Novel chain type roller fragment structure

Abstract

The utility model relates to the technical field of crystalline silicon cell production and manufacturing, in particular to a novel chain type roller fragment structure which comprises a pressing rod and a connecting rod. A plurality of groups of connecting rods are mounted at the outer ends of the plurality of groups of pressing rods, the outer wall of one group of connecting rods is sleeved with an anti-pinch wheel, and cold air knives are mounted on the outer sides of the plurality of groups of pressing rods and the outer sides of the connecting rods. According to the utility model, the anti-pinch roller is used for supporting, the use of a water-driving roller is reduced, the direct contact area between the silicon wafer and the compression bar roller is reduced, the friction force and extrusion gravity generated by contact are reduced, the risk that the silicon wafer is broken due to external force in the transmission process is effectively reduced, and the surface quality of the silicon wafer is improved; production interruption and extra cleaning work caused by fragments are reduced; and the next roller in the rollers is changed into a cold air knife, nitrogen blowing is used for replacing mechanical extrusion water driving, high-speed and low-temperature airflow is provided, moisture on the surface of the silicon wafer can be quickly dried, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of crystalline silicon battery manufacturing technology, and in particular to a novel chain roller fragment structure. Background Technology

[0002] Crystalline silicon solar cells are devices that convert solar energy into electrical energy using the photovoltaic effect. Based on the crystalline form of silicon, silicon solar cells can be classified into monocrystalline silicon solar cells, polycrystalline silicon solar cells, and amorphous silicon solar cells. During the silicon cell production process, HF liquid in the etching tank etches the lower surface and edges of the diffused silicon wafer to remove N-type silicon at the edges, breaking short-circuit pathways on the wafer surface. After passing through the acidic tank, the silicon wafer needs to be cleaned and dried in a water tank and a drying tank before proceeding to the next process. Within the etching machine, the silicon wafer is mainly transported via rollers. During passage through the water tank and drying tank, the silicon wafer needs to be fixed vertically to prevent drifting or flying; pressure rods on the rollers are used to secure the wafer.

[0003] The existing water-driving rollers and pressure rollers generate significant friction and pressure when in contact with silicon wafers during production. This can easily cause microcracks and breakage of the silicon wafers, resulting in material fragments. Consequently, the breakage rate and material failure rate of the machine increase, reducing the overall production quality. Utility Model Content

[0004] To overcome the problems of existing water-driving rollers and upper pressure rollers, which generate large friction and pressure forces when in contact with silicon wafers during production, easily causing microcracks and breakage of silicon wafers, resulting in increased machine breakage rate and material failure rate, and reducing overall production quality, this utility model provides a novel chain roller fragmentation structure.

[0005] The technical solution is as follows: A novel chain roller fragment structure includes pressure rods and connecting rods; multiple sets of pressure rods are provided, and several sets of connecting rods are installed on the outer ends of the multiple sets of pressure rods. One set of connecting rods is fitted with an anti-pressure wheel on its outer wall, and cold air knives are installed on the outer sides of the multiple sets of pressure rods and connecting rods.

[0006] Furthermore, the anti-pressure roller is fixedly connected to the connecting rod, and connecting blocks are fixed at both ends of the connecting rod.

[0007] Furthermore, each connecting block has a connecting rod fixed at one end, and the two ends of the pressure rod are provided with connecting grooves to accommodate the connecting rods. The connecting rod is spliced ​​with the pressure rod through the connecting rod.

[0008] Furthermore, the two ends of the multiple pressure rods are fixed with connectors on the outside of the mating groove, and the outer end of the connecting block is circumferentially installed with multiple sets of locking pins. The inside of the connector is provided with a movable groove to accommodate the locking pins.

[0009] Furthermore, rollers are symmetrically installed on the outer ends of multiple sets of pressure rollers, and the rollers are fixedly connected to the pressure rollers.

[0010] Furthermore, two sets of connecting pipes are installed at the upper end of the cold air knife, and the two sets of connecting pipes are internally connected by a transmission pipe.

[0011] Furthermore, a rubber joint is fixed to the end of the transmission pipe away from the connecting pipe, and the rubber joint is connected to the transmission pipe.

[0012] Furthermore, one end of the connecting rod at both ends is fixed with a connecting rod, and a gear is provided on the outer side of one set of connecting rods, with the gear fixedly connected to the connecting rod.

[0013] The beneficial effects are as follows: This utility model achieves the reduction of the use of water-removing rollers by adopting anti-pressure rollers for support, thereby reducing the direct contact area between the silicon wafer and the pressure rollers, reducing the friction and pressure caused by contact, effectively reducing the risk of silicon wafer breakage due to external forces during transportation, reducing the breakage rate, improving the surface quality of silicon wafers, and reducing production interruptions and additional cleaning work caused by breakage; in addition, by replacing the last roller in the rollers with a cold air knife, nitrogen blowing replaces mechanical squeezing to remove water, providing high-speed, low-temperature airflow, which can quickly dry the moisture on the surface of the silicon wafer, shortening the drying time and improving production efficiency. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of a novel chain roller fragment structure according to the present invention;

[0015] Figure 2 This is a schematic diagram of the three-dimensional structure of the gear of this utility model;

[0016] Figure 3 This is a three-dimensional structural diagram of the pressure bar of this utility model;

[0017] Figure 4 This is a three-dimensional structural diagram of the connecting rod of this utility model;

[0018] Figure 5 This is a three-dimensional structural diagram of the cold air knife of this utility model.

