Online flaw detection device for loose nanofiltration membrane

Abstract

The utility model discloses an online flaw detection device for loose nanofiltration membranes, which comprises a dyeing water tank, a cleaning water tank and a detection component which are positioned at an outlet of a production line for preparing loose nanofiltration membrane flowing water, and the prepared loose nanofiltration membranes sequentially pass through the dyeing water tank, the cleaning water tank and the detection component under the conveying of a conveying device; dye is contained in the dyeing water tank, and the loose nanofiltration membrane is conveyed by the conveying device to pass through the dyeing water tank, so that one side containing a desalting layer is in full contact with the dye; a cleaning device for cleaning the loose nanofiltration membrane passing through the cleaning water tank is arranged in the cleaning water tank and is used for removing dye on the surface of the loose nanofiltration membrane; the detection assembly detects the residual dye on one side of the loose nanofiltration membrane containing the desalination layer, and the position of the residual dye is marked as a defect position. According to the utility model, the loose nanofiltration membrane is conveyed by the conveying device to be dyed, cleaned and detected, so that online and batch detection in industrial production is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to a detection device, specifically relates to a kind of loose nanofiltration membrane diaphragm online flaw detection device. BACKGROUND

[0002] Membrane technology is a new material separation technology, because it has the advantages of not changing the original material type, not introducing new impurity components, low energy consumption, small occupation, safety and stability, gradually replaces traditional process such as thermal distillation, extraction, and is widely used in seawater desalination, reclaimed water reuse, salt lake lithium extraction, industrial wastewater zero discharge and salt separation fields.

[0003] Composite nanofiltration membrane generally includes non-woven fabric, polysulfone support layer and characteristic separation layer in structure, and is divided into tight nanofiltration membrane and loose nanofiltration membrane according to the size of separation aperture, the former is mainly used for the separation of different valence inorganic salts, and the latter is often used for the separation between organic matter and inorganic matter, such as the separation of wastewater in printing and dyeing industry.For the integrity evaluation of tight nanofiltration membrane diaphragm, salt solution permeability test is generally used, that is, magnesium sulfate solution is used as feed liquid, and the rejection effect of nanofiltration membrane on it is measured under a certain pressure, if the rejection rate is greater than 98%, it can be considered that it has good integrity, however, there is no mature method for the integrity evaluation of loose nanofiltration membrane at present, which is mainly because the aperture is large, there is no corresponding salt as calibration material, and the surface of membrane is immersed and coated with dye to show the integrity of membrane surface in laboratory, then this intermittent operation cannot be applied to industrial production. UTILITY MODEL CONTENT

[0004] The utility model aims at the shortage of prior art, and provides a kind of loose nanofiltration membrane diaphragm online flaw detection device.The technical solution is as follows:

[0005] The utility model discloses a kind of loose nanofiltration membrane diaphragm online flaw detection device, including located in the dyeing water tank of preparation loose nanofiltration membrane diaphragm water production line export, cleaning water tank and detection component, prepared loose nanofiltration membrane diaphragm is sequentially passed through the dyeing water tank, cleaning water tank and detection component under the conveyance of conveying device;The dyeing water tank contains dye, and loose nanofiltration membrane diaphragm is passed through the dyeing water tank under the conveyance of conveying device, to cause the side containing desalination layer to be in full contact with dye;Cleaning device for removing dye on the surface of loose nanofiltration membrane diaphragm is provided in the cleaning water tank, for cleaning the loose nanofiltration membrane diaphragm passed through the cleaning water tank;The detection component detects the dye residue of the side containing desalination layer of loose nanofiltration membrane diaphragm, and the position of residual dye is marked as defect position.

[0006] Further, the conveying device runs horizontally inside the dyeing water tank and the cleaning water tank, facilitating dyeing and cleaning of the side containing desalination layer of the loose nanofiltration membrane diaphragm conveyed thereby.

[0007] Further, the upper and lower parts of the inner wall of the dyeing water tank are respectively provided with a liquid injection port and a liquid outlet port for injecting and discharging the dye, so that the dye in the dyeing water tank maintains a certain water level for dyeing the single side of the loose nanofiltration membrane sheet.

[0008] Further, the conveying device is provided with a cylindrical mirror surface compression roller between the dyeing water tank and the cleaning water tank for crushing the bubbles on the surface of the dyed membrane sheet, and the residual dyeing liquid redistributed after the compression is dyed on the membrane sheet again.

[0009] Further, the opposite two inner walls of the cleaning water tank are respectively provided with a water inlet and a water outlet for water inlet and water outlet, so that the cleaning water tank maintains a fixed water level for cleaning the loose nanofiltration membrane sheet.

