baber/WOPTO huggingface dataset:
Patent WO-2020135412-A1 (WO)
Title: 用于nvdimm的数据备份和恢复方法、nvdimm控制器以及nvdimm
Inventor: ZHOU XIAOFENG
IPC: G06F11/14
Filed: 2019-12-24
Abstract: 一种用于NVDIMM的数据备份和恢复方法、NVDIMM控制器以及NVDIMM。NVDIMM(200)包括DRAM(201)、NAND闪存(202)和NVDIMM控制器(100)，NVDIMM控制器(100)控制NVDIMM(200)并包括DDR控制器(101)、NAND闪存控制器(102)、数据备份模块(103)和数据恢复模块(104)，DRAM(201)采用DBI并使能DBI。在数据备份时，DDR控制器(101)从DRAM(201)读取N位DQ i和1位DBI i并将其发送至数据备份模块(103)，当DBI i为1时，数据备份模块(103)比较DQ i和DQ i-1,如果DQ i和DQ i-1中值不相同的位数大于N/2，则翻转DQ i，并将DBI i置为0，否则保持DQ i和DBI i不变；当DBI i为0时，DQ i和DBI i保持不变，数据备份模块(103)将经处理的DQ i和DBI i发送至NAND闪存控制器(102)，NAND闪存控制器(102)将经处理的DQ i和DBI i写入NAND闪存(202)。
Patent WO-2020215781-A1 (WO)
Inventor: LIANG CHENGDU
IPC: H01M10/058
Filed: 2019-12-27
Abstract: A battery and a device comprising the battery, relating to the field of batteries. The battery comprises a positive electrode sheet (1), a negative electrode sheet (2) and an electrolyte; a positive electrode current collector (10) comprises an insulating layer (101) and a conductive layer (102), the insulating layer (101) is used for bearing the conductive layer (102), the conductive layer (102) is used for bearing a positive electrode active material layer (11), the conductive layer (102) is located on at least one surface of the insulating layer (101), the conductive layer (102) has a thickness of D2, D2 satisfies: 300 nm ≤ D2 ≤ 2 μm, and a protective layer (103) is provided on at least one surface of the conductive layer (102); and a negative electrode current collector (20) is a copper foil current collector having a thickness of 1 μm to 5.9 μm. The battery can improve the safety performance of the battery, has good rate performance, and can also improve the weight and energy density of the battery.
Patent WO-2021134474-A1 (WO)
Inventor: YE BO
IPC: G01N35/00
Filed: 2019-12-31
Abstract: 本发明一种样本分析系统及方法，样本分析系统包括：血液细胞分析仪、涂片制备装置、细胞图像分析装置、运送装置、样本信息获取装置和控制装置，控制装置配置用于从血液细胞分析仪获取检测结果信息以及从样本信息获取装置获取样本信息，当检测结果信息满足预定条件时，控制运送装置中的第一运送轨道将待测样本运送至涂片制备装置，以便涂片制备装置制备样本涂片，控制运送装置的第二运送轨道将样本涂片从涂片制备装置运送到细胞图像分析装置；并根据待测样本的样本信息，从预设分析模式集合中确定细胞图像分析装置的运行模式，控制细胞图像分析装置在运行模式下对样本涂片进行图像拍摄和分析，由此实现自动确定细胞图像分析装置的运行模式。
Patent WO-2020207077-A1 (WO)
Inventor: LAN SONG
IPC: G02F1/1333
Filed: 2020-01-06
Abstract: 一种显示装置和显示装置的制备方法，显示装置包括对盒设置的第一基板（10）和第二基板（20），第一基板（10）与第二基板（20）之间形成有液晶盒，液晶盒内注入有液晶混合物（40），液晶混合物（40）包括液晶（41）、聚合物（42）和光敏材料（43）。当环境光强度逐渐增大时，光敏材料（43）在光的激发作用下变为导体，聚合物（42）基底的阻抗变小，因此降低了显示装置的驱动电压。
Patent WO-2021017432-A1 (WO)
Inventor: CHU YU
IPC: G06F16/27
Filed: 2020-01-14
Abstract: 一种基于区块链的报销费用分割方法、装置及电子设备，该方法包括：接收报销受理方发送的目标交易（502）；所述目标交易中携带有目标电子票据标识；响应于所述目标交易，调用部署在所述区块链上的智能合约中声明的费用分割逻辑，基于所述区块链存证的与所述目标电子票据标识对应的报销信息中的未报销金额，生成费用分割单（504）；将所述费用分割单发布至所述区块链进行存证（506）。
Patent WO-2020156408-A1 (WO)
Inventor: MEDLES ABDELKADER
IPC: H04W52/02
Filed: 2020-01-22
Abstract: La présente invention concerne diverses solutions pour la réduction de consommation d'énergie grâce à un fonctionnement à liaisons multiples relativement à un équipement utilisateur et à un appareil de réseau dans des communications mobiles. Un appareil peut établir une première liaison avec un premier nœud de réseau. L'appareil peut établir une seconde liaison avec un second nœud de réseau. L'appareil peut recevoir une indication d'état de sommeil par l'intermédiaire d'une signalisation de couche physique provenant du premier nœud de réseau. L'appareil peut transmettre un état de sommeil du second nœud de réseau en fonction de l'indication d'état de sommeil.
