CN219435019U - Electric hoist electric leakage centralized detection system - Google Patents

Abstract

The utility model relates to the technical field of building construction, and particularly discloses a centralized electric hoist leakage detection system with high detection efficiency and no influence on site construction, which comprises a current transformer, a leakage detection circuit for detecting leakage signals, a leakage circuit breaking control circuit, a singlechip for receiving the output signals of the leakage detection circuit and controlling the starting time sequence of an electric hoist, and a touch screen for displaying the leakage current of each electric hoist and inputting an electric hoist starting and stopping instruction, wherein the current transformer is electrically connected with a plurality of parallel electric hoists; the leakage detection circuit comprises a triode for accessing a leakage signal of the current transformer and an A/D analog-to-digital conversion module electrically connected with the triode, and the leakage circuit breaking control circuit comprises a leakage circuit breaker electrically connected with the current transformer and a leakage switch connected with the leakage circuit breaker, wherein the leakage switch is electrically connected with a plurality of electric hoists to control the on-off of the electric hoists and the current transformer; the singlechip is electrically connected with the A/D analog-to-digital conversion module; the touch screen is in communication connection with the singlechip.

Description

Electric hoist electric leakage centralized detection system

Technical Field

The utility model relates to the technical field of building construction, in particular to a centralized electric hoist electric leakage detection system.

Background

When the climbing frame control system works, a plurality of electric hoist motors are often involved to work simultaneously, and at most 50-60 electric hoist motors of one group of system can be started simultaneously sometimes. Because the building site environment is abominable, receive bumping and pounding and rainwater or building site to apply water and maintain the influence of concrete, the insulating nature of electric hoist reduces, probably appears the electric leakage, and then causes the switch tripping operation. The electric hoist leakage detection is usually to test the insulation resistance of the phase line of the motor to the shell under the condition that the hoist is not electrified, and the detection of which motor causes the tripping of a switch is troublesome under the condition that the number of the electric hoist is large; in addition, the conventional leakage switch of the construction site can be tripped when only one or a plurality of electric hoist is started, and the conventional leakage switch of the construction site can be tripped when the leakage current is larger than or equal to 30MA, and the single hoist is leaked by 5MA, so that the trip can be performed when 6 electric hoist is started, under the condition, the trip of the switch caused by the leakage of which electric hoist or electric hoist is difficult to judge, and the trip times are more, so that the power utilization of other work types of projects can be influenced, the trip of a multi-stage distribution box of the construction site can be caused after the power is electrified, and the other power utilization can be influenced. At present, current leakage detection is mainly adopted to realize the leakage detection of the electric hoist.

The general way of leakage current detection is: and detecting three phase lines and one zero line simultaneously through a clamp ammeter, and observing whether the vector sum of currents is 0. Because the detection mode of whether the current display of the clamp ammeter is 0 needs to be singly detected under the condition of starting the motor, and the detection times are more under the condition of more electric hoist, the detection mode is complex and has lower detection efficiency; in addition, when the leakage current exceeds 30MA current, the leakage switch tends to disconnect the power supply, thereby affecting field construction.

Disclosure of Invention

In view of the above, it is necessary to provide a centralized detection system for electric hoist leakage, which has high detection efficiency and no influence on site operation.

The electric hoist electric leakage centralized detection system comprises a current transformer, an electric leakage detection circuit for detecting electric leakage signals, an electric leakage circuit breaking control circuit, a single chip microcomputer for receiving the output signals of the electric leakage detection circuit and controlling the starting time sequence of the electric hoist, and a touch screen for displaying the electric leakage current of each electric hoist and inputting an electric hoist starting and stopping instruction, wherein the current transformer is electrically connected with a plurality of electric hoists which are connected in parallel; the leakage detection circuit comprises a triode for accessing leakage signals of the current transformer and an A/D analog-to-digital conversion module electrically connected with the triode, the leakage circuit breaking control circuit comprises a leakage circuit breaker electrically connected with the current transformer and a leakage switch connected with the leakage circuit breaker, and the leakage switch is respectively electrically connected with a plurality of electric hoist to control the on-off of the electric hoist and the current transformer; the singlechip is electrically connected with the A/D analog-to-digital conversion module; the touch screen is in communication connection with the singlechip.

In one embodiment, the electric hoist electric leakage centralized detection system further comprises a timer electrically connected with the single chip microcomputer and each electric hoist.

In one embodiment, the electric hoist electric leakage centralized detection system further comprises a relay which is electrically connected with the single chip and used for controlling the start and stop and the forward and reverse rotation of each electric hoist.

