An environmentally friendly ventilation elevator

Abstract

The present application relates to the field of elevators, and in particular to an environmentally friendly ventilated elevator, comprising a stairwell, a car sliding in the stairwell, and a driving mechanism arranged in the stairwell to drive the car to slide. The elevator is characterized in that a ventilation component is arranged on the top of the car, a linkage component for driving the ventilation component to operate is arranged between the stairwell and the car, and a filter component for filtering the air is also arranged on the inside of the car. By adopting the above scheme, the elevator is environmentally friendly and energy-saving on the one hand, and the comfort of the passengers on board is improved on the other hand.

Description

Technical Field

[0001] The present application relates to the field of elevators, and in particular to an environmentally friendly ventilation elevator. Background Art

[0002] An elevator is a permanent transport device that serves specific floors within a building, with its car running on at least two rows of rigid tracks perpendicular to the horizontal plane or with an angle of less than 15 degrees to the vertical. Most existing elevators are passenger elevators.

[0003] Normally, it is not allowed to install air conditioners in elevators. However, since elevators are used more frequently by people in office buildings and carry more people each time, ventilation equipment needs to be installed in the elevator. Existing elevator ventilation equipment installs ventilation fans on the ceiling of the elevator and then uses motors to drive the ventilation fans to rotate, thereby achieving ventilation effects. However, this type of elevator uses motors to drive the ventilation fans to rotate for a long time, which can easily cause the motor to overheat and be damaged. Secondly, the cable is inconvenient to install in the elevator, and a winding device is required to rewind and unwind the cable. The motor-driven ventilation fan alone greatly increases the cost of using the elevator. Summary of the Invention

[0004] In order to reduce the operating cost of the elevator and avoid damage to the ventilation motor due to long-term operation, the present application provides an environmentally friendly ventilation elevator.

[0005] This application provides an environmentally friendly ventilation elevator, which adopts the following technical solutions:

[0006] An environmentally friendly ventilated elevator includes a shaft, a car sliding in the shaft, and a driving mechanism arranged in the shaft to drive the car to slide. The elevator is characterized in that a ventilation component is arranged on the top of the car, a linkage component for driving the ventilation component to operate is arranged between the shaft and the car, and a filter component for filtering air is also arranged on the inside of the car.

[0007] By adopting the above technical solution, the driving mechanism drives the car to slide vertically in the elevator shaft, and the ventilation component is operated under the action of the linkage component. During the whole process, there is no need to install additional electrical equipment for exhaust and ventilation treatment. The up and down movement of the elevator drives the operation of the linkage component, thereby driving the ventilation equipment to supply fresh air into the car, and finally filtered by the filter component. On the one hand, it is environmentally friendly and energy-saving, and on the other hand, it improves the comfort of the passengers.

[0008] Optionally, the ventilation assembly is provided with two groups, and the ventilation assembly includes a first gear rotatably connected to the top outside the car, a first worm coaxially fixed on the first gear shaft, a first worm wheel rotatably connected to the top of the car and meshing with the first worm, a first rod coaxially fixed on the first worm wheel, a second rod rotatably connected to the top of the car, a second worm coaxially fixed on the outside of the second rod, an impeller rotatably connected to the top of the car, and a second worm wheel coaxially fixed on the impeller shaft and meshing with the second worm, a ventilation hole connected to the interior of the car is provided on the top of the car, the impeller is rotatably connected in the ventilation hole, the first rod and the second rod are coaxially arranged, and the second rod is provided with a first connecting member that drives the second rod to rotate unidirectionally at one end facing the first rod, and a second connecting member that drives the second rod to rotate unidirectionally at one end of the second rod away from the first rod.

[0009] By adopting the above technical solution, during the ventilation process, by driving the car to move vertically up and down, the two first gears rotate, so that the first worm engages with the first worm wheel to rotate, and the first worm wheel and the first rod rotate synchronously. Under the action of the first connecting member, the first rod and the second rod are rotated unidirectionally synchronously, so that the second rod and the second worm rotate synchronously, and the second worm engages with the second worm wheel to rotate, so that the impeller rotates synchronously, and the airflow in the ventilation duct in the stairwell is sucked into the car.