[0010] Further, the water inlet is a spray head arranged on the upper part of the inner wall of the cleaning water tank, the conveying device is in an inclined state when conveying the loose nanofiltration membrane sheet out of the cleaning water tank, and the spray head sprays water on the loose nanofiltration membrane sheet on the inclined surface to make the cleaning water stay on the membrane surface for a longer time to wash off the dye on the membrane surface as much as possible.

[0011] Further, the inclined surface forms an angle of 60°-75° with the horizontal plane, so that the cleaning water stays on the membrane surface for a longer time to wash off the dye on the membrane surface as much as possible.

[0012] Further, a light source is arranged on the inner wall of the detection assembly, and the conveying device makes the dyed surface of the loose nanofiltration membrane sheet face away from the light source when passing through the detection assembly.

[0013] Further, the detection assembly is further provided with a camera device and a detection analysis device, the camera device is arranged on the side wall opposite to the light source, and the detection analysis device is electrically connected with the camera device for receiving and generating an analysis report.

[0014] The multiple technical solutions provided in the embodiments have at least the following technical effects or advantages:

[0015] (1) The utility model adopts a flow line operation, can directly install the detection device behind the loose nanofiltration membrane sheet on the production line, directly detects the loose nanofiltration membrane sheet on the production line, realizes the online and batch detection of the loose nanofiltration membrane sheet in industrial production.

[0016] (2) In the utility model, the mirror surface compression roller is used to compress the loose nanofiltration membrane sheet dyed through the dyeing water tank, crushes the bubbles on the surface, and the residual dyeing liquid redistributed after the compression is dyed on the membrane surface again.

[0017] (3)The utility model discloses a first cleaning of loose nanofiltration membrane diaphragm after dyeing is carried out to the running water of the stable level in the cleaning water tank, and then the loose nanofiltration membrane diaphragm is cleaned by the spraying above the water tank, and the whole of the loose nanofiltration membrane diaphragm under the spraying cleaning is inclined, so that the cleaning water stays on the membrane surface for a longer time to wash the dye on the membrane surface as much as possible.

[0018] (4)The utility model discloses through monitoring analysis device receives the information of analysis camera device transmission and generates analysis report, realized the automation detection, liberated the manpower. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a kind of loose nanofiltration membrane diaphragm online flaw detection device structure schematic view of the utility model;

[0020] In the drawing: 1-dyeing water tank, 12-dye, 13-liquid injection port, 14-liquid discharge port, (210-220)-compression roller, 3-cleaning water tank, 31-pure water, 32-sprayer, 33 water outlet, 4-detection assembly, 41-daylight, 42-camera, 43-computer. DETAILED DESCRIPTION

[0021] The utility model discloses a kind of loose nanofiltration membrane diaphragm online flaw detection devices, solve the problem that current technology cannot be applied to industrial scale production.

[0022] The technical scheme of the utility model is described in detail below with reference to the drawings, but the protection scope of the utility model is not limited to the described embodiments.

[0023] As Figure 1 Shown, a kind of loose nanofiltration membrane diaphragm online flaw detection device, including dyeing water tank 1, cleaning water tank 3, detection assembly 4 and conveying device.The conveying device is rotating cylindrical mirror surface compression roller 210-220, wherein compression roller 211, 212 are on the same level in dyeing water tank interior, 215, 216 are on the same level in cleaning water tank interior;Wherein dyeing water tank inner wall upper and lower portion are respectively provided with liquid injection port 13 and liquid discharge port 14;The upper portion of the inner wall of cleaning water tank is provided with the sprayer 32 of pure water spraying, the lower portion of the opposite inner wall is provided with the water outlet 33 of drainage, and 60 °-75 ° inclined plane is formed between compression roller 216 and 217;Detection assembly 4 is respectively provided with daylight 41 and camera 42 on the same height of opposite inner wall, and computer 43 arranged in camera 42 and detection assembly is electrically connected, wherein loose nanofiltration membrane diaphragm is turned to conveying when passing through compression roller 220 and is detected in the detection device, and its dyeing surface is opposite to daylight 41.

