vessel, inserting a steel wire rope with a sampling cylinder attached into the vessel, and retrieving the liquid sample from the vessel. This sampling method has several significant problems, as follows: Firstly, the hot gas containing irritating substances such as formaldehyde inside the reactor will overflow in large quantities when the sampling port is opened, which will not only pollute the workshop environment, but also directly endanger the health of employees' respiratory system, nervous system and other physical health. Secondly, the sampling port and surrounding area are affected by the high temperature conduction inside the reactor, resulting in extremely high surface temperatures. Operators are prone to burns from contact during the sampling process. Third, the sampling tube used for sampling is prone to falling off the wire rope during use. If the falling sampling tube gets stuck on the stirring blades of the reactor, it will directly cause equipment failure, which will then render the material in the reactor unusable, resulting in raw material waste and production interruption. Fourth, steel wire ropes are prone to corrosion and breakage when used in the corrosive medium inside the reactor for a long time. If the steel wire rope and the sampling cylinder fall into the reactor together, it will further aggravate the damage to the equipment, increase maintenance costs, and prolong the production downtime.

[0003] In addition, the four types of mainstream reactor sampling devices currently on the market cannot meet the sampling requirements of sulfonated phenolic resins. The specific defects are as follows: The first type is the vacuum sampler, which uses negative pressure to achieve liquid sampling. Although it can achieve closed sampling to a certain extent, it is only suitable for clear, thin, free-flowing liquids with low concentration. Sulfonated phenolic resin has high viscosity and easily adheres to the inner wall of the vacuum sampler's pipes and core components during sampling. It is not only difficult to clean, but also solidifies rapidly at room temperature, causing pipe blockage and preventing subsequent sampling. The second type is the pump-type sampler. This type of device relies on the pump body to draw liquid, and its applicable scope is similar to that of the vacuum sampler. It is also only suitable for clear, free-flowing liquids. For viscous sulfonated phenolic resin, it will adhere to the surface of the pump chamber, pipes, and valves, and will cause blockage of components due to solidification at room temperature, making subsequent maintenance and cleaning extremely difficult, and ultimately making secondary sampling impossible. The third type is the under-vessel sampler. This type of device is installed under the reactor and uses gravity to allow the liquid in the reactor to flow naturally into the sampling tank. However, sulfonated phenolic resin is prone to solidification at room temperature, which can cause the valves and pipes of the device to be blocked. Once blocked, it is difficult to clean, which directly causes the sampling work to be unable to proceed normally. The fourth type is the automatic opening and closing type of sealed sampling device for reactors, which belongs to the rope-type sampler. Although it does not have a complex pipeline structure, its defects are more obvious: First, the sampling chamber is lifted by a single cylinder, resulting in an unbalanced lifting and lowering process. After closing, there is a gap between the sampling chamber and the flange, leading to poor sealing and inability to guarantee the airtightness of the sampling process. Second, the winch and rope are not installed on the reactor, but are 2 meters away from it. During sampling, the rope moves at high speed between the winch and the reactor. The friction between the wire rope and the pulley may generate sparks, posing a safety risk of explosion. At the same time, the high-speed movement of the wire rope may also cause mechanical injury to the operator. Third, the wire rope needs to be inserted into the sulfonated phenolic resin liquid during sampling, and it becomes contaminated with the liquid during the lifting process. The viscous material will splash into the sampling chamber and the external environment, and the viscous liquid will solidify on the surfaces of the equipment, further leading to poor sealing and failing to achieve the purpose of closed sampling; fourth, the winch with the coiled steel wire rope is 2 meters away from the reactor, and the liquid on the steel wire rope will splash and drip onto the workshop floor within this distance, causing secondary environmental pollution, which also fails to meet the requirements of closed sampling; fifth, the sampling chamber, winch, and control cabinet are all set up separately from the reactor, resulting in a chaotic equipment layout that does not meet the on-site management requirements of chemical workshops; sixth, the device uses non-explosion-proof solenoid valves, limit switches, and other accessories, which cannot be adapted to the explosion-proof environment of chemical production, posing serious safety hazards and making it unsuitable for promotion and use in chemical enterprises.

[0004] Therefore, all existing technologies and sampling devices on the market are currently unsuitable for the sampling needs in the production of sulfonated phenolic resins. Summary of the Invention

[0005] The purpose of this invention is to provide a pneumatic closed sampling device and sampling method suitable for sulfonated phenolic resins, so as to overcome the shortcomings of the prior art.

