baber/WOPTO huggingface dataset:
Patent WO-2021012338-A1 (WO)
Inventor: YI SILIANG
IPC: H04M1/04
Filed: 2019-08-20
Abstract: A cup having a smart apparatus support comprises a cup body (1) and a supporting plate (2). The cup body (1) has a recess (11) extending upwards in a height direction thereof from the bottom of a sidewall of the cup body (1). One end of the supporting plate (2) is rotatably connected to an inner wall of the recess (11), such that the supporting plate (2) can rotate between a use position and a storage position. When in the storage position, the supporting plate (2) is received in the recess (11). When in the use position, the supporting plate (2) extends outwardly in a width direction of the bottom of the cup body (1). The back of a smart apparatus respectively contacts sidewalls of the supporting plate (2) and the cup body (1) to constitute a triangular supporting structure. In the invention, a support is added to a cup without changing the original shape of the cup, such that a smart apparatus can be supported on the support without needing to be held by hands of a user. The invention can be used conveniently.
Patent WO-2021035528-A1 (WO)
Inventor: TANG LINGYU
IPC: G06F3/044
Filed: 2019-08-27
Abstract: 一种主动笔驱动电路、驱动方法、驱动芯片及主动笔。主动笔驱动电路包括电压产生电路（100）和开关电路（200）；电压产生电路（100）与开关电路（200）连接；开关电路（200）控制电压产生电路（100）按照直流正电压、零电压、直流负电压、零电压的顺序周期性地输出以产生第一驱动信号用于驱动主动笔的电极，解决了主动笔驱动时可能产生的器件烧坏的问题。
Patent WO-2021031270-A1 (WO)
Inventor: WANG ZHENLING
IPC: A61K39/00
Filed: 2019-09-19
Abstract: 属于微生物学领域，具体涉及一种从细菌中分离的膜囊泡(MVs)以及所述膜囊泡的分离和制备系统及方法，以及所述膜囊泡的应用。所述的细菌包括革兰氏阳性菌和革兰氏阴性菌。采用电离射线辐照细菌，分离并纯化其产生的膜囊泡，制得的膜囊泡可作为疫苗、疫苗佐剂、和/或药物载体。还提供一种生物组合物，包括所述膜囊泡和灭活细菌。还提供一种细菌膜囊泡的制备及分离纯化系统以及相应的方法，利用该系统及方法制得的膜囊泡产量大、纯度高、易于工业化生产。
Patent WO-2020088306-A1 (WO)
Inventor: ZENG QINGBING
IPC: A61K38/28
Filed: 2019-10-22
Abstract: 一种用于胰岛素口服递送的复合载体，其由两嵌段共聚物MePEG-PLGA为基质，分别制备成带有正带电荷和带有负电荷的两种纳米粒，混合后相互交联形成聚电解质复合物。该胰岛素聚电解质复合物口服给药后，能避免药物通过胃时胃酸及酶等环境对胰岛素活性的破坏，使药物顺利到达肠道吸收部位，具有pH敏感性。这一口服制剂具有良好的降血糖效果及缓控释作用，可以用于胰岛素和蛋白类的药物的口服递送。
Patent WO-2020155704-A1 (WO)
Title: 一种户外家具用消声扣及其安装结构
Inventor: WU XIANGYONG
IPC: F16B45/00
Filed: 2019-10-30
Abstract: 一种户外家具用消声扣及其安装结构，属于连接件技术领域，包括消声扣外配合面（100）和与之相对的消声扣内配合面（101），消声扣外配合面（100）和消声扣内配合面（101）分别用以抵接两个挂接部件的挂接面，并起到隔离消声作用，同时能够阻止挂钩与挂钩之间的直接摩擦，消除了异常的响动，减少了保护层的损耗，从而延长了产品的使用寿命。
Patent WO-2020094108-A1 (WO)
Title: Endoscopic insertion portion structure
Inventor: ZHANG YI
IPC: A61B1/005
Filed: 2019-11-08
Abstract: Discloses is an endoscopic insertion portion structure, wherein same belongs to the technical field of the structure of internal tubes of medical appliances, and solves the technical problem of unstable deflection of a tail end of a ureter. The endoscopic insertion portion structure comprises a catheter body (1). The catheter body (1) comprises a stepped braided tube (2), a bending tube (3) and a plastic catheter head (14) joined to each other, wherein a joint between the stepped braided tube (2) and the bending tube (3) is sleeved with a first stainless steel outer tube (4), and the first stainless steel outer tube (4) is coated with a first PET heat-shrinkable thin film (5); a second stainless steel outer tube (6) is connected between the bending tube (3) and the plastic catheter head (14), and the second stainless steel outer tube (6) is coated with a second PET heat-shrinkable thin film (7); a traction wire (8) is provided inside the catheter body (1), with one end of the traction wire (8) being fixed to the bending tube (3), and the other end thereof passing out of the stepped braided tube (2); and a heat-shrinkable sleeve (9) is arranged outside the bending tube (3). A tail end of a ureter can be subjected to independent multi-section bending and a better detection effect can be realized.
