Elevator and elevator protection system

Abstract

The utility model discloses an elevator and an elevator protection system. The elevator protection system comprises an elevator operation loop, wherein a normally closed relay switch is connected in series in the elevator operation loop; the limiting loop comprises a travel switch and a speed limiter coil which are connected in series, and the travel switch is a normally-closed switch; the detection device comprises a detection relay coil connected in the limiting loop in series, and the potentials of the detection relay coil, the speed limiter coil and the travel switch in the limiting loop are gradually reduced; the detection device further comprises a control module used for obtaining the potential difference between the two ends of the relay coil under the condition that the elevator is powered on, and the control module is in signal connection with the relay switch so as to control on-off of the relay switch according to the potential difference. The safety and maintainability of the elevator can be improved.

Description

Technical Field

[0001] The present application relates to the field of elevator safety technology, and in particular to an elevator and an elevator protection system. Background Art

[0002] Modern elevator control systems typically employ direct monitoring of the elevator's speed or position to ensure safe operation. These systems typically rely on independent speed sensors or position detectors to collect elevator operating parameters in real time and transmit the data to a controller for analysis. Upon detecting a speed or position anomaly, the controller immediately shuts off the elevator's power supply or triggers the brakes through actuators, preventing accidents. Existing technologies rely on a high degree of system integration and precision sensors, making maintenance more difficult. Frequent sensor failures can reduce system reliability and, consequently, elevator safety, particularly in harsh environments. Utility Model Content

[0003] The purpose of the embodiments of the present application is to provide an elevator and an elevator protection system to solve the problem of low safety of elevator protection systems in the prior art.

[0004] In order to achieve the above objectives, the present application provides, in a first aspect, an elevator protection system, comprising:

[0005] Elevator operation circuit, in which a normally closed relay switch is connected in series;

[0006] The limit circuit includes a travel switch and a speed limiter coil connected in series, and the travel switch is a normally closed switch;

[0007] The detection device includes a detection relay coil connected in series in the limit circuit, and the potential of the detection relay coil, the speed limiter coil and the travel switch in the limit circuit gradually decreases;

[0008] The detection device also includes a control module for obtaining the potential difference between the two ends of the detection relay coil when the elevator is powered on. The control module is connected to the relay switch signal to control the relay switch to be on and off according to the size of the potential difference.

[0009] In an embodiment of the present application, the detection device further includes a power supply module, which is electrically connected to the detection relay coil, and the output current type of the power supply module is direct current or alternating current.

[0010] In the embodiment of the present application, the type of current flowing through the speed limiter coil is direct current or alternating current, and the output current type of the power module is consistent with the type of current flowing through the speed limiter coil.

[0011] In the embodiment of the present application, the equivalent resistance of the speed governor coil is 12 ohms and the equivalent resistance of the detection relay coil is 640 ohms when the output current type of the power module is direct current.

[0012] In the embodiment of the present application, the equivalent resistance of the speed governor coil is 314.3 ohms and the equivalent resistance of the detection relay coil is 14500 ohms when the output current type of the power module is alternating current.

[0013] In the embodiment of the present application, the control module is further configured to control the relay switch to be powered off when the potential difference is less than the preset safety threshold.

[0014] In the embodiment of the present application, the system further comprises an alarm device electrically connected to the relay switch, configured to send an alarm information when the relay switch is powered off.

[0015] In the embodiment of the present application, the travel switch comprises a first travel switch and a second travel switch connected in parallel with the first travel switch, configured to form a redundant travel switch of the first travel switch.

[0016] The second aspect of the present application provides an elevator comprising the elevator protection system.

[0017] According to the above technical solution, the detection relay coil, the speed governor coil and the travel switch are connected in series, and the elevator running loop and the relay switch are connected in series. When the speed governor coil senses that the elevator speed is too fast, the speed governor coil and / or the travel switch are open-circuited, causing the limit loop to be open-circuited. The control device senses the open-circuit of the limit loop and controls the relay switch to be powered off. Or, the control device controls the relay switch to be powered off when the potential difference between the two ends of the detection relay coil is lower than the preset safety threshold, so as to protect the main running loop of the elevator, thereby improving the safety of the elevator.

[0018] Other features and advantages of the embodiments of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings are included to provide a further understanding of the embodiments of the present application, and constitute a part of the specification, and are used together with the following specific embodiments to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. In the drawings:

[0020] Figure 1 The structure diagram of the elevator protection system according to the embodiment of the present application is schematically shown. DETAILED DESCRIPTION

[0021] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. It should be understood that the specific implementation described herein is only used to explain and illustrate the embodiments of the present application, and is not used to limit the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0022] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, motion condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0023] In addition, if the embodiments of the present application involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize it, and when the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist and is not within the scope of protection claimed by the present application.

