Reaction kettle sampling device for resin production

Abstract

The invention relates to the technical field of reaction kettle sampling, in particular to a reaction kettle sampling device for resin production, which comprises a sampling head, a sampling container, a mounting pipe, a plurality of sampling pipes, a plurality of buoyancy one-way valves and a control valve seat, an accommodating cavity is formed between the isolation part and the sampling head; the sampling pipes are fixed on the isolation part and are communicated with the accommodating cavity, the communication positions of the sampling pipes and the reaction kettle are different in height, and each sampling pipe and the isolation part are sealed; the buoyancy one-way valves are in one-to-one correspondence with the sampling pipes; wherein the sampling head enables the sampling pipes to sample in the reaction kettle in a negative pressure mode, and the buoyancy one-way valve is used for controlling liquid in the sampling pipes to enter the accommodating cavity at the same time, so that when the reaction kettle sampling device for resin production is used for multi-layer sampling, the sampling uniformity of each layer is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of reactor sampling, in particular to a reactor sampling device for resin production. Background Art

[0002] Resin usually refers to an organic polymer that softens or melts when heated, tends to flow under external force when softened, is solid, semi-solid, or sometimes liquid at room temperature; in a broad sense, it refers to a polymer or prepolymer used as a plastic substrate. Among them, sampling and analysis is an essential testing procedure in the resin production process, mainly to detect the degree of reaction in the reactor and determine the reaction endpoint.

[0003] At present, the existing resin reactor sampling device usually uses negative pressure to extract samples, but the existing resin reactor sampling device is usually a single-tube sampling tube, which cannot achieve multi-layer sampling. For this reason, the patent document with announcement number CN207263469U discloses a reactor multi-layer vacuum sampling device. When sampling, open the vacuum ball valve on the gas phase vacuum tube, open the control valve, open the vacuum valve at the same time, close the cleaning ball valve, the vent valve and the sampling valve. At this time, the sampler is in a negative pressure state, and the reaction material enters it. When the sampling volume is reached, close the control valve and vacuum valve, open the vent valve to break the vacuum, and open the sampling valve to take out the upper layer sample in the reactor, so that the purpose of multi-layer sampling can be achieved.

[0004] However, in the above-mentioned sampling device, when sampling, since the liquid inlets of the upper sampling tube, the middle sampling tube and the bottom sampling tube are at different positions in the reactor, the liquid inlet of the upper sampling tube is located above the liquid inlet of the middle sampling tube, and the liquid inlet of the middle sampling tube is located above the liquid inlet of the bottom sampling tube. Therefore, when the control valve is opened, the sample in the upper sampling tube enters the sampler first, followed by the sample in the middle sampling tube, and finally the sample in the bottom sampling tube, resulting in the samples in the upper sampling tube, the middle sampling tube and the bottom sampling tube being unable to enter the sampler at the same time. Therefore, after the sampling is completed, the amount of samples sampled from the upper sampling tube, the middle sampling tube and the bottom sampling tube entering the sampler will be different, resulting in uneven sampling at each level.

[0005] In summary, the existing reactor sampling device cannot ensure the uniformity of sampling at each level when performing multi-level sampling, which leads to uneven sampling and affects the accuracy of the sample. Summary of the invention

[0006] In view of the shortcomings of the prior art, the present invention provides a reactor sampling device for resin production, which aims to solve the technical problem that the existing reactor sampling device cannot ensure the uniformity of sampling at each level when performing multi-level sampling, thereby resulting in uneven sampling and affecting the accuracy of the sample.

[0007] To solve the above problems, the present invention adopts the following technical solutions: A reaction kettle sampling device for resin production, comprising: The sampling head comprises a transparent tube and a sampling container, wherein a first end of the transparent tube is sealed and connected to a negative pressure control valve; the sampling container is arranged outside the transparent tube and communicated with the inner cavity of the transparent tube; A mounting tube, mounted and fixed on the reactor, wherein a first end of the mounting tube is located in the reactor, a second end of the mounting tube is located outside the reactor and is sealed and connected to a second end of the transparent tube, an isolation portion is provided at the second end of the mounting tube, and a receiving cavity is formed between the isolation portion and the transparent tube; A plurality of sampling tubes are arranged in the installation tube and distributed along the circumference of the isolation part. The first end of each sampling tube is fixed on the isolation part and communicates with the accommodating cavity. The second end of each sampling tube communicates with the reactor at different heights. Each sampling tube is sealed from the isolation part. A plurality of buoyancy check valves, each of which corresponds to each sampling tube one by one, the buoyancy check valve comprises a valve body, a buoyancy block and a support block, the valve body is fixed on the isolation part and communicated with the sampling tube, a liquid outlet hole communicated with the accommodating chamber is provided on the valve body, the conduction between the valve body and the reactor is controlled by a first control valve assembly provided on the sampling tube, the support block is fixed in the valve body, the buoyancy block is placed on the support block, a channel is provided between the outer wall of the buoyancy block and the inner wall of the valve body, and the buoyancy block can seal the liquid outlet hole; The control valve seat is arranged on the isolation part along the axial sliding seal of the mounting tube. The control valve seat is provided with a plurality of valve stems located in the accommodating cavity. Each valve stem corresponds to each liquid outlet hole one by one. The valve stem can enter and exit the valve body from the liquid outlet hole. One end of the control valve seat extends out of the mounting tube.

