A car door device for a mine elevator
By using a flexible air column, pressure sensor, and pressure plate in the anti-pinch mechanism of the underground mining elevator car door, the problem of the underground mining elevator car door being easily affected by dust has been solved, and the anti-pinch function that is not affected by dust has been achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUBEI ELEVATOR FACTORY
- Filing Date
- 2025-07-31
- Publication Date
- 2026-05-29
AI Technical Summary
The anti-pinch function of the elevator car door in underground mines is easily affected by dust, causing it to malfunction.
The anti-pinch mechanism, which uses a flexible inflatable column, pressure sensor and pressure plate, determines whether the car door is pinching a foreign object by detecting changes in air pressure inside the flexible inflatable column, thus achieving the anti-pinch function.
This avoids the failure of the anti-pinch function of the car door due to dust, ensuring the normal operation of the car door of the underground mining elevator.
Smart Images
Figure CN224298665U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of elevator technology, specifically a car door device suitable for underground mining elevators. Background Technology
[0002] For a long time, miners have relied on cages or hoists to ascend and descend vertically into the mine. In recent years, mine elevators, as an important auxiliary device for hoisting underground personnel, have gradually gained attention.
[0003] Currently, existing elevator car door anti-pinch devices mostly use infrared sensors or light curtain sensors for detection. However, in the underground environment, there is a lot of dust, and infrared sensors or light curtain sensors are easily blocked by dust, making it difficult for the anti-pinch function of the car door to work properly.
[0004] Chinese utility model patent CN204508529U discloses an elevator anti-pinch device, including an elevator car, an elevator door, and a landing door corresponding to the elevator door; the top of the elevator car is provided with a sensor for detecting the area between the elevator doors; the landing door is provided with a grating; it also includes a limit switch, which includes a limit block provided on the elevator door and a fixing block provided on the landing door. The limit block and the fixing block are inductively connected. When the elevator door is closed, the limit block and the fixing block are inductively engaged, and the landing door is driven to close. When the landing door moves, the grating is blocked by an obstacle, the landing door stops closing and the elevator door opens.
[0005] The elevator car doors of this type of elevator use gratings in conjunction with sensors. However, in dusty environments, they are still easily affected by dust, which can cause the anti-pinch function of the car doors to malfunction. Utility Model Content
[0006] The purpose of this invention is to provide a car door device suitable for underground mining elevators, so as to solve at least one of the above-mentioned technical problems.
[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0008] A car door device suitable for underground mining elevators, comprising:
[0009] The door panel mechanism includes a first fixed panel, a second fixed panel, a first movable panel, and a second movable panel. The first fixed panel has a first storage slot for receiving the first movable panel, and the second fixed panel has a second storage slot for receiving the second movable panel. The first fixed panel, second fixed panel, first movable panel, and second movable panel form the main body of the car door device. When the first movable panel and the second movable panel approach each other until they abut, the car door closes. When the first movable panel and the second movable panel move away from each other, the car door opens. At this time, the first movable panel gradually moves into the first storage slot, and the second movable panel gradually moves into the second storage slot. The shape of the first storage slot matches the shape of the first movable panel, and the shape of the second storage slot matches the shape of the second movable panel. The first and second storage slots can also restrict the movement direction of the first and second movable panels, causing them to move along the same straight line.
[0010] A drive mechanism is connected to both the first movable fan and the second movable fan to drive the first movable fan and the second movable fan to move; specifically, the drive mechanism can drive the first movable fan and the second movable fan to move closer to each other or further away from each other;
[0011] The anti-pinch mechanism includes a flexible inflatable column, a pressure sensor, and a pressure plate. Both the first and second movable fans have abutment surfaces. The tops of both the first and second movable fans have vertically oriented mounting holes, located near their corresponding abutment surfaces. The flexible inflatable column and the pressure sensor are installed within the mounting holes. The pressure input end of the pressure sensor communicates with the flexible inflatable column to detect its pressure. The abutment surface has a mounting groove whose shape matches the pressure plate, communicating with its corresponding mounting hole. The pressure plate is installed within the mounting groove, with one side of the pressure plate abutting and connecting to its corresponding flexible inflatable column. The abutment surface has a first receiving groove for accommodating the pressure plate. The mounting holes are used to install the flexible inflatable column and the pressure sensor, while the mounting grooves are used to install the pressure plate and restrict its movement direction.
