Sealing device for elevator car

Abstract

The invention relates to the technical field of sealing devices, in particular to a sealing device for an elevator car, which comprises a car body and a door head assembly arranged on the front side of the car body and used for controlling sliding opening and closing of a left car door and a right car door, two guide rails which are symmetrical up and down are fixedly installed on the front side of the lift car body, the car door is installed between the two guide rails in a sliding mode, and a sealing unit used for conducting integrated sealing on the top, the bottom, the butt joint side and the rear side of the car door is arranged on the outer side of the car door. Integrated sealing of the top, the bottom, the butt joint side and the rear side of the car door is achieved, and compared with a traditional sealing mode, the omnibearing sealing design can more effectively prevent dust, noise, moisture and other external substances from entering the car.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing devices, and more particularly to a sealing device for an elevator car. Background Art

[0002] The elevator car is a box-shaped structure used to transport people or goods in the elevator system. It is usually composed of a car door and a car body consisting of a car frame, car wall, car bottom, and car roof. The car body is the load-bearing structure of the car and provides a foundation for the installation of other components. The car door is divided into a floor door and a car door. The floor door is installed at the entrance and exit of each floor, and the car door is installed on the car. The two cooperate to control the entry and exit of people and goods. During the operation of the elevator, the elevator car needs to move up and down in the hoistway to provide a safe and comfortable transportation environment for passengers or goods.

[0003] The elevator car sealing device is installed on the elevator car to improve the sealing performance of the car. Most elevator car doors use rubber strips as sealing devices. Such rubber strips are generally installed on the butt side edges of the car door. Through the elasticity of the rubber itself, it squeezes and contacts with the door frame when the car door is closed, thereby achieving sealing. Some elevator car doors also use brushes as sealing components. The brushes are installed on the car door or door frame. When the car door is closed, the brushes contact the corresponding parts and use the close arrangement of the bristles to block dust and airflow. However, these sealing methods still have certain defects: 1. Rubber The rubber strip seal only relies on the rubber strip to squeeze and contact the door frame at the edge of the car door, and can only seal the docking side of the car door. The sealing effect on the top, bottom, docking side and rear side of the car door is limited. At the same time, after the rubber strip ages and wears, the sealing performance drops sharply, and foreign dust, noise and moisture can easily enter the car, thereby disturbing passengers and reducing riding comfort. Although the brush seal has a certain filtering effect on dust, it cannot effectively isolate noise and block moisture. When the airflow is large, foreign matter is more likely to enter the car through the brush gap, which also affects the environment and equipment operation in the car.

[0004] 2. Rubber strip seals and brush seals are usually installed directly on the outside of the edge of the car door, which not only takes up extra space, but also is completely exposed to the external environment and is susceptible to daily collisions and scratches. During frequent elevator use, they may be damaged by passengers or carried items. At the same time, they are exposed to dust, water vapor and other environments for a long time, and the rubber strips are prone to aging and the brushes are prone to absorbing dust, which accelerates the damage of components and the decline of performance. In addition, the exposed sealing structure makes the surface of the car door uneven, which destroys the overall aesthetics of the car.

[0005] 3. Neither rubber strip seals nor brush seals have the function of automatically triggering operation. Their sealing effect depends entirely on the squeezing action when the car door is closed. In actual use, due to the uneven force and speed when the car door is closed, the degree of squeezing of the rubber strip or brush may be inconsistent, affecting the sealing effect. Summary of the invention

[0006] The present invention provides a sealing device for an elevator car to solve the above technical problems.

[0007] The present invention provides a sealing device for an elevator car, comprising a car body and a door head assembly arranged on the front side of the car body and used to control the sliding switches of two left and right car doors, the car door is formed by splicing two front and rear panels and is hollow inside, two guide rails symmetrical up and down are fixedly installed on the front side of the car body, the car door is slidably installed between the two guide rails, a sealing unit for integrated sealing of the top, bottom, docking side and rear side of the car door is arranged on the outside of the car door, and a driving unit for controlling the sealing unit to perform sealing operations is arranged inside the car door.

[0008] The sealing unit comprises a sealing assembly, a U-shaped limiting groove formed by splicing two panels and located outside the car door, and a strip groove opened at the rear side of the car door.

