Automatic sampling device for DMF (Dimethyl Formamide) rectification

Abstract

The utility model discloses a DMF (Dimethyl Formamide) rectification automatic sampling device which comprises a temporary storage tank, a liquid level sensor is arranged in the temporary storage tank and electrically connected with a PLC (Programmable Logic Controller) arranged on the outer wall of the temporary storage tank, the PLC is electrically connected with a water pump arranged on the outer wall of the temporary storage tank, and the water pump is connected with a sampling pipe assembly extending into the inner bottom of the temporary storage tank. The water pump is further connected with a liquid discharging pipe, the liquid discharging pipe is connected with a sampling bottle, the sampling bottle is connected with a concentration analysis mechanism, and the device has the advantages that automatic sampling detection can be achieved, and the working efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of chemical sampling technology, and more particularly to an automatic sampling device for DMF distillation. Background Technology

[0002] Dimethylformamide (DMF) is a colorless liquid with a faint amine odor. It is a commonly used organic solvent used in gas-liquid chromatography analysis and the extraction of acetylene and acrylonitrile for fiber drawing. Currently, DMF solution can be obtained through the recycling of DMF waste liquid. The recycling process involves the following steps: preheating, dehydration, heating, distillation, deacidification, and sampling for concentration testing. If the concentration test is passed, the solution is sent to the DMF finished product tank. If the concentration test is failed, the solution is sent to the DMF waste liquid tank for repeated recycling until the test is passed.

[0003] In the above-mentioned recycling process, sampling and testing require manual sampling of the DMF solution in the sampling tank at regular intervals, which is time-consuming, labor-intensive, and inefficient. Utility Model Content

[0004] The main purpose of this application is to provide an automatic sampling device for DMF distillation, which aims to solve the technical problem that existing DMF sampling tanks require manual sampling at regular intervals, resulting in low work efficiency.

[0005] To achieve the above objectives, this application provides an automatic sampling device for DMF distillation, including a temporary storage tank. A liquid level sensor is installed inside the temporary storage tank. The liquid level sensor is electrically connected to a PLC controller installed on the outer wall of the temporary storage tank. The PLC controller is electrically connected to a water pump installed on the outer wall of the temporary storage tank. The water pump is connected to a sampling tube assembly that extends into the bottom of the temporary storage tank. The water pump is also connected to a drain pipe, which is connected to a sampling bottle. The sampling bottle is connected to a concentration analysis mechanism.

[0006] Optionally, the bottom of the sampling bottle is higher than the water level monitored by the liquid level sensor. A first solenoid valve is connected to the bottom of the sampling bottle. The first solenoid valve is connected to a return pipe that extends into the temporary storage tank. The first solenoid valve is electrically connected to the PLC controller.

[0007] Optionally, a second solenoid valve and a third solenoid valve are connected to the bottom of the temporary storage tank. The second solenoid valve is connected to a recovery pipe, and the third solenoid valve is connected to a discharge pipe. Both the second and third solenoid valves are electrically connected to the PLC controller.

[0008] Optionally, the sampling tube assembly includes a first sampling tube connected to a water pump, a multi-way solenoid valve connected to the bottom of the first sampling tube, and multiple second sampling tubes connected to the bottom of the multi-way solenoid valve. The bottom height of each second sampling tube is different, and the multi-way solenoid valve is electrically connected to a PLC controller.

[0009] Optionally, the concentration analysis device includes a DMF solution concentration meter that extends into the sampling bottle, and the DMF solution concentration meter is connected to a concentration analyzer via wires.

[0010] Optionally, a fourth solenoid valve is connected to one side wall of the sampling bottle near the top of the sampling bottle. The fourth solenoid valve is connected to a water inlet pipe. A fifth solenoid valve is connected to the bottom of the sampling bottle. The fifth solenoid valve is connected to a drain pipe. Both the fourth and fifth solenoid valves are electrically connected to the PLC controller.

[0011] Optionally, a telescopic cylinder is provided at the top of the sampling bottle. The telescopic end of the telescopic cylinder extends into the sampling bottle and is connected to a cleaning mechanism, which is used to clean the inner wall of the sampling bottle.

