Silk screen slurry recovery device

Abstract

The utility model discloses a silk screen slurry recovery device which is highly matched with an existing screen plate, the screen plate is arranged between a first rolling shaft and a third rolling shaft, one end of the screen plate is tangent to the lowest point of the first rolling shaft, and an inclined angle is formed between the axis connecting line of the first rolling shaft and a second rolling shaft and the horizontal plane. The slurry is transferred to the conveying belt from the screen plate under the action of tangential force and friction force, so that the automatic and efficient transfer of the slurry from the screen plate to the conveying belt is realized; in addition, the uniformly distributed grooves are formed in the surface of the conveying belt, so that the slurry can be stably attached to the surface of the conveying belt; and the scraper strip is arranged between the second rolling shaft and the third rolling shaft, so that the slurry conveyed by the conveying belt can be scraped into the collecting device, and therefore, automatic and efficient collection and reliable recovery of the slurry are realized through the arrangement of the overall structure, and the slurry recovery efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to solar cell manufacturing technical field especially relates to a silk screen printing paste recovery device. BACKGROUND

[0002] In the solar cell manufacturing process, the silk screen printing paste is a kind of key material, mainly used to form electrode on the surface of cell piece. In the silk screen printing process, paste is printed to the surface of silicon wafer through silk screen template, and forms the positive and negative electrode of cell piece. Paste is usually composed of silver powder, glass powder and organic carrier etc., and its cost is only less than silicon wafer in cell piece production, so the recycling of paste is of great significance to reduce production cost.

[0003] At present, the paste remaining on the screen plate after silk screen printing is mainly recycled by the following ways: one is to use manual scraper to scrape off the residual paste from the screen plate and recycle, which is time-consuming and laborious, and the production efficiency is low;Another is to use solvent to dissolve and clean the residual paste, and then recycle the paste through filtering process, which not only increases the recycling process and prolongs the recycling time, but also uses the solvent with irritating smell, which has environmental protection hidden danger. SUMMARY

[0004] The utility model aims at providing a silk screen printing paste recovery device to improve the efficiency of paste recycling.

[0005] The utility model provides a silk screen printing paste recovery device, which comprises:

[0006] The transmission device comprises a support, a first roller, a second roller and a third roller arranged at both ends of the support, and a conveyor belt arranged on the outer circumferential surface of the first roller, the second roller and the third roller.

[0007] The outer surface of the conveyor belt has a plurality of grooves uniformly distributed along the extension direction of the conveyor belt;The axial height of the second roller is higher than the axial height of the first roller;The axial center line of the first roller and the second roller forms an acute angle with the horizontal plane.

[0008] The screen plate is used to carry paste, and is located between the first roller and the third roller, and one end is tangent to the lowest point of the first roller.

[0009] The scraper strip is arranged on the outer surface of the conveyor belt and located between the second roller and the third roller, and is used to scrape the paste into the collecting device.

[0010] The driving device is used to drive the conveyor belt to move from the first roller to the third roller.

[0011] Further, the second roller has a higher axial height than the third roller.

[0012] Further, the first roller and the second roller have an axial line that forms an angle of 5-15° with the horizontal plane.

[0013] Further, the conveying device further comprises a middle roller between the first roller and the third roller, and an extension support connected to the axial center of the middle roller.

[0014] Further, the device further comprises a cleaning device arranged on the outer surface of the conveying belt near the middle roller.

[0015] Further, the device further comprises auxiliary wheels arranged on both sides of the screen plate along a first direction, wherein the first direction is the extension direction of the axial line of the middle roller and the first roller.

[0016] Further, the device further comprises a handle connected to the axial center of the second roller through the support.

[0017] Further, the scraper strip is fixed on the support between the second roller and the third roller.

[0018] Further, the scraper strip has a wedge-shaped structure with narrowed sides.

[0019] Further, the material of the conveying belt comprises polyurethane or silica gel.