Patent WO-2021151250-A1 (WO)
Title: Method to add new radio for a user equipment
Inventor: LI XIAOYU
IPC: H04W76/15
Filed: 2020-01-31
Abstract: The present disclosure relates to addition of new radio for a user equipment (UE). For example, a method of wireless communication includes establishing, by a UE, a first connection with a first cell. The method also include, while the first connection between the UE and the first cell is present, detecting a trigger condition. The method further includes, based on the trigger condition and while the UE has not added a second cell group: initiating, by the UE, a local release of the first connection, and transmitting, by the UE, a tracking area update request to the first cell. Other aspects and features are also claimed and described.
Patent WO-2020164427-A1 (WO)
Inventor: ZHU KAI
IPC: D06F39/14
Filed: 2020-02-06
Abstract: 本发明属于滚筒洗衣机领域，公开了一种可以更换打开方向的洗衣机门体，门体上设置有观察窗，在门体上设有第一固定位和第二固定位；所述门体还包括门钩组件，可拆卸地安装在第一固定位/第二固定位；铰链组件，可拆卸地安装在第二固定位/第一固定位，所述门钩组件与铰链组件可进行对换安装以更换门体打开方向。所述门钩组件包括门钩固定座，所述门钩固定座可拆卸的安装在第一固定位/第二固定位；铰链组件包括铰链固定座，铰链固定座可拆卸的安装在第二固定位/第一固定位，所述门钩固定座与铰链固定座可进行对换安装以更换门体打开方向。本发明可以通过互换门钩组件和铰链组件的位置即可更换洗衣机门体的打开方向，拆卸和安装更加简单和安全。
Patent WO-2021042677-A1 (WO)
Inventor: WANG HUAWEI
IPC: H01R13/6471
Filed: 2020-02-17
Abstract: 本申请公开了一种连接器组件。上述的连接器组件包括第一连接器和第二连接器，第一连接器包括第一基体、第一接地端子和第一屏蔽片，第一接地端子和第一屏蔽片均设于第一基体，且第一接地端子与第一屏蔽片电连接；第二连接器包括第二基体、第二接地端子和第二屏蔽片，第二接地端子和第二屏蔽片均设于第二基体，第二接地端子与第二屏蔽片电连接，第二接地端子与第一接地端子电连接。
Patent WO-2021056960-A1 (WO)
Inventor: FAN CHEN-CHIH
IPC: H01L27/146
Filed: 2020-02-26
Abstract: 本发明提供一种影像感测模块，包括影像传感器芯片、微透镜阵列、围墙结构及滤光片。微透镜阵列配置于影像传感器芯片上，围墙结构形成于影像传感器芯片上，且滤光片配置于围墙结构上。
Patent WO-2020216037-A1 (WO)
Title: Control device, camera device, movable body, control method and program
Inventor: HONJO KENICHI
IPC: G03B13/20
Filed: 2020-04-03
Abstract: Among respective distances in a plurality of regions measured by a distance measuring sensor, the distance corresponding to a photographed object that passes through the lens optical axis of a camera device varies according to differences in the distance to the photographed object. Provided is a control device, which may be a control device for controlling a camera device, wherein the camera device comprises a distance measuring sensor that uses a first image sensor to measure the distance to a photographed object associated with each of a plurality of regions. The control device may comprise a circuit which is configured to determine the distance to the photographed object that passes through the lens optical axis of the camera device from among a plurality of distances on the basis of the plurality of distances measured by the distance measuring sensor, a first distance between the lens optical axis of the camera device and the lens optical axis of the distance measuring sensor, and the angle of view of the distance measuring sensor.
