CN111233100A - Device for treating radioactive waste water capable of automatically installing and replacing membrane in membrane stack - Google Patents

Abstract

The invention relates to equipment which is used for treating radioactive wastewater and can automatically install and replace membranes in a membrane stack, wherein the membrane stack comprises a plurality of membrane partition plates (1) and membranes (2), the equipment comprises a rack assembly (3), and an automatic pulling plate mechanism (4), an automatic membrane scraping mechanism (5) and an automatic membrane loading mechanism (6) which are arranged on the rack assembly (3); the frame assembly (3) can reciprocate along the Y-axis direction, and the automatic plate pulling mechanism (4) can pull apart the adjacent membrane partition plates (1); the automatic film scraping mechanism (5) can remove the old film (2); the automatic membrane installing mechanism (6) can install a new membrane (2) between the adjacent membrane partition plates (1) so as to finish automatic installation and membrane replacement, thereby avoiding direct contact between an operator and radioactive wastewater and avoiding radioactive hazards.

Description

Device for treating radioactive waste water capable of automatically installing and replacing membrane in membrane stack

Technical Field

The invention relates to the field of radioactive wastewater treatment, in particular to equipment which is used for treating radioactive wastewater and can automatically install and replace membranes in a membrane stack.

Background

The membrane separation technology is a new separation technology and has the characteristics of no physical phase change, low energy consumption, simple equipment, convenient operation, strong adaptability and the like. Since the beginning of the 60's of the 20 th century, large-scale industrial applications have developed very rapidly.

The rising of the membrane technology provides a new choice for radioactive wastewater treatment. Ultrafiltration, microfiltration, reverse osmosis membrane treatment, electrodialysis, etc. are all common methods for radioactive wastewater treatment.

The flat membrane stack is an effective unit for water treatment, and is a main component of electrically driven membrane application and pressure membrane application because of the advantages of easy processing, pollution resistance, good cleaning, long service life and the like. Electrically driven membrane applications include electrolysis, electrodialysis, diffusion dialysis, displacement electrodialysis, bipolar membrane electrodialysis, electrodeionization, fluid cells, etc.), pressure membrane applications include microfiltration, ultrafiltration, nanofiltration, reverse osmosis, forward osmosis, etc. Flat sheet membrane stacks are typically membrane elements consisting of membranes, membrane separators, pole plates, clamping plates, etc. However, the installation and replacement of the membranes and membrane separators in the membrane stack generally requires manual operations, and the replacement of the membranes is cumbersome and difficult.

However, in the treatment of radioactive wastewater, especially in the treatment of highly radioactive wastewater in nuclear wastewater, how to automatically mount, dismount and replace the membrane (or called membrane) is a problem that researchers pay attention to so that operators are far away from the harm of radioactive wastewater;

in addition, the traditional membrane baffle is the film product who takes injection molding or extrusion molding as the frame, like patent number CN204841425U, in the name "a baffle for electrodialysis device" utility model patent, insert the clamp net through the water distribution runner that adopts and lead in the middle of the liquid hole, there is the delivery port on the outer frame, baffle thickness is 0.5 ~ 1.5mm, take PP, PE, silicon rubber etc. usually, this kind of baffle is in the application, lean on membrane and clamp plate extrusion seal to guarantee that the water in the baffle is not to outside seepage (exosmosis), still need to guarantee that the water between different cells is not mutual seepage (endosmosis). However, the separator is limited by the processing precision, material performance, operation level and other reasons, and is difficult to ensure that no internal seepage and external seepage are generated, which causes the performance reduction of the membrane stack, and the application of the separator in special fields such as radioactive wastewater treatment is limited. At present, the sealing performance of the membrane stack is improved only by changing the material performance, increasing the sealing edge width, improving the extrusion condition and the like, but the problems of water leakage and electric leakage are not solved fundamentally.

Accordingly, there is a need to develop an apparatus that can automatically install and replace membrane sheets in a non-endo-and exo-osmotic membrane stack for treating radioactive wastewater.

Disclosure of Invention

In order to overcome the problems, the inventor of the present invention has made intensive studies to design an apparatus for automatically installing and replacing membranes in a membrane stack for treating radioactive wastewater, wherein the membrane stack comprises a plurality of membrane partition plates 1 and membranes 2, the apparatus comprises a frame assembly 3, and an automatic plate pulling mechanism 4, an automatic membrane scraping mechanism and an automatic membrane loading mechanism which are arranged on the frame assembly 3; the frame assembly 3 can reciprocate along the Y-axis direction, and the automatic plate pulling mechanism 4 can pull apart the adjacent membrane partition plates 1; the automatic film scraping mechanism 5 can remove old film pieces; the automatic membrane installing mechanism 6 can install a new membrane between the adjacent membrane partition plates 1, and further automatically install and replace the membrane, so that direct contact between an operator and radioactive wastewater is avoided, particularly direct contact between high-level wastewater in nuclear wastewater is avoided, and radioactive hazards are avoided.

