CN105428219A - Water-cleaning circulating system and production line for substandard sheets produced in silk-screen printing - Google Patents

Abstract

The invention discloses a water-cleaning circulating system for substandard sheets produced in silk-screen printing. The water-cleaning circulating system comprises a soaking apparatus (2), a front surface flushing apparatus (3) and a back surface flushing apparatus (4); a first solution circulating apparatus (29) is arranged in a first liquid outlet (26); the outlet of the first solution circulating apparatus (29) is connected with a first liquid inlet (28); a second solution circulating apparatus (34) is arranged in a second liquid outlet (31); the outlet of the second solution circulating apparatus (34) is connected with a second liquid inlet (33); and filtering apparatuses for filtering solid precipitate are arranged in the first liquid outlet (26) and the second liquid outlet (31). Before the front surface and the back surface of the substandard sheets are cleaned, the substandard sheets are soaked for one time to remove a part of aluminum paste from the surfaces of the substandard sheets as well as to permeate a part of water to the aluminum paste; therefore, the aluminum paste is easy to fall off in the front surface flushing process and the back surface flushing process; the requirement on the water flow speed is lowered; and the separate recycling for aluminum and silver is realized.

Description

A water cleaning circulation system and production line for bad screen printing sheets

technical field

The invention relates to the field of machinery, in particular to a water cleaning circulation system for bad screen printing sheets and a production line thereof.

Background technique

The back electric field and back electrode of crystalline silicon solar energy are located on the back of the solar cell, forming the back and lower electrodes of the silicon cell. Cooperating with the upper electrode on the surface of the silicon cell, it plays the role of transmitting the electric energy generated by the silicon solar cell to the outside world. The positive electrode and the back electrode are made of silver paste, and the back electrode is made of aluminum paste through printing, drying, and sintering.

In the normal production process of cell screen printing, there are often some defective screen printing products caused by abnormal printing. These defective products mainly include incomplete graphics on the front, incomplete graphics on the back, and leakage of aluminum paste on the back of the battery. front or side, etc. Once all these defective printing products are dried and sintered, they will become second-class inferior products if they are mild, and directly produce waste products if they are serious, which will affect the final product qualification rate and conversion rate.

At present, the treatment method for screen-printed defective products of battery sheets is to clean or rinse with water manually, which is inefficient and ineffective, and is not conducive to the production needs of industrialization.

For example, the utility model patent with the notification number CN203536461U discloses a workbench for wiping screen printing defective products, including a desktop, a hollow table arranged on the desktop for placing and absorbing printed defective products, and a support for supporting the desktop. A bracket, and a vacuum pump used to generate negative pressure in the table to absorb printed defective products, the panel of the table is provided with a plurality of small holes, the bottom of the table is provided with through holes, and the through holes pass through the hose Connected to the vacuum pump. When this kind of workbench is used to wipe the screen printing defective products, the silver paste is not easy to stick to the left glove, which is convenient for silver paste recycling; and the silicon wafer is relatively firmly fixed, which improves the work efficiency. This patent adopts a purely manual cleaning method, which has low cleaning efficiency and poor effect, which is not conducive to the production needs of industrialization.

Another example is the invention patent with the notification number CN102437234B disclosing a method for processing defective printed solar cells, which involves ultrasonic cleaning, first water washing, hot hydrochloric acid cleaning, second water washing, and spin-drying of reworked solar cells. And re-screen printing, which solves the problem that the existing printed solar cells cannot be effectively reworked, resulting in waste of resources and increased costs. However, it does not involve the equipment for cell cleaning, nor can it realize automatic cleaning, which has low cleaning efficiency and poor effect, which is not conducive to the production needs of industrialization.

Another example is that the invention patent with the notification number CN100505334B discloses a method for reworking defective products after printing of crystalline silicon solar cells, including three steps: removing the aluminum paste on the back of the cell with HCL cleaning solution; removing the cell with isopropanol Silver paste on the front and back sides; use deep cleaning solution to deep clean the cells that have basically removed the paste, and thoroughly clean away tiny impurities. Through the treatment of this method, the conversion efficiency of the cell can reach the level of a normal cell, and the appearance is no different from that of a normal cell, achieving the purpose of rework and cleaning. The unqualified rate of cell screen printing has been reduced from about 2% to about 0.2%, thereby improving the pass rate and yield of silicon solar cells. However, there is no equipment involved in cell cleaning, and automatic cleaning cannot be realized. The cleaning efficiency is low, the effect is poor, and it is not conducive to the production needs of industrialization.