[0009] The sealing assembly includes two horizontal side sealing strips that are symmetrical to each other and are installed in the two horizontal sections of the limit groove for sliding up and down. A docking side sealing strip is installed for sliding left and right in the vertical section of the limit groove. A rear side sealing strip is installed for sliding front and back in the strip groove. A positioning groove is provided on the side of the guide rail close to the car door for sealing and positioning the horizontal side sealing strips.

[0010] Furthermore, two reinforcing ribs are fixedly installed vertically and symmetrically in the left and right directions in the car door, and the driving unit includes a driving assembly, a gear assembly and an extrusion assembly. The driving assembly, the gear assembly and the extrusion assembly are all provided with two symmetrical upper and lower sealing strips, which are used to drive the docking side sealing strip, the horizontal side sealing strip and the rear side sealing strip respectively.

[0011] Furthermore, the extrusion assembly includes an installation groove opened in the car door and located on the front side of the strip groove, a horizontal side sealing strip is fixedly installed with an extrusion plate that slides through the inner wall of the installation groove near the side of the installation groove, and a rear side sealing strip is fixedly installed with a wedge block that cooperates with the extrusion plate near the side of the extrusion plate.

[0012] Furthermore, a second return spring is fixedly installed on the rear inner wall of the installation groove, and a guide rod is fixedly installed on the other end of the second return spring through a circular plate. The guide rod slides through the rear inner wall of the installation groove and is fixedly connected to the rear sealing strip.

[0013] Furthermore, the driving assembly includes a return spring fixedly installed on the inner wall of the car door away from the guide rail and a connecting fixing plate fixedly installed on the other end of the return spring, and two L-shaped driving plates symmetrically installed front and back are fixedly installed on the connecting fixing plate, and both L-shaped driving plates are slidably installed in the guide rail.

[0014] Furthermore, the docking side sealing strip is fixedly installed with two mounting plates that slide through the inner wall of the car door and are symmetrical front to back near the side of the car door, and the two mounting plates are jointly installed with an inclined plate near one end of the L-shaped driving plate. The inclined plate is fixedly installed with a return spring three fixedly connected to the inner wall of the car door near the side of the car door, and the L-shaped driving plate cooperates with the inclined plate near the side of the inclined plate.

[0015] Furthermore, the gear assembly includes a lifting plate fixedly installed on the L-shaped driving plate near the car door and sliding through the horizontal inner wall of the car door, a gear column is rotatably installed on the horizontal inner wall of the car door, and teeth meshing with the gear column are provided on the side of the lifting plate near the gear column, and a toothed plate is fixedly installed on the side of the horizontal sealing strip near the gear column, which slides through the horizontal inner wall of the car door and meshes with the gear column.

[0016] Furthermore, the inner wall at the bottom of the guide rail is provided with two trapezoidal slopes which are symmetrical front to back and correspond one to one with the two L-shaped driving plates, and a slope which matches the trapezoidal slope is provided on one side of the L-shaped driving plate close to the trapezoidal slope.

[0017] The beneficial effects of the present invention are: 1. In the present application, through the coordinated operation of the drive assembly, the gear assembly and the extrusion assembly, an integrated seal of the top, bottom, docking side and rear side of the car door is achieved. Compared with the traditional sealing method, this all-round sealing design can more effectively block dust, noise, moisture and other external substances from entering the car, providing passengers with a quieter, cleaner and more comfortable riding environment. At the same time, it can also protect the equipment in the car from the influence of adverse external environment and extend the service life of the equipment.

[0018] 2. In the present application, the sealing unit for integrated sealing of the top, bottom, docking side and rear side of the car door and the driving unit for controlling the sealing unit to perform sealing operations are installed inside and on the edge of the car door by utilizing the internal hollow structure of the car door and the edge of the car door. The internal space of the car door is fully utilized, the structure is compact, no extra space is occupied, the direct contact between components and the external environment is reduced, daily collisions and scratches are avoided, and the erosion of components by dust, water vapor, etc. is reduced, the wear and aging of components are delayed, thereby extending the service life of the sealing unit and the driving unit, and making the surface of the car door smoother and simpler, without abrupt external structures, thereby improving the overall aesthetics of the car.