Specifically, the present invention aims to provide the following:

in a first aspect, the invention provides an apparatus for automatically installing and replacing membranes in a membrane stack for treating radioactive wastewater, wherein the membrane stack comprises a plurality of membrane partition boards 1 and membranes 2, the apparatus comprises a rack assembly 3, and an automatic plate pulling mechanism 4, an automatic membrane scraping mechanism 5 and an automatic membrane installing mechanism 6 which are arranged on the rack assembly 3; the frame assembly 3 can reciprocate along the Y-axis direction, and the automatic plate pulling mechanism 4 can pull apart the adjacent membrane partition plates 1; the automatic film scraping mechanism 5 can remove old film pieces; the automatic film loading mechanism 6 can install a new film between the adjacent film partition boards 1.

In a second aspect, the present invention also provides a method for automatically installing and replacing a diaphragm, preferably with the apparatus of the first aspect, the method comprising the steps of:

first, the second pressing plate 72 in the automatic pressing mechanism is opened; then, an automatic plate pulling mechanism 4 is utilized to pull apart a membrane partition plate 1; then, removing the old membrane adhered to the membrane partition plate 1 by using an automatic membrane scraping mechanism 5; and then a new membrane is installed by using the automatic membrane installing mechanism 6.

The equipment which is used for treating radioactive wastewater and can automatically install and replace the membrane has the advantages that:

(1) the equipment provided by the invention realizes an integrated structure design, occupies less space and is simple to operate;

(2) the equipment provided by the invention can realize automatic and continuous installation and replacement of the diaphragm;

(3) the equipment provided by the invention can avoid direct contact between operators and radioactive wastewater, particularly direct contact between high-level radioactive wastewater in nuclear wastewater, and avoids radioactive hazard;

(4) the equipment provided by the invention has the advantages of simple operation method, high membrane replacement efficiency and low cost.

Drawings

FIG. 1(1) shows a schematic top view of a film stack and automatic plate pulling mechanism;

figure 1(2) shows a schematic top view of a U-robot according to one embodiment of figure 1 (1);

FIG. 2 shows a schematic top view of a blocker robot in another embodiment;

FIG. 3 is a schematic top view of another embodiment of a blocker robot after rotation through an angle;

FIG. 4 shows a schematic cross-sectional view of the frame assembly and membrane spacer in the direction of the X-axis;

FIG. 5 shows a schematic view of the automatic film cutting mechanism and film stack along the Y-axis direction;

FIG. 6 is a schematic sectional top view of the frame assembly and the automatic film scraping and placing mechanisms;

fig. 7 shows a partially enlarged view of the automatic film scraping mechanism in fig. 5;

fig. 8 shows a partially enlarged view of the wiper blade in fig. 7;

FIG. 9 is a schematic cross-sectional view along the X-axis of the automatic film feeding mechanism pulling the film sheet to the bottom end of the film separator;

FIG. 10 is a top view of a gripper of the automatic film laying mechanism in the preferred embodiment of the present invention;

FIG. 11 is a schematic cross-sectional view of a slit film knife in a preferred embodiment of the present invention along the X-axis;

FIG. 12 shows a schematic view of the beginning of the slitting of the film in FIG. 11;

FIG. 13 is a schematic view of a snap on membrane spacer in accordance with a preferred embodiment of the present invention;

FIG. 14 is a schematic view showing the structure of a membrane separator according to a preferred embodiment of the present invention;

FIG. 15(1) shows a schematic view of a membrane spacer provided with large sealing grooves on one side;

fig. 15(2) shows a schematic view of a membrane separator provided with small sealing grooves on the other side.

The reference numbers illustrate:

1-Membrane separator

11-baffle plate

12-fastener

13-inner net

14-inlet hole

141-water inlet pipe

15-water outlet

151-outlet pipe

16-outer frame

161-Large seal groove

162-Small seal groove

121-bump

122-vertical rod

1221-pusher head

123-oscillating lever

1231-locking head

124-limiting block

125-accommodating tank

2-diaphragm

3-frame assembly

31-column

32-beam

33-top beam

34-guide rail

4-automatic plate pulling mechanism

411-U type manipulator

412-dog manipulator

5-automatic film scraping mechanism

51-moving rod I

52-fixing rod

53-doctor blade

531-Soft doctor blade

532-hard doctor blade

6-automatic film loading mechanism

61-automatic film releasing mechanism

611-roller

612-hand grip

6121-splint

6122-bolt

6123-rotating part

613-travel rod II

62-automatic film cutting mechanism

621-moving rod III

622-film cutting knife

6221 scissor head

6222-inductor

6223 Scissors tail

6224 electromagnet

6225 baffle plate

6226 spring

7-automatic pressing mechanism

71-first platen

72-second platen

73-drive rod

20-guide plate

Detailed Description

The invention is explained in more detail below with reference to the figures and examples. The features and advantages of the present invention will become more apparent from the description.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