Patent WO-2021000616-A1 (WO)
Inventor: ZOU BING
IPC: H04J14/02
Filed: 2020-04-03
Abstract: Disclosed in an embodiment of the present invention is a wavelength selective switch, comprising: an input optical fiber collimation array comprising multiple input ports; a relay lens positioned between a first switching engine and a second switching engine; a first lens assembly comprising A lenses and a second lens assembly comprising B lenses, wherein each of A and B is a natural number greater than or equal to 2, the first lens assembly is connected to the first switching engine and the relay lens, the second lens assembly is connected to the relay lens and the second switching engine, and each of the first lens assembly and the second lens assembly comprises a lens having a curvature in a dispersion direction; and an output optical fiber collimation array comprising multiple output ports. Arrangement of two or more lens assemblies between switching engines reduces filtering costs of a wavelength selective switch, and increases the filtering bandwidth of the wavelength selective switch.
Patent WO-2020216175-A1 (WO)
Inventor: ZHANG LI
IPC: H04N19/103
Filed: 2020-04-20
Abstract: Devices, systems and methods related to digital video coding, and specifically, to management of syntax flags with respect chroma formats are described. In one representative aspect, the disclosed technology may be used to provide a method for video decoding. The method includes determining a chroma format associated with a region of a video and determining, based on the chroma format, whether one or more syntax flags applicable to the region of the video are included in a syntax structure of a coded representation of the video. The one or more syntax flags are indicative of a joint chroma residual coding step for representing the region in the coded representation. The method also includes generating one or more decoded video blocks of the region by parsing the coded representation according to a presence or an absence of the one or more syntax flags in the coded representation.
Patent WO-2021208128-A1 (WO)
Title: Lithium ion battery
Inventor: CHEN JACK
IPC: H01M50/167
Filed: 2020-04-23
Abstract: A lithium ion battery, comprising: a housing assembly, comprising a housing, a cover plate and a sealing piece, an outwardly protruding brim being arranged at an opening of the housing, an inwardly opening accommodating groove being arranged on the brim, the sealing piece covering the periphery of the cover plate, an outer side of the sealing piece abutting against an inner wall of the accommodating groove; a cell assembly, arranged within the housing, the cell assembly being provided with a positive electrode tab and a negative electrode tab, the positive electrode tab being connected to the cover plate, the negative electrode tab being connected to the housing.
Patent WO-2021217698-A1 (WO)
Inventor: ZHENG YUEJIU
IPC: G01R31/367
Filed: 2020-05-09
Abstract: A diagnosis method for distinguishing a micro-short-circuit fault of a battery from a small-capacity fault of the battery. The method comprises: estimating a mean state of charge SOC mean  of a battery pack, and the difference (dSOC) between the state of charge of each cell and the mean state of charge of the battery pack, and then obtaining the SOC of each cell (S1); under charging and discharging working conditions, respectively calculating the quantity of charges transferred by each cell at each moment and SOC variable amount of each cell, and then estimating, by using a least square method, the capacities of each battery cell under the charging and discharging working conditions (S2); and comparing charging and discharging capacity estimation results of the battery cells, wherein battery cells with similar capacities and similar charging and discharging capacities are normal cells; a cell with an estimated value under the discharging working condition being less than that of a normal cell and with an estimated value under the charging working condition being greater than that of a normal cell is a micro-short-circuited cell; and a cell with estimated values under the charging and discharging working conditions both being less than those of the normal cell is a small-capacity cell (S3). The diagnosis method, which is accurate in terms of a diagnosis result, and can be used for effectively distinguishing a micro-short-circuit fault of a battery from a small-capacity fault of the battery, is provided.