[0024] Figure 1 A structural diagram of an elevator protection system according to an embodiment of the present application is schematically shown. As shown in Figure 1 The structural diagram of the elevator protection system provided by the embodiments of the present application can include the following steps.

[0025] Step 101: An elevator operating circuit, a normally closed relay switch is connected in series in the elevator operating circuit.

[0026] In the embodiments of the present application, a key normally closed relay switch is arranged in the elevator operating circuit. By connecting it in series in the main circuit, the switch remains closed in the normal state, thereby ensuring that the elevator can operate normally. When the control device detects elevator abnormalities or triggers the protection mechanism, the relay switch will be disconnected. By immediately cutting off the power supply of the elevator operating circuit, the operation of the elevator is stopped, and the normal elevator operating circuit is protected from being affected, thereby avoiding potential safety accidents. The elevator operating circuit can include the lighting circuit, communication circuit and power supply circuit of the elevator door of the elevator, etc.

[0027] Step 102: limit circuit, including a travel switch and a speed governor coil connected in series with each other, the travel switch being a normally closed switch.

[0028] In the embodiment of the present application, the speed governor coil serves as the core element of the elevator speed limit protection, and cooperates with the travel switch. When the speed limit or the limit condition is triggered during the operation of the elevator, the travel switch is switched to the open state, thereby interrupting the current of the limit circuit, triggering the protection mechanism, and the control device signal controls the relay switch to be powered off, thereby preventing the elevator from continuing to operate.

[0029] Step 103: detection device, including a detection relay coil connected in series in the limit circuit, the potential of the detection relay coil, the speed governor coil and the travel switch gradually decreases in the limit circuit; the detection device further includes a control module for obtaining the potential difference between the two ends of the detection relay coil under the power-on condition of the elevator, and the control module is signal-connected with the relay switch to control the on-off of the relay switch according to the potential difference.

[0030] In the embodiment of the present application, the detection relay coil is connected in series in the limit circuit, and the speed governor coil and the travel switch together form a step-down potential distribution network. Through this layout, the detection relay coil can accurately perceive the potential change at different positions in the limit circuit. The control module can obtain the potential difference between the two ends of the detection relay coil under the power-on condition of the elevator. The control module can be connected with the relay switch and the detection relay coil through signal connection or electrical connection. Through the analysis of the potential difference, the control module can judge the running state of the limit circuit. When the potential difference is less than the preset safety threshold, the control module sends a signal to the relay switch to control it to be powered off, so as to realize the protection and regulation of the running state of the elevator.

[0031] Through the above technical solution, the detection relay coil, the speed governor coil and the travel switch are connected in series, and the elevator running circuit is connected in series with the relay switch. When the speed governor coil senses that the speed of the elevator is too fast, the speed governor coil and / or the travel switch are open, resulting in the open of the limit circuit, and the control device senses the open of the limit circuit and sends a signal to control the relay switch to be powered off; or when the control device detects that the potential difference between the two ends of the relay coil is lower than the preset safety threshold, the relay switch is powered off to protect the main running circuit of the elevator, thereby improving the safety of the elevator.

[0032] In the embodiment of the present application, the detection device further includes a power module, the power module is electrically connected with the detection relay coil, and the output current type of the power module is direct current or alternating current.

[0033] In the embodiments of the present application, in order to enhance the applicability of the above-mentioned system and the stability of power supply for the detection device, the detection device can also be equipped with a power module. The power module is directly connected with the detection relay coil for providing working power. In order to adapt to different power requirements and application environments, the output type of the power module can be direct current or alternating current, so as to ensure that the detection relay coil can work normally under various power supply conditions. In this way, the above-mentioned elevator protection system can be applied to more types of elevators, and has wide practical value.

[0034] In the embodiments of the present application, the current type flowing through the governor coil is direct current or alternating current, and the output current type of the power module is consistent with the current type flowing through the governor coil.

[0035] In the embodiments of the present application, the detection relay coil is divided into two types of direct current detection relay coil and alternating current detection relay coil according to different working currents. In order to ensure the normal operation of the detection device, the type of the detection relay coil strictly corresponds to the output type of the power module, that is, the direct current power module is matched with the direct current detection relay coil, and the alternating current power module is matched with the alternating current detection relay coil. Therefore, the matching of the power module and the detection relay coil is ensured, and damage or abnormal function of the equipment caused by inconsistent power types is avoided.

[0036] In the embodiments of the present application, when the output current type of the power module is direct current, the equivalent resistance of the governor coil is 12 ohms, and the equivalent resistance of the detection relay coil is 640 ohms.