The equipment which is used for treating radioactive wastewater and can automatically install and replace the membranes in the membrane stack comprises a plurality of membrane partition plates 1 and a plurality of membranes 2, a rack assembly 3, and an automatic plate pulling mechanism 4, an automatic membrane scraping mechanism 5 and an automatic membrane installing mechanism 6 which are arranged on the rack assembly 3; the frame assembly can reciprocate along the Y-axis direction, and the automatic plate pulling mechanism 4 can pull apart the adjacent membrane partition plates 1; the automatic film scraping mechanism 5 can remove old film pieces; the automatic film loading mechanism 6 is capable of loading a new film sheet between adjacent film partitions, as shown in fig. 1(1), 4, 5, 6, 9, 11, and 12.

After a lot of research and experiments, the inventor finally designs the device capable of automatically replacing the diaphragm. Compared with the traditional method of manually replacing the membrane and the membrane partition plate in the membrane stack, the equipment provided by the invention can save manpower and material resources and improve the efficiency on one hand; on the other hand, it is also very important on the one hand, it can be used for handling the membrane stack of radioactive waste water, avoids operating personnel and radioactive waste water's direct contact, has avoided radioactive hazard, has guaranteed safety.

In a preferred embodiment, the front end and the rear end of the membrane separator 1 are provided with baffles 11; referring to fig. 1(1), 4 and 14, the design of the baffle 11 facilitates the automatic plate pulling mechanism 4 to pull apart adjacent membrane partitions;

preferably, the baffle 11 is provided with a buckle 12, and the adjacent membrane partition boards 1 can be pressed by the buckle 12 to lock the adjacent membrane partition boards 1; the membrane partitions are pulled apart by opening the clasps, while the clasps 12 can be opened while the adjacent membrane partitions remain stationary when the membrane partition 1 is pulled, as shown with reference to fig. 1(1) and 13.

The inventor has found that the design of the clips 12 ensures that when one membrane partition is pulled open, the old membrane is removed or scraped away and a new membrane is installed, if the adjacent membrane partition is not fixed, the installation and replacement of the membrane is hindered.

Further preferably, as shown in fig. 13, the buckle includes a protrusion 121 and a vertical rod 122, the protrusion 121 and the vertical rod 122 are connected by an oblique block, the other end of the vertical rod 122 is a pushing head 1221, the vertical rod 122 is disposed inside the baffle 11, the buckle further includes a swing rod 123, one end of the swing rod 123 is fixed on the adjacent baffle 11 and is fixed by a limiting block 124, and the other end of the swing rod 123 is a locking head 1231; the baffle 11 is further provided with an accommodating groove 125 which is arranged above the pushing head 1221 and can accommodate the locking head 1231;

when the adjacent membrane spacers are pressed, the locking head 1231 of the swing rod 123 is inserted into the accommodating groove 125 and is clamped, so that the adjacent membrane spacers are locked; when the baffle 11 is pulled by the pulling plate manipulator, a force is applied to the protrusion 121, the protrusion 121 pushes the vertical rod 122 to move upwards, and the locking head 1231 is pushed upwards by the pushing head 1221, so that the locking head 1231 leaves the accommodating groove 125, and the adjacent membrane partition plates are pulled apart.

It should be noted that any two adjacent membrane separators can be locked by the buckle 12 when being pressed.

In one embodiment, the frame assembly 3 includes a column 31, a cross beam 32, a top beam 33, and a guide rail 34, wherein the cross beam 32 is located between the column 31 and the top beam 33; at least two upright posts are arranged; the membrane stack is located between two uprights 31, above which the cross beams 32 and the top beams 33 are located.

In the invention, the upright columns 31 are cubic columns, and the two upright columns are symmetrically distributed on the front side and the rear side of the film stack along the X-axis direction. The column 31 is movable on a guide rail 34 in the Y-axis direction; the lower extreme of membrane heap also is provided with guide rail II, and arbitrary membrane baffle all can move at guide rail II along Y axle direction. The guide rail 34 and the guide rail II are two parallel rails, and preferably, the two rails are connected and integrated through a base.

In the present invention, the cross beam 32 is disposed below the top ends of the columns 31 and the top beam 33, the cross beam 32 is disposed at the top end of each column, the cross beam 32 can be used for arranging an operation control system of a corresponding mechanism, and an automatic film scraping mechanism 5 as described below can be disposed on the cross beam 32.

