An elevator pre-buffer structure

Abstract

The present invention relates to an elevator pre-buffer structure, which includes a hoistway, a car, a counterweight, a traction machine and a buffer assembly; the hoistway includes a pit, an intermediate running layer and a top layer, the buffer assembly includes a car buffer and a counterweight buffer, when the car moves to the bottommost layer, the lower end surface is in the pit and compresses the car buffer; when the car moves to the topmost layer, the lower end surface of the counterweight is in the pit and compresses the counterweight buffer; a pair of magnets with the same magnetic poles are relatively arranged between the bottom surface of the car and the upper end surface of the car buffer, and between the bottom surface of the counterweight and the upper end surface of the counterweight buffer; by reducing the depth of the pit, the present invention enables the car and the counterweight to respectively compress the car buffer and the counterweight buffer when descending to the bottommost layer once, realizes real-time verification of the buffer assembly, ensures its normal operation, and avoids the failure to play a safety protection role due to the abnormal state of the buffer assembly in case of emergencies.

Description

Technical Field

[0001] The present invention relates to the technical field of elevator hoistways and buffering, and particularly relates to an elevator pre-buffering structure. Background Art

[0002] The elevator hoistway required for elevator operation consists of multiple parts. Taking an elevator with a machine room as an example, it includes the elevator pit height, the elevator running height, the elevator top floor height, and the elevator machine room height; according to the relevant regulations of the elevator code GB7588, to meet the elevator acceptance standards and considering the actual hoistway errors, the pit of general elevator manufacturers is set at a height of 1500 mm, and the top floor is set at a height of 4500 mm; if in actual situations, the hoistway top floor height or the pit depth does not meet the requirements, the Party A needs to rectify the hoistway, and there will also be situations where the hoistway cannot be rectified; referring to GB7588 5.7, the national standard stipulates that the pit depth needs to meet the requirements of 5.7.3, and the top floor height needs to meet the requirements of 5.7.1. When the pit depth of the on-site elevator hoistway is 1000 mm, according to the latest national standard requirements, this hoistway will not meet the elevator acceptance standards.

[0003] As Figure 1 shown, regarding the buffering component 02 inside the elevator, it is an elevator safety device that provides the last level of safety protection. It is installed in the pit of the elevator hoistway 01, directly below the car 03 and the counterweight 04. When the elevator is moving up or down, due to factors such as wire rope breakage, traction friction, insufficient brake braking force, or control system failure, and it exceeds the bottom or top of the terminal landing, the buffer will play a buffering role to prevent the elevator car or the counterweight from directly hitting the bottom or the top, protecting the safety of passengers and equipment; during the normal operation of the elevator, the buffer does not need to work, which makes the buffer unable to self-detect whether it is in a malfunction state due to long-term non-use. If an accident occurs to the car when the buffer malfunctions, the buffer cannot play a safety protection role. Therefore, regular manual inspections are still required, resulting in a large workload; the present invention has developed an elevator pre-buffering structure to solve the problems existing in the prior art. After searching, no technical solutions identical or similar to the present invention have been found. Summary of the Invention

[0004] The object of the present invention is to provide an elevator pre-buffering structure to solve the problem in the prior art that the pit depth below the hoistway is too high to perform qualified verification on the buffering components inside the pit in real time.

[0005] The technical solution of the present invention is: an elevator pre-buffer structure, including a hoistway, a car installed inside the hoistway, a counterweight, a traction machine, and a buffer assembly for buffering the car and the counterweight; the hoistway includes a pit, an intermediate running layer and a top layer in the vertical direction, the buffer assembly is arranged in the pit, including a car buffer and a counterweight buffer, when the car moves to the bottommost layer, the lower end face is in the pit and compresses the car buffer; when the car moves to the topmost layer, the lower end face of the counterweight is in the pit and compresses the counterweight buffer; a pair of magnets with the same magnetic poles are oppositely arranged between the bottom surface of the car and the upper end surface of the car buffer, and between the bottom surface of the counterweight and the upper end surface of the counterweight buffer.

[0006] Preferably, a reset limit switch is installed on both the car buffer and the counterweight buffer, and the reset limit switch operates in the compressed state of the car buffer and the counterweight buffer.

[0007] Preferably, an impact limit switch is installed on both the car buffer and the counterweight buffer, and the impact limit switch operates when a failure occurs in the car buffer and the counterweight buffer, and when the car cannot decelerate at the end station.