[0012] This invention utilizes a flexible inflatable column, a pressure sensor, and a pressure plate in conjunction to achieve the anti-pinch function of the car door. When the car door traps a foreign object—that is, when the first and second movable panels approach each other and trap the object—the pressure plate is squeezed by the object. The pressure plate, in turn, squeezes the flexible inflatable column, increasing the air pressure inside. The pressure sensor can detect the pressure change inside the flexible inflatable column caused by the foreign object, thus indicating that the car door has trapped a foreign object. This achieves the anti-pinch function of the car door. This function does not rely on light curtains or photoelectric sensors and is unaffected by dust, avoiding the problem of the anti-pinch function of the car door not working properly due to the high dust levels in mines.
[0013] Furthermore, the drive mechanism includes a first mounting plate, a second mounting plate, a bidirectional lead screw, and a first drive motor. The first and second mounting plates are parallel to each other and vertically arranged. The two ends of the bidirectional lead screw are rotatably connected to the first and second mounting plates, respectively. The first drive motor is mounted on the first mounting plate and is drively connected to the bidirectional lead screw. The bidirectional lead screw has two threaded sections with opposite directions of rotation. Each threaded section is threaded with a slider. The two sliders are fixedly connected to the first movable fan and the second movable fan, respectively, so that the drive mechanism drives the first and second movable fans to move. The first and second mounting plates are used to mount the bidirectional lead screw and the first drive motor. The first and second movable fans can only move along the same straight line under the restriction of the second storage slot of the first storage slot. The two sliders are fixedly connected to the first and second movable fans respectively, so the two sliders can only slide along the same straight line. The sliders cooperate with the first drive motor and the bidirectional lead screw. The first drive motor can drive the bidirectional lead screw to rotate, thereby causing the two sliders to move closer or further away from each other, and thus causing the first and second movable fans to move further or closer to each other, so as to realize the drive mechanism to drive the first and second movable fans to move.
[0014] Furthermore, a guide rod is provided between the first mounting plate and the second mounting plate. The length direction of the guide rod is consistent with the length direction of the bidirectional lead screw. The guide rod passes through the two sliders and is slidably connected to the two sliders. By using the guide rod to guide the two sliders, the stability of the slider movement can be further improved, thereby enhancing the stability of the first and second movable fans.
[0015] Furthermore, a second drive motor is provided on the second mounting plate. The second drive motor is connected to the bidirectional lead screw transmission so that the first drive motor and the second drive motor jointly drive the bidirectional lead screw to rotate. By providing the second drive motor to also drive the bidirectional lead screw to rotate, the installation redundancy of this device is improved. When the first drive motor fails and cannot drive the second drive motor to rotate, the second drive motor can take over from the first drive motor and continue to drive the bidirectional lead screw to rotate.
[0016] Furthermore, the first drive motor, the second drive motor, and the bidirectional lead screw are coaxially arranged, the output shaft of the first drive motor is coaxially and fixedly connected to the end of the bidirectional lead screw, and the output shaft of the second drive motor is coaxially and fixedly connected to the other end of the bidirectional lead screw.
[0017] Furthermore, the top and bottom of the pressure plate both protrude to form extension portions on the side away from their corresponding flexible inflatable columns. The extension portion at the top of the pressure plate is flush with the top of the first movable fan, and the extension portion at the bottom of the pressure plate is flush with the top and bottom of the first movable fan. The top of the first movable fan is flush with the top of the second movable fan, and the bottom of the first movable fan is flush with the bottom of the second movable fan. The top and bottom of the mounting groove both have a second receiving groove for accommodating the extension portions on the side away from their corresponding flexible inflatable columns. The extension portions enable the car door to have an anti-pinch function from top to bottom. That is, as long as a foreign object is located between the first and second movable fans and is pinched, it can be detected by the pressure sensor.
[0018] Furthermore, a cover is provided on the top of the mounting hole to reduce dust from entering the mounting hole.
[0019] Furthermore, the flexible inflatable column includes an upper cover, a lower cover, and a flexible cylinder. The upper cover is sealed and fixed to the top opening of the flexible cylinder, and the lower cover is sealed and fixed to the bottom opening of the flexible cylinder. Both the upper cover and the lower cover are fixed to the mounting hole. The upper cover and the lower cover facilitate the fixed connection between the flexible inflatable column and the mounting hole. The flexible cylinder facilitates the compression of the pressure plate, causing changes in the pressure inside the flexible inflatable column.