In the present invention, the top beam 33 can connect two columns symmetrically arranged, so that the rack assembly 3 is integrated by the arrangement of the top beam 33.

The frame assembly 3 is capable of reciprocating on the guide rails 34 in the Y-axis direction under the control of the control system.

In one embodiment, the automatic plate pulling mechanism 4 is disposed on the column 31 and can reciprocate along the X-axis direction, the Y-axis direction, or the Z-axis direction; the automatic plate pulling mechanism 4 includes a plate pulling robot capable of pulling the membrane partition 1 by pulling the baffle plate 11 of the membrane partition 1, as shown in fig. 1(1), 1(2), 2, and 3.

In the invention, the automatic plate pulling mechanism 4 can find the baffle plate 11 of the membrane partition plate needing to be pulled open through a specified stroke setting or positioning or sensing system, and then the baffle plate 11 is pulled through the plate pulling mechanical arm and the membrane partition plate is pulled open through the movement of the automatic plate pulling mechanism 4 along the Y-axis direction.

In a preferred embodiment, the plate pulling mechanical arm can also move back and forth along the X-axis direction under the control of the control system, so that the distance between the plate pulling mechanical arm and the baffle 11 of the membrane partition plate can be adjusted, and the alignment and the finding of the baffle 11 of the membrane partition plate by the plate pulling mechanical arm are facilitated.

In the present invention, the structure of the pulling robot is not particularly limited as long as the pulling robot can contact the surface of the barrier 11 of the film separator, pull the film separator in the Y-axis direction, and pull only one film separator at a time.

In one embodiment of the present invention, referring to fig. 1(1) and 1(2), the plate pulling robot is an open U-shaped, i.e., U-shaped robot 411, which can hold the baffle plate 11 on the film separator and slide the film separator by moving in the Y-axis direction.

In another embodiment of the present invention, referring to fig. 2 and 3, the plate pulling robot is a stopper robot 412, which can rotate in the Y-axis direction and cannot rotate in the reverse direction. When the rack assembly 3 or the automatic plate pulling mechanism 4 moves along the Y-axis direction, the plate pulling mechanical arm can drive the membrane partition plate to slide towards the Y-axis direction by pulling the baffle plate 11 on the membrane partition plate; when the rack assembly or the automatic plate pulling mechanism moves towards the negative Y-axis direction, the stop block manipulator 412 can rotate towards the Y-axis direction, and the stop block 412 can rotate to be parallel to the Y-axis direction, so that the distance between the plate pulling manipulator and the membrane partition plate 11 is not required to be adjusted by moving the automatic plate pulling mechanism 4 along the X-axis direction, and the operation steps are reduced.

In the invention, the film partition plates are driven to slide by the movement of the arranged automatic plate pulling mechanism along the Y-axis direction, so that the adjacent film partition plates are pulled apart by a required distance. Thereby enabling the removal of the old film in the next step.

In a preferred embodiment of the present invention, referring to fig. 5, 6, 7 and 8, the apparatus further includes an automatic film scraping mechanism 5, disposed on the cross beam 32 of the rack assembly 3, and including a moving rod I51, a fixing rod 52 and a scraping blade 53, wherein the scraping blade 53 is fixed on the fixing rod 52 in parallel, the fixing rod 52 is fixedly connected with the moving rod I51, the moving rod I51 is disposed on the cross beam 32 along the Z-axis direction, and the moving rod I51 can move up and down along the Z-axis direction and simultaneously drive the fixing rod 52 and the scraping blade 53 to move up and down; preferably, the number of the automatic film scraping mechanisms 5 is two; the length of the scraping blade is not less than the width of the membrane.

In the present invention, the material of the wiper blade is not particularly limited, and is preferably a plastic material. The length of the wiper blade is preferably not less than the width of the membrane.

In a preferred embodiment, referring to fig. 7 and 8, the wiper 53 can be angularly adjusted, the wiper 53 includes a soft wiper 531 and a hard wiper 532, the soft wiper 531 is located at the lower end, the hard wiper is located at the upper end, the soft wiper 531 contacts the membrane first during the film wiping, the soft wiper 531 has a certain elasticity, and when the soft wiper 531 removes the membrane incompletely, the soft wiper can be completely removed or wiped clean by the hard wiper 532.

In the present invention, the automatic film scraping mechanism 5 can scrape off or remove an old film adsorbed or adhered to the film separator. The purpose is to install a new membrane afterwards.