[0020] Compared with the prior art, the device has at least the following technical effects:

[0021] The screen plate carrying the slurry is arranged between the first roller and the third roller, and one end is tangent to the lowest point of the first roller, and the axial line of the first roller and the second roller forms an angle with the horizontal plane, so that the slurry is transferred from the screen plate to the conveying belt under the action of the tangential force and the friction force, thereby realizing automatic and efficient transfer of the slurry from the screen plate to the conveying belt. In addition, the conveying belt surface is provided with uniformly distributed grooves, so that the slurry can be stably attached to the conveying belt surface. The scraper strip is arranged between the second roller and the third roller, and can scrape the slurry conveyed by the conveying belt into the collecting device. It can be seen that the overall structure realizes automatic and efficient collection and reliable recycling of the slurry, and improves the slurry recycling efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the silk screen slurry recycling device.

[0023] Figure 2A schematic diagram of the structure of the screen plate. DETAILED DESCRIPTION

[0024] A wire mesh slurry recovery device according to the present application will now be described with reference to the accompanying schematic drawings, in which the preferred embodiments of the present application are illustrated. It should be understood that modifications can be made to the present application as described herein without departing from the spirit and scope of the present application, which are set forth in the following claims. Accordingly, the following description should be understood as being illustrative of the broader aspects of the present application and not limiting of the present application.

[0025] The present application will now be described in more detail, by way of example only, with reference to the accompanying drawings. The advantages and features of the present application will become apparent from the following description of the preferred embodiments. It should be understood, however, that the description of the preferred embodiments is meant to be illustrative only and not limiting of the present application, which is set forth in the claims.

[0026] Reference will now be made to Figure 1 The present application discloses a wire mesh slurry recovery device, comprising:

[0027] A transmission device, comprising a support, a first roller 1, a second roller 4 and a third roller 12 arranged at both ends of the support, and a conveyor belt 2 arranged around the outer circumferential surface of the first roller 1, the second roller 4 and the third roller 12.

[0028] The outer surface of the conveyor belt 2 has a plurality of grooves uniformly distributed along the extension direction of the conveyor belt 2; the axial height of the second roller 4 is higher than the axial height of the first roller 1; and the axial line of the first roller 1 and the second roller 4 forms an acute angle with the horizontal plane.

[0029] A screen plate 14 for carrying slurry 15, the screen plate 14 being located between the first roller 1 and the third roller 12, and one end being tangent to the lowest point of the first roller 1.

[0030] A scraper strip 6 arranged on the outer surface of the conveyor belt 2, located between the second roller 4 and the third roller 12, the scraper strip 6 being used to scrape the slurry 15 into the collecting device.

[0031] A driving device for driving the conveyor belt 2 to move from the first roller 1 to the third roller 12.

[0032] The screen slurry recycling device disclosed by the utility model is highly adaptive to the current screen plate 14, the screen plate 14 is arranged between the first roller shaft 1 and the third roller shaft 12, one end is tangent to the lowest point of the first roller shaft 1, and the axis connecting line of the first roller shaft 1 and the second roller shaft 4 forms an inclination angle with the horizontal plane, so that the slurry 15 is transferred from the screen plate 14 to the conveying belt under the action of the tangential force and the friction force, thereby realizing the automatic and efficient transfer of the slurry 15 from the screen plate 14 to the conveying belt; in addition, the surface of the conveying belt 2 is provided with uniformly distributed grooves, so that the slurry 15 can be stably attached to the surface of the conveying belt 2; the scraper strip 6 is arranged between the second roller shaft 4 and the third roller shaft 12, and can scrape the slurry 15 conveyed by the conveying belt 2 into the collecting device, so that the automatic and efficient collection and reliable recycling of the slurry 15 are realized through the arrangement of the overall structure.

[0033] It can be understood that the screen plate 14 disclosed in the embodiment is horizontally placed on the screen plate cleaning frame, and the slurry 15 will first be attached to the surface of the screen plate 14 due to its high viscosity and will not naturally drop.

