Pedestrian and car shunting intelligent safety platform suitable for vertical shaft double-layer cage

By introducing an intelligent safety platform into the vertical shaft double-layer tank cage, the use of sensors and hydraulic control systems to achieve safe diversion between personnel and mine trucks, the safety hazards of personnel and mine trucks in the transportation of double-layer tank cages are solved and the safety is improved.

CN223188758UActive Publication Date: 2025-08-05JIANGSU ZHONGMIN JIAOLIAN SMART MINING TECHNOLOGY RESEARCH INSTITUTE CO LTD
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Patent Information

Application Number
CN202422269586.3
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-09-18
Publication Date
2025-08-05
Estimated Expiration
2034-09-18

AI Technical Summary

Technical Problem

In the prior art, there are safety hazards in the transportation of personnel and mine trucks in coal mine vertical shaft double-layer tank cages, especially the lack of effective protection between the lower lane and the sidewalk.

Method used

An intelligent safety platform for human-vehicle diversion of double-layer tank cages is designed, including upper movable doors of the tank cage, upper squadron platform, infrared sensors, mine truck protective cages and other components, and the divergence and safety protection of personnel and mine trucks are achieved through sensors and hydraulic control systems.

Benefits of technology

It effectively improves the safety of the double-layer tank cage transportation, ensures the safe separation of personnel and mine trucks at different levels, and reduces safety hazards.

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Abstract

A groove is formed in a platform body of an upper-layer personnel platform, a platform lap joint plate is arranged in the groove, and a platform lap joint plate telescopic control hydraulic rod in the groove controls the platform lap joint plate to be in butt joint with the bottom face of the upper layer of the cage. Infrared sensors are fixedly mounted on the surface of the upper-layer personnel platform on the two sides of the platform lapping plate; the cage upper-layer movable door is additionally arranged on the upper-layer personnel platform, protection in the cage direction is provided for personnel, whether personnel exist in the upper-layer personnel platform and the cage or not is sensed through the personnel ultrasonic sensor, and whether the passing opening telescopic stop lever is opened to release the personnel or not is determined according to the working state of the mine car protection cage. The mine car protection cage is additionally arranged below the upper-layer personnel platform, mine cars needing to go up and down the cage are standby in the mine car protection cage, the mine cars needing to be queued stop outside the safety distance, and the safety can be further improved.
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Description

Technical Field

[0001] The utility model relates to the technical field of mining machinery, in particular to an intelligent safety platform for separating people and vehicles in a double-layer cage of a vertical shaft. Background Art

[0002] A coal mine shaft, also known as a vertical shaft, is a crucial engineering structure in underground coal mining. It provides direct access to the surface and serves as the primary exit from the mine. To increase transportation capacity, most coal mines with the necessary conditions opt to utilize a double-deck cage. Currently, a personnel platform is typically built at the wellhead to accommodate this double-deck cage. However, this platform is structurally simple, with no separation between the staircase and the lower level entrance and exit, posing a significant safety hazard when transporting personnel and mine cars.

[0003] Currently, a utility model patent with the publication number CN201991534U discloses a double-deck cage ladder for synchronized entry and exit for personnel in mines. The ladder comprises a platform with four equal-height columns installed at the bottom; a ladder installed on one side of the platform; and handrails installed on both sides of the platform and ladder. This system allows personnel on both the upper and lower levels of the double-deck cage to enter and exit the cage simultaneously when the lower level is parked at the ground level in the middle of the mine, eliminating the need to wait for the cage to change levels. This saves time for personnel, increases lifting efficiency, and effectively conserves lifting energy.

[0004] From the above disclosed technical content, it can be seen that as an existing technology, although the utility model with announcement number CN201991534U improves safety to a certain extent through handrails, it does not provide sufficient protection between the lower lane and the sidewalk, and therefore cannot well guarantee the safety of people. Summary of the Invention

[0005] In response to the problems existing in the above-mentioned prior art, the utility model provides an intelligent safety platform for separating people and vehicles suitable for double-layer tank cages in vertical shafts, which can effectively separate personnel and mine cars and effectively improve safety.