[0012] Optionally, the cleaning mechanism includes a connector that is connected to the telescopic end of the telescopic cylinder. At least two connecting rods are connected to the side wall of the connector, and an annular component is connected to the other end of the connecting rods. The outer wall of the annular component is provided with multiple bristles that contact the inner wall of the sampling bottle.

[0013] Optionally, a support plate is provided on the outer wall of the temporary storage tank, and the sampling bottle is placed on the support plate.

[0014] The beneficial effects that this application can achieve are as follows:

[0015] This application uses a level sensor to detect when the DMF solution in the temporary storage tank reaches the corresponding level. The sensor then sends a signal to the PLC controller, which in turn starts the water pump to automatically extract the DMF solution from the storage tank. The DMF solution flows sequentially through the sampling tube assembly and the drain pipe into the sampling bottle. The concentration of the DMF solution can then be detected online by a concentration analysis device. Based on whether the concentration is within acceptable limits, the next step can be performed. This automated process eliminates the need for periodic manual sampling, thus improving work efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0017] Figure 1 This is a schematic diagram of the structure of an automatic sampling device for DMF distillation according to an embodiment of this application;

[0018] Figure 2 This is a schematic diagram of the sampling tube assembly in an embodiment of this application;

[0019] Figure 3 This is a schematic diagram of the sampling bottle and its related connecting accessories in an embodiment of this application.

[0020] Figure label:

[0021] 110-Temporary storage tank, 120-Level sensor, 130-PLC controller, 140-Water pump, 150-Sampling tube assembly, 151-First sampling tube, 152-Multi-port solenoid valve, 153-Second sampling tube, 160-Drain pipe, 170-Sampling bottle, 180-Concentration analysis mechanism, 181-DMF solution concentration meter, 182-Concentration analyzer, 190-First solenoid valve, 210-Reflux pipe, 220-Second solenoid valve, 230-Third solenoid valve, 240-Recovery pipe, 250-Discharge pipe, 260-Fourth solenoid valve, 270-Inlet pipe, 280-Fifth solenoid valve, 290-Drain pipe, 310-Telescopic cylinder, 320-Cleaning mechanism, 321-Connector, 322-Connecting rod, 323-Annular part, 324-Brush bristles, 330-Bearing plate.

[0022] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0024] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0025] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0026] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0027] Example

[0028] Reference Figures 1-3 This embodiment provides an automatic sampling device for DMF distillation, including a temporary storage tank 110. A liquid level sensor 120 is installed inside the temporary storage tank 110. The liquid level sensor 120 is electrically connected to a PLC controller 130 installed on the outer wall of the temporary storage tank 110. The PLC controller 130 is electrically connected to a water pump 140 installed on the outer wall of the temporary storage tank 110. The water pump 140 is connected to a sampling tube assembly 150 that extends into the bottom of the temporary storage tank 110. The water pump 140 is also connected to a drain pipe 160. The drain pipe 160 is connected to a sampling bottle 170. The sampling bottle 170 is connected to a concentration analysis mechanism 180.

[0029] In this embodiment, after the liquid level sensor 120 detects that the DMF solution in the temporary storage tank 110 has reached the corresponding liquid level, it sends a signal to the PLC controller 130 (model S7-200). The PLC controller 130 then controls the water pump 140 to start, thereby automatically drawing DMF solution from the temporary storage tank 110. The DMF solution flows into the sampling bottle 170 through the sampling tube assembly 150 and the drain pipe 160 in sequence. Then, the concentration of the DMF solution can be detected online by the concentration analysis mechanism 180. The next step can be performed based on whether the concentration is qualified. This process is automated and does not require periodic manual sampling, thus improving work efficiency.

[0030] As an optional implementation, the bottom of the sampling bottle 170 is higher than the water level monitored by the level sensor 120. A first solenoid valve 190 is connected to the bottom of the sampling bottle 170, and the first solenoid valve 190 is connected to a return pipe 210 that extends into the temporary storage tank 110. The first solenoid valve 190 is electrically connected to the PLC controller 130. After the concentration of the DMF solution in the sampling bottle 170 is detected, the first solenoid valve 190 is opened, allowing the DMF solution to automatically flow back into the temporary storage tank 110 through the return pipe 210, thereby reducing waste.