Patent WO-2021056755-A1 (WO)
Inventor: WU QICHAO
IPC: B65G47/52
Filed: 2019-11-14
Abstract: Disclosed are a logistics lifting system (100) and a control method therefor. The logistics lifting system (100) comprises a sending station (1) and a plurality of receiving stations that are arranged in the vertical direction, a vertical lifting mechanism (2) used for conveying objects between the sending station (1) and the plurality of receiving stations, and a control unit used for controlling the operation of the logistics lifting system (100), wherein the vertical lifting mechanism (2) comprises at least two storage layers (21) arranged at intervals in the vertical direction; the sending station (1) is provided with output lines (11); the output lines (11) and the vertical lifting mechanism (2) are both in communication connection with the control unit; the control unit can control the vertical lifting mechanism (2) to move in the vertical direction, so that the at least two storage layers (21) can respectively correspond to the output lines (11); and therefore, logistics boxes in the full-box state can be placed in the at least two storage layers (21) by means of the output lines (11), the amount conveyed by the vertical lifting mechanism (2) in one step is increased, the conveying efficiency is improved, and the existing requirement for the timeliness of material conveying is met.
Patent WO-2021017320-A1 (WO)
Title: Organic light-emitting device, display apparatus, and manufacturing method of organic light-emitting device
Inventor: WANG JUNYUAN
IPC: H01L27/32
Filed: 2019-11-18
Abstract: An organic light-emitting device (100), a display apparatus (200), and a manufacturing method of the organic light-emitting device (100). The organic light-emitting device (100) is provided with a display region (10) and a camera-under-panel region (20). The camera-under-panel region (20) comprises an array substrate (1), a pixel definition layer (2), an anode layer (3), a plurality of sub-pixels (4), and at least one cathode trace (5). The cathode trace (5) is disposed on the pixel definition layer (2) to connect the plurality of sub-pixels (4) in series. The display apparatus (200) comprises the organic light-emitting device (100) and a sensor (30), and the camera-under-panel region (20) is disposed corresponding to the position of the sensor (30).
Patent WO-2021093024-A1 (WO)
Title: Liquid crystal panel and display device
Inventor: YU JIAJIA
IPC: G02F1/1339
Filed: 2019-11-27
Abstract: A liquid crystal panel (100) and a display device. One end of a spacer (107) is located on a color resist layer (103) in a first substrate, and the other end thereof is embedded on a common electrode (1081) in a second substrate. When the liquid crystal display panel (100) is pressed, the material of the color resist layer (103) is relatively hard, not being easy to compress, thus ensuring that the deformation and recovery speed of the spacer (107) is close to the rebound speed of liquid crystals (1061), the space in a liquid crystal cell is filled with the liquid crystals (1061) in a liquid crystal layer (106) and the spacer (107), and the liquid crystals (1061) cannot be peeled from an adhesive frame, avoiding the formation of a vacuum bubble, thereby improving the display quality of the liquid crystal display panel (100).
Patent WO-2020108532-A1 (WO)
Inventor: LING HEPING
IPC: H01M10/615
Filed: 2019-11-27
Abstract: A vehicle thermal management system and a control method therefor, and a vehicle. The vehicle management system comprises a battery and electric drive thermal management system and an engine and heater core thermal management system; an air conditioning system exchanges heat with the battery and electric drive thermal management system by means of a heat exchanger; the engine and heater core thermal management system comprises an engine coolant flow path, a heating flow path, and a first four-way valve (8); the engine coolant flow path, the heating flow path, and a flow path where a battery in the battery and electric drive thermal management system is located are connected or disconnected by means of the first four-way valve (8), so as to achieve heat transfer among the coolant flow path, the heating flow path, and the flow path where the battery in the electric drive thermal management system is located. The vehicle thermal management system can achieve highly efficient thermal management of an entire vehicle and optimize energy consumption of the entire vehicle.
