CN101445199B - Elevator speed limiter trigger mechanism - Google Patents

Abstract

The invention discloses an elevator governor trigger mechanism. The elevator governor trigger mechanism comprises a governor, a centrifugal block and a sheave which are arranged on the governor and rotate synchronously, a rotating shaft arranged on the governor, and a clamp plate arranged on the governor by the rotating shaft, the maximum centrifugal position of the centrifugal block corresponds to the end position of the clamp plate; and the trigger mechanism further comprises a first speed limiting switch and a second speed limiting switch, the clamp plate has three states (upright standing, forward tilting and backward tilting) while rotating around the rotating shaft, when the clamp plate stands upright, the end position thereof corresponds to the first speed limiting switch, and when the clamp plate tilts forwards, the end position thereof corresponds to the second speed limiting switch. The trigger time of the two speed limiting switches is easily controlled to ensure that the governor rotates forwards to trigger two limit switches and rotates backwards to trigger one limit switch, thus improving the safety of an elevator.

Description

Elevator speed limiter trigger mechanism

technical field

The invention belongs to the field of elevators, and in particular relates to a trigger mechanism for an elevator speed governor.

Background technique

The current speed limiter is equipped with a sheave and a centrifugal block. When the elevator is running, the wire rope drives the sheave to rotate, and the sheave drives the centrifugal block to rotate. If the speed is too high, the centrifugal block will separate radially outward. When the centrifugal block When the maximum centrifugal position is reached, the speed limit switch on the speed limiter is triggered, but only one trigger signal is generated when it is triggered. If two trigger signals need to be generated, the existing method is to install two speed limiters on the speed limiter. The two speed limit switches are separated by a certain distance, but in the existing structure, if the positions of the two speed limit switches are slightly improper, simultaneous triggering or wrong triggering sequence will occur. , the two limit switches may both be triggered, causing the elevator up and down overspeed safety devices to act simultaneously, which may cause the elevator to stop and decelerate too much, which does not meet the mandatory safety requirements of the national standard.

Contents of the invention

The purpose of the present invention is to provide a trigger mechanism for the speed limiter of an elevator. The present invention can generate two trigger signals, and the two trigger signals are separated by a certain time. When the speed limiter rotates forward, the two signals are triggered, and the speed limiter reverses. Triggering a signal can meet the mandatory safety requirements of national standards.

The present invention is achieved through the following technical solutions:

A trigger mechanism for an elevator overspeed governor, comprising a overspeed governor on which a synchronously rotating centrifugal block and a sheave are arranged, a rotating shaft is arranged on the overspeed governor, a pressing plate is installed on the overspeed governor through the rotating shaft, and the centrifugal block The maximum centrifugal position corresponds to the position of the end of the pressure plate. The trigger mechanism also includes a first speed limit switch and a second speed limit switch. When the pressure plate rotates around the shaft, there are three states: upright, forward dumping, and reverse dumping. When the pressing plate is upright, its end position corresponds to the position of the first speed limiting switch, and when the pressing plate is tilted forward, its end position corresponds to the position of the second speed limiting switch.

In the present invention, if the speed of the elevator is too fast, when the speed limiter rotates forward, the centrifugal block will first trigger the first speed limit switch in the vertical position under the action of centrifugal force, and send the first trigger signal to the elevator control system, and then the pressure plate will move to the elevator control system. The speed limiter falls in the direction of forward rotation, and triggers the second speed limit switch at the position where the pressure plate is dumped, and sends a second trigger signal to the elevator control system; The first speed limit switch is triggered to send the first trigger signal to the elevator control system, and then the pressure plate falls in the reverse direction of the speed limiter, and the second speed limit switch cannot be triggered. It can be seen that the present invention can generate two triggers signal, and there is a certain time interval between the two trigger signals, and the interval time is the time required for the pressing plate during the dumping process. Compared with the structure directly triggered by the centrifugal block in the prior art, the two speed limit switches trigger The time interval is easy to control, and the second limit switch is installed in the forward direction of the speed limiter to ensure that the two limit switches cannot be triggered at the same time when the speed limiter reverses, so that the safety of the elevator is improved.

A further improvement of the present invention is:

The second limit switch includes a trigger part (such as a rotating arm, a contact, etc.), and when the pressure plate is tilted forward, the position of the end thereof corresponds to the position of the trigger part.

An indenter is arranged at the end of the pressing plate, and a boss is arranged on the centrifugal block. At the maximum centrifugal position of the centrifugal block, the boss corresponds to the position of the indenter.

The first speed limit switch is arranged directly above the rotating shaft, and when the pressure plate is erected, the pressure head at the end thereof presses on the first speed limit switch.

