Elevator call-out cable detection equipment

Abstract

The utility model aims to provide elevator outbound cable detection equipment, which relates to the technical field of elevator outbound cable detection and comprises a dial switch SW2, a control unit, a display unit and an output unit. The dial switch SW2 is provided with five first access ends, and each first access end is electrically connected with one cable core of the outbound cable branch; the control unit is an AT89C52 single-chip microcomputer, and the output end of the dial switch SW2 is connected with the AT89C52 single-chip microcomputer. The display unit comprises a nixie tube driving chip 74HC573 and a two-digit nixie tube, the nixie tube driving chip 74HC573 is provided with five second access ends and five output ends, and each second access end is electrically connected with one cable core of the main cable of the outbound cable; the elevator outbound cable has the technical effects that the two ends of the five cable cores of the outbound cable are connected with the first incoming end and the second incoming end respectively, and under the condition that open circuit, grounding and short circuit do not exist in each cable core, the nixie tube driving chip 74HC573 can drive the two-digit nixie tube to automatically add 1 and count, and the problems of open circuit, short circuit or grounding and the like of the elevator outbound cable are automatically and efficiently detected.

Description

Technical Field

[0001] The utility model relates to the technical field of elevator outside call line detection, in particular to elevator outside call cable detection equipment. Background Art

[0002] The elevator call cable is a branch line connected in parallel from the main cable on each floor. Currently, it is necessary to manually use a multimeter to check whether the line has defects such as open circuit, short circuit or grounding, which is time-consuming and labor-intensive. In addition, after the cable is wound into a roll, the number of branches is difficult to count. Utility Model Content

[0003] The utility model aims to provide an elevator call cable detection device, which can automatically detect the break, short circuit or grounding of the elevator call cable through the cooperation of the dial switch SW2 and the AT89C52 single-chip microcomputer, and realize automatic counting.

[0004] To achieve the above object, the utility model provides the following technical solution: an elevator call cable detection device, comprising a dial switch SW2, a control unit, a display unit and an output unit;

[0005] The dip switch SW2 is provided with five first access terminals, each of which is electrically connected to a wire core of an outbound call cable branch;

[0006] The control unit is an AT89C52 single-chip microcomputer, and the output end of the dip switch SW2 is connected to the AT89C52 single-chip microcomputer;

[0007] The display unit includes a digital tube driving chip 74HC573 and two digital tubes, the digital tube driving chip 74HC573 is provided with five second access terminals and five output terminals, each second access terminal is electrically connected to a wire core of the main cable of the outbound call cable, and each output terminal is connected to the AT89C52 single chip microcomputer;

[0008] The control unit is an AT89C52 single-chip microcomputer with two third output terminals, and the third output terminals are electrically connected to the two-digit digital tubes via the digital tube driving chip 74HC573.

[0009] Preferably, the two ends of the five cores of the outbound call cable are connected to the first access end and the second access end respectively. If the five cores are not broken, short-circuited or grounded, the two-digit digital tube lights up and the displayed number is increased by 1.

[0010] Preferably, the output unit is an LED lamp.

[0011] Preferably, the output unit is a buzzer.

[0012] Preferably, the output unit is an LED light and a buzzer.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0014] The utility model designs an elevator outside call cable detection circuit, which specifically comprises a dial switch SW2, an AT89C52 single-chip microcomputer, a digital tube driving chip 74HC573 and two-digit digital tubes. The two ends of five wire cores of the outside call cable are respectively connected to a first access end and a second access end, and when each wire core does not have a broken circuit, grounding or short circuit, the digital tube driving chip 74HC573 will drive the two-digit digital tube to automatically add 1 and count, thereby realizing automatic and efficient detection of the broken circuit, short circuit or grounding of the elevator outside call cable and realizing automatic counting. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the circuit schematic diagram of the utility model;

[0016] Figure 2 This is the circuit schematic diagram of the utility model. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figure 1-2 , an elevator outbound call cable detection device, comprising a dial switch SW2, a control unit, a display unit and an output unit; the dial switch SW2 is provided with five first access terminals (respectively D3, D4, D5, D6, and D7), each of which is electrically connected to a wire core of an outbound call cable branch; the control unit is an AT89C52 single-chip microcomputer, the output terminal of the dial switch SW2 is connected to the AT89C52 single-chip microcomputer, and the connection endpoints are P1.0-P1.7; the display unit comprises a digital tube driver chip 74HC573 and a two-digit digital tube, the digital tube driver chip 74HC57 3. Five second access terminals (respectively D8, D9, D10, D11, and D12) and five output terminals (respectively Q3, Q4, Q5, Q6, and Q7) are provided, each second access terminal is electrically connected to a core of the main cable of the outbound call cable, each output terminal is connected to the AT89C52 single-chip microcomputer, and the connection endpoints are P2.0-P2.4; the control unit is provided with two third output terminals (the connection endpoints are P2.6-P2.7) for the AT89C52 single-chip microcomputer, and the third output terminals are electrically connected to the two-digit digital tube (the connection endpoint is 12) via the digital tube driving chip 74HC573.