Contents of the invention

In order to overcome the problems of low cleaning efficiency, poor effect, and unfavorable industrial production needs in the manual cleaning of defective screen printing sheets existing in the prior art, the present invention provides a water cleaning circulation system for defective screen printing sheets, including A soaking device, a front flushing device and a reverse flushing device, the bottom of the soaking device is provided with a first liquid outlet, the top is provided with a first gas outlet, the side is provided with a first liquid inlet, and the first liquid outlet is provided with There is a first solution circulation device, the outlet of the first solution circulation device is connected to the first liquid inlet, the front flushing device and the back flushing device are provided with a water storage tank, and the side of the storage tank is provided with a second Two liquid outlets, the top is provided with a second gas outlet, the side is provided with a second liquid inlet, the second liquid outlet is provided with a second solution circulation device, and the outlet of the second solution circulation device is connected to the first outlet. The two liquid inlets are connected, and the first liquid outlet and the second liquid outlet are provided with a filter device for filtering solid sediments. After that, it is melt-blown non-woven fabric, needle-punched non-woven fabric, and melt-blown non-woven fabric.

The solution in the soaking device is NaOH solution. Using the principle that aluminum can react with alkali in the alkaline solution, the aluminum in the bad sheet is dissolved in the NaOH solution. The reaction equation is:

2Al+3OH ^- +6H ₂ O＝2[Al(OH) ₄ ] ^- +3H ₂ ↑

Hydrogen overflows and recovers from the first gas outlet. In the first solution circulation device, by adjusting the pH value, white flocs are formed in the solution. The flocs are precipitated in the first solution circulation device, and the remaining solution is refluxed to soak In the device, recycling is realized.

The solution in the front flushing device and the back flushing device is a mixed solution of nitric acid and sulfuric acid. The principle that silver can react with acid in an acidic solution is used to dissolve the silver, and then precipitate it in the second solution circulation device to realize recovery.

Further, the first solution circulation device includes a first sedimentation tank, a second sedimentation tank, a third sedimentation tank and a first mixing device from front to back, and the first liquid outlet is connected to the inlet of the first sedimentation tank The third liquid inlet is provided above the first sedimentation tank; the first sedimentation tank, the second sedimentation tank and the third sedimentation tank are equipped with hook stirring devices respectively, and the first sedimentation tank, the second sedimentation tank The outlets of the sedimentation tank and the third sedimentation tank are provided with filter screens 40 for filtering flocculent sediment. The liquid inlet is an alkaline solution, which can be used to adjust the pH value of the solution. When the solution passes through the filter, the flocs are blocked on its entry surface, so as to achieve separation. After three times of filtration, the aluminum-containing flocs can be effectively improved. recovery rate.

Further, the filter net includes three layers, which are a woven fabric layer, a needled fabric layer and a woven fabric layer from front to back, wherein the needled fabric layer has a porosity greater than 90%. By setting a filter with a large porosity, the resistance of the solution during filtration is reduced. The apertures of the filter screens on the first sedimentation tank, the second sedimentation tank and the third sedimentation tank are gradually reduced, so that the diameter of the filter flocs in the three sedimentation tanks can be gradually reduced, and by filtering in the first sedimentation tank, the For the filtration of large aluminum-containing flocs, the second sedimentation tank filters out a small amount of large aluminum-containing flocs and a large number of small aluminum-containing flocs, and finally the third sedimentation tank filters out the remaining small aluminum-containing precipitates thing.

In addition, because the structure of the floc itself has a certain filtering effect, it will further improve the filtering performance of the filter net after it is attached to the filter net, especially the filtering performance of small aluminum-containing flocs.

Further, the third sedimentation device is connected to the first mixing device through a pipeline, the outlet of the first mixing device is connected to the first liquid inlet, and the first mixing device is provided with a first replenishment liquid mouth and a first stirring device for mixing the solution. The concentration of the mixed solution is controlled within a set range by adding a certain concentration of NaOH solution. Here, the NaOH solution with a concentration of 30-35% can be selected as the supplementary liquid.

Further, the second solution circulation device includes a fourth sedimentation tank, a filter centrifuge and a second mixing device, the inlet of the fourth sedimentation tank is connected to the second liquid outlet, and the outlet is connected to the inlet of the filter centrifuge , the outlet of the filter centrifuge is connected to the inlet of the second mixing device, the outlet of the second mixing device is connected to the second liquid inlet, and the second mixing device is provided with a second liquid replenishing port and for A second stirring device for mixing solutions.