[0034] In the embodiment, in order to ensure that the slurry 15 can be effectively transferred from the screen plate 14 to the belt, the friction coefficient between the belt and the screen plate 14 needs to be appropriately controlled, too large may damage the screen plate 14, too small is difficult to collect the slurry 15. The friction force can be controlled by adjusting the material or the texture of the surface of the belt, for example, the surface is provided with grooves on the surface of the belt, thereby enhancing the friction force, or selecting a material with appropriate surface tension to prepare the belt, thereby realizing the efficient collection and transfer of the slurry 15.

[0035] In the embodiment, the material of the conveying belt 2 includes polyurethane or silica gel. The advantages of selecting polyurethane or silica gel as the material of the conveying belt 2 are as follows: polyurethane or silica gel can provide a suitable surface friction coefficient and surface tension, and form a moderate contact force with the screen plate 14, so that the screen plate 14 is not damaged due to too large friction force, and the slurry 15 can be fully transferred; both the two materials have good elasticity and flexibility, so that the conveying belt 2 can be closely attached to the screen plate 14, and the transfer efficiency of the slurry 15 is improved; meanwhile, polyurethane and silica gel have excellent wear resistance, chemical resistance and aging resistance, can maintain stable physical and chemical properties for a long time, and the surface is easy to clean and will not remain the slurry 15. The person skilled in the art can also select a suitable material according to the actual needs, so that the slurry 15 can be effectively transferred from the screen plate 14 to the belt while the screen plate 14 is protected from damage.

[0036] Further, in the embodiment, the axis height of the third roller shaft 12 is less than the axis height of the second roller shaft 4.

[0037] In the embodiment, the height of the third roller 12 is set lower than the height of the second roller 4, that is, the height difference is set between the two rollers, so that the conveying belt 2 forms a turning point at the second roller 4, and the pulp 15 can naturally slide under the action of gravity when the conveying belt 2 moves to the highest point, and the pulp 15 can be more thoroughly scraped into the collecting device by the action of the scraper strip 6; at the same time, the vertically arranged structure can also prevent the pulp 15 from adhering to the surface of the conveying belt 2 and moving downward to cause waste, thereby improving the recovery efficiency of the pulp 15, and the vertically arranged structure makes the overall layout of the equipment more compact and occupies less space.

[0038] Preferably, the axis line of the second roller 4 and the third roller 12 is perpendicular to the horizontal plane.

[0039] In a specific embodiment, the scraper strip 6 is in a wedge-shaped structure with two sides narrowing, and the cross section of the scraper strip 6 is a right triangle, in which the side fixed with the support is the right angle side, and the side for guiding the pulp is the hypotenuse. The wedge-shaped design enables the scraper strip 6 to more effectively guide the pulp to the middle position and avoid the pulp spreading to both sides.

[0040] In another specific embodiment, the driving device is a motor 3 or other mechanical device capable of driving the conveying belt 2 to move, which is not specifically limited here.

[0041] In another specific embodiment, a support is arranged at the position of the axis of the second roller 4, and the support is perpendicular or acute to the axis line of the second roller 4 and the third roller 12. The collecting device is arranged on the support.

[0042] In another specific embodiment, the collecting device is a pulp box 7, and preferably, the top of the pulp box 7 is provided with a guide groove. One end of the guide groove corresponds to the scraper strip 6, and the other end extends obliquely to the inside of the pulp box 7, forming a smooth flow guide surface, so as to ensure that the pulp 15 scraped by the scraper strip 6 can reliably flow into the pulp box 7 along the guide groove. The pulp box 7 is detachably mounted on the support, so as to facilitate the pulp box 7 to be directly taken down for subsequent use after the collection of the pulp 15 is completed, thereby improving the practicability of the pulp 15 recovery. In addition, the volume of the pulp box 7 is designed according to the actual production demand, so as to ensure that a certain amount of pulp 15 of the screen can be recovered at a time.

[0043] In the embodiment, the conveying device further comprises a middle roller 9, and the middle roller 9 is located between the first roller 1 and the third roller 12.