In one embodiment, the single chip microcomputer includes a storage module for storing the leakage current signal sent by the a/D analog-to-digital conversion module.

In one embodiment, the electric hoist leakage centralized detection system further comprises a power supply circuit for providing three-phase current for the electric hoist.

In one embodiment, a rectifier bridge is connected between the current transformer and the residual current circuit breaker.

In one embodiment, the singlechip is in communication connection with the touch screen through an RS485 interface.

In one embodiment, the touch screen is a resistive touch liquid crystal display.

According to the electric hoist electric leakage centralized detection system, the starting time sequence of the electric hoist is controlled through the single chip microcomputer, so that the electric hoist is started one by one and is connected with the current transformer, and an electric leakage signal output by the current transformer is transmitted to the electric leakage breaker, so that the electric leakage breaker can timely control the electric leakage switch to disconnect the electric hoist, and the influence of tripping and disconnecting a power supply on field construction operation is avoided; meanwhile, the leakage signal output by the current transformer is transmitted to the touch screen for display through the leakage detection circuit and the singlechip, so that the visualization of the detection result is realized, the singlechip controls the start-stop time sequence of the electric hoist, the automation of leakage detection is realized, the problem of low detection efficiency caused by starting the motors one by one is avoided, the difficulty of leakage detection is reduced, and the detection efficiency is improved.

Drawings

FIG. 1 is a schematic block diagram of a centralized detection system for electric hoist leakage in an embodiment of the present utility model;

FIG. 2 is a schematic circuit diagram of a leakage detection circuit according to an embodiment of the present utility model;

FIG. 3 is a schematic circuit diagram of a leakage circuit breaker control circuit in accordance with one embodiment of the present utility model;

FIG. 4 is a schematic circuit diagram of a power supply circuit in one embodiment of the utility model;

fig. 5 is a flowchart of a centralized detection system for electric hoist leakage in an embodiment of the present utility model.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

Aiming at the problems that the efficiency is low and the overall construction operation progress of the site is affected when a power supply is disconnected by a leakage switch due to the fact that a clamp ammeter is adopted for one-by-one test in the electric hoist leakage detection of the current construction site, the utility model provides the electric hoist leakage centralized detection system which is high in detection efficiency and has no influence on the site construction. Referring to fig. 1-3 and fig. 5, the electric hoist leakage centralized detection system of the present embodiment includes a current transformer 100 for converting the current electric hoist leakage current, a leakage detection circuit 200 for detecting the leakage signal, a leakage circuit breaker control circuit 300 for breaking the electric hoist when the leakage current reaches a predetermined value, a singlechip 400 for receiving the output signal of the leakage detection circuit 200 and controlling the start time sequence of the electric hoist, and a touch screen 500 for displaying the leakage current of each electric hoist and inputting the start and stop command of the electric hoist. The current transformer 100 is configured to convert a primary large current flowing through the electric hoist into a secondary small current, so that sampling detection of leakage current in a circuit system is realized, the collected leakage current (small current) is transmitted to the leakage detection circuit 200 for signal conversion, and then is further transmitted to the singlechip 400 for operation, and the singlechip 400 outputs an operation result to the touch screen 500 for display, so that visualization of leakage detection is realized. In addition, in this embodiment, the singlechip 400 controls the time sequence of starting and stopping of each electric hoist, so that each electric hoist is sequentially powered on, so that only one electric hoist is connected to the leakage detection circuit 200 during one detection period, and the leakage current value finally displayed on the touch screen 500 can truly reflect the leakage current of the electric hoist with a preset positioning sequence, thereby checking the leakage condition of each electric hoist in a construction site, and realizing one-by-one and automatic detection of the leakage current of each electric hoist.

Specifically, in this embodiment, the current transformer 100 is electrically connected to a plurality of parallel electric hoists; the leakage detection circuit 200 comprises a triode for accessing the leakage signal of the current transformer 100, and an a/D analog-to-digital conversion module electrically connected with the triode, and the leakage circuit breaking control circuit 300 comprises a leakage circuit breaker electrically connected with the current transformer 100 and a leakage switch connected with the leakage circuit breaker, wherein the leakage switch is respectively electrically connected with a plurality of electric hoist to control the on-off of the electric hoist and the current transformer 100, that is, in the embodiment, the plurality of electric hoist are controlled to be disconnected through one leakage switch, when the leakage current reaches a rated value, the plurality of electric hoist connected with the leakage switch are controlled to be disconnected, namely the current leakage of the current electric hoist is judged, and the influence of tripping and outage on the operation of a construction site is avoided. Preferably, in this embodiment, when the rated leakage current detected by the leakage breaker is, for example, 30MA (or other set values), the leakage breaker controls the leakage switch to be turned off, so that the plurality of electric hoists lose electricity. In other embodiments, when the singlechip 400 controls the electric hoist with a preset bit sequence to start, the singlechip 400 stores the serial number value and corresponding information of the electric hoist at the same time, so as to report the information of the electric hoist to the touch screen in time when the electric hoist is powered off.