In a preferred embodiment of the present invention, referring to fig. 4, 6, 9 and 10, the automatic film loading mechanism 6 includes an automatic film releasing mechanism 61, which includes a roller 611 on which a film is wound, a hand grip 612 and a moving rod II 613, the roller 611 is disposed on the top beam 33 in parallel, the hand grip 612 is disposed on the cross beam 32 and disposed below the roller 611 in parallel, the hand grip 612 can grip the film, the hand grip 612 is further fixedly connected to the moving rod II 613, the moving rod II 613 is disposed on the cross beam 32 in the Z-axis direction, and the moving rod I51 can move up and down in the Z-axis direction and simultaneously drives the hand grip 612 to move up and down; grab the diaphragm simultaneously and reciprocate, and then can install new diaphragm between the adjacent membrane baffle.

In the invention, the rolling of the rolling shaft 611 drives the film to be folded or released; the hand grip 612 can grip both sides of the lower end of the membrane sheet and put the lower end of the membrane to be flush with or beyond the lower end of the membrane partition by the downward movement of the moving rod II 613 and put the membrane between two adjacent membrane partitions. The membrane is fixedly installed by fixedly pressing two adjacent membrane clapboards;

after the film is secured by the film spacers, the fingers 612 can be withdrawn (or returned) under the rollers 611 and again grip both sides of the film for use, preventing the film from being completely received onto the rollers 611 and failing to grip the film.

In a preferred embodiment, referring to fig. 4, 9 and 10, the hand grip 612 includes two clamping plates 6121 and a rotating part 6123, the clamping plates 6121 and the rotating part 6123 are connected by two bolts 6122, the thread direction of the bolt 6122 between the two clamping plates is different, and the two clamping plates 6121 can be moved in opposite directions by the rotation of the rotating part 6123, so that the hand grip 612 can grasp (or clamp) the diaphragm 2 or loosen the diaphragm 2; more preferably, the inner side of the clamping plate 6121 is provided with a frosted surface to increase the friction force.

In a preferred embodiment, as shown in fig. 4, 11 and 12, the automatic film loading mechanism 6 further includes an automatic film cutting mechanism 62 which is disposed in parallel below the hand grip 612 and above the film separating plate 1, can move back and forth in the X-axis direction, and can cut the film sheet in the X-axis direction; preferably, one end of the automatic film cutting mechanism 62 is a moving rod III621, and the other end is a film cutting knife 622, the moving rod III621 is arranged on the cross beam 32 along the X-axis direction, and can move back and forth along the X-axis direction while driving the film cutting knife 622 to move back and forth; more preferably, the film cutting knife 622 is provided with an inductor.

Further preferably, as shown in fig. 11 and 12, the film cutting knife 622 is similar to a scissors structure, the front end of the knife is a scissor head 6221, two sensors 6222 are arranged on the scissor head, the rear end 6223 is connected by a spring 6226, the spring is arranged in two sections, a blocking piece 6225 is arranged between the two sections, and the rear end is further provided with an electromagnet 6224; when the sensor 6222 senses the diaphragm 2, the electromagnet 6224 is energized, the spring 6226 of the rear end is compressed, and the scissor head 6221 starts to shear the diaphragm 2 and moves in the X-axis direction, thereby gradually shearing the diaphragm 2. To this end, the mounting of one membrane 2 is completed. After the membrane 2 is completely cut off, the automatic membrane cutting mechanism 62 moves along the negative X-axis direction and withdraws to the initial position for standby.

The operation is repeated, namely the automatic plate pulling mechanism 4 pulls one membrane partition plate 1, the automatic membrane scraping mechanism 5 removes or shovels the old membrane, and the automatic membrane installing mechanism 6 is started to install the new membrane (or membrane). And repeating the steps in sequence to finish the replacement and installation of all the membranes.

In a preferred embodiment, and as shown in fig. 1(1) and 9, the apparatus comprises an automatic hold-down mechanism 7 located inside the frame assembly 3; the automatic pressing mechanism comprises a first pressing plate 71, a second pressing plate 72 and a transmission rod 73, wherein the first pressing plate 71 and the second pressing plate 72 are respectively arranged at two ends of the film stack along the Y-axis direction; the transmission rod 73 is connected with the first pressing plate 71 and the second pressing plate 72, and the second pressing plate 72 can move towards the first pressing plate 71 or move reversely through the rotation of the transmission rod 73; preferably, the transmission rod 73 is a threaded rod. The number of the transmission rods 73 is preferably 4, and the transmission rods are symmetrically distributed at the front end and the rear end of the membrane stack.

Further, the transmission rod 73 is connected with the first pressure plate 71 through a bearing and connected with the second pressure plate 72 through a threaded hole; the motor drives the transmission rod to rotate, and the second pressing plate 72 moves towards the first pressing plate 71 or moves in the reverse direction through the rotation of the transmission rod;

further, the second presser plate 72 is moved in a direction away from the first presser plate 71 (i.e., moved in the Y-axis direction) by the forward rotation of the transmission lever 73; conversely, the second presser plate 7 is moved in the direction of the first presser plate 71 (i.e., in the negative Y-axis direction) by the reverse rotation of the driving lever 73, and the film separators are gradually pressed to form a film stack that can be used.