[0020] Furthermore, the first fixed fan, the second fixed fan, the first movable fan, and the second movable fan are all arranged vertically and parallel to each other.
[0021] Furthermore, it also includes a lower guide rail, to which the bottoms of the first movable fan and the second movable fan are slidably connected. The lower guide rail is used to improve the stability of the movement of the first movable fan and the second movable fan.
[0022] Compared with the prior art, the beneficial effects of this utility model are:
[0023] This invention utilizes a flexible inflatable column, a pressure sensor, and a pressure plate in conjunction to achieve the anti-pinch function of the car door. When the car door traps a foreign object—that is, when the first and second movable panels approach each other and trap the object—the pressure plate is squeezed by the object. The pressure plate, in turn, squeezes the flexible inflatable column, increasing the air pressure inside. The pressure sensor can detect the pressure change inside the flexible inflatable column caused by the foreign object, thus indicating that the car door has trapped a foreign object. This achieves the anti-pinch function of the car door. This function does not rely on light curtains or photoelectric sensors and is unaffected by dust, avoiding the problem of the anti-pinch function of the car door not working properly due to the high dust levels in mines. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of a car door device structure suitable for underground mining elevators in this embodiment;
[0025] Figure 2 for Figure 1 Enlarged view of a portion of point A in the middle;
[0026] Figure 3 This is a cross-sectional view of the flexible air column on the first movable fan in this embodiment;
[0027] In the diagram: 1. First fixed fan; 2. Second fixed fan; 3. First movable fan; 4. Second movable fan; 5. First storage slot; 6. Second storage slot; 7. Pressure sensor; 8. Pressure plate; 9. Mounting hole; 10. Mounting slot; 11. First receiving slot; 12. First mounting plate; 13. Second mounting plate; 14. Bidirectional lead screw; 15. First drive motor; 16. Slider; 17. Guide rod; 18. Second drive motor; 19. Extension part; 20. Second receiving slot; 21. Cover; 22. Upper cover; 23. Lower cover; 24. Flexible cylinder; 25. Lower guide rail. Detailed Implementation
[0028] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0029] like Figure 1-3 As shown, this embodiment provides a car door device suitable for underground mining elevators, including:
[0030] The door mechanism includes a first fixed fan 1, a second fixed fan 2, a first movable fan 3, and a second movable fan 4. The first fixed fan 1 has a first storage groove 5 for receiving the first movable fan 3, and the second fixed fan 2 has a second storage groove 6 for receiving the second movable fan 4. The first fixed fan 1, the second fixed fan 2, the first movable fan 3, and the second movable fan 4 form the main body of the car door device. When the first movable fan 3 and the second movable fan 4 approach each other until they abut, the car door is closed. When the first movable fan 3 and the second movable fan 4 move away from each other, the car door is opened. At this time, the first movable fan 3 gradually moves into the first storage groove 5, and the second movable fan 4 gradually moves into the second storage groove 6. The shape of the first storage groove 5 matches the shape of the first movable fan 3, and the shape of the second storage groove 6 matches the shape of the second movable fan 4. The first storage groove 5 and the second storage groove 6 can also restrict the movement direction of the first movable fan 3 and the second movable fan 4, so that the first movable fan 3 and the second movable fan 4 move in the same straight line direction.
