Safety explosion-proof elevator for nuclear power plant

Abstract

The application discloses a safety explosion-proof elevator of a nuclear power plant, which comprises an elevator shaft, a hoisting machine, an elevator car, a grounding device, a take-up device and a tensioning assembly. The hoisting machine is arranged at the top of the elevator shaft. The metal part of the hoisting machine is connected with the grounding device through a first wire. The grounding device comprises a steel pipe buried in the ground. The hoisting machine is connected with the elevator car through a hoisting steel cable. The metal part of the elevator car is connected with the grounding device through a second wire. The second wire passes through the take-up device. The tensioning assembly comprises a supporting seat, a supporting arm and a first wire wheel. The supporting seat is arranged at the top of the elevator shaft. The second wire is connected with the grounding device after passing through the first wire wheel and a second wire wheel in sequence. Compared with the prior art, the safety explosion-proof elevator of the nuclear power plant can effectively avoid sparks during the operation of the elevator and improve the safety of the elevator operation in special areas such as nuclear power plants.

Description

Technical Field

[0001] This invention relates to the field of explosion-proof elevator technology, and more particularly to a safe explosion-proof elevator for nuclear power plants. Background Technology

[0002] An elevator is a permanent transportation device that serves several specific floors within a building, with its car moving along at least two rigid tracks perpendicular to the horizontal plane or at an angle of inclination less than 15° to the vertical. Currently, traction elevators are mainly used in buildings, which use a traction system composed of a traction machine, traction steel cables, and other main components to lift and lower the car. For example, Chinese patent CN216471655U discloses a traction elevator, including: a guide frame with an outer sliding track on its outer side and an inner sliding track on its inner side, the outer and inner sliding tracks being on the same plane; a carrying car with its side walls surrounding the guide frame, the two ends of which are slidably connected to the outer sliding track; a counterweight module built into the guide frame, the two ends of which are slidably connected to the inner sliding track; and a traction device fixedly installed on the top of the guide frame, with its two traction ends connected to the carrying car and the counterweight module, respectively.

[0003] Traction elevators typically employ a fully open design, causing electrical sparks, friction sparks, impact sparks, and electrostatic sparks generated during elevator operation to dissipate directly into the air. This poses significant safety risks when traction elevators are used in special environments such as nuclear power plants, oil production sites, and chemical production sites. Summary of the Invention

[0004] The purpose of this invention is to provide a safe and explosion-proof elevator for nuclear power plants, which can effectively prevent sparks from occurring during elevator operation and improve the safety of elevator operation in special areas such as nuclear power plants.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a safety explosion-proof elevator for nuclear power plants, comprising: an elevator shaft, a traction machine, an elevator car, a grounding device, a take-up coil, and a tensioning assembly. The traction machine is installed at the top of the elevator shaft. The metal part of the traction machine is connected to the grounding device via a first conductor. The grounding device includes a steel pipe buried in the ground. The traction machine is connected to the elevator car via a traction steel cable. The metal part of the elevator car is connected to the grounding device via a second conductor. The second conductor passes through the take-up coil, which includes a housing, a central shaft, an inner ring, and a spring. The housing is provided with a take-up groove, and the side wall of the take-up groove has opposing first and second through holes. The take-up groove is circular. The central shaft is set on the bottom surface of the receiving groove, the inner ring is set inside the receiving groove, and the spring is set inside the inner ring. One end of the spring is connected to the central shaft, and the other end is fixedly installed on the inner ring. The second wire enters the receiving groove through the first through hole, coils around the inner ring, and is led out through the second through hole. The tensioning assembly includes a support base, a support arm, and a first wire wheel. The support base is set at the top of the elevator shaft. The cross-section of the support base is "L". The second wire wheel is set on the side wall plate of the support base. The support arm is installed on the support base. The first wire wheel is rotatably installed at the end of the support arm. The position of the first wire wheel is correspondingly set above the take-up device. The second wire passes around the first wire wheel and the second wire wheel in sequence and is then connected to the grounding device.

[0006] As a further description of the above technical solution:

[0007] A buffer is installed on the bottom surface of the elevator shaft.

[0008] As a further description of the above technical solution:

[0009] The support arm is rotatably mounted on the support base via a first rotating shaft. A reset torsion spring is sleeved on the first rotating shaft, with its two ends abutting against the support arm and the support base, respectively.

