CN213231254U

CN213231254U - Comprehensive measuring device for crane

Info

Publication number: CN213231254U
Application number: CN202022062460.0U
Authority: CN
Inventors: 鲁彬; 黄材学; 李泽宇; 陈磊; 乔伟
Original assignee: Wuhan Wanxi Intelligent Technology Co ltd
Current assignee: Wuhan Wanxi Intelligent Technology Co ltd
Priority date: 2020-09-19
Filing date: 2020-09-19
Publication date: 2021-05-18
Anticipated expiration: 2030-09-19

Abstract

The utility model provides a hoist integrated measuring device, including a plurality of stress sensor, a plurality of vibration sensor, voltage current conversion circuit, current-voltage conversion circuit, AD conversion module and controller. The stress sensors and the vibration sensors are respectively arranged at different parts of the crane, the output ends of the stress sensors and the vibration sensors are sequentially connected with the controller through the voltage-current conversion circuit, the current-voltage conversion circuit and the AD conversion module, and the controller is connected with the upper computer through the USB interface. The utility model discloses accessible stress sensor and the trouble and the ageing degree of vibration sensor monitoring hoist each position carry out comprehensive measurement to the hoist, and the monitoring is more comprehensive.

Description

Comprehensive measuring device for crane

Technical Field

The utility model relates to a hoist comprehensive measurement technical field especially relates to a hoist comprehensive measurement device.

Background

Crane measurement is a common means for preventing crane accidents, and can determine the current running state of a crane and estimate the remaining service life of the crane. The crane measuring device can monitor the state of the crane in real time, but can monitor the state information of a certain aspect of the crane mostly, and the monitoring of the crane is not comprehensive enough.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a measuring device is synthesized to hoist to solve the incomplete problem of traditional hoist measuring device to the monitoring of hoist.

The technical scheme of the utility model is realized like this: a comprehensive measuring device of a crane comprises a plurality of stress sensors, a plurality of vibration sensors, a voltage-current conversion circuit, a current-voltage conversion circuit, an AD conversion module and a controller;

it is a plurality of stress sensor and a plurality of vibration sensor installs respectively in the different positions of hoist, stress sensor reaches vibration sensor's output passes through in proper order voltage current conversion circuit current voltage conversion circuit AD conversion module connects the controller, the controller passes through the host computer of USB interface connection.

Optionally, the stress sensor is composed of a strain gauge and a wheatstone circuit, and the vibration sensor includes a BF1K-3AA type strain gauge or an H36-2-2 ceramic vibration sensor.

Optionally, the voltage-current conversion circuit includes an operational amplifier U1, an NPN transistor Q1, and resistors R1 to R6;

the output end of the stress sensor or the vibration sensor is connected with the non-inverting input end of an operational amplifier U1 through a resistor R1, the output end of the operational amplifier U1 is connected with the base electrode of a triode Q1 through a resistor R2, a power supply VCC is sequentially connected with the non-inverting input end of an operational amplifier U1 through the collector electrode of a triode Q1, the emitter electrode of a triode Q1, a resistor R6 and a resistor R5, the emitter electrode of the triode Q1 and the common end of the resistor R6 are sequentially grounded through a resistor R4 and a resistor R3, the common end of the resistor R4 and the resistor R3 is connected with the inverting input end of an operational amplifier U1, and the common end of the resistor R6 and the resistor R5 is connected with the.

Optionally, the voltage-current conversion circuit further includes a variable resistor R7, and the variable resistor R7 is connected in series with the resistor R4.

Optionally, the voltage-current conversion circuit further includes an IN4001 diode D1, and a base of the transistor Q1 is grounded through a cathode of the diode D1 and an anode of the diode D1 IN sequence.

Optionally, the current-voltage conversion circuit includes a resistor R8, an output terminal of the voltage-current conversion circuit is grounded via a resistor R8, and a common terminal of the output terminal of the voltage-current conversion circuit and the resistor R8 is connected to an input terminal of the AD conversion module.