Description of drawings

Fig. 1 is the state diagram of the present invention before triggering;

Fig. 2 is a partial side view of Fig. 1;

Fig. 3 is in the present invention, the forward rotation state diagram after speed limiter triggers;

Fig. 4 is a partial side view of Fig. 3;

Fig. 5 is a reverse state diagram after the speed limiter is triggered in the present invention;

Explanation of reference signs:

1. Speed limiter, 2. Centrifugal block, 3. Sheave, 4. Rotating shaft, 5. Pressure plate, 6. First speed limit switch, 7. Second speed limit switch, 8. Trigger arm, 9. Pressure head , 10, boss.

Detailed ways

As shown in Figures 1 to 4, a trigger mechanism for an elevator overspeed governor includes a overspeed governor 1 on which a synchronously rotating centrifugal block 2 and a sheave 3 are arranged. The rotating shaft 4 and the pressing plate 5 are installed on the speed limiter 1 through the rotating shaft 4. The maximum centrifugal position of the centrifugal block 2 corresponds to the position of the end of the pressing plate 5. The trigger mechanism also includes a first speed limiting switch 6, a second speed limiting Switch 7, when the pressing plate 5 rotates around the rotating shaft 4, there are three states of erection, positive dumping, and reverse dumping. When the pressing plate 5 is erected, its end position corresponds to the position of the first speed limit switch 6. When dumping forward, its end position corresponds to the position of the second speed limit switch 7 .

Wherein, an indenter 9 is provided at the end of the pressing plate 5, and a boss 10 is provided on the centrifugal block 2. At the maximum centrifugal position of the centrifugal block 2, the boss 10 corresponds to the position of the indenter 9; the first limit The speed switch 6 is located directly above the rotating shaft 4, and when the pressing plate 5 was erected, the pressure head 9 at its end was pressed on the first speed limit switch 6; the second speed limit switch 7 includes a trigger part (in this embodiment, The trigger part is the trigger arm 8), and when the pressing plate 5 is tilted forward, the position of its end corresponds to the position of the trigger arm 8.

The status before triggering is shown in Figure 1 and Figure 2. If the speed of the elevator is too fast during operation, when the speed limiter is rotating forward, the centrifugal block 2 will pass the first limiter 1 through the boss 10 in the vertical position under the action of centrifugal force. The speed switch 6 is triggered to send the first trigger signal to the elevator control system, and then the pressure plate 5 falls in the forward direction of the speed limiter, as shown in Figure 3 and Figure 4, and triggers the second speed limit switch at the position where the pressure plate falls 7. Send the second trigger signal to the elevator control system. When the speed limiter 1 reverses, the centrifugal block 2 will trigger the first speed limit switch 6 in the vertical position under the action of centrifugal force, as shown in Figure 5, to the elevator control The system sends out the first trigger signal, and then the pressure plate 5 falls in the reverse direction of the speed limiter 1, and the second speed limit switch 7 cannot be triggered. It can be seen that the forward rotation of this embodiment can generate two trigger signals, and the two There is a certain time interval between the trigger signals, and the interval time is the time required for the pressing plate 5 during the dumping process. The time interval between the triggering of the two speed limit switches is easy to control. When the speed limiter reverses, because the second limit switch 7 is installed In the forward rotation direction of the speed limiter 1, it is ensured that the two limit switches cannot be triggered at the same time when the speed limiter 1 reverses, so that the safety of the elevator is improved.

Claims (4)

1. A trigger mechanism for an elevator overspeed governor, comprising a overspeed governor, on which a synchronously rotating centrifugal block and a sheave are arranged, characterized in that the overspeed governor is provided with a rotating shaft, and the pressing plate is installed on the overspeed governor through the rotating shaft On the speed controller, the maximum centrifugal position of the centrifugal block corresponds to the position of the end of the pressure plate. The trigger mechanism also includes a first speed limit switch and a second speed limit switch. There are three states of tilting. When the pressure plate is upright, its end position corresponds to the position of the first speed limit switch. When the pressure plate is tilting forward, its end position corresponds to the position of the second speed limit switch. 2. The triggering mechanism of the elevator overspeed governor according to claim 1, wherein the second limit switch includes a triggering part, and when the pressing plate is tilted forward, its end position corresponds to the position of the triggering part . 3. As the trigger mechanism of the elevator speed governor according to claim 1 or 2, it is characterized in that a pressure head is provided at the end of the pressure plate, a boss is provided on the centrifugal block, and the maximum centrifugal force of the centrifugal block position, the boss corresponds to the position of the indenter. 4. The triggering mechanism of the elevator speed limiter according to claim 3, wherein the first speed limit switch is arranged directly above the rotating shaft, and when the pressure plate is erected, the pressure head at its end is pressed against the said rotating shaft. On the first speed limit switch.

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