[0008] Beneficial effects of the present invention: When sampling, the reactor sampling device for resin production of the present invention has the valve stem of the control valve seat located above the valve body of the buoyancy one-way valve in the sampling tube, and the first control valve assembly controls the one-way flow of liquid from the reactor to the buoyancy one-way valve. Since the valve body of the buoyancy one-way valve is connected to the sampling tube, the liquid outlet on the valve body connects the valve body with the accommodating cavity, and the buoyancy block is placed on the support block in the valve body, and the support block does not affect the connection between the sampling tube and the valve body. Therefore, when the negative pressure control valve is opened, the transparent tube, the sampling tube, and the sampling container are vacuumed. Since the heights of the sampling tubes connected to the reactor are different, the liquids at each level in the reactor enter the sampling tubes under the action of negative pressure. The liquid entering the sampling tube makes the buoyancy block float to the top wall of the valve body to press against it, so as to close the liquid outlet hole on the valve body. At this time, the liquid entering each sampling tube from the reactor will stay in the valve body of each buoyancy one-way valve, so as to prevent liquids of different levels from entering the transparent tube one after another. Since one end of the control valve seat extends out of the mounting tube, the control valve seat is manually moved downward, so that each valve stem pushes the buoyancy block in each valve body to move downward. At this time, the liquid outlet holes on each valve body are opened, so that the liquid staying in each valve body will enter the transparent tube at the same time. Since the inner cavity of the transparent tube is connected with the sampling container, the liquid in the transparent tube enters the sampling container, so as to complete the uniformity of multi-level sampling. It can be seen from this that the present invention can effectively ensure the uniformity of sampling at each level when performing multi-level sampling, thereby avoiding uneven sampling and affecting the accuracy of the sample.

[0009] Furthermore, the sampling head also includes a piston, an elastic member, a first control valve and a second control valve. The piston is arranged in the transparent tube in an axial sliding seal along the transparent tube, so that the inner cavity of the transparent tube is divided into a first cavity and a second cavity. The elastic member extends along the axial direction of the transparent tube and is located in the first cavity. The two ends of the elastic member are respectively connected and fixed to the piston and the transparent tube. The inlet and outlet of the first control valve are respectively sealed and connected with the outlet of the second control valve and the first cavity, and the inlet of the second control valve is sealed and connected with the second cavity. The sampling container is arranged between the inlet of the first control valve and the outlet of the second control valve and the three are connected to each other.

[0010] Beneficial effect: The air in the sampling tube can be completely emptied before sampling, and at the same time, the liquid drawn into the transparent tube can be prevented from entering the negative pressure control valve.

[0011] Furthermore, two sliding parts are arranged on the outer wall of the buoyancy block, the two sliding parts are symmetrical about the center of the buoyancy block, and the sliding parts are in sliding contact with the inner wall of the valve body.

[0012] Beneficial effect: It is conducive to the stable movement of the buoyancy block in the valve body.

[0013] Furthermore, an L-shaped groove is provided on the isolation portion, one end of the L-shaped groove is communicated with the accommodating cavity, and the other end of the L-shaped groove extends out of the mounting tube, and the control valve seat is slidingly and sealingly connected to the L-shaped groove; a first locking mechanism is provided outside the mounting tube for locking the control valve seat to slide relative to the isolation portion.

[0014] Beneficial effect: The control valve seat can be locked on the mounting pipe.

[0015] Furthermore, the reactor sampling device for resin production of the present invention also includes a reflux pipe, which is fixed in the mounting tube, the first end of the reflux pipe is communicated with the accommodating chamber, the second end of the reflux pipe is communicated with the reactor, and the port of the second end of the reflux pipe is located above the liquid level in the reactor, and a second control valve assembly is provided on the reflux pipe for controlling the conduction between the accommodating chamber and the reactor; the sampling head also includes an atmospheric pressure control valve, the inlet of the atmospheric pressure control valve is communicated with the atmospheric pressure, and the outlet of the atmospheric pressure control valve is communicated with the first chamber.

[0016] Beneficial effect: After sampling is completed, the liquid in the sampling head can flow back into the reactor.

[0017] Furthermore, the reflux pipe includes a liquid return pipe, a liquid inlet pipe, a first U-shaped guide pipe and a second U-shaped guide pipe. The first end of the liquid return pipe is connected to the reactor, and the second end of the liquid return pipe extends axially along the mounting tube. The opposite ends of the first U-shaped guide pipe are respectively connected to the second end of the liquid return pipe and the first end of the second U-shaped guide pipe, the second end of the second U-shaped guide pipe is connected to the first end of the liquid inlet pipe, and the second end of the liquid inlet pipe extends axially along the mounting tube and is connected to the accommodating cavity.

[0018] Beneficial effect: The flow direction of the liquid in the reflux pipe can be changed.

[0019] Furthermore, a sliding sleeve is slidably provided at the second end in the mounting tube, a pushing portion is provided on the outer wall of the sliding sleeve and slides out of the mounting tube, and a mounting plate is fixed on the inner wall of the sliding sleeve; the first control valve assembly includes a first valve tube body, a first valve ball, a first sealing ring and a second sealing ring, the first valve tube body is slidably provided on the mounting plate along the axial direction of the mounting tube, the first valve tube body is slidably sleeved on the outer wall of the sampling tube and communicates with the sampling tube, a first positioning ring and a second positioning ring are respectively fixed on the two ends of the outer wall of the first valve tube body, a first spring sleeved on the first valve tube body is provided between the first positioning ring and the mounting plate, a second spring sleeved on the first valve tube body is provided between the second positioning ring and the mounting plate, a cavity connected to the first valve tube body and the sampling tube is set as a working cavity, the first sealing ring and the second sealing ring are both fixed in the sampling tube and are respectively located at the two end ports of the working cavity, the first valve ball is fixed on the inner wall of the first valve tube body and can seal the first sealing ring and the second sealing ring.

[0020] Beneficial effect: The liquid in the sampling tube can be replaced to prevent the material remaining in the sampling tube from affecting the accuracy of sample measurement.

[0021] Further, the second control valve assembly includes a second valve tube body, a second valve ball, a third spring, a fourth spring, a third sealing ring and a fourth sealing ring. The second valve tube body is slidably arranged on the mounting plate along the axial direction of the mounting tube, the second valve tube body is slidably sleeved on the outer wall of the return pipe and is connected with the return pipe, and a third positioning ring and a fourth positioning ring are fixed at both ends of the outer wall of the second valve tube body, respectively. The third spring and the fourth spring are both sleeved on the outer wall of the second valve tube body, and the two ends of the third spring are respectively abutted against the third positioning ring and the mounting plate, and the two ends of the fourth spring are respectively abutted against the fourth positioning ring and the mounting plate, and the cavity connecting the second valve tube body and the return pipe is set as a connecting cavity, the third sealing ring and the fourth sealing ring are both fixed in the return pipe, and the third sealing ring and the fourth sealing ring are respectively located at the two end ports of the connecting cavity, and the second valve ball is fixed on the inner wall of the second valve tube body and can seal the third sealing ring and the fourth sealing ring.

