CN105537181B - A kind of bad cleaning device of silk-screen printing and its cleaning method - Google Patents

Abstract

The invention discloses a production line for cleaning bad screen printing sheets and a cleaning method thereof, which sequentially comprises a feeding device (1), a soaking device (2), a front washing device (3), a back washing device (4), The drying device (5) and the discharge device (6) are connected through the conveying device (7) in the middle, and the running track (8) is arranged on both sides, and the positioning device (9) is evenly distributed along the length direction of the running track (8). ), 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 translation control device for controlling the forward and backward movement of the rotation control device. The beneficial effect of the present invention is that the defective screen printing sheet is clamped or loosened by the translation control device, and the defective screen printing sheet is reversed by the rotation control device to realize front and back cleaning and realize automatic cleaning of the defective screen printing sheet.

Description

A kind of cleaning device and cleaning method for bad screen printing film

technical field

The invention relates to the field of machinery, in particular to a device for cleaning bad screen printing sheets and a cleaning method 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 cleaning production line for defective screen printing sheets, from front to back It includes a feeding device, a soaking device, a front flushing device, a reverse flushing device, a drying device and a discharging device in turn, and the feeding device, the soaking device, the front flushing device, the reverse flushing device, the drying device and the discharging device The conveying device is used to penetrate through the connection. The two sides of the conveying device are provided with running tracks parallel to the conveying device. The running track is evenly distributed with positioning devices along the length direction. The positioning devices include fixed clamping blocks, The rotation control device for controlling the rotation of the fixed clamp block, 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, and the output of the translation control device The end is connected with the rotation control device, and the fixed clamp block is fixed at 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.

Preferably, 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 rod on the central axis of the first motor, and used for fixing the As for the fixing device of the rotation 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.

Preferably, 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, and the outer surface of the screw rod is provided with threads, The directions of the external threads of the two parts are opposite, and the two fixing devices are respectively provided with a nesting opening 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.

Preferably, 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 above-mentioned 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.

Preferably, 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, the The first 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.

Preferably, 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 It is a slope inclined to the clamp fixing section.

Preferably, a buffer layer is provided on the inside of 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.

Preferably, 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.

Preferably, the transition section is a curve, and the included angle between the tangent line and the bottom surface of the fixed clamp gradually increases from the tip of the fixed 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.

A cleaning method utilizing the above-mentioned cleaning production line, comprising the steps of:

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

Step 2: The positioning devices located on the running track on both sides of the conveying device move closer to the middle under the drive of the first motor 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: Driven by the second motor, the positioning device drives the bad screen printing sheet to turn over 180°, and then flushes the reverse side through the backside flushing device. 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, the positioning device moves to both sides under the drive of the first motor, so that the bad screen printing film is separated from the fixed clamping block and falls on the discharge Cleaning is completed on the conveying device in the device.

The positioning device is used to automatically position and turn over, and through one soak, front and back flushing, the cleaning effect of the defective film is improved, so that the defective film after cleaning has reached the standard of recycling and reuse, and the automation of the cleaning of the defective film has been realized. operate.

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.

Preferably, the composition of the cleaning solution in the soaking device is a mixture of NaOH and KOH, and the pH value of the solution is greater than 10.

Preferably, the composition of the cleaning solution of the front flushing device and the back flushing device is a mixture of hydrofluoric acid and nitric acid, and the volume ratio of nitric acid to hydrofluoric acid is 1:1-2.

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 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 cleaning of defective sheets is realized. automated operations;

(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.

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 a second structure diagram of a preferred fixing clamp block 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 feeding device 1, a soaking device 2, a front flushing device 3, a reverse flushing device 4, a drying device 5 and a discharge device 6 from front to back. The feeding device 1 , the soaking device 2 , the front washing device 3 , the back washing device 4 , the drying device 5 and the discharging device 6 are connected through a conveying device 7 .

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.

This embodiment also provides a cleaning method for cleaning the production line by using the above-mentioned bad screen printing sheets, which includes 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 devices 9 located on the running track 8 on both sides of the conveying device 7 move closer to the middle under the drive of the first motor 11 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°, preferably 45°, the velocity of the water flow is 0.3-0.6m/s, preferably 0.4m/s, and the water temperature is 30-60°C, preferably 40°C;

Step 4: Driven by the second motor 13, the positioning device 9 drives the bad screen printing film to turn over 180°, and then flushes the reverse side through the reverse side flushing device 4, and the angle between the flushing water flow direction and the horizontal direction is less than 60°, preferably 45° , the velocity of the water flow is 0.3-0.6m/s, preferably 0.4m/s, and the water temperature is 30-60°C, preferably 40°C;

Step 5: After the bad screen printing film is dried by the drying device 5, the positioning device 9 moves to both sides under the drive of the first motor 11, so that the bad screen printing film is separated from the fixing clamp 20 and falls on the Cleaning is completed on the conveying device 7 in the discharge device 6 .

