Flexible pressing wheel

Abstract

The utility model relates to a flexible pinch roller which comprises an inner roller, a flexible sleeve is arranged on the periphery of the inner roller, the two ends of the flexible sleeve are connected with the inner roller in a sealing mode through sealing rings, liquid media are filled in the flexible sleeve, and the inner roller is a rigid solid round bar or a rigid pipe or comprises a solid round bar and a rigid pipe. The inner roller is made of metal, plastic or hard carbon fibers. The horizontal chain type wet process equipment can be in soft contact with the surface of the solar cell, so that the fragment rate of the solar cell in various horizontal chain type wet process equipment is greatly reduced. Furthermore, when the cathode roller is used in horizontal roller chain type electroplating equipment, the cathode roller can ensure that the cathode roller is in full contact with the upper surfaces of the solar cells with non-uniform thicknesses, so that the lower surfaces of the solar cells are in good conductive contact with the cathode roller.

Description

Technical Field

[0001] The utility model belongs to the field of photovoltaic technology and relates to a flexible pressure wheel. Background Art

[0002] Horizontal roller chain wet process equipment plays an important role in the production of solar cells. For example, back etching equipment and horizontal electroplating equipment in the production of solar cells are both horizontal roller chain wet process equipment.

[0003] Specifically, in the horizontal roller chain wet process equipment, there are generally steps of cleaning the surface of silicon wafers and solar cells with deionized water and drying the surface of silicon wafers and solar cells. In order to prevent the silicon wafers and solar cells from irregularly jumping due to uneven water pressure and air flow disturbance, thereby increasing the risk of silicon wafers and solar cells being broken, an upper pressing wheel is generally used to fix the silicon wafers and solar cells.

[0004] Furthermore, in the horizontal chain electroplating equipment, an upper pressure roller is required to press the solar cell onto the cathode roller. Because in the horizontal chain electroplating equipment, since all rollers, cathode rollers and insulating rollers, cannot be completely kept in a straight line, there is a risk that the lower surface of the solar cell will not contact the cathode roller during the transmission process of these rollers. When the lower surface of the solar cell does not contact the cathode roller, the electroplating process on the surface of the solar cell stops. In order to solve the above problems, an upper pressure roller is generally placed on the cathode roller, the purpose of which is to press the solar cell onto the cathode roller.

[0005] At present, the upper pressing wheels used in all wet process equipment are rigid rollers. As the thickness of silicon wafers and solar cells continues to decrease, the risk of silicon wafer and solar cell fragments caused by rigid rollers is increasing. Furthermore, for horizontal chain electroplating equipment, since the thickness of the two sides of the solar cell is not equal, if the solar cell is clamped between the rigid upper roller and the lower roller, the solar cell clamped between the upper and lower rollers cannot be tightly attached to the outer diameter surface of the cathode roller, which results in the solar cell being unable to have good conductive contact with the cathode roller. Summary of the invention

[0006] The purpose of the utility model is to provide a flexible pressure wheel which can solve the above-mentioned problems.

[0007] According to the technical solution provided by the invention: a flexible pressure wheel, the flexible pressure wheel includes an inner roller, a flexible sleeve is provided on the outer periphery of the inner roller, both ends of the flexible sleeve are sealed and connected to the inner roller through sealing rings, and the flexible sleeve is filled with liquid medium.

[0008] As a further improvement of the utility model, the inner roller is a rigid solid round rod or a rigid tube, or includes a solid round rod and a rigid tube.

[0009] As a further improvement of the present invention, the inner roller material includes metal, plastic or hard carbon fiber.

[0010] As a further improvement of the utility model, the flexible sleeve adopts a single-layer flexible sleeve, and both ends of the single-layer flexible sleeve are sealing rings.

[0011] As a further improvement of the present invention, the material of the flexible sleeve includes flexible plastic, or flexible rubber, or other flexible materials.

[0012] As a further improvement of the present invention, the sealing ring includes metal or non-metal.

[0013] As a further improvement of the utility model, a protective sleeve is provided between the inner roller and the flexible sleeve, and the material of the protective sleeve includes metal or non-metal.

[0014] As a further improvement of the utility model, a spacer ring is provided between the sealing rings at both ends of the inner roller.

[0015] As a further improvement of the present invention, the liquid medium includes water or other liquid compounds.

[0016] A method for using a flexible pressing wheel, wherein any of the above-mentioned flexible pressing wheels is pressed onto a silicon wafer or a solar cell wafer.

[0017] The positive effects of this application are:

[0018] The utility model can softly contact the surface of the solar cell, thereby greatly reducing the fragmentation rate of the solar cell in various horizontal chain wet process equipment. Furthermore, the utility model is used in the horizontal roller chain electroplating equipment to ensure full contact with the upper surface of the solar cell with uneven thickness, so that the lower surface of the solar cell has good conductive contact with the cathode roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model.

[0020] Figure 2a-2 It is a schematic diagram of the sag generated by the flexible sleeve in the utility model.