Optionally, the AD conversion module is in a differential input mode, the crane comprehensive measurement device further includes a single-ended to differential circuit, and the single-ended to differential circuit is connected between the output end of the current-voltage conversion circuit and the input end of the AD conversion module.

Optionally, the single-ended to differential circuit includes an AD8132 chip U2 and resistors R9 to R14;

the output end of the current-voltage conversion circuit is connected with an IN + pin of an AD8132 chip U2 through a resistor R9, an OUT + pin and an OUT-pin of the AD8132 chip U2 are respectively connected with a differential input end of the AD conversion module, the IN-pin of the AD8132 chip U2 is sequentially grounded through a resistor R10 and resistors R11 and R12 which are connected IN parallel, the OUT + pin of the AD8132 chip U2 is also connected with the IN-pin of the AD8132 chip U2 through a resistor R13, and the OUT-pin of the AD8132 chip U2 is also connected with the IN + pin of the AD8132 chip U2 through a resistor R14.

Optionally, the AD conversion module includes an AD9235 chip.

The utility model discloses a hoist integrated measurement device has following beneficial effect for prior art:

(1) the utility model can monitor the fault and aging degree of each position of the crane through the stress sensor and the vibration sensor, and comprehensively measure the crane, so that the monitoring is more comprehensive;

(2) the voltage signal which is output by the sensor and easy to be interfered is converted into a current signal which is not easy to be interfered through the voltage-current conversion circuit to be transmitted remotely, then the current signal is converted into a voltage signal to be subjected to AD conversion in a centralized mode, and the converted digital signal is sent to the upper computer in a unified mode, so that a communication protocol control module is saved, signal interference is reduced, and the centralized transmission is also convenient for maintenance and upgrading in the future.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a block diagram of the comprehensive measuring device of the crane of the present invention;

fig. 2 is a circuit diagram of the voltage-current conversion circuit, the current-voltage conversion circuit and the single-ended to differential conversion circuit of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.

As shown in fig. 1, the crane comprehensive measurement device of the present embodiment includes a plurality of stress sensors, a plurality of vibration sensors, a voltage-current conversion circuit, a current-voltage conversion circuit, an AD conversion module, and a controller. The stress sensors and the vibration sensors are respectively arranged at different parts of the crane, the output ends of the stress sensors and the vibration sensors are sequentially connected with the controller through the voltage-current conversion circuit, the current-voltage conversion circuit and the AD conversion module, and the controller is connected with the upper computer through the USB interface.

The stress sensor is preferably composed of a strain gauge and a Wheatstone circuit in the embodiment, the vibration sensor comprises a BF1K-3AA type strain gauge or an H36-2-2 type ceramic vibration sensor, the controller comprises an FPGA chip EP3C16F484C8N, the USB interface comprises a USB3.0 interface control chip CYUSB3014, the EP3C16F484C8N chip is a main control chip and is responsible for collecting, receiving, storing and uploading information in the whole system, the USB3.0 interface chip is used as an expansion interface of the FPGA and provides a USB3.0 transmission interface for the FPGA, and an ARM9 chip in the USB3.0 interface chip is an auxiliary control chip and is used for configuring the interface chip.

In this embodiment, the stress sensor can be used for detecting the ageing degree of different partial materials of hoist, and the vibration sensor can be used for detecting the type of hoist check point trouble and the time of production, and the detected signal of stress sensor and vibration sensor output is carried to AD conversion module through voltage current conversion circuit, current-voltage conversion circuit in proper order and is carried out AD conversion, and AD conversion module output digital signal to controller, and the controller sends the detected data to the host computer through the USB interface and carries out data analysis. Therefore, the fault and the aging degree of each position of the crane can be monitored through the stress sensor and the vibration sensor, the crane is comprehensively measured, and the monitoring is more comprehensive. The stress sensor, the vibration sensor and the voltage-current conversion circuit are arranged at the position of the crane, the current-voltage conversion circuit, the AD conversion module and the controller are arranged in the remote monitoring center, and signals output by the voltage-current conversion circuit are transmitted to the remote monitoring center for current-voltage conversion through long-distance cables.