In this embodiment, the single-chip microcomputer 400 is electrically connected to the a/D analog-to-digital conversion module, and is configured to receive the leakage current signal sent by the a/D analog-to-digital conversion module, and operate the leakage current signal, so that the value of the leakage current is reduced to the magnitude of the true value, and is displayed on the touch screen 500. The touch screen 500 is in communication with the single chip 400. Preferably, the singlechip 400 is in communication connection with the touch screen 500 through an RS485 interface. The touch screen 500 is used as an output terminal of the single-chip microcomputer 400 for displaying the leakage current after operation, and the touch screen 500 is used as an input terminal of the single-chip microcomputer 400 for inputting instructions to the single-chip microcomputer 400. Preferably, the touch screen 500 is a resistive touch liquid crystal display.

In addition, in the embodiment, the control of the singlechip 400 on the start-stop time sequence of the electric hoist comprises two modes, one is an automatic mode default by the system, and the singlechip 400 sequentially controls the start-stop time sequence of each electric hoist; and secondly, in a manual mode, a command is input to the single-chip microcomputer 400 through the touch screen 500, so that the single-chip microcomputer 400 executes start-stop operation of the electric hoist corresponding to the command. Further, in this embodiment, the priority of the manual mode is higher than the priority of the automatic mode.

In order to realize the control of the start-stop time sequence of the electric hoist by the single-chip microcomputer 400 in the automatic mode, in one embodiment, the electric hoist electric leakage centralized detection system further comprises a timer electrically connected with the single-chip microcomputer 400 and each electric hoist, and by setting the timer, the single-chip microcomputer 400 can set parameters such as the start-stop time of each electric hoist, the power-on duration of each electric hoist and the like according to the time information sent by the timer, so that the start-stop time of each electric hoist is different, and the electric hoist electric leakage detection one by one is realized.

In one embodiment, the centralized detection system for electric hoist leakage further includes a power supply circuit 600 for providing three-phase current to the electric hoist, so as to ensure normal operation of the electric hoist after starting. In this embodiment, the power supply circuit 600 for supplying three-phase current is adopted because the power of the electric hoist at the construction site is large and the rated voltage required for normal operation is high. Of course, the power supply circuit 600 shown in fig. 4 may be used to supply voltage to the electric hoist in addition to the voltage boosting device.

Referring to fig. 2, the leakage detection circuit 200 of the present embodiment includes a triode, a relay KD, and a wiring row CN5 connected in sequence, wherein an output end of the wiring row CN5 is connected to a plurality of resistors and electrically connected to an IC integrated circuit U5, and the IC integrated circuit U5 includes an a/D conversion module for implementing an analog-to-digital conversion of a signal amplified by the triode, so as to convert an electrical signal into a digital signal and send the digital signal to the single chip 400.

Referring to fig. 3, a rectifier bridge is connected between the current transformer 100 and the leakage breaker. Preferably, the rectifier bridge is a full wave rectifier bridge. By providing the rectifier bridge, the three-phase ac power provided by the power supply circuit 600 can be converted into dc voltage, so as to facilitate the detection of the leakage voltage by the leakage circuit breaker. In this embodiment, one end of the rectifier bridge is connected to the diode T1, the resistor R3, the resistor R4, the resistor R5, the resistor R6, the capacitor C1, the capacitor C2, and the resistor R7 and is connected to the a pin of the leakage circuit breaker, and the other end of the rectifier bridge is connected to the diode T2 and the resistor R8 and is connected to the b pin of the leakage circuit breaker.

Referring to fig. 5, in this embodiment, the system includes No. 1-60 electric hoist to be detected (i.e. extension), when the detection system works and detects the leakage current of the electric hoist, the touch screen firstly sends an instruction to the singlechip 400 to enter a predetermined working mode (automatic mode or manual mode), and then each electric hoist is started under the control of the instruction sent by the singlechip 400, or each electric hoist is started and stopped sequentially according to the order of No. 1-60, or the start and stop of a certain electric hoist can be realized according to the instruction sent by the singlechip 400. After the electric hoist with a preset bit sequence is started, sampling is performed through the current transformer 100, the leakage detection circuit 200 is used for detecting, electric measurement of leakage current is achieved, the detected leakage current value is stored in the single-chip microcomputer 400, and the single-chip microcomputer 400 further transmits the leakage current value to the touch screen 500 for display.