[0021] Figure 3 It is a schematic diagram of the structure in which the inner roller sleeve is provided with a protective sleeve in the utility model.

[0022] Figure 4 It is a schematic diagram of the structure in which the inner roller is sleeved with a spacer ring in the utility model.

[0023] Figure 5a-Figure 5 It is a structural schematic diagram of the first embodiment of the method for using the flexible pressure wheel of the utility model.

[0024] Figure 6 It is a structural schematic diagram of the second embodiment of the method for using the flexible pressure wheel of the utility model.

[0025] Figure 7-Figure 9 It is a structural schematic diagram of the third embodiment of the method for using the flexible pressure wheel of the utility model. Specific embodiments

[0026] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] In order to enable those skilled in the art to better understand the solution of the utility model, the following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0028] It should be noted that the terms "second", "secondary", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to describe the embodiments of the utility model described herein. In addition, similar terms such as "including" and "having" mean that in addition to those contents already listed in "including" and "having", other contents that have not been listed may also be "included" and "having"; for example, a process, method, system, product or device that may include a series of steps or units is not necessarily limited to those steps or units that have been clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0029] Due to the angle of the drawing, some components may not be drawn, but their positions and connection relationships can be partially understood based on the text expression.

[0030] like Figure 1 As shown, the utility model is a flexible pressure wheel, and the flexible pressure wheel of the utility model comprises an inner roller 1, a flexible sleeve 2, a sealing ring 3, and a liquid medium 4.

[0031] The inner roller 1 is a rigid solid round rod or a rigid tube, or includes a solid round rod and a rigid tube. The inner roller 1 material includes metal, plastic or hard carbon fiber.

[0032] There are sealing rings 3 at both ends of the inner roller 1. The function of the sealing rings 3 is to seal the liquid medium 4 between the inner roller 1 and the flexible sleeve 2.

[0033] The flexible sleeve 2 is an engineering plastic or rubber with a certain elasticity, and will have a certain sag under the gravity of the liquid medium 4, that is, it will sag downward under the gravity of the liquid medium in the flexible sleeve 2, resulting in deformation, such as Figure 2a-2 shown.

[0034] like Figure 3 As shown, in order to prevent the liquid medium 4 from corroding the inner roller 1, or if there are other special needs, a protective sleeve 5 can be provided outside the inner roller 1.

[0035] like Figure 4 As shown, in other applications of the flexible pressure wheel, a plurality of spacer rings 16 can be placed between the sealing rings 3 at both ends of the flexible pressure wheel, and the droop of the flexible pressure wheel can be adjusted by changing the diameter of the spacer rings 16.

[0036] The liquid medium 4 can be water or other liquids.

[0037] The following embodiment specifically illustrates a method for using a flexible pressure wheel.

[0038] Embodiment 1, as Figure 5a-Figure 5 As shown, the silicon wafer or solar cell 6 is horizontally transferred between the lower roller 7 and the flexible pressure wheel.

[0039] Reference Figure 5 The flexible pressure wheel of the utility model is mainly composed of a flexible sleeve 2, an inner roller 1 and a liquid medium 4; the flexible sleeve 2 is a flexible single-layer structure. The inner roller 1 of the utility model can be in various forms, for example, it can be a rigid solid rod, or a rigid tube. The inner roller 1 of the utility model can be made of various rigid materials, such as plastic, metal and carbon fiber.

[0040] Outside the inner roller 1, there can be a liquid medium 4 directly, such as Figure 1 , Figure 2 ,and Figure 5 In some applications of the present invention, a protective sleeve 5 is additionally provided outside the inner roller 1, such as Figure 3 The protective sleeve 5 can be used to reduce the surface tension in contact with the liquid 3, or to protect the inner roller 1 from corrosion, or for other special purposes.

[0041] The liquid medium 4 of the utility model can be any liquid according to different applications. For example, in general applications, it can be water. If the wet process has a strict requirement that it cannot be contaminated, the liquid is the same as the liquid used in the wet process. Further, if the flexible pressure wheel of the utility model needs to have a greater downward force, a liquid with a larger specific gravity can be selected.

[0042] The outermost layer of the flexible pressure wheel of the utility model is a flexible sleeve 2. The material of the flexible sleeve 2 can be flexible plastic and flexible rubber, or other materials that can sag under the action of the liquid medium 4 of the utility model (such as Figure 2a-2 any material shown).

[0043] like Figure 4 As shown, the droop of the flexible pressure wheel of the present invention can be controlled by changing the diameter of the spacer ring 16.

[0044] In this embodiment, the silicon wafer or solar cell 6 is transferred from left to right between the lower roller 7 and the flexible pressure wheel. Figure 5a As shown, since the flexible pressing wheel of the utility model has the characteristic of sinking downward, the contact area of ​​the flexible pressing wheel contacting the silicon wafer or solar cell 6 is optimized from a straight line of the rigid roller to a plane 9. The increase in the contact surface with the silicon wafer or solar cell 6 not only improves the stability of the silicon wafer or solar cell 6 during the transmission process, but more importantly, since the silicon wafer or solar cell 6 contacts the flexible material, the risk of the silicon wafer or solar cell 6 being broken can be greatly reduced.

