A kind of online vacuum sampling equipment for polyester polyol kettle

Abstract

The present invention relates to the field of vacuum sampling technology, and in particular to an online vacuum sampling device for a polyester polyol kettle, comprising a main body, an upper cover and a pressure gauge, wherein the upper cover is fixedly installed on the top of the main body, the pressure gauge is fixedly installed on the top of the upper cover, the side wall and the bottom of the main body are respectively fixedly installed with a feed pipe and a discharge pipe, the side wall of the main body is fixedly installed with an external branch pipe, the external branch pipe is located between the feed pipe and the discharge pipe, and the side wall of one end of the external branch pipe is fixedly installed on the outside of the main body. By intercepting the reaction liquid flowing inside the external branch pipe through a movable valve stem, it can be ensured that sampling is directly performed during the process of stirring the reaction liquid inside the main body, by the movement of piston two, it can be ensured that the pressure inside the main body is always constant during the sampling process and after the sampling is completed, by the extrusion of piston one and the extraction of piston two, it can be ensured that the reaction liquid inside the sampling tube can be completely drawn into the interior of the sampling tank after the sampling is completed.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum sampling, in particular to an online vacuum sampling device for a polyester polyol kettle. Background Art

[0002] With the rapid development of my country's economy, the demand for polyester polyols in the chemical industry is increasing. Polyester polyols are widely used in chemical, construction, coatings, textiles and other fields. In the production process of polyester polyols, the reactor is the core equipment, and its operating status is directly related to the product quality and output. In order to ensure the stability of the production process and the quality of the product, vacuum sampling equipment plays an important role in the production process of polyester polyols. Early sampling equipment mainly used manual operation, which not only had safety hazards, but also was time-consuming and labor-intensive. At present, the reactor vacuum sampling equipment has formed a relatively complete technical system, which is mainly composed of a sampling tank, a sampling pipeline and multiple valves. For example, a fixed reactor liquid closed sampler in the publication number: CN219736908U, when in use, open the inlet valve, outlet valve and needle valves at both ends of the seamless steel cylinder of the medium in turn. Let the sample circulate for two minutes. After the circulation is completed, close the outlet valve. After the pressure gauge reading stabilizes, close the needle valves at both ends of the seamless steel cylinder and the inlet valve of the medium in turn, open the pressure relief valve and the outlet valve. Finally, after the system pressure drops to normal pressure, press the quick connector, remove the seamless steel cylinder, close the pressure relief valve and the outlet valve, and the sampling is completed. Although this sampler can perform vacuum sampling, the sample needs to be circulated before sampling. The residual reaction liquid in the sampling pipeline is replaced by circulation, and sampling is performed after the replacement is completed. After the replacement, the residual reaction liquid in the sampling pipeline is discharged into the reactor again, resulting in adverse effects on the mixed reaction liquid in the reactor. Moreover, during sampling, as the reaction liquid is discharged, the high pressure inside the reactor will decrease, thereby affecting the mixing of the reaction liquid inside the reactor. It cannot be guaranteed that the reaction liquid after sampling is not affected by sampling. Summary of the invention

[0003] The purpose of the present invention is to solve the problems in the background technology and to propose an online vacuum sampling device for a polyester polyol kettle.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A polyester polyol kettle online vacuum sampling device, comprising a main body, an upper cover and a pressure gauge, wherein the upper cover is fixedly installed on the top of the main body, the pressure gauge is fixedly installed on the top of the upper cover, the side wall and the bottom of the main body are respectively fixedly installed with a feed pipe and a discharge pipe, the side wall of the main body is fixedly installed with an external branch pipe, the external branch pipe is located between the feed pipe and the discharge pipe, the side wall of one end of the external branch pipe is fixedly installed on the outside of the main body, the side wall of the other end of the external branch pipe is fixedly installed with an extraction pump 1, the extraction pump 1 is fixedly installed on the outside of the main body, the side wall of the main body is fixedly installed with an external air pipe, the external air pipe The side wall at one end is fixedly installed on the outside of the main body, and the side wall at the other end of the external air pipe is fixedly installed with an extraction pump 2, the external air pipe is located between the external branch pipe and the main body, and the connection between the external air pipe and the main body is located above the feed pipe, and the extraction pump 2 is located below the external branch pipe. A connecting pipe is fixedly installed on the top of the extraction pump 2, and a sampling tube is integrally formed on the side wall of the external branch pipe, and a sampling tank is fixedly installed between the connecting pipe and the sampling tube, a motor 1 is fixedly installed on the top of the upper cover, and a stirring rod is rotatably installed inside the main body, and the output shaft of the motor 1 and the stirring rod are fixedly connected.