[0006] To achieve the above objectives, the technical solution provided by the present invention is as follows: A pneumatic closed sampling device for sulfonated phenolic resin includes a support frame, a traction lifting mechanism at the top of the support frame, a lifting sealed chamber and a control mechanism on the support frame, a pneumatic valve at the bottom of the support frame, and an external sampling cup; the control mechanism is electrically connected to the pneumatic valve, the traction lifting mechanism and the lifting sealed chamber; the pneumatic valve is used to connect to the sampling port of the reaction vessel. The control mechanism is located on the upper part of the structural support frame; the bottom of the lifting sealed chamber is open and slidably connected to the structural support frame, and can move up and down on the structural support frame; the traction component of the traction lifting mechanism passes through the lifting sealed chamber, and a sampling bucket is connected to the bottom of the traction component; the diameter of the sampling bucket is smaller than the inner diameter of the pneumatic valve.

[0007] Furthermore, the mechanism support frame includes a main frame and sliding connectors; The main frame consists of a square top plate and four square tubes located at the four corners of the square top plate. The square top plate has through holes for the traction component of the traction lifting mechanism to pass through. The four square tubes are connected to the top of the pneumatic valve. The sliding connector includes two lifting cylinders, two pneumatic sliders, and two sliding rods; the two sliding rods are symmetrically connected to both sides inside the main frame, and the two pneumatic sliders are respectively sleeved on the outside of the two sliding rods through sliding holes. The output ends of the two lifting cylinders are respectively fixedly connected to the two pneumatic sliders, and the two pneumatic sliders are fixedly connected to the inner wall of the lifting sealing chamber; the two lifting cylinders are electrically connected to the control mechanism.

[0008] Furthermore, the lifting and sealing chamber is a cylindrical chamber with an open bottom. The inner wall of the chamber is fixedly connected to the two pneumatic slider plates, and the top of the chamber has a pre-set sliding hole for the traction component to pass through.

[0009] Furthermore, the traction lifting mechanism includes a pneumatic winch and a Kevlar rope; The pneumatic winch is fixedly connected to the square top plate of the main frame; The Kevlar rope serves as the traction component of the traction lifting mechanism. One end of the rope is fixed to the output end of the pneumatic winch, and the other end passes through the through hole on the square top plate and the top sliding hole of the lifting and sealing chamber before connecting to the sampling bucket.

[0010] Furthermore, a seal is provided between the Kevlar rope and the sliding hole at the top of the lifting and sealing chamber.

[0011] Furthermore, the Kevlar rope has pre-set visual markings, and the outer surface of the lifting and sealing chamber is provided with a marking observation window.

[0012] Furthermore, the pneumatic valve is a double-flange pneumatic valve, with one end connected to the sampling port of the reactor used for producing sulfonated phenolic resin, and the other end connected to the bottom of the four square tubes of the main frame.

[0013] Furthermore, the sampling bucket has a bottom-inlet liquid structure, and a sealing block that automatically opens and closes based on buoyancy and gravity is provided at the bottom of the sampling bucket.

[0014] Furthermore, a top rod is provided in the middle of the sampling cup, and the position of the top rod is adapted to the sealing block at the bottom of the sampling bucket.

[0015] Meanwhile, the present invention also provides a sampling method suitable for sulfonated phenolic resins, based on the above-mentioned pneumatic closed sampling device suitable for sulfonated phenolic resins; comprising the following steps: S1. Check the connection of each component of the pneumatic sealed sampling device to ensure that the pneumatic valve is in normal opening and closing state, the traction lifting mechanism is fault-free, and the bottom of the lifting and sealing chamber is against the top of the pneumatic valve. S2. The pneumatic valve is opened by the control mechanism to establish a sampling channel between the reactor and the pneumatic sealed sampling device. Then, the traction lifting mechanism is controlled to drive the traction component to release downward, so that the sampling bucket is lowered into the reactor along with the traction component through the sampling channel. The sampling bucket is used to collect samples from the reactor. S3. The control mechanism controls the traction lifting mechanism to drive the traction component to lift upward, so that the sampling bucket is lifted into the lifting sealed chamber along with the traction component through the sampling channel. Then the control mechanism controls the pneumatic valve to close. S4. The lifting and sealing chamber is raised by the control mechanism to open the chamber door. The sample collected by the sampling bucket is then collected by the sampling cup. Finally, the lifting and sealing chamber is lowered by the control mechanism to close the chamber door and restore the pneumatic sealed sampling device to its initial state.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: (1) The present invention provides a pneumatic closed sampling device for sulfonated phenolic resin. The traction lifting structure drives the traction component, which drives the sampling bucket connected to the bottom of the traction component to enter the reaction vessel through the pneumatic valve to sample the sample. The double sealing structure of the dynamic valve and the lifting sealing chamber ensures that the reaction vessel is always in a relatively closed state during the entire sampling process, avoiding leakage of harmful gases or splashing of liquid. Because the structure has no complex pipeline structure, it fundamentally avoids the pipeline blockage problem caused by the viscosity and easy solidification of sulfonated phenolic resin at room temperature, reduces maintenance costs and operation difficulty, and eliminates the need for operators to manually contact the sampling hole and other high-temperature components of the reaction vessel, preventing burns to operators. (2) The present invention provides a pneumatic sealed sampling device suitable for sulfonated phenolic resin. It abandons the single cylinder drive mode and adopts a pneumatic slider-slide rod structure with symmetrical arrangement on both sides inside the main frame. The lifting and sealing chamber is smoothly lifted and lowered by two lifting cylinders in sync. With the sealing element between the top sliding hole of the lifting and sealing chamber and the Kevlar rope, the reliability of the lifting and sealing chamber is greatly improved. At the same time, with the sampling bucket with the bottom liquid inlet structure, the problem of harmful gas leakage or liquid splashing during the sampling process is avoided. (3) The present invention provides a sampling method for sulfonated phenolic resins. Only one operator is needed to independently control each component of the pneumatic closed sampling device for sulfonated phenolic resins through the control mechanism to complete the entire sampling process. Compared with the traditional method, the sampling time of this method is significantly shortened, which not only reduces labor costs but also saves time costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an embodiment of a pneumatic closed sampling device for sulfonated phenolic resin according to the present invention.

