CN203903705U - Signal sampling and transmitting circuit for weighing device in elevator compartment - Google Patents
Signal sampling and transmitting circuit for weighing device in elevator compartment Download PDFInfo
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- CN203903705U CN203903705U CN201420172236.9U CN201420172236U CN203903705U CN 203903705 U CN203903705 U CN 203903705U CN 201420172236 U CN201420172236 U CN 201420172236U CN 203903705 U CN203903705 U CN 203903705U
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- signal
- conversion
- lift car
- sampling
- elevator
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- Indicating And Signalling Devices For Elevators (AREA)
Abstract
The utility model relates to a weighing device in an elevator compartment and belongs to the field of elevator manufacturing. A signal sampling and transmitting circuit for the weighing device in the elevator compartment is characterized by comprising pressure sensors arranged in the elevator compartment, wherein the pressure sensor sample to output pressure signals and are connected with an A/D (analog/digital) conversion loop; a sampling pre-circuit of the A/D conversion loop is used for performing shaping and zero correction on the signal output by the pressure sensor through an operational amplifier, analog signals are converted into digital signals through A/D conversion, and the A/D conversion loop is connected with an RS485 serial communication sending interface and then is connected with an elevator system controller which is provided with an RS485 receiving module and is positioned outside the elevator compartment; the elevator system controller receives the digital signals through the RS485 serial communication sending interface; the digital signals are converted into analog signals by the A/D conversion loop and the analog signals are output.
Description
Technical field
The utility model relates to elevator signal collection and the communication technology, relates in particular to signal sampling and the transfer circuit of the weighting apparatus in a kind of lift car.
Background technology
In the use procedure of elevator, elevator weighing is only overweight for judging whether at present, employing be directly to obtain judging after weighing-up wave, just report to the police if exceed the voltage of regulation or the upper limit of electric current.But, along with popularizing of high rise elevator, and wish in elevator uses, to control more subtly, as the queuing situation on peak on and off duty needs multi-section elevator cooperation control, if now can obtain the variation of personnel in elevator, for elevator, demand forecast is very helpful.
And if obtain the variation of personnel in elevator, must receive the weighing-up wave in real-time elevator.Elevator weighing signal after collection, and if system controller communicate, signalling methods mainly contains two kinds of parallel communications and serial communications, but serial communication is not also applied to elevator weighing field completely, cannot meet the measurement signal variation of input; And, the analog signal collecting in elevator, through teletransmission, arrival machine room or control place have produced decay, and the easy distortion of weighing-up wave now recording is even lost.
Summary of the invention
Technical problem to be solved in the utility model is to provide signal sampling and the transfer circuit of weighting apparatus in a kind of lift car, solve the interior weighting apparatus of present lift car only overweight for judging, more function application cannot be provided, and the defect that in signal transmission, the real-time easy distortion of weighing-up wave is even lost after sampling.
Technical scheme
Signal sampling and the transfer circuit of weighting apparatus in a kind of lift car, it is characterized in that: comprise the pressure sensor being arranged in lift car, output voltage signal after described pressure sensor sampling, connect A/D conversion loop, the sampling front end circuit in described A/D conversion loop adopts op amp to carry out shaping school zero to the signal of described pressure sensor output, carry out A/D conversion analog signal is converted to digital signal, described A/D conversion loop connects RS485 serial communication transmission interface, be connected with the elevator device controller being provided with outside the lift car of RS485 receiver module again, described elevator device controller receives digital signal by RS485 serial communication receiving interface, by D/A conversion loop, digital signal is converted to simulation output.
Described pressure sensor is evenly arranged on car domain, is provided with four, amplifies shaping with two op amp Dui Ci, tetra-road signals, and the regulating voltage on every road uses adjustable resistance to complete the conditioning to pressure sensor signal.
AD conversion adopts M30620FCAFP chip, when conversion, by four tunnel analog inputs, is used as digital communication with aviation value.
Described op amp adopts LM324 amplifier chip.
Described RS485 serial ports sending and receiving interface all adopts MAX485EE chip.
The described actual output numerical value receiving by RS485 serial communication receiving interface, through D/A conversion loop outputting analog signal, carries out adjustment at zero point through LM324 op amp, finally strengthens the load-carrying capacity of signal by voltage follower loop.
Beneficial effect
Output voltage signal after the signal sampling of weighting apparatus and the sampling of transfer circuit adopts pressure sensor in lift car of the present utility model, by RS485 serial communication, signal be can't harm to transmission, can not only make signal be sent to other places such as machine room, realizing remote elevator measures and controls, and can expand the field of application of product, increase the load-carrying capacity of analog output voltage, and can be offset reference zero voltage, improve the cost performance of product, provide basis to the control function of further raising elevator.