[0031] A drive mechanism is connected to both the first movable fan 3 and the second movable fan 4 to drive the first movable fan 3 and the second movable fan 4 to move; specifically, the drive mechanism can drive the first movable fan 3 and the second movable fan 4 to move closer to each other or further away from each other;
[0032] The anti-pinch mechanism includes a flexible inflatable column, a pressure sensor 7, and a pressure plate 8. Both the first movable fan 3 and the second movable fan 4 have abutment surfaces. The tops of both the first movable fan 3 and the second movable fan 4 have vertically oriented mounting holes 9. These mounting holes 9 are positioned close to their corresponding abutment surfaces. The flexible inflatable column and the pressure sensor 7 are installed within the mounting holes 9. The pressure input end of the pressure sensor 7 communicates with the flexible inflatable column to detect its pressure. The abutment surfaces have mounting grooves 10 whose shape matches the pressure plate 8. These mounting grooves 10 communicate with their corresponding mounting holes 9. The pressure plate 8 is installed... The pressure plate 8 is installed in the mounting groove 10, with one side abutting and connecting to the corresponding flexible inflatable column. A first receiving groove 11 is provided on the abutting surface to accommodate the pressure plate 8. The mounting hole 9 is used to install the flexible inflatable column and pressure sensor 7, and the mounting groove 10 is used to install the pressure plate 8 and restrict its movement direction. For example, the mounting groove 10 of the pressure plate 8 installed on the first movable fan 3 restricts the pressure plate 8 to move only towards or away from the second movable fan 4. When not compressed by foreign objects, a portion of the pressure plate 8 extends out of its corresponding mounting groove 10; when compressed by foreign objects, the pressure plate 8 moves away from... The second movable fan 4 moves in the direction of the pressure plate 8, compressing the flexible inflatable column located inside the first movable fan 3. When the foreign object stops compressing and detaches from the pressure plate 8, the pressure plate 8, under the action of the flexible inflatable column, moves towards the second movable fan 4. The corresponding mounting groove 10 of the pressure plate 8 installed on the second movable fan 4 restricts the pressure plate 8 to move only towards or away from the first movable fan 3. When not compressed by a foreign object, part of the pressure plate 8 extends out of its corresponding mounting groove 10. When compressed by a foreign object, the pressure plate 8 moves away from the first movable fan 3 and compresses the flexible inflatable column located inside the second movable fan 4. When the foreign object stops compressing and detaches from the pressure plate 8, the pressure plate 8 moves towards the second movable fan 4. After contact with the pressure plate 8, the pressure plate 8 moves towards the first movable fan 3 under the action of the flexible air column; the first receiving groove 11 is provided to receive the pressure plate 8. Specifically, when the pressure plate 8 does not contact the foreign object, a part of the pressure plate 8 will extend out of its corresponding mounting groove 10. At this time, if the car door is closed, that is, the first movable fan 3 and the second movable fan 4 abut against each other, the pressure plate 8 on the first movable fan 3 will extend into the first receiving groove 11 on the second movable fan 4 and be received by the first receiving groove 11.
[0033] This invention utilizes a flexible inflatable column, a pressure sensor 7, and a pressure plate 8 in cooperation to achieve the anti-pinch function of the car door. When the car door traps a foreign object, that is, when the first movable fan 3 and the second movable fan 4 approach each other and trap the foreign object, the pressure plate 8 is squeezed by the foreign object. The pressure plate 8, squeezed by the foreign object, further squeezes the flexible inflatable column, causing the air pressure inside the flexible inflatable column to increase. The pressure sensor 7 can detect the air pressure change inside the flexible inflatable column caused by the foreign object, thus knowing that the car door has trapped a foreign object, thereby realizing the anti-pinch function of the car door. This function does not rely on light curtains or photoelectric sensors and is not affected by dust, thus avoiding the problem that the anti-pinch function of the car door cannot work properly due to the large amount of dust in the mine.
[0034] In this embodiment, the abutting surface of the first movable fan 3 is the side of the first movable fan 3 that is close to the second movable fan 4, and the abutting surface of the second movable fan 4 is the side of the second movable fan 4 that is close to the first movable fan 3. When the car door is closed, the first movable fan 3 and the second movable fan 4 abut against each other. At this time, the abutting surface of the first movable fan 3 abuts against the abutting surface of the second movable fan 4.
[0035] In this embodiment, the pressure plates 8 located on the first movable fan 3 and the second movable fan 4 are misaligned to prevent the two pressure plates 8 from interfering with each other.
[0036] Furthermore, the driving mechanism includes a first mounting plate 12, a second mounting plate 13, a bidirectional lead screw 14, and a first drive motor 15. The first mounting plate 12 and the second mounting plate 13 are parallel to each other and vertically arranged. The two ends of the bidirectional lead screw 14 are rotatably connected to the first mounting plate 12 and the second mounting plate 13, respectively. The first drive motor 15 is mounted on the first mounting plate 12 and is drively connected to the bidirectional lead screw 14. The bidirectional lead screw 14 has two threaded sections with opposite directions of rotation. Each of the two threaded sections is threaded with a slider 16. The two sliders 16 are fixedly connected to the first movable fan 3 and the second movable fan 4, respectively, so that the driving mechanism drives the first movable fan 3 and the second movable fan 4 to move. The first mounting plate 12 and the second mounting plate 13 are used to mount the bidirectional lead screw 14 and the first drive motor 15. The first movable fan 3 and the second movable fan 4 can only move along the same straight line direction under the restriction of the second storage slot 6 of the first storage slot 5. The two sliders 16 are fixedly connected to the first movable fan 3 and the second movable fan 4 respectively. Therefore, the two sliders 16 can only slide along the same straight line direction. The sliders 16 cooperate with the first drive motor 15 and the bidirectional lead screw 14. The first drive motor 15 can drive the bidirectional lead screw 14 to rotate, thereby causing the two sliders 16 to move closer or further away from each other. In turn, it can cause the first movable fan 3 and the second movable fan 4 to move away from each other or closer to each other, so as to realize the drive mechanism to drive the first movable fan 3 and the second movable fan 4 to move.