[0008] Preferably, both the car buffer and the counterweight buffer include a cylinder body, a piston rod and a reset spring for automatically resetting the piston rod; the impact limit switch includes a switch body A fixed to the side of the upper end of the piston rod and a switch plate A fixed to the bottom of the car for triggering the switch body A; the reset limit switch includes a switch body B fixed to the side of the cylinder body and a switch plate B fixed to the side of the piston rod for triggering the switch body B.

[0009] Preferably, the magnet is selected from one of a permanent magnet or an electromagnet.

[0010] Compared with the prior art, the advantages of the present invention are:

[0011] (1) By reducing the depth of the pit, the present invention enables the car to compress the car buffer when it descends to the bottommost layer once, and the counterweight can also compress the counterweight buffer when it descends to the bottommost layer once, realizing real-time verification of the buffer assembly, ensuring its normal operation, and avoiding the inability to play a safety protection role due to the abnormal state of the buffer assembly in case of emergencies; at the same time, the reduction of the pit depth also facilitates the construction of the hoistway, and the relative top layer height will also be reduced.

[0012] (2) A pair of magnets with the same magnetic poles are relatively arranged between the bottom surface of the car and the upper end surface of the car buffer, and between the bottom surface of the counterweight and the upper end surface of the counterweight buffer. When the car or the counterweight compresses the buffer assembly, direct contact is avoided, effectively reducing noise and protecting the buffer assembly at the same time. Further, a pair of magnets with the same-sex repulsion can also play a certain buffering role when approaching each other.

[0013] (3) The impact limit switch is mainly applied in emergencies and operates when the bottom of the car collides abnormally with the car buffer, and the bottom of the counterweight collides abnormally with the counterweight buffer, that is, it operates when the car buffer and the counterweight buffer fail and when the car cannot decelerate at the end station, to achieve further limit buffering.

[0014] (4) The reset limit switch operates when the car buffer and the counterweight buffer are in a compressed state. When it is fully reset, the reset limit switch disconnects, so as to be used to judge whether the car buffer and the counterweight buffer can work normally, that is, whether they can be normally reset after being compressed, and thus the real-time verification of the buffer assembly is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with the drawings and embodiments:

[0016] Figure 1 is a schematic diagram of an elevator and a hoistway structure in the prior art;

[0017] Figure 2 is a schematic diagram of a pre-buffering structure of an elevator according to the present invention;

[0018] Figure 3 is a partially enlarged view of a pre-buffering structure of an elevator according to the present invention;

[0019] Figure 4 is a schematic diagram of the structure of the car buffer in the compressed state according to the present invention;

[0020] Figure 5 is a schematic diagram of the structure of the car buffer in the non-compressed state according to the present invention.

[0021] Among them: 1, hoistway; 2, car; 3, counterweight; 4, traction machine; 5, buffer assembly; 6, car buffer; 7, counterweight buffer; 8, pit; 9, intermediate running layer; 10, top floor; 11, magnet; 12, reset limit switch; 13, switch body B; 14, switch board B; 15, impact limit switch; 16, switch body A; 17, switch board A; 18, cylinder block; 19, piston rod; 20, reset spring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The content of the present invention will be further described in detail below in conjunction with specific embodiments:

[0023] As Figure 2 , Figure 3 shown, an elevator pre-buffer structure includes a hoistway 1, a car 2 installed inside the hoistway 1, a counterweight 3, a traction machine 4, and a buffer assembly 5 for buffering the car 2 and the counterweight 3; the hoistway 1 includes a pit 8, an intermediate running layer 9, and a top layer 10 in the vertical direction, and a machine room is also provided above the hoistway 1.

[0024] The buffer assembly 5 is arranged in the pit 8 and includes a car buffer 6 and a counterweight buffer 7. Combining Figure 4 , Figure 5 shown, taking the car buffer 6 as an example, both the car buffer 6 and the counterweight buffer 7 include a cylinder block 18, a piston rod 19, and a return spring 20 for automatically resetting the piston rod 19; when the car 2 moves to the bottommost layer, the lower end face is in the pit 8 and compresses the car buffer 6; when the car 2 moves to the topmost layer, the lower end face of the counterweight 3 is in the pit 8 and compresses the counterweight buffer 7; a pair of magnets 11 with the same magnetic poles are oppositely arranged between the bottom surface of the car 2 and the upper end surface of the car buffer 6, and between the bottom surface of the counterweight 3 and the upper end surface of the counterweight buffer 7. When approaching each other, they can repel each other, preventing the direct contact between the bottom of the car 2 and the upper end surface of the car buffer 6, and between the bottom of the counterweight 3 and the upper end surface of the counterweight buffer 7, reducing noise, playing a certain protective role for the car buffer 6 and the counterweight buffer 7, and at the same time, the magnets 11 with like poles repelling each other can also play a buffering role; the magnet 11 can be selected from one of a permanent magnet or an electromagnet.

