CN1537802A

CN1537802A - Multiangle distance limiter of crane

Info

Publication number: CN1537802A
Application number: CNA031227120A
Authority: CN
Inventors: 刘洪军
Original assignee: Shanghai Baoshan No13 Metallugical Building Co Ltd
Current assignee: Shanghai Baoshan No13 Metallugical Building Co Ltd
Priority date: 2003-04-17
Filing date: 2003-04-17
Publication date: 2004-10-20

Abstract

A multi-angle distance limiter for crane is disclosed, which is arranged in the cab of crane. The various critical values can be set up by operator via its man-machine interactive monitor. After they are processed and compared by CPU, relative result is output to limit the critical values of moving distance and hoisted weight.

Description

Hoisting crane multi-angle distance limit device

Technical field: this product is placed on operator's compartment, and the operative employee is according to the man-machine dialog interface monitoring equipment, according to site operation situation and status of equipment, set each critical value of weight-lifting equipment, calculate and handle through CPU, compare, make corresponding output with detecting the loop.

Background technology: China's weight-lifting equipment (gauntry crane, driving, ship unloaders etc.) adopts cam controller to the equipment direct control substantially, and equipment running status does not have the detection loop, and the protection loop is also very simple.Though the direct price of operation simple in structure is cheap, stay a lot of technical protection problems, all to note and find also being handled by the operative employee, increased the weight of operative employee's labour intensity and technical requirements ability like this.When the operative employee operates not in placely at work, when attention is concentrated inadequately, hear big dolly collision block sound through regular meeting, mainly pay a hook steel rope to take off groove impaired, serious cause big dolly to plunge off the tracks to collapse wire cable rupture hook great serious accident such as fall.

Summary of the invention: hoisting crane distance limit device is to solve miles of relative movement critical value and the killer that plays the liter weight critical value.Aspect distance, it relies on detects the loop impulse singla, converts digital signal to through electronic circuit and flows to CPU, multiplies each other in the inner basic value of setting with display panel of CPU, and the value that draws is transported to display panels, is beneficial to operative employee's monitoring equipment.The value that draws simultaneously and the critical value of setting compare, condition is satisfied to be continued to compare, and condition is satisfied to add that the positive and negative CRANK PULSES of collection also satisfies condition, and just exports restriction signal, the resistance that serially adds through intermediate relay drive motor rotor increases, and slows down thereby reach motor.Remain in operation,, just export ct-off signal, disconnect through intermediate relay driving power contactless switch, thereby realize that motor shuts down when the value that draws has also satisfied the boundary value of setting.Aspect a liter weight, it relies on pizo-resistance or pressure-sensitive capacitance to change the resistor current signal, convert digital signal to through electronic circuit and flow to CPU, delivering to display panels through CPU internal arithmetic result compares with setting value simultaneously, play liter weight again in 50% allowed band, but the indefinite running.Surpass 50% allowed band when playing liter weight, just output limits signal, slows down the time response of operation, just can reach smooth starting and stop.Just export ct-off signal when a liter weight reaches setting weight, disconnect, thereby realize that motor shuts down through intermediate relay driving power contactless switch.In order to reduce accumulated error, all set adjusting point in each angle.When the speed of moving is less than or equal to setting value, add that the adjusting point condition satisfies, current operation address just becomes modified address.Adopted this technology, the expense of cost is very low, has not only alleviated operative employee's labour intensity, increased the R point of operation scheme, strengthen device ' again, also utilized equipment performance to finish every construction task to greatest extent, strengthened the equipment utilization rule.

The specific embodiment: 8421 yards incremental encoders can be adopted in the distance detecting loop, are installed on the wheel, remove the physical displacement amount according to the digital quantity in the unit time, and the displacement that can get individual digit is as base value.Digital quantity is taken advantage of base value to add or is deducted correction and just equals amount of logic.The value of adjusting point can adopt near the switch acquired signal, and positive and negative CRANK PULSES adopts the positive inverted signal of operating handle.The electric current changing value of pressure-sensitive capacitance or pizo-resistance is adopted in the weight detecting loop, the current value of no-load condition is converted to digital quantity as a reference value through A/D, the article gained digital quantity that hangs std wt is deducted the weight of unloaded digital quantity divided by the standard article, draw the digital quantity of unit weight.The weight of display panel is exactly the physical quantity of article.

Claims

1. hoisting crane multi-angle distance limit device is characterized in that changing through A/D; the pulsed quantity of gathering is changed into digital quantity compare with setting value, participate in control and safety guard-safeguard directly, be presented at control panel through CPU calculating; be beneficial to operative employee's monitoring equipment running state, in time adjust operation scheme.