[0022] Beneficial effect: The air can be replaced, and the material remaining on the inner wall of the sampling tube can be discharged into the reactor, so that the material remaining on the inner wall of the sampling tube cannot enter the reactor to participate in the reaction.

[0023] Furthermore, the reactor sampling device for resin production of the present invention further comprises a second locking mechanism disposed outside the mounting tube, for locking the sliding sleeve from sliding relative to the mounting tube.

[0024] Beneficial effect: After the sliding sleeve moves to a preset position, the sliding sleeve can be locked on the mounting tube.

[0025] Furthermore, a plurality of annular grooves are provided on the outer wall of the mounting tube at intervals along its axial direction, the plurality of annular grooves correspond one-to-one to the plurality of sampling tubes, each annular groove is provided with a liquid taking port connected to the liquid inlet of each sampling tube, a sampling net is provided in the liquid taking port; a floating ring is provided in the sliding sleeve in the annular groove.

[0026] Beneficial effects: when not sampling, the liquid in the reactor is prevented from actively entering the sampling tube; at the same time, the buoyancy ring can be used to determine the liquid level in the reactor.

[0027] In summary, the beneficial effects of the resin production reactor sampling device of the present invention are as follows: 1. The resin production reactor sampling device of the present invention can ensure the uniformity of sampling at each level when performing multi-level sampling, thereby avoiding uneven sampling and affecting the accuracy of the sample.

[0028] 2. The resin production reactor sampling device of the present invention can replace the gas and empty the material remaining on the inner wall of the sampling tube, thereby preventing the residual material from entering the reactor to participate in the reaction normally.

[0029] 3. The resin production reactor sampling device of the present invention can replace the material in the sampling tube to avoid the material remaining in the sampling tube affecting the measurement accuracy.

[0030] 4. The resin production reactor sampling device of the present invention can ensure that the gas in the sampling tube is completely emptied before feeding and sampling, thereby avoiding the influence of different amounts of sampled materials in multiple sampling tubes on the sampling accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a front view of the sampling device of the reaction kettle for resin production of the present invention; Figure 2 for Figure 1 Sectional view at AA; Figure 3 for Figure 2 A schematic diagram of the enlarged structure at B in the middle; Figure 4 This is a schematic diagram of a structure in which a control valve seat is locked in a second locking hole and a sliding sleeve is locked in a fourth locking hole according to an embodiment of the present invention; Figure 5 It is a structural schematic diagram of a buoyancy one-way valve related to an embodiment of the present invention; Figure 6 It is a right side view of the sampling device of the reaction kettle for resin production of the present invention; Figure 7 for Figure 6 Sectional view at CC; Figure 8 It is a structural schematic diagram of a control valve seat according to an embodiment of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure of the reaction kettle sampling device for resin production of the present invention; Fig.10 This is a schematic structural diagram of a first valve tube body according to an embodiment of the present invention; Fig.11 for Fig.10 Sectional view at DD in the middle; Fig.12 This is a schematic structural diagram of a second valve tube body according to an embodiment of the present invention; Fig.13 for Fig.12 Sectional view at EE; Fig.14 This is a schematic diagram of the structure of the connection between the sliding sleeve and the first valve tube body and the second valve tube body according to an embodiment of the present invention; Fig.15 for Figure 1 Schematic diagram of the enlarged structure at F in the middle.

[0032] Reference numerals in the accompanying drawings: 1. Sampling head; 10. Transparent tube; 101. First cavity; 102. Second cavity; 11. Sampling container; 12. Negative pressure control valve; 13. Piston; 14. Elastic member; 15. First control valve; 16. Second control valve; 17. Atmospheric pressure control valve; 2. Mounting tube; 20. Mounting flange; 21. Isolation part; 210. L-shaped slide groove; 22. Annular groove; 220. Sampling net; 221. Floating ring; 23. Accommodating cavity; 24. First locking hole; 25. Second locking hole; 26. First elastic latch; 27. Third locking hole; 28. Fourth locking hole; 29. ​​Second elastic latch; 3. Sampling tube; 4. Buoyancy check valve; 40. Valve body; 41. Liquid outlet; 42. Buoyancy block; 420. Sliding part; 4 3. Support block; 5. Control valve seat; 50. Valve stem; 51. Toggle part; 6. Return pipe; 60. Liquid return pipe; 61. First U-shaped guide pipe; 62. Second U-shaped guide pipe; 63. Liquid inlet pipe; 70. First valve tube body; 701. Working chamber; 702. First positioning ring; 703. Second positioning ring; 71. First valve ball; 72. First spring; 73. Second spring; 74. First sealing ring; 75. Second sealing ring; 80. Second valve tube body; 801. Connecting chamber; 802. Third positioning ring; 803. Fourth positioning ring; 81. Second valve ball; 82. Third spring; 83. Fourth spring; 84. Third sealing ring; 85. Fourth sealing ring; 9. Sliding sleeve; 90. Pushing part; 91. Mounting plate. DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] Please refer to Figure 1-Figure 15 The present invention provides a reactor sampling device for resin production, comprising a sampling head 1, a mounting tube 2, a plurality of sampling tubes 3, a plurality of buoyancy check valves 4, a control valve seat 5, a reflux pipe 6, a first control valve assembly, a second control valve assembly, a sliding sleeve 9, a first locking mechanism, a second locking mechanism, a sampling net 220 and a floating ring 221.

