Active safety buffer device for elevators

Abstract

An elevator active safety buffer device, comprising an elevator car, the bottom of the elevator car is provided with several buffer supports which can be converted between a folded state and an unfolded state; the elevator car is provided with a drive mechanism for controlling the buffer supports to maintain the folded state or the unfolded state, and a controller for controlling the drive mechanism to work according to the overspeed descending speed of the elevator car. When the controller learns that the elevator car is descending at an overspeed, the controller controls the drive mechanism to release the buffer supports, the buffer supports are unfolded downward under the action of gravity and the elastic force of the drive spring until being vertically arranged, and the unfolded buffer supports are in contact with the bottom of the pit in advance to buffer, so as to reduce the overspeed descending speed and the impact force of the elevator car, and the buffer supports can be combined with the in-pit buffer in the pit to buffer and dampen, so as to realize the purpose of double buffering and damping and ensure the safety of passengers.

Description

Technical Field

[0001] This invention relates to the field of elevator technology, and specifically to an active safety buffer device for elevators. Background Technology

[0002] Currently, elevators are used very frequently in daily life, and malfunctions are inevitable during operation, such as rapid falls. When existing elevators encounter malfunctions and experience rapid falls, although the buffers in the pit can cushion the impact of the elevator car descending at excessive speed, the impact force on the buffers in the pit is still relatively large. This causes the buffers in the pit to be quickly compressed to their limit after the bottom of the elevator car contacts the buffer, resulting in excessive instantaneous impact force and ineffective shock absorption. This leads to poor safety performance and fails to meet current usage requirements. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides an active safety buffer device for elevators.

[0004] The technical solution adopted by this invention to solve its technical problem is:

[0005] An active safety buffer device for elevators includes an elevator car, characterized in that: the bottom of the elevator car is provided with a plurality of buffer supports that can switch between a folded state and an unfolded state, the buffer supports being composed of a buffer base rotatably mounted on the elevator car and a car bottom buffer mounted on the buffer base; the elevator car is provided with a drive mechanism for controlling the buffer supports to maintain a folded state or an unfolded state, and a controller that can control the operation of the drive mechanism according to the overspeed descent speed of the elevator car.

[0006] In this invention, the elevator car is equipped with a speed sensor that is communicatively connected to the controller.

[0007] In this invention, the buffer base is provided with a connecting shaft seat, and a rotatable mounting shaft is inserted through the connecting shaft seat. The bottom of the elevator car is provided with a mounting base, and the mounting base is provided with two mounting shaft seats. The mounting shaft is rotatably connected to the mounting shaft seats.

[0008] In this invention, an elastic spacer is provided between the mounting base and the mounting shaft.

[0009] In this invention, the mounting shaft seat is provided with a mounting through hole, the elastic spacer is inserted into the mounting through hole, and the inner ring of the elastic spacer is a mating through hole for the mounting shaft to pass through.

[0010] In this invention, the driving mechanism includes a driving spring for driving the buffer bracket to unfold and maintain the unfolded state, and a buffer locking mechanism for keeping the buffer bracket in a folded state. One end of the driving spring is connected to the mounting base, and the other end is connected to the buffer base. The buffer locking mechanism is fixed to the bottom of the elevator car, and the buffer base is provided with a locking engagement block for cooperating with the working end of the buffer locking mechanism.

[0011] In this invention, the buffer locking mechanism includes a mounting base fixed to the bottom of the elevator car, an electric push rod fixed on the mounting base, and an elastic abutment head installed on the telescopic end of the electric push rod. The electric push rod is electrically connected to the controller, and the elastic abutment head is the working end of the buffer locking mechanism.

[0012] In this invention, the bottom of the elevator car is provided with a pressure-bearing base, the bottom surface of the pressure-bearing base is a pressure-bearing plane, and the end of the buffer base away from the bottom buffer is provided with a mating plane for cooperating with the pressure-bearing plane.