Patent WO-2021103048-A1 (WO)
Title: 测量肌肉肌纤维束线斜率和羽状角的方法及终端设备
Inventor: XIAO YANG
IPC: G06T7/00
Filed: 2019-12-02
Abstract: 本申请适用于生物检测技术领域，提供了一种测量肌肉肌纤维束线斜率和羽状角的方法及终端设备，所述测量肌肉肌纤维束线斜率的方法包括：定位获取到的肌肉超声图像中的肌膜线；在两条肌膜线中间区域截取超声肌纤维图像；在所述超声肌纤维图像上标注具有初始斜率的参照线，将标注有初始斜率参照线的所述超声肌纤维图像输入训练好的神经网络模型，若所述神经网络模型的输出结果不为预测角度正确，则重新标注具有不同于所述初始斜率的参照线，并将重新标注参照线的超声肌纤维图像输入训练好的所述神经网络模型，直至输出结果为预测角度正确为止，输出此时参照线的斜率，作为肌纤维束线的斜率。本申请实施例提高了测量方法的鲁棒性。
Patent WO-2021068387-A1 (WO)
Title: Non-contact vital sign detection device and system
Inventor: WANG YUANCHENG
IPC: A61B3/14
Filed: 2019-12-03
Abstract: The present invention is applicable to the technical field of vital sign detection, and provides a non-contact vital sign detection device (10) and a system. The device comprises a processing unit (100), a preset light source (200), a beam splitter (300), a camera (400), and a display unit (500). When detecting a first preset instruction, the processing unit (100) sends an emitting instruction to the preset light source (200) and sends a photographing instruction to the camera (400); the preset light source (200) receives the emitting instruction to outward emit preset light; the beam splitter (300) filters light that is reflected from eyes of a target user to the camera (400) on the basis of the preset light; the camera (400) receives the photographing instruction to photograph the eyes of the target user, and sends a photographed eye video to the processing unit (100); the processing unit (100) extracts iris information of the target user from the eye video and compares the iris information of the target user with preset iris information to determine a vital sign detection result; and the display unit (500) displays the vital sign detection result. The non-contact vital sign detection device (10) is easy to operate, convenient to carry, and wide in application range.
Patent WO-2020119678-A1 (WO)
Inventor: JIN ZONGWEN
IPC: C01B32/15
Filed: 2019-12-10
Abstract: The present invention provides a preparation method for carbon dots, comprising the following steps: providing a mixed system of a polycyclic aromatic hydrocarbon compound and concentrated sulfuric acid in accordance with a mass-to-volume ratio of 50mg:(1-5mL) of the polycyclic aromatic hydrocarbon compound to the concentrated sulfuric acid; heating the mixed system of the polycyclic aromatic hydrocarbon compound and the concentrated sulfuric acid at 25°C-80°C, and collecting the reacted solution after reacting for 1.5h-10min; dissolving the reacted solution into deionized water to form a mixed solution, adding an inorganic base to adjust the pH of the solution to be neutral; using a 3KD ultrafiltration tube to ultrafiltering the mixed solution and collecting products of which the molecular weight is greater than or equal to 3KD; using a 5KD ultrafiltration tube to ultrafiltering the products of which the molecular weight is greater than or equal to 3KD to obtain carbon dots of which the molecular weight is between 3KD-5KD.
Patent WO-2020140715-A1 (WO)
Inventor: OU YANG
IPC: H04B10/2575
Filed: 2019-12-11
Abstract: Provided are a relay network element device, a far-end network element device and an optical fiber distributed system. By improving functions of the relay network element device and the far-end network element device, multiple paths of antenna signals can be modulated, by means of analog modulation, onto an intermediate frequency carrier, and are then converted by means of a radio frequency photoelectric module (ROF), such that the multiple paths of antenna signals are transmitted and made remote by means of one optical fiber, which can greatly reduce the cost and the construction difficulty of an optical fiber distributed system of a multi-antenna high-bandwidth communication system, and promotes the application of a 5G NR optical fiber distributed system indoors.