[0031] As an optional implementation, a second solenoid valve 220 and a third solenoid valve 230 are respectively connected to the bottom of the temporary storage tank 110. The second solenoid valve 220 is connected to the recovery pipe 240, and the third solenoid valve 230 is connected to the discharge pipe 250. Both the second solenoid valve 220 and the third solenoid valve 230 are electrically connected to the PLC controller 130.

[0032] In this embodiment, based on the concentration detection result of the DMF solution, if the concentration is qualified, the third solenoid valve 230 is opened to discharge the DMF solution through the discharge pipe 250 for use or storage in the finished product tank (not shown in the figure). If the concentration is too low and unqualified, the second solenoid valve 220 is opened to return the DMF solution to the corresponding device of the recycling process system through the recovery pipe 240 for recycling. The opening and closing of the second solenoid valve 220 and the third solenoid valve 230 are automatically operated based on the PLC controller 130 and do not require human management.

[0033] As an optional implementation, the sampling tube assembly 150 includes a first sampling tube 151 connected to the water pump 140. A multi-way solenoid valve 152 is connected to the bottom of the first sampling tube 151. A plurality of second sampling tubes 153 are connected to the bottom of the multi-way solenoid valve 152. The bottom height of each second sampling tube 153 is different. The multi-way solenoid valve 152 is electrically connected to the PLC controller 130.

[0034] In this embodiment, by setting a second sampling tube 153 with different sampling heights, DMF solutions at different depths can be sampled separately, and the concentration of DMF solutions at different depths can be detected separately. After each test, the DMF solution needs to be returned to the temporary storage tank 110 through the return pipe 210. Only when the concentration of DMF solutions at different depths meets the qualified standard can the DMF solution in the temporary storage tank 110 meet the finished product standard, thus improving the detection accuracy and reducing data errors.

[0035] As an optional implementation, the concentration analysis unit 180 includes a DMF solution concentration meter 181 that extends into the sampling bottle 170. The DMF solution concentration meter 181 is connected to a concentration analyzer 182 via wires. The DMF solution concentration meter 181 can detect the concentration of the DMF solution online and send the detection data to the concentration analyzer 182 for storage and analysis. The concentration analyzer 182 can also generate analysis curves or graphs based on multiple sets of detection data, facilitating the review of historical records by staff. It should be noted that the DMF solution concentration meter 181 can be an existing online concentration meter of model CM-800a (general type), which meets the usage requirements.

[0036] As an optional implementation, a fourth solenoid valve 260 is connected to one side wall of the sampling bottle 170 near the top of the sampling bottle 170. The fourth solenoid valve 260 is connected to a water inlet pipe 270. A fifth solenoid valve 280 is connected to the bottom of the sampling bottle 170. The fifth solenoid valve 280 is connected to a drain pipe 290. Both the fourth solenoid valve 260 and the fifth solenoid valve 280 are electrically connected to the PLC controller 130.

[0037] In this embodiment, after the concentration detection of the DMF solution in the sampling bottle 170 is completed and the solution is returned to the temporary storage tank 110, the fourth solenoid valve 260 can be opened to add cleaning agent or purified water through the water inlet pipe 270 to clean the residual solution inside the sampling bottle 170. Then, the fifth solenoid valve 280 is opened to discharge the cleaned water through the fifth solenoid valve 280, so as to avoid the residual solution in the sampling bottle 170 from mixing with the solution of the next test sample, which would lead to inaccurate test data, thereby improving the test accuracy.

[0038] As an optional implementation, a telescopic cylinder 310 is provided on the top of the sampling bottle 170. The telescopic end of the telescopic cylinder 310 extends into the sampling bottle 170 and is connected to a cleaning mechanism 320, which is used to clean the inner wall of the sampling bottle 170. The telescopic cylinder 310 can drive the cleaning mechanism 320 to move up and down along the inner wall of the sampling bottle 170, thereby improving the cleaning effect.