Further, a fourth liquid inlet is provided on the fourth sedimentation tank.

Adding hydrochloric acid to the fourth sedimentation tank, the silver is precipitated, and the connection between the fourth sedimentation tank and the filter centrifuge is equipped with a filter screen, which can filter most of the silver precipitates, and then pass through the filter centrifuge to further recycle the remaining silver. A certain amount of mixed solution of nitric acid and sulfuric acid is added to the second mixing device so that the concentration of the flushing solution meets the set requirements.

Further, the diameter of the drum of the filter centrifuge is 1000mm, the rotating speed of the drum is 2200r/mm, the separation factor is 2300, and the feed rate is 30-100m2/h. The separation factor of 2300 is very suitable for the filtration of silver precipitates in the solution, and the feeding amount can be adjusted according to the production speed and chemical reaction needs.

Further, the front flushing device and the back flushing device are provided with more than one water spray pipe, each of which is evenly distributed with more than three water spray ports, and the water spray direction and level of the water spray ports are The included angle of the direction is 30-70°. Using multiple water jets to wash in the same direction can avoid the turbulence of the water flow. The direction of the water spray is determined to have an angle of 30-70° with the horizontal direction, which can improve its performance while minimizing the impact of the water flow on the defective sheet. Rinse effect.

Furthermore, the front side can be used for flushing at the same time. When flushing, the defective sheet is placed in a vertical state, and two rows of water spray pipes are provided. The angle between the water spray port and the plane where the defective sheet is located is 30-70°.

The present invention also provides a production line with the above-mentioned water cleaning circulation system for screen printing defective sheets, which sequentially includes a feeding device, a water cleaning circulation system, a drying device, and a discharge device from front to back. The circulation system, the drying device and the discharge device are connected through a conveying device.

Further, the two sides of the conveying device are provided with running tracks parallel to the conveying device, and positioning devices are evenly distributed along the length direction of the running track, and the positioning devices include fixed clamping blocks for controlling the fixing A rotation control device for the rotary motion of the clamp block, a translation control device for controlling the forward and backward movement of the rotation control device, the translation control device is slidably installed on the running track, and the output end of the translation control device is connected to the rotation The control device is connected, and the fixed clamp block is fixed on the output end of the rotation control device.

Clamp or loosen the bad screen printing pieces by the translation control device, and turn over the bad screen printing pieces by the rotation control device to realize front and back cleaning, and realize the automation of cleaning bad screen printing pieces.

Further, the translation control device includes a housing slidably installed on the running track, a first motor fixed at one end inside the housing, a screw on the central axis of the first motor, and used to fix the rotation As for the fixing device of the control device, the outer surface of the screw rod is provided with threads, and the fixing device is provided with a nesting opening whose inner surface fits with the thread of the screw rod. The first motor adopts a servo motor, which converts the rotational motion of the motor spindle into linear motion through the screw drive, which improves the accuracy when the fixed clamp block is clamped.

Further, the screw rod can be divided into two parts, which are respectively located on the running tracks on both sides of the conveying device, and are respectively provided with fixing devices for fixing the rotation control device. The outer surface of the screw rod is provided with threads, and the two parts Part of the external threads are in opposite directions, and the two fixing devices are respectively provided with a nesting port whose inner surface is threadedly matched with the screw rod. The first motor adopts a servo motor, which is driven by a screw to control the rotation control devices on the left and right sides to move to the middle at the same speed to clamp the defective piece. The left and right sides use the same screw to improve the cooperation between the two fixed clamps. accuracy and stability.

Further, more than two sliding sleeves are fixed inside the housing, and each of the sliding sleeves is covered with a slider that can move left and right along the direction of the sliding sleeve, and the sliders are fixed on the On the fixing device, the rotation control device moves along the sliding sleeve, which improves the stability of its linear motion and reduces the impact on the defective piece caused by the uneven sliding when the fixed clamp block contacts the defective piece.

Further, the rotation control device includes a second motor, a harmonic reducer, a first rotating shaft and a second rotating shaft, the second motor and the harmonic reducer are fixed on the fixing device, and the first A rotating shaft is fixed on the central shaft of the second motor, one end of the second rotating shaft is fixed on the first rotating shaft, and the fixing clip is fixed on the other end of the second rotating shaft. The second motor adopts a servo motor, and through precise control of its rotation, the flipping of the fixed clamping block is realized, so as to realize the cleaning of the front and back of the defective film.