[0025] As Figure 4 , Figure 5As shown in the figure, taking the car buffer 6 as an example, impact limit switches 15 are installed on both the car buffer 6 and the counterweight buffer. Specifically, the impact limit switch 15 includes a switch body A16 fixed to the side of the upper end of the piston rod 19, and a switch plate A17 fixed to the bottom of the car 2 for triggering the switch body A16; the impact limit switch 15 operates respectively when the bottom of the car 2 abnormally impacts and touches the car buffer 6, and the bottom of the counterweight 3 abnormally impacts and touches the counterweight buffer 7, that is, it operates when the car buffer 6 and the counterweight buffer 7 fail, and when the car 2 cannot decelerate at the end station, to achieve further limit buffering; reset limit switches 12 are installed on both the car buffer 6 and the counterweight buffer 7. Specifically, the reset limit switch 12 includes a switch body B13 fixed to the side of the cylinder body 18, and a switch plate B14 fixed to the side of the piston rod 19 for triggering the switch body B13; the reset limit switch 12 operates in the compressed state of the car buffer 6 and the counterweight buffer 7. When it is fully reset, the reset limit switch 12 disconnects, so as to be used to judge whether the car buffer 6 and the counterweight buffer 7 can work normally, that is, whether they can be normally reset after being compressed, and thus the real-time verification of the buffer assembly 5 is realized.

[0026] The present invention reduces the depth of the pit 8, so that when the car 2 descends to the bottom layer once, it can compress the car buffer 6, and when the counterweight 3 descends to the bottom layer once, it can also compress the counterweight buffer 7. Through the feedback of the reset limit switch 12, the real-time verification of the buffer assembly 5 is realized to ensure its normal operation and avoid the failure to play a safety protection role due to the abnormal state of the buffer assembly 5 in case of emergencies; if emergencies occur, such as the failure of the car buffer 6 and the counterweight buffer 7, and the situation that the car 2 cannot decelerate at the end station, the impact limit switch 15 can also operate and play a protective role; at the same time, the reduction of the depth of the pit 8 is also convenient for the construction of the hoistway 1, and the height of the top floor 10 will be relatively reduced.

[0027] The above embodiments are only for illustrating the technical concept and characteristics of the present invention, and their purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. For those skilled in the art, obviously the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention.

Claims

1. An elevator pre-buffering structure, comprising a hoistway, a car installed on the inner side of the hoistway, a counterweight, a traction machine, and a buffering assembly for buffering the car and the counterweight; the hoistway includes a pit, an intermediate running layer, and a top layer in the vertical direction, and the buffering assembly is arranged in the pit and includes a car buffer and a counterweight buffer, and is characterized in that: When the car moves to the bottommost floor, its lower end face is in the pit and compresses the car buffer; when the car moves to the topmost floor, the lower end face of the counterweight is in the pit and compresses the counterweight buffer; a pair of magnets with the same magnetic poles are relatively arranged between the bottom surface of the car and the upper end face of the car buffer, and between the bottom surface of the counterweight and the upper end face of the counterweight buffer; the magnet is selected from one of a permanent magnet or an electromagnet; both the car buffer and the counterweight buffer include a cylinder body, a piston rod, and a return spring for automatically resetting the piston rod. A return limit switch is installed on both the car buffer and the counterweight buffer, and the return limit switch operates in the compressed state of the car buffer and the counterweight buffer. An impact limit switch is installed on both the car buffer and the counterweight buffer, and the impact limit switch operates when a failure occurs in the car buffer and the counterweight buffer, and when the car cannot decelerate at the terminal station.

2. The pre-buffer structure of an elevator according to claim 1, wherein: The impact limit switch includes a switch body A fixed to the side of the upper end of the piston rod, and a switch plate A fixed to the bottom of the car for triggering the switch body A; the return limit switch includes a switch body B fixed to the side of the cylinder body, and a switch plate B fixed to the side of the piston rod for triggering the switch body B.

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