[0006] In the above-mentioned online vacuum sampling equipment for a polyester polyol kettle, a piston 2 is slidably installed inside the sampling tank, a screw 1 and a screw 2 are respectively integrally formed on the top and the bottom of the sampling tank, and a fixing nut 1 and a fixing nut 2 are respectively movably mounted on the side walls of the sampling tube and the connecting tube, and the screw 1 and the fixing nut 1 are threadedly matched, and the screw 2 and the fixing nut 2 are threadedly matched.

[0007] In the above-mentioned online vacuum sampling equipment for a polyester polyol kettle, a sealing gasket 1 is fixedly installed on the side wall of the sampling tube, a sealing block is slidably installed on the side wall of the screw 1, the sealing block is located below the sealing gasket 1, a spring 2 is provided between the sealing block and the side wall of the screw 1, a sealing gasket 2 is fixedly installed on the side wall of the connecting tube, a sealing cup is slidably installed on the side wall of the screw 2, the sealing cup is located above the sealing gasket 2, and a spring 3 is provided between the sealing cup and the side wall of the screw 2.

[0008] In the above-mentioned online vacuum sampling equipment for a polyester polyol kettle, a sampling valve is rotatably installed on the side wall of the external branch pipe, a valve body is fixedly installed on the bottom of the sampling valve, the valve body is located inside the external branch pipe, a piston is slidably installed on the bottom of the valve body, the piston is slidably installed inside the sampling tube, two movable valve stems are rotatably installed on the side wall of the valve body, a stopper is integrally formed on the side wall of the valve body, and the stopper is located between the two movable valve stems.

[0009] In the above-mentioned polyester polyol kettle online vacuum sampling equipment, the side wall of the external branch pipe is integrally formed with a lifting drum, the side wall of the sampling valve is integrally formed with a sliding rod 1, the sliding rod 1 is slidably installed on the side wall of the lifting drum, and a spring 1 is provided between the piston 1 and the bottom of the valve body.

[0010] In the above-mentioned polyester polyol kettle online vacuum sampling equipment, the side wall of the valve body is integrally formed with an arc support rod, and the movable valve stem is rotatably installed at both ends of the arc support rod. The side walls of the arc support rod and the movable valve stem are respectively provided with a plurality of evenly distributed guide holes 1 and guide holes 2, and the axes of the guide holes 1 and guide holes 2 are both inclined toward the axis of the external branch pipe. A guide plate is welded to the side wall of the valve body, and the guide plate is located between the two movable valve stems.

[0011] In the above-mentioned online vacuum sampling equipment for a polyester polyol kettle, a spread piece 1 is rotatably installed on the top of the movable valve stem, and a slide rod 2 is integrally formed on the side wall of the spread piece 1. Spread pieces 2, 3 and 4 are rotatably installed inside the valve body, and the slide rod 2 is rotatably installed on the side wall of the spread piece 4. The side walls of the spread pieces 2 and 3 are respectively integrally formed with a slide groove 1 and a slide groove 2, and the slide rod 2 is slidably installed inside the slide groove 1 and the slide groove 2.

[0012] In the above-mentioned polyester polyol kettle online vacuum sampling equipment, a vent pipe is integrally formed at the bottom of the external air pipe, and the vent pipe is located below the extraction pump 2. Valve 1 and valve 2 are rotatably installed on the side wall of the external air pipe, and valve 1 is located inside the external air pipe, and valve 2 is located inside the vent pipe.

