CN218664870U - Elevator safety tongs lifting mechanism - Google Patents

Abstract

The utility model discloses an elevator safety tongs lifting mechanism relates to elevator safety system mechanical structure design field, carry two subsystems of mechanism and constitute by automatically controlled system and the machinery of testing the speed, automatically controlled system of testing the speed is responsible for car speed real-time supervision, can trigger by accurate control safety tongs through setting for the speed threshold value, effectively prevent the malfunction, adopt automatically controlled system of testing the speed, speed trigger is more sensitive than traditional overspeed governor, the cost of avoiding the overspeed governor maintenance simultaneously and the potential safety hazard that the overspeed governor became invalid and bring. The mechanical lifting mechanism is arranged on the side wall of the lift car, the lifting rod is connected with a steel wire rope or a rigid rod of a wedge block of the progressive safety gear in a traction manner, the lifting rod is controlled by an electric control speed measuring system to be connected in a traction manner, the mechanical lifting mechanism directly acts on the safety gear, and the mechanical lifting mechanism has high reliability, universality and interchangeability.

Description

Elevator safety tongs lifting mechanism

Technical Field

The utility model relates to an elevator safety coefficient mechanical structure designs the field, concretely relates to elevator safety tongs draws mechanism.

Background

With the continuous improvement of living standard, the number of high-rise buildings in China is increasing, and the elevator becomes a necessary tool for people to carry in the buildings. The safety of the operation is the focus of attention of people in the process of using the elevator, and the safe riding of the elevator is the basic requirement of the majority of citizens. The safety anti-falling device belongs to the most important component of special equipment, the safety tongs are used as the essential anti-falling device of the elevator, and when the elevator has faults of overspeed, crash and the like, the lift car is emergently stopped on the guide rail, so that accidents are prevented.

At present, the elevator adopts a stall protection device, namely a speed limiter-safety gear system, which monitors and controls the speed of a lift car at any time, and can send out a signal in time when an overspeed condition occurs, namely 115 percent of the rated speed of the elevator, so that mechanical action is generated to cut off a power supply circuit, and a tractor is braked. If the elevator still can not brake, the safety gear arranged at the bottom of the elevator car acts to forcibly stop the elevator car. At present, the speed limiter at home and abroad is structurally changed or is installed at a position, and the action principle of the speed limiter is not obviously innovated.

At present, progressive safety tongs are common, wherein the structure of the progressive safety tongs is shown in the attached drawing 1 (CN 207511631U can also be referred to), safety tong frames 1 are symmetrically installed at the bottoms of two sides of a car, wedge blocks 6 are separated from guide rails 4 when an elevator runs, the wedge blocks 6 are pulled up by a pulling mechanism when the elevator runs over speed, as locking blocks 3 are fixed, the wedge blocks 6 are in contact with the guide rails 4, needle rollers 5 are arranged between the wedge blocks 6 and the locking blocks 3, the pulling resistance is greatly reduced, and the locking blocks 3 are connected to the safety tong frames 1 through C-shaped springs 2, so that the tightness is convenient to connect. At the moment, the safety gear travels through the wedge-shaped self-locking mechanism, the wedge braking force is increased along with the falling of the car, and the car is finally stopped on the elevator guide rail 4 as shown in figure 2. However, the existing lifting mechanism is a speed limiter, and various reasons such as the fact that a centrifugal throwing part of the speed limiter does not work for a long time and is easy to rust, and resistance is increased due to long-term oil shortage of a rotating part cause the fact that a speed limiter-safety gear linkage system cannot work normally, so that safety accidents occur.

Therefore, the safe and reliable lifting mechanism is provided, and has important significance for safe operation of the elevator.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned problem among the prior art, the utility model provides an elevator safety tongs carries and draws mechanism to solve current overspeed governor and carry a great deal of technical problem who draws safety tongs.

The utility model adopts the technical scheme as follows:

a lifting mechanism of elevator safety tongs comprises an electric control speed measuring system and a mechanical lifting mechanism, wherein the mechanical lifting mechanism comprises a lifting rack and a lifting rod assembly, the rack is also provided with a pressing plate, a brake spring, a limiting mechanism and a reset mechanism, and the pressing plate is connected with the lifting rod assembly; the limiting mechanism comprises a driving motor and a limiting structure controlled by the driving motor to move, the driving motor is controlled by an electric signal sent by the electric control speed measuring system, and the limiting structure limits or releases the pressure plate at a fixed position of the compression brake spring; the reset mechanism resets the pressure plate to the fixed position of the compression brake spring.

