Dual detection circuit for protective cover of speed governor of elevator

Abstract

The utility model provides a dual detection circuit for a protective cover of an elevator speed governor. The dual detection circuit comprises a magnetic reed module, a photosensitive detection module and an alarm module, the magnetic reed module and the photosensitive detection module are connected with the alarm module; the magnetic reed module comprises a first control circuit, a magnetic edge arranged at the upper end of the protective cover and a magnetic reed switch arranged on a switch support in the speed limiter. The magnetic edge is separated from the magnetic reed switch, and the first control circuit sends a first alarm signal to the alarm module to enable the alarm module to give an alarm; the photosensitive detection module comprises a light sensor and a second control circuit; the light sensor is arranged on the speed limiter; the protective cover is separated from the speed limiter, so that the light sensor sends a second alarm signal to the alarm module after sensing the light, and the alarm module gives an alarm; by means of the technical scheme, a maintainer can be informed of installing the speed limiter protection shell in place in time through an alarm signal of the detection module, and safe and stable work of the speed limiter is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of elevator speed limiters, in particular to a dual-detection circuit for the protective cover of an elevator speed limiter. Background Art

[0002] The speed limiter is one of the important safety components of an elevator. Its working principle is to send out signals in a timely manner when the elevator runs overspeed, runs out of control, etc., cut off the power supply of the elevator drive main engine and make the brake act, so that the car stops on the guide rail and remains stationary, thus avoiding casualties and equipment damage. Due to the need for daily maintenance and annual inspection of the elevator, the protective cover of the speed limiter is removed. After maintenance or testing, it is often forgotten to install the protective cover of the speed limiter, making the speed limiter in a bare state. If mice or small animals break into the elevator machine room and are stuck by the ratchet of the speed limiter mechanical mechanism, the sensitivity of the pawl decreases, and it will not be able to accurately catch the ratchet teeth, resulting in the failure of the overspeed protection of the speed limiter and causing elevator accidents. Content of the Utility Model

[0003] In view of this, the purpose of the utility model is to provide a dual-detection circuit for the protective cover of an elevator speed limiter, and notify the maintenance personnel to install the protective housing of the speed limiter in place in time through the alarm signal of the detection module, so as to ensure the safe and stable operation of the speed limiter.

[0004] To achieve the above purpose, the utility model adopts the following technical scheme: a dual-detection circuit for the protective cover of an elevator speed limiter, including a magnetic reed module, a photosensitive detection module and an alarm module; the magnetic reed module and the photosensitive detection module are connected to the alarm module; the magnetic reed module includes a first control circuit, a magnetic edge arranged at the upper end of the protective cover and a magnetic reed switch arranged on the switch bracket inside the speed limiter; the magnetic edge is separated from the magnetic reed switch, and the first control circuit sends a first alarm signal to the alarm module to make the alarm module issue an alarm; the photosensitive detection module includes a light sensor and a second control circuit; the light sensor is arranged on the speed limiter; when the protective slag detaches from the speed limiter and the light sensor senses light, it sends a second alarm signal to the alarm module, and the alarm module issues an alarm.

[0005] In a preferred embodiment, the first control circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and a first voltage comparator; the magnetic reed switch and the third resistor form a series circuit and are connected in parallel with the second resistor to form a parallel circuit; one end of the parallel circuit is grounded, and the other end of the parallel circuit is connected to the first input end of the first voltage comparator and one end of the first resistor. The second input end of the first voltage comparator is connected to one end of the fifth resistor, and the other end of the fifth resistor is grounded; the signal output end of the first voltage comparator is connected to the alarm circuit.

[0006] In a preferred embodiment, the second control circuit includes a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a third capacitor, a potentiometer, a second voltage comparator, and a triode.

[0007] In a preferred embodiment, the optical sensor is specifically a photoresistor.

[0008] In a preferred embodiment, a first input terminal of the second voltage comparator is connected to one end of the optical sensor and one end of the tenth resistor, and the other end of the optical sensor is grounded; both ends of the third capacitor are respectively connected to both ends of the optical sensor; a voltage adjustment terminal of the potentiometer is connected to a second input terminal of the second voltage comparator; a signal output terminal of the second voltage comparator is connected to one end of the twelfth resistor, and the other end of the twelfth resistor is connected to the base of the triode; an emitter of the triode is connected to a power supply, a collector of the triode is connected to one end of the thirteenth resistor, and the other end of the thirteenth resistor is connected to an alarm module.

[0009] In a preferred embodiment, the alarm module includes an LED lamp flashing circuit and a buzzer alarm circuit.

[0010] In a preferred embodiment, the LED lamp flashing circuit includes a control chip and a light-emitting diode; the reed switch is connected to an input terminal of the control chip, and an output terminal of the control chip is connected to the light-emitting diode; the reed switch sends a control signal to the control chip, and the control chip controls the light-emitting diode to turn on or off.