[0010] Optionally, the first connecting member includes a disc coaxially fixed to one end of the first rod facing the second rod, a pawl rotatably connected to the disc, a spring fixed to the side wall of the disc for pressing the pawl, and an inner ratchet coaxially arranged on the outside of the disc, the jaws on the two discs are arranged in opposite directions, and the inner ratchet is coaxially fixed to the end of the second rod.

[0011] By adopting the above technical solution, two groups of first connecting members are also provided, in which the direction of the pawl on one disc is set opposite to the direction of the pawl on the other disc, so that one of the impellers is rotated in the process of driving the first rod to rotate. Regardless of whether the car moves vertically up or down, one impeller is always guaranteed to rotate, thereby ensuring ventilation in the car.

[0012] Optionally, the second connecting member includes a ventilation motor fixed on the top of the car, a battery arranged on the top of the car for powering the ventilation motor, and a controller arranged on the top of the car for controlling the energy conversion between the motor and the battery. The rotating shaft of the ventilation motor is coaxially fixedly connected to the end of the second rod away from the first rod. The ventilation motor is electrically connected to the battery and the controller. An emergency switch for controlling the conduction of the electrical circuit of the ventilation motor is also provided on the top of the car. The emergency switch is electrically connected to the elevator fire emergency power supply system.

[0013] By adopting the above technical solution, the first rod drives the second rod to rotate in the process of driving the car to move vertically up and down, thereby driving the motor's shaft to rotate, and the ventilation motor is used as a generator. The generated electric energy is stored in the battery through the controller. When the elevator's fire emergency system fails, the elevator's fire emergency power supply system is started, and the electric energy in the battery is supplied to the ventilation motor through the controller, and the ventilation motor's shaft is driven to rotate, so that the second worm engages the second worm wheel to rotate, and drives the impeller to rotate. Due to the setting of the internal ratchet, the first rod is difficult to rotate during the process of the ventilation motor driving the impeller to rotate, thereby ensuring the normal operation of the second rod.

[0014] Optionally, the linkage assembly includes a rack fixed on the inside of the stairwell, a second gear rotatably connected to the top of the car, a third worm coaxially fixed on the second gear shaft, a third worm wheel rotatably connected to the top of the car and meshing with the third worm, a third rod coaxially fixed on the third worm wheel shaft, a first bevel gear coaxially fixed on the third rod away from the third worm wheel end, a second bevel gear rotatably connected to the top of the car and meshing with the first bevel gear, a third gear coaxially fixed on the second bevel gear shaft, and a synchronous belt arranged on the first gear and the third gear, the third gear is located between the two first gears, and the first gear and the third gear are both meshed with the synchronous belt.

[0015] By adopting the above technical solution, when driving the car to slide vertically up and down, the second gear engages the rack, so that the second gear and the third worm rotate synchronously, and the third worm wheel and the third rod rotate synchronously. Under the action of the synchronous belt, the two first gears and the third gear rotate synchronously, thereby realizing the driving of the first gear.

[0016] Optionally, the filter assembly includes a partition fixed on the top of the car cavity and a mesh plate fixed around the partition, the partition and the mesh plate form an air cavity at the top of the car cavity, and the ventilation hole is connected to the ventilation cavity.

[0017] By adopting the above technical solution, the impeller brings the external air flow in and out of the air cavity, and finally blows it into the inner cavity of the car through the mesh plate. Since the mesh plate is arranged on the peripheral side of the partition, the air flow is prevented from directly blowing on the skin of the passengers, thereby improving comfort while ensuring ventilation.

[0018] Optionally, the partition is a silencer plate, and the mesh plate is made of porous activated carbon.

[0019] By adopting the above technical solution, the silencer reduces wind noise, and the activated carbon mesh plate facilitates ventilation on the one hand, and can absorb odors of the air flow entering the car on the other hand.

[0020] Optionally, the inner cavity side walls of the car are paved with fireproof and heat-insulating panels.

[0021] By adopting the above technical solutions, the fireproof insulation board is based on inorganic mineral raw materials, perlite, plant fiber and other natural materials, and is refined using special processes such as scientific thermal reactions and special formulas, which further ensures the safety of people in the elevator and reduces the occurrence of fire.