Patent WO-2020253454-A1 (WO)
Title: 一种基于wo3纳米薄膜的可燃气体传感器
Inventor: LIU PENG
IPC: G01N27/30
Filed: 2020-05-20
Abstract: 本实用新型公开了一种基于WO3纳米薄膜的可燃气体传感器，所述传感器为平板式结构，自下而上依次包括单晶硅片、二氧化硅纳米薄膜、氮化硅纳米薄膜、铂金电极薄膜和WO3纳米薄膜。本实用新型的传感器以WO3纳米薄膜为敏感材料，所述WO3纳米薄膜由磁控溅射镀膜制得，对可燃气体如氢气和一氧化碳具有较高的灵敏度。
Patent WO-2021237421-A1 (WO)
Inventor: TANG GUOJIE
IPC: F16H61/14
Filed: 2020-05-25
Abstract: 本发明公开了液力变矩器状态切换控制方法、装置、车辆及存储介质，该方法包括当车辆的液力变矩器处于闭锁状态时，获取目标指令，所述目标指令触发车辆的传动系统力矩传递方向的变化；获取状态参量，根据所述状态参量判断当前车辆是否处于目标工况；若当前车辆处于目标工况，则将液力变矩器切换为打开状态，在所述打开状态下保持预设时间后，将所述液力变矩器切换回闭锁状态。本公开通过精准识别目标工况，在目标工况条件下控制液力变矩器迅速短暂打开，在传输系统力矩传递方向被切换时吸收传动部件撞击产生的震荡，降低车辆抖动，通过控制液力变矩器短暂打开之后再次闭合，降低油量消耗，在保证燃油经济性的基础上平顺用户的驾驶体验。
Patent WO-2020248884-A1 (WO)
Title: Support pliant
Inventor: LIN BEN TIEN
IPC: F16M11/04
Filed: 2020-06-04
Abstract: La présente invention concerne un support pliant (1). Les contours d'un premier corps de panneau (10) et d'un second corps de panneau (11) correspondent les uns aux autres et forment généralement un motif rectangulaire. Des parties de raccordement (12) sont respectivement agencées sur des côtés longs du premier corps de panneau (10) et du second corps de panneau (11), entraînant le raccordement des deux corps de panneau l'un à l'autre. Un premier segment de cintrage (13) est formé sur le premier corps de panneau (10) et est parallèle à son côté long, et les deux extrémités dudit segment sont positionnées à des emplacements centraux des deux côtés courts du premier corps de panneau (10). Un deuxième segment de cintrage (14) est formé sur le premier corps de panneau (10) et est parallèle à son côté long, et les deux extrémités dudit segment sont positionnées à des emplacements non centraux des deux côtés courts du premier corps de panneau (10). Des points de cintrage (15) sont formés sur le premier segment de cintrage (13), et deux troisièmes segments de cintrage (151) sont formés s'étendant à partir de chaque point de cintrage (15) vers le côté court adjacent du premier corps de panneau (10). Pour les troisièmes segments de cintrage (151), qui forment un agencement d'intersection avec le deuxième segment de cintrage (14), une extrémité est un point de cintrage (15), et l'autre extrémité est le coin opposé du premier corps de panneau (10). Un quatrième segment de cintrage (16) est formé sur le second corps de panneau (11) et est parallèle à son côté long, et les deux extrémités dudit segment sont positionnées à des emplacements non centraux des deux côtés courts du second corps de panneau (11). Ainsi, les panneaux peuvent être pliés pour former une forme de corps de support, permettant à un utilisateur de placer un article tel qu'un dispositif mobile en vue d'une utilisation ou d'une visualisation. La présente invention est très pratique d'utilisation.
Patent WO-2021036468-A1 (WO)
Inventor: DAI CHAO
IPC: H04W72/04
Filed: 2020-06-28
Abstract: Disclosed in the embodiments of the present application are a communication method and system for a wireless local area network (WLAN). Said method comprises: an access point (AP) and a wireless terminal (STA) associated with a normal WLAN negotiate to enter a dual-mode transmission mode, the AP and the STA both supporting a first frequency band and a second frequency band, and the dual-mode transmission mode using the first frequency band to perform uplink transmission and using the second frequency band to perform downlink transmission, or using the second frequency band to perform uplink transmission and using the first frequency band to perform downlink transmission. In this way, the access transmission rate of the WLAN is improved without significantly increasing device hardware costs.
