US-12623245-B2 - Chain-type roller coating apparatus and use thereof

US12623245B2US 12623245 B2US12623245 B2US 12623245B2US-12623245-B2

Abstract

The present application provides a chain-type roller coating apparatus, including a liquid coating roller and a synchronizing wheel. The synchronizing wheel is provided with a mounting hole. A proximity switch is arranged on an outer side of the synchronizing wheel. The synchronizing wheel is further provided with a trigger element which is configured to be sensed by the proximity switch. The liquid coating roller is assembled with the mounting hole of the synchronizing wheel by a connecting shaft. A shaft main body of the connecting shaft is equipped with a rotation support device configured to support a rotation of the shaft main body. The rotation support device is equipped with a first lifting driving device configured to drive the rotation support device to ascend or descend vertically. A ranging sensor is arranged exactly above the liquid coating roller.

Inventors

Changrui Ren
Min Wang
Hao Pan
Yun Zhang

Assignees

Changzhou Shichuang Energy Co., Ltd

Dates

Publication Date: 20260512
Application Date: 20210914
Priority Date: 20210319

Claims (18)

1 . A chain-type roller coating apparatus, comprising a roller bed configured to convey a silicon wafer and a liquid coating roller horizontally arranged and configured for roller-coating a dopant source onto the silicon wafer on the roller bed, wherein the roller bed comprises a plurality of conveying rollers arranged sequentially along a conveying direction of the roller bed and a transmission mechanism configured to drive the plurality of conveying rollers to rotate; the plurality of conveying rollers are horizontally arranged and parallel to each other; the liquid coating roller is parallel to the plurality of conveying rollers; the liquid coating roller is equipped with a synchronizing wheel configured to drive the liquid coating roller to rotate, the synchronizing wheel is located on an outer side of an axial end of the liquid coating roller, an axis of the synchronizing wheel is parallel to an axis of the liquid coating roller, and the axis of the synchronizing wheel and the axis of the liquid coating roller are located in an identical vertical plane; the synchronizing wheel is equipped with a driving mechanism configured to drive the synchronizing wheel to rotate; the synchronizing wheel is further provided with a mounting hole, the mounting hole is a straight elongated hole, the mounting hole extends along a radial direction of the synchronizing wheel, and the mounting hole extends across the axis of the synchronizing wheel; a proximity switch is further arranged on an outer side of the synchronizing wheel, and the proximity switch and the axis of the synchronizing wheel are located in an identical vertical plane; the synchronizing wheel is further provided with a trigger element which is configured to be sensed by the proximity switch, the trigger element is located outside the mounting hole, and the trigger element and the mounting hole are located on an identical straight line; the trigger element is configured to rotate with the synchronizing wheel, and when the trigger element is rotated to a position in which the trigger element is sensed by the proximity switch, the trigger element and the axis of the synchronizing wheel are located in an identical vertical plane; the liquid coating roller is assembled with the synchronizing wheel by a connecting shaft; the connecting shaft comprises a shaft main body which is connected to the liquid coating roller and coaxial with the liquid coating roller, and a shaft protrusion portion which extends from an end of the shaft main body away from the liquid coating roller and is inserted into the mounting hole; the shaft protrusion portion is slidably engaged with the mounting hole; the shaft main body of the connecting shaft is equipped with a rotation support device configured to support a rotation of the shaft main body, and the rotation support device is located between the liquid coating roller and the synchronizing wheel; the rotation support device is equipped with a first lifting driving device configured to drive the rotation support device to ascend or descend vertically; and a ranging sensor is arranged exactly above the liquid coating roller.
2 . The chain-type roller coating apparatus according to claim 1 , wherein the synchronizing wheel, the proximity switch, the first lifting driving device, and the ranging sensor are supported by a frame.
3 . The chain-type roller coating apparatus according to claim 2 , wherein the liquid coating roller is equipped with a feeding mechanism configured to supply the dopant source to the liquid coating roller; the feeding mechanism comprises a liquid reservoir configured to store a liquid dopant source, and a liquid taking roller and a liquid squeezing roller which are configured to transfer the liquid dopant source in the liquid reservoir to the liquid coating roller, and the liquid reservoir, the liquid taking roller, and the liquid squeezing roller are supported by the frame; the liquid taking roller and the liquid squeezing roller are horizontally arranged and parallel to the plurality of conveying rollers; a lower portion of the liquid taking roller is immersed in the liquid reservoir, and an upper portion of the liquid taking roller is located above the liquid reservoir; the liquid coating roller is located on an outer side of the liquid reservoir; and the liquid squeezing roller is located between the liquid taking roller and the liquid coating roller, and two sides of a bottom portion of the liquid squeezing roller are respectively in contact with the liquid taking roller and the liquid coating roller.
4 . The chain-type roller coating apparatus according to claim 3 , wherein the frame is equipped with a second lifting driving device configured to drive the frame to ascend or descend vertically.
5 . The chain-type roller coating apparatus according to claim 1 , wherein the mounting hole is a rectangular hole, and the shaft protrusion portion is in a shape of a rectangular bar.
6 . The chain-type roller coating apparatus according to claim 1 , wherein the shaft protrusion portion is coaxial with the shaft main body.
7 . The chain-type roller coating apparatus according to claim 1 , wherein the rotation support device comprises a bearing sleeved over the shaft main body and a connecting member connected to the bearing and the first lifting driving device.
8 . The chain-type roller coating apparatus according to claim 1 , wherein the first lifting driving device is a linear motor or a linear cylinder.
9 . The chain-type roller coating apparatus according to claim 1 , wherein the trigger element is arranged on an outer end surface of the synchronizing wheel.