[0022] Optionally, the driving mechanism includes a winch arranged on the side wall of the inner cavity at the upper end of the ladder shaft, and a steel wire rope wound on a winding shaft of the winch, and the free end of the steel wire rope is fixedly connected to the car.

[0023] By adopting the above technical solution, the elevator microcomputer controls the operation of the winch, thereby reeling in and out the wire rope to achieve the lifting and lowering of the car, thereby achieving the purpose of elevator transportation.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] The impeller brings the external air flow in and out of the air cavity, and finally blows it into the inner cavity of the car through the mesh plate. Since the mesh plate is set on the side of the partition, it prevents the air flow from directly blowing on the skin of the passengers, thereby improving comfort while ensuring ventilation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of this embodiment.

[0027] Figure 2 Schematic diagram of the top structure of the car in this embodiment.

[0028] Figure 3 yes Figure 2 A partial enlarged view of point A in the middle.

[0029] Figure 4 Schematic diagram of the overall structure of the first connecting member in this embodiment.

[0030] Figure 5 yes Figure 4 A partial enlarged view of point B in the middle.

[0031] Figure 6 yes Figure 2 A partial enlarged view of point C in the middle.

[0032] Figure 7 yes Figure 2 A partial enlarged view of point D in the middle.

[0033] Figure 8 It is a cross-sectional view of the car in this embodiment.

[0034] Reference numerals: 1, stairwell; 2, car; 3, drive mechanism; 4, ventilation assembly; 5, linkage assembly; 6, filter assembly; 7, first gear; 8, first worm; 9, first worm gear; 10, first rod; 11, second rod; 12, second worm; 13, impeller; 14, second worm gear; 15, ventilation hole; 16, first connecting member; 17, second connecting member; 18, disc; 19, pawl; 20, spring; 21 , inner ratchet; 22. ventilation motor; 23. battery; 24. controller; 25. emergency switch; 26. rack; 27. second gear; 28. third worm; 29. ​​third worm wheel; 30. third rod; 31. third gear; 32. synchronous belt; 33. partition; 34. mesh plate; 35. air cavity; 36. fireproof insulation board; 37. winch; 38. wire rope; 39. first bevel gear; 40. second bevel gear. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-8 This application is described in further detail.

[0036] The embodiments of the present application disclose an environmentally friendly ventilation elevator.

[0037] Reference Figure 1 An environmentally friendly ventilation elevator includes a shaft 1, a car 2, and a driving mechanism 3 arranged in the shaft 1 to drive the car 2 to slide. The car 2 slides vertically in the inner cavity of the shaft 1. A ventilation duct connected to the outside world is also provided on the side wall of the shaft 1. The outside air can enter the inner cavity of the shaft 1 through the ventilation duct.

[0038] Reference Figure 1 The driving mechanism 3 includes a winch 37 and a wire rope 38. The winch 37 is fixed on the upper side wall of the ladder shaft 1. The wire rope 38 is wound on the winding roller of the winch 37. The free end of the wire rope 38 is fixedly connected to the upper side wall of the car 2, driving the winding roller of the winch 37 to rotate, thereby pulling the car 2 to slide vertically up and down in the ladder shaft 1.

[0039] Reference Figure 2 A layer of fireproof insulation board 36 is fixed on the inner cavity side wall of the car 2. The fireproof insulation board 36 is based on natural materials such as inorganic mineralized raw materials, perlite, plant fiber, etc., and is refined using special processes such as scientific thermal reaction and special formula. It has the functions of heat insulation, heat preservation, fire prevention, waterproof, anti-corrosion, anti-expansion, anti-contraction, and pressure resistance. Therefore, the car 2 equipped with the fireproof insulation board 36 has the functions of heat insulation and fire prevention, thereby ensuring the safety of the people carried in the car 2.

[0040] Reference Figure 2 and Figure 3A ventilation assembly 4 is provided on the top of the car 2. The ventilation assembly 4 is optimally arranged as two groups. The ventilation assembly 4 includes a first gear 7 and a first worm 8. The first gear 7 is rotatably connected to the top side wall of the car 2. The first worm 8 is coaxially fixed on the rotating shaft of the first gear 7. The ventilation assembly 4 also includes a first worm wheel 9 and a first rod 10. The first worm wheel 9 is rotatably connected to the top of the car 2, and the first worm wheel 9 is engaged with the first worm 8. The first rod 10 is coaxially fixed on the rotating shaft of the first worm wheel 9, driving the first gear 7 to rotate, thereby realizing the synchronous rotation of the first rod 10.