[0019] 3. In the present application, the opening and closing action of the car door automatically triggers the operation of the sealing unit without the need for additional operation or power source, and the seals at the top, bottom, docking side, and rear side are driven by utilizing the L-shaped driving plate to extrude the trapezoidal slope, thereby realizing the linkage of multiple sealing parts, so that during the closing process of the car door, each sealing strip can perform a sealing action simultaneously or in order, greatly improving the efficiency and integrity of the sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0021] Figure 2 It is a partial three-dimensional structural schematic diagram of the door head assembly, car door, guide rail and sealing unit of the present invention.

[0022] Figure 3 It is a partial three-dimensional structural schematic diagram of the sealing unit and the driving unit of the present invention.

[0023] Figure 4 It is a schematic diagram of the three-dimensional structure of the limiting groove and the strip groove part of the present invention.

[0024] Figure 5 It is a schematic diagram of the three-dimensional structure of the L-shaped driving plate, the mounting plate, the reinforcing ribs and part of the L-shaped driving plate of the present invention.

[0025] Figure 6 The present invention Figure 5 A partial enlarged view of part A.

[0026] Figure 7 It is a sectional view of the three-dimensional structure of the mounting groove, the extrusion plate, the wedge block, the second return spring and the guide rod of the present invention.

[0027] Figure 8 It is a state diagram of the left side car door changing from open to closed according to the present invention.

[0028] Fig. 9 It is a state diagram of the right side car door changing from open to closed according to the present invention.

[0029] Fig.10 It is a diagram of the closed state of the left and right car doors of the present invention.

[0030] Fig.11 It is a schematic diagram of the three-dimensional structure of the positioning groove, trapezoidal slope and guide rail part of the present invention.

[0031] In the figure: 1, car body; 2, door head assembly; 3, car door; 4, guide rail; 5, sealing unit; 6, drive unit; 7, reinforcing rib; 501, limit groove; 502, sealing assembly; 503, strip groove; 504, positioning groove; 5021, horizontal side sealing strip; 5022, docking side sealing strip; 5023, rear side sealing strip; 601, drive assembly; 602, gear assembly; 603, extrusion assembly; 604, positioning groove; 605, horizontal side sealing strip; 606, horizontal side sealing strip; 607, horizontal side sealing strip; 608, horizontal side sealing strip; 609, horizontal side sealing strip; 610, horizontal side sealing strip; 611, horizontal side sealing strip; 612, horizontal side sealing strip; 613, horizontal side sealing strip; 614, horizontal side sealing strip; 615, horizontal side sealing strip; 616, horizontal side sealing strip; 617, horizontal side sealing strip; 618, horizontal side sealing strip; 619, horizontal side sealing strip; 620, horizontal side sealing strip; 621, horizontal side sealing strip; 622, horizontal side sealing strip; 623, horizontal side sealing strip; 624, horizontal side sealing strip; 625, horizontal side sealing strip; 626, horizontal side sealing strip; 627, horizontal side sealing strip; 628, horizontal side sealing strip; 629, horizontal side sealing strip; 630, horizontal side sealing strip; 631, horizontal side sealing strip; 632, horizontal side sealing strip; 633, horizontal side sealing strip; 634, horizontal side sealing strip; 635, horizontal side sealing strip; 636, horizontal side sealing strip; 637, horizontal side sealing strip; 638, horizontal side sealing strip; 639, horizontal side sealing strip; 640, horizontal side sealing strip; 011, reset spring one; 6012, connecting fixing plate; 6013, L-shaped driving plate; 6014, mounting plate; 6015, inclined plate; 6016, trapezoidal slope; 6017, reset spring three; 6021, lifting plate; 6022, gear column; 6023, tooth plate; 6031, mounting groove; 6032, extrusion plate; 6033, wedge block; 6034, reset spring two; 6035, guide rod. DETAILED DESCRIPTION

[0032] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that the discussion of these embodiments is to enable those skilled in the art to better understand and implement the subject matter described herein. The functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the present specification. Various examples may omit, replace or add various processes or components as needed. In addition, the features described relative to some examples may also be combined in other examples.