[0019] Specifically, the outbound call cable is divided into a main cable and a branch cable. The main cable connects each floor, and the branch cable connects the buttons on each floor. To test whether there is a circuit break, short circuit or grounding between the main cable and the branch cable, the five cores of the main cable are connected to the five second access terminals (D8, D9, D10, D11, and D12), and the core signal of the main cable is amplified by the digital tube driver chip 74HC573 and connected to the connection terminals P2.0-P2.4; and the five cores of the branch cable are connected to the five first access terminals (D3, D4, D5, D6, and D7). During the test, the core of the branch cable is connected to the AT The connection endpoints P1.0-P1.7 of the 89C52 microcontroller send out high-level signals in turn. The core signal of the main cable is amplified by the digital tube driver chip 74HC573 and transmitted to the connection endpoints P2.0-P2.4 of the AT89C52 microcontroller. When P2.0-P2.4 detects that the received signal is consistent with the P1.0-P1.7 port and the state lasts for 500ms, it means that the elevator's external call cable has no short circuit, open circuit or virtual connection problems. At this time, the two-digit digital tube lights up and the displayed number increases by 1, that is, each time a correct external call cable is detected, the count of the two-digit digital tube increases by 1. Figure 1 00, after adding 1, it becomes Figure 2 01, to automatically and efficiently detect the open circuit, short circuit or grounding of the elevator call cable, and realize automatic counting, and so on. If the P1.0-P1.7 detection signal is inconsistent with the signal sent by the P1.0-P1.7 port, or the state cannot be maintained, it means that this circuit has a problem of open circuit, short circuit or virtual connection, and the two-digit digital tube lights up and the number displayed does not add 1, which proves that this circuit has a problem and workers need to rework.

[0020] The control unit is the two third output terminals of the AT89C52 microcontroller (the connection endpoints are P2.6-P2.7). The signals are amplified by the digital tube driver chip 74HC573 to control the two digital tubes (the connection endpoints are 12). Each time the test is successful, the number increases by 1.

[0021] See also Figure 1 and Figure 2 In order to further remind the detection personnel, the output unit is an LED light D1 and / or a buzzer BUZ1, that is, each time a correct outbound call cable is detected, a reminder is given through the LED light D1 and / or the buzzer BUZ1.

[0022] The main execution program code designed for the elevator call cable detection circuit is as follows:

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[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Elevator call cable detection equipment, characterized in that: It includes a dip switch SW2, a control unit, a display unit and an output unit; The dip switch SW2 is provided with five first access terminals, each of which is electrically connected to a wire core of an outbound call cable branch; The control unit is an AT89C52 single-chip microcomputer, and the output end of the dip switch SW2 is connected to the AT89C52 single-chip microcomputer; The display unit includes a digital tube driving chip 74HC573 and two digital tubes, the digital tube driving chip 74HC573 is provided with five second access terminals and five output terminals, each second access terminal is electrically connected to a wire core of the main cable of the outbound call cable, and each output terminal is connected to the AT89C52 single chip microcomputer; The control unit is an AT89C52 single-chip microcomputer with two third output terminals, and the third output terminals are electrically connected to the two-digit digital tubes via the digital tube driving chip 74HC573.

2. The elevator call cable detection device according to claim 1, characterized in that: The two ends of the five wire cores of the outbound call cable are connected to the first access end and the second access end respectively. If there is no open circuit, short circuit or grounding condition in the five wire cores, the two-digit digital tube lights up and the displayed number is increased by 1.

3. The elevator call cable detection device according to claim 1 or 2, characterized in that: The output unit is an LED lamp.

4. The elevator call cable detection device according to claim 1 or 2, characterized in that: The output unit is a buzzer.

5. The elevator call cable detection device according to claim 1 or 2, characterized in that: The output unit is an LED lamp and a buzzer.

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