Patent Publication Number: US-9840399-B2

Title: Mining elevator carrying platform and carrying method

Description:
TECHNICAL FIELD 
     The present invention relates to a mining elevator carrying platform and a carrying method, which are especially suitable for a mining elevator with a flexible guide rail as well as lapping of a common platform, provide safety protection and facilitate load transport into and out of the elevator, and ensure that the doorsill size of mining elevator complies with the safety standard for elevators. 
     BACKGROUND 
     Along with the high speed constant development of Chinese economic construction and the progress of mining machinery and elevator technology, mining elevator, as a product developed from the combination of mining lifter and elevator, has been introduced as a new user-friendly lifting apparatus into mine lifting systems. A mining elevator is a new mine lifting apparatus which is developed on the basis of conventional traction elevator and winch cage, by introducing elevator technology into mine lifting systems, employs a special steel cable as the guide rail, and transports persons and goods between the underground and the ground circularly. The mining elevator has significantly improved lifting efficiency, but the requirements for safe and reliability are much higher. At present, an elevator usually employs a rigid guide rail in close contact with a guide shoe to ensure the clearance between the ground sill and the landing door meets the requirement (30 mm) specified in the safety standard for elevators. However, in the harsh environment in a mine, the guide rail may incline, distort, tilt, or locally bulge, resulting in potential risks, for example, the elevator car is stuck in the rail; in addition, the strength of shaft wall and the construction conditions can not be satisfied. Therefore, a steel cable with higher rigidity is used as a flexible guide rail, so that appropriate safety distance can be provided between the elevator car and the landing platform; thus, a carrying device is required to connect the elevator car to the landing platform, to meet the safety standard for elevators. The existing carrying devices used in mine lifting system, such as cage seat, bridle, cradle, and cage supporter, etc., don&#39;t meet the requirement for multi-platform connection and are not suitable for multi-platform connection of a mining elevator with a flexible guide rail. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a side view of the mining elevator carrying platform in the present invention; 
         FIG. 2  is a schematic diagram of the power system in the mining elevator carrying platform in the present invention; 
         FIG. 3  is a schematic diagram of the carrying device in the mining elevator carrying platform in the present invention; 
         FIG. 4  is a side view of the mining elevator carrying platform in carrying state in the present invention; 
         FIG. 5  is a schematic diagram of the mining elevator carrying platform in retracted state in the present invention. 
     
    
    