In addition, in this embodiment, the signal needs to be transmitted to a specific location for processing and then analyzed by the upper computer, so that the stability of the signal needs to be considered in such a long distance transmission. It is a method to convert the analog signal outputted by the sensor into digital signal in situ and then to upload it to the upper computer for analysis by a proper data transmission protocol, but this requires that each sensor must be added with an AD conversion module and a data transceiver (communication protocol control module), which is quite troublesome and costly for a large number of test points, and the digital circuit part needs some protection measures. In the embodiment, an analog signal (mainly a voltage signal) which is output by a sensor and easy to interfere is converted into a current signal which is difficult to interfere through a voltage-current conversion circuit for long-distance transmission, then the current signal is converted into a voltage signal for centralized AD conversion, and the converted digital signal is uniformly transmitted to an upper computer.

As shown in fig. 2, the voltage-current conversion circuit of the present embodiment includes an operational amplifier U1, an NPN transistor Q1, and resistors R1 to R6. The output end of the stress sensor or the vibration sensor is connected with the non-inverting input end of an operational amplifier U1 through a resistor R1, the output end of the operational amplifier U1 is connected with the base electrode of a triode Q1 through a resistor R2, a power supply VCC is sequentially connected with the non-inverting input end of an operational amplifier U1 through the collector electrode of a triode Q1, the emitter electrode of a triode Q1, a resistor R6 and a resistor R5, the common end of the emitter electrode of the triode Q1 and the resistor R6 is sequentially grounded through a resistor R4 and a resistor R3, the common end of the resistor R4 and the resistor R3 is connected with the inverting input end of the operational amplifier U1, and the common end of the resistor R6 and the resistor R5 is.

The operational amplifier U1, the resistor R1 and the resistor R3 form an amplifying circuit, the resistor R4 and the resistor R5 are feedback loops of the amplifying circuit, and are used for amplifying and outputting signals output by the sensor, and the signals are converted into current signals through the resistor R2 and used for generating current signals required for driving the triode Q1. The values of the resistors R3, R4, R1 and R5 can be adjusted to R3 ═ R4 and R1 ═ R5, and if the resistance values of R1+ R5 are much larger than that of R6, the output current in a linear relationship with the input voltage can be obtained by adjusting the resistance value of R6.

Further, the voltage-current conversion circuit of the present embodiment further includes a variable resistor R7, and the variable resistor R7 is connected in series with the resistor R4. The variable resistor R7 is used to prevent deviation between theoretical calculation and actual result due to problems such as actual resistance accuracy, and the deviation can be eliminated by adjusting the resistance of the variable resistor R7.

Further, the voltage-current conversion circuit of the present embodiment further includes an IN4001 diode D1, and the base of the transistor Q1 is grounded through the cathode of the diode D1 and the anode of the diode D1 IN sequence. Diode D1 is used for rectification and amplitude limiting, and avoids the burning out of transistor Q1 due to excessive base current.

As shown in fig. 2, the current-voltage conversion circuit of the present embodiment includes a resistor R8, an output terminal of the voltage-current conversion circuit is grounded via a resistor R8, and a common terminal of the output terminal of the voltage-current conversion circuit and a resistor R8 is connected to an input terminal of the AD conversion module. The resistor R8 is used for converting the current signal output by the voltage-current conversion circuit into a voltage signal.

Further, in this embodiment, it is preferable that the AD conversion module is a differential input mode, the crane integrated measurement apparatus further includes a single-ended to differential circuit, the single-ended to differential circuit is connected between the output terminal of the current-voltage conversion circuit and the input terminal of the AD conversion module, and the AD conversion module preferably includes an AD9235 chip. The AD conversion module with the differential input mode can improve the acquisition precision of the sensor signal, so that the single-ended voltage signal output by the current-voltage conversion circuit needs to be converted into differential output through a single-ended-to-differential circuit.