Patent WO-2021248581-A1 (WO)
Title: 空气和氧气混合监测的湿化治疗仪及其监测方法
Inventor: ZHANG QIANG
IPC: A61M16/10
Filed: 2020-06-29
Abstract: 本发明公开一种空气和氧气混合监测的湿化治疗仪及其监测方法，属于医疗机械技术领域，本发明利用超声波氧浓度传感器对湿化治疗仪输出的氧气浓度与气体流量进行实时监测，并且将检测结果实时反馈至系统计算机，系统计算机根据实时检测结果，通过调节与氧气入口连接的控氧模块和与进气口相连的流量控制阀共同调节湿化治疗仪当前的氧气浓度与气体输出流量。当气体流量或氧气浓度出现异常时，系统计算机将及时控制湿化治疗仪的控氧模块与流量控制阀进行调节，确保湿化治疗仪输出的气体流量以及氧气浓度符合要求，提高湿化治疗仪的可靠性，提高居家治疗的安全性。
Patent WO-2021237884-A1 (WO)
Title: Methods for forming three-dimensional memory devices
Inventor: ZHANG KUN
IPC: H01L27/1157
Filed: 2020-07-07
Abstract: Embodiments of 3D memory devices and methods for forming the same are disclosed. In an example, a method for forming a 3D memory device is disclosed. A sacrificial layer on a substrate, a first stop layer on the sacrificial layer, a P-type doped semiconductor layer having an N-well on the first stop layer, and a dielectric stack on the P-type doped semiconductor layer are sequentially formed. A plurality of channel structures each extending vertically through the dielectric stack and the P-type doped semiconductor layer are formed, stopping at the first stop layer. The dielectric stack is replaced with a memory stack, such that each of the plurality of channel structures extends vertically through the memory stack and the P-type doped semiconductor layer. The substrate, the sacrificial layer, and the first stop layer are sequentially removed to expose an end of each of the plurality of channel structures. A conductive layer is formed in contact with the ends of the plurality of channel structures.
Patent WO-2021208269-A1 (WO)
Title: Electrical heating layer structure of internal-heating-type electronic cigarette heating rod
Inventor: YAO JIANHAO
IPC: A24F40/46
Filed: 2020-07-07
Abstract: An electrical heating layer structure of an internal-heating-type electronic cigarette heating rod. The electrical heating layer structure is attached to the surface of a base bar (1), and comprises a thin-film-like first resistor layer and a thin-film-like second resistor layer which are electrically insulated from each other, wherein the axial directions, which are perpendicular to the base bar (1), of the first resistor layer and the second resistor layer are called transverse directions; axial upper ends of the first resistor layer and the second resistor layer are electrically connected to each other, and axial lower ends of the first resistor layer and the second resistor layer are respectively provided with an extraction electrode (3); the first resistor layer and the second resistor layer each include a resistor layer body; the resistor layer body is provided with several transverse first slits (41a), which are led out from the left side edge of the resistor layer body, and several transverse second slits (41b), which are led out from the right side edge of the resistor layer body; the lengths of the first slits (41a) and the second slits (41b) are all smaller than the width of the resistor layer body; and the first slits (41a) and the second slits (41b) are alternately arranged in the axial direction to divide the resistor layer body into several transverse strips that are connected to each other in series. By using the electrical heating layer structure of the internal-heating-type electronic cigarette heating rod, most of the heat lost at the head portion and the tail portion of the heating rod can be compensated for, such that the temperature of the whole internal-heating-type electronic cigarette heating rod is uniform.
Patent WO-2021203580-A1 (WO)
Inventor: WANG YUJUN
IPC: F22B1/30
Filed: 2020-07-23
Abstract: 本发明涉及电极锅炉技术领域，尤其涉及一种供热系统调峰蓄热用电极锅炉及其应用。所述电极锅炉包括：内桶：设置在外壳的空腔内；密封盖：用于密封外壳的上开口；所述密封盖上设置出汽管、电机；出水管：其一端位于内桶的底部，另一端位于外壳外部；丝杆：其一端和电机连接，另一端穿过密封盖后位于内桶中的加热装置连接；进水管：其一端位于内桶中，且进水管内和进水管上分别设置过滤装置、加压泵；温度传感器：用于检测内筒内的水温；控制器：用于根据温度传感器反馈的信息控制电机和/或电极动作。本发明设计的电极锅炉通过丝杆和滑台的配合，使得电极可以在内桶中上下移动改变电极与水的接触面积，进而改变电极的加热负荷。
Patent WO-2021018076-A1 (WO)
Inventor: YOUN YOUNG
IPC: F04D29/70
Filed: 2020-07-27
Abstract: 一种静压轴承（102）供气系统，包括：压缩机（100），具有冷媒出口（101）和静压轴承（102）；供气管（200），连通冷媒出口（101）和静压轴承（102）的进气口，并设有过滤器（300）；冷媒出口（101）排出的冷媒进入供气管（200）经过过滤器（300）进入静压轴承（102）的进气口。一种制冷设备，包括：静压轴承（102）供气系统。
Patent WO-2021042908-A1 (WO)
Title: Track vibration detection method and apparatus, and vibration detection device
Inventor: GAO FENGBO
IPC: G01M13/00
Filed: 2020-07-27
Abstract: A track vibration detection method, comprising: acquiring a track vibration video of a track to be detected, and selecting a first RGB image according to the track vibration video of said track (S201); linearly converting the first RGB image from an RGB color space into a YIQ color space to obtain a first YIQ image (S202); processing a Y-channel image in the first RGB image by means of a video amplification algorithm in order to obtain a feature image sequence (S203); extracting, according to the feature image sequence, actual vibration data of said track (S204); and determining the stability of said track according to the actual vibration data (S205). The method can improve the accuracy of vibration data extraction and the universality of engineering uses, and can then improve the efficiency, accuracy and reliability of track vibration detection. Further provided are a track vibration detection apparatus, and a vibration detection device.