Further, the fixed clamping block includes a jaw facing the direction of the conveying device, and the jaw includes a fixed section for fixing the edge of the defective sheet and a transition section for pulling up the defective sheet, and the transition section is A slope inclined to the clamp fixing section.

Further, a buffer layer is provided inside the clamp. It can reduce the impact force brought by the fixed clamp block to the bad piece when it is in contact with the bad piece, or during the cleaning process, and play a buffer role.

Further, the lowermost end of the transition section of the fixed clip is located on the same plane as the conveying device. In this way, the bottom of the fixed clamp block is close to the conveying device in the process of moving to the left, and when it comes into contact with the defective film, the two fixed clamp blocks arranged on the left and right will lift the defective film to the fixed section, so as to realize the fixing of the defective film.

Further, the transition section is a curve, and the angle between the tangent line and the bottom surface of the fixing clamp gradually increases from the tip of the fixing clamp to the jaw, and the maximum included angle is less than 80°C. This can reduce the horizontal pressure on the edge of the bad piece when it reaches the fixed section, and reduce the impact on the quality of the bad piece.

The present invention also provides a kind of production method utilizing above-mentioned cleaning production line, comprises the following steps:

Step 1: Put the bad screen printing sheet on the conveying device in the feeding device;

Step 2: The positioning device located on the running track on both sides of the conveying device controls the translation control device to clamp the bad screen printing film in the middle;

Step 3: The positioning device drives the bad screen printing film into the soaking device, soaks in the cleaning solution of the soaking device for 2 to 3 minutes, and performs frontal flushing through the frontal flushing device, the angle between the flushing water flow direction and the horizontal direction is less than 60°, The speed of the water flow is 0.3-0.6m/s, and the water temperature is 30-60°C;

Step 4: The positioning device controls the rotation control device to drive the screen printing bad sheet to turn over 180°, and then flushes the reverse side through the reverse side flushing device. The angle between the flushing water flow direction and the horizontal direction is less than 60°, and the water flow speed is 0.3-0.6 m/s, the water temperature is 30-60°C;

Step 5: After the bad screen printing piece is dried by the drying device, the positioning device controls the translation control device to move to both sides, so that the bad screen printing piece breaks away from the fixed clamping block and falls into the discharge device. On the conveying device, the cleaning is completed.

Preferably, the cleaning solution in the soaking device is NaOH solution, the solution concentration is 27%, and the temperature is controlled at 22°C; the cleaning solution in the front flushing device and the back flushing device is a mixed solution of nitric acid and hydrochloric acid, and the solution The concentration of the hydrochloric acid is 5mol/L, and the ratio of the nitric acid to the hydrochloric acid is 3:1.

The positioning device is used to automatically position and turn over, and through one-time soaking, front flushing and reverse flushing, the cleaning effect of defective sheets is improved, so that the defective sheets after cleaning reach the standard of recycling and reuse, and the automatic operation of cleaning defective sheets is realized. .

Before cleaning the front and back sides, it is soaked once, which can not only remove part of the aluminum paste on the surface of the bad sheet, but also penetrate a part of the water into the silver paste on the surface, so that in the process of front washing and reverse washing, the silver The slurry is easier to shed, reducing the requirement for water flow speed. This method also enables separate recovery of aluminum and silver.

Compared with prior art, the beneficial effect of the present invention is:

(1) The positioning device is adopted, which includes a balance control device and a rotation control device. The bad screen printing film is clamped or loosened by the translation control device, and the bad screen printing film is turned over by the rotation control device to realize front and back cleaning , to realize the automation of screen printing bad film cleaning;

(2) The first motor adopts a servo motor, which converts the rotational motion of the motor spindle into a linear motion through the screw drive, which improves the accuracy of the clamping block;

(3) More than two sliding sleeves are fixed on the inner side of the housing, and the rotation control device moves along the sliding sleeves, which improves the stability of its linear motion and reduces the unevenness caused by sliding when the fixed clamp block contacts with the bad piece. Impact force caused by defective film;

(4) There is a buffer layer on the inner side of the jaw to reduce the impact force on the defective film when the fixed clamp block is in contact with the defective film, or during the cleaning process, and play a buffer role;

(5) The jaw includes a transition section for pulling up defective pieces. The transition section is a curve, and the angle between the tangent line and the bottom surface of the fixed jaw increases gradually from the tip of the fixed jaw to the jaw, and the maximum included angle is less than 80°C. This can reduce the horizontal pressure on the edge of the bad film when it reaches the fixed section, and reduce the impact on the quality of the bad film;

(6) The positioning device is used to automatically position and turn over, and through one-time soaking, front flushing and back flushing, the cleaning effect of the defective sheets is improved, so that the defective sheets after cleaning have reached the standard of recycling and reuse, and the defective sheets have been realized. Automated operation of cleaning;

(7) Before cleaning the front and back sides, soak once, not only can remove part of the aluminum paste on the surface of the bad sheet, but also can penetrate part of the water into the silver paste on the surface, so that the process of front and reverse flushing In the process, the silver paste is easier to fall off, which reduces the requirement on the water flow speed, and can realize the separate recovery of aluminum and silver.