[0013] Compared with the prior art, the advantages of the present invention are:

[0014] 1. The present invention cooperates between the valve body and the movable valve stem. When sampling is performed, the sampling valve is opened, the sampling valve drives the valve body to move upward, the valve body drives piston one to move upward, piston one opens the sampling tube, so that the reaction liquid volume chamber of the sampling tank and the external branch pipe are connected to each other, the valve body drives the circular arc support rod to move upward, and squeezes the movable valve stem, the movable valve stem expands expansion piece 1 to expansion piece 2, expansion piece 3 and expansion piece 4, so that the space between the movable valve stem and the circular arc support rod is reduced, the reaction liquid inside the external branch pipe is intercepted, the intercepted reaction liquid flows into the reaction liquid volume chamber of the sampling tank through the sampling tube, the reaction liquid flowing inside the external branch pipe is intercepted by the movable valve stem, and it can be ensured that sampling can be directly performed during the process of stirring the reaction liquid inside the body.

[0015] 2. The present invention cooperates between the extraction pump 2 and the piston 2. When sampling is performed, the valve 1 and the extraction pump 2 are opened. By opening the valve 1, the high-pressure vacuum chamber inside the sampling tank is connected to the main body through the external air pipe. When the extraction pump 2 drives the piston 2 to move, the piston 2 moves toward the sealing cup, and the piston 2 extracts the reaction liquid inside the external branch pipe and pressurizes the inside of the main body at the same time, so that the pressure inside the main body is constant when sampling is performed, and the pressure inside the main body remains constant after the sampling is completed. Through the movement of the piston 2, it can be ensured that the pressure inside the main body is always constant during and after the sampling process.

[0016] 3. The present invention cooperates between piston 2 and piston 1. After sampling is completed, the sampling valve and valve 1 are closed, and valve 2 is opened. At this time, the high-pressure vacuum chamber inside the sampling tank is connected to the outside to release pressure. Through the extraction of extraction pump 2 and the pressure release of the high-pressure vacuum chamber, piston 2 continues to move toward the sealing cup and extracts the remaining reaction liquid inside the sampling tube. During the extraction process of piston 2, piston 1 slides toward the sampling tank, so that the reaction liquid inside the sampling tube flows into the interior of the sampling tank. Through the squeezing of piston 1 and the extraction of piston 2, it can be ensured that the reaction liquid inside the sampling tube can be completely drawn into the interior of the sampling tank after sampling is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0018] Figure 2 It is a cross-sectional view of the overall structure of the present invention;

[0019] Figure 3 For the present invention Figure 2 The enlarged view of point A in the middle;

[0020] Figure 4 For the present invention Figure 2 The enlarged view of point B in the middle;

[0021] Figure 5 It is a cross-sectional view of the structure of the external branch pipe in the present invention;

[0022] Figure 6 This is a schematic diagram of disassembling the sampling tank in the present invention;

[0023] Figure 7 It is a structural schematic diagram of the sampling valve and the valve body in the present invention;

[0024] Figure 8 It is a working schematic diagram of the movable valve stem and the valve body in the present invention;

[0025] Fig. 9 It is a structural schematic diagram of the valve body in the present invention;

[0026] Fig.10It is a structural schematic diagram of the movable valve stem in the present invention;

[0027] Fig.11 It is a schematic diagram of the structures of the first, second, third and fourth expansion pieces in the present invention.