[0018] The attached figures are labeled as follows: 1-Double flange pneumatic valve, 2-Main frame, 3-Pneumatic slider, 4-Slide rod, 5-Lifting sealing chamber, 6-Lifting cylinder, 7-Pneumatic winch, 8-Kevlar rope, 9-Control mechanism, 91-Sealing chamber lifting button, 92-Pneumatic valve opening and closing button, 93-Pneumatic winch control switch, 10-Mounting cover, 12-Sampling bucket, 13-Reaction vessel. Detailed Implementation

[0019] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0020] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention 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 invention.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0022] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0025] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0026] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0027] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0029] Example 1 This embodiment provides a pneumatic closed sampling device suitable for sulfonated phenolic resin, including a mechanism support frame, a traction lifting mechanism set at the top of the mechanism support frame, a lifting closed chamber and control mechanism 9 set on the mechanism support frame, a double flange pneumatic valve 1 set at the bottom of the mechanism support frame, and an external sampling cup.

[0030] The mechanism's support frame includes a square top plate, four square tubes, two lifting cylinders 6, two pneumatic sliders 3, and two sliding rods 4. Both the square top plate and square tubes are made of high-strength steel to ensure the load-bearing capacity of the support frame and the structural stability of the pneumatic sealed sampling device during long-term use. The tops of the four square tubes are respectively located at the four bottom corners of the square top plate, and the square top plate has through holes. The bottoms of the four square tubes are connected to the top of the double-flange pneumatic valve 1, and the bottom of the double-flange pneumatic valve 1 is the sampling port of the reactor 13 used for producing sulfonated phenolic resin. Ensure a tight connection between the reactor 13 and the pneumatic sealed sampling device to prevent harmful gases from leaking from the connection point during sampling, while also facilitating the installation, disassembly, and maintenance of the device; two sliding rods 4 are symmetrically connected to the inner sides of the frame formed by four square tubes and a square top plate, and two pneumatic sliders 3 are respectively fitted onto the outer sides of the two sliding rods 4 through sliding holes, the output ends of the two lifting cylinders 6 are respectively fixedly connected to the two pneumatic sliders 3, and the two pneumatic sliders 3 are fixedly connected to the inner wall of the lifting sealed chamber 5; the two lifting cylinders 6 are electrically connected to the control mechanism 9.

[0031] The lifting and sealing chamber 5 is a cylindrical stainless steel chamber with an open bottom. A sliding hole is pre-set on the top of the chamber, and a high-performance rubber sealing ring is installed inside the sliding hole. The traction and lifting mechanism includes a pneumatic winch 7 and a Kevlar rope 8. The pneumatic winch 7 is explosion-proof and fixedly connected to the square top plate. One end of the Kevlar rope 8 is fixed to the output end of the pneumatic winch 7, and the other end passes through the through hole on the square top plate and the top sliding hole of the lifting and sealing chamber 5 before connecting to the sampling bucket 12. The pneumatic winch 7 is electrically connected to the control mechanism 9. Meanwhile, to facilitate observation of the descent of the sampling bucket 12, a visual mark is pre-set on the Kevlar rope 8, and a mark observation window is provided on the outer surface of the lifting and sealing chamber 5.