[0039] As an optional implementation, the cleaning mechanism 320 includes a connector 321 connected to the telescopic end of the telescopic cylinder 310. At least two connecting rods 322 are connected to the side wall of the connector 321. The other end of the connecting rods 322 is connected to an annular member 323. The outer wall of the annular member 323 is provided with a plurality of bristles 324 that contact the inner wall of the sampling bottle 170.

[0040] In this embodiment, when the telescopic cylinder 310 moves the connector 321 and the annular component 323 up and down, it drives the brush bristles 324 to wipe the inner wall of the sampling bottle 170 up and down. Simultaneously, the up-and-down movement of the annular component 323 promotes the flow of cleaning agent, resulting in more thorough and effective cleaning. It should be noted that the DMF solution concentration meter 181 can pass through the gap between the connecting rod 322 and the annular component 323; therefore, the up-and-down movement of the annular component 323 will not interfere with the DMF solution concentration meter 181.

[0041] As an optional implementation, the outer wall of the temporary storage tank 110 is provided with a support plate 330, and the sampling bottle 170 is placed on the support plate 330, which is an integrated design with a compact structure.

[0042] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. An automatic sampling device for DMF distillation, characterized in that, The device includes a temporary storage tank, a liquid level sensor installed inside the storage tank, a PLC controller electrically connected to the outer wall of the storage tank, a water pump installed on the outer wall of the storage tank, a sampling tube assembly extending into the bottom of the storage tank connected to the water pump, a drain pipe connected to the drain pipe connected to a sampling bottle connected to the sampling bottle, and a concentration analysis mechanism connected to the sampling bottle.

2. The DMF distillation automatic sampling device as described in claim 1, characterized in that, The bottom of the sampling bottle is higher than the water level monitored by the liquid level sensor. A first solenoid valve is connected to the bottom of the sampling bottle. The first solenoid valve is connected to a return pipe that extends into the temporary storage tank. The first solenoid valve is electrically connected to the PLC controller.

3. The DMF distillation automatic sampling device as described in claim 2, characterized in that, The bottom of the temporary storage tank is connected to a second solenoid valve and a third solenoid valve, respectively. The second solenoid valve is connected to a recovery pipe, and the third solenoid valve is connected to a discharge pipe. Both the second solenoid valve and the third solenoid valve are electrically connected to the PLC controller.

4. The DMF distillation automatic sampling device as described in claim 1, characterized in that, The sampling tube assembly includes a first sampling tube connected to the water pump, a multi-way solenoid valve connected to the bottom of the first sampling tube, and multiple second sampling tubes connected to the bottom of the multi-way solenoid valve. The bottom height of each second sampling tube is different, and the multi-way solenoid valve is electrically connected to the PLC controller.

5. The DMF distillation automatic sampling device as described in claim 1, characterized in that, The concentration analysis mechanism includes a DMF solution concentration meter that extends into the sampling bottle, and the DMF solution concentration meter is connected to a concentration analyzer via wires.

6. The DMF distillation automatic sampling device as described in claim 1, characterized in that, A fourth solenoid valve is connected to one side wall of the sampling bottle near the top of the sampling bottle. The fourth solenoid valve is connected to a water inlet pipe. A fifth solenoid valve is connected to the bottom of the sampling bottle. The fifth solenoid valve is connected to a drain pipe. Both the fourth and fifth solenoid valves are electrically connected to the PLC controller.

7. The DMF distillation automatic sampling device as described in claim 6, characterized in that, The sampling bottle is equipped with a telescopic cylinder at the top. The telescopic end of the telescopic cylinder extends into the sampling bottle and is connected to a cleaning mechanism, which is used to clean the inner wall of the sampling bottle.

8. The DMF distillation automatic sampling device as described in claim 7, characterized in that, The cleaning mechanism includes a connector that is connected to the telescopic end of the telescopic cylinder. At least two connecting rods are connected to the side wall of the connector. The other end of the connecting rod is connected to an annular component. The outer side wall of the annular component is provided with multiple bristles that contact the inner wall of the sampling bottle.

9. The DMF distillation automatic sampling device as described in claim 1, characterized in that, The outer wall of the temporary storage tank is provided with a support plate, and the sampling bottle is placed on the support plate.

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