[0037] In this embodiment, the car door device is part of the elevator car structure, and the first mounting plate 12 and the second mounting plate 13 can be installed on the top of the car.
[0038] Furthermore, a guide rod 17 is provided between the first mounting plate 12 and the second mounting plate 13. The length direction of the guide rod 17 is consistent with the length direction of the bidirectional lead screw 14. The guide rod 17 passes through the two sliders 16 and is slidably connected to the two sliders 16. By using the guide rod 17 to guide the two sliders 16, the stability of the movement of the sliders 16 can be further improved, thereby improving the stability of the movement of the first movable fan 3 and the second movable fan 4.
[0039] Furthermore, a second drive motor 18 is provided on the second mounting plate 13. The second drive motor 18 is connected to the bidirectional lead screw 14 so that the first drive motor 15 and the second drive motor 18 jointly drive the bidirectional lead screw 14 to rotate. By providing the second drive motor 18 to also drive the bidirectional lead screw 14 to rotate, the installation redundancy of this device is improved. When the first drive motor 15 fails and cannot drive the second drive motor 18 to rotate, the second drive motor 18 can take over from the first drive motor 15 and continue to drive the bidirectional lead screw 14 to rotate.
[0040] Furthermore, the first drive motor 15, the second drive motor 18, and the bidirectional lead screw 14 are coaxially arranged. The output shaft of the first drive motor 15 is coaxially and fixedly connected to the end of the bidirectional lead screw 14, and the output shaft of the second drive motor 18 is coaxially and fixedly connected to the other end of the bidirectional lead screw 14.
[0041] Furthermore, the top and bottom of the pressure plate 8, away from their corresponding flexible inflatable columns, both protrude to form extension portions 19. The extension portion 19 at the top of the pressure plate 8 is flush with the top of the first movable fan 3, and the extension portion 19 at the bottom of the pressure plate 8 is flush with the top and bottom of the first movable fan 3. The top of the first movable fan 3 is flush with the top of the second movable fan 4, and the bottom of the first movable fan 3 is flush with the bottom of the second movable fan 4. The top and bottom of the mounting groove 10, away from their corresponding flexible inflatable columns, are both provided with second receiving grooves 20 for accommodating the extension portion 19. The extension portion 19 provides an anti-pinch function for the car door from top to bottom. That is, as long as a foreign object is located between the first movable fan 3 and the second movable fan 4, it can be detected by the pressure sensor 7 when it is pinched. The top and bottom of the first receiving groove 11 are both through, so that the first receiving groove 11 can accommodate the extension portion 19.
[0042] Furthermore, a cover 21 is provided on the top of the mounting hole 9 to reduce dust from entering the mounting hole 9.
[0043] Furthermore, the flexible inflatable column includes an upper cover 22, a lower cover 23, and a flexible cylinder 24. The upper cover 22 is sealed and fixed to the top opening of the flexible cylinder 24, and the lower cover 23 is sealed and fixed to the bottom opening of the flexible cylinder 24. Both the upper cover 22 and the lower cover 23 are fixed to the mounting hole 9. The upper cover 22 and the lower cover 23 facilitate the fixed connection between the flexible inflatable column and the mounting hole 9. The flexible cylinder 24 facilitates the compression by the pressure plate 8, causing a change in the pressure inside the flexible inflatable column. The pressure input end of the pressure sensor 7 is sealed through the upper cover 22 and extends into the flexible inflatable column to enable the pressure sensor 7 to detect the air pressure inside the flexible inflatable column. In this embodiment, the flexible cylinder 24 can be a rubber cylinder or a silicone cylinder.
[0044] Furthermore, the first fixed fan 1, the second fixed fan 2, the first movable fan 3, and the second movable fan 4 are all arranged vertically and parallel to each other.
