CN2246649Y - Alarm for indicating lifting height of crane hook - Google Patents

Abstract

The utility model relates to an indicating alarm for the lifting height of a lift hook of a crane. The indicating alarm for the lifting height of a lift hook of a crane is characterized in that a photoelectric rotational speed sensor is connected with a rotating shaft of a lifting winding drum of the crane. The angular displacement of the rotating angle of the winding drum is changed into electric pulse signals, and the electric pulse signals are input in an input microcomputer minimum system through a photoisolator and a driver; simultaneously, relay contact switching signals which reflect the forward rotation and the inverse rotation are also transmitted into the microcomputer minimum system; detection contents are output through the operation, the processing and the judgement of user programs, and through a signal identification circuit. The utility model, which can display the lifting height of the lift hook of the crane at any time, has the intiutive property and the reliability. Once the limit is exceeded, alarm signals and protection control signals are immediately output; the user programs can be set, and the utility model can be integrated with other safety alarms into one for use.

Description

Crane hook lifting altitude indication annunciator

The utility model relates to the suspension hook lifting altitude indication annunciator that a kind of winch that hoists, particularly rubber tired crane, transfer crane and crane in bridge type are used, and belongs to measurement, test class.

In known technology, the crane hook lifting altitude is generally with driver range estimation, when suspension hook is promoted to the crane arm ora terminalis, backs down the running that limit switch on the crane arm ora terminalis is controlled hoisting drum by the block on the suspension hook.The crane arm that prevents hoisting drum from remaining in operation and produce engine-damaged accident such as tumble backward, its weak point is the essential range estimation of crane driver operation, when estimating suspension hook lifting altitude position, as under the harbour bank crane situation that the driver can't look at straight during handling goods in to cabin, easily have an accident, and block, the in a single day malfunctioning meeting of limit switch cause machine to ruin accident.

The purpose of this utility model provides and a kind ofly can reflect the crane hook lifting altitude in driver driving indoor directly demonstration by numeral, and surpasses the crane hook lifting altitude indication annunciator that predetermined value can be reported to the police.

The purpose of this utility model can reach by following measure:

Crane hook lifting altitude indication annunciator has the plunging joint that links to each other with the rotating shaft of crane hoisting reel, its special character is to also have: the photoelectric sensor that fuses with plunging joint, photoisolator, crane hoisting motor relay contact switch, actuator (74LS244), or door (74LS32), single chip microcomputer (80C31) chip, program register (2732), address latch (74LS373), the microcomputer minimum system that monitoring device is formed, signal recognition circuit, sound, light, Display and Alarm Circuit; Wherein:

During hoisting drum rotating shaft rotation, corner displacement is changed into electric impulse signal by photoelectric sensor, through photoisolator, actuator (74LS244), the input microcomputer chases after minimum system;

The relay contact switch signal of its forward and backward of reflection that links to each other with hoisting drum lifting motor control loop is also through photoisolator, and actuator (74LS244) is imported microcomputer and chased after minimum system;

Or door (74LS32) pin 1,19 that connects 27,17 pin of single chip microcomputer (80C31) of microcomputer minimum system and actuator (74LS244) constitutes and drives gating signals;

Phase inverter (74LS04), actuator (241), phase inverter (74LS04), form signal recognition circuit, connect single chip microcomputer (80C31) the chip pin 10,11 of microcomputer minimum system with door (74LS08), the parallel Output Shift Register (74LS164) of serial, touch formula button;

Sound, light.Display and Alarm Circuit connects single chip microcomputer (80C31) the chip delivery port of microcomputer minimum system.

Fig. 1 is the utility model embodiment schematic diagram

When crane hook promotes goods, hoisting drum rotating shaft rotation, the optical code disk that plunging joint drives photoelectric sensor (1) also rotates thereupon, during photosensitive tube in it and sensitization, the time and not sensitization, produce electric impulse signal, the number of turns conversion that rotating shaft turns over according to hoisting drum goes out the pulse count of a great deal of, through photoisolator (2), actuator (74LS244), clutter in the erasure signal, and microcomputer minimum system (4) is delivered in shaping then, in order just to discern, despining, adopted the reflection that links to each other with crane hoisting reel motor control loop its just, relay contact switch (3) signal of counter-rotating is also through photoisolator (2), actuator (74LS244), input microcomputer minimum system (4).