Further, before the automatic plate pulling mechanism 4 is used to pull apart the adjacent membrane partition plates 1, the automatic pressing mechanism needs to be started to open the second pressing plate 72 away from the first pressing plate 71; otherwise there is no faraday-opened membrane separator 1.

In a preferred embodiment, as shown in fig. 5, the front and rear ends of the film stack are further provided with guide plates 20 parallel to the drive rods 73, enabling the film separator (1) to be fixed in the X-axis direction.

Furthermore, one end of the guide plate 20 is fixedly connected with the first pressing plate 71, and a groove is formed in the guide plate 20 and can be matched with a protrusion arranged on the membrane partition plate 1 for use;

the inventors have found that the guide plates 20 are able to hold the membrane spacers between the two guide plates as they move, avoiding the membrane spacers to deviate from the stack.

In a preferred embodiment, referring to fig. 14, 15(1) and 15(2), the membrane separator 1 comprises an outer frame 16, which is open at the middle and has a groove at the edge of the opening, and an inner mesh 13 can be embedded in the groove;

one surface of the outer frame is called an A surface and is provided with a large sealing groove 161, the other surface of the outer frame is called a B surface and is provided with a small sealing groove 162, the large sealing groove and the small sealing groove are respectively arranged on the periphery of the opening for accommodating the inner net, and the large sealing groove is positioned outside the small sealing groove; sealing rings are respectively arranged in the large sealing groove and the small sealing groove; refer to fig. 15(1) and fig. 15 (2);

the two membranes are respectively contacted with the surface A and the surface B of the membrane separator, the two membranes are respectively sealed to the surface A and the surface B of the membrane separator through the sealing rings in the large sealing groove and the small sealing groove by the other two membrane separators, and a sealing space is formed between the two membranes (or called membranes) and the opening in the middle of the outer frame;

the inventor surprisingly finds that the membrane partition plate can realize the sealing between two membranes and the membrane partition plate, cannot cause the internal seepage and the external seepage, and is suitable for treating radioactive wastewater; more importantly, the membrane separator of the present invention can be adapted to the particular form of installation of the membrane of the present invention.

In a preferred embodiment, referring to fig. 14, 15(1) and 15(2), the front end and/or the rear end of the membrane partition plate 1 is provided with a water inlet hole 14 or a water outlet hole 15 communicated with the middle opening, and is connected with a water inlet pipe 141 or a water outlet pipe 151;

in one embodiment, the respective plurality of water inlet holes 14 may be connected in parallel by a water inlet pipe, and the respective plurality of water outlet holes 15 may be connected in parallel by a water outlet pipe; for example, a plurality of dense water inlet openings can be connected in parallel, a plurality of fresh water inlet openings can be connected in parallel, and likewise, a plurality of dense water outlet openings can be connected in parallel, and a plurality of fresh water outlet openings can be connected in parallel.

In another embodiment, the inlet and outlet openings are connected in series by a water inlet pipe or a water outlet pipe, such as concentrate from one membrane chamber, and then connected to the inlet opening of a third, spaced membrane chamber by a water outlet pipe.

It should be noted that, when the water treatment device is connected in parallel, the water treatment flux is large; and when connected in series, the concentrated water is made more concentrated, but the treatment flux is reduced.

The present inventors found that the arrangement of the water inlet hole 14 and the water outlet hole 15 does not interfere with the arrangement and movement of the membrane, and thus, the water inlet pipe and the water outlet pipe are disposed at the front or rear end of the membrane partition (i.e., both ends of the membrane partition in the X-axis direction).

In one embodiment, the water inlet or outlet is provided at the front end and/or the rear end of the membrane partition, as shown in fig. 15(1), 15(2) and 14, and preferably, the water inlet or outlet is provided at both the front end and the rear end of the membrane partition, as shown in fig. 14.

In one embodiment, the two sides of the lower end of the membrane partition board 1 are provided with sliding blocks, which facilitate the sliding of the membrane partition board on the guide rail II, as shown in fig. 4, 9, 14, 15(1) and 15 (2).