[0033] See also Figure 1 , Figure 2 and Figure 5 In this embodiment, a sealing device for an elevator car is proposed, including a car body 1 and a door head assembly 2 arranged at the front side of the car body 1 and used to control the sliding switch of two left and right car doors 3. The car door 3 is spliced ​​by two front and rear panels and is hollow inside. Two vertically arranged and left-right symmetrical reinforcing ribs 7 are fixedly installed in the car door 3. The two reinforcing ribs 7 enhance the structural strength of the car door 3. Two upper and lower symmetrical guide rails 4 are fixedly installed on the front side of the car body 1. The car door 3 is slidably installed between the two guide rails 4. A sealing unit 5 for integrated sealing of the top, bottom, docking side and rear side of the car door 3 is arranged on the outside of the car door 3. A driving unit 6 for controlling the sealing unit 5 to perform sealing operation is arranged in the car door 3.

[0034] See also Figure 2 , Figure 3 , Figure 4 , Figure 5 , Fig. 9 and Fig.11The sealing unit 5 includes a sealing component 502, a limiting groove 501 formed by splicing two panels and located on the outside of the car door 3 and in a U shape, and a strip groove 503 opened on the rear side of the car door 3. The sealing component 502 includes two horizontal side sealing strips 5021 that are symmetrically installed in the two horizontal sections of the limiting groove 501 for upward and downward sliding, a docking side sealing strip 5022 is slidably installed in the vertical section of the limiting groove 501, and a rear side sealing strip 5023 is slidably installed in the strip groove 503 for front and rear sliding. A positioning groove 504 is opened on the side of the guide rail 4 close to the car door 3 for sealing and positioning the horizontal side sealing strip 5021.

[0035] It should be noted that the horizontal side sealing strip 5021, the docking side sealing strip 5022 and the rear side sealing strip 5023 are all designed with an inner frame and an outer silicone rubber cover. Due to its excellent elastic properties, the silicone rubber can quickly and tightly fit the surrounding structure when the car door 3 is closed, effectively filling the tiny gaps between the car door 3 and the surrounding structures such as the car body 1 and the guide rail 4, ensuring that dust, noise and airflow cannot enter seamlessly. In addition, the extremely low friction coefficient of silicone rubber ensures that the sealing performance is guaranteed without hindering the normal opening and closing of the car door 3. When the car door 3 is opened or closed, the friction between the sealing strip and the surrounding structure is controlled within a very small range, reducing the loss to the drive system and extending the service life of related components.

[0036] The design of the internal skeleton enhances the overall strength and shape stability of the sealing strip, making it less likely to deform or be damaged when subjected to external forces such as extrusion and stretching. This allows the sealing strip to better maintain its shape and ensure the reliability of the seal, while also facilitating installation and fixation.

[0037] See also Figure 3 , Figure 6 , Figure 7 , Figure 8 and Fig. 9 The driving unit 6 includes a driving component 601, a gear component 602 and an extrusion component 603. The driving component 601, the gear component 602 and the extrusion component 603 are each provided with two upper and lower symmetrical components, which are respectively used to drive the docking side sealing strip 5022, the horizontal side sealing strip 5021 and the rear side sealing strip 5023.

[0038] See also Figure 3 , Figure 6 , Figure 8 and Fig. 9 The driving assembly 601 includes a return spring 6011 fixedly installed on the inner wall of the car door 3 away from the guide rail 4 and a connecting fixing plate 6012 fixedly installed on the other end of the return spring 6011, and two front-to-back symmetrical L-shaped driving plates 6013 are fixedly installed on the connecting fixing plate 6012, and the two L-shaped driving plates 6013 are both slidably installed in the guide rail 4.

[0039] It should be noted that the guide rail 4 provides a precise guide for the sliding opening and closing of the car door 3. During the opening and closing process of the car door 3, the L-shaped driving plate 6013 slides along the guide rail 4, which can ensure the accuracy of its motion trajectory and prevent the car door 3 from deflecting or shaking, thereby preventing the sealing performance of the sealing unit 5 from being affected by the shaking of the car door 3.