10 . The chain-type roller coating apparatus according to claim 1 , wherein the proximity switch is located above the synchronizing wheel, and the trigger element extends to a periphery of the synchronizing wheel.
11 . An use of the chain-type roller coating apparatus according to claim 1 , wherein the chain-type roller coating apparatus is applied to a chain-type diffusion process, a chain-type gettering process, or a laser-doped selective emitter (SE) process.
12 . The chain-type roller coating apparatus according to claim 4 , wherein the mounting hole is a rectangular hole, and the shaft protrusion portion is in a shape of a rectangular bar.
13 . The chain-type roller coating apparatus according to claim 4 , wherein the shaft protrusion portion is coaxial with the shaft main body.
14 . The chain-type roller coating apparatus according to claim 4 , wherein the rotation support device comprises a bearing sleeved over the shaft main body and a connecting member connected to the bearing and the first lifting driving device.
15 . The chain-type roller coating apparatus according to claim 4 , wherein the first lifting driving device is a linear motor or a linear cylinder.
16 . The chain-type roller coating apparatus according to claim 4 , wherein the trigger element is arranged on an outer end surface of the synchronizing wheel.
17 . The chain-type roller coating apparatus according to claim 4 , wherein the proximity switch is located above the synchronizing wheel, and the trigger element extends to a periphery of the synchronizing wheel.
18 . An use of the chain-type roller coating apparatus according to claim 16 , wherein the chain-type roller coating apparatus is applied to a chain-type diffusion process, a chain-type gettering process, or a laser-doped selective emitter (SE) process.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application is a 371 of international application of PCT application serial no. PCT/CN2021/118305, filed on Sep. 14, 2021, which claims the priority benefit of China application serial no. 202110296523.5, filed on Mar. 19, 2021. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification. BACKGROUND Technical Field The present disclosure relates to the photovoltaic field, and specifically to a chain-type roller coating apparatus and use thereof. Description of Related Art In the production process of solar cells, silicon wafers need to be subjected to dopant diffusion treatment. Dopant diffusion can be divided into two steps: source deposition and source drive-in. The source deposition is to deposit a dopant source on a surface of a silicon wafer. The source drive-in is to perform heat treatment on the silicon wafer with the dopant source deposited, so that dopant elements diffuse into the silicon wafer. A liquid dopant source may be used in the source deposition. The liquid dopant source is uniformly roller-coated on the surface of the silicon wafer by using a liquid coating roller. To supply the liquid dopant source to the liquid coating roller, a liquid squeezing roller, a liquid taking roller, and a liquid reservoir need to be arranged for the liquid coating roller. The liquid reservoir stores the liquid dopant source. A lower portion of the liquid taking roller is immersed in the liquid reservoir, and an upper portion of the liquid taking roller is located above the liquid reservoir. The liquid coating roller is located on an outer side of the liquid reservoir. The liquid squeezing roller is located between the liquid taking roller and the liquid coating roller. Two sides of the liquid squeezing roller are respectively in contact with the liquid taking roller and the liquid coating roller. The liquid dopant source is taken out from the liquid reservoir by the liquid taking roller. The liquid dopant source on the liquid taking roller is transferred to the liquid squeezing roller, rolled evenly by the liquid squeezing roller, then transferred to the liquid coating roller, and coated onto the surface of the silicon wafer by the liquid coating roller. The liquid coating roller is a sponge roller having a soft outer surface, so as not to damage the silicon wafer. In the roller coating process, to ensure that the liquid squeezing roller can stably transfer the liquid dopant source to the sponge roller, it is necessary to control the degree by which the liquid squeezing roller is pressed into the sponge roller, so that a part of the sponge roller in contact with the liquid squeezing roller is in a local squeezed state. After shutdown, if the sponge roller remains in the local squeezed state for a long time, the sponge roller undergoes serious deformation, affecting the roller coating effect. Therefore, it is necessary to design a chain-type roller coating apparatus that can adjust the position of the liquid coating roller. SUMMARY Technical Solutions The present disclosure provides a chain-type roller coating apparatus that can adjust the position of a liquid coating roller, including a roller bed configured to convey a silicon wafer and a liquid coating roller horizontally arranged and configured for roller-coating a dopant source onto the silicon wafer on the roller bed, the roller bed includes a plurality of conveying rollers arranged sequentially along a conveying direction of the roller bed and a transmission mechanism configured to drive the plurality of conveying rollers to rotate; and the plurality of conveying rollers are horizontally arranged and parallel to each other;the liquid coating roller is parallel to the plurality of conveying rollers; the liquid coating roller is equipped with a synchronizing wheel configured to drive the liquid coating roller to rotate, the synchronizing wheel is located on an outer side of an axial end of the liquid coating roller, an axis of the synchronizing wheel is parallel to an axis of the liquid coating roller, and the axis of the synchronizing wheel and the axis of the liquid coating roller are located in an identical vertical plane; and the synchronizing wheel is equipped with a driving mechanism configured to drive the synchronizing wheel to rotate;the synchronizing wheel is further provided with a mounting hole, the mounting hole is a straight elongated hole, the mounting hole extends along a radial direction of the synchronizing wheel, and the mounting hole extends across the axis of the synchronizing wheel; a proximity switch is further arranged on an outer side of the synchronizing wheel, and the proximity switch and the axis of the synchronizing wheel are located in an identical vertical plane; the synchronizing wheel is further provided with a trigger element which is configured to be sensed by the proximity switch, the trigger element i