[0006] In order to achieve the above-mentioned purpose, the utility model provides an intelligent safety platform for separating people and vehicles for double-layer cages in vertical shafts, comprising an upper movable door of the cage, an upper personnel platform, a platform body, an infrared sensor, a platform lap plate, a telescopic control hydraulic rod of the platform lap plate, a guardrail, a telescopic barrier rod for the passage, a personnel passage, a step ladder, a mine car protective cage, a mine car protective cage safety door opening and closing hydraulic rod, a mine car loading and unloading assembly, a crane, a tipping machine, a tipping connecting rod, a vehicle control hydraulic rod, an electromagnet, a mine car protective cage safety door, a personnel ultrasonic sensor and a laser fence sensor. The upper personnel platform is respectively installed at the front and rear of the double-layer cage through brackets, and the upper personnel platform is flush with the bottom plate of the upper layer of the cage. The upper movable door of the cage is arranged on the side of the upper personnel platform facing the cage, and a groove is provided on the platform body of the upper personnel platform, and a platform lap plate is provided in the groove, and the platform lap plate in the groove is telescopically controlled by a hydraulic rod. The control platform overlap plate is connected to the upper bottom surface of the tank cage, and infrared sensors are fixedly installed on the surface of the upper personnel platform on both sides of the platform overlap plate; guardrails are fixedly installed around the upper personnel platform, and a retractable barrier rod for the passage is opened on the guardrail, and a ladder is overlapped at the retractable barrier rod for the passage, and a retractable barrier rod for the passage is fixedly installed on the guardrail at the personnel passage; a mine car protection cage is provided under the upper personnel platform, and a overlapping device is provided at one end of the mine car protection cage facing the lower layer of the tank cage, and a mine car protection cage safety door is installed at the other end through a rotating shaft, and the mine car protection cage safety door opening and closing hydraulic rod installed on the inside of the mine car protection cage controls the opening and closing of the mine car protection cage safety door; the mine car loading and unloading assembly is installed on the upper part of the inner side of the mine car protection cage through brackets and rails; a laser fence sensor is fixedly installed on the surface of the mine car protection cage on the side of the mine car protection cage safety door, and a personnel ultrasonic sensor is installed on the guardrail through a bracket, and the personnel ultrasonic sensor is located directly in front of the tank cage.

[0007] In addition, the intelligent safety platform for separating people and vehicles in a double-deck cage in a vertical shaft according to the above embodiment of the present invention may also have the following additional technical features:

[0008] As a further improvement scheme of the present invention, the mine car loading and unloading assembly includes a crane, a tilting machine, a tilting connecting rod, a vehicle control hydraulic rod and an electromagnet. The tilting machine is fixedly installed at the lower part of the crane, and the rotating shaft of the tilting machine is connected to the vehicle control hydraulic rod through the tilting connecting rod. The electromagnet is fixedly installed on one end of the vehicle control hydraulic rod facing the tank cage.

[0009] As a further improvement of the present invention, the turning machine includes a turning drive motor, a gear set and a turning shaft, wherein the turning drive motor is a stepping motor.

[0010] As a further improvement of the present invention, the mine car loading and unloading assembly is externally equipped with a camera.

[0011] As a further improvement of the present invention, the upper personnel platform and the mine car protective cage are both equipped with lighting equipment.

[0012] Through the above scheme, the utility model has at least the following advantages: compared with conventional pedestrian platforms, by adding an upper movable door of the cage on the upper personnel platform, personnel are provided with protection in the direction of the cage, and the personnel ultrasonic sensor is used to sense whether there are still personnel on the upper personnel platform and inside the cage. Combined with the working status of the mine car protective cage, it is determined whether to open the retractable barrier bar at the passage to release personnel, thereby effectively improving safety. At the same time, by adding a mine car protective cage under the upper personnel platform, mine cars that need to get on and off the cage can wait inside the mine car protective cage, while mine cars that need to queue can be parked at a safe distance, which can further improve safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0014] Figure 1 This is a structural diagram of an intelligent safety platform for separating people and vehicles, suitable for double-deck cages in vertical shafts;

[0015] Figure 2 This is a cross-sectional view of an intelligent safety platform for separating people and vehicles in a double-deck cage in a vertical shaft;

[0016] Figure 3 This is a cross-sectional view of an intelligent safety platform for separating people and vehicles in a double-deck cage in a vertical shaft;

[0017] Figure 4 This is a cross-sectional view of an intelligent safety platform for separating people and vehicles in a double-deck cage in a vertical shaft;

[0018] In the figure: 1. Upper movable door of the cage, 2. Upper personnel platform, 2-1. Platform body, 2-2. Infrared sensor, 2-3. Platform lap plate, 2-4. Telescopic control hydraulic rod of the platform lap plate, 3. Guardrail, 4. Telescopic barrier rod of the passage, 5. Personnel passage, 6. Staircase, 7. Mine car protective cage, 8. Hydraulic rod for opening and closing the safety door of the mine car protective cage, 9. Mine car loading and unloading assembly, 9-1. Driving, 9-2. Tilting machine, 9-3. Tilting connecting rod, 9-4. Vehicle control hydraulic rod, 9-5. Electromagnet, 10. Safety door of the mine car protective cage, 11. Personnel ultrasonic sensor, 12. Laser fence sensor. DETAILED DESCRIPTION

[0019] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0020] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, in the description of this specification, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one such feature. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0021] The following describes an intelligent safety platform for separating people and vehicles in a double-layer tank cage in a vertical shaft in accordance with the present invention with reference to the accompanying drawings.