[0041] Reference Figure 1-4 The ventilation assembly 4 also includes a second rod 11, a second worm 12, an impeller 13 and a second worm gear 14. The second rod 11 is coaxially arranged at the end of the first rod 10 away from the first worm gear 9. The first rod 10 and the second rod 11 are close to each other and are provided with a first connecting member 16. The second worm 12 is coaxially fixed on the side wall of the second rod 11. The second worm gear 14 is coaxially fixed to the impeller 13. A ventilation hole 15 is opened on the top of the car 2. The ventilation hole 15 is connected to the inner cavity of the car 2. The impeller 13 is rotated and connected in the ventilation hole 15. In the process of driving the first rod 10 and the second rod 11 to rotate, the second worm 12 engages the second worm gear 14 to rotate, so that the impeller 13 rotates in the ventilation hole 15, so that the airflow entering the ladder shaft 1 is blown into the inner cavity of the car 2, and finally flows out of the car 2 from the gap of the plate of the car 2.

[0042] Reference Figure 2 、 Figure 4 and Figure 5 The first connecting member 16 includes a disc 18, a pawl 19, a spring 20 and an inner ratchet 21. The disc 18 is coaxially fixed on the side wall of one end of the first rod 10 facing the second rod 11, and the inner ratchet 21 is coaxially arranged on the outside of the disc 18. The inner ratchet 21 is coaxially fixed on the side wall of the end of the second rod 11 facing the first rod 10. The pawl 19 is rotatably connected to the side wall of the disc 18. One end of the spring 20 is fixed to the side wall of the disc 18, and the other end is fixedly connected to the side wall of the pawl 19, so that the pawl 19 engages with the teeth of the inner ratchet 21. It is known that the first connecting member 16 is also provided with two groups, and the directions of the clamping claws on the two discs 18 are set in opposite directions, so that no matter whether the car 2 moves vertically up and down, one of the second rods 11 will be kept rotating, and ventilation into the car 2 will be achieved.

[0043] Reference Figure 6In order to ensure the ventilation comfort of the passengers in the car 2 and improve the safety of the passengers in the event of an elevator failure, a second connecting member 17 is provided at the end of the second rod 11 away from the first rod 10. The second connecting member 17 includes a ventilation motor 22, a battery 23 and a controller 24. The ventilation motor 22 is fixed to the top of the car 2, and the rotating shaft of the ventilation motor 22 is coaxially fixedly connected to the second rod 11 through a coupling. The battery 23 is fixed on the top side wall of the car 2. The battery 23 is electrically connected to the ventilation motor 22. The battery 23 and the second motor can convert energy to each other. When the elevator is in normal operation, the second rod 11 and the rotating shaft of the ventilation motor 22 rotate synchronously in the process of driving the car 2 to move vertically, so that the ventilation motor 22 acts as a generator and stores electrical energy in the battery 23 under the action of the controller 24. The controller 24 is mainly a single-chip microcomputer with an MCU chip.

[0044] Reference Figure 5 and Figure 6 In the event of an elevator malfunction, to ensure comfortable ventilation for occupants, an emergency switch 25 is installed at the top of the car 2. This switch is electrically connected to the electrical circuit of the ventilation motor 22 and primarily controls the opening and closing of the ventilation motor 22. The emergency switch 25 is electrically connected to the elevator's fire emergency power supply system. When the elevator alarm is triggered, the emergency switch 25 is closed, thereby opening the electrical circuit of the ventilation motor 22. Under the control of the controller 24, the battery 23 reversely supplies power to the ventilation motor 22, driving the shaft of the ventilation motor 22 and synchronously rotating the second rod 11, achieving active ventilation. Due to the internal ratchet 21 between the first rod 10 and the second rod 11, the first rod 10 is unable to rotate synchronously with the second rod 11 during the rotation of the ventilation motor 22.

