Water logging detection circuit, PCB and detection system for escalator machine room

Abstract

The utility model discloses a flooding detection circuit, PCB board and detection system for escalator machine room, said circuit includes conducting part, control part and partial pressure part, conducting part's transmitting end is used for connecting external power supply unit, conducting part's base end is connected with the partial pressure part, and the partial pressure part is connected with the control part. The current collection end of the conduction part is connected with the coil end of the control part; one end of the voltage dividing part is connected with the transmitting end of the conduction part and the normally open end of the control part, the other end of the voltage dividing part is used for being connected with a metal probe, and the metal probe is used for detecting whether water accumulation exists or not; the normally-open end of the control part is further used for being connected with a control system of the escalator. According to the circuit disclosed by the invention, when the water accumulation problem exists, the accumulated water and the metal probe form a conductive loop to trigger the conduction part to start working so as to trigger the control part to feed back the detection signal to the control system of the escalator, water flooding detection is realized, and the circuit has the advantages of stable and continuous detection task and high detection precision.

Description

Technical Field

[0001] The utility model relates to the technical field of water level detection, and in particular to a water flooding detection circuit, a PCB board and a detection system for an escalator machine room. Background Art

[0002] There are some mechanical devices and electrical components installed in the escalator machine room. If water ingress and water accumulation occur during the operation of the machine room, the accumulated dirty water may cause problems such as rust on the mechanical devices, and the electrical components in the machine room may short-circuit or burn out. Therefore, a device is needed in the escalator machine room to detect whether the machine room is water-logged or flooded.

[0003] In existing escalator machine rooms, a float level switch or a capacitive level switch is generally used to implement water flooding detection.

[0004] The float level switch is installed in the escalator machine room. When the water level in the machine room rises due to flooding, the float switch floats up due to buoyancy. The change in liquid level causes the mechanical switch in the float to generate a switch signal, thereby sending a flooding signal to the escalator control system. However, since the float level switch is a simple passive device, the float needs to be installed in a position where it can float flexibly. Once the float is stuck, the float level switch will lose its detection effect.

[0005] The measurement principle of the capacitive liquid level switch is: the change in the level of the material being detected causes the size of the probe covered area to change, thereby causing the capacitance value to change; when the probe is in the air, the measurement result is a very small capacitance value. When the water level in the escalator room rises due to flooding, the capacitance value will increase accordingly with the increase in the area of ​​the probe covered by the material, and the switch state changes; however, in the actual detection process, any other objects, such as branches, paper pieces, including insects and other non-liquids, passing near the surface of the capacitive liquid level switch probe will also cause the switch state to change due to the covered area. When the room is relatively humid and water droplets condense on the surface of the capacitive liquid level switch probe, the switch state will also change due to the covered area, which is prone to misjudgment problems and affects the working stability of the escalator room.

[0006] It can be seen that the existing technology still needs to be improved and enhanced. Utility Model Content

[0007] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide an escalator machine room flooding detection circuit, which has the advantages of stable and continuous detection tasks and high detection accuracy.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A water flooding detection circuit for an escalator machine room comprises a conducting part, a control part and a voltage divider part, wherein the transmitting end of the conducting part is used to connect to an external power supply unit, the base end of the conducting part is connected to the voltage divider part, and the collector end of the conducting part is connected to the coil end of the control part; one end of the voltage divider part is respectively connected to the transmitting end of the conducting part and the normally open end of the control part, and the other end of the voltage divider part is used to connect to a metal probe, and the metal probe is used to detect whether there is a water accumulation problem; the normally open end of the control part is also used to connect to the control system of the escalator.

[0010] In the escalator room flooding detection circuit, the conducting part includes a transistor T1, the emitter of the transistor T1 is connected to one end of the voltage divider and is used to connect an external power supply unit, which is used to provide a 24V DC voltage; the collector of the transistor T1 is connected to the coil end of the control part, and the base of the transistor T1 is connected to the voltage divider.

[0011] In the escalator room flooding detection circuit, the control unit includes a signal relay K1, one end of the coil of the signal relay K1 is connected to the collector of the transistor T1, and the other end of the coil of the signal relay K1 is grounded; one end of the normally open contact group of the signal relay K1 is connected to one end of the voltage divider, and the other end of the normally open contact group of the signal relay K1 is used to connect to the control system of the escalator.