[0011] In a preferred embodiment, the buzzer alarm circuit includes a buzzer; the second control circuit includes a triode; a collector of the triode is connected to the buzzer.

[0012] Compared with the prior art, the present utility model has the following beneficial effects: It has a control device for automatically detecting whether the protective cover is missing. Maintenance workers can install the protective cover of the speed limiter in place in time according to the alarm information of the missing protective cover, so as to avoid elevator accidents caused by the missing protective cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of the spring switch structure of the preferred embodiment of the present utility model;

[0014] Figure 2 Schematic diagram of the internal structure of LM393 of the preferred embodiment of the present utility model;

[0015] Figure 3 External view of the NE555 integrated circuit of the preferred embodiment of the present utility model;

[0016] Figure 4 Schematic diagram of the double detection circuit of the speed limiter protective cover for the preferred embodiment of the present utility model;

[0017] Figure 5 Schematic diagram of the control box of the detection device for the preferred embodiment of the present utility model;

[0018] Figure 6 Panel diagram of the control box of the detection device for the preferred embodiment of the present utility model;

[0019] Figure 7 Layout diagram of the electronic components of the detection device for the preferred embodiment of the present utility model;

[0020] Figure 8 Schematic diagram of the installation position of the detection device on the speed limiter for the preferred embodiment of the present utility model. Detailed implementation manners

[0021] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further descriptions of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0023] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary embodiments according to the present application; as used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "include" and / or "comprise" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0024] The double detection circuit of the elevator speed limiter protective cover, referring to Figure 1-8 , includes a magnetic reed module, a photosensitive detection module 7, and an alarm module; the magnetic reed module and the photosensitive detection module 7 are connected to the alarm module; the photosensitive detection module 7 is connected to a speed limiter switch 6; the magnetic reed module includes a first control circuit, a magnetic edge 9 provided at the upper end of the protective cover 10, and a magnetic reed switch K1 provided on the switch bracket inside the speed limiter; the magnetic reed switch K1 is disposed on a magnetic reed switch bracket 8, the magnetic edge 9 is separated from the magnetic reed switch K1, and the first control circuit sends a first alarm signal to the alarm module to cause the alarm module to give an alarm; the photosensitive detection module 7 includes a light sensor and a second control circuit; the light sensor is provided on the speed limiter; when the protective slag is separated from the speed limiter and the light sensor senses light, a second alarm signal is sent to the alarm module, and the alarm module gives an alarm.

[0025] The alarm module includes an LED flashing circuit and a buzzer alarm circuit.

[0026] The light sensor is specifically a photoresistor RL. Specifically, the photoresistor RL uses a GL10528 photoresistor; it is a special resistor device made of semiconductor materials such as cadmium sulfide or cadmium selenide. To enhance sensitivity, the two poles are often made into a comb shape, and its surface is coated with a moisture-proof resin, having a photoelectric effect, and its resistance value will change with the change of light intensity.

[0027] The GL10528 photoresistor used in this device has the following parameters:

[0028] Model GL10528 Maximum Voltage 200 Power Consumption 150 Ambient Temperature -30℃ ∽+70℃ Spectral Peak 560 Bright Resistance (KΩ) 10∽20 Dark Resistance (MΩ) 2 Response Time (ms) 30

[0029] Reference Figure 2 , technical parameters of the reed switch K1:

[0030] Model PS-3150 Limit Switching Voltage 200V DC / AC Limit Power 10W Contact Resistance 100mΩ Limit Switching Current 0.5A DC / AC Limit Load Current 1A DC / AC Contact Capacitance 0.2PF Inductive Distance 1-40mm Contact Type Normally Open Type

[0031] The first voltage comparator A1 and the second voltage comparator A2 in this embodiment both use LM393. LM393 is composed of two independent and precise voltage comparators, and its offset voltage does not exceed 2.0 mV. It can work under a single power supply (2 VDC ∽ 36 VDC) or a dual power supply (±1 VDC ∽ ±18 VDC). And the magnitude of its current is not affected by the magnitude of the power supply voltage. The comparator has a unique performance, that is, even when working under a single power supply, its input common-mode voltage range can reach zero level.

[0032] The first control circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a first voltage comparator A1; the reed switch K1 and the third resistor R3 form a series circuit and are connected in parallel with the second resistor R2 to form a parallel circuit; one end of the parallel circuit is grounded, and the other end of the parallel circuit is connected to the first input end of the first voltage comparator A1 and one end of the first resistor R1. The second input end of the first voltage comparator A1 is connected to one end of the fifth resistor R5, and the other end of the fifth resistor R5 is grounded; the signal output end of the first voltage comparator A1 is connected to the alarm circuit.