[0022] In Example 1 of the present application, Figure 1 、 Figure 2 and Figure 4As shown, the present invention is a kind of intelligent safety platform for personnel and vehicle diversion in double-layer cage of vertical shaft (hereinafter referred to as "the present invention"), comprising a cage upper movable door 1, an upper personnel platform 2, a platform body 2-1, an infrared sensor 2-2, a platform lap plate 2-3, a platform lap plate telescopic control hydraulic rod 2-4, a guardrail 3, a passage telescopic blocking rod 4, a personnel passage 5, a step ladder 6, a mine car protection cage 7, a mine car protection cage safety door opening and closing hydraulic rod 8, a mine car loading and unloading assembly 9, a driving crane 9-1, a tilting machine 9-2, a tilting machine 9-3, a tilting machine 9-4, a tilting machine 9-5, a tilting machine 9-6, a tilting machine 9-7, a tilting machine 9-8, a tilting machine 9-9, a tilting machine 9-1 ...2, a tilting machine 9-3, a tilting machine 9-4, a tilting machine 9-5, a tilting machine 9-6, a tilting machine 9-8, a tilting machine 9-9, a tilting machine 9-1, a tilting machine 9-1, a tilting machine 9-2, a tilting machine 9-3, a tilting machine 9-4, a tilting machine 9-5, a tilting machine 9-6, a tilting machine 9-8, a tilting machine 9-9, a tilting machine 9-1, a tilting machine Connecting rod 9-3, vehicle control hydraulic rod 9-4, electromagnet 9-5, mine car protective cage safety door 10, personnel ultrasonic sensor 11, laser fence sensor 12, the upper personnel platform 2 is installed on the front and back of the double-layer cage through brackets, the upper personnel platform 2 is flush with the bottom plate of the upper layer of the cage, the upper personnel platform 2 is provided with the cage upper movable door 1 on the side facing the cage, the platform body 2-1 of the upper personnel platform 2 is provided with a groove, the groove is equipped with a platform overlap plate 2-3, and the platform overlap plate in the groove is retractable The hydraulic rod 2-4 controls the platform lap plate 2-3 to dock with the bottom surface of the upper layer of the cage. Infrared sensors 2-2 are fixedly installed on the surface of the upper personnel platform 2 on both sides of the platform lap plate 2-3; guardrails 3 are fixedly installed around the upper personnel platform 2, and a retractable barrier rod 4 for the passage is opened on the guardrail 3. The retractable barrier rod 4 for the passage is overlapped with a step 6, and a retractable barrier rod 4 for the passage is fixedly installed on the guardrail 3 at the personnel passage 5; a mine car protection cage 7 is provided under the upper personnel platform 2, and the mine car protection cage 7 is provided at one end toward the lower layer of the cage. A lap joint device is provided, and a mine car protective cage safety door 10 is installed at the other end through a rotating shaft. The mine car protective cage safety door opening and closing hydraulic rod 8 installed on the inner side of the mine car protective cage 7 controls the opening and closing of the mine car protective cage safety door 10; a mine car loading and unloading assembly 9 is installed on the upper inner side of the mine car protective cage 7 through a bracket and a track; a laser fence sensor 12 is fixedly installed on the surface of the mine car protective cage 7 on the side of the mine car protective cage safety door 10, and a personnel ultrasonic sensor 11 is installed on the guardrail 3 through a bracket, and the personnel ultrasonic sensor 11 is located directly in front of the cage.

[0023] The utility model announcement number is CN201991534U, a double-layer cage for mines with synchronized entry and exit ladders for personnel (hereinafter referred to as "this patent"). Although this patent improves safety to a certain extent through handrails, it does not provide sufficient protection between the lower lane and the sidewalk, and therefore cannot well guarantee the safety of personnel. The present invention further improves safety by adding a mine car protection cage 7 under the upper personnel platform 2, allowing mine cars that need to get on and off the cage to wait inside the mine car protection cage 7, while mine cars that need to queue are parked at a safe distance.