[0012] In the escalator room flooding detection circuit, the voltage divider includes a first resistor R1 and a second resistor R2, one end of the second resistor R2 is respectively connected to the emitter of the transistor T1 and one end of the normally open contact group of the signal relay K1, the other end of the second resistor R2 is respectively connected to the base of the transistor T1 and one end of the first resistor R1, and the other end of the first resistor R1 is used to connect a metal probe.

[0013] In the escalator room flooding detection circuit, the control unit further includes a diode D1, the anode of the diode D1 is connected to the other end of the coil of the signal relay K1, and the cathode of the diode D1 is connected to one end of the coil of the signal relay K1.

[0014] The present application also discloses a PCB board, on which is printed any of the above-mentioned automatic escalator machine room flooding detection circuits.

[0015] The present application also discloses a water flooding detection system for an escalator room, comprising a signal processing device, a detection device and an escalator control system, wherein the signal processing device adopts any of the water flooding detection circuits described above to realize working control, the detection device comprises a metal probe, the detection device is connected to the input end of the signal processing device, and the output end of the signal processing device is connected to the control system.

[0016] In the escalator room flooding detection system, the detection device also includes a fixed bracket and an insulating shell, the fixed bracket and the metal probe are arranged in the insulating shell, the fixed bracket is fixedly connected to the metal probe, the fixed bracket is used to fix the metal probe to the bottom of the escalator room, and a through hole is opened at the bottom of the insulating shell.

[0017] In the escalator machine room flooding detection system, an insulating sleeve is provided at the connection between the metal probe and the fixing bracket.

[0018] Beneficial effects:

[0019] The utility model provides a water flooding detection circuit for an escalator machine room. Since the bottom of the escalator machine room is made of metal material and has conductivity, when there is water accumulation, the accumulated water and the metal probe form a conductive loop to trigger the conduction part to start working, so as to trigger the control part to feed back the detection signal to the control system of the escalator, thereby realizing water flooding detection. The utility model has the advantages of stable and continuous detection tasks and high detection accuracy, and greatly reduces the possibility of misjudgment problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A circuit structure diagram of a flood detection circuit provided by the utility model;

[0021] Figure 2 This is a schematic structural diagram of the detection device provided by the utility model.

[0022] Explanation of main component symbols: 11-metal probe, 12-fixing bracket, 13-insulating shell, 2-control system. DETAILED DESCRIPTION

[0023] The utility model provides an escalator machine room water flooding detection circuit, PCB board and detection system. In order to make the purpose, technical scheme and effect of the utility model clearer and more specific, the utility model is further described in detail with reference to the accompanying drawings and examples.

[0024] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the term "bottom" etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and cannot be understood as a limitation on the present invention; in addition, the terms "installation", "connection" etc. should be understood in a broad sense, and for ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0025] See also Figure 1 The utility model provides a water flooding detection circuit for an escalator machine room, including a conducting part, a control part and a voltage divider part. The transmitting end of the conducting part is used to connect to an external power supply unit, the base end of the conducting part is connected to the voltage divider part, and the collector end of the conducting part is connected to the coil end of the control part; one end of the voltage divider part is respectively connected to the transmitting end of the conducting part and the normally open end of the control part, and the other end of the voltage divider part is used to connect to a metal probe 11, and the metal probe 11 is used to detect whether there is a water accumulation problem; the normally open end of the control part is also used to connect to the control system 2 of the escalator.

[0026] The present application discloses a water flooding detection circuit for an escalator machine room. Since the bottom of the escalator machine room is made of metal and is conductive, when there is water accumulation, the accumulated water and the metal probe 11 form a conductive loop to trigger the conduction part to start working, so as to trigger the control part to feedback the detection signal to the control system 2 of the escalator, thereby realizing water flooding detection. It has the advantages of stable and continuous detection tasks and high detection accuracy, greatly reduces the possibility of misjudgment problems, and improves the stability and reliability of the escalator during operation.

[0027] For further information, see Figure 1 The conducting part includes a transistor T1, the emitter of the transistor T1 is connected to one end of the voltage divider and is used to connect an external power supply unit, and the external power supply unit is used to provide a 24V DC voltage; the collector of the transistor T1 is connected to the coil end of the control part, and the base of the transistor T1 is connected to the voltage divider; in this embodiment, the transistor T1 is a PNP transistor, model S8550.