[0013] The beneficial effects of this invention are as follows: This invention provides a buffer bracket and a drive mechanism at the bottom of the elevator car. The drive mechanism is used to control the buffer bracket to remain in a folded or unfolded state. When the controller detects that the elevator car is descending at excessive speed, the controller controls the drive mechanism to release the buffer bracket. Under the action of gravity and the elastic force of the drive spring, the buffer bracket flips and unfolds downward until it is set vertically. During the excessive descent of the elevator car, the buffer bracket is kept in the unfolded state to contact the bottom of the pit in advance for buffering, thereby reducing the excessive descent speed of the elevator car and reducing the impact force of the excessive descent. This allows the buffer bracket to combine with the pit buffer in the pit for buffering and shock absorption, achieving the purpose of double buffering and shock absorption, and ensuring the safety of passengers. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0015] Figure 1 This is a schematic diagram of the structure of this embodiment;

[0016] Figure 2 for Figure 1 Enlarged view of I in the middle;

[0017] Figure 3 This is a schematic diagram of the buffer support in its deployed state;

[0018] Figure 4 Schematic diagram of the combination of buffer bracket and mounting base Figure 1 ;

[0019] Figure 5 Schematic diagram of the combination of buffer bracket and mounting base Figure 2 . Detailed Implementation

[0020] 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.

[0021] Reference Figure 1-5 An active safety buffer device for elevators includes an elevator car 1. The bottom of the elevator car 1 is provided with several buffer supports 2 that can switch between a folded state and an unfolded state. When the buffer supports 2 are installed on the bottom of the elevator car 1, the position of the buffer supports 2 is offset from the position of the buffer in the pit of the shaft, so as to avoid the buffer supports 2 colliding with the buffer in the pit. Moreover, in actual application, the height of the buffer supports 2 after unfolding is greater than the height of the buffer in the pit of the shaft, and the buffer stroke of the car bottom buffer 22 is greater than the buffer stroke of the buffer in the pit, so that the buffer supports 2 can perform buffering in advance.

[0022] In this embodiment, the buffer bracket 2 consists of a buffer base 21 rotatably mounted on the elevator car 1 and a car bottom buffer 22 mounted on the buffer base 21. Furthermore, the car bottom buffer 22 and the pit buffer are any one of the conventional hydraulic buffers, polyurethane buffers, or spring buffers used in the existing elevator industry. Preferably, the car bottom buffer 22 is a polyurethane buffer, which is bolted to the buffer base 21.

[0023] In this embodiment, the elevator car 1 is equipped with a drive mechanism 3 for controlling the buffer support 2 to remain in a folded or unfolded state, and a controller 4 that controls the operation of the drive mechanism 3 according to the descent speed of the elevator car 1. The drive mechanism 3 is connected to the buffer base 21, and the controller 4 is electrically connected to the drive mechanism 3. Furthermore, the elevator car 1 is equipped with a speed sensor 8 that is communicatively connected to the controller 4. The speed sensor 8 is used to detect the running speed of the elevator car 1, and the speed sensor 8 is connected to the controller 4 through the elevator control system. Both the controller 4 and the speed sensor 8 are bolted to the elevator car 1.

[0024] In this embodiment, the buffer base 21 is provided with a connecting shaft seat 211, through which a rotatable mounting shaft 23 is inserted. The bottom of the elevator car 1 is provided with a mounting base 5, on which two mounting shaft seats 51 are provided. The mounting shaft 23 is rotatably connected to the mounting shaft seats 51. To prevent the mounting shaft 23 from detaching from the mounting base 5, one end of the mounting shaft 23 has a protruding anti-detachment protrusion 231, and the other end has an anti-detachment pin, which is a cotter pin. The other end of the mounting shaft 23 has a pin hole 232 into which the anti-detachment pin is inserted.