[0032] Example 2 Based on Example 1, the sampling barrel 12 has a bottom-inlet liquid structure and the barrel diameter is smaller than the inner diameter of the pneumatic valve. The bottom of the sampling barrel 12 is equipped with a sealing block that automatically opens and closes by buoyancy and gravity. The bottom-inlet liquid structure, together with the sealing block, ensures the smooth entry of liquid samples during sampling and prevents leakage of liquid samples after sampling. In order to adapt to the working temperature and material characteristics inside the reactor 13 and extend the service life of the sampling barrel 12, the sampling barrel 12 is made of low-temperature resistant and corrosion-resistant materials.

[0033] Example 3 Based on Example 2, in order to adapt to the sampling bucket 12 and receive the liquid sample collected by the sampling bucket 12, a top rod is provided in the middle of the sampling cup. The position and shape of the top rod are adapted to the bottom sealing block of the sampling bucket 12. The top rod pushes the sealing block upward, so that the liquid sample in the sampling bucket 12 flows out smoothly, ensuring the complete collection of the liquid sample and facilitating subsequent testing.

[0034] The control structure includes a mounting cover 10 installed on the upper part of the four square tubes, and a control panel set on the mounting cover 10. The control panel is equipped with a pneumatic winch control switch 93, a pneumatic valve opening and closing button 92, and a sealing chamber lifting button 91, which respectively control the forward and reverse rotation of the pneumatic winch 7, the opening and closing of the double flange pneumatic valve 1, and the lifting of the sealing chamber 5. Operators can control the operation of each component through the corresponding control buttons, eliminating the need to operate multiple separation cup devices separately, thus improving the convenience of operation.

[0035] Example 4 Based on the above-mentioned pneumatic closed sampling device suitable for sulfonated phenolic resins, this embodiment also provides a sampling method suitable for sulfonated phenolic resins, including the following steps: S1. Check the connection status of each component of the pneumatic sealed sampling device to ensure that the opening and closing status of the double flange pneumatic valve 1 is normal, the pneumatic winch 7 is fault-free, and the bottom of the lifting sealing chamber 5 is abutting against the top of the double flange pneumatic valve 1. S2. Press the pneumatic valve open / close button 92 on the control panel to open the double-flange pneumatic valve 1, establishing a sampling channel between the reactor 13 and the pneumatic sealed sampling device. Then, rotate the pneumatic winch control switch 93 clockwise to control the pneumatic winch 7 to rotate and drive the Kevlar rope 8 downwards, so that the sampling bucket 12 is lowered into the reactor 13 along with the Kevlar rope 8 through the sampling channel. The sampling bucket 12 is used to collect samples from the reactor 13. The lowering depth of the sampling bucket 12 is determined based on the visual markings preset on the Kevlar rope 8 and the marked observation window on the outer surface of the lifting sealed chamber 5. S3. Rotate the pneumatic winch control switch 93 counterclockwise to control the pneumatic winch 7 to drive the Kevlar rope 8 upward, so that the sampling bucket 12 is lifted into the lifting sealed chamber along with the Kevlar rope 8 through the sampling channel. Then press the pneumatic valve open / close button 92 to control the double flange pneumatic valve 1 to close. S4. Press the sealing chamber lifting button 91 to control the lifting and sealing chamber to rise, so that the chamber door opens. Then place the sampling cup below the sampling barrel 12, align the sampling cup top rod with the sealing block at the bottom of the sampling barrel 12 and lift it upwards, so that the liquid sample in the sampling barrel 12 flows smoothly into the sampling cup, completing the collection of the liquid sample. Finally, press the sealing chamber lifting button 91 again to control the lifting and sealing chamber 5 to descend, close the chamber door, and restore the pneumatic sealed sampling device to its initial state.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pneumatically controlled closed sampling device suitable for sulfonated phenolic resins, characterized in that: It includes a support frame, a traction lifting mechanism set on the top of the support frame, a lifting sealed chamber and control mechanism (9) set on the support frame, a pneumatic valve set at the bottom of the support frame, and an external sampling cup; the control mechanism (9) is electrically connected to the pneumatic valve, the traction lifting mechanism and the lifting sealed chamber (5); the pneumatic valve is used to connect to the sampling port of the reactor (13); The control mechanism (9) is located on the upper part of the structural support frame; the bottom of the lifting sealing chamber (5) is open and slidably connected to the structural support frame, and can move up and down on the structural support frame; the traction component of the traction lifting mechanism passes through the lifting sealing chamber, and the bottom of the traction component is connected to a sampling bucket (12); the diameter of the sampling bucket (12) is smaller than the inner diameter of the pneumatic valve.