[0044] In one embodiment, the axis of the middle roller 9 is located in the vertical plane in which the axes of the second roller 4 and the third roller 12 are located; the axis of the middle roller 9 is lower than the axis of the second roller 4 and higher than the axis of the third roller 12.

[0045] Further, in this embodiment, it also includes an auxiliary wheel 11 and an extension support 10, the auxiliary wheel 11 is connected to the axis of the middle roller 9 through the extension support 10.

[0046] In one embodiment, the extension support 10 includes a fixed frame and a sliding frame, one end of the fixed frame is fixedly connected to the middle roller 9, an arc-shaped adjusting slot is formed on the sliding frame, and the center of the arc-shaped adjusting slot coincides with the hinge point of the fixed frame and the sliding frame. By screwing the bolt through the arc-shaped adjusting slot and cooperating with the fixed frame, the inclination angle of the sliding frame relative to the fixed frame can be adjusted. When the desired angle is reached, tighten the bolt, and the sliding frame is fixed on the fixed frame by the compression force of the bolt and the washer.

[0047] It can be understood that in this embodiment, the purpose of setting the above-mentioned extension support 10 is to adjust the height of the roller. When the viscosity of the slurry 15 is high (poor flowability), the height of all rollers is increased by adjusting the extension support 10, and the inclination angle formed between the axis line of the first roller 1 and the second roller 4 and the horizontal plane is increased, so that a larger gravity component can be provided to help the slurry 15 slide down, prevent the slurry 15 from sticking on the surface of the conveyor belt 2, and ensure that the slurry 15 can flow smoothly into the collecting device.

[0048] On the contrary, when the viscosity of the slurry 15 is low (good flowability), the height of the auxiliary wheel 11 needs to be reduced, and the inclination angle formed between the axis line of the first roller 1 and the second roller 4 and the horizontal plane is reduced, so as to avoid the slurry 15 from splashing or flowing away due to too good flowability, and realize a more controllable slurry 15 collection process.

[0049] Preferably, the inclination angle formed between the axis line of the first roller 1 and the second roller 4 and the horizontal plane is 5°-15°. Those skilled in the art can select different inclination angles according to the viscosity of the slurry 15.

[0050] In addition, the belt rolling speed also needs to match the viscosity of the slurry 15. If the viscosity of the slurry 15 is high, the belt should roll slowly to ensure full recovery; if the slurry 15 is thin, the belt can roll faster to improve the recovery efficiency.

[0051] Further, in the embodiment, auxiliary wheels 11 are arranged on both sides of the screen plate 14 along a first direction, wherein the first direction is the extension direction of the line connecting the center roller 9 and the first roller 1. This arrangement makes the screen plate 14 stable under the support and guidance of the two auxiliary wheels 11. Specifically, the auxiliary wheels 11 abut against the sides of the screen plate 14 and play a role in guiding and limiting during the contact between the screen plate 14 and the conveyor belt 2, preventing the screen plate 14 from deviating or shaking during the recovery of the slurry 15. At the same time, the arrangement of the auxiliary wheels 11 also ensures that the conveyor belt 2 and the screen plate 14 maintain uniform contact pressure, avoiding incomplete recovery of the slurry 15 or damage to the screen plate 14 caused by uneven local stress.

[0052] Further, in the embodiment, a cleaning device is arranged on the outer surface of the conveyor belt 2 close to the center roller 9.

[0053] In the embodiment, the cleaning device cleans the conveyor belt 2 after the conveyor belt 2 continues to rotate through the center roller 9, which ensures the purity of the slurry 15 entering the slurry box 7 during the continuous recovery of the slurry 15.

[0054] In a specific embodiment, the cleaning device includes a cleaning brush 88 and a brush mounting bracket fixedly connected to the telescopic support 10, and the cleaning brush 88 is arranged on the brush mounting bracket and abuts against the outer surface of the conveyor belt 2 close to the center roller 9. The structure design that the cleaning brush 88 is fixedly connected to the telescopic support 10 through the brush mounting bracket not only ensures stable contact pressure with the conveyor belt 2, but also simplifies the adjustment and maintenance process, thereby improving the quality of the recovered slurry 15 and prolonging the service life of the conveyor belt 2.