[0024] When the detection device is in operation, first, dye 12 is injected into the inside of the dyeing water tank 1 through the liquid injection port 13, and the contact between the dye 12 and the bottom line surface of the compression rollers 211 and 212 is adjusted through the liquid injection port 13 and the liquid discharge port 14; then, pure water 31 is injected into the inside of the cleaning water tank 3 through the spray head 32, and the contact between the flowing pure water 31 in the cleaning water tank and the bottom line surface of the compression rollers 215 and 216 in the cleaning water tank 3 is adjusted through the spray head 32 and the water outlet 33; then, the transmission device is started to convey the loose nanofiltration membrane sheet to pass through the dyeing water tank 1, the cleaning water tank 3 and the detection assembly 4 in sequence, wherein the loose nanofiltration membrane sheet only contacts the dye solution 12 and the pure water 31 on the side containing the functional separation layer when passing through the dyeing water tank 1 and the cleaning water tank 3, the loose nanofiltration membrane sheet is crushed by the mirror surface compression rollers 213 and 214 after being conveyed out of the dyeing water tank 1, the bubbles on the surface of the loose nanofiltration membrane sheet are crushed, and the residual dyeing liquid on the surface of the loose nanofiltration membrane sheet is dyed again after being redistributed; then, the loose nanofiltration membrane sheet enters the cleaning water tank 3, is cleaned twice by the flowing pure water 31 and the pure water sprayed by the spray head 32, the dye on the dyeing surface of the loose nanofiltration membrane sheet is cleaned, and then the loose nanofiltration membrane sheet is conveyed to the inside of the detection assembly 4, is observed and recorded under the backlight condition by the camera 42, and then the information is sent to the computer 43 for analysis.

[0025] As described above, although the present application has been shown and described with respect to certain preferred embodiments, it is to be understood that the present application is not to be limited to the specific embodiments shown and described. Various changes in form and detail can be made without departing from the spirit and scope of the present application as defined by the appended claims.

Claims

1. An online defect detection device for loose nanofiltration membrane sheets, characterized in that: It includes a dyeing water tank, a cleaning water tank and a detection component located at the outlet of the water production line for preparing loose nanofiltration membrane sheets. The prepared loose nanofiltration membrane sheets pass through the dyeing water tank, the cleaning water tank and the detection component in sequence under the conveyance of the conveying device; The dyeing water tank contains dye, and the loose nanofiltration membrane sheet is conveyed by the conveying device through the dyeing water tank, so that the side containing the desalination layer is fully in contact with the dye; The cleaning water tank is provided with a cleaning device for cleaning the loose nanofiltration membrane pieces passing through the cleaning water tank, and is used to remove dyes on the surface of the loose nanofiltration membrane pieces; The detection component detects the residual dye on one side of the loose nanofiltration membrane sheet containing the desalting layer, and the position of the residual dye is marked as the defect position.

2. The online defect detection device for loose nanofiltration membrane sheets according to claim 1, characterized in that: The conveying device runs horizontally inside the dyeing water tank and the cleaning water tank, so as to facilitate dyeing and cleaning of the side of the loose nanofiltration membrane sheet containing the desalination layer that is conveyed by the conveying device.

3. The online defect detection device for loose nanofiltration membrane sheets according to claim 2, characterized in that: The upper and lower parts of the inner wall of the dyeing water tank are respectively provided with a liquid injection port and a liquid outlet, which are used for injecting and discharging dye respectively, so that the dye inside the dyeing water tank maintains a certain water level, which is used to dye a single side of the loose nanofiltration membrane sheet passing through.

4. The online defect detection device for loose nanofiltration membrane sheets according to claim 3, characterized in that: The conveying device is provided with a cylindrical mirror-surface pressing roller between the dyeing water tank and the cleaning water tank, which is used to crush the bubbles on the surface of the dyed membrane and then dye the membrane surface again with the dye residue redistributed behind the pressing roller.

5. The online defect detection device for loose nanofiltration membrane sheets according to claim 4, characterized in that: The cleaning water tank is provided with a water inlet and a water outlet on the two inner walls thereof, which are used for water intake and water discharge respectively, so as to maintain a fixed water level of living water inside the cleaning water tank for cleaning the loose nanofiltration membrane sheets passing through.

6. The online defect detection device for loose nanofiltration membrane sheets according to claim 5, characterized in that: The water inlet is a nozzle arranged on the upper part of the inner wall of the cleaning water tank. The conveying device is in an inclined state when transporting the loose nanofiltration membrane pieces out of the cleaning water tank. The nozzle sprays water to clean the loose nanofiltration membrane pieces on the inclined surface, so that the cleaning water stays on the membrane surface for a longer time to wash away the dye on the membrane surface as much as possible.

7. The online defect detection device for loose nanofiltration membrane sheets according to claim 6, characterized in that: The inclined surface forms an angle of 60°-75° with the horizontal surface, so that the cleaning water stays on the membrane surface for a longer time to wash away the dye on the membrane surface as much as possible.

8. The online defect detection device for loose nanofiltration membrane sheets according to any one of claims 1 to 7, characterized in that: A light source is provided on the inner wall of the detection component, and when the conveying device passes through the detection component, the dyed surface of the loose nanofiltration membrane piece faces away from the light source.

9. The online defect detection device for loose nanofiltration membrane sheets according to claim 8, characterized in that: The detection component is further provided with a camera device and a detection and analysis device. The camera device is provided on the side wall opposite to the light source. The detection and analysis device is electrically connected to the camera device for receiving and analyzing information sent by the camera device and generating an analysis report.

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