In the invention, the membrane comprises a hydrophobic membrane, such as a membrane used in membrane absorption and membrane distillation, wherein the membrane absorption and the membrane distillation are membrane separation technologies, and the hydrophobic membrane also comprises a pervaporation membrane and an aeration membrane;

the membrane may also be a pressure membrane, such as a microfiltration membrane, ultrafiltration membrane, nanofiltration membrane, reverse osmosis membrane, forward osmosis membrane;

the membrane may also be an ion exchange membrane, including anion exchange membranes, cation exchange membranes, bipolar membranes; the bipolar membrane is also called as bipolar membrane, is a special ion exchange membrane, and is an anion-cation composite membrane prepared by compounding a cation exchange membrane and an anion exchange membrane;

the membrane in the present invention may be one type of membrane; it may be a plurality of types of membranes, such as Cation exchange membranes (abbreviated as C membranes) and anion exchange membranes (abbreviated as a membranes).

In the invention, the electrode plates can also be arranged on the membrane separators at the two ends of the membrane stack along the Y-axis direction, so that the membrane stack can realize the electrodialysis function.

The equipment which is used for treating radioactive wastewater and can automatically install and replace the membrane in the membrane stack is integrally designed and automatically designed, and can automatically remove the old membrane and replace and install a new membrane; the equipment provided by the invention is simple to operate, avoids direct contact between operators and radioactive wastewater, and avoids radioactive hazards, particularly radioactive hazards of high-level radioactive wastewater in nuclear wastewater.

In the present invention, the movement of the travel bars I, II, III is performed by a slide mechanism provided on the cross beam 32.

In a second aspect, the present invention also provides a method for automatically handling a membrane, preferably using the apparatus for treating radioactive wastewater provided in the first aspect, which can automatically install and replace a membrane in a membrane stack, the method comprising the steps of:

first, the second presser plate 73 in the automatic pressing mechanism 7 is opened; then, an automatic plate pulling mechanism 4 is utilized to pull apart a membrane partition plate 1; then, scraping off or removing the old membrane adhered to the membrane partition plate by using an automatic membrane scraping mechanism 5; and then a new membrane is installed by using the automatic membrane installing mechanism 6.

Further, the air conditioner is provided with a fan,

opening the control system, rotating the transmission rod 73, moving the second pressing plate 72 in the direction away from the first pressing plate 71, and pulling the second pressing plate 72 away from the adjacent membrane partition plate 1 by a certain distance;

turning on a power supply, sliding the rack assembly 3 to a first film partition plate 1 closest to the second pressing plate 72 along the negative Y-axis direction, and adjusting the automatic plate pulling mechanism 4 to enable the plate pulling manipulator to be aligned to a baffle plate 11 on the film partition plate 1; the power supply is turned on again, so that the rack assembly 3 slides along the Y-axis direction, and the film partition plate 1 is pulled by the plate pulling mechanical arm and is pulled to a set position;

adjusting the position of the movable frame assembly 3 to make the automatic film scraping mechanism 5 align with the film side of the stretched film partition board 1, gradually moving the scraping blade 53 in the automatic film scraping mechanism 5 downwards, and scraping the old film adhered to the film partition board by the scraping blade 53; the automatic film scraping mechanism 5 scrapes the adjacent surfaces of the adjacent film partition plates, and completely scrapes off the films between the adjacent film partition plates; the automatic film scraping mechanism 5 is retracted to the initial position;

adjusting the rack assembly 3 to move along the Y-axis direction again, aligning the automatic film placing mechanism 61 in the automatic film loading mechanism 6 to any one of the adjacent surfaces of the adjacent film partition plates, moving the gripper 612 gripping a new film downwards along the Z-axis direction until the lower end of the film is flush with the lower end of the film partition plate, moving the adjacent film partition plates until the buckles 12 are buckled and locked with the adjacent film partition plates, and fixing the film between the adjacent film partition plates; the gripper 612 is withdrawn to the initial position and the film is gripped again; opening the automatic film cutting mechanism 62, moving the moving rod III621 along the X-axis direction, and cutting the film sheet by using the film cutting knife 622; the automatic film cutting mechanism 62 is then retracted to the initial position. And finishing the installation and replacement of the film.

In the invention, an operator can input control instructions remotely and enable all the components to work in sequence through the automatic control system, and the design of the control instructions and the control system can be realized through the technology in the prior art, which is not described in detail in the invention.

The membrane and the membrane sheet are of the same meaning in the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", and the like indicate orientations or positional relationships based on an operating state of the present invention, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

The present invention has been described above in connection with preferred embodiments, but these embodiments are merely exemplary and merely illustrative. On the basis of the above, the invention can be subjected to various substitutions and modifications, and the substitutions and the modifications are all within the protection scope of the invention.