[0045] Reference Figure 1 and Figure 2 In order to utilize the vertical movement characteristics of the car 2 to realize the rotation of the impeller 13, a linkage assembly 5 for driving the ventilation assembly 4 is arranged between the ladder shaft 1 and the car 2. The linkage assembly 5 includes a rack 26 and a second gear 27. The rack 26 is vertically arranged and fixedly embedded in the inner cavity side wall of the ladder shaft 1. The second gear 27 is rotatably connected to the top edge side wall of the car 2, and the second gear 27 is engaged with the rack 26.

[0046] Reference Figure 2 The linkage assembly 5 also includes a third worm 28, a third worm wheel 29 and a third rod 30. The third worm 28 is coaxially fixed on the rotating shaft of the second gear 27. The third worm wheel 29 is engaged with the third worm 28. The third worm wheel 29 is rotatably connected to the top side wall of the car 2. The third rod 30 is coaxially fixed on the rotating shaft of the third worm wheel 29.

[0047] Reference Figure 2 、 Figure 3 and Figure 7 The linkage assembly 5 also includes a first bevel gear 39, a second bevel gear 40, a third gear 31, and a timing belt 32. The first bevel gear 39 is coaxially fixed to the end of the third rod 30 away from the third worm gear 29. The second bevel gear 40 is rotatably connected to the top of the car 2 and meshes with the first bevel gear 39. The third gear 31 is coaxially fixed to the end of the second bevel gear 40 away from the first bevel gear 39. The third gear 31 is located between the two first gears 7, and the timing belt 32 is wrapped around the first gear 7 and the third gear 31. As the car 2 slides vertically up and down, the third rod 30 rotates, and under the action of the timing belt 32, the two first gears 7 rotate synchronously.

[0048] Reference Figure 8 The inner side of the car 2 is also provided with a filter assembly 6 for filtering air. The filter assembly 6 includes a partition 33 and a mesh panel 34. The partition 33 is a sound-absorbing panel made of aluminum-plastic material, and a number of micropores are provided on the side wall of the aluminum-plastic panel to achieve the effect of absorbing noise. The mesh panel 34 is fixed to the peripheral side of the partition 33 and forms a cover with the partition 33 and is fixed on the top inner wall of the car 2. The mesh panel 34, the partition 33 and the top side wall of the car 2 form an air cavity 35. The ventilation hole 15 is connected to the air cavity 35. The material of the mesh panel 34 is set to be a porous activated carbon mesh. On the one hand, it makes it difficult for the airflow entering the air cavity 35 to blow directly on the skin of the passengers. On the other hand, the activated carbon mesh absorbs the odor in the airflow, thereby improving the comfort of the passengers.

[0049] The implementation principle of an environmentally friendly ventilation elevator in an embodiment of the present application is as follows: the lifting and lowering of the car 2 is achieved by a winch 37. During the vertical movement of the car 2, the second gear 27 engages the rack 26 to rotate the second gear 27, thereby causing the third rod 30 to rotate synchronously under the action of the third worm 28 and the third worm wheel 29. The third rod 30 and the third gear 31 rotate synchronously. Under the action of the synchronous belt 32, the two first gears 7 rotate synchronously, thereby achieving synchronous unidirectional rotation of the first rod 10 and the second rod 11. Then, under the action of the second worm 12 and the second worm wheel 14, the impeller 13 rotates. By utilizing the up and down movement of the car 2, ventilation in the car 2 is achieved.