[0033] Specifically, the reed switch K1 is installed on the internal switch bracket of the speed limiter, and the magnetic edge 9 is installed on the top of the protective cover 10. The detection distance can be adjusted according to the actual situation, and the range is within 1 - 40 mm. See the installation position in Figure 8. The reed switch K1 and the third resistor R3 form a series circuit and are connected in parallel with the second resistor R2. According to the on / off state of the switch, the voltage state of the first input terminal, i.e., pin ③, of the first voltage comparator A1 can be changed, and it is compared with the reference voltage of the second input terminal, i.e., pin ②, so as to switch the high and low of the output terminal voltage.

[0034] The second control circuit includes a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a third capacitor C3, a potentiometer VR, a second voltage comparator A2, and a triode 9012.

[0035] One end of the first input terminal of the second voltage comparator A1 is connected to one end of the photoresistor RL and one end of the tenth resistor R10, and the other end of the photoresistor RL is grounded; both ends of the third capacitor C3 are respectively connected to both ends of the photoresistor RL; the voltage adjustment terminal of the potentiometer VR is connected to the second input terminal of the second voltage comparator A2; the signal output terminal of the second voltage comparator A2 is connected to one end of the twelfth resistor R12, and the other end of the twelfth resistor R12 is connected to the base of the triode 9012; the emitter of the triode 9012 is connected to the power supply, the collector of the triode 9012 is connected to one end of the thirteenth resistor R13, and the other end of the thirteenth resistor R13 is connected to the alarm module.

[0036] Specifically, the housing detection device of the speed limiter uses a semiconductor photoresistor and a reed switch to form a dual-detection switch circuit. When the housing is separated from the speed limiter base, the photoresistor RL on the photodetector module 7 in the housing 10 is irradiated by light, and its resistance value rapidly decreases, changing from a high-resistance state (2 MΩ) in the dark state to a low-resistance state (below 20 KΩ). The change in the resistance value of the photoresistor RL is converted into a voltage signal and transmitted to the first input terminal, i.e., the non-inverting input terminal ⑤, of the second voltage comparator A2. This changing voltage signal is compared with the reference voltage of the second input terminal, i.e., the inverting input terminal ⑥, of the second voltage comparator A2. When in the dark state and the voltage of the non-inverting input terminal ⑤ is greater than the voltage of the inverting input terminal ⑥, the output terminal OUT of the second voltage comparator A2 outputs a high-level voltage; when in the bright state and the voltage of the non-inverting input terminal ⑤ is less than the voltage of the inverting input terminal ⑥, the output terminal OUT of the second voltage comparator A2 outputs a low-level voltage, and this level change is sent to the triode 9012 switch circuit for alarm signal output.

[0037] The potentiometer VR at the inverting input terminal ⑥ is used to adjust the potential voltage of this terminal, and this voltage is also the threshold inversion voltage input to the second voltage comparator A2, which is used for adjusting the light sensitivity. According to the alarm sound, it is prompted whether the speed limiter housing 10 is separated from the base.

[0038] The LED flashing circuit includes a control chip and a light-emitting diode 3; the reed switch is connected to the input end of the control chip, and the output end of the control chip is connected to the light-emitting diode 3; the reed switch K1 sends a control signal to the control chip, and the control chip controls the light-emitting diode 3 to turn on or off. Specifically, the control chip of the LED flashing circuit uses the NE555 chip, which has reliable performance. As long as several external resistors and capacitors are connected, a multivibrator can be formed to generate a square-wave signal. This square-wave signal can control the conduction and cut-off of the NPN-type triode, thereby controlling the lighting and extinguishing of the LED lamp to form a flashing state.

[0039] The buzzer alarm circuit includes a buzzer 4; the second control circuit includes a triode; the collector of the triode is connected to the buzzer 4.

[0040] Working principle of the overspeed governor protective cover detection device

[0041] 1. The overspeed governor housing detection device uses a photoresistor RL and a reed switch K1 to form a dual-detection circuit.

[0042] When the protective cover 10 and the overspeed governor base are in the normal position, due to the magnetic field, the magnetic edge 9 installed at the upper end of the protective cover 10 and the reed switch K1 inside the overspeed governor change from the original normally open state to a normally closed state. The second resistor R2 and the third resistor R3 are in parallel, and the voltage-dividing resistance value becomes smaller. The voltage at pin ③ of the first voltage comparator A1 is lower than the voltage at pin ②. The output of pin ④ of the first voltage comparator A1 is at a low level, and the LED lamp is in a dark state. This state indicates that the overspeed governor and the protective cover 10 have not deviated from the original position.

[0043] The photoresistor RL installed inside the overspeed governor is blocked by the protective cover 10, its illuminance becomes weaker, its resistance value becomes larger, the voltage at pin ⑤ of the second voltage comparator A2 is higher than the voltage at pin ⑥, and the output at pin ⑦ is at a high level. After being pulled up by the eleventh resistor R11, the potential level at the end of the twelfth resistor R12 is in a low-level state, and the triode 9012 is in a cut-off state, and the buzzer does not work.