[0019] In the attached diagram, the following are the reference numerals: 1. Pressure rod; 2. Connecting rod; 3. Anti-pressure roller; 4. Roller; 5. Connecting joint; 6. Connecting block; 7. Connecting rod; 8. Locking pin; 9. Cold air knife; 10. Transmission pipe; 11. Connecting rod; 12. Gear. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0021] A crystalline silicon solar cell is a semiconductor device that converts solar energy into electrical energy. It primarily uses crystalline silicon as its base material. Crystalline silicon possesses excellent photoelectric properties, absorbing photon energy from sunlight, causing electrons to transition from the valence band to the conduction band, thus generating photogenerated carriers, namely electrons and holes. Through the internal structure of the cell, such as a PN junction or PIN junction, these photogenerated carriers are separated and collected, forming an output current.

[0022] Structurally, crystalline silicon solar cells typically consist of a front electrode, a back electrode, a crystalline silicon substrate, and an anti-reflective coating. The front electrode is generally a pattern of fine grid lines and main grid lines, used to collect current and transmit it to an external circuit. The back electrode serves to collect current and provide electrical contact. The crystalline silicon substrate is the core component of the cell and can be monocrystalline or polycrystalline silicon. Monocrystalline silicon has a complete crystal structure and regular atomic arrangement, resulting in high photoelectric conversion efficiency, but its production cost is relatively high. Polycrystalline silicon is composed of many small crystals, making its production process relatively simple and its cost lower, although its photoelectric conversion efficiency is slightly lower than that of monocrystalline silicon. The anti-reflective coating reduces the reflection loss of sunlight on the cell surface and improves light absorption; common anti-reflective coating materials include silicon nitride.

[0023] The manufacturing process of crystalline silicon solar cells involves a series of complex steps. First, the silicon wafer is cleaned and texturized to remove surface impurities and damaged layers, creating a textured structure that increases light absorption. Next, a diffusion process is performed to form a PN junction on the silicon wafer surface, a crucial structure for the cell to generate current. Following this is etching and dephosphosilicate glass removal to remove the PN junction at the edges and the surface impurity layer. Then, an anti-reflective coating is deposited to improve light absorption efficiency. Finally, screen printing and sintering processes are used to form the electrodes and ensure good ohmic contact between them and the silicon wafer.

[0024] Crystalline silicon solar cells offer numerous advantages. They boast a long lifespan, capable of stable operation for over 25 years under normal conditions. They exhibit high photoelectric conversion efficiency; the highest laboratory conversion efficiency for monocrystalline silicon solar cells has exceeded 27%, and the efficiency of polycrystalline silicon solar cells continues to improve. Furthermore, crystalline silicon is an abundant resource, environmentally friendly, and aligns with sustainable development requirements. Therefore, crystalline silicon solar cells are widely used in various fields, including ground-mounted photovoltaic power stations, distributed photovoltaic power generation systems, solar streetlights, and solar chargers, making significant contributions to global energy supply and environmental protection.

[0025] In the wet etching process of crystalline silicon solar cell production, the rollers in the chain conveyor are key components for conveying and handling silicon wafers. These rollers are typically arranged in groups, consisting of upper and lower rollers, horizontally, with the silicon wafers being conveyed between them. The main function of the rollers is to ensure that the silicon wafers pass smoothly and accurately through each processing tank during wet etching, while minimizing damage and contamination during transport. Specifically, a certain gap is usually set between the upper and lower rollers. This design avoids direct contact between the rollers and the silicon wafers, thus reducing roller marks and high breakage rates. The upper rollers, through capillary action and liquid surface tension, suspend the etching solution at the lower edge of the roller, using droplets on the rollers to press the silicon wafers in place. The lower rollers, with appropriately increased roughness, use friction to smoothly advance the silicon wafers. This non-contact roller system effectively reduces damage to the silicon wafers during transport, improving production efficiency and product quality.

[0026] Furthermore, the rollers are typically designed with grooves on their surface to carry the etching solution, ensuring full contact between the silicon wafer surface and the solution for optimal etching results. In some cases, roller runout is strictly controlled, for example, within 0.1 mm, to ensure stable and precise transport. This design not only improves the transport stability of the silicon wafers but also reduces wafer damage caused by roller runout. The rollers in the chain-driven machine play a crucial role in the wet etching process of crystalline silicon solar cells; through proper design and optimization, production efficiency and product quality can be significantly improved.