Patent WO-2020220692-A1 (WO)
Inventor: CAO XUEZHI
IPC: G06F16/9038
Filed: 2019-12-13
Abstract: Provided are a deep neural network and a training method and apparatus therefor, an electronic device and a storage medium. The deep neural network comprises: an input layer network used for modeling input features to obtain low-level features; a hidden layer network used for modeling the low-level features so as to extract high-order features; and a prediction layer network comprising a single document prediction sub-network, a document list prediction sub-network, a single document prediction node and a document list prediction node, the single-document prediction sub-network being used for performing scoring prediction on the high-order features in a pointwise manner and outputting the prediction result by means of the single-document prediction node, and the document list prediction sub-network being used for performing scoring prediction on the high-order features in a listwise manner and outputting the prediction result by means of the document list prediction node.
Patent WO-2021103169-A1 (WO)
Title: 钙钛矿微球、混色光转换薄膜、以及显示器
Inventor: HU ZHIPING
IPC: H01L27/32
Filed: 2019-12-13
Abstract: 一种钙钛矿微球（10）和一种混色光转换薄膜（100）、其制备方法，以及显示器（1000），该钙钛矿微球（10）包括：多个无机钙钛矿晶体（11），作为钙钛矿微球（10）的球核；以及非晶氧化硅球壳（12），包覆多个无机钙钛矿晶体（11），采用具有包覆结构的红色和绿色钙钛矿微球（10），作为白光OLED显示器的光学转换材料，可提高有机发光材料的光子利用率，降低显示功耗，减少工艺难度及成本。
Patent WO-2021114302-A1 (WO)
Inventor: TAN JIANXIN
IPC: B60L53/80
Filed: 2019-12-13
Abstract: A locking mechanism for an electric bicycle, comprising a body (11), a power box (12), and a drive assembly (13). The drive assembly (13) is installed on the body (11); the body (11) comprises a carrying support (111); the power box (12) is detachably connected to the carrying support (111); the drive assembly (13) comprises a drive rod (131); the drive assembly (13) drives, by means of the drive rod (131), wheels on the body (11) to rotate; the drive assembly (13) also comprises a locking module (132); the locking module (132) comprises wedge blocks (1322), locking rods (1323), and springs (1324); one sides of the springs (1324) are connected to base surfaces, and the other sides are connected to the wedge blocks (1322); the locking rods (1323) are installed on the wedge blocks (1322); locking holes (1311) are provided in the side surfaces of the drive rod (131); the locking rods (1323) are connected to the locking holes (1311); a trapezoidal push block (1234) is installed on the power box (12); the trapezoidal push block (1234) is in contact with the slope surfaces of the wedge blocks (1322) and is placed on the carrying support (111) by means of the power box (12); and the trapezoidal push block (1234) pushes the wedge blocks (1322), so that the locking rods (1323) are disconnected from the locking holes (1311). The locking mechanism has a stable structure and is convenient to use.
Patent WO-2020140818-A1 (WO)
Inventor: HAN HAO
IPC: G06Q10/06
Filed: 2019-12-26
Abstract: 一种订单处理方法、装置、设备及存储介质。所述方法包括：从多个逻辑分区中确定目标订单所属的逻辑分区，作为目标逻辑分区（S201）；其中，一个逻辑分区关联至少一个工位以及多个库存容器，目标逻辑分区关联的多个库存容器中至少有一个库存容器容纳有目标订单所需的库存物品；将目标订单分配给目标逻辑分区关联的一个工位，作为目标工位（S202）；控制机器人将目标逻辑分区关联的多个库存容器中容纳有目标订单所需的库存物品的目标库存容器搬运到目标工位（S203）。
Patent WO-2021128328-A1 (WO)
Title: 发声器件
Inventor: SONG WEI
IPC: H04R9/02
Filed: 2019-12-27
Abstract: 本发明提供了一种发声器件，其包括盆架、振动系统和磁路系统，振动系统包括：上振膜，上振膜固定于盆架并共同围成收容空间，上振膜远离磁路系统的一侧与外界连通并充当上振膜发声的上前腔；呈环状的下振膜，下振膜的外周侧固定于所述盆架；上骨架分别与所述音圈和所述上振膜连接，下骨架与下振膜连接；呈环状的隔离振膜，隔离振膜的外周侧与盆架连接，其内周侧与上骨架及下骨架连接，下振膜、下骨架、隔离振膜以及盆架共同将收容空间分隔成用于下振膜发声的下前腔和用于所述下振膜及所述上振膜共用的后腔；盆架设发声孔，发声孔将下前腔与外界连通。与相关技术相比，本发明的发声器件声学响度更高，声学性能更好。
Patent WO-2021163827-A1 (WO)
Title: Elastomeric silicone materials and their applications
Inventor: CHEN YUSHENG
IPC: C08L83/07
Filed: 2020-02-17
Abstract: An article adapted to receive multiple battery cells, such as a battery module, which provides thermal insulation between adjacent battery cells using thermally insulating layers comprising a ceramifiable elastomeric silicone material, using fumed silica (amorphous SiO 2) or fumed silica (amorphous SiO 2) + quartz (crystalline SiO 2). There is also provided, the use of said ceramifiable elastomeric silicone material as a means of delaying and/or preventing thermal runaway in such an article. Typically, the battery cells for which this article is designed are lithium-ion battery cells.