[0028] In this embodiment, the external power supply unit is a conventional power supply in the escalator control cabinet, which can output a 24V DC voltage.

[0029] For further information, see Figure 1The control unit includes a signal relay K1, one end of the coil of the signal relay K1 is connected to the collector of the transistor T1, and the other end of the coil of the signal relay K1 is grounded; one end of the normally open contact group of the signal relay K1 is connected to one end of the voltage divider, and the other end of the normally open contact group of the signal relay K1 is used to connect to the control system 2 of the escalator.

[0030] For further information, see Figure 1 The voltage divider includes a first resistor R1 and a second resistor R2, one end of the second resistor R2 is respectively connected to the emitter of the transistor T1 and one end of the normally open contact group of the signal relay K1, the other end of the second resistor R2 is respectively connected to the base of the transistor T1 and one end of the first resistor R1, and the other end of the first resistor R1 is used to connect the metal probe 11.

[0031] In this embodiment, the voltage divider plays a role of voltage division, so that the transistor T1 can work stably under the rated voltage, ensuring that the transistor T1 is normally and stably turned on, thereby improving the stability and reliability of the flood detection circuit during operation.

[0032] For further information, see Figure 1 The control unit further includes a diode D1, an anode of the diode D1 is connected to the other end of the coil of the signal relay K1, and a cathode of the diode D1 is connected to one end of the coil of the signal relay K1.

[0033] In this embodiment, the diode D1 plays a protective role. Since the load driven by the signal relay K1 may be an inductive load, when the signal relay K1 itself is extinguished, the energy stored in the inductor will be released to form a reverse voltage; and the reverse voltage may cause damage to the contacts or cause malfunction; therefore, the diode D1 is set to absorb the reverse voltage and pass it through the short-circuit current to protect the contacts of the signal relay K1.

[0034] The flood detection circuit disclosed in the present application, in actual operation, according to the conductivity of water and the metal grounding of the bottom of the machine room, the resistance of water is about 3KΩ to 20KΩ. When water accumulates in the escalator machine room and slowly rises to the surface of the metal probe 11, a 0V low-level signal is conducted to the technical probe through the bottom of the machine room via the accumulated water, and then connected to the X1 terminal of the flood detection circuit through the connection between the metal probe 11 and the signal processing device, thereby triggering the conduction transistor T1 to drive the signal relay K1 to be attracted. At this time, the X2 terminal of the flood detection circuit will output a +24V high-level signal. The +24V high level signal output from the X2 terminal of the flood detection circuit is disconnected by the normally open contact of the signal relay K1, and the +24V high level signal output to the control system 2 of the escalator disappears, and the control system 2 can be restored to normal through a reset command.

[0035] The present application also discloses a PCB board, on which is printed any of the above-mentioned automatic escalator machine room flooding detection circuits.

[0036] See also Figure 1 and Figure 2 The present application also discloses a water flooding detection system for an escalator room, comprising a signal processing device, a detection device and an escalator control system 2, wherein the signal processing device adopts any of the water flooding detection circuits described above to realize working control, the detection device comprises a metal probe 11, the detection device is connected to the input end of the signal processing device, and the output end of the signal processing device is connected to the control system 2.

[0037] In this embodiment, the signal processing device is disposed in a junction box of an escalator machine room, and the signal processing device is electrically connected to the detection device and the control system 2 respectively through data cables.

[0038] For further information, see Figure 2 The detection device also includes a fixed bracket 12 and an insulating shell 13. The fixed bracket 12 and the metal probe 11 are arranged in the insulating shell 13. The fixed bracket 12 is fixedly connected to the metal probe 11. The fixed bracket 12 is used to fix the metal probe 11 at the bottom of the escalator room. A through hole is opened at the bottom of the insulating shell 13, and the through hole is used to realize water flooding detection of the metal probe 11.

[0039] In this embodiment, the fixing bracket 12 can be bolted to the inner wall of the escalator room. Fixing the metal probe 11 by the fixing bracket 12 can prevent the metal probe 11 from being displaced during the detection process, thereby ensuring the accuracy and effectiveness of the detection result.