[0024] The structure of the second embodiment is basically the same as that of the first embodiment, except that Figure 3As shown, the mine car loading and unloading assembly 9 includes a traveling crane 9-1, a tilting machine 9-2, a tilting connecting rod 9-3, a vehicle control hydraulic rod 9-4, and an electromagnet 9-5. The tilting machine 9-2 is fixedly installed at the bottom of the traveling crane 9-1. The rotating shaft of the tilting machine 9-2 is connected to the vehicle control hydraulic rod 9-4 through the tilting connecting rod 9-3. The electromagnet 9-5 is fixedly installed on one end of the vehicle control hydraulic rod 9-4 facing the cage. Although the mine car can be pulled and pushed by wire rope traction and manual pushing, as the most preferred solution, the mine car is grasped and pushed and pulled by the vehicle control hydraulic rod 9-4 and the electromagnet 9-5 in front and behind the cage, which can provide more operating space and safety.

[0025] To further optimize the operational efficiency of this application, the tilting mechanism 9-2 includes a tilting drive motor, a gear train, and a tilting shaft to better control the upward tilting of the vehicle control hydraulic lever 9-4, preventing it from interfering with the entry and exit of the mine car. To further enhance the intelligence of the device, the mine car loading and unloading assembly 9 is equipped with an external camera, which can be connected to a control machine to achieve self-stopping and self-control of obstacles. To enhance the camera's functionality, both the upper personnel platform 2 and the mine car protective cage 7 are equipped with lighting equipment.

[0026] When in use, an intelligent safety platform for separating people and vehicles suitable for a double-layer cage in a vertical shaft is installed in front and behind the cage. After connecting the corresponding pipelines, the equipment can be put into use.

[0027] When the utility model is in use, the specific operations are as follows:

[0028] During loading, the mine car protective cage safety door opening and closing hydraulic rod 8 controls the mine car protective cage safety door 10 to open, and the built-in electrode of the turning machine 9-2 of the mine car loading and unloading assembly 9 controls the turning link 9-3 and the vehicle control hydraulic rod 9-4 to rotate upward ninety degrees with the turning shaft of the turning machine 9-2 as the center. Then, the mine car that needs to carry the cage first enters the mine car protective cage 7, and the mine car protective cage safety door opening and closing hydraulic rod 8 controls the mine car protective cage safety door 10 to close. The turning link 9-3 of the mine car loading and unloading assembly 9 is reset, and the cage stops steadily. The infrared sensor 2-2 of the upper personnel platform 2 senses the cage and receives the signal that the cage is in place. The platform lap plate telescopic control hydraulic rod 2-4 pushes the platform lap plate 2-3 extends out and docks with the upper layer of the cage. At the same time, the overlapping device of the mine car protective cage 7 overlaps the lower layer of the cage. At this time, the staff begins to enter the upper layer of the cage. At the same time, the vehicle control hydraulic rod 9-4 pushes the electromagnet 9-5 to contact the surface of the mine car, and generates magnetic force to attract the mine car. Then the driving 9-1 drives the vehicle control hydraulic rod 9-4 and the electromagnet 9-5 along the track to push the mine car into the cage, and at the same time pushes the mine car that needs to be unloaded in the cage into the opposite mine car protective cage 7. After being pushed into place, the electromagnet 9-5 is powered off and the mine car loading and unloading assembly 9 is reset. At this time, the safety officer confirms the safety status. After confirmation, he sends a signal, the upper movable door 1 of the cage is closed, the fence door of the cage is closed, and the cage can go down.

[0029] When the cage returns to the ground for unloading, the new mine car is already on standby in the mine car protection cage 7 on the entrance side. After the safety officer confirms safety, he opens the upper movable door 1 of the cage, and the fence door of the cage opens. The personnel ultrasonic sensor 11 senses that people begin to enter the upper personnel platform 2 one after another. At this time, the system confirms that the mine car protection cage safety door 10 of the mine car protection cage 7 is in the closed state, and the retractable barrier rod 4 of the passage can be opened to let people pass. At the same time, the vehicle control hydraulic rod 9-4 on the entrance side pushes the electromagnet 9-5 to contact the surface of the mine car, and generates magnetic force to attract the mine car. Then the driving 9-1 drives the vehicle control hydraulic rod 9-4 and the electromagnet 9-5 along the track to push the mine car into the cage, and at the same time pushes the mine car that needs to be unloaded in the cage into the mine car protection cage 7 on the opposite side. After being pushed into place, the electromagnet 9-5 is powered off, and the mine car loading and unloading assembly 9 is reset, thereby completing the loading of the new mine car.