[0035] Reference Figure 1 , Figure 2 and Figure 7The sampling head 1 includes a transparent tube 10, a sampling container 11, a negative pressure control valve 12, a piston 13, an elastic member 14, a first control valve 15, a second control valve 16 and an atmospheric pressure control valve 17. The first end of the transparent tube 10 is sealed and connected to the negative pressure control valve 12. The negative pressure control valve 12 is used to connect a negative pressure device (not shown) that generates negative pressure. The negative pressure device can be a negative pressure pump. The piston 13 is axially slidably sealed and arranged in the transparent tube 10, so that the inner cavity of the transparent tube 10 is divided into a first cavity 101 and a second cavity 102; the elastic member 14 is a spring, which extends along the axial direction of the transparent tube 10 and is located in the first cavity 101. The two ends of the elastic member 14 are respectively connected and fixed to the piston 13 and the transparent tube 10. The inlet and outlet of the first control valve 15 are sealed and connected with the outlet of the second control valve 16 and the first chamber 101, respectively, and the inlet of the second control valve 16 is sealed and connected with the second chamber 102. The sampling container 11 is arranged outside the transparent tube 10 and communicates with the transparent tube 10. Specifically, the sampling container 11 is arranged between the inlet of the first control valve 15 and the outlet of the second control valve 16, and the sampling container 11, the inlet of the first control valve 15 and the outlet of the second control valve 16 are connected with each other. It can be seen that when the first control valve 15 and the second control valve 16 are opened, the sampling container 11, the first chamber 101 and the second chamber 102 are connected with each other. In addition, the inlet of the atmospheric pressure control valve 17 is connected with the atmospheric pressure, and the outlet of the atmospheric pressure control valve 17 is connected with the above-mentioned first chamber 101.

[0036] It should be noted that, since the transparent tube 10 is transparent, the amount of liquid entering the transparent tube 10 can be observed.

[0037] Reference Figure 1 A mounting flange 20 is fixed on the outer wall of the mounting tube 2, and the mounting tube 2 is mounted and fixed on the reactor (not shown) through the mounting flange 20. Of course, the first end of the mounting tube 2 is located inside the reactor, and the second end of the mounting tube 2 is located outside the reactor, and the second end of the mounting tube 2 is sealed and connected to the second end of the transparent tube 10. In addition, a partition 21 is circumferentially arranged at the second end of the mounting tube 2, and a receiving cavity 23 is formed between the partition 21 and the transparent tube 10. In addition, referring to Figure 2-Figure 4 and Fig. 9 The isolation part 21 is provided with an L-shaped chute 210, one end of which is in communication with the accommodating chamber 23, and the other end of which extends out of the mounting tube 2. The L-shaped chute 210 is mainly used to mount the control valve seat 5. In addition, a plurality of annular grooves 22 are provided on the outer wall of the mounting tube 2 along the axial direction thereof, and the plurality of annular grooves 22 correspond to the plurality of sampling tubes 3 one by one, and a liquid taking port is provided in each annular groove 22.

[0038] Reference Figure 1 and Figure 2, multiple sampling tubes 3 are arranged in the installation tube 2. In this embodiment, five sampling tubes 3 are arranged but not limited thereto, and multiple sampling tubes 3 are distributed circumferentially along the above-mentioned isolation part 21. The first end of each sampling tube 3 is fixed on the isolation part 21 and communicates with the accommodating cavity 23, and each sampling tube 3 is sealed with the isolation part 21. The second end port of each sampling tube 3 is communicated with the liquid collection port on each annular groove 22. Since each annular groove 22 is at a different height in the reactor, the second end of each sampling tube 3 is connected to the reactor at a different height, so that the sampling device for the reactor for resin production of the present invention can adapt to liquid level sampling at different heights.

[0039] Reference Figure 2-Figure 5 , multiple buoyancy check valves 4 correspond to multiple sampling tubes 3 one by one, and the structures of each buoyancy check valve 4 are the same. Specifically, the buoyancy check valve 4 includes a valve body 40, a buoyancy block 42 and a support block 43. The valve body 40 is a cylindrical structure. The valve body 40 is fixed on the isolation part 21 and communicates with the sampling tube 3. The valve body 40 of each buoyancy check valve 4 is coaxially arranged with each sampling tube 3. The inner diameter of the valve body 40 is larger than the inner diameter of the sampling tube 3. The valve body 40 is provided with a liquid outlet 41 communicated with the accommodating cavity 23. The inner diameter of the liquid outlet 41 is smaller than the inner diameter of the sampling tube 3. The support block 43 is fixed in the valve body 40. The buoyancy block 42 is placed on the support block 43. There is a channel between the outer wall of the buoyancy block 42 and the inner wall of the valve body 40. The outer diameter of the buoyancy block 42 is larger than the inner diameter of the liquid outlet 41, so that the buoyancy block 42 can seal the liquid outlet 41. In addition, two sliding parts 420 are provided on the outer wall of the buoyancy block 42 . The two sliding parts 420 on the buoyancy block 42 are symmetrical about the center of the buoyancy block 42 . The sliding parts 420 are in sliding contact with the inner wall of the valve body 40 , which is beneficial for the buoyancy block 42 to move stably in the valve body 40 .

[0040] Reference Figure 2-Figure 4 The control valve seat 5 is axially slidably sealed and arranged on the L-shaped slide groove 210 of the isolation part 21 along the mounting tube 2. The first end of the control valve seat 5 extends out of the mounting tube 2. The second end of the control valve seat 5 is provided with a plurality of valve stems 50 located in the accommodating cavity 23. The plurality of valve stems 50 are distributed along the circumference of the isolation part 21. Each valve stem 50 corresponds to each liquid outlet hole 41. Of course, the valve stem 50 can enter and exit the valve body 40 from the liquid outlet hole 41. By moving the control valve seat 5 upward, each valve stem 50 extends out of the inner cavity of each valve body 40 from each liquid outlet hole 41. By moving the control valve seat 5 downward, each valve stem 50 extends into each valve body 40 from each liquid outlet hole 41. In order to facilitate the up and down movement of the control valve seat 5, a toggle portion 51 is provided on one end of the control valve seat 5 extending out of the mounting tube 2. The toggle portion 51 is integrally connected with the control valve seat 5.