Preferably, the limiting structure comprises a gear and rack combination which are meshed with each other, the gear is coaxially connected with an output shaft of the driving motor, one end of the rack is connected with a roller bearing, and the roller bearing horizontally moves to compress or release the pressure plate.

More preferably, the driving motor is a stepping motor.

Preferably, the reset mechanism is a lead screw, and the lead screw and the brake spring are respectively located on different sides of the pressure plate.

Preferably, the lead screw is a ratchet wrench and a matched sleeve rotating lead screw.

Preferably, the pressure plate is further provided with a buffer spring, and the buffer spring and the brake spring are respectively positioned on different sides of the pressure plate.

Preferably, the two groups of buffer springs are symmetrically arranged by taking the straight line where the brake spring is located as a central line.

To sum up, compare in prior art, the utility model has the advantages of as follows and beneficial effect:

the utility model provides a carry and draw mechanism to carry by automatically controlled system and machinery and carry two subsystems of mechanism and constitute, the automatically controlled system that tests the speed is responsible for car speed real-time supervision, can trigger by accurate control safety tongs through setting for the speed threshold value, effectively prevents the malfunction, adopts automatically controlled system that tests the speed, and speed trigger is more sensitive than traditional overspeed governor, has avoided the potential safety hazard that cost and the overspeed governor inefficacy that the overspeed governor overhauld simultaneously and brought. The mechanical lifting mechanism is arranged on the side wall of the lift car, the lifting rod is connected with a steel wire rope or a rigid rod of a progressive safety gear wedge block in a traction manner, the lifting rod is controlled by an electric control speed measuring system to be connected in a traction manner, the mechanical lifting mechanism directly acts on the safety gear, and the mechanical lifting mechanism has high reliability, universality and interchangeability.

Drawings

Fig. 1 is a schematic structural diagram of a conventional progressive safety gear driving state;

FIG. 2 is a schematic structural diagram of a conventional progressive safety gear in a braking state;

fig. 3 is a schematic structural view of a mechanical lifting mechanism in a driving state provided in embodiment 1 of the present invention;

fig. 4 is a schematic structural diagram of a braking state of the mechanical lifting mechanism provided in embodiment 1 of the present invention;

fig. 5 is a schematic structural view of a mechanical lifting mechanism in a driving state provided in embodiment 2 of the present invention;

the labels in the figure are respectively: 1. a safety gear frame; 2. a C-shaped spring; 3. a locking block; 4. a guide rail; 5. rolling needles; 6. a wedge block; 7. a stepping motor; 8. lifting the frame; 9. a roller bearing; 10. pressing a plate; 11. a rack; 12. a gear; 13. a brake spring; 14. a lifting rod assembly; 15. a buffer spring; 16. and a lead screw.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the described embodiments are only some, but not all embodiments of the invention.

The elevator safety tong pulling mechanism provided by the embodiment comprises an electric control speed measuring system and a mechanical pulling mechanism, wherein the electric control speed measuring system is a mature speed measuring system in the prior art, such as a single-shaft acceleration sensor speed measuring system, and only needs to be capable of measuring speed and transmitting an electric signal; the mechanical pulling mechanism is as shown in examples 1 and 2.

Example 1

As shown in fig. 3, a schematic structural diagram of a mechanical lifting mechanism in a driving state provided in embodiment 1 of the present invention is shown:

the concrete structure is as follows: the lifting frame 8 is installed at the top end of the side wall of the car, a pressing plate 10 is arranged at the middle position of the lifting frame 8, a reset mechanism and a limiting mechanism are arranged above the pressing plate 10, and a brake spring 13 and a lifting rod assembly 14 are arranged below the pressing plate 10. The limiting mechanism comprises a stepping motor 7, a gear 12 coaxially connected with an output shaft of the stepping motor 7, a rack 11 meshed with the gear 12, and a roller bearing 9 fixed with the rack 11.