[0037] In one embodiment, the specification of the governor coil is DC24V\2A, the specification of the detection relay coil is DC24V\37mA, the equivalent resistance of the governor coil is 12 ohms, the equivalent resistance of the detection relay coil is 640 ohms, 24V direct current power is applied after being connected in series with the travel switch, the voltage drop on the detection relay coil is 23.6V, and the current is 36.8MA. The preset safety threshold is 19.2V, therefore, the elevator circuit does not occur open circuit failure. In the case that the governor coil, the travel switch and the entire elevator circuit do not appear open circuit, and the contact resistance of the travel switch contact does not become large, the detection relay can be ensured to be powered, so as to realize the open circuit detection and protection of the elevator circuit.

[0038] In the embodiments of the present application, when the output current type of the power module is alternating current, the equivalent resistance of the governor coil is 314.3 ohms, and the equivalent resistance of the detection relay coil is 14500 ohms.

[0039] In one embodiment, the overspeed governor coil specification is AC220V\0.7A, the detection relay coil specification is AC220V\16MA, the equivalent resistance of the overspeed governor coil is 314.3 ohms; the equivalent resistance of the detection relay coil is 14.5K ohms; the voltage drop on the detection relay coil is 215.33V when AC220V power is applied in series with the travel switch; and the current is 14.9MA. The preset safety threshold is 176V, so the elevator circuit does not have an open circuit failure. In the case that the overspeed governor coil, the travel switch and the entire elevator circuit do not have an open circuit, and the contact resistance of the travel switch contact does not increase, the detection relay can be ensured to be powered, thereby realizing the open circuit detection and protection of the elevator circuit.

[0040] In the embodiment of the present application, the control module is further configured to control the relay switch to be powered off when the potential difference is less than the preset safety threshold.

[0041] In the embodiment of the present application, the system further comprises an alarm device electrically connected to the relay switch, configured to send an alarm information when the relay switch is powered off.

[0042] In the embodiment of the present application, the alarm device can be electrically connected to the relay switch, which can monitor the working state of the relay switch in real time. When the relay switch is powered off due to failure or protection mechanism, the alarm device will start immediately and send an alarm information to remind the relevant personnel to take timely measures. Thus, the running safety and failure response efficiency of the elevator are further improved.

[0043] In the embodiment of the present application, the travel switch comprises a first travel switch and a second travel switch connected in parallel with the first travel switch, configured to form a redundant travel switch of the first travel switch.

[0044] In the embodiment of the present application, the travel switch 1 and the travel switch 2 can be redundant travel switches of each other, and only when the travel switch 1 and the travel switch 2 send an open circuit failure at the same time, the entire travel switch will be open.

[0045] The embodiment of the present application also provides an elevator comprising the elevator protection system described above.

[0046] It should be further noted that the terms "comprising", "containing" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a list of elements not only includes those elements, but also includes other elements not explicitly listed, or other elements inherent to such process, method, article or apparatus. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article or apparatus that includes the element.

[0047] The above merely provides an example of the present application, and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall fall into the scope of claims of the present application.

Claims

1. An elevator protection system, characterized in that: include: An elevator operation circuit, wherein a normally closed relay switch is connected in series with the elevator operation circuit; The limit circuit includes a travel switch and a speed limiter coil connected in series, wherein the travel switch is a normally closed switch; The detection device comprises a detection relay coil connected in series in the limit circuit, wherein the potential of the detection relay coil, the speed limiter coil and the travel switch in the limit circuit gradually decreases; The detection device also includes a control module for obtaining the potential difference across the detection relay coil when the elevator is powered on. The control module is connected to the relay switch signal to control the relay switch on and off according to the potential difference.

2. The system according to claim 1, wherein: The detection device further includes a power supply module, which is electrically connected to the detection relay coil. The output current type of the power supply module is direct current or alternating current.

3. The system according to claim 2, characterized in that The type of current flowing through the speed limiter coil is direct current or alternating current, and the output current type of the power module is consistent with the type of current flowing through the speed limiter coil.

4. The system according to claim 3, characterized in that When the output current type of the power module is direct current, the equivalent resistance of the speed limiter coil is 12 ohms, and the equivalent resistance of the detection relay coil is 640 ohms.

5. The system according to claim 3, wherein: When the output current type of the power module is alternating current, the equivalent resistance of the speed limiter coil is 314.3 ohms, and the equivalent resistance of the detection relay coil is 14500 ohms.

6. The system according to any one of claims 1 to 5, characterized in that The control module is further configured to control the relay switch to cut off power when the potential difference is less than a preset safety threshold.

7. The system according to any one of claims 1 to 5, characterized in that The system further comprises: An alarm device is electrically connected to the relay switch and is used to issue an alarm message when the relay switch is powered off.

8. The system according to any one of claims 1 to 5, characterized in that The travel switch comprises: First travel switch; The second travel switch is connected in parallel with the first travel switch and is used to form a redundant travel switch for the first travel switch.

9. An elevator, characterized in that: The invention comprises an elevator protection system according to any one of claims 1 to 8.

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