[0041] Reference Figure 1 , Figure 8 and Fig. 9The first locking mechanism is arranged outside the mounting tube 2, and is mainly used to lock the control valve seat 5 to slide relative to the isolation portion 21. Specifically, the first locking mechanism includes a first elastic latch 26 and at least two locking holes, the two locking holes are respectively a first locking hole 24 and a second locking hole 25, the locking hole is opened at one end of the L-shaped slide groove 210 communicating with the outside of the mounting tube 2, the first locking hole 24 and the second locking hole 25 are arranged at intervals along the axial direction of the mounting tube 2, and a toggle portion 51 is arranged on the end of the control valve seat 5 extending outside the mounting tube 2, the first elastic latch 26 is fixed on the toggle portion 51, and the first elastic latch 26 is used to lock and cooperate with the first locking hole 24 or the second locking hole 25. Specifically, it can be understood that when the valve stem 50 extends out of the valve body 40 from the position of the liquid outlet hole 41, the first elastic pin 26 is inserted into the first locking hole 24, locks the control valve seat 5 on the isolation part 21, and locks the control valve seat 5 to slide relative to the isolation part 21; when the valve stem 50 extends into the valve body 40 from the position of the liquid outlet hole 41, the first elastic pin 26 is inserted into the second locking hole 25, locks the control valve seat 5 on the isolation part 21, and locks the control valve seat 5 to slide relative to the isolation part 21.

[0042] Reference Figure 2-Figure 4 and Fig. 9 The sliding sleeve 9 is slidably arranged at the second end of the mounting tube 2, and a pushing portion 90 is provided on the outer wall of the sliding sleeve 9 and slides out of the mounting tube 2. The pushing portion 90 is used to push the sliding sleeve 9 to slide axially along the mounting tube 2. In addition, a mounting plate 91 is fixed on the inner wall of the sliding sleeve 9 along its circumference.

[0043] Reference Figure 2-Figure 4 , Fig.10 , Fig.11 and Fig.14 The first control valve assembly is used to control whether the valve body 40 is connected to the reactor. The first control valve assembly is provided with a plurality of first control valve assemblies, and the plurality of first control valve assemblies correspond to the plurality of sampling tubes 3 one by one, that is, one first control valve assembly is arranged on one sampling tube 3. Among them, each first control valve assembly is mainly used to control the connection between each valve body 40 and the reactor. Specifically, the first control valve assembly includes a first valve tube body 70, a first valve ball 71, a first spring 72, a second spring 73, a first sealing ring 74 and a second sealing ring 75. The first valve tube body 70 is axially slidably penetrated through the mounting plate 91 along the mounting tube 2, and the first positioning ring 702 and the second positioning ring 703 are fixed at both ends of the outer wall of the first valve tube body 70, respectively. The first spring 72 and the second spring 73 are both sleeved on the outer wall of the first valve tube body 70, and the two ends of the first spring 72 are respectively in contact with the first positioning ring 702 and the mounting plate 91, and the two ends of the second spring 73 are respectively in contact with the second positioning ring 703 and the mounting plate 91.

[0044] Of course, the first valve tube body 70 is slidably sleeved on the outer wall of the sampling tube 3 and communicates with the sampling tube 3; the cavity in which the first valve tube body 70 communicates with the sampling tube 3 is set as a working cavity 701, the first sealing ring 74 and the second sealing ring 75 are both fixed in the sampling tube 3, and the first sealing ring 74 and the second sealing ring 75 are respectively located at the two end ports of the working cavity 701; the first valve ball 71 is fixed on the inner wall of the first valve tube body 70, and the first valve ball 71 can seal the first sealing ring 74 and the second sealing ring 75. Among them, when the first valve ball 71 seals the second sealing ring 75 (such as Figure 4 As shown in FIG. 1 ), the liquid or gas in the self-reactor can push open the first valve ball 71 to drive the first valve tube 70 to move upward, so that the second sealing ring 75 is opened, and the first valve ball 71 is not in contact with the first sealing ring 74; when the first valve ball 71 seals the first sealing ring 74 (as ... Figure 3 As shown in the figure), the liquid or gas entering the reactor from the valve body 40 can push the first valve ball 71 to drive the first valve tube 70 to move, so that the first sealing ring 74 is opened, and the first valve ball 71 is not in contact with the second sealing ring 75. In other words, it can be understood that when the push part 90 is manually pushed to drive the first valve tube 70 to move downward so that the first valve ball 71 seals the second sealing ring 75, the liquid in the valve body 40 cannot flow to the reactor, and when the liquid in the reactor enters the valve body 40, it can push the first valve ball 71 to drive the first valve tube 70 to move upward, so that the second sealing ring 75 is opened. At this time, the second spring 73 is in a compressed state, and the first valve ball 71 is not in contact with the first sealing ring 74, so that the sampling tube 3 can unidirectionally conduct the liquid from the reactor to the valve body 40; when the manual When the pushing portion 90 is pushed to drive the first valve tube body 70 to move upward so that the first valve ball 71 seals the first sealing ring 74, the liquid in the reactor cannot flow to the valve body 40 through the sampling tube 3, and the liquid or gas entering the reactor from the valve body 40 can push the first valve ball 71 to drive the first valve tube body 70 to move downward, so that the first sealing ring 74 opens. At this time, the first spring 72 is in a compressed state, and the first valve ball 71 is not in contact with the second sealing ring 75, so that the sampling tube 3 unidirectionally guides the liquid to flow from the valve body 40 to the reactor.

[0045] Reference Figure 3 and Figure 4, the reflux pipe 6 is fixed in the mounting tube 2, the first end of the reflux pipe 6 is in communication with the accommodating chamber 23, the second end of the reflux pipe 6 is in communication with the reactor, and the port of the second end of the reflux pipe 6 is located above the liquid level in the reactor. Specifically, the reflux pipe 6 includes a liquid return pipe 60, a liquid inlet pipe 63, a first U-shaped guide pipe 61 and a second U-shaped guide pipe 62, the first end of the liquid return pipe 60 is connected to the reactor, the second end of the liquid return pipe 60 extends axially along the mounting tube 2, the opposite ends of the first U-shaped guide pipe 61 are respectively in communication with the second end of the liquid return pipe 60 and the first end of the second U-shaped guide pipe 62, the second end of the second U-shaped guide pipe 62 is in communication with the first end of the liquid inlet pipe 63, the second end of the liquid inlet pipe 63 extends axially along the mounting tube 2 and is in communication with the accommodating chamber 23. Among them, the first U-shaped guide pipe 61 and the second U-shaped guide pipe 62 mainly play the role of changing the flow direction of the liquid in the reflux pipe 6.