[0027] like Figures 1-5 As shown, a novel chain roller 4 fragment structure includes a pressure rod 1 and a connecting rod 2; the pressure rod 1 is provided in multiple sets, and several sets of connecting rods 2 are installed on the outer ends of the multiple sets of pressure rods 1. One set of connecting rods 2 is fitted with an anti-pressure wheel 3 on its outer wall. Cold air blades 9 are installed on the outer sides of the multiple sets of pressure rods 1 and connecting rods 2. The anti-pressure wheel 3 is fixedly connected to the connecting rod 2, and connecting blocks 6 are fixed at both ends of the connecting rod 2.

[0028] Please see Figures 2-4 One end of each connecting block 6 is fixed with a connecting rod 7. Both ends of the pressure rod 1 are provided with connecting grooves to accommodate the connecting rod 7. The connecting rod 2 is spliced ​​with the pressure rod 1 through the connecting rod 7. Both ends of the multiple pressure rods 1 are fixed with joints 5 on the outside of the connecting groove. Multiple sets of locking pins 8 are circumferentially installed on the outer end of the connecting block 6. The inside of the joint 5 is provided with a movable groove to accommodate the locking pins 8. Rollers 4 are symmetrically installed on the outer ends of the multiple pressure rollers. The rollers 4 are fixedly connected to the pressure rollers.

[0029] Please see Figures 3-5Two sets of connecting pipes are installed on the upper end of the cold air knife 9. The two sets of connecting pipes are connected internally by a transmission pipe 10. A rubber joint is fixed at the end of the transmission pipe 10 away from the connecting pipe. The rubber joint is connected to the transmission pipe 10. One end of the connecting rod 2 at both ends is fixed with a connecting rod 11. A gear 12 is provided on the outside of one set of connecting rods 2. The gear 12 is fixedly connected to the connecting rod 11.

[0030] When producing crystalline silicon solar cells, the pressure roller 3 is first installed on the outer wall of the connecting rod 2. A fixed connection ensures stability, allowing the pressure roller 3 to evenly distribute the weight of the silicon wafer during subsequent processing. This prevents excessive pressure on localized areas, reducing the risk of microcracks and breakage. After the pressure roller 3 is installed, the connecting rod 2 is quickly spliced ​​with the pressure rod 1 via the docking rod 7, facilitating maintenance and replacement. After the connecting rod 2 and pressure rod 1 are spliced, the pressure rod 1 is placed inside the equipment, and gear 12 engages with the equipment to achieve synchronous movement of the entire chain roller 4 system, ensuring smooth silicon wafer transport. Next, a nitrogen supply system is connected via the transmission pipe 10 and a rubber joint. Using a cold air knife 9, nitrogen is blown to quickly and evenly dry the moisture on the silicon wafer surface, avoiding damage caused by mechanical squeezing to remove water. Furthermore, the low-temperature properties of nitrogen prevent thermal stress caused by high-temperature drying on the silicon wafer surface, ensuring surface quality.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A novel chain roller fragment structure, characterized in that, It includes pressure rods (1) and connecting rods (2); the pressure rods (1) are provided in multiple sets, and several sets of connecting rods (2) are installed on the outer ends of the multiple sets of pressure rods (1). One set of connecting rods (2) is fitted with anti-pressure wheels (3) on its outer wall, and cold air knives (9) are installed on the outer sides of the multiple sets of pressure rods (1) and connecting rods (2).

2. The novel chain roller fragment structure according to claim 1, characterized in that, The anti-pressure wheel (3) is fixedly connected to the connecting rod (2), and both ends of the connecting rod (2) are fixed with connecting blocks (6).

3. The novel chain roller fragment structure according to claim 1, characterized in that, One end of each connecting block (6) is fixed with a connecting rod (7), and both ends of the pressure rod (1) are provided with connecting grooves to accommodate the connecting rod (7). The connecting rod (2) is spliced ​​with the pressure rod (1) through the connecting rod (7).

4. The novel chain roller fragment structure according to claim 3, characterized in that, The two ends of the multiple pressure rods (1) are fixed with joints (5) on the outside of the docking groove. The outer end of the connecting block (6) is circumferentially installed with multiple sets of locking pins (8). The inside of the joint (5) is provided with a movable groove to accommodate the locking pins (8).

5. A novel chain roller fragment structure according to claim 4, characterized in that, Rollers (4) are symmetrically installed on the outer ends of multiple pressure rollers, and the rollers (4) are fixedly connected to the pressure rollers.

6. The novel chain roller fragment structure according to claim 1, characterized in that, The upper end of the cold air knife (9) is equipped with two sets of connecting pipes, and the two sets of connecting pipes are connected by a transmission pipe (10).

7. A novel chain roller fragment structure according to claim 6, characterized in that, A rubber joint is fixed at the end of the transmission pipe (10) away from the connecting pipe, and the rubber joint is connected to the transmission pipe (10).

8. A novel chain roller fragment structure according to claim 3, characterized in that, One end of the connecting rod (2) at both ends is fixed with a connecting rod (11), and a gear (12) is provided on the outer side of one set of connecting rods (2), and the gear (12) is fixedly connected to the connecting rod (11).

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