Safety system for an elevator

Abstract

The safety system according to the invention is a safety system for an elevator having a car that moves along a transmission distance by a drive. The safety system includes: a safety circuit for shutting off the drive in an emergency; a progressive safety clamp designed to brake and hold the car in an emergency; and a safety device designed to monitor at least one monitored system of the elevator and to send a safety signal to the safety circuit and the progressive safety clamp in an emergency of the monitored system. The safety device is designed to send the safety signal to the safety circuit in a first step and to send the safety signal to the progressive safety clamp in a second step, after a time interval delay from when the safety signal was sent to the safety circuit.

Description

Technical Field

[0001] This invention relates to a safety system for elevators, used to send safety signals to a safety circuit and a progressive safety clamp when it is safe to do so. Background Technology

[0002] The aforementioned type of safety system is known from the prior art, which simultaneously sends safety signals to both the safety circuit and the progressive safety clamp. Summary of the Invention

[0003] This invention solves the problem of providing an improved security system of the aforementioned type.

[0004] The problem is addressed by a security system of the type mentioned at the beginning, according to the security system described in technical solution 1. Further refinements are indicated in the dependent technical solutions.

[0005] The safety system according to the invention is a safety system for an elevator having a car that moves along a travel distance by a drive. The safety system includes: a safety circuit for shutting off the drive in a safe condition; a progressive safety clamp designed to brake and hold the car in a safe condition; and a safety device designed to monitor at least one monitored system of the elevator and, in a safe condition of the monitored system, to send a safety signal to the safety circuit and the progressive safety clamp. The safety device is designed to send the safety signal to the safety circuit in a first step and to send the safety signal to the progressive safety clamp in a second step, after a time interval delay from when the safety signal was sent to the safety circuit.

[0006] Safety conditions refer to situations where information used for the safe operation of the elevator is missing, invalid, or unacceptable, such as reading errors during position detection.

[0007] The safety circuit may be an electrical safety device conforming to section 5.1.2.1 of standard EN 81-20:2020. If the safety circuit is disconnected, it will prevent the drive mechanism from starting or immediately shut down the drive mechanism.

[0008] [Objective Problem] The safety system according to the present invention can provide the following advantages: passengers in the elevator car can avoid abrupt emergency braking by means of progressive safety clamps, and under appropriate conditions, the elevator can continue to be used without having to call an elevator engineer to release the progressive safety clamps.

[0009] Preferably, the safety device is designed to determine the time interval based on the speed of the car, particularly the speed of the car at the start of a safety situation, and / or based on a fixed speed, particularly the specific trigger speed of the progressive safety clamp.

[0010] This offers the following advantages: the delay is as long as possible, yet still remains within acceptable limits. In this way, the aforementioned advantages can be maximized.

[0011] Preferably, the safety device is designed to send a safety signal to the progressive safety clamp only if the safety condition still applies after the time interval has elapsed.

[0012] This offers the following advantages: emergency braking is not required in this situation, and the aforementioned advantages are achieved.

[0013] Preferably, the first system to be monitored is a position determination system and / or a speed determination system and / or an acceleration determination system, which is used to determine the position and / or speed and / or acceleration of the car along the travel distance.

[0014] Preferably, the safety device is designed to send a safety signal to the progressive safety clamp only if the position determination system does not have a valid position read throughout the entire time interval.

[0015] This offers the advantage that the elevator will not unnecessarily stop when invalid location data only occurs for a negligible period of time.

[0016] Preferably, the safety device is designed to apply if the location determination system no longer performs reliable location determination, particularly if four read errors occur in succession.

[0017] This offers the advantage that the elevator will not unnecessarily stop when invalid location data only occurs for a negligible period of time.

[0018] Preferably, the safety control device is designed to continuously send safety signals until the elevator comes to a stop and no errors have occurred for at least 10 seconds after four consecutive read errors.

[0019] This offers the following advantage: the elevator will not be unnecessarily blocked for extended periods.

[0020] Preferably, a second system to be monitored, which is not a location determination system, is provided, and the safety control is designed to simultaneously send safety signals to the safety circuit and the progressive safety clamp in the event that the second system to be monitored is safe.

[0021] This can provide the following advantages: enabling the system to perform at its best.

[0022] Further features of the invention are shown in the accompanying drawings.

[0023] The advantages of mentioning features separately can also be achieved when combining features with unmentioned features. Attached Figure Description

[0024] Exemplary embodiments of the present invention are shown in the accompanying drawings and explained in more detail below. In the various drawings, the same reference numerals denote corresponding elements. In the drawings: Figure 1 The components of the safety system are shown; Figure 2 A flowchart of the security system is shown. Detailed Implementation

[0025] Figure 1 Components of safety system 10 are shown. The safety system includes a safety device 11, which is connected to safety circuit 13 via signal connection 12 and to progressive safety clamp 15 via signal connection 14, and controls the latter. When the safety device disconnects safety circuit 13, it interrupts the car's movement. When the safety device activates progressive safety clamp 15, the elevator is braked to a stop. The progressive safety clamp is a braking device designed to stop the elevator.