[0046] Reference Figure 2-Figure 4 and Figure 12-Figure 14 The second control valve assembly is arranged on the reflux pipe 6 to control whether the reflux pipe 6 is connected with the accommodating chamber 23 and the reactor. The second control valve assembly includes a second valve tube body 80, a second valve ball 81, a third spring 82, a fourth spring 83, a third sealing ring 84 and a fourth sealing ring 85. The second valve tube body 80 is slidably mounted on the mounting plate 91 along the axial direction of the mounting tube 2, and the second valve tube body 80 is slidably sleeved on the outer wall of the return pipe 6 and communicated with the return pipe 6. The third positioning ring 802 and the fourth positioning ring 803 are fixed at both ends of the outer wall of the second valve tube body 80, respectively. The third spring 82 and the fourth spring 83 are both sleeved on the outer wall of the second valve tube body 80, and the two ends of the third spring 82 are respectively abutted against the third positioning ring 802 and the mounting plate 91, and the two ends of the fourth spring 83 are respectively abutted against the fourth positioning ring 803 and the mounting plate 91. The cavity in which the second valve tube body 80 communicates with the return pipe 6 is set as a communicating cavity 801, and the third sealing ring 84 and the fourth sealing ring 85 are both fixed in the return pipe 6, and the third sealing ring 84 and the fourth sealing ring 85 are respectively located at the two end ports of the communicating cavity 801, and the second valve ball 81 is fixed on the inner wall of the second valve tube body 80 and can seal the third sealing ring 84 and the fourth sealing ring 85.

[0047] Among them, when the second valve ball 81 seals the fourth sealing ring 85, the liquid or gas in the reactor cannot enter the accommodating chamber 23, and the liquid or gas flowing from the accommodating chamber 23 to the reactor through the reflux pipe 6 can push the second valve ball 81 to drive the second valve tube body 80 to move upward, so that the fourth sealing ring 85 is opened, and the second valve ball 81 is not in contact with the third sealing ring 84; when the second valve ball 81 seals the third sealing ring 84, the liquid or gas in the accommodating chamber 23 cannot enter the reactor, and the liquid or gas flowing from the reactor to the accommodating chamber 23 can push the second valve ball 81 to drive the second valve tube body 80 to move downward, so that the third sealing ring 84 is opened, and the second valve ball 81 is not in contact with the fourth sealing ring 85. That is, it can be understood that when the pushing portion 90 is manually pushed to drive the second valve tube body 80 to move downward, so that the second valve ball 81 moves downward to seal the fourth sealing ring 85, the liquid or gas in the reactor cannot enter the accommodating chamber 23 through the reflux pipe 6, and the liquid or gas flowing from the accommodating chamber 23 to the reactor through the reflux pipe 6 can push the second valve ball 81 to drive the second valve tube body 80 to move upward, so that the fourth sealing ring 85 is opened; when the pushing portion 90 is manually pushed to drive the second valve tube body 80 to move upward, so that the second valve ball 81 moves upward to seal the third sealing ring 84, the liquid or gas in the accommodating chamber 23 cannot enter the reactor, and the liquid or gas flowing from the reactor to the accommodating chamber 23 through the reflux pipe 6 can push the second valve ball 81 to drive the second valve tube body 80 to move downward, so that the third sealing ring 84 is opened, and the second valve ball 81 is not in contact with the fourth sealing ring 85, so that the liquid or gas in the reactor can enter the accommodating chamber 23.

[0048] Reference Figure 2 , Figure 3 , Fig. 9 and Fig.14 The second locking mechanism is arranged outside the mounting tube 2, and is mainly used to lock the sliding sleeve 9 from sliding relative to the mounting tube 2. The second locking mechanism includes a second elastic latch 29, a third locking hole 27, and a fourth locking hole 28. The second elastic latch 29 is mainly used to lock and cooperate with the third locking hole 27 or the fourth locking hole 28, thereby locking the sliding sleeve 9 from sliding relative to the mounting tube 2.

[0049] Reference Figure 1 There are multiple sampling nets 220, and the multiple sampling nets 220 correspond to the multiple liquid taking ports one by one. Each sampling net 220 is fixed between each liquid taking port and the liquid inlet of each sampling tube 3. The function of the sampling net 220 is to prevent the liquid in the reactor from actively entering the sampling tube 3 when in a non-sampling state (referring to a state where the sampling device is not in use).

[0050] Reference Figure 1 and Fig.15There are multiple floating rings 221, and the multiple floating rings 221 correspond to the multiple annular grooves 22. Among them, each floating ring 221 is slidably sleeved in each annular groove 22, and the buoyancy ring can be used to judge the liquid level in the reactor.

[0051] The resin production reaction kettle sampling device of the present invention is divided into the following steps when in use: first, vacuuming; second, liquid replacement; third, sampling; fourth, sampling; fifth, draining; and sixth, air replacement. First, the specific steps of vacuuming are as follows: Open the negative pressure control valve 12, the first control valve 15 and the second control valve 16, and close the atmospheric pressure control valve 17. At this time, the valve stems 50 on the control valve seat 5 extend out of the valve bodies 40 (the control valve seat 5 is locked in the position of the first locking hole 24), and the first valve ball 71 abuts against the second sealing ring 75 (the sliding sleeve 9 is locked in the position of the fourth locking hole 28), so that the second sealing ring 75 is in a closed state. Under the action of negative pressure (the upper part of the first valve ball 71 is vacuum, and the lower part of the first valve ball 71 is atmospheric pressure), the first valve ball 71 drives the first valve tube 70 to move upward. And the upward movement of the first valve tube body 70 will not cause the first valve ball 71 to close the first sealing ring 74, so that the liquid in the reactor enters into each sampling tube 3, and the liquid entering into each sampling tube 3 enters into each valve body 40, so that the buoyancy block 42 in each valve body 40 moves upward to seal each liquid outlet 41, thereby preventing the liquid in the sampling tube 3 from entering the accommodating chamber 23; and when the first valve ball 71 and the second sealing ring 75 are in abutment and sealing state, the liquid entering the valve body 40 will not flow back into the reactor, so that the air in the transparent tube 10 and the sampling container 11 can be completely emptied.