Patent WO-2020211519-A1 (WO)
Inventor: DUAN FUHAI
IPC: B60K6/365
Filed: 2020-02-18
Abstract: 一种双电机混合发动机行星排动力总成，至少三部驱动机单独或联合地驱动至少两排行星排，经末级行星排变速地输出动力，当针对驱动机和/或行星排选择闭合(制动)和/或释放时，实现了单独驱动和联合(混合)驱动等模式，且若驱动机采用发动机混合电机还能够实现边驱动边储电模式，甚至还实现了发动机单独驱动前提下的电机转子制动模式，该动力总成具有结构紧凑、全制动器结构、节油节电性能强、寿命长、转动惯量小、动力强劲、振动噪音小、可靠性高和成本低等优势，适用于混合动力车辆。
Patent WO-2021142877-A1 (WO)
Inventor: ZHANG QIANG
IPC: E21B34/06
Filed: 2020-02-20
Abstract: Dispositif de distribution intelligent (3) comprenant une antenne (31), un lecteur (32), une batterie (33), un mécanisme d'entraînement (34), un mécanisme d'exécution (35) et un mécanisme de limitation de position (36). L'antenne est utilisée pour recevoir un signal électromagnétique provenant d'une étiquette électronique (21) sur un manchon coulissant (2). Le lecteur est relié à l'antenne et est utilisé pour identifier le signal électromagnétique reçu. Le mécanisme d'entraînement est relié au lecteur, de telle sorte que le lecteur, lors de l'identification du signal électromagnétique, commande le mécanisme d'entraînement à se déplacer. Le mécanisme d'exécution est relié au mécanisme d'entraînement, et le mécanisme de limitation de position est relié au mécanisme d'exécution. Le mécanisme d'entraînement entraîne le mécanisme d'exécution à se déplacer, de telle sorte que le mécanisme de limitation de position s'étend hors du dispositif de distribution intelligent. Le mécanisme de limitation de position peut venir en butée contre un tube interne à manchon coulissant (25), et pousser le tube interne à manchon coulissant pour coulisser par rapport à un tube externe à manchon coulissant (24), exposant ainsi un trou de sortie de liquide (23) sur le manchon coulissant. La batterie est reliée respectivement à l'antenne, au lecteur et au mécanisme d'entraînement, et est utilisée pour fournir de l'énergie au dispositif de distribution intelligent.
Patent WO-2020207224-A1 (WO)
Inventor: ZHAN SHENGSHEN
IPC: F16K31/11
Filed: 2020-03-20
Abstract: Cette invention concerne un robinet à induction à double commande à réglage de la température, comprenant un corps de robinet (1), un élément de vanne de mélange d'eau à double commande à poignée unique (2) pourvu d'une tige basculante (21), une électrovanne (3), un conduit de passage d'eau (4), un dispositif de commande (5), un dispositif d'induction magnétique (6) et un commutateur d'induction (7). L'élément de vanne de mélange d'eau à double commande à poignée unique est installé sur le corps de robinet. Le dispositif d'induction magnétique est utilisé pour détecter des changements dans la position de la tige oscillante, et le commutateur d'induction est utilisé pour détecter une opération d'un corps humain. Le robinet selon l'invention a deux modes d'utilisation, par commande manuelle et commande d'induction, et il peut être utilisé facilement par un utilisateur.