Brief description of the drawings
Fig. 1 is overall architecture block diagram of the present utility model.
Fig. 2 is the input shaper school null circuit schematic diagram of AD conversion loop sampling front end circuit of the present utility model.
Fig. 3 is four road A/D change-over circuit schematic diagrams of the present utility model.
Fig. 4 is RS485 serial communication circuit schematic diagram of the present utility model.
Fig. 5 is D/A change-over circuit schematic diagram of the present utility model.
Fig. 6 is integrated circuit wiring schematic diagram of the present utility model.
Detailed description of the invention
Below in conjunction with specific embodiments and the drawings, further set forth the utility model.
The utility model proposes signal sampling and the transfer circuit of weighting apparatus in a kind of lift car, comprise the A/D conversion of pressure sensor and sensor input analog signal, RS485 serial ports transport module, D/A signal conversion module.Pressure sensor mouth access LM324 amplifier is carried out integer school zero, after carry out A/D modular converter, analog signal is converted to after digital signal, sent by RS485 serial ports, receive digital signal at machine room by RS485 serial ports, finally convert digital signal to simulation output by D/A modular converter.
Described A/D modular converter sampling front end circuit is inputted integer school zero by the processing of LM324 amplifier chip and is illustrated as accompanying drawing 2, A/D conversion adopts M30620FCAFP chip, when conversion, illustrate as accompanying drawing 3 by 4 tunnel analog inputs, observed reading is averaged as digital communication.
Described RS485 serial ports sending module comprises that MAX485EE chip illustrates as accompanying drawing 4, and in described MAX485EE chip, A port is connected with the VSS end of MAX485EE chip by first inductance and first resistance; In described MAX485EE chip, B port is connected with the VCC port of MAX485EE chip by second inductance and second resistor; First inductance in sending module is connected with second resistor connecting place with second inductance by a terminal resistance with first resistance connecting place; DE end and the RE end of described MAX485EE chip are connected and are connected with the P72/CLK2 in elevator car; The R end of described MAX485EE chip is connected with the RXD2 end in elevator car, and the T end of described MAX485EE chip is connected with the TXD2 end in elevator car.
While sending data, the RE end of MAX485EE is connected with DE end, dispose 1 at this point of connection, TXD2 end in elevator car is connected with the D end of MAX485EE, RXD2 is connected with the R end of MAX485EE, the A end of MAX485EE is connected to the ground through first inductance and a resistance, and B end and a resistance of MAX485EE are connected with VCC, is connected everywhere at first inductance and resistance connection with second inductance with resistance point of connection place with terminal resistance.In machine room, elevator device controller receives 485 digital signals, it receives signal circuit and transtation mission circuit design equity, the hardware circuit method of attachment of MAX485EE chip is herein the same with the circuit connecting method that sends MAX485EE, different is that now RS485 is receiving function, so level will set low after the DE of MAX485EE end is connected with RE end, the RXD2 of elevator device controller is connected with D end with the R end of MAX485EE respectively with TXD2, realizes the receiving function to RS485 signal.
Described RS485 serial ports receiver module comprises that MAX485EE chip illustrates as accompanying drawing 4 equally, and in described MAX485EE chip, A port is connected with the VCC end of MAX485EE chip by first inductance and first resistance; In described MAX485EE chip, B port is connected with the GND port of MAX485EE chip by second inductance and second resistor; First inductance in sending module is connected with second resistor connecting place with second inductance by a terminal resistance with first resistance connecting place; DE end and the RE end of described MAX485EE chip are connected and are connected with the P72/CLK2 of the elevator device controller in machine room; The R end of described MAX485EE chip is connected with the RXD2 end of the elevator device controller in machine room, and the T end of described MAX485EE chip is connected with the TXD2 end of the elevator device controller in machine room.
After described D/A modular converter simulation output, use L324 amplifier chip to illustrate as accompanying drawing 5, form voltage follower circuit, the load-carrying capacity of enhancement mode analog signal.
Specifically, in the time of actual samples, 4 pressure sensors can be evenly installed in car domain, this 4 road signal are amplified to shaping with 2 LM324, and the regulating voltage on every road uses adjustable resistance to complete the conditioning to sensor signal.In the circuit of specifically illustrating at accompanying drawing 2, the be input to+V of incoming signal Fen Si road of four pressure sensors
iNenter, the voltage range of every road input at 3V between 13V ,+V
1that adjustable resistance regulates reference voltage, output voltage V after two op amps amplification shapings of LM324N for every road
out.4 tunnel signal cycle of input gather the magnitude of voltage of 4 passages, and get its aviation value as output valve.