[0025] In this embodiment, to prevent a violent collision between the mounting shaft 23 and the mounting base 5 caused by the impact force generated by the buffer bracket 2 during buffering use, an elastic spacer 6 is provided between the mounting base 5 and the mounting shaft 23 for buffering. Specifically, the mounting shaft seat 51 has a mounting through hole, and the elastic spacer 6 is inserted into the mounting through hole. The inner ring of the elastic spacer 6 is a mating through hole for the mounting shaft 23 to pass through. The elastic spacer 6 is made of polyurethane, which has high wear resistance, buffering performance, and service life. At the same time, it can buffer the impact force generated by the buffer bracket 2, preventing the impact force generated by the buffer bracket 2 from having an excessive impact on the mounting shaft 23.

[0026] In a preferred embodiment, the driving mechanism 3 includes a driving spring 31 for driving the buffer support 2 to unfold and maintain its unfolded state, and a buffer locking mechanism 32 for maintaining the buffer support 2 in a folded state. One end of the driving spring 31 is connected to the mounting base 5, and the other end is connected to the buffer base 21. The buffer locking mechanism 32 is fixed to the bottom of the elevator car 1. The buffer base 21 is provided with a locking engagement block 212 for cooperating with the working end of the buffer locking mechanism 32. The locking engagement block 212 is installed on the buffer base 21 by bolt connection. When the working end of the buffer locking mechanism 32 abuts against the locking engagement block 212, the buffer support 2 remains in a folded state and is stored at the bottom of the elevator car 1. When the working end of the buffer locking mechanism 32 leaves the locking engagement block 212, the buffer support 2, under the action of gravity and the elastic force of the driving spring 31, flips downward and unfolds until it is vertically set, thereby keeping the buffer support 2 in an unfolded state for buffering.

[0027] In this embodiment, the drive spring 31 is a torsion spring, which is mounted on the mounting shaft 23. One of the torsion spring's torsional feet abuts against the locking block 212 of the buffer base 21, and the other torsional foot abuts against the mounting base 5. The installation structure of the torsion spring is simple and convenient, which helps to reduce the installation cost of the drive spring 31.

[0028] In this embodiment, the buffer locking mechanism 32 includes a mounting base 321 fixed to the bottom of the elevator car 1 with bolts, an electric push rod 322 fixed to the mounting base 321 with bolts, and an elastic abutment head 323 installed on the telescopic end of the electric push rod 322. The electric push rod 322 is electrically connected to the controller 4. The elastic abutment head 323 is fitted onto the telescopic end of the electric push rod 322, and the elastic abutment head 323 and the telescopic end of the electric push rod 322 are connected by bolts. The elastic abutment head 323 is the working end of the buffer locking mechanism 32. The elastic abutment head 323 is elastic, so it can buffer the impact force generated by the buffer bracket 2 when the elevator car 1 moves up and down, and avoid the impact force generated by the buffer bracket 2 from having too great an impact on the electric push rod 322. The elastic abutment head 323 is made of polyurethane, which has high wear resistance, buffer performance and long service life.

[0029] In a preferred embodiment, the bottom of the elevator car 1 is provided with a pressure-bearing base 7, which is fixed to the bottom of the elevator car 1 by bolt connection. The bottom surface of the pressure-bearing base 7 is a pressure-bearing plane. The end of the buffer base 21 away from the bottom buffer 22 is provided with a mating plane for cooperating with the pressure-bearing plane. When the buffer support 2 is unfolded to a vertical position, the mating plane is attached to the pressure-bearing plane, so that the pressure-bearing base 7 supports the buffer support 2 and disperses the impact stress of the buffer support 2, ensuring the stability of the buffer.

[0030] Normally, the buffer bracket 2 is folded. When the controller 4 detects that the elevator car 1 is descending at excessive speed, the controller 4 controls the working end of the buffer locking mechanism 32 to disengage from the locking block 212, releasing the buffer bracket 2. Under the action of gravity and the elastic force of the drive spring 31, the buffer bracket 2 flips downward and unfolds into a vertical position, switching the buffer bracket 2 to the unfolded state for buffering. This allows the buffer bracket 2 to contact the bottom of the pit earlier during the descent of the elevator car 1, thereby reducing the descent speed of the elevator car 1 and preventing the elevator car 1 from violently colliding with the buffer in the pit, thus reducing the impact force. In addition, a buffer bearing plate corresponding to the buffer bracket 2 can be installed in the pit to disperse the impact stress of the buffer bracket 2 for buffering.