(8) Install the first solution circulation device and the second solution circulation device, through the solution circulation, filter out aluminum-containing flocs and silver precipitates during the circulation process, and then supplement certain solutes to realize the recycling of the solution.

Description of drawings

Fig. 1 is a preferred production line block diagram of the present invention;

Fig. 2 is a preferred block flow diagram of the present invention;

Fig. 3 is a structural diagram 1 of a preferred positioning device of the present invention;

Fig. 4 is the structure drawing 2 of the preferred positioning device of the present invention;

Fig. 5 is a structural drawing of a preferred fixed clamp block of the present invention;

Fig. 6 is the second structure diagram of the preferred fixed clamp block of the present invention;

Fig. 7 is a structural diagram of a preferred first solution circulation device of the present invention;

Fig. 8 is a structural diagram of a preferred second solution circulation device of the present invention.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

As shown in Figure 1, it is a block diagram of a preferred production line of the present invention, which includes a feed device 1, a water cleaning circulation system, a drying device 5 and a discharge device 6 from front to back, and the feed device 1, the water cleaning circulation system, The drying device 5 and the discharge device 6 are connected through a conveying device 7 , and the water cleaning circulation system includes a soaking device 2 , a front flushing device 3 and a reverse flushing device 4 .

As shown in Figure 2, it is a preferred flow chart of the present invention, the bad screen printing sheet is fed through the feeding device 1, and the positioning device 9 positions it, then soaks through the soaking device 2, and the front flushing device 3 performs front flushing. Then turn over 180° by the positioning device 9, and then wash the back side by the back side washing device 4, and then discharge the material after being dried by the drying device 5, so as to obtain battery chips that can be used for recycling.

As shown in Figure 3, it is a preferred positioning device structure diagram one of the present invention. At this time, the positioning device 9 is in the state before positioning. As shown in Figure 4, it is a preferred positioning device structure diagram of the present invention. In the rear state, the two sides of the conveying device 7 are provided with running rails 8 parallel to the conveying device 7, and the running rails 8 are evenly distributed with positioning devices 9 along the length direction. The positioning devices 9 include fixed clamping blocks 20 for controlling the The rotation control device for the rotation movement of the fixed clamp block 20, the translation control device for controlling the forward and backward movement of the rotation control device, the translation control device is slidably installed on the running track 8, the output end of the translation control device Connected with the rotation control device, the fixed clamp block 20 is fixed at the output end of the rotation control device.

The translation control device includes a housing 10 slidably mounted on the running track 8, a first motor 11 fixed at one end inside the housing 10, a screw 18 on the central axis of the first motor 11, and a screw rod 18 for fixing the The fixing device 15 of the rotation control device, the outer surface of the screw rod 18 is provided with threads, and the fixing device 15 is provided with a nesting opening 17 whose inner surface is threadedly matched with the screw rod 18 .

The inner side of the housing 10 is also fixedly provided with more than two sliding sleeves 12, each of the sliding sleeves 12 is covered with a slider 14 that can move left and right along the direction of the sliding sleeve 12, and the sliders 14 are fixed on the On the fixing device 15; the rotation control device includes a second motor 13, a harmonic speed reducer 16, a first rotating shaft 25 and a second rotating shaft 19, and the second motor 13 and the harmonic reducing gear 16 are fixed On the fixing device 15, the first rotating shaft 25 is fixed on the central axis of the second motor 13, one end of the second rotating shaft 19 is fixed on the first rotating shaft 25, and the fixing clip The block 20 is fixed on the other end of the second rotating shaft 19 . The second motor 13 adopts a servo motor, and realizes the overturning of the fixed clamping block by precisely controlling its rotation, thereby realizing the cleaning of the front and back of the bad sheet.