[0010] As a further description of the above technical solution:

[0011] An inclination sensor is installed on the support arm to detect whether the support arm is tilted. The inclination sensor is connected to the elevator control cabinet.

[0012] As a further description of the above technical solution:

[0013] The surface of the first guide wheel is provided with an annular groove, and the second guide is disposed in the annular groove.

[0014] As a further description of the above technical solution:

[0015] The cross-section of the annular groove is arc-shaped.

[0016] As a further description of the above technical solution:

[0017] One end of the support arm is provided with an elastic element, one end of which is fixedly installed on the support arm and the other end is fixedly installed on the support base.

[0018] As a further description of the above technical solution:

[0019] A round rod is installed on the side wall panel, and the side of the round rod contacts the second conductor.

[0020] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0021] 1. In this invention, the grounding device is set in the safe area outside the elevator shaft. The traction machine and the elevator car are both grounded through the grounding device, which can effectively prevent sparks from occurring during elevator operation and improve the safety of elevator operation in special areas such as nuclear power plants.

[0022] 2. In this invention, since the elevator car moves up and down during operation and the distance between it and the grounding device changes, in order to avoid the second conductor from interfering with the operation of the elevator car, a take-up device and a tensioning component are used to keep the second conductor between the elevator car and the grounding device in a taut state.

[0023] 3. In this invention, a tilt sensor is installed on the support arm to detect whether the support arm is tilted. The tilt sensor is connected to the elevator control cabinet. When the tilt sensor detects that the support arm is tilted, it indicates that the second conductor, while taut, still has a downward tendency, indicating an emergency situation, such as the elevator car "squatting" or a coil reel malfunction. Therefore, a signal is sent back to the elevator control cabinet to cut off the power supply circuit of the main unit and brake to prevent the car from continuing to descend and to protect the second conductor from being broken. The tilt sensor also forms a double safety mechanism with the limit switch to prevent the limit switch from malfunctioning and cutting off the power supply circuit when the elevator car "squats." Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a structural schematic diagram of a safety explosion-proof elevator for a nuclear power plant.

[0026] Figure 2 This is a schematic diagram illustrating the state changes of a safety explosion-proof elevator in a nuclear power plant.

[0027] Figure 3This is a schematic diagram illustrating the state changes of a tensioning component in a nuclear power plant's explosion-proof safety elevator.

[0028] Figure 4 This is a schematic diagram of the structure of a cable retractor in a safety explosion-proof elevator for a nuclear power plant.

[0029] Figure 5 A schematic diagram of the tensioning assembly in a safety explosion-proof elevator for a nuclear power plant. Figure 1 .

[0030] Figure 6 A schematic diagram of the tensioning assembly in a safety explosion-proof elevator for a nuclear power plant. Figure 2 .

[0031] Figure 7 This is a schematic diagram of the structure of the first guide wheel in a safety explosion-proof elevator for a nuclear power plant.

[0032] Legend:

[0033] 1. Elevator shaft; 2. Traction machine; 21. Traction cable; 3. Elevator car; 4. Grounding device; 41. First conductor; 42. Second conductor; 5. Take-up device; 51. Housing; 511. Reception slot; 52. Central shaft; 53. Inner ring; 54. Spring; 6. Tensioning assembly; 61. Support base; 611. Side wall panel; 612. Second conductor pulley; 613. Round rod; 62. Support arm; 621. Elastic element; 63. First conductor pulley; 631. Annular groove; 7. Buffer. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0036] Please see Figure 1-7This invention provides a technical solution: a safety explosion-proof elevator for nuclear power plants, comprising: an elevator shaft 1, a traction machine 2, an elevator car 3, a grounding device 4, a take-up cable 5, and a tensioning assembly 6. The traction machine 2 is installed at the top of the elevator shaft 1. The metal part of the traction machine 2 is connected to the grounding device 4 via a first conductor 41. The grounding device 4 includes a steel pipe buried in the ground. The traction machine 2 is connected to the elevator car 3 via a traction steel cable 21. The metal part of the elevator car 3 is connected to the grounding device 4 via a second conductor 42. The second conductor 42 passes through the take-up cable 5. The take-up cable 5 includes a housing 51, a central shaft 52, an inner ring 53, and a spring 54. The housing 51 is provided with a receiving groove 511. The side wall of the receiving groove 511 is provided with opposing first and second through holes. The receiving groove 511 is circular. The central shaft 52 is located on the bottom surface of the receiving groove 511. The inner ring 53 is set in the storage groove 511, and the spring 54 is set in the inner ring 53. One end of the spring 54 is connected to the central shaft 52, and the other end is fixedly installed on the inner ring 53. The second wire 42 enters the storage groove 511 through the first through hole, is wound around the inner ring 53, and is led out from the second through hole. The tensioning assembly 6 includes a support base 61, a support arm 62, and a first wire wheel 63. The support base 61 is set at the top of the elevator shaft 1. The cross-section of the support base 61 is "L". The second wire wheel 612 is set on the side wall plate 611 of the support base 61. The support arm 62 is installed on the support base 61. The first wire wheel 63 is rotatably installed at the end of the support arm 62. The position of the first wire wheel 63 is correspondingly set above the take-up device 5. The second wire 42 passes around the first wire wheel 63 and the second wire wheel 612 in sequence and is connected to the grounding device 4.