The working principle is as follows: when the elevator is running, the roller bearing 9 is positioned on the upper end surface of the pressure plate 10, and the brake spring 13 is in a compressed state. When the lift car runs at an overspeed, the electric control speed measuring system sends a signal to control the stepping motor 7 to drive the gear 12 to rotate, and the rack 11 translates along with the gear 12 in a direction away from the symmetrical section of the system. When the roller bearing 9 leaves the lifting frame 8, the brake spring 13 bounces upwards to drive the lifting rod assembly 14 to translate upwards. The lifting rod assembly 14 is connected with the safety gear wedge block 6 at the bottom of the car through a steel wire rope or a rigid rod, the safety gear wedge block 6 is driven to lift up, the safety gear wedge block 6 contacts the guide rail 4 to complete braking, and at the moment, as shown in fig. 4, the mechanical lifting mechanism is in a braking state. When the lifting mechanism needs to be reset, the reset mechanism pushes the pressing plate 10 to enable the brake spring 13 to be in a compressed state, and the stepping motor 7 is controlled to enable the roller bearing 9 to be pressed on the upper end face of the pressing plate 10 again to complete the reset action.

In this embodiment, the reset mechanism may be an oil cylinder, an air cylinder, or a lead screw, as long as the pressing plate 10 can be pressed to make the brake spring 13 in a compressed state.

Example 2

As shown in fig. 5, the mechanical pulling mechanism of the present embodiment is further improved on the basis of embodiment 1: the resetting mechanism adopts a ratchet wrench and a matched sleeve to rotate the lead screw 16, so that the convenience of mounting the lifting mechanism and resetting the brake spring is improved, the length of the lead screw just meeting the requirement of compressing the brake spring is selected, nearly half of materials are saved, and the overall weight of the lifting mechanism is further reduced.

A group of buffer springs 15 matched with the brake springs are adopted, so that the acceleration of the lifting mechanism in the acceleration stage in the lifting process is reduced on the basis of only the brake springs 13, the acceleration of the lifting mechanism in the deceleration stage in the lifting process is increased, and the effect of reducing the impact during the lifting of the safety tongs is achieved. And the buffer springs 15 are arranged in two groups and are symmetrically arranged by taking the straight line where the brake springs are located as a central line, so that the structural stability is ensured. Compared with the embodiment 1, the embodiment can effectively prevent the lifting mechanism from generating overlarge lifting force, reduces the whole weight of the lifting mechanism, and simultaneously relatively prolongs the service life of the safety gear.

The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which are all within the protection scope of the present application.

Claims (7)

1. The elevator safety gear lifting mechanism is characterized by comprising an electric control speed measuring system and a mechanical lifting mechanism, wherein the mechanical lifting mechanism comprises a lifting rack and a lifting rod assembly, a pressing plate, a brake spring, a limiting mechanism and a reset mechanism are further arranged on the rack, and the pressing plate is connected with the lifting rod assembly; the limiting mechanism comprises a driving motor and a limiting structure controlled by the driving motor to move, the driving motor is controlled by an electric signal sent by an electric control speed measuring system, and the limiting structure limits or releases the pressure plate at a fixed position of the compression brake spring; the reset mechanism resets the pressure plate to the fixed position of the compression brake spring.

2. The elevator safety gear lifting mechanism according to claim 1, wherein the limiting structure comprises a combination of a gear and a rack which are engaged with each other, the gear is coaxially connected with an output shaft of the driving motor, one end of the rack is connected with a roller bearing, and the roller bearing horizontally moves to compress or release the pressure plate.

3. The elevator safety gear lifting mechanism according to claim 1 or 2, wherein the drive motor is a stepper motor.

4. The elevator safety gear lifting mechanism according to claim 1, wherein the return mechanism is a lead screw, and the lead screw and the brake spring are respectively located on different sides of the pressure plate.

5. The elevator safety gear lifting mechanism of claim 4, wherein the lead screw is a ratchet wrench and a mating socket rotation lead screw.

6. The elevator safety gear lifting mechanism according to claim 1, wherein the pressure plate is further provided with a buffer spring, and the buffer spring and the brake spring are respectively positioned on different sides of the pressure plate.

7. The elevator safety gear lifting mechanism according to claim 6, wherein the buffer springs are provided in two groups and are symmetrically arranged with respect to a center line on which the brake spring is located.

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