Specifically, as shown in fig. 2, the single-ended to differential circuit includes an AD8132 chip U2 and resistors R9 to R14. The output end of the current-voltage conversion circuit is connected with an IN + pin of an AD8132 chip U2 through a resistor R9, an OUT + pin and an OUT-pin of the AD8132 chip U2 are respectively connected with a differential input end of an AD conversion module, the IN-pin of the AD8132 chip U2 is sequentially grounded through a resistor R10 and resistors R11 and R12 which are connected IN parallel, the OUT + pin of the AD8132 chip U2 is also connected with the IN-pin of the AD8132 chip U2 through a resistor R13, and the OUT-pin of the AD8132 chip U2 is also connected with the IN + pin of the AD8132 chip U2 through a resistor R14. The resistor R13 and the resistor R14 are feedback resistors, and the resistance values of the two resistors are the same. The balance degree of the differential signals output by the AD8132 chip is very high, the balance degree is determined by the characteristics of the chip, and the matching degree of the ratio of the feedback resistance and the gain resistance of the two feedback networks is not depended on, so that the balance degree of the output cannot be influenced even if the resistances of the feedback networks are not matched. The common-mode level of the differential signal output by the AD8132 chip can be simply set by an input pin Vocm, which is very simple and convenient for driving an AD conversion module with single power supply differential input, and the level of the differential signal can be set in the input range required by the AD conversion module.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A comprehensive measuring device of a crane is characterized by comprising a plurality of stress sensors, a plurality of vibration sensors, a voltage-current conversion circuit, a current-voltage conversion circuit, an AD conversion module and a controller;

the stress sensor and the vibration sensor are respectively installed at different positions of the crane, the output end of the stress sensor and the output end of the vibration sensor sequentially pass through the voltage-current conversion circuit, the current-voltage conversion circuit and the AD conversion module to be connected with the controller, and the controller is connected with an upper computer through a USB interface.

2. The integrated measuring device of crane as claimed in claim 1, wherein the stress sensor is composed of strain gauge and Wheatstone circuit, and the vibration sensor comprises BF1K-3AA strain gauge or H36-2-2 ceramic vibration sensor.

3. The crane comprehensive measurement device as claimed in claim 1, wherein the voltage-current conversion circuit comprises an operational amplifier U1, an NPN triode Q1, and resistors R1-R6;

4. The integrated measuring device of the crane as claimed in claim 3, wherein the voltage-current converting circuit further comprises a variable resistor R7, and the variable resistor R7 is connected in series with the resistor R4.

5. The integrated measuring device of the crane as claimed IN claim 3, wherein the voltage-current converting circuit further comprises an IN4001 diode D1, and the base of the triode Q1 is grounded through the cathode of the diode D1 and the anode of the diode D1 IN sequence.

6. The comprehensive measuring device of the crane as claimed in claim 1, wherein the current-voltage converting circuit comprises a resistor R8, the output terminal of the voltage-current converting circuit is connected to the ground through a resistor R8, and the output terminal of the voltage-current converting circuit and the common terminal of the resistor R8 are connected to the input terminal of the AD converting module.

7. The integrated measuring device of claim 1, wherein the AD converter module is a differential input type, and the integrated measuring device further comprises a single-ended to differential circuit, and the single-ended to differential circuit is connected between the output terminal of the current-voltage converter circuit and the input terminal of the AD converter module.

8. The crane comprehensive measurement device as claimed in claim 7, wherein the single-ended to differential circuit comprises an AD8132 chip U2, resistors R9-R14;

9. The comprehensive measuring device of the crane as claimed in claim 1, wherein the AD conversion module comprises an AD9235 chip.