[0026] The absolute position determination system 20 is the first system to be monitored. The absolute position determination system 20 is connected to the safety device 11 via signal connection 21. The safety device 11 monitors the absolute position determination system 20 for the occurrence of invalid position data and controls the safety circuit and progressive safety clamp based on the occurrence of valid or invalid position data.

[0027] The second system under monitoring 30 is connected to the safety device 11 via signal connection 31. The safety device 11 monitors the second system under monitoring 30 for the occurrence of unacceptable data and controls the safety circuit 12 and the progressive safety clamp 15 in a different manner than in the case of the absolute position determination system 20, because it simultaneously activates or deactivates the safety circuit and the progressive safety clamp.

[0028] Figure 2 A flowchart of safety system 10 is shown. When the car is moving, the process sequence begins, in which the safety circuit (SAC) is closed and the progressive safety clamp (SCC) is not activated (40). The position determination system (APS) provides position data (41). This position data is examined to determine whether it is valid or invalid (51).

[0029] In the case of invalid position data, it is determined whether four invalid position data have occurred consecutively (52). If no four invalid position data have occurred consecutively, the process sequence returns to the position determination system (41). If four invalid position data have occurred consecutively, the safety circuit is disconnected. Then it is checked whether a specific time interval has passed (54). As long as the specific time interval has not passed, the process sequence returns to the position determination system (41). However, if the specific time interval has passed, the progressive safety clamp (SCC) is activated (55), causing the elevator car to stop.

[0030] If the position data check (51) finds the position data to be valid, a specific time interval is determined based on the current speed and parameters regarding the progressive safety gear, and the start of the time interval is initiated (61). Then, it is checked whether valid position data has been present for at least ten seconds (62). If valid position data is not consistently obtained within the 10-second time interval, the process sequence returns to the position determination system (41). If valid position data has been present for at least ten seconds, it is checked whether the elevator car has stopped (63). If the elevator car has not stopped, the process returns to the position determination system (41). If the elevator car has stopped, the safety circuit is closed again (64).

[0031] List of reference numerals 10: Security System; 11: Safety devices; 12: Signal connection; 13: Safety circuit; 14: Signal connection; 15: Progressive safety clamp; 20: Location determination system; 21: Signal connection; 30: The second system to be monitored; 41: Signaling device; 40: Start the elevator; 41: Detect the elevator's position; 51: Check if valid location data has been found; 52: Check if invalid location data appears consecutively 4 times; 53: Disconnect the safety circuit; 54: Check if the expected time interval has passed; 55: Activate the progressive safety clamp; 61: Calculate and begin the expected time interval; 62: Has valid location data been available for at least 10 seconds? 63: Check if the elevator has stopped; 64: Close the safety circuit.

Claims

1. A security system, - This safety system is used in elevators, which have cars that move along a travel distance by a drive. The security system - It has a safety circuit, which - Used to shut down the drive in a safe manner. -Features a progressive safety clamp, which is designed to: - Used to brake and hold the car in a safe situation. - It has a safety device, which is designed to: - At least one system to be monitored for monitoring the elevator. -And, in the event that the system under monitoring is safe, it is used to send safety signals to the safety circuit and the progressive safety clamp. Its features are, The safety device is designed for sending -Safety Signal - In the first step, the security signal is sent to the security circuit, and - In the second step, the safety signal is sent to the progressive safety clamp after a time interval following the delay from when the safety signal is sent to the safety circuit.

2. The security system according to any one of the preceding claims, Its features are, -The safety device is designed to be: - The time interval depends on the following: -Depending on the speed of the car, in particular, -At the start of the safety situation, depending on the speed of the car, - and / or depending on a fixed speed, especially - Depends on the specific triggering speed of the progressive safety clamp.

3. The security system according to any one of the preceding claims, Its features are, -The safety device is designed to be: - To send the safety signal to the progressive safety clamp only if the safety condition still applies when the time interval has passed.

4. The security system according to any one of the preceding claims, Its features are, -The first system to be monitored is a position determination system and / or a velocity determination system and / or an acceleration determination system. - It is used to determine the position and / or speed and / or acceleration of the car along the travel distance.

5. The security system according to claim 4, Its features are, -The safety device is designed to be The safety signal is sent to the progressive safety clamp only if the position determination system does not have a valid position read during the entire time interval.

6. The security system according to any one of claims 4 or 5, Its features are, -The safety device is designed to be - The security condition is deemed applicable if any of the following conditions are met: - The location determination system no longer performs reliable location determination. - Specifically, if four read errors occur in succession.

7. The security system according to any one of claims 4 to 6, Its features are, - Safety controls are designed - Continue sending safety signals until the elevator comes to a complete stop and four consecutive read errors have occurred for at least 10 seconds.

8. The security system according to any one of claims 4 to 7, Its features are, - Set up a second system to be monitored, and - Safety controls are designed - In the event that the second system under monitoring is safe, the safety signal is simultaneously sent to the safety circuit and the progressive safety clamp.

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