Claims (10)

1. The equipment is used for treating radioactive wastewater and can automatically install and replace membranes in a membrane stack, wherein the membrane stack comprises a plurality of membrane partition plates (1) and membranes (2), the equipment comprises a rack assembly (3), and an automatic pulling plate mechanism (4), an automatic membrane scraping mechanism (5) and an automatic membrane installing mechanism (6) which are arranged on the rack assembly (3); the frame assembly (3) can reciprocate along the Y-axis direction, and the automatic plate pulling mechanism (4) can pull apart the adjacent membrane partition plates (1); the automatic film scraping mechanism (5) can remove the old film; the automatic film loading mechanism (6) can install a new film between the adjacent film partition plates (1).

2. The apparatus according to claim 1, wherein the front and rear ends of the membrane partition (1) are provided with baffles (11);

preferably, the baffle (11) is provided with a buckle (12), and the adjacent membrane partition plates (1) can be tightly pressed and locked by the buckle (12); when the film partition (1) is pulled open by opening the buckle (12), the adjacent film partitions can be kept still.

3. The apparatus according to claim 1, characterized in that the frame assembly (3) comprises uprights (31), cross beams (32), a top beam (33) and guide rails (34), the cross beams (32) being located between the uprights (31) and the top beam (33); the number of the upright posts (31) is at least two; the membrane stack is located between two vertical columns (31), and the cross beam (32) and the top beam (33) are located above the membrane stack.

4. The apparatus according to claim 3, wherein the automatic plate pulling mechanism (4) is provided on a column (31) and is capable of reciprocating in an X-axis direction, a Y-axis direction, or a Z-axis direction; the automatic plate pulling mechanism (4) comprises a plate pulling manipulator which can pull the membrane partition (1) open by pulling the baffle (11) and opening the buckle (12).

5. The apparatus according to claim 1, wherein the automatic film scraping mechanism (5) is arranged on a cross beam (32) of the frame assembly (3) and comprises a movable rod I (51), a fixed rod (52) and a scraping blade (53), the scraping blade (53) is fixed on the fixed rod (52) in parallel, the fixed rod (52) is fixedly connected with the movable rod I (51), the movable rod I (51) is arranged on the cross beam (32) along the Z-axis direction, and the movable rod I (51) can move up and down along the Z-axis direction and simultaneously drives the fixed rod (52) and the scraping blade (52) to move up and down; preferably, the number of the automatic film scraping mechanisms (5) is two; the length of the scraping blade is not less than the width of the membrane.

6. The apparatus according to claim 1, wherein the automatic film loading mechanism (6) comprises an automatic film placing mechanism (61) which comprises a roller (611) on which the film is wound, a gripper (612) and a moving rod II (613), the roller (611) is arranged on the top beam (33) in parallel, the gripper (612) is arranged on the cross beam (32) and arranged below the roller (611) in parallel, the gripper (612) can grip the film, the gripper is also fixedly connected with the moving rod II (613), the moving rod II (613) is arranged on the cross beam (32) in the Z-axis direction, and the moving rod I (51) can move up and down in the Z-axis direction and simultaneously drives the gripper (612) to move up and down.

7. The apparatus according to claim 6, wherein the automatic film loading mechanism (6) further comprises an automatic film cutting mechanism (62) which is arranged in parallel below the gripper (612) and above the film partition (1), which can move back and forth along the X-axis direction, and which can cut off the film sheet along the X-axis direction; preferably, one end of the automatic film cutting mechanism (62) is a moving rod III (621), the other end is a film cutting knife (622), the moving rod III (621) is arranged on the cross beam along the X-axis direction and can move back and forth along the X-axis direction, and meanwhile, the film cutting knife (622) is driven to move back and forth; more preferably, an inductor is mounted on the film cutting knife (622).

8. The apparatus according to claim 1, characterized in that it further comprises an automatic hold-down mechanism (7) located inside the frame assembly (3); the automatic pressing mechanism (7) comprises a first pressing plate (71), a second pressing plate (72) and a transmission rod (73), and the first pressing plate (71) and the second pressing plate (72) are respectively arranged at two ends of the film stack along the Y-axis direction; the transmission rod (73) is connected with the first pressing plate (71) and the second pressing plate (72), and the second pressing plate (72) can move towards the first pressing plate (71) or move reversely through the rotation of the transmission rod (73); preferably, the transmission rod (73) is a threaded rod.

9. The apparatus according to claim 1, characterized in that the front and rear ends of the film stack are further provided with guide plates (20) parallel to the drive rods (73) enabling the fixing of the film partitions (1) in the X-axis direction.

10. A method for automatically handling a film web, preferably with an apparatus according to any of claims 1 to 9, comprising the steps of:

firstly, opening a second pressure plate (72) in the automatic pressing mechanism (7); then, an automatic plate pulling mechanism (4) is utilized to pull apart a membrane partition plate (1); then, removing the old membrane adhered to the membrane partition plate (1) by using an automatic membrane scraping mechanism (5); and then a new membrane is installed by utilizing the automatic membrane installing mechanism (6).

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