[0052] Second, the specific steps of liquid replacement are as follows: Close the first control valve 15 and the second control valve 16. At this time, the control valve seat 5 is locked in the position of the second locking hole 25, and the sliding sleeve 9 is locked in the position of the fourth locking hole 28. Then open the negative pressure control valve 12 and close the atmospheric pressure control valve 17. Under the action of negative pressure, the liquid in the reactor enters each sampling tube 3 and then flows back into the reactor from the reflux pipe 6, thereby completely replacing the material in the sampling tube 3 with the material in the reactor.

[0053] It should be noted that, by repeatedly operating the liquid replacement step, that is, by repeatedly opening the negative pressure control valve 12 and the atmospheric pressure control valve 17 alternately while the first control valve 15 and the second control valve 16 are closed, the material in the sampling tube 3 can be completely replaced by the liquid in the reactor. In addition, since the material originally remaining in the sampling tube 3 is small, after the material originally remaining in the sampling tube 3 is replaced by the material in the reactor, the amount of the material originally remaining in the sampling tube 3 entering the reactor can be ignored.

[0054] Of course, the purpose of liquid replacement is to replace the material originally remaining in the sampling tube 3, so as to prevent the material originally remaining in the sampling tube 3 from affecting the accuracy of sample measurement.

[0055] Third, the specific steps of sampling are as follows: Close the first control valve 15 and the second control valve 16. At this time, the atmospheric pressure control valve 17 is in a closed state. Then open the negative pressure control valve 12, and manually push the toggle part 51 to drive the control valve seat 5 to move up and lock it in the position of the first locking hole 24. The liquid in the reactor enters the valve body 40 through the sampling tube 3 for storage. At this time, unlock the first locking mechanism, and manually push the toggle part 51 to drive the control valve seat 5 to move down and lock it in the position of the second locking hole 25, so that the liquid outlet hole 41 is opened, so that the liquid stored in each valve body 40 enters the second cavity 102 of the transparent tube 10 at the same time.

[0056] Fourth, the specific steps of sampling are as follows: The negative pressure control valve 12, the first control valve 15 and the atmospheric pressure control valve 17 are closed, and then the second control valve 16 is opened to allow the liquid in the second cavity 102 to enter the sampling container 11, thereby completing the sampling.

[0057] It should be noted that after the liquid replacement step and before the sampling step, vacuuming can be performed again to completely exhaust the air in the transparent tube 10 and the sampling container 11 again.

[0058] Fifth, the specific steps of drainage are as follows: Close the negative pressure control valve 12, the first control valve 15 and the second control valve 16, then open the atmospheric pressure control valve 17, manually push the sliding sleeve 9 upward and lock it in the position of the third locking hole 27, at this time, the first valve ball 71 is in a state of closing the first sealing ring 74 (the liquid in the second chamber 102 can enter the reactor through the sampling tube 3), and the second valve ball 81 is in a state of closing the third sealing ring 84 (the liquid in the second chamber 102 cannot provide the reflux pipe 6 to flow to the reactor), so that the liquid in the second chamber 102 will flow back to the reactor through the sampling tube 3, thereby returning the liquid in the second chamber 102 to the reactor.

[0059] It should be noted that since the resin produced by the reaction in the reactor has a certain viscosity in a fluid state, it is easy to remain on the inner wall of the sampling tube 3. Therefore, after the sampling is completed, the material remaining on the inner wall of the sampling tube 3 needs to be discharged back into the reactor to participate in the reaction to avoid affecting the reaction in the reactor.

[0060] Sixth, the specific steps of air replacement are as follows: Close the first control valve 15 and the second control valve 16. At this time, the control valve seat 5 is locked in the position of the first locking hole 24, and the sliding sleeve 9 is locked in the position of the third locking hole 27; then open the negative pressure control valve 12 and close the atmospheric pressure control valve 17. Since one end of the reflux pipe 6 located in the reactor is above the liquid level in the reactor, the air in the reactor is drawn into the second chamber 102 under the action of negative pressure, so that the elastic member 14 is in a compressed and force-storing state. At this time, open the atmospheric pressure control valve 17 and close the negative pressure control valve 12, so that the piston 13 is connected to the atmospheric pressure from top to bottom. In this way, the force stored by the elastic member 14 can push the piston 13 downward, push the gas in the second chamber 102 into each sampling tube 3, and discharge the material remaining in each sampling tube 3 into the reactor, so as to achieve the effect of cleaning and emptying the material remaining in the sampling tube 3.

[0061] It can be seen that the purpose of air replacement is to discharge the material remaining on the inner wall of the sampling tube 3 back into the reactor to participate in the reaction after the sampling is completed, so as to avoid affecting the reaction in the reactor.

[0062] In summary, when the resin production reactor sampling device of the present invention performs multi-level sampling, since the liquid in the sampling tube 3 can enter the second cavity 102 at the same time, the uniformity of sampling at each level can be ensured, and uneven sampling can be avoided, which affects the accuracy of the sample. In addition, the resin production reactor sampling device of the present invention can empty the material remaining on the inner wall of the sampling tube 3 by replacing the gas, so as to avoid the residual material from being unable to enter the reactor to participate in the reaction normally. In addition, the present invention can also replace the material in the sampling tube 3 by liquid replacement, and completely replace the material originally remaining in the sampling tube 3, so as to avoid the material remaining in the sampling tube 3 affecting the measurement accuracy.