The composition of the cleaning liquid in the soaking device 2 is a mixture of NaOH and KOH, and the pH value of the solution is greater than 10, preferably 12.

The composition of the cleaning solution in the front flushing device 3 and the back flushing device 4 is a mixture of hydrofluoric acid and nitric acid, and the volume ratio of nitric acid to hydrofluoric acid is 1:1-2, preferably 1:1.5.

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 production line for cleaning bad screen printing sheets, characterized in that it includes a feeding device (1), a soaking device (2), a front washing device (3), a back washing device (4), a drying device (5) and discharge device (6), the feed device (1), soaking device (2), front flushing device (3), reverse flushing device (4), drying device (5) and discharge The devices (6) are connected through the conveying device (7). The two sides of the conveying device (7) are provided with running tracks (8) parallel to the conveying device (7). The running tracks (8) Positioning devices (9) are evenly 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 clamping block ( 20) Fixed at the output end of the rotary control device. 2. A production line for cleaning bad screen printing sheets according to claim 1, characterized in that the translation control device includes a housing (10) slidably mounted on the running track (8), fixed on the The first motor (11) at one end inside the housing (10), the screw rod (18) on the central axis of the first motor (11), the fixing device (15) for fixing the rotation control device, the 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). 3. A production line for cleaning bad screen printing sheets according to claim 2, characterized in that two or more sliding sleeves (12) are fixed inside the housing (10), each of which The sliding sleeve (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). 4. A production line for cleaning bad screen printing sheets according to claim 2, characterized in that the rotation control device includes a second motor (13), a harmonic reducer (16), a first rotating shaft (25 ) and the second rotating shaft (19), the second motor (13) and the harmonic reducer (16) are fixed on the fixing device (15), and the first rotating shaft (25) is fixed on On the central shaft of the second motor (13), one end of the second rotating shaft (19) is fixed on the first rotating shaft (25), and the fixing clamp (20) is fixed on the second rotating shaft Axle (19) other end. 5. A production line for cleaning defective screen printing sheets according to any one of claims 1-4, characterized in that the fixed clamping block (20) includes a clamping mouth ( 21), the jaw (21) includes a fixed section (22) for fixing the edge of the defective sheet and a transition section (23) for pulling up the defective sheet, and the transition section (23) is for the The inclined slope of the jaw fixing section (22). 6 . The production line for cleaning defective screen printing sheets according to claim 5 , wherein a buffer layer ( 24 ) is provided inside the clamp ( 21 ). 7. A production line for cleaning defective screen printing sheets according to claim 6, characterized in that, the lowermost end of the transition section (23) of the fixed clamping block is located on the same plane as the conveying device (7). 8. A cleaning method utilizing the screen printing bad sheet cleaning production line as claimed in claim 6 or 7, is characterized in that, comprises the steps: Step 1: Put 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) moves closer to the middle under the drive of the first motor (11) 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 2~3 minutes, and then goes through the front flushing device (3) for front flushing, and rinses The angle between the water flow direction and the horizontal direction is less than 60°, the water flow speed is 0.3~0.6m/s, and the water temperature is 30~60°C; Step 4: Driven by the second motor (13), the positioning device (9) drives the bad screen printing piece to turn over 180°, and then flushes the reverse side through the reverse side flushing device (4). The angle 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 5: After the bad screen printing pieces are dried by the drying device (5), the positioning device (9) moves to both sides under the drive of the first motor (11), so that the bad screen printing pieces are detached and fixed The clamping block (20) falls on the conveying device (7) in the discharge device (6) to complete the cleaning. 9. The cleaning method according to claim 8, characterized in that, the composition of the cleaning solution in the soaking device (2) is a mixture of NaOH and KOH, and the pH value of the solution is greater than 10. 10. The cleaning method according to claim 9, characterized in that, the composition of the cleaning liquid in the front flushing device (3) and the back flushing device (4) is a mixture of hydrofluoric acid and nitric acid, nitric acid and hydrogen The volume ratio of hydrofluoric acid is 1:1~2.