[0037] A buffer 7 is installed on the bottom surface of the elevator shaft 1. The buffer 7 is used to absorb energy and buffer when the elevator car 3 malfunctions or when the bottom of the elevator car 3 exceeds the lowest point of its normal travel. In other words, it absorbs energy and buffers when the elevator car 3 "squats" (or "squats"). The buffer 7 can be used in conjunction with a limit switch. The limit switch activates before the car contacts the buffer and remains activated during the compression of the buffer. After the limit switch activates, it directly cuts off the power supply circuit to the main unit and brake to prevent the car from continuing to descend.

[0038] The support arm 62 is rotatably mounted on the support base 61 via a first rotating shaft. A return torsion spring is sleeved on the first rotating shaft, with its two ends abutting against the support arm 62 and the support base 61, respectively. Under normal conditions, the support arm 62 remains horizontal under the elastic force of the return torsion spring. When the elevator car 3 "squats," the support arm 62 rotates downward because the first guide wheel 63 at one end of the support arm 62 is pulled downward by the tensioned second guide 42. Thus, when the elevator car 3 reaches its limit and travels beyond the lowest point of its normal travel, the second guide 42 can continue to be pulled downward when the spring 54 is compressed to its limit, preventing the second guide 42 from breaking and avoiding safety risks.

[0039] A tilt sensor is installed on the support arm 62 to detect whether the support arm 62 is tilted. The tilt sensor is connected to the elevator control cabinet. When the tilt sensor detects that the support arm 62 is tilted, it indicates that the second conductor 42, while taut, still has a downward tendency, indicating an emergency situation. This could be due to the elevator car 3 "squatting" or the retractor 5 malfunctioning. Therefore, a signal is sent to the elevator control cabinet to cut off the power supply circuit of the main unit and brake to prevent the car from continuing to descend and to protect the second conductor 42 from being broken. The tilt sensor also forms a double safety mechanism with the limit switch to prevent the limit switch from malfunctioning and cutting off the power supply circuit when the elevator car 3 "squats."

[0040] The surface of the first guide wheel 63 is provided with an annular groove 631, and the second guide 42 is disposed in the annular groove 631, effectively positioning the second guide 42 that bypasses the first guide wheel 63 and preventing the position of the second guide 42 from shifting.

[0041] The cross-section of the annular groove 631 is arc-shaped to prevent damage to the second conductor 42.

[0042] An elastic element 621 is provided at one end of the support arm 62. One end of the elastic element 621 is fixedly mounted on the support arm 62, and the other end is fixedly mounted on the support base 61. When the support arm 62 is in a horizontal state, the elastic element 621 is not stretched and remains in its initial state. After the support arm 62 is pulled down and tilted by the second guide wire 42, the elastic element 621 is stretched and undergoes elastic deformation. The elastic element 621 can work in conjunction with a return torsion spring to effectively ensure that the support arm 62 returns to its original position and remains horizontal when it is not pulled down.

[0043] A round rod 613 is provided on the side wall plate 611, and the side of the round rod 613 contacts the second guide wire 42. The round rod 613 helps to keep the second guide wire 42 taut and limits the rotation angle of the support arm 62, preventing the end of the support arm 62 away from the first guide wheel 63 from contacting the second guide wire 42.

[0044] Working principle: The grounding device 4 is installed in the safe area outside the elevator shaft 1. The traction machine 2 and the elevator car 3 are both grounded through the grounding device 4, which can effectively prevent sparks from occurring during elevator operation and improve the safety of elevator operation in special areas such as nuclear power plants.