[0045] Furthermore, it also includes a lower guide rail 25, the bottoms of the first movable fan 3 and the second movable fan 4 are slidably connected to the lower guide rail 25, and the lower guide rail 25 is used to improve the stability of the movement of the first movable fan 3 and the second movable fan 4.
[0046] It should be noted that although the present invention has been disclosed above with specific embodiments, the above embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.
Claims
1. A car door device suitable for underground mining elevators, characterized in that, include: A door leaf mechanism, the door leaf mechanism including a first fixed leaf, a second fixed leaf, a first movable leaf and a second movable leaf, wherein the first fixed leaf has a first storage slot for receiving the first movable leaf, and the second fixed leaf has a second storage slot for receiving the second movable leaf; A drive mechanism is connected to both the first movable fan and the second movable fan to drive the first movable fan and the second movable fan to move; The anti-pinch mechanism includes a flexible inflatable column, a pressure sensor, and a pressure plate. Both the first and second movable fans have abutment surfaces. The tops of both the first and second movable fans have vertically oriented mounting holes. These mounting holes are positioned close to their corresponding abutment surfaces. The flexible inflatable column and the pressure sensor are installed within the mounting holes. The pressure input end of the pressure sensor communicates with the flexible inflatable column to detect its pressure. The abutment surface has a mounting groove whose shape matches the pressure plate. This mounting groove communicates with its corresponding mounting hole. The pressure plate is installed within the mounting groove, and one side of the pressure plate abuts against and connects to its corresponding flexible inflatable column. The abutment surface has a first receiving groove for accommodating the pressure plate.
2. The car door device for underground mining elevators as described in claim 1, characterized in that, The driving mechanism includes a first mounting plate, a second mounting plate, a bidirectional lead screw, and a first drive motor. The first mounting plate and the second mounting plate are parallel to each other and vertically arranged. The two ends of the bidirectional lead screw are rotatably connected to the first mounting plate and the second mounting plate, respectively. The first drive motor is mounted on the first mounting plate and is drivenly connected to the bidirectional lead screw. The bidirectional lead screw has two threaded sections with opposite directions of rotation. Each of the two threaded sections is threaded with a slider. The two sliders are fixedly connected to the first movable fan and the second movable fan, respectively, so that the driving mechanism drives the first movable fan and the second movable fan to move.
3. The car door device for underground mining elevators as described in claim 2, characterized in that, A guide rod is provided between the first mounting plate and the second mounting plate. The length direction of the guide rod is consistent with the length direction of the bidirectional lead screw. The guide rod passes through the two sliders and is slidably connected to the two sliders.
4. The car door device for underground mining elevators as described in claim 2, characterized in that, The second mounting plate is equipped with a second drive motor, which is connected to the bidirectional lead screw drive so that the first drive motor and the second drive motor jointly drive the bidirectional lead screw to rotate.
5. The car door device for underground mining elevators as described in claim 4, characterized in that, The first drive motor, the second drive motor, and the bidirectional lead screw are coaxially arranged.
6. The car door device for underground mining elevators as described in claim 1, characterized in that, The top and bottom of the pressure plate both protrude to form extension portions on the side away from their corresponding flexible inflatable columns. The extension portion located at the top of the pressure plate is flush with the top of the first movable fan, and the extension portion located at the bottom of the pressure plate is flush with the top and bottom of the first movable fan. The top of the first movable fan is flush with the top of the second movable fan, and the bottom of the first movable fan is flush with the bottom of the second movable fan. The top and bottom of the mounting groove both have a second receiving groove for accommodating the extension portion on the side away from their corresponding flexible inflatable columns.
7. The car door device for underground mining elevators as described in claim 1, characterized in that, The mounting hole is covered with a cover.
8. The car door device for underground mining elevators as described in claim 1, characterized in that, The flexible inflatable column includes an upper cover, a lower cover, and a flexible cylinder. The upper cover is sealed and fixed to the top opening of the flexible cylinder, and the lower cover is sealed and fixed to the bottom opening of the flexible cylinder. Both the upper cover and the lower cover are fixed to the mounting hole.
9. The car door device for underground mining elevators as described in claim 1, characterized in that, The first fixed fan, the second fixed fan, the first movable fan, and the second movable fan are all vertically arranged and parallel to each other.
10. The car door device for underground mining elevators as described in claim 1, characterized in that, It also includes a lower guide rail, and the bottoms of the first movable fan and the second movable fan are slidably connected to the lower guide rail.