CN103145016B - A kind of lift car automatic falling-proof holdout device - Google Patents

Abstract

The present invention discloses a kind of lift car automatic falling-proof holdout device, and comprise the steel pipe that symmetry is fixed on elevator shaft wall both sides, steel pipe is provided with ratchet holder, and ratchet holder is provided with holdout device, inhibiting device, contact switch and stops stop device.The present invention can avoid operating personnel in the danger not having to enter under safety control state hoistway, thus reduces potential safety hazard, avoids grave accident to occur.

Description

An elevator car automatic fall prevention device

technical field

The invention relates to the field of elevators, in particular to an automatic anti-fall arresting device for an elevator car.

Background technique

During the maintenance process of the elevator, when the maintenance personnel use the triangular key to open the hall door on the ground floor (because the elevator shaft is generally a bottomless or shallow pit), there is a risk of the car falling or falling when the maintenance personnel enter the shaft. In the current situation, during elevator maintenance, operators generally hang warning signs in eye-catching places outside the hall door or place movable fences outside the entrance and exit of the hall door to isolate the aisle and entrance and exit, but that is a protective measure for elevators with pits or conventional elevator shafts However, there is still no protective facility at the bottom of the bottomless or shallow pit elevator shaft, which cannot effectively guarantee the safety of personnel.

To sum up, aiming at the defects of the prior art, a kind of anti-falling device on the elevator is particularly needed to solve the deficiencies of the prior art.

Contents of the invention

In order to solve the problems of the prior art, the present invention proposes a safe and reliable (additional) "automatic fall prevention device" in the elevator shaft, which can more effectively protect the life safety of the personnel in the shaft. When the maintenance personnel use the triangular key to open the hall door At the same time, start the "automatic fall prevention device" to prevent the car from falling to the bottom.

In order to achieve the above object, the technical solution of the present invention is as follows: an automatic fall prevention device for an elevator car, comprising steel pipes 2 symmetrically fixed on both sides of the elevator shaft wall, the steel pipe 2 is provided with a pawl frame 3, and the pawl frame 3 is provided with a blocking device, a limit switch 15 and a stop switch 4. The blocking device includes a stop tongue 6 fixed on the pawl frame 3 through a rotating shaft 5; The "C" type bracket 7 on the side is provided with an electromagnetic coil 8 inside the "C" type bracket 7, and the lower end of the inner iron core 10 of the electromagnetic coil 8 is movably connected with the rotating shaft 5 through a connecting rod 11, and the inner iron of the electromagnetic coil 8 The upper end of the core 10 is provided with a return spring 12, and the upper end of the return spring 12 is provided with a catch 13 connected to the iron core 10; the stop switch 4 is arranged below the catch 13 and fixed on the pawl frame 3 by bolts upper end;

The limit device includes a limit switch 15 fixed on the pawl frame 3 through a bracket 14 .

According to the technical solution of the present invention, a buffer is provided under the steel pipe to reduce the impact force of the car on the stop tongue.

The beneficial effects of the present invention are: when the device is in a non-working state, the return spring pulls the stop tongue assembly to make the stop tongue in a closed state, and the switch of the hall door is automatically opened or closed by the mechanical force of the car door machine , as long as the "automatic fall prevention device" that does not open the hall door through a contact switch is always in a closed non-working state, it does not affect the normal opening and closing of the elevator and the entry and exit of personnel. The device enters the working state only when the hall door is opened through the contact switch. Professional maintenance personnel use the triangular key to rotate the triangular lock assembly of the hall door. The rotation of the triangular lock assembly drives the contact switch. The current enters the electromagnetic coil through the limit switch in the normally closed state, and pushes the iron core under the action of the magnetic force to make the stop tongue work. State, and make the stop switch cut off the circuit of running elevator. Thereby stopping the operation of the elevator can avoid the danger of operators entering the hoistway without safety guarantee, thereby reducing potential safety hazards and avoiding major accidents.

Description of drawings

Describe the present invention in detail below in conjunction with accompanying drawing and specific embodiment:

Fig. 1 is the front view of anti-falling device of the present invention;

Fig. 2 is the right view of Fig. 1;

Fig. 3 is a use state diagram of the present invention.