[0045] Because the elevator car 3 moves up and down during operation, and its distance from the grounding device 5 changes, to prevent the second conductor 42 from interfering with the operation of the elevator car 3, the second conductor 42 between the elevator car 3 and the grounding device 5 is kept taut by the coil take-up device 5 and the tensioning assembly 6. Specifically: When the elevator car 3 descends, the second conductor 42 is pulled out from the second through hole on the upper side of the housing 51. The second conductor 42 drives the inner coil 53 to rotate around the central axis 52, and the spring 54 is compressed and tightened. The second conductor 42 passes around the first conductor wheel 63 and the second conductor wheel 612 in sequence before connecting to the grounding device 4, maintaining tension. When the elevator car 3 ascends, the second conductor 42 is released, the spring 54 is released, the inner coil 53 rotates in the opposite direction, and coils and winds up the second conductor 42, keeping the second conductor 42 taut.

[0046] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A safety explosion-proof elevator for nuclear power plants, characterized in that, include: The elevator shaft (1), traction machine (2), elevator car (3), grounding device (4), cable reel (5), and tensioning assembly (6) are provided. The traction machine (2) is installed on the top of the elevator shaft (1). The metal part of the traction machine (2) is connected to the grounding device (4) through a first conductor (41). The grounding device (4) includes a steel pipe buried in the ground. The traction machine (2) is connected to the elevator car (3) through a traction steel cable (21). The metal part of the elevator car (3) is connected to the grounding assembly (6) through a second conductor (42). The grounding device (4) is described above. The second conductor (42) passes through the take-up device (5). The take-up device (5) includes a housing (51), a central shaft (52), an inner ring (53), and a spring (54). The housing (51) is provided with a receiving groove (511). The side wall of the receiving groove (511) is provided with opposing first through holes and second through holes. The receiving groove (511) is circular. The central shaft (52) is located on the bottom surface of the receiving groove (511). The inner ring (53) is located on the receiving groove (511). Inside, the spring (54) is disposed inside the inner ring (53). One end of the spring (54) is connected to the central shaft (52), and the other end is fixedly installed on the inner ring (53). The second wire (42) enters the receiving groove (511) through the first through hole, then winds around the inner ring (53) and is led out from the second through hole. The tensioning assembly (6) includes a support base (61), a support arm (62), and a first wire wheel (63). The support base (61) is disposed at the top of the elevator shaft (1). The cross-section of the support (61) is "L" shaped. A second guide wheel (612) is provided on the side wall plate (611) of the support (61). The support arm (62) is installed on the support (61). The first guide wheel (63) is rotatably installed at the end of the support arm (62). The position of the first guide wheel (63) is correspondingly set above the take-up device (5). The second guide (42) passes around the first guide wheel (63) and the second guide wheel (612) in sequence and then connects to the grounding device (4).

2. The explosion-proof safety elevator for a nuclear power plant according to claim 1, characterized in that, A buffer (7) is provided on the bottom surface of the elevator shaft (1).

3. The explosion-proof safety elevator for a nuclear power plant according to claim 2, characterized in that, The support arm (62) is rotatably mounted on the support base (61) via a first rotating shaft. A reset torsion spring is sleeved on the first rotating shaft, and the two ends of the reset torsion spring abut against the support arm (62) and the support base (61) respectively.

4. The explosion-proof safety elevator for a nuclear power plant according to claim 3, characterized in that, An inclination sensor is provided on the support arm (62), which is used to detect whether the support arm (62) is tilted. The inclination sensor is connected to the elevator control cabinet.

5. The explosion-proof safety elevator for a nuclear power plant according to claim 3, characterized in that, The surface of the first guide wheel (63) is provided with an annular groove (631), and the second guide (42) is disposed in the annular groove (631).

6. The explosion-proof safety elevator for a nuclear power plant according to claim 5, characterized in that, The cross-section of the annular groove (631) is arc-shaped.

7. A safety explosion-proof elevator for a nuclear power plant according to claim 3, characterized in that, One end of the support arm (62) is provided with an elastic element (621), one end of the elastic element (621) is fixedly installed on the support arm (62), and the other end is fixedly installed on the support base (61).

8. A safety explosion-proof elevator for a nuclear power plant according to claim 7, characterized in that, A round rod (613) is provided on the side wall plate (611), and the side of the round rod (613) contacts the second conductor (42).

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