As a preferred embodiment, the screw rod 18 can be divided into two parts, which are respectively located on the running rails 8 on both sides of the conveying device 7, and are respectively provided with a fixing device 15 for fixing the rotation control device. The outer surface of the rod 18 is threaded, and the directions of the outer threads of the two parts are opposite. The two fixing devices 15 are respectively provided with a nesting opening 17 whose inner surface is threadedly matched with the screw rod 18 . The first motor 11 adopts a servo motor, which is driven by a screw rod 18 to control the rotation control devices on the left and right sides to move at the same speed in the middle to clamp the defective sheet. Precision and stability when mating.

As shown in Fig. 5, it is a preferred structure diagram of the fixed clamping block of the present invention. The fixed clamping block 20 includes a jaw 21 facing the direction of the conveying device 7, and the jaw 21 includes a fixing section 22 for fixing the edge of the defective piece. And a transition section 23 for pulling up the defective piece, the transition section 23 is a slope inclined to the clamp fixing section 22; a buffer layer 24 is provided inside the clamp 21.

The lowermost end of the fixed clip transition section 23 is located on the same plane as the conveying device 7 .

As shown in Fig. 6, it is the structure diagram 2 of the preferred fixed clamping block of the present invention. The fixed clamping block 20 includes a jaw 21 facing the direction of the conveying device 7, and the jaw 21 includes a fixing section 22 for fixing the edge of the defective sheet. And be used for dragging the transition section 23 of described defective sheet, transition section 23 is a curve, and the included angle of its tangent line and fixed clamp block 20 bottom surfaces increases gradually from fixed clamp block 20 tip to jaw 21 direction, and maximum included angle is less than 80 ℃. This can reduce the horizontal pressure on the edge of the bad piece when it reaches the fixed section, and reduce the impact on the quality of the bad piece.

As shown in Figure 7, it is a structural diagram of a preferred first solution circulation device of the present invention. The bottom of the soaking device 2 is provided with a first liquid outlet 26, the top is provided with a first gas outlet 27, and the side is provided with a first liquid inlet. 28, the first liquid outlet 26 is provided with a first solution circulation device 29, the outlet of the first solution circulation device 29 is connected to the first liquid inlet 28; the first solution circulation device 29 includes the former Include the first settling tank 35, the second settling tank 36, the third settling tank 37 and the first mixing device 38 in turn, the first liquid outlet 26 is connected with the first settling tank 35 inlet, the second settling tank 35 A third liquid inlet 39 is provided above a settling tank; a hook-shaped stirring device is respectively housed in the first settling tank 35, the second settling tank 36 and the third settling tank 37, and the first settling tank 35, the second settling tank The outlets of the second settling tank 36 and the third settling tank 37 are provided with filter screens 40 for filtering flocculent sediment. The first liquid outlet 26 and the second liquid outlet 31 are provided with a filter device for filtering solid sediments, and the filter device is composed of three layers of non-woven fabrics that are compounded by needle punching. Meltblown nonwovens, needle punched nonwovens, meltblown nonwovens.

The filter screen 40 includes three layers, which are woven cloth layer, needle punched cloth layer and woven cloth layer successively from front to back, wherein the porosity of the needle punched cloth layer is greater than 90%, the third settling device 37 is connected with the first A mixing device 38 is connected by a pipeline, and the outlet of the first mixing device 38 is connected to the first liquid inlet 28, and the first mixing device 38 is provided with a first liquid replenishment port 41 and a socket for mixing solutions. first stirring device. The apertures of the filter screens on the first sedimentation tank, the second sedimentation tank and the third sedimentation tank are gradually reduced, so that the diameter of the filter flocs in the three sedimentation tanks can be gradually reduced, and by filtering in the first sedimentation tank, the For the filtration of large aluminum-containing flocs, the second sedimentation tank filters out a small amount of large aluminum-containing flocs and a large number of small aluminum-containing flocs, and finally the third sedimentation tank filters out the remaining small aluminum-containing precipitates things.

In addition, because the structure of the floc itself has a certain filtering effect, it will further improve the filtering performance of the filter net after it is attached to the filter net, especially the filtering performance of small aluminum-containing flocs.

As shown in Figure 8, it is a structural diagram of a preferred second solution circulation device of the present invention. A water storage tank 30 is provided below the front flushing device 3 and the back flushing device 4, and a second liquid outlet 31 is provided on the side of the storage tank 30. , the top is provided with a second gas outlet 32, the side is provided with a second liquid inlet 33, the second liquid outlet 31 is provided with a second solution circulation device 34, and the outlet of the second solution circulation device 34 is connected to the The second liquid inlet 33 is connected to each other.