[0050] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An environmentally friendly ventilation elevator comprising a shaft (1), a car (2) sliding in the shaft (1), and a driving mechanism (3) arranged in the shaft (1) to drive the car (2) to slide, characterized in that: A ventilation assembly (4) is provided on the top of the car (2), a linkage assembly (5) for driving the ventilation assembly (4) is provided between the ladder shaft (1) and the car (2), and a filter assembly (6) for filtering air is also provided on the inner side of the car (2); The ventilation assembly (4) is provided with two groups, and the ventilation assembly (4) comprises a first gear (7) rotatably connected to the top of the outer side of the car (2), a first worm (8) coaxially fixed on the rotating shaft of the first gear (7), a first worm wheel (9) rotatably connected to the top of the car (2) and meshing with the first worm (8), a first rod (10) coaxially fixed on the first worm wheel (9), a second rod (11) rotatably connected to the top of the car (2), a second worm (12) coaxially fixed on the outside of the second rod (11), an impeller (13) rotatably connected to the top of the car (2), and a first impeller (13) coaxially fixed on the impeller. (13) a second worm wheel (14) on the rotating shaft meshing with the second worm (12); a ventilation hole (15) communicating with the inner cavity of the car (2) is provided on the top of the car (2); the impeller (13) is rotatably connected in the ventilation hole (15); the first rod (10) and the second rod (11) are coaxially arranged; the second rod (11) is provided with a first connecting member (16) at one end facing the first rod (10) for driving the second rod (11) to rotate in one direction; and the second rod (11) is provided with a second connecting member (17) at one end away from the first rod (10) for driving the second rod (11) to rotate in one direction; The second connecting member (17) comprises a ventilation motor (22) fixed on the top of the car (2), a battery (23) arranged on the top of the car (2) for supplying power to the ventilation motor (22), and a controller (24) arranged on the top of the car (2) for controlling energy conversion between the motor and the battery (23); the rotating shaft of the ventilation motor (22) is coaxially fixedly connected to the end of the second rod (11) away from the first rod (10); the ventilation motor (22) is electrically connected to the battery (23) and the controller (24); an emergency switch (25) for controlling the conduction of the electrical circuit of the ventilation motor (22) is also arranged on the top of the car (2); the emergency switch (25) is electrically connected to the elevator fire emergency power supply system; The first connecting member (16) comprises a disc (18) coaxially fixed to one end of the first rod (10) facing the second rod (11), a pawl (19) rotatably connected to the disc (18), a spring (20) fixed to the side wall of the disc (18) for pressing the pawl (19), and an inner ratchet (21) coaxially arranged on the outer side of the disc (18), wherein the jaws on the two discs (18) are arranged in opposite directions, and the inner ratchet (21) is coaxially fixedly connected to the end of the second rod (11); The linkage assembly (5) comprises a rack (26) fixed on the inner side of the ladder shaft (1), a second gear (27) rotatably connected to the top of the car (2), a third worm (28) coaxially fixed on the rotating shaft of the second gear (27), a third worm wheel (29) rotatably connected to the top of the car (2) and meshing with the third worm (28), a third rod (30) coaxially fixed on the rotating shaft of the third worm wheel (29), a first bevel gear (39) coaxially fixed to one end of the third rod (30) away from the third worm wheel (29), a second bevel gear (40) rotatably connected to the top of the car (2) and meshing with the first bevel gear (39), a third gear (31) coaxially fixed on the rotating shaft of the second bevel gear (40), and a gear (32) provided between the first gear (7) and the third gear (33). 1), the third gear (31) is located between the two first gears (7), and the first gear (7) and the third gear (31) are both engaged with the synchronous belt (32); in the event of an elevator failure, in order to ensure the comfort of ventilation for the passengers in the car (2) and improve the safety of the passengers, the emergency switch (25) is electrically connected to the elevator fire emergency power supply system. When the elevator alarm is triggered, the emergency switch (25) is in a closed state, thereby conducting the electric circuit of the ventilation motor (22). Under the action of the controller (24), the battery (23) reversely supplies power to the ventilation motor (22), thereby driving the rotating shaft of the ventilation motor (22) to operate and driving the second rod (11) to rotate synchronously, thereby realizing active ventilation.

2. The environmentally friendly ventilation elevator according to claim 1, characterized in that: The filter assembly (6) comprises a partition (33) fixed on the top of the inner cavity of the car (2) and a mesh plate (34) fixed around the partition (33). The partition (33) and the mesh plate (34) form an air cavity (35) at the top of the inner cavity of the car (2), and the ventilation hole (15) is connected to the ventilation cavity (35).

3. The environmentally friendly ventilation elevator according to claim 2, characterized in that: The partition (33) is a sound-absorbing plate, and the mesh plate (34) is made of porous activated carbon.

4. The environmentally friendly ventilation elevator according to claim 1, characterized in that: The inner cavity side walls of the car (2) are all paved with fireproof heat insulation boards (36).

5. The environmentally friendly ventilation elevator according to claim 1, characterized in that: The driving mechanism (3) comprises a hoist (37) arranged on the side wall of the inner cavity at the upper end of the ladder shaft (1), and a steel wire rope (38) wound on a reel of the hoist (37), wherein the free end of the steel wire rope (38) is fixedly connected to the car (2).

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