In machine room, elevator device controller is exported analog voltage after D/A conversion, communications reception to digital signal be converted to the simulation output the same with the observed reading in car.Signal in accompanying drawing 5, at the actual output numerical value through measuring, outputting analog signal after D/A conversion, carries out adjustment at zero point through LM324 op amp, can strengthen the load-carrying capacity of signal by voltage follower circuit.
Accompanying drawing 6 is illustrated interconnecting wiring diagram, four sensor die analog signals in car are input in AN1-AN4 passage, through AD conversion, send digital signal with RS485, the transmit port of RS485+12V, A, B, tetra-end points of GND, respectively with RS485 receiving port in machine room+12V, A, B, tetra-end points of GND are connected successively, machine room receives and sends digital signal, carry out after DA conversion the analog signal that final output measures from lift car.
The weighting apparatus of this lift car the inside is by the collection of the pressure signal of pressure sensor, analog signal is processed and converted the digital signal that can transmit with RS485 to, and the sensor model number using does not just have specific requirement, the measurement signal of input, as long as conversion becomes digital signal through A/D, just can be realized serial communication.Through the digital signal of RS485 transmission, can arrive the place beyond the car of RS485 receiver module, receive the elevator weighing value of measuring from car the inside in places such as machine rooms, and the digital signal of RS485 can not decay in transmitting procedure as analog signal, thereby realize harmless transmission.
Claims (6)
1. signal sampling and the transfer circuit of weighting apparatus in a lift car, it is characterized in that: comprise the pressure sensor being arranged in lift car, output voltage signal after described pressure sensor sampling, connect A/D conversion loop, the sampling front end circuit in described A/D conversion loop adopts op amp to carry out shaping school zero to the signal of described pressure sensor output, carry out A/D conversion analog signal is converted to digital signal, described A/D conversion loop connects RS485 serial communication transmission interface, be connected with the elevator device controller being provided with outside the lift car of RS485 receiver module again, described elevator device controller receives digital signal by RS485 serial communication receiving interface, by D/A conversion loop, digital signal is converted to simulation output.
2. signal sampling and the transfer circuit of weighting apparatus in lift car as claimed in claim 1, it is characterized in that: described pressure sensor is evenly arranged on car domain, be provided with four, amplify shaping with two op amp Dui Ci, tetra-road signals, the regulating voltage on every road uses adjustable resistance to complete the conditioning to pressure sensor signal.
3. signal sampling and the transfer circuit of weighting apparatus in lift car as claimed in claim 2, is characterized in that: AD conversion adopts M30620FCAFP chip, when conversion, by four tunnel analog inputs, is used as digital communication with aviation value.
4. signal sampling and the transfer circuit of weighting apparatus in lift car as claimed in claim 1 or 2, is characterized in that: described op amp adopts LM324 amplifier chip.
5. signal sampling and the transfer circuit of weighting apparatus in lift car as claimed in claim 1 or 2, is characterized in that: described RS485 serial ports sending and receiving interface all adopts MAX485EE chip.
6. signal sampling and the transfer circuit of weighting apparatus in lift car as claimed in claim 1 or 2, it is characterized in that: the described actual output numerical value receiving by RS485 serial communication receiving interface, through D/A conversion loop outputting analog signal, carry out adjustment at zero point through LM324 op amp, finally strengthen the load-carrying capacity of signal by voltage follower loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420172236.9U CN203903705U (en) | 2014-04-10 | 2014-04-10 | Signal sampling and transmitting circuit for weighing device in elevator compartment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420172236.9U CN203903705U (en) | 2014-04-10 | 2014-04-10 | Signal sampling and transmitting circuit for weighing device in elevator compartment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203903705U true CN203903705U (en) | 2014-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420172236.9U Expired - Fee Related CN203903705U (en) | 2014-04-10 | 2014-04-10 | Signal sampling and transmitting circuit for weighing device in elevator compartment |
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| CN (1) | CN203903705U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106586750A (en) * | 2016-12-28 | 2017-04-26 | 广东技术师范学院 | Load detection device, system and method |
| CN112125082A (en) * | 2020-08-17 | 2020-12-25 | 湖州慧微电子科技有限公司 | Elevator weighing measurement method based on strain induction |
-
2014
- 2014-04-10 CN CN201420172236.9U patent/CN203903705U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106586750A (en) * | 2016-12-28 | 2017-04-26 | 广东技术师范学院 | Load detection device, system and method |
| CN106586750B (en) * | 2016-12-28 | 2019-04-19 | 广东技术师范学院 | A kind of load-carrying detection device, system and method |
| CN112125082A (en) * | 2020-08-17 | 2020-12-25 | 湖州慧微电子科技有限公司 | Elevator weighing measurement method based on strain induction |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141029 Termination date: 20160410 |
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| CF01 | Termination of patent right due to non-payment of annual fee |