The second solution circulation device 42 comprises a fourth settling tank 43, a filter centrifuge 44 and a second mixing device 45, the entrance of the fourth settling tank 43 is connected with the second liquid outlet 31, and the outlet is connected with the filter centrifuge 44 inlet, the filter centrifuge 44 outlet is connected to the second mixing device 45 inlet, the second mixing device 45 outlet is connected to the second liquid inlet 33, and the second mixing device 45 is equipped with There is a second replenishment port 46 and a second stirring means for mixing the solutions.

The fourth sedimentation tank 43 is provided with a fourth liquid inlet 47 .

The diameter of the drum of the filter centrifuge 44 is 1000 mm, the rotating speed of the drum is 2200 r/mm, the separation factor is 2300, and the feed rate is 30-100 m2/h.

The front flushing device 3 and the back flushing device 4 are equipped with more than one water spray pipe, and each of the water spray pipes is evenly distributed with more than three water spray ports, and the water spray direction of the water spray port is the same as that of the water spray port. The included angle in the horizontal direction is 30-70°.

The two sides of conveying device 7 are provided with running track 8 that is arranged in parallel with described conveying device 7, and described running track 8 is evenly distributed with positioning device 9 along the length direction, and described positioning device 9 comprises fixed clamping block 20, is used to control The rotation control device for the rotation movement of the fixed clamp block 20, the translation control device for controlling the forward and backward movement of the rotation control device, the translation control device is slidably installed on the running track 8, the output of the translation control device The end is connected with the rotation control device, and the fixed clamp block 20 is fixed at the output end of the rotation control device.

This embodiment also provides a production method for cleaning the production line by using the above-mentioned bad screen printing sheet, including the following steps:

Step 1: placing the bad screen printing sheet on the conveying device 7 in the feeding device 1;

Step 2: The positioning device 9 located on the running track 8 on both sides of the conveying device 7 controls the translation control device to clamp the bad screen printing film in the middle;

Step 3: The positioning device 9 drives the bad screen printing film into the soaking device 2, soaks in the cleaning solution of the soaking device 2 for 2 to 3 minutes, and performs frontal flushing through the front flushing device 3, the angle between the direction of the flushing water flow and the horizontal direction Less than 60°, the velocity of the water flow is 0.3-0.6m/s, and the water temperature is 30-60°C;

Step 4: The positioning device 9 controls the rotation control device to drive the bad screen printing sheet to turn over 180°, and then flushes the reverse side through the reverse side flushing device 4, the angle between the direction of the flushing water flow and the horizontal direction is less than 60°, and the speed of the water flow is 0.3 ～0.6m/s, the water temperature is 30～60℃;

Step 5: After the bad screen printing film is dried by the drying device 5, the positioning device 9 controls the translation control device to move to both sides, so that the bad screen printing film is separated from the fixed clamping block 20 and falls on the discharge On the conveying device 7 in the device 6, cleaning is completed.

The cleaning liquid in the soaking device 2 is NaOH solution, the solution concentration is 27%, and the temperature is controlled at 22°C; the washing liquid in the front flushing device 3 and the back flushing device 4 is a mixed solution of nitric acid and sulfuric acid, and the concentration of the solution is is 5mol/L, and the ratio of the nitric acid to the sulfuric acid is 3:1.

The foregoing description shows and describes preferred embodiments of the present invention, and as previously stated, it is to be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments but may be applied to various other embodiments. Combinations, modifications and circumstances, and can be modified within the scope of the inventive concept described herein, by the above teachings or by skill or knowledge in the relevant field. However, changes and changes made by those skilled in the art do not depart from the spirit and scope of the present invention, and should all be within the protection scope of the appended claims of the present invention.

Claims (10)