[0044] 2. When the protective cover 10 and the overspeed governor base deviate from the normal position, the magnetic edge 9 installed at the upper end of the protective cover 10 and the reed switch K1 inside the overspeed governor have no magnetic field effect, and the reed switch K1 returns to its original normally open state. After being voltage-divided by the first resistor R1 and the second resistor R2, the voltage is applied to pin ③ of the first voltage comparator A1. The voltage at pin ③ of the first voltage comparator A1 is higher than the voltage at pin ②. The output of pin ④ of the first voltage comparator A1 is at a high level, triggering the integrated circuit 555 to work, and the LED lamp is in a flashing state. This state indicates that the overspeed governor and the protective cover 10 have deviated from the original position.

[0045] The photosensitive resistor RL installed inside the speed limiter has a stronger illumination intensity and a smaller resistance value due to the detachment of the protective cover 10. The voltage at the fifth pin of the second voltage comparator A2 is lower than the voltage at the sixth pin, and the output terminal at the seventh pin is at a low level. After being pulled up by the eleventh resistor R11, the potential level at the end of the twelfth resistor R12 is at a high level state, and the triode 9012 conducts and is in a saturation state, causing the buzzer to work. Through these two states, it can remind the maintenance personnel to install the protective cover 10 back to its original position in time when repairing the speed limiter, and can also play a role in detecting that the system is in a redundant state.

[0046] Part of the circuit of the double detection circuit for the protective cover of the elevator speed limiter is integrated in a protective cover detection device box 2, and the protective cover detection device box 2 is arranged above the speed limiter base 1. The whole device also includes a speed limiter bracket 5.

Claims

1. Double detection circuit for elevator overspeed governor protective cover, characterized in that It includes a reed module, a photosensitive detection module, and an alarm module; the reed module and the photosensitive detection module are connected to the alarm module; the reed module includes a first control circuit, a magnetic edge provided at the upper end of the protective cover, and a reed switch provided on the switch bracket inside the speed limiter; the magnetic edge is separated from the reed switch, and the first control circuit sends a first alarm signal to the alarm module to cause the alarm module to issue an alarm; the photosensitive detection module includes a light sensor and a second control circuit; the light sensor is provided on the speed limiter; when the protective cover is separated from the speed limiter and the light sensor senses light, it sends a second alarm signal to the alarm module, and the alarm module issues an alarm.

2. The double detection circuit of the elevator overspeed governor protective cover according to claim 1, characterized in that, The first control circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, and a first voltage comparator; the reed switch and the third resistor form a series circuit and are connected in parallel with the second resistor to form a parallel circuit; one end of the parallel circuit is grounded, and the other end of the parallel circuit is connected to the first input terminal of the first voltage comparator and one end of the first resistor. The second input terminal of the first voltage comparator is connected to one end of the fifth resistor, and the other end of the fifth resistor is grounded; the signal output terminal of the first voltage comparator is connected to the alarm module.

3. The double detection circuit of the elevator overspeed governor protective cover according to claim 1, characterized in that The second control circuit includes a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a third capacitor, a potentiometer, a second voltage comparator, and a triode.

4. The double detection circuit of the elevator overspeed governor protective cover according to claim 1, characterized in that The light sensor is specifically a photosensitive resistor.

5. The double detection circuit of the elevator overspeed governor protective cover according to claim 3, characterized in that, The first input terminal of the second voltage comparator is connected to one end of the light sensor and one end of the tenth resistor, and the other end of the light sensor is grounded; both ends of the third capacitor are respectively connected to both ends of the light sensor; the voltage adjustment terminal of the potentiometer is connected to the second input terminal of the second voltage comparator; the signal output terminal of the second voltage comparator is connected to one end of the twelfth resistor, and the other end of the twelfth resistor is connected to the base of the triode; the emitter of the triode is connected to the power supply, and the collector of the triode is connected to one end of the thirteenth resistor, and the other end of the thirteenth resistor is connected to the alarm module.

6. The double detection circuit of the elevator overspeed governor protective cover according to claim 1, characterized in that, The alarm module includes an LED flashing circuit and a buzzer alarm module.

7. The double detection circuit of the elevator overspeed governor protective cover according to claim 6, characterized in that, The LED flashing circuit includes a control chip and a light-emitting diode; the reed switch is connected to the input terminal of the control chip, and the output terminal of the control chip is connected to the light-emitting diode; the reed switch sends a control signal to the control chip, and the control chip controls the light-emitting diode to turn on or off.

8. The double detection circuit of the elevator overspeed governor protective cover according to claim 6, wherein, The buzzer alarm module includes a buzzer; the second control circuit includes a triode; the collector of the triode is connected to the buzzer.

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