[0028] In the figure: 1, main body; 11, upper cover; 111, pressure gauge; 121, feed pipe; 122, discharge pipe; 131, external branch pipe; 132, extraction pump 1; 133, lifting drum; 134, sampling tube; 135, fixing nut 1; 136, sealing gasket 1; 141, stirring rod; 142, motor 1; 151, external air pipe; 152, valve 1; 153, valve 2; 154, extraction pump 2; 155, connecting pipe; 156, fixing nut 2; 157, sealing gasket 2; 158, vent pipe; 21, sampling valve; 211, sliding rod 1; 22, valve body; 221, piston 1; 222, arc support rod; 223, guide hole 1; 224, guide plate; 225, stopper; 226, spring 1; 23, movable valve stem; 231, guide hole 2; 232, extension piece 1; 233, extension piece 2; 234, extension piece 3; 235, extension piece 4; 236, slide 1; 237, slide 2; 238, slide rod 2; 31, sampling tank; 311, sealing block; 312, spring 2; 313, screw 1; 314, screw 2; 315, spring 3; 316, sealing cup; 317, piston 2. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0030] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] Reference Figure 1 - Fig.11As shown, an online vacuum sampling device for a polyester polyol kettle comprises a main body 1, an upper cover 11 and a pressure gauge 111, the upper cover 11 is fixedly mounted on the top of the main body 1, the pressure gauge 111 is fixedly mounted on the top of the upper cover 11, a feed pipe 121 and a discharge pipe 122 are fixedly mounted on the side wall and the bottom of the main body 1, an external branch pipe 131 is fixedly mounted on the side wall of the main body 1, the external branch pipe 131 is located between the feed pipe 121 and the discharge pipe 122, the side wall of one end of the external branch pipe 131 is fixedly mounted on the outside of the main body 1, an extraction pump 132 is fixedly mounted on the side wall of the other end of the external branch pipe 131, the extraction pump 132 is fixedly mounted on the outside of the main body 1, an external air pipe 151 is fixedly mounted on the side wall of the main body 1, one end of the external air pipe 151 The side wall is fixedly installed on the outside of the main body 1, and the side wall of the other end of the external air pipe 151 is fixedly installed with an extraction pump 2 154, the external air pipe 151 is located between the external branch pipe 131 and the main body 1, and the connection between the external air pipe 151 and the main body 1 is located above the feed pipe 121, the extraction pump 2 154 is located below the external branch pipe 131, and a connecting pipe 155 is fixedly installed on the top of the extraction pump 2 154, and a sampling tube 134 is integrally formed on the side wall of the external branch pipe 131, and a sampling tank 31 is fixedly installed between the connecting pipe 155 and the sampling tube 134, and a motor 142 is fixedly installed on the top of the upper cover 11, and a stirring rod 141 is rotatably installed inside the main body 1, and the output shaft of the motor 142 and the stirring rod 141 are fixedly connected.

[0032] Among them, the working principle of the external branch pipe 131 is as follows: the external branch pipe 131 is inclined at the side wall of the main body 1, and the connection between the external branch pipe 131 and the main body 1 is higher than the connection between the extraction pump 132 and the main body 1. When the motor 142 and the extraction pump 132 are started, the stirring rod 141 stirs, and the stirring direction of the stirring rod 141 is the same as the inclined direction of the external branch pipe 131. The extraction pump 132 extracts the reaction liquid inside the main body 1, so that the reaction liquid passes through the inside of the external branch pipe 131 and then flows into the inside of the main body 1, thereby improving the circulation and mixing effects of the reaction liquid.

[0033] like Figure 3-Figure 6As shown, a piston 2 317 is slidably installed inside the sampling tank 31, a screw 1 313 and a screw 2 314 are formed integrally on the top and bottom of the sampling tank 31, and a fixing nut 1 35 and a fixing nut 2 156 are movably mounted on the side walls of the sampling tube 134 and the connecting tube 155, respectively. The screw 1 313 and the fixing nut 1 135 are threadedly matched, and the screw 2 314 and the fixing nut 2 156 are threadedly matched. A sealing gasket 1 1 is fixedly installed on the side wall of the sampling tube 134. 36. A sealing block 311 is slidably mounted on the side wall of the screw rod 1 313. The sealing block 311 is located below the sealing gasket 136. A spring 2 312 is provided between the sealing block 311 and the side wall of the screw rod 1 313. A sealing gasket 2 157 is fixedly mounted on the side wall of the connecting tube 155. A sealing cup 316 is slidably mounted on the side wall of the screw rod 2 314. The sealing cup 316 is located above the sealing gasket 2 157. A spring 315 is provided between the sealing cup 316 and the side wall of the screw rod 2 314.

[0034] Among them, the working principle of the sampling tank 31 is: when the sampling tank 31 is fixed by fixing nut 135 and fixing nut 2 156, sealing gasket 136 and sealing gasket 2 157 respectively contact the sealing block 311 and the sealing cup 316, so that the sealing block 311 and the sealing cup 316 contact the spring 2 312 and the spring 315, and open the sampling tank 31, wherein the reaction liquid chamber is between piston 2 317 and the sealing block 311, and the high-pressure vacuum chamber is between piston 2 317 and the sealing cup 316.

[0035] Further references Figure 3 and Figure 4 To explain, the working principle of the extraction pump 154 ​​is as follows: when the sampling tank 31 is fixed, the extraction pump 154 ​​is started, the extraction pump 154 ​​extracts the high-pressure vacuum chamber, and the piston 317 moves toward the sealing cup 316, so that the piston 317 extracts the reaction liquid inside the external branch pipe 131.