[0030] In summary, the embodiment of the utility model is an intelligent safety platform for separating people and vehicles in a double-layer cage in a vertical shaft. By adding an upper movable door 1 of the cage on the upper personnel platform 2, protection is provided to personnel in the direction of the cage. The personnel ultrasonic sensor 11 senses whether there are still people on the upper personnel platform 2 and inside the cage. Combined with the working status of the mine car protection cage 7, it is determined whether the retractable barrier 4 of the passage should be opened to release personnel, thereby effectively improving safety. At the same time, by adding a mine car protection cage 7 under the upper personnel platform 2, the mine cars that need to get on and off the cage can wait inside the mine car protection cage 7, while the mine cars that need to queue are parked at a safe distance, which can further improve safety.

[0031] In this specification, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this utility model, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0032] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0033] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and features of different embodiments or examples, unless they are mutually inconsistent.

[0034] Those skilled in the art will understand that the discussion of any of the above embodiments is merely illustrative and is not intended to limit the scope of the present invention to these examples. Within the spirit and principles of the present invention, the technical features of the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and many other variations exist for the various aspects of the present invention described above, which are not provided in detail for the sake of clarity. Any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An intelligent safety platform for separating people and vehicles in a double-layer tank cage in a vertical shaft, comprising an upper movable door (1), an upper personnel platform (2) and a guardrail (3), wherein the upper personnel platform (2) is respectively installed at the front and rear of the double-layer tank cage through brackets, and the upper personnel platform (2) is flush with the bottom plate of the upper layer of the tank cage, and is characterized in that: The upper personnel platform (2) is provided with a cage upper movable door (1) on one side facing the cage, a groove is provided on the platform body (2-1) of the upper personnel platform (2), a platform lap plate (2-3) is provided in the groove, a platform lap plate in the groove is telescopically controlled by a hydraulic rod (2-4) to control the platform lap plate (2-3) to dock with the upper bottom surface of the cage, and infrared sensors (2-2) are fixedly installed on the surface of the upper personnel platform (2) on both sides of the platform lap plate (2-3); A guardrail (3) is fixedly installed around the platform (2), and a retractable barrier rod (4) for a passage is provided on the guardrail (3), and a step ladder (6) is overlapped at the retractable barrier rod (4) for the passage. The retractable barrier rod (4) for the passage is fixedly installed on the guardrail (3) at the personnel passage (5); a mine car protection cage (7) is provided below the upper personnel platform (2), and a lap device is provided at one end of the mine car protection cage (7) toward the lower layer of the cage, and a mine car protection cage safety door (10) is installed at the other end through a rotating shaft. A mine car protection cage safety door opening and closing hydraulic rod (8) installed on the inner side of the mine car protection cage (7) controls the opening and closing of the mine car protection cage safety door (10); a mine car loading and unloading assembly (9) is installed on the upper inner side of the mine car protection cage (7) through a bracket and a track; a laser fence sensor (12) is fixedly installed on the surface of the mine car protection cage (7) on the side of the mine car protection cage safety door (10), and a personnel ultrasonic sensor (11) is installed on the guardrail (3) through a bracket, and the personnel ultrasonic sensor (11) is located directly in front of the tank cage; the mine car loading and unloading assembly (9) includes a traveling crane (9-1), a tilting machine (9-2), a tilting connecting rod (9-3), a vehicle control hydraulic rod (9-4) and an electromagnet (9-5); the tilting machine (9-2) is fixedly installed on the lower part of the traveling crane (9-1), the rotating shaft of the tilting machine (9-2) is connected to the vehicle control hydraulic rod (9-4) through the tilting connecting rod (9-3), and the vehicle control hydraulic rod (9-4) is fixedly installed with an electromagnet (9-5) at one end facing the tank cage.

2. The intelligent safety platform for separating people and vehicles in a double-deck cage in a vertical shaft according to claim 1 is characterized in that: The flipping machine (9-2) comprises a flipping drive motor, a gear set and a flipping shaft, wherein the flipping drive motor is a stepping motor.

3. The intelligent safety platform for separating people and vehicles in a double-deck cage in a vertical shaft according to claim 1 is characterized in that: The mine car loading and unloading assembly (9) is externally equipped with a camera.

4. The intelligent safety platform for separating people and vehicles in a double-deck cage in a vertical shaft according to claim 3 is characterized in that: The upper personnel platform (2) and the mine car protection cage (7) are both equipped with lighting equipment.

Citation Information

Patent Citations

  • Synchronous entrance and exit step for double-layer cage personnel in mine

    CN201991534U