KR19990030365U - Safe Area Detection Device of Telescopic Handler - Google Patents

Abstract

Detects the pressure value of the lifting load applied to the outrigger of the telescopic handler and displays a warning when the detected pressure value reaches a preset threshold, thereby providing a safe area when the telescopic handler is working. A safety zone detection device for a telescopic handler that prevents deviations. A pressure sensor is mounted on the pivot pins of the telescopic boom and the boom cylinders and on each of the outriggers to distribute the pressure to the lifting load of the workpiece. And the pressure on the strength (conduction) of the telescopic handler, that is, the pressure applied to the plurality of outriggers, respectively, respectively, and the detected load and pressure values are compared with the preset reference thresholds. When the threshold value is reached, the warning part is driven according to the logical operation of the logic circuit part. It warns that the situation is outside the safety zone.

Description

Safe Area Detection Device of Telescopic Handler

The present invention relates to a telescopic handler, and in particular, by detecting each of the lifting load pressures applied to the outrigger of the telescopic handler and displaying a warning when the detected pressure value reaches a preset threshold. In addition, the present invention relates to a safety zone sensing device of a telescopic handler that prevents the safety of the telescopic handler from moving out of the safety zone.

In general, telescopic handlers are industrial vehicles that are used in a wide range of construction sites such as buildings, private buildings, and factory constructions as well as industrial construction with various functions and performances. Such industrial vehicles include forklifts, crane heavy-duty vehicles, and telescopic handlers as described above.

Here, the forklift is used to load the work used in the construction site or industrial site on the vehicle or the work in the vehicle to use the white work, which is to move the work to a high place such as building or apartment building It is a vehicle used to move a workpiece by simply moving it horizontally.

However, telescopic handlers are used in construction sites such as buildings and apartments, and can be used to lift and move structures or works in the workplace to high places, or to lift the structures or works from higher places to the workplace. It is a vehicle used when. Therefore, the scope of work is very extensive.

A telescopic handler applied to the present invention among such industrial vehicles will be described with reference to FIG. 1.

1 is a perspective view illustrating a structure of a general telescopic handler. Referring to FIG. 1, a simple structure of the telescopic handler may include a lower driving body 11 configured to have four wheels, such as a general vehicle, for moving or driving a distance of a vehicle. And, the upper swing structure 12 configured to rotate 360 ° so that the driver can ride and adjust the movement or lifting and lifting of the workpiece and adjust the steering of the vehicle, and for lifting or lifting and moving the workpiece. Telescopic boom 14, the length of which is adjusted like a general telescope, a fork 16 installed at the end of the telescopic boom 14 for transporting a work, and a shank east of the telescopic boom 14 The boom cylinder 13 for adjusting the angle, the fork cylinder 15 for adjusting the vertical angle of the fork 16, and the telescopic handle when lifting or lifting the work. It is provided with a plurality of outriggers 17 for supporting the vehicle on the floor to prevent the movement of the rudder 10 and to prevent the vehicle from falling by the load of the workpiece when lifting or lifting a heavy load. . Here, the upper swing structure 12 includes an operating lever, a steering device, and a plurality of devices that allow the driver to perform all operations of the telescopic handler 10, and that is, the bottom of the upper swing structure 12, that is, the lower portion of the upper swing structure 12. The part which abuts with the drive body 11 is provided with the rotating shaft which the upper revolving body 12 can rotate 360 degrees. As the means for transporting the workpiece, a plurality of moving means may be detachably used in addition to the fork 16.

In addition, the plurality of outriggers 17 are configured in four directions in all directions and the width and length of the outriggers 17 can be adjusted by the operation of the driver's operation lever.

The operation of the general telescopic handler 10 configured as described above will be briefly described.

First, when the worker wants to move the work in the workplace to a certain height, first, the work to be lifted is loaded by using the transport means attached to the end of the fork 16 or the telescopic boom 14. Or bet. At this time, the carriage cylinder 15 is adjusted to easily load the workpiece as much as possible to maintain the angle of the fork 16 in an optimal state.

And, to move the work loaded on the fork 16 to the desired position by turning the upper swing body 12 to the desired place using one operation lever, the desired place using the telescopic boom 14 operation lever. Adjust telescopic boom 14 by the length to. If the desired location is a high position, by adjusting the boom cylinder 13 using the lift cylinder 13 operating lever to adjust the vertical angle, it is to move the workpiece to the desired place.

On the other hand, the vehicle can be moved by the rotation of the upper swing body 12 or the load of the workpiece or the vehicle can be generated, which is to adjust the outrigger 17 mounted on both sides of the four wheels to It is to be supported on the floor to prevent movement. Therefore, all work can be carried out smoothly and easily. Here, the adjustment of the outrigger 17 is to drive in advance before all work starts.

Hereinafter, the operation of the outrigger 17 will be described in detail with reference to the hydraulic circuit diagram of the outrigger shown in FIG. 2.

2 is a diagram illustrating an outrigger hydraulic circuit diagram of a telescopic handler according to the related art.

First, when the operator selects the operating lever from the neutral state to the driving position (falling position) for driving the outrigger 17, that is, to lower the outrigger 17, the first solenoid is driven by the driving signal of the operating lever. 30a is driven, and the control valve 30 moves to the right in accordance with the driving of the first solenoid 30a. Accordingly, the oil supplied from the oil tank 28 according to the driving of the pump 29 supplies the oil into the respective outrigger cylinders 24, 25, 26, 27 through the hydraulic pipe 32.

Then, the oil existing under the piston in the cylinders 24, 25, 26, 27 is returned to the oil tank 28 through the hydraulic pipe 31, whereby the piston in the cylinder is moved by the hydraulic pressure downwards to the outrigger cylinder (20, 21, 22, 23) will work uniformly.

Subsequently, a certain amount of hydraulic pressure is formed in each of the outrigger cylinders 24, 25, 26, 27 so that the telescopic handler 10 is fully supported on the floor, and the operator switches the operation lever back to the neutral position. Therefore, the operation of the solenoid 30a is cut off, and the control valve 30 is returned to its original position to shut off the oil supplied from the oil tank 28 to the cylinders 24, 25, 26, 27 through the hydraulic pipe 32. Will be done. Thus, each outrigger cylinder 24, 25, 26, 27 is to be maintained at the current hydraulic pressure.

In this way, when the operator selects the operation lever to the raised position to drive the outrigger cylinders 24, 25, 26, 27 to end the work of the telescopic handler 10 and to raise the outrigger 17 to its original position, the control valve The solenoid 30b attached to the 30 is driven to move the control valve 30 to the left. Therefore, the oil supplied from the oil tank 28 in accordance with the driving of the pump 29 is supplied to the lower portion of each cylinder 24, 25, 26, 27 through the supply pipe 24, the respective outrigger cylinder 24, The piston in 25, 26, 27 is moved upward. At this time, the oil existing on the piston is returned to the oil tank 28 through the hydraulic pipe (32).

In this way, when each outrigger 17 is raised, the operator selects the operation lever to its original position, that is, the neutral state, and stops the supply and return of oil to complete the operation of the outrigger cylinders 24, 25, 26, 27. It is.

However, when the conventional telescopic handler is operated, the safety zone can be detected only by the user's sensitivity and judgment, so that the accurate safety zone cannot be detected, which may cause a serious accident in safety.

Accordingly, the present invention has been made to solve the above problems according to the prior art, the object of the present invention is to detect the deformation direction by stress