Patent WO-2022020999-A1 (WO)
Inventor: ZHANG HUI
IPC: B60L15/00
Filed: 2020-07-27
Abstract: A power supply apparatus, a vehicle and a device. An integrated electric energy conversion apparatus comprises a DCF module and a bidirectional OBC module. The integrated electric energy conversion apparatus further comprises any one of a low-voltage direct-current converter (DCL) module, a high-voltage direct-current converter (DCH) module and a power distribution unit (PDU) module. The PDU module is respectively connected to the bidirectional OBC module and the DCF module; the DCL module is used for converting a first direct current in a power battery from a first voltage to a second voltage to obtain a second direct current, so that the second direct current is used for supplying power to a first power utilization module, wherein the first voltage is larger than the second voltage; and the DCH module is used for converting the first direct current in the power battery from the first voltage to a third voltage to obtain a third direct current, so that the third direct current is used for supplying power to a second power utilization module, wherein the first voltage is smaller than the third voltage. The apparatus can improve use efficiency.
Patent WO-2022021396-A1 (WO)
Inventor: CHEN YUANLIAN
IPC: G06Q40/00
Filed: 2020-07-31
Abstract: An e-commerce transaction system (100), applicable in the technological field of e-commerce, and comprising: a user terminal (120), an e-commerce platform (110), a server (130), a business terminal (140), and a bank client end (150); the e-commerce platform (110) comprises an online price negotiation module (111), a transaction billing module (112), an information storage module (113), an information synchronization and update module (114), and an information security and authentication module (115). The present invention improves transaction efficiency, and saves storage space for an e-commerce system.
Patent WO-2022027183-A1 (WO)
Title: Perform network speed tests on a wireless client device using a master device
Inventor: JIANG FENG
IPC: H04W24/08
Filed: 2020-08-03
Abstract: A wireless master device to remotely perform network speed tests on a wireless client device that is not in the possession of the user. A user interface (UI) is provided that displays a list of client devices that may be selected to be the wireless master device and a list of client devices that may be selected to perform the speed test. A start instruction is wirelessly sent to start the speed test on the selected client device. Network speed test results of the client device are received by the wireless master device and presented in the UI. The UI presents options for selecting a type of speed test to perform. The UI includes an area where messages and the test results are presented.
Patent WO-2022000704-A1 (WO)
Inventor: CHAN TAKWO
IPC: H05K3/00
Filed: 2020-08-07
Abstract: Provided is a uniform liquid distribution processing apparatus for a printed circuit board, comprising a material-loading mechanism (10), a positioning mechanism (20), and a drive mechanism (30), said material-loading mechanism (10) being in the shape of a disc and used for fixing a printed circuit board; the positioning mechanism (20) at least comprises a first positioning wheel (21) and a second positioning wheel (22) which can jointly support the material-loading mechanism (10); the positioning mechanism (20) can switch between a first state and a second state; when the positioning mechanism (20) is in the first state, the material-loading mechanism and the drive mechanism (30) are spaced apart; when the positioning mechanism (20) is in the second state, the drive mechanism (30) can drive the material-loading mechanism (10) to rotate about its central axis; both the first positioning wheel (21) and the second positioning wheel (22) can rotate with the rotation of the material-loading mechanism (10). The drive mechanism (30) drives the printed circuit board to rotate, avoiding the pooling effect and preventing residual liquid from causing over-treatment of the local area of the board surface, improving processing uniformity.