2. The pneumatic closed sampling device for sulfonated phenolic resin according to claim 1, characterized in that: The mechanism support frame includes a main frame (2) and sliding connectors; The main frame (2) consists of a square top plate and four square tubes set at the four corners of the square top plate. The square top plate has through holes for the traction component of the traction lifting mechanism to pass through. The four square tubes are connected to the top of the pneumatic valve. The sliding connector includes two lifting cylinders (6), two pneumatic sliders (3), and two slide rods (4); the two slide rods (4) are symmetrically connected to both sides inside the main frame (2), the two pneumatic sliders (3) are respectively sleeved on the outside of the two slide rods (4) through sliding holes, the output ends of the two lifting cylinders (6) are respectively fixedly connected to the two pneumatic sliders (3), and the two pneumatic sliders (3) are fixedly connected to the inner wall of the lifting sealing chamber (5); the two lifting cylinders (6) are electrically connected to the control mechanism (9).

3. The pneumatic closed sampling device for sulfonated phenolic resin according to claim 2, characterized in that: The lifting and sealing chamber (5) is a cylindrical chamber with an open bottom. The inner wall of the chamber is fixedly connected to the two pneumatic sliders (3). The top of the chamber has a pre-set sliding hole for the traction component to pass through.

4. A pneumatic closed sampling device for sulfonated phenolic resin according to claim 3, characterized in that: The traction and lifting mechanism includes a pneumatic winch (7) and a Kevlar rope (8). The pneumatic winch (7) is fixedly connected to the square top plate of the main frame (2); The Kevlar rope (8) serves as the traction component of the traction lifting mechanism. One end of the rope is fixed to the output end of the pneumatic winch (7), and the other end passes through the through hole on the square top plate and the top sliding hole of the lifting sealing chamber (5) in sequence before connecting to the sampling bucket (12).

5. A pneumatic closed sampling device for sulfonated phenolic resin according to claim 4, characterized in that: A seal is provided between the Kevlar rope (8) and the sliding hole at the top of the lifting and sealing chamber (5).

6. A pneumatic closed sampling device for sulfonated phenolic resin according to claim 4, characterized in that: The Kevlar rope (8) has a pre-set visual mark, and the outer surface of the lifting and sealing chamber (5) has a mark observation window.

7. A pneumatic closed sampling device for sulfonated phenolic resin according to claim 4, characterized in that: The pneumatic valve is a double-flange pneumatic valve (1). One end of the double-flange pneumatic valve (1) is connected to the sampling hole of the reactor (13) for producing sulfonated phenolic resin, and the other end is connected to the bottom of the four square tubes of the main frame (2).

8. A pneumatic closed sampling device for sulfonated phenolic resin according to claim 1, characterized in that: The sampling bucket (12) has a bottom-inlet liquid structure, and the bottom of the sampling bucket (12) is equipped with a sealing block that automatically opens and closes by relying on buoyancy and gravity.

9. A pneumatic closed sampling device for sulfonated phenolic resin according to claim 8, characterized in that: The sampling cup has a top rod in the middle of its body, and the position of the top rod is adapted to the sealing block at the bottom of the sampling bucket (12).

10. A sampling method for sulfonated phenolic resins, based on the pneumatic closed sampling device for sulfonated phenolic resins as described in claims 1-9; characterized in that, Includes the following steps: S1. Check the connection status of each component of the pneumatic sealed sampling device to ensure that the pneumatic valve is in normal opening and closing state, the traction lifting mechanism is fault-free, and the bottom of the lifting sealing chamber (5) abuts against the top of the pneumatic valve. S2. The pneumatic valve is opened by the control mechanism (9) to establish a sampling channel between the reactor (13) and the pneumatic sealed sampling device. Then, the traction lifting mechanism is controlled to drive the traction component to release downward, so that the sampling bucket (12) is lowered into the reactor (13) along with the traction component through the sampling channel. The sampling bucket (12) is used to collect and sample the sample in the reactor (13). S3. The traction lifting mechanism is controlled by the control mechanism (9) to drive the traction component to lift upward, so that the sampling bucket (12) is lifted into the lifting sealed chamber through the sampling channel along with the traction component. Then the control mechanism (9) controls the pneumatic valve to close. S4. Control the lifting and sealing chamber to rise through the control mechanism (9) so that the chamber door opens. Then, use the sampling cup to collect the sample collected by the sampling bucket (12). Finally, control the lifting and sealing chamber (5) to fall through the control mechanism (9) to close the chamber door and restore the pneumatic sealed sampling device to its initial state.

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