1. A water cleaning circulation system for screen printing bad sheets, characterized in that it comprises a soaking device (2), a front flushing device (3) and a reverse flushing device (4), and the bottom of the soaking device (2) is provided with a second A liquid outlet (26), the top is provided with the first air outlet (27), the side is provided with the first liquid inlet (28), and the first solution circulation device (26) is provided with the first liquid outlet ( 29), the outlet of the first solution circulation device (29) is connected to the first liquid inlet (28), and a water storage tank ( 30), the side of the storage tank (30) is provided with a second liquid outlet (31), the top is provided with a second gas outlet (32), the side is provided with a second liquid inlet (33), and the second outlet The liquid port (31) is provided with a second solution circulation device (34), the outlet of the second solution circulation device (34) is connected to the second liquid inlet (33), and the first liquid outlet (26 ) and the second liquid outlet (31) are provided with a filter device for filtering solid sediments. The filter device includes a three-layer non-woven fabric that is compounded by needle punching, and is sequentially melt-blown non-woven fabric from front to back. , Needle-punched non-woven fabrics, melt-blown non-woven fabrics. 2. A kind of screen printing bad sheet water cleaning circulation system as claimed in claim 1, is characterized in that, described first solution circulation device (29) comprises from front to back and comprises first settling tank (35), the second Two sedimentation tanks (36), the third sedimentation tank (37) and the first mixing device (38), the first liquid outlet (26) is connected to the inlet of the first sedimentation tank (35), and the first A third liquid inlet (39) is provided above the sedimentation tank; a hook-shaped stirring device is respectively housed in the first sedimentation tank (35), the second sedimentation tank (36) and the third sedimentation tank (37), and the The outlets of the first sedimentation tank (35), the second sedimentation tank (36) and the third sedimentation tank (37) are all equipped with filter screens (40) for filtering flocculent sediments. 3. A kind of screen printing bad sheet water cleaning circulation system as claimed in claim 2, it is characterized in that, described filter screen (40) comprises three layers, is woven cloth layer successively from front to back, needle-punched cloth layer and a woven fabric layer, wherein the porosity of the needled fabric layer is greater than 90%. 4. A kind of screen printing poor sheet water cleaning circulation system as claimed in claim 2, is characterized in that, between the described third settling device (37) and the described first mixing device (38) are connected by pipelines, The outlet of the first mixing device (38) is connected to the first liquid inlet (28), and the first mixing device (38) is provided with a first replenishment port (41) and a first blender. 5. A kind of screen printing bad sheet water cleaning circulation system as claimed in claim 1, is characterized in that, described second solution circulation device (42) comprises the 4th settling tank (43), filter centrifuge (44) With the second mixing device (45), the inlet of the fourth settling tank (43) is connected with the second liquid outlet (31), and the outlet is connected with the inlet of the filter centrifuge (44), and the filter centrifuge (44) the outlet is connected with the inlet of the second mixing device (45), the outlet of the second mixing device (45) is connected with the second liquid inlet (33), and in the second mixing device (45) A second liquid replenishment port (46) and a second stirring device for mixing solutions are provided. 6. A water cleaning circulation system for bad screen printing sheets according to claim 5, characterized in that a fourth liquid inlet (47) is provided on the fourth sedimentation tank (43). 7. A kind of screen printing bad sheet water cleaning circulation system as claimed in claim 1, it is characterized in that, more than one spray nozzles are all provided in the front flushing device (3) and the reverse flushing device (4). Each of the water pipes is evenly distributed with more than three water spouts, and the included angle between the water spout direction of the water spouts and the horizontal direction is 30-70°. 8. A production line with a screen printing bad sheet water cleaning circulation system as claimed in any one of claims 1-7, characterized in that it comprises a feeding device (1), a water cleaning circulation system, a drying The drying device (5) and the discharging device (6), the feeding device (1), the water cleaning circulation system, the drying device (5) and the discharging device (6) are connected through a conveying device (7) . 9. The production line according to claim 8, characterized in that, both sides of the conveying device (7) are provided with running tracks (8) parallel to the conveying device (7), and the running tracks (8) Positioning devices (9) are uniformly distributed along the length direction, and the positioning device (9) includes a fixed clamp block (20), a rotation control device for controlling the rotational movement of the fixed clamp block (20), and a rotation control device for controlling the fixed clamp block (20). The translation control device for the forward and backward movement of the rotation control device, the translation control device is slidably installed on the running track (8), the output end of the translation control device is connected with the rotation control device, and the fixed clamp block ( 20) Fixed at the output end of the rotary control device. 10. The production line according to claim 9, characterized in that the translation control device comprises a housing (10) slidably mounted on the running track (8), one end fixed on the inside of the housing (10) The first motor (11), the screw mandrel (18) on the central axis of the first motor (11), the fixing device (15) for fixing the rotation control device, the outer surface of the screw mandrel (18) is provided There are threads, and the fixing device (15) is provided with a nesting port (17) whose inner surface is threadedly matched with the screw rod (18); the inner side of the housing (10) is also fixedly provided with more than two slides. Sleeves (12), each of the sliding sleeves (12) is covered with a slider (14) that can move left and right along the direction of the sliding sleeve (12), and the sliders (14) are all fixed on the fixing device (15) on.