[0045] Further, if Figure 5a-Figure 5 As shown, while the silicon wafer or solar cell 6 is being transported from left to right by the lower roller 7 and the flexible pressure wheel, its upper and lower surfaces are treated by various media 8. For example, if the medium 8 is a chemical liquid, the silicon wafer or solar cell 6 is chemically treated, if the medium 8 is water, the silicon wafer or solar cell 6 is washed with water, and further, if the other medium 8 is a gas, such as compressed air or nitrogen, the surface of the silicon wafer or solar cell 6 is dried.

[0046] The flexible pressing wheel of the utility model is installed above the silicon wafer or solar cell 6 and contacts the upper surface of the silicon wafer or solar cell 6. Figure 5a-Figure 5 As shown, the flexible pressure wheel of the utility model can be installed above the lower roller 7. In some other applications, as long as it is ensured that the flexible pressure wheel of the utility model contacts the upper surface of the silicon wafer or solar cell 6, it can be installed in other positions.

[0047] Embodiment 2, as Figure 6 shown.

[0048] In this embodiment, the function of the flexible pressing wheel of the utility model is to remove a portion of the liquid on the surface of the silicon wafer or solar cell 6. In some processes of wet processing, in order to reduce the use of chemical substances or reduce the discharge of wastewater, a step is often required to remove a portion of the liquid on the surface of the silicon wafer or solar cell 6. The flexible pressing wheel of the utility model has a particularly good effect in removing a portion of the liquid on the surface of the silicon wafer or solar cell 6.

[0049] like Figure 6 As shown, the upper surface of the silicon wafer or solar cell 6 has a thick layer of liquid 10 before entering the flexible pressing wheel of the utility model. However, after passing through the flexible pressing wheel of the utility model, most of the liquid 10 is squeezed out of the upper surface of the silicon wafer or solar cell 6 by the flexible pressing wheel of the utility model.

[0050] Embodiment 3, as Figure 7 As shown, during use, the flexible pressure wheel is pressed on the cathode roller 13, and the solar cell 6 is clamped between the flexible pressure wheel and the cathode roller 13. Outside the cathode roller 13 is the cathode groove 11, and the outer periphery of the cathode groove 11 is the electroplating solution 12. The function of the cathode groove 11 is to ensure that the cathode roller 13 is not immersed in the electroplating solution 12.

[0051] Usually, the thickness of the solar cell 6 is about 0.1 mm. Due to the wear of the cutting line during the slicing process, one side of the solar cell 6 is about 0.02 mm thicker than the other side. Therefore, if the upper roller 14 is also rigid, there will be a fine gap between the solar cell 6 between the upper roller 14 and the cathode roller 13, and between the upper roller 14 and the cathode roller 13. Figure 8 As shown. Due to the softness of the flexible pressure wheel of the utility model, Fig. 9 As shown, it is possible to fully contact the upper surface of the solar cell 6 with uneven thickness, and the lower surface of the solar cell 6 can also fully contact the outer end of the cathode roller 13, ensuring that the entire surface of the solar cell 6 can contact the upper soft pressure wheel 14 and the lower cathode roller 13 at the same time. In this way, the contact area between the solar cell 6 and the lower cathode roller 13 is increased, so that the lower surface of the solar cell 6 has good conductive contact with the cathode roller 13.

[0052] It is understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A flexible pressure wheel, characterized in that: The flexible pressure wheel comprises an inner roller (1), a flexible sleeve (2) is provided on the outer periphery of the inner roller (1), both ends of the flexible sleeve (2) are sealedly connected to the inner roller (1) via sealing rings (3), and the flexible sleeve (2) is filled with a liquid medium (4).

2. The flexible pressure wheel according to claim 1, characterized in that: The inner roller (1) is a rigid solid round rod or a rigid tube, or includes a solid round rod and a rigid tube.

3. The flexible pressure wheel according to claim 1, characterized in that: The material of the inner roller (1) includes metal, plastic or hard carbon fiber.

4. The flexible pressure wheel according to claim 1, characterized in that: The flexible sleeve (2) adopts a single-layer flexible sleeve (2), and both ends of the single-layer flexible sleeve (2) are provided with sealing rings (3).

5. The flexible pressure wheel according to claim 4, characterized in that: The material of the flexible sleeve (2) includes flexible plastic or flexible rubber.

6. The flexible pressure wheel according to claim 1, characterized in that: The sealing ring (3) comprises metal or non-metal.

7. The flexible pressure wheel according to claim 1, characterized in that: A protective sleeve (5) is provided between the inner roller (1) and the flexible sleeve (2). The material of the protective sleeve (5) includes metal or non-metal.

8. The flexible pressure wheel according to claim 1, characterized in that: A spacer ring (16) is provided between the sealing rings (3) at both ends of the inner roller (1).

9. The flexible pressure wheel according to claim 1, characterized in that: The liquid medium (4) includes water or a liquid compound.

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