[0036] like Figure 3 , Figure 5 and Figure 7 As shown, a sampling valve 21 is rotatably mounted on the side wall of the external branch pipe 131, a valve body 22 is fixedly mounted on the bottom of the sampling valve 21, the valve body 22 is located inside the external branch pipe 131, a piston 221 is slidably mounted on the bottom of the valve body 22, the piston 221 is slidably mounted inside the sampling tube 134, two movable valve stems 23 are rotatably mounted on the side wall of the valve body 22, a stopper 225 is integrally formed on the side wall of the valve body 22, the stopper 225 is located between the two movable valve stems 23, a lifting drum 133 is integrally formed on the side wall of the external branch pipe 131, a sliding rod 211 is integrally formed on the side wall of the sampling valve 21, the sliding rod 211 is slidably mounted on the side wall of the lifting drum 133, a spring 226 is provided between the piston 221 and the bottom of the valve body 22.

[0037] The working principle of the sampling valve 21 is as follows: when sampling is performed, the sampling valve 21 is rotated, and an inclined surface is provided on the side wall of the lifting drum 133. The slide rod 211 slides on the inclined surface of the side wall of the lifting drum 133, so that the sampling valve 21 drives the valve body 22 to move upward. When the valve body 22 moves upward, it pulls the piston 221, so that the sampling tube 134 and the external branch tube 131 are connected to each other.

[0038] like Figure 7-10 As shown, the side wall of the valve body 22 is integrally formed with an arc support rod 222, and the movable valve stem 23 is rotatably installed at both ends of the arc support rod 222. The side walls of the arc support rod 222 and the movable valve stem 23 are respectively provided with a plurality of evenly distributed guide holes 1 223 and guide holes 231, and the axes of the guide holes 1 223 and the guide holes 231 are inclined toward the axis of the external branch pipe 131. The side wall of the valve body 22 is welded with a guide plate 224, and the guide plate 224 is located between the two movable valve stems 23.

[0039] Among them, the guide hole 1 223 and the guide hole 231 are twisted, and the reaction liquid rotates when passing through the guide hole 1 223 and the guide hole 231. The guide plate 224 is composed of three pieces and is tilted and rotated, so that when the reaction liquid flows inside the external branch pipe 131, it is mixed through the guidance of the guide hole 1 223, the guide hole 231 and the guide plate 224.

[0040] like Figure 7 , Figure 8 , Fig.10 and Fig.11 As shown, a spreading piece 1 232 is rotatably mounted on the top of the movable valve stem 23, and a sliding rod 238 is integrally formed on the side wall of the spreading piece 1 232. A spreading piece 233, a spreading piece 3 234 and a spreading piece 4 235 are rotatably mounted inside the valve body 22. The sliding rod 238 is rotatably mounted on the side wall of the spreading piece 4 235. The side walls of the spreading piece 233 and the spreading piece 3 234 are respectively integrally formed with a sliding groove 1 236 and a sliding groove 237. The sliding rod 238 is slidably mounted inside the sliding groove 1 236 and the sliding groove 237.

[0041] Among them, the working principle of the movable valve stem 23 is: when the valve body 22 moves upward, the arc support rod 222 and the inner wall of the external branch pipe 131 squeeze the movable valve stem 23, so that the movable valve stem 23 rotates, and the movable valve stem 23 drives the expansion piece 1 232 to move, and the expansion piece 1 232 sequentially expands the expansion piece 2 233, the expansion piece 3 234 and the expansion piece 4 235 through the sliding rod 2 238, so that the space between the movable valve stem 23 and the arc support rod 222 is reduced, and the reaction liquid inside the external branch pipe 131 is intercepted, so that the intercepted reaction liquid flows into the interior of the sampling tube 134 through the upward moving piston 1 221.

[0042] like Figure 1 , Figure 2 and Figure 4 As shown, the bottom of the external air pipe 151 is integrally formed with an air vent pipe 158, and the air vent pipe 158 is located below the extraction pump 2 154. The side wall of the external air pipe 151 is rotatably installed with valve 152 and valve 2 153. Valve 152 is located inside the external air pipe 151, and valve 2 153 is located inside the air vent pipe 158.