Detailed ways

In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

A kind of elevator car automatic anti-fall arresting device as described in Fig. 1 to Fig. 3, comprises the steel pipe 2 that is symmetrically fixed on both sides of elevator hoistway wall, steel pipe 2 is provided with pawl frame 3, and pawl frame 3 is provided with There is a stop device, a limit switch 15 and a stop switch 4, the stop device includes a stop tongue 6 fixed on the pawl frame 3 through a rotating shaft 5; C" type bracket 7, "C" type bracket 7 is provided with an electromagnetic coil 8, the lower end of the inner iron core 10 of the electromagnetic coil 8 is movably connected with the rotating shaft 5 through a connecting rod 11, the inner iron core 10 of the electromagnetic coil 8 The upper end is provided with a return spring 12, and the upper end of the return spring 12 is provided with a catch 13 connected to the iron core 10; the stop switch 4 is arranged below the catch 13 and fixed on the upper end of the pawl frame 3 by bolts;

The limit device includes a limit switch 15 fixed on the pawl frame 3 through a bracket 14 .

The limit device includes a limit switch 15 fixed on the pawl frame 3 through a bracket 14 . The below of steel pipe 2 is provided with buffer 16, is used for reducing the impact force of car to stop tongue.

When the device is in the non-working state, the return spring pulls the stop tongue assembly to make the stop tongue in a closed state. The switch of the hall door is automatically opened or closed by the mechanical force of the car door machine, as long as it is not through the contact The "automatic fall prevention device" that is used to open the hall door is always in a closed non-working state, which does not affect the normal opening and closing of the elevator and the entry and exit of personnel. The device enters the working state only when the hall door is opened through the contact switch. Professional maintenance personnel use the triangular key to rotate the triangular lock assembly of the hall door. The rotation of the triangular lock assembly drives the contact switch. The current enters the electromagnetic coil through the limit switch in the normally closed state, and pushes the iron core under the action of the magnetic force to make the stop tongue work. State, and make the stop switch cut off the circuit of running elevator. Thereby the elevator stops running and can only be in a maintenance state.

The working state of the present invention is that the professional maintenance personnel rotate the hall door contact switch through the special triangular key of the elevator hall door, turn on the contact switch, the current passes through the limit switch, and the electromagnetic coil is connected by the limit switch under the action of electromagnetic force. Pull down the stop tongue on the blocking device and disconnect the elevator running circuit to enter the inspection state, so that the car cannot reach the bottom of the hoistway. After the overhaul is completed, the circuit of the electromagnetic coil is cut off as the hall door is closed, and the stop tongue returns to its original position due to the action of the return spring, and the elevator running circuit is connected, returning to the non-working position, and the elevator enters normal operation. This can avoid the danger of operators entering the well without safety guarantees, thereby reducing potential safety hazards and avoiding major accidents.

Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments, and that described in the above-mentioned embodiments and the description only illustrates the principles of the present invention, and the present invention also has various aspects without departing from the spirit and scope of the present invention. Variations and improvements all fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (2)

1. A kind of elevator car automatic anti-fall arresting device is characterized in that, comprises the steel pipe (2) that symmetrically is fixed on both sides of elevator hoistway wall, steel pipe (2) is provided with ratchet frame (3), ratchet frame ( 3) A blocking device, a limit switch (15) and a stop switch (4) are provided on it, and the blocking device includes a stop tongue (6) fixed on the ratchet frame (3) through a rotating shaft (5); The stop device includes a "C"-shaped support (7) fixed on the side of the pawl frame (3). The "C"-shaped support (7) is provided with an electromagnetic coil (8), and the inner iron of the electromagnetic coil (8) The lower end of core (10) is movably connected with rotating shaft (5) by connecting rod (11), and the upper end of the inner iron core (10) of electromagnetic coil (8) is provided with return spring (12), and the upper end of return spring (12) is provided with There is a baffle (13) connected with the inner iron core (10); The stop switch (4) is arranged under the blocking plate (13) and fixed on the upper end of the pawl frame (3) by bolts; The limit device includes a limit switch (15) fixed on the pawl frame (3) through a bracket (14). 2. A kind of elevator car automatic fall prevention arresting device according to claim 1, is characterized in that, the bottom of steel pipe (2) is provided with buffer (16).