[0055] In a specific slurry 15 collection process, when the above-mentioned screen slurry recovery device is used, the conveyor belt 2 arranged between the third roller 12 and the first roller 1 contacts and slightly presses the front end of the screen plate 14, and in the process of movement of the conveyor belt 2, the residual slurry 15 attached to the surface of the screen plate 14 is scraped up by the tangential force and friction force. The scraped slurry 15 is transferred to the surface of the conveyor belt 2 and moves to the position of the second roller 4 under the action of the friction force. When the slurry 15 moves with the conveyor belt 2 to the position of the second roller 4, it is guided by the two-sided narrowed scraper strips 6 and flows into the slurry box 7 under the action of gravity. Subsequently, the cleaning device at the negative pole of the center roller 9 cleans the conveyor belt 2, and the cleaned conveyor belt 2 continues to circulate, thereby realizing automatic and efficient collection and reliable recovery of the slurry 15.

[0056] Preferably, the embodiment is further provided with a handle connected with the shaft center of the second roller 4 through the support. The speed of the pushing is adjusted according to the recovery of the slurry 15, and the speed of the motor 3 can be adjusted to match the efficiency of the recovery of the slurry 15. The auxiliary wheels 11 can be kept stable and the stress of the operator can be reduced during the operation by being placed on both sides of the screen plate 14.

[0057] Various modifications and changes can be made to the present application without departing from the spirit and scope of the present application. Accordingly, it is intended that all such modifications and changes be included within the scope of the present application as long as the modified and changed embodiments fall within the scope of the claims of the present application and their equivalents.

Claims

1. A screen paste recovery device characterized by, The transmission device comprises a support, a first roller, a second roller and a third roller arranged at both ends of the support, and a conveyor belt arranged around the outer circumferential surface of the first roller, the second roller and the third roller. The outer surface of the conveyor belt is provided with a plurality of grooves uniformly distributed along the extension direction of the conveyor belt; the height of the axis of the second roller is higher than the height of the axis of the first roller; the axis connecting line between the first roller and the second roller and the horizontal plane forms an acute angle. A mesh plate is arranged between the first roller and the third roller for carrying slurry, and one end of the mesh plate is tangent to the lowest point of the first roller. A scraper strip is arranged on the outer surface of the conveyor belt between the second roller and the third roller, and the scraper strip is used for scraping the slurry into a collecting device. A driving device is arranged for driving the conveyor belt to move from the first roller to the third roller. The height of the axis of the second roller is higher than the height of the axis of the third roller.

2. The screen paste recovery apparatus of claim 1, wherein The inclination angle formed between the axis connecting line of the first roller and the second roller and the horizontal plane is 5°-15°.

3. The screen paste recovery apparatus of claim 1 wherein, The transmission device further comprises:

4. The screen paste recovery apparatus of claim 1 wherein, A middle roller is arranged between the first roller and the third roller. A telescopic support is connected to the axis of the middle roller. Further comprising:

5. The screen paste recovery apparatus of claim 4, wherein, A cleaning device is arranged on the outer surface of the conveyor belt close to the middle roller. Further comprising:

6. The screen paste recovery apparatus of claim 1 wherein, An auxiliary wheel is arranged on each side of the mesh plate along a first direction, wherein the first direction is the extension direction of the axis connecting line of the middle roller and the first roller. Further comprising:

7. The screen paste recovery apparatus of claim 1 wherein, A handle is connected to the axis of the second roller through the support. The scraper strip is fixed on the support between the second roller and the third roller.

8. The screen paste recovery apparatus of claim 1 wherein, The scraper strip has a wedge-shaped structure with narrowed sides.

9. The screen paste recovery apparatus of claim 1 wherein, The material of the conveyor belt comprises polyurethane or silica gel.

10. The screen paste recovery apparatus of claim 1 wherein, ​

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