Patent WO-2020228435-A1 (WO)
Title: Method for modification in dual-connection mode and device
Inventor: LIU AIJUAN
IPC: H04W76/15
Filed: 2020-03-31
Abstract: Disclosed are a method for modification in dual-connection mode and a device, for use in solving the problem that the communication performance of a terminal is easily reduced after establishment or modification in the current dual-connection architecture. The method for modification in dual-connection mode provided in the present application comprises: an MN determines an SN for flow transfer, the MN sending to the SN a transfer instruction carrying the indication information of the PDU session to which the flow belongs, so that the SN determines, according to the received transfer instruction, whether to receive the flow transferred by the MN, wherein the indication information of the PDU session is used for indicating whether the MN transfers part or all of the flow under a PDU session. The method effectively improves the communication performance of a terminal in a communication process.
Patent WO-2021196233-A1 (WO)
Title: 低压差线性稳压电路
Inventor: XUE JIANFENG
IPC: G05F1/575
Filed: 2020-04-03
Abstract: 本申请实施例提供了一种低压差线性稳压电路，该电路包括：误差放大电路、电荷泵电路及输出反馈电路；误差放大电路的输出端与电荷泵电路的输入端连接；电荷泵电路包括第一开关模组、第一储能模块、第三开关模组、寄生电容、第二开关模组、第二储能模块及时钟控制电路；时钟控制电路分别与第一开关模组、第三开关模组及第二开关模组连接，用于控制第一开关模组、第三开关模组及第二开关模组是否闭合；电荷泵电路的输出端与输出反馈电路连接，输出反馈电路与误差放大电路连接。能够提供更高的电压，并且减少电压波动。
Patent WO-2021027298-A1 (WO)
Inventor: LI JUNJIE
IPC: G05D23/19
Filed: 2020-04-08
Abstract: Embodiments of the present application disclose a control method for a heat dissipation element. The method comprises: acquiring a detected temperature and a state parameter set of a first device, wherein the state parameter set is related to an operating temperature of the first device; determining, according to the state parameter set, numerical values of a first temperature parameter and a second temperature parameter in a target adjustment function, wherein the target adjustment function is a function which uses the detected temperature as an independent variable and uses heat dissipation efficiency of a heat dissipation element as a dependent variable; and determining the heat dissipation efficiency of the heat dissipation element according to the numerical values of the first temperature parameter, the second temperature parameter and the detected temperature, and controlling the operation of the heat dissipation element. The embodiments of the present application further provide a corresponding control device. As the first temperature parameter and the second temperature parameter in the target adjustment function are determined according to the state parameter set, the corresponding heat dissipation efficiency can be pre-determined in a case where the detected temperature does not change, thereby solving the problem that the detected temperature cannot reflect the actual temperature in real time and then the heat dissipation efficiency cannot be adjusted in a untimely manner.
Patent WO-2021217341-A1 (WO)
Inventor: GAO DI
IPC: G01S17/93
Filed: 2020-04-27
Abstract: Provided in the embodiments of the present application are an obstacle avoidance method, a moveable platform, a control device, and a storage medium. The method comprises: a moveable platform controlling the rotation of a radar configured on the moveable platform, and the radar being able to collect point cloud data during the rotation; at this time, a control device acquiring omnidirectional point cloud data corresponding to the operating environment of the moveable platform; then, according to the omnidirectional point cloud data, determining whether there is an obstacle in the operating environment of the moveable platform; and if there is an obstacle, controlling the moveable platform to avoid the obstacle. It can be seen that in the obstacle avoidance method, a movable platform can realize an omnidirectional obstacle avoidance function thereof using point cloud data collected by a radar, thereby avoiding a poor obstacle avoidance effect caused by mutual interference between multiple obstacle avoidance sensors while ensuring the obstacle avoidance effect, and greatly reducing the risk of damaging the movable platform.
Patent WO-2021189591-A1 (WO)
Inventor: YANG SIQIANG
IPC: B60P3/36
Filed: 2020-04-27
Abstract: An easy-to-move foldable cabin and a use method therefor, the easy-to-move foldable cabin comprising: a housing (1), a foldable ceiling (3) mounted at the top of the housing (1), and a moving assembly mounted at the bottom of the housing (1) and used for driving the housing (1) to move. The foldable ceiling (3) comprises: a base plate (301) fixed to the top of the housing (1), a hinge assembly mounted on the base plate (301) and located at the same side as an extension platform (2), a rotatory plate (302) in a transmission connection with the hinge assembly, a number n of ceiling joists (303) arranged between the base plate (301) and the rotatory plate (302) and hinged to the hinge assembly, and an air bag (304).