     DETAILED DESCRIPTION 
     To overcome the drawbacks in the prior art, the present invention provides a mining elevator carrying platform, which has advantages such as simple structure, high safety, high action accuracy, and easy operation; in addition, the present invention provides a carrying method. 
     The mining elevator carrying platform in the present invention comprises a power system fixed to an elevator car and a four-rod carrying device, a rotating rod connected with the power system is arranged on the carrying device; the power system comprises an explosion-proof motor, an upper limit switch, a lower limit switch, and a main pulley that are fixed to a bottom beam of the elevator car in sequence, the explosion-proof motor is connected with the main pulley via a main steel cable wound on the explosion-proof motor, a stop plate is arranged on the main steel cable, the main pulley has a double cable channel, and is connected with a sub-pulley fixed to a side beam of the elevator car via a sub-steel cable, a sliding plate is arranged on the sub-steel cable, and a sliding rod designed to fix the rotating rod is arranged on the sliding plate; the carrying device comprises a supporting bracket fixed to a ground sill support of the elevator car, a carrying board rotates around a rotating shaft of the ground sill support, a rocker connected with the supporting bracket is provided on the lower part of the carrying board, and a connecting rod connected with the carrying board is provided on the rocker. 
     The rotating rod has a strip-opening sliding slot fitted over the sliding rod in its middle part; strengthening ribs are provided under the carrying board, and a supporting plate rib supported on the rocker is provided on the outer end of the carrying board. 
     The carrying method for the mining elevator carrying platform in the present invention is characterized in: 
     when the elevator car lands, the explosion-proof motor drives the main steel cable, the main steel cable drives the main pulley to rotate, and the sub-steel cable wound on the main pulley drives the sub-pulley to rotate at the same time, the sliding plate moves up and down so that the sliding rod moves in the strip-opening sliding slot of the rotating rod, and thereby the rotating rod and the carrying board are driven to move circularly, and the connecting rod drives the rocker to rotate around the supporting bracket; 
     when the stop plate on the main steel cable hits the upper limit switch, the explosion-proof motor stops, the end face of the rocker abuts against the end face of the supporting plate rib on the carrying board, and the carrying board reaches a preset position and self-locks, so that the persons and goods can enter or exit the elevator car via the carrying board; 
     when the landing door and elevator car door are closed, the explosion-proof motor drives the main steel cable and thereby drives the main pulley to rotate in reverse direction, and, when the stop plate hits the lower limit switch, the explosion-proof motor stops, and the carrying board is retracted and reset. 
     With the technical scheme described above, the carrying platform and carrying method can achieve reliable carrying of the lapping platform at multiple horizontal planes, accomplish safe transport of the load into and out of the elevator car, and ensure that the mining elevator complies with the safety standard for elevators in terms of the structure of landing door and elevator door; thus, the load can be transported into and out of the elevator car more safely and reliably; the carrying platform is simple in structure, can be controlled accurately, is easy and convenient to install and maintain, and operates stably. The advantages include: 
     (1) A platform can be connected to corresponding working plane at different heights, the elevator car lapping platform can be connected reliably at multiple horizontal working planes, and the initial investment at each horizontal working plane can be reduced; 
     (2) The carrying device employs a four-rod structure and has self-locking function; thus, the load can be transported into and out of the elevator car more safely and reliably; 
     (3) The power system employs a steel cable for traction; thus, the arrangement is convenient, the structure is simple, and the carrying platform can be lapped and retracted easily and conveniently; 
     (4) The control is accurate, the installation and maintenance is convenient, and the operation is stable; thus, the elevator operates more safely and reliably. 
     Hereunder the embodiments of the present invention will be described with reference to the accompanying drawings: 
     As shown in  FIG. 1 , the carrying platform in the present invention comprises a power system  1  fixed to an elevator car  2  and a four-rod carrying device  5 , wherein, a rotating rod  3  connected with the power system  1  is arranged on the carrying device  5 , the rotating rod  3  has a strip-opening sliding slot, and a sliding rod  1 - 10  is connected in the strip-opening sliding slot. 
     As shown in  FIG. 2 , the power system  1  comprises an explosion-proof motor  1 - 1 , an upper limit switch  1 - 2 , a lower limit switch  1 - 5 , and a main pulley  1 - 6  that are fixed to a bottom beam of the elevator car  2  in sequence, wherein, the explosion-proof motor  1 - 1  is connected with the main pulley  1 - 6  via the main steel cable  1 - 4  wound on the explosion-proof motor  1 - 1 , a stop plate  1 - 3  is arranged on the main steel cable  1 - 4 , the main pulley  1 - 6  has a double cable channel, and is connected with a sub-pulley  1 - 8  fixed to a side beam of the elevator car  2  via a sub-steel cable  1 - 7 , a sliding plate  1 - 9  is arranged on the sub-steel cable  1 - 7 , and a sliding rod  1 - 10  designed to fix the rotating rod  3  is arranged on the sliding plate  1 - 9 . 
     As shown in  FIG. 3 , the carrying device comprises a supporting bracket  5 - 4  fixed to a ground sill support  4  of the elevator car  2 , a carrying board  5 - 1  that is fixedly connected to the rotating rod  3  and can rotated around a rotating shaft  4 - 1  of the ground sill support  4 , a rocker  5 - 3  connected with the supporting bracket  5 - 4  is provided on the lower part of the carrying board  5 - 1 , and a connecting rod  5 - 2  connected with the carrying board  5 - 1  is provided on the rocker  5 - 3 . 
     Strengthening ribs  5 - 5  are provided under the carrying board  5 - 1  and a supporting plate rib  5 - 6  supported on the rocker  5 - 3  is provided on the outer end of the carrying board  5 - 1 ; in carrying state, the end face of the supporting plate rib  5 - 6  on the carrying board  5 - 1  abuts against the end face of the rocker  5 - 3 ; in this embodiment, three connecting rods  5 - 2 , three rockers  5 - 3 , and three supporting brackets  5 - 4  are provided, and are parallel to each other. 
     The carrying method for the mining elevator carrying platform in the present invention is characterized in: 
     As shown in  FIG. 4  and  FIG. 5 , when the elevator car lands, the explosion-proof motor  1 - 1  drives the main steel cable  1 - 4 , the main steel cable  1 - 4  drives the main pulley  1 - 6  to rotate, and the sub-steel cable  1 - 7  wound on the main pulley  1 - 6  drives the sub-pulley  1 - 8  to rotate at the same time, the sliding plate  1 - 9  moves up and down so that the sliding rod  1 - 10  moves in the strip-opening sliding slot of the rotating rod  3 , and thereby the rotating rod  3  and the carrying board  5 - 1  are driven to move circularly, and the connecting rod  5 - 2  drives the rocker  5 - 3  to rotate around the supporting bracket  5 - 4 ; 
     when the stop plate  1 - 3  on the main steel cable  1 - 4  hits the upper limit switch  1 - 2 , the explosion-proof motor  1 - 1  stops, the end face of the rocker  5 - 3  abuts against the end face of the supporting plate rib  5 - 6  on the carrying board  5 - 1 , and the carrying board  5 - 1  reaches a preset position and self-locks, so that the persons and goods can enter or exit the elevator car via the carrying board; 
     when the landing door and elevator car door are closed, the explosion-proof motor  1 - 1  drives the main steel cable  1 - 4  and thereby drives the main pulley  1 - 6  to rotate in reverse direction, and, when the stop plate  1 - 3  hits the lower limit switch  1 - 5 , the explosion-proof motor  1 - 1  stops, and the carrying board  5 - 1  is retracted. 
     Among the drawings: 
       1 —power system, 
       2 —elevator car, 
       3 —rotating rod, 
       4 —ground sill support, 
       5 —carrying device; 
       1 - 1 —explosion-proof motor, 
       1 - 2 —upper limit switch, 
       1 - 3 —stop plate, 
       1 - 4 —main steel cable, 
       1 - 5 —lower limit switch, 
       1 - 6 —main pulley, 
       1 - 7 —sub-steel cable, 
       1 - 8 —sub-pulley, 
       1 - 9 —sliding plate, 
       1 - 10 —sliding rod; 
       5 - 1 —carrying board, 
       5 - 2 —connecting rod, 
       5 - 3 —rocker, 
       5 - 4 —supporting bracket.