User program is solidificated in the program register (2732) of microcomputer minimum system (4), when the crane hook lifting altitude is read in the user program appointment, pin 27 A wires of microcomputer minimum system (4) single chip microcomputer (80C31), pin 17 sense wires output high level signal, line drive (74LS244) work, the electric impulse signal that photoelectric sensor (1) comes, reflect that promptly number of turns conversion that the hoisting drum rotating shaft turns over goes out the pulse count input microcomputer minimum system (4) of a great deal of, carry out computing, can being set in of computing: the hoisting drum rotating shaft position when load hook just contacts with the quay surface with reference to zero-bit, result of calculation outputs to sound, light, display circuit (6), the ground-surface lifting altitude of load hook slipping from alongside of numeric display lifting mechanism, when lifting altitude meets or exceeds the highest or minimum setting value, corresponding alarm lamp is bright, and cut off this power source of hoisting automatically, sound a buzzer simultaneously and ring alerting signal, telltale shows the warning lifting altitude value of this lifting mechanism.

The utility model can other be protected the use of alarm device integrator safely with hoisting crane, as crane load, and crane boom frame work range, wind speed warning device.Be provided with signal recognition circuit (5) for ease of discerning various signals, by microcomputer minimum system (4) single chip microcomputer pin 10,11 output signals are through phase inverter (74LS04), actuator (74LS241), phase inverter (74LS04) is to the output signal shaping, deliver to the parallel output register (74LS164) of serial shift, when pressing touch-key selection demonstration, (74LS08) closes DDC with door, key signals enters single chip microcomputer (80C31) microcomputer minimum system (4) through (74LS164), retrieve by microcomputer, and carry out corresponding key function program, as the crane hook lifting altitude, be finished, (74LS08) opens with door, recover DDC, and finish corresponding demonstration, sound, the light warning function.

In microcomputer minimum system (4) when work, monitor the operation of microcomputer by monitoring device, in case when power interruption or power supply et out of order, monitoring device sends the interrupt run programmed instruction, and keeps legacy data, works on during power up.

The utility model compared with prior art can monitor at any time and show that crane hook hoists The situation of change of height, intuitive and reliable, in case when occurring surpassing preset value, immediately output is protected Protect control signal, in case have an accident, and it is solid to set user program according to different crane models Change in order to adapt to various operating mode, has stronger applicability in minimum microsystem.

Claims (1)

1. a crane hook lifting altitude indication annunciator has the plunging joint that links to each other with the rotating shaft of crane hoisting reel, it is characterized in that also having: the photoelectricity tachometer generator (1) that fuses with plunging joint, photoisolator (2), crane hoisting motor relay contact switch (3), actuator (74LS244), or door (74LS32), single chip microcomputer (80C31) chip, program register (2732), address latch (74LS373), the microcomputer minimum system (4) that monitoring device is formed, signal recognition circuit (5), sound, light, Display and Alarm Circuit (6); Wherein:

During hoisting drum rotating shaft rotation, corner displacement is changed into electric impulse signal by photoelectric sensor (1), through photoisolator (2), actuator (74LS244), the input microcomputer chases after minimum system (4);

Relay contact switch (3) signal of its forward and backward of reflection that links to each other with hoisting drum lifting motor control loop is also through photoisolator (2), and actuator (74LS244) is imported microcomputer minimum system (4);

Or door (74LS32) pin 1,19 that connects 27,17 pin of single chip microcomputer (80C31) of microcomputer minimum system (4) and actuator (74LS244) constitutes and drives gating signals;

Phase inverter (74LS04), actuator (241), phase inverter (74LS04), form signal recognition circuit (5), connect single chip microcomputer (80C31) the chip pin 10,11 of microcomputer minimum system with door (74LS08), the parallel Output Shift Register (74LS164) of serial, touch formula button;

Sound, light.Display and Alarm Circuit (6) connects single chip microcomputer (80C31) the chip delivery port of microcomputer minimum system (4).