[0040] In this embodiment, the insulating shell 13 can be a plastic shell, and the insulating shell 13 is glued or detachably connected to the inner wall of the escalator machine room; by providing the insulating shell 13, even if a metal conductive object accidentally appears in the machine room, it can avoid the formation of a loop between the metal conductive object and the metal probe to cause the water flooding detection circuit to be falsely triggered, thereby greatly reducing the misjudgment rate of water flooding detection in the machine room.

[0041] In this embodiment, the distance between the metal probe 11 and the bottom horizontal ground of the machine room of the escalator is 1 inch.

[0042] Furthermore, an insulating sleeve is provided at the connection between the metal probe 11 and the fixing bracket 12; in the present embodiment, the insulating sleeve is a rubber sleeve, and the fixing bracket 12 is a metal bracket; the insulating sleeve is respectively glued to the metal probe 11 and the fixing bracket 12.

[0043] In this embodiment, an insulating sleeve is provided to achieve insulation between the metal probe 11 and the fixing bracket 12, thereby avoiding false triggering caused by a loop formed between the metal probe 11 and the fixing bracket 12, thereby improving the stability and safety of the flood detection circuit during operation.

[0044] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and the utility model concept of the utility model, and all these changes or substitutions should fall within the protection scope of the utility model.

Claims

1. An escalator room flooding detection circuit, characterized in that: It includes a conducting part, a control part and a voltage divider part. The transmitting end of the conducting part is used to connect to an external power supply unit, the base end of the conducting part is connected to the voltage divider part, and the collector end of the conducting part is connected to the coil end of the control part; one end of the voltage divider part is respectively connected to the transmitting end of the conducting part and the normally open end of the control part, and the other end of the voltage divider part is used to connect to a metal probe, which is used to detect whether there is a water accumulation problem; the normally open end of the control part is also used to connect to the control system of the escalator.

2. The escalator machine room flooding detection circuit according to claim 1, characterized in that: The conducting part includes a transistor T1, the emitter of which is connected to one end of the voltage divider and is used to connect to an external power supply unit, which is used to provide a 24V DC voltage; the collector of the transistor T1 is connected to the coil end of the control part, and the base of the transistor T1 is connected to the voltage divider.

3. The escalator room flooding detection circuit according to claim 2, characterized in that: The control unit includes a signal relay K1, one end of the coil of the signal relay K1 is connected to the collector of the transistor T1, and the other end of the coil of the signal relay K1 is grounded; one end of the normally open contact group of the signal relay K1 is connected to one end of the voltage divider, and the other end of the normally open contact group of the signal relay K1 is used to connect to the control system of the escalator.

4. The escalator machine room flooding detection circuit according to claim 3, characterized in that: The voltage divider includes a first resistor R1 and a second resistor R2, one end of the second resistor R2 is respectively connected to the emitter of the transistor T1 and one end of the normally open contact group of the signal relay K1, the other end of the second resistor R2 is respectively connected to the base of the transistor T1 and one end of the first resistor R1, and the other end of the first resistor R1 is used to connect a metal probe.

5. The escalator machine room flooding detection circuit according to claim 3, characterized in that: The control unit further includes a diode D1 , wherein an anode of the diode D1 is connected to the other end of the coil of the signal relay K1 , and a cathode of the diode D1 is connected to one end of the coil of the signal relay K1 .

6. A PCB board, characterized in that: The PCB board is printed with the escalator machine room flooding detection circuit as described in any one of claims 1 to 5.

7. An escalator room flooding detection system, characterized in that: The invention comprises a signal processing device, a detection device and a control system of an escalator, wherein the signal processing device adopts the flood detection circuit as described in any one of claims 1 to 5 to realize working control, the detection device comprises a metal probe, the detection device is connected to the input end of the signal processing device, and the output end of the signal processing device is connected to the control system.

8. The escalator room flooding detection system according to claim 7, characterized in that: The detection device also includes a fixed bracket and an insulating shell. The fixed bracket and the metal probe are arranged in the insulating shell. The fixed bracket is fixedly connected to the metal probe. The fixed bracket is used to fix the metal probe at the bottom of the escalator room. A through hole is opened at the bottom of the insulating shell.

9. The escalator room flooding detection system according to claim 8, characterized in that: An insulating sleeve is provided at the connection between the metal probe and the fixing bracket.

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