[0043] Among them, the working principle of valve one 152 and valve two 153 is: when the sampling tank 31 is fixed, valve one 152 is opened, so that the high-pressure vacuum chamber inside the sampling tank 31 is connected to the main body 1 through the external air pipe 151, and the extraction pump two 154 is started for extraction. When the sampling is completed, the sampling valve 21 and valve one 152 are closed, and valve two 153 is opened. The high-pressure vacuum chamber inside the sampling tank 31 is connected to the outside through the vent pipe 158 for pressure relief. Through the extraction of the extraction pump two 154, the high pressure inside the high-pressure vacuum chamber is discharged, so that the piston two 317 continues to move toward the sealing cup 316. Through the movement of the piston two 317, the piston two 317 extracts the remaining reaction liquid inside the sampling tube 134, so that the piston one 221 slides toward the sampling tank 31. Through the cooperation between the piston one 221 and the piston two 317, the reaction liquid inside the sampling tube 134 flows into the interior of the sampling tank 31.

[0044] The specific working principle and use method of the present invention are explained in detail below: start the motor 142 and the extraction pump 132, the stirring rod 141 stirs the reaction liquid in the main body 1, the extraction pump 132 extracts the reaction liquid in the main body 1, so that the reaction liquid passes through the inside of the external branch pipe 131 and flows into the inside of the main body 1 again; when sampling is required, open the sampling valve 21, the valve 152 and the extraction pump 2 154; the sampling valve 21 drives the valve body 22 to move upward, the valve body 22 drives the piston 1 221 to move upward, the piston 1 221 opens the sampling tube 134, so that the reaction liquid volume cavity of the sampling tank 31 and the external branch pipe 131 are connected to each other; the valve body 22 drives the arc support rod 222 to move upward and squeezes the movable valve stem 23; the movable valve stem 23 unfolds the expansion piece 233 and the expansion piece 3 23 through the expansion piece 1 232. 4 and the expansion piece four 235, so that the space between the movable valve stem 23 and the arc support rod 222 is reduced, the reaction liquid inside the external branch pipe 131 is intercepted, and the intercepted reaction liquid flows into the reaction liquid volume chamber of the sampling tank 31 through the sampling tube 134, and the high-pressure vacuum chamber of the sampling tank 31 and the main body 1 are connected with each other by opening the valve one 152, and the extraction of the extraction pump two 154 makes the piston two 317 move toward the sealing cup 316, so that the piston two 317 extracts the reaction liquid intercepted inside the external branch pipe 131, when the sampling is completed, the sampling valve 21 and the valve one 152 are closed, and the valve two 153 is opened, so that the piston two 317 continues to move toward the sealing cup 316, and the reaction liquid remaining in the sampling tube 134 is extracted by the movement of the piston two 317, and when the piston two 317 hits the sealing cup 316, the sampling is completed.

[0045] It is further explained that the above-mentioned fixed connection should be understood in a broad sense unless otherwise clearly specified and limited. For example, it can be welding, gluing, or one-piece molding, etc., which are conventional means well known to those skilled in the art.