[0063] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A reaction kettle sampling device for resin production, characterized in that: The invention comprises a sampling head, a mounting tube, a control valve seat, a plurality of sampling tubes and a plurality of buoyancy one-way valves. The sampling head comprises a transparent tube and a sampling container. The first end of the transparent tube is sealed and connected with a negative pressure control valve. The sampling container is arranged outside the transparent tube and communicated with the inside of the transparent tube. The mounting tube is mounted on the reactor. The first end of the mounting tube is located in the reactor. The second end is located outside the reactor and is sealed and connected with the second end of the transparent tube. An isolation part is arranged at the second end in the mounting tube. A containing cavity is formed between the isolation part and the transparent tube. The plurality of sampling tubes are arranged in the mounting tube and distributed along the circumference of the isolation part. The first end of each sampling tube is fixed on the isolation part and communicated with the containing cavity. The second end is connected with the reactor at different heights. Each sampling tube is sealed with the isolation part. The force check valve corresponds to each sampling tube one by one, and the buoyancy check valve includes a valve body, a buoyancy block and a support block. The valve body is fixed on the isolation part and communicated with the sampling tube. A liquid outlet communicated with the accommodating chamber is provided on the valve body. The conduction between the valve body and the reactor is controlled by a first control valve assembly arranged on the sampling tube. The support block is fixed in the valve body, and the buoyancy block is placed on the support block. A channel is provided between the outer wall of the buoyancy block and the inner wall of the valve body, and the buoyancy block can seal the liquid outlet. The control valve seat is axially slidingly sealed on the isolation part along the mounting tube, one end of the control valve seat extends out of the mounting tube, and the other end of the control valve seat is provided with a plurality of valve stems located in the accommodating chamber, each valve stem corresponds to each liquid outlet one by one, and each valve stem can enter and exit each valve body from each liquid outlet.

2. A resin production reactor sampling device according to claim 1, characterized in that: The sampling head also includes a piston, an elastic member, a first control valve and a second control valve. The piston is arranged in the transparent tube in an axial sliding seal along the transparent tube, so that the inner cavity of the transparent tube is divided into a first cavity and a second cavity. The elastic member extends along the axial direction of the transparent tube and is located in the first cavity. The two ends of the elastic member are respectively connected and fixed to the piston and the transparent tube. The inlet and outlet of the first control valve are respectively sealed and connected with the outlet of the second control valve and the first cavity, and the inlet of the second control valve is sealed and connected with the second cavity. The sampling container is arranged between the inlet of the first control valve and the outlet of the second control valve, and the three are connected to each other.

3. A resin production reactor sampling device according to claim 1, characterized in that: Two sliding parts are arranged on the outer wall of the buoyancy block, the two sliding parts are symmetrical about the center of the buoyancy block, and the sliding parts are in sliding contact with the inner wall of the valve body.

4. A resin production reactor sampling device according to claim 1, characterized in that: An L-shaped slide groove is provided on the isolation part, one end of the L-shaped slide groove is communicated with the accommodating cavity, and the other end of the L-shaped slide groove extends out of the mounting tube, and the control valve seat is slidingly and sealingly connected to the L-shaped slide groove; a first locking mechanism is provided outside the mounting tube for locking the control valve seat to slide relative to the isolation part.

5. A resin production reactor sampling device according to claim 2, characterized in that: It also includes a reflux pipe, which is fixed in the mounting tube, the first end of which is connected to the accommodating chamber, the second end of which is connected to the reactor, and the port of the second end of the reflux pipe is located above the liquid level in the reactor, and the reflux pipe is provided with a second control valve assembly for controlling the conduction between the accommodating chamber and the reactor; the sampling head also includes an atmospheric pressure control valve, the inlet of which is connected to the atmospheric pressure, and the outlet of which is connected to the first chamber.

6. A resin production reactor sampling device according to claim 5, characterized in that: The reflux pipe includes a liquid return pipe, a liquid inlet pipe, a first U-shaped guide pipe and a second U-shaped guide pipe. The first end of the liquid return pipe is connected to the reactor, and the second end of the liquid return pipe extends axially along the mounting tube. The opposite ends of the first U-shaped guide pipe are respectively connected to the second end of the liquid return pipe and the first end of the second U-shaped guide pipe. The second end of the second U-shaped guide pipe is connected to the first end of the liquid inlet pipe. The second end of the liquid inlet pipe extends axially along the mounting tube and is connected to the accommodating cavity.

7. A resin production reactor sampling device according to claim 6, characterized in that: The cam is provided with a first sealing ring and a second sealing ring, the first valve body being ...

8. A reaction kettle sampling device for resin production according to claim 7, characterized in that: The second control valve assembly includes a second valve tube body, a second valve ball, a third spring, a fourth spring, a third sealing ring and a fourth sealing ring. The second valve tube body is slidably arranged on the mounting plate along the axial direction of the mounting tube, the second valve tube body is slidably sleeved on the outer wall of the return pipe and is connected to the return pipe, and a third positioning ring and a fourth positioning ring are fixed at both ends of the outer wall of the second valve tube body, respectively. The third spring and the fourth spring are both sleeved on the outer wall of the second valve tube body, and the two ends of the third spring are respectively abutted against the third positioning ring and the mounting plate, and the two ends of the fourth spring are respectively abutted against the fourth positioning ring and the mounting plate, and the cavity connecting the second valve tube body and the return pipe is set as a connecting cavity, the third sealing ring and the fourth sealing ring are both fixed in the return pipe, and the third sealing ring and the fourth sealing ring are respectively located at the two end ports of the connecting cavity, and the second valve ball is fixed on the inner wall of the second valve tube body and can seal the third sealing ring and the fourth sealing ring.

9. A sampling device for a reaction kettle for resin production according to claim 7, characterized in that: It also includes a second locking mechanism arranged outside the mounting tube, which is used to lock the sliding sleeve from sliding relative to the mounting tube.

10. The reaction kettle sampling device for resin production according to claim 1, characterized in that: The outer wall of the mounting tube is provided with a plurality of annular grooves spaced apart along its axial direction, the plurality of annular grooves corresponding to the plurality of sampling tubes one by one, each of the annular grooves is provided with a liquid taking port connected to the liquid inlet of each sampling tube, a sampling net is arranged in the liquid taking port; a floating ring is arranged in the sliding sleeve of the annular groove.

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