[0031] The above description is only a preferred embodiment of the present invention. Any technical solution that achieves the purpose of the present invention by essentially the same means is within the protection scope of the present invention.

Claims

1. An active safety buffer device for an elevator, comprising an elevator car (1), characterized in that: The bottom of the elevator car (1) is provided with several buffer supports (2) capable of being converted between a folded state and an unfolded state, the buffer support (2) is composed of a buffer base (21) rotatably mounted on the elevator car (1) and a car bottom buffer (22) mounted on the buffer base (21), when the buffer support (2) is mounted on the bottom of the elevator car (1), the position of the buffer support (2) is staggered with the position of the pit buffer in the pit of the shaft pit, the height of the unfolded buffer support (2) is greater than the height of the pit buffer in the pit of the shaft pit, the buffer stroke of the car bottom buffer (22) is greater than the buffer stroke of the pit buffer; the elevator car (1) is provided with a driving mechanism (3) for controlling the buffer support (2) to remain in the folded state or the unfolded state, and a controller (4) capable of controlling the driving mechanism (3) to work according to the descending speed of the elevator car (1); the elevator car (1) is provided with a speed sensor (8) in communication connection with the controller (4); The driving mechanism (3) includes a driving spring (31) for driving the buffer support (2) to unfold and remain in the unfolded state, and a buffer locking mechanism (32) for keeping the buffer support (2) in the folded state, one end of the driving spring (31) is connected with the mounting base (5), and the other end is connected with the buffer base (21); the buffer locking mechanism (32) is fixed on the bottom of the elevator car (1), and the buffer base (21) is provided with a locking matching block (212) for cooperating with the working end of the buffer locking mechanism (32); When the working end of the buffer locking mechanism (32) abuts against the locking matching block (212), the buffer support (2) remains in the folded state and is accommodated in the bottom of the elevator car (1); Under normal circumstances, the buffer support (2) is in the folded state; when the controller (4) learns that the elevator car (1) is descending at a high speed, the controller (4) controls the working end of the buffer locking mechanism (32) to move away from the locking matching block (212) and release the buffer support (2), the buffer support (2) is unfolded vertically under the action of gravity and the elastic force of the driving spring (31), so that the buffer support (2) is switched to the unfolded state for buffering.

2. An active safety buffer device for elevators according to claim 1, characterized in that: The buffer base (21) is provided with a connecting shaft seat (211), the connecting shaft seat (211) penetrates a rotatable mounting shaft (23), the bottom of the elevator car (1) is provided with a mounting base (5), the mounting base (5) is provided with two mounting shaft seats (51), and the mounting shaft (23) is rotatably connected to the mounting shaft seats (51).

3. An active safety buffer device for elevators according to claim 2, characterized in that: An elastic spacer sleeve (6) is arranged between the mounting base (5) and the mounting shaft (23).

4. An active safety buffer device for elevators according to claim 3, characterized in that: The mounting shaft seat (51) is provided with a mounting through hole, the elastic spacer sleeve (6) is inserted into the mounting through hole, and the inner ring of the elastic spacer sleeve (6) is a matching through hole for the mounting shaft (23) to pass through.

5. An active safety cushioning device for elevators as defined in claim 1, characterized in that The buffer locking mechanism (32) comprises a mounting base (321) fixed at the bottom of the elevator car (1), an electric push rod (322) fixed on the mounting base (321), and an elastic abutting head (323) mounted on the telescopic end of the electric push rod (322), wherein the electric push rod (322) is electrically connected with the controller (4), and the elastic abutting head (323) is the working end of the buffer locking mechanism (32).

6. An active safety buffer device for elevators according to any one of claims 1-5, characterized in that: The bottom of the elevator car (1) is provided with a pressure bearing base (7), the bottom surface of the pressure bearing base (7) is a pressure bearing plane, and the buffer base (21) is provided with a matching plane used for matching the pressure bearing plane at the end away from the car bottom buffer (22).

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