[0046] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A polyester polyol kettle online vacuum sampling device, comprising a main body (1), an upper cover (11) and a pressure gauge (111), characterized in that: The upper cover (11) is fixedly mounted on the top of the main body (1); the pressure gauge (111) is fixedly mounted on the top of the upper cover (11); a feed pipe (121) and a discharge pipe (122) are fixedly mounted on the side wall and the bottom of the main body (1), respectively; an external branch pipe (131) is fixedly mounted on the side wall of the main body (1); the external branch pipe (131) is located between the feed pipe (121) and the discharge pipe (122); a side wall at one end of the external branch pipe (131) is fixedly mounted on the outside of the main body (1); a side wall at the other end of the external branch pipe (131) is fixedly mounted on the side wall; the extraction pump (132) is fixedly mounted on the outside of the main body (1); an external air pipe (151) is fixedly mounted on the side wall of the main body (1); a side wall at one end of the external air pipe (151) is fixedly mounted on the outside of the main body (1); A second extraction pump (154) is fixedly mounted on the side wall of the other end of the tube (151); the external air pipe (151) is located between the external branch pipe (131) and the main body (1); the connection between the external air pipe (151) and the main body (1) is located above the feed pipe (121); the second extraction pump (154) is located below the external branch pipe (131); a connecting pipe (155) is fixedly mounted on the top of the second extraction pump (154); a sampling tube (134) is integrally formed on the side wall of the external branch pipe (131); a sampling tank (31) is fixedly mounted between the connecting pipe (155) and the sampling tube (134); a first motor (142) is fixedly mounted on the top of the upper cover (11); a stirring rod (141) is rotatably mounted inside the main body (1); and an output shaft of the first motor (142) and the stirring rod (141) are fixedly connected; A piston 2 (317) is slidably mounted inside the sampling tank (31), a screw 1 (313) and a screw 2 (314) are integrally formed at the top and bottom of the sampling tank (31), a fixing nut 1 (135) and a fixing nut 2 (156) are movably mounted on the side walls of the sampling tube (134) and the connecting tube (155), the screw 1 (313) and the fixing nut 1 (135) are threadedly matched, and the screw 2 (314) and the fixing nut 2 (156) are threadedly matched; A sampling valve (21) is rotatably mounted on the side wall of the external branch pipe (131); a valve body (22) is fixedly mounted on the bottom of the sampling valve (21); the valve body (22) is located inside the external branch pipe (131); a piston 1 (221) is slidably mounted on the bottom of the valve body (22); the piston 1 (221) is slidably mounted inside the sampling tube (134); two movable valve stems (23) are rotatably mounted on the side wall of the valve body (22); a stopper (225) is integrally formed on the side wall of the valve body (22); and the stopper (225) is located between the two movable valve stems (23); A lifting drum (133) is integrally formed on the side wall of the external branch pipe (131), a sliding rod (211) is integrally formed on the side wall of the sampling valve (21), the sliding rod (211) is slidably mounted on the side wall of the lifting drum (133), and a spring (226) is provided between the piston (221) and the bottom of the valve body (22); The side wall of the valve body (22) is integrally formed with an arc support rod (222), and the movable valve stem (23) is rotatably mounted on both ends of the arc support rod (222). The side walls of the arc support rod (222) and the movable valve stem (23) are respectively provided with a plurality of evenly distributed guide holes 1 (223) and guide holes 2 (231), and the axes of the guide holes 1 (223) and guide holes 2 (231) are inclined toward the axis of the external branch pipe (131). The side wall of the valve body (22) is welded with a guide plate (224), and the guide plate (224) is located between the two movable valve stems (23); The top of the movable valve stem (23) is rotatably mounted with a first expansion piece (232), and the side wall of the first expansion piece (232) is integrally formed with a second slide bar (238). The inside of the valve body (22) is rotatably mounted with a second expansion piece (233), a third expansion piece (234) and a fourth expansion piece (235), and the second slide bar (238) is rotatably mounted on the side wall of the fourth expansion piece (235). The side walls of the second expansion piece (233) and the third expansion piece (234) are respectively integrally formed with a first slide groove (236) and a second slide groove (237), and the second slide bar (238) is slidably mounted inside the first slide groove (236) and the second slide groove (237).

2. The polyester polyol kettle online vacuum sampling device according to claim 1, characterized in that: A sealing gasket 1 (136) is fixedly mounted on the side wall of the sampling tube (134); a sealing block (311) is slidably mounted on the side wall of the screw rod 1 (313); the sealing block (311) is located below the sealing gasket 1 (136); a spring 2 (312) is provided between the sealing block (311) and the side wall of the screw rod 1 (313); a sealing gasket 2 (157) is fixedly mounted on the side wall of the connecting tube (155); a sealing cup (316) is slidably mounted on the side wall of the screw rod 2 (314); the sealing cup (316) is located above the sealing gasket 2 (157); and a spring 3 (315) is provided between the sealing cup (316) and the side wall of the screw rod 2 (314).

3. The polyester polyol kettle online vacuum sampling device according to claim 1, characterized in that: The bottom of the external air pipe (151) is integrally formed with an air release pipe (158), and the air release pipe (158) is located below the second extraction pump (154). The side wall of the external air pipe (151) is rotatably mounted with a valve one (152) and a valve two (153), and the valve one (152) is located inside the external air pipe (151), and the valve two (153) is located inside the air release pipe (158).

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