Further, in this embodiment, the electric hoist electric leakage centralized detection system further includes a relay electrically connected with the single-chip microcomputer 400 and used for controlling start, stop and forward and reverse rotation of each electric hoist, and in the process of starting and electric leakage detection of the electric hoist, the single-chip microcomputer 400 controls the current detected electric hoist to sequentially forward rotate and reverse rotate through the relay so as to determine the electric leakage current of the electric hoist, and the electric hoist detects the electric leakage current under the condition of forward and reverse rotation in advance, so that the accuracy of electric leakage current detection can be improved so as to reduce errors.

In this embodiment, the singlechip 400 includes a storage module for storing the leakage current signal sent by the a/D analog-to-digital conversion module. Preferably, the storage module comprises storage channels corresponding to the electric hoist one by one, and serial number information, start-stop time information and leakage current information of the electric hoist are stored in each storage channel, so that the time recorded by each storage channel corresponds to one electric hoist uniquely, and interference between information is avoided. In addition, in this embodiment, the electric hoist electric leakage centralized detection system further includes an instruction detection module electrically connected to the single-chip microcomputer 400 and each electric hoist and used for detecting instructions of the single-chip microcomputer 400, where the instruction detection module is used to analyze instruction information sent by the single-chip microcomputer 400 and convert the instruction information into an electric signal to control the start and stop of the corresponding electric hoist.

According to the electric hoist electric leakage centralized detection system, the starting time sequence of the electric hoist is controlled through the single chip microcomputer 400, so that the electric hoist is started one by one and is connected with the current transformer 100, and an electric leakage signal output by the current transformer 100 is transmitted to the electric leakage breaker, so that the electric leakage breaker can timely control the electric leakage switch to disconnect the electric hoist, and the influence of tripping and disconnecting a power supply on site construction operation is avoided; meanwhile, the leakage signal output by the current transformer 100 is transmitted to the touch screen 500 for display through the leakage detection circuit 200 and the singlechip 400, so that the visualization of the detection result is realized, the singlechip 400 controls the start-stop time sequence of the electric hoist, the automation of leakage detection is realized, the problem of low detection efficiency caused by starting the motors one by one is avoided, the difficulty of leakage detection is reduced, and the detection efficiency is improved.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (8)

1. The electric hoist electric leakage centralized detection system is characterized by comprising a current transformer, an electric leakage detection circuit for detecting electric leakage signals, an electric leakage circuit breaking control circuit, a singlechip for receiving the output signals of the electric leakage detection circuit and controlling the starting time sequence of the electric hoist, and a touch screen for displaying the electric leakage current of each electric hoist and inputting an electric hoist starting and stopping command, wherein the current transformer is electrically connected with a plurality of electric hoists which are connected in parallel; the leakage detection circuit comprises a triode for accessing leakage signals of the current transformer and an A/D analog-to-digital conversion module electrically connected with the triode, the leakage circuit breaking control circuit comprises a leakage circuit breaker electrically connected with the current transformer and a leakage switch connected with the leakage circuit breaker, and the leakage switch is respectively electrically connected with a plurality of electric hoist to control the on-off of the electric hoist and the current transformer; the singlechip is electrically connected with the A/D analog-to-digital conversion module; the touch screen is in communication connection with the singlechip.

2. The electric hoist electric leakage centralized detection system of claim 1, further comprising a timer electrically connected with the single chip microcomputer and each electric hoist.

3. The electric hoist leakage centralized detection system of claim 2, further comprising a relay electrically connected to the monolithic computer and configured to control start-stop and forward-reverse rotation of each electric hoist.

4. The electric hoist leakage centralized detection system of claim 3, wherein the single-chip microcomputer comprises a storage module for storing leakage current signals sent by the A/D analog-to-digital conversion module.

5. The electric block leakage concentration detection system of claim 4, further comprising a power supply circuit for providing three-phase current to the electric block.

6. The electric hoist electric leakage centralized detection system of claim 5, wherein a rectifier bridge is connected between the current transformer and the electric leakage breaker.

7. The electric hoist electric leakage centralized detection system of claim 6, wherein the single-chip microcomputer is in communication connection with the touch screen through an RS485 interface.

8. The electric hoist leakage centralized detection system of claim 7, characterized in that the touch screen is a resistive touch liquid crystal display.