[0040] See also Figure 8 and Fig.11 The inner wall at the bottom of the guide rail 4 is provided with two trapezoidal slopes 6016 which are symmetrical front and back and correspond one to one with the two L-shaped driving plates 6013 , and a slope matching the trapezoidal slope 6016 is provided on the side of the L-shaped driving plate 6013 close to the trapezoidal slope 6016 .

[0041] See also Figure 6 , Figure 7 and Figure 8 The docking side sealing strip 5022 is fixedly installed with two mounting plates 6014 that slide through the inner wall of the car door 3 and are symmetrical front and back near the side of the car door 3. The two mounting plates 6014 are jointly installed with an inclined plate 6015 near one end of the L-shaped driving plate 6013. The inclined plate 6015 is fixedly installed with a return spring three 6017 fixedly connected to the inner wall of the car door 3 near the side of the inner wall of the car door 3. The L-shaped driving plate 6013 is matched with the inclined plate 6015 near the side of the inclined plate 6015.

[0042] See also Figure 6 , Figure 8 , Fig. 9 and Fig.11When the elevator car door 3 starts to close, the door head assembly 2 controls the car door 3 to slide along the guide rail 4. During the movement of the car door 3, the driving assembly 601 installed therein is driven to move. Since a return spring 6011 is fixedly installed on the inner wall of the car door 3 away from the guide rail 4, the L-shaped driving plate 6013 connected to the connecting fixing plate 6012 at the other end thereof will slide in the guide rail 4 as the car door 3 moves. The trapezoidal slope 6016 of the inner wall at the bottom of the guide rail 4 cooperates with the L-shaped driving plate 6013, so that the L-shaped driving plate 6013 moves horizontally along the guide rail 4 while moving toward the center of the car door 3. The movement of the L-shaped driving plate 6013 squeezes and pushes the inclined plate 6015 on the mounting plate 6014 of the mating side sealing strip 5022 (the inclined plates 6015 on the left and right sides have the same inclination direction, so after being squeezed, the inclined plate 6015 on the left moves to the left, and the inclined plate 6015 on the right also moves to the left. That is to say, the two inclined plates 6015 move in the same direction and apply force to the corresponding return spring three 6017 at the same time. After the inclined plate 6015 is subjected to force, it drives the docking side sealing strip 5022 to move in the vertical section of the limiting groove 501. The docking side sealing strip 5022 on the left side moves close to the left side of the car door 3 and retracts into the limiting groove 501. The docking side sealing strip 5022 on the right side moves to the side close to the left car door 3, and is inserted into the space vacated after the docking side sealing strip 5022 retracts into the limiting groove 501, and then is inserted into the limiting groove 501 of the left car door 3, thereby realizing the sealing of the docking side. The docking side sealing strips 5022 are plugged into each other to fit more closely to the docking part of the car door, which greatly increases the contact area of ​​the seal, significantly improves the sealing effect, prevents dust, noise, etc. from entering the car from the docking part, and also avoids the problem that the docking side sealing strip 5022 is exposed to the outside and is easily affected by daily collisions and scratches.

[0043] When the car door 3 is opened, as the L-shaped driving plate 6013 separates from the trapezoidal slope 6016, the return spring 1 6011 starts to play a role. The return spring 1 6011 will generate a pulling force on the connecting and fixing plate 6012, so that the connecting and fixing plate 6012 drives the L-shaped driving plate 6013 to move away from the center of the car door 3. The reverse movement of the L-shaped driving plate 6013 causes it to be out of the squeezed state with the inclined plate 6015. After the L-shaped driving plate 6013 no longer applies a thrust to the inclined plate 6015, the return spring 3 6017 is reset, driving the docking side sealing strip 5022 to move and reset along the vertical section of the limiting groove 501, thereby preparing for the sealing action when the car door 3 is closed next time.

[0044] See also Figure 6 , Figure 8 , Fig. 9 and Fig.10The gear assembly 602 includes a lifting plate 6021 fixedly mounted on the L-shaped driving plate 6013 near the car door 3 and slidingly penetrating the inner wall of the horizontal side of the car door 3; a gear column 6022 is rotatably mounted on the inner wall of the horizontal side of the car door 3; teeth meshing with the gear column 6022 are provided on the lifting plate 6021 near the gear column 6022; a tooth plate 6023 is fixedly mounted on the horizontal side sealing strip 5021 near the gear column 6022 and slides through the inner wall of the horizontal side of the car door 3 and meshing with the gear column 6022.

[0045] See also Figure 6 , Figure 8 and Fig. 9 When the car door 3 is closed, the movement of the L-shaped driving plate 6013 drives the lifting plate 6021 to move synchronously. When the lifting plate 6021 moves up and down, its teeth interact with the gear column 6022. Specifically, when the upper L-shaped driving plate 6013 slides down, the lifting plate 6021 connected thereto also moves downward, and the upper gear column 6022 is pushed to rotate through the upper teeth; when the lower L-shaped driving plate 6013 moves up, it drives the corresponding lifting plate 6021 to move upward, and similarly the lower gear column 6022 is rotated through the lower teeth.

[0046] The gear column 6022 is driven by the lifting plate 6021 to rotate continuously, thereby driving the gear plate 6023 and the horizontal side sealing strip 5021 connected thereto to move. As a result, the upper and lower horizontal side sealing strips 5021 move away from each other and are finally inserted into the positioning grooves 504 provided on the upper and lower guide rails 4 near the car door 3, respectively, to achieve sealing of the top and bottom of the car door 3.

[0047] When the car door 3 is opened, the L-shaped driving plate 6013 moves in the opposite direction, driving the lifting plate 6021 to move in the opposite direction, and the gear column 6022 reverses accordingly, so that the horizontal side sealing strip 5021 withdraws from the positioning groove 504 and returns to the initial position, preparing for the sealing when the car door 3 is closed next time.

[0048] See also Figure 3 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Fig. 9 The extrusion assembly 603 includes a mounting groove 6031 which is opened in the car door 3 and located in front of the strip groove 503. A horizontal side sealing strip 5021 is fixedly installed with an extrusion plate 6032 which slides through the inner wall of the mounting groove 6031 on one side close to the mounting groove 6031. A rear side sealing strip 5023 is fixedly installed with a wedge block 6033 which matches the extrusion plate 6032 on one side close to the extrusion plate 6032.

[0049] See also Figure 7 , Figure 8 and Fig. 9 A second return spring 6034 is fixedly installed on the inner wall of the rear side of the mounting groove 6031, and a guide rod 6035 is fixedly installed on the other end of the second return spring 6034 through a circular plate. The guide rod 6035 slides through the inner wall of the rear side of the mounting groove 6031 and is fixedly connected to the rear sealing strip 5023. The guide rod 6035 guides the movement of the rear sealing strip 5023.

[0050] Figure 7 , Figure 8 and Fig. 9 During the closing process of the elevator door 3, the horizontal side sealing strip 5021 will slide up and down in the horizontal section of the limiting groove 501 under the drive of the gear assembly 602, and the up and down movement of the horizontal side sealing strip 5021 will drive the extrusion plate 6032 to move synchronously.

[0051] When the extrusion plate 6032 moves with the horizontal side sealing strip 5021, it will gradually approach the wedge block 6033 on the rear side sealing strip 5023. As the distance between the two continues to decrease, the extrusion plate 6032 will squeeze the wedge block 6033. Under the extrusion force of the extrusion plate 6032, the wedge block 6033 drives the rear side sealing strip 5023 to slide backward in the strip groove 503, so that the rear side sealing strip 5023 is close to the car body 1 (there is a small gap between the car body 1 and the car door 3 to avoid close contact that hinders the opening and closing of the car door 3), thereby achieving sealing of the rear side of the car door 3.

[0052] When the elevator car door 3 is opened, the horizontal side sealing strip 5021 moves in the opposite direction, and the extrusion plate 6032 moves away from the wedge block 6033, and the extrusion force on the wedge block 6033 disappears. At this time, the return spring 2 6034 on the inner wall of the rear side of the installation groove 6031 plays a role, pushing the circular plate connected to it, and the circular plate drives the guide rod 6035 to slide forward, driving the rear side sealing strip 5023 to slide forward along the strip groove 503 and return to the initial position, preparing for the sealing when the car door 3 is closed next time.

[0053] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. A sealing device for an elevator car, comprising: A car body and a door head assembly arranged at the front side of the car body and used to control the sliding switch of the left and right car doors, characterized in that the car door is formed by splicing two front and rear panels and is hollow inside, two guide rails symmetrical up and down are fixedly installed on the front side of the car body, and the car door is slidably installed between the two guide rails, and a sealing unit for integrated sealing of the top, bottom, docking side and rear side of the car door is arranged on the outside of the car door, and a driving unit for controlling the sealing unit to perform sealing operations is arranged inside the car door; The sealing unit comprises a sealing assembly, a U-shaped limiting groove formed by splicing two panels and located outside the car door, and a strip groove opened on the rear side of the car door; The sealing assembly includes two horizontal side sealing strips that are symmetrical to each other and are installed in the two horizontal sections of the limit groove for sliding up and down. A docking side sealing strip is installed for sliding left and right in the vertical section of the limit groove. A rear side sealing strip is installed for sliding front and back in the strip groove. A positioning groove is provided on the side of the guide rail close to the car door for sealing and positioning the horizontal side sealing strips.

2. A sealing device for an elevator car according to claim 1, characterized in that: Two vertically arranged and left-right symmetrical reinforcing ribs are fixedly installed in the car door, and the driving unit includes a driving assembly, a gear assembly and an extrusion assembly. The driving assembly, the gear assembly and the extrusion assembly are all provided with two upper and lower symmetrical sealing strips, which are used to drive the docking side sealing strip, the horizontal side sealing strip and the rear side sealing strip respectively.

3. A sealing device for an elevator car according to claim 2, characterized in that: The extrusion assembly includes an installation groove opened in the car door and located on the front side of the strip groove, a horizontal side sealing strip is fixedly installed with an extrusion plate that slides through the inner wall of the installation groove near the side of the installation groove, and a rear side sealing strip is fixedly installed with a wedge block that matches the extrusion plate near the side of the extrusion plate.

4. A sealing device for an elevator car according to claim 3, characterized in that: A second return spring is fixedly installed on the inner wall at the rear side of the installation groove, and a guide rod is fixedly installed on the other end of the second return spring through a circular plate. The guide rod slides through the inner wall at the rear side of the installation groove and is fixedly connected to the rear sealing strip.

5. A sealing device for an elevator car according to claim 2, characterized in that: The driving assembly includes a return spring fixedly installed on the inner wall of the car door away from the guide rail and a connecting fixing plate fixedly installed on the other end of the return spring. Two L-shaped driving plates symmetrically installed front and back are fixedly installed on the connecting fixing plate. Both L-shaped driving plates are slidably installed in the guide rail.

6. A sealing device for an elevator car according to claim 5, characterized in that: The butt-side sealing strip is fixedly installed with two mounting plates that slide through the inner wall of the car door and are symmetrical front to back on the side close to the car door. The two mounting plates are jointly installed with an inclined plate near one end of the L-shaped driving plate. The inclined plate is fixedly installed with a return spring three that is fixedly connected to the inner wall of the car door on the side close to the inner wall of the car door. The L-shaped driving plate cooperates with the inclined plate on the side close to the inclined plate.

7. A sealing device for an elevator car according to claim 5, characterized in that: The gear assembly includes a lifting plate fixedly installed on the side of the L-shaped driving plate close to the car door and slidingly passing through the inner wall of the horizontal side of the car door; a gear column is rotatably installed on the inner wall of the horizontal side of the car door; teeth meshing with the gear column are provided on the side of the lifting plate close to the gear column; a tooth plate sliding through the inner wall of the horizontal side of the car door and meshing with the gear column is fixedly installed on the side of the horizontal side sealing strip close to the gear column.

8. A sealing device for an elevator car according to claim 5, characterized in that: The inner wall at the bottom of the guide rail is provided with two trapezoidal slopes which are symmetrical front to back and correspond to the two L-shaped driving plates one by one, and a slope matching the trapezoidal slope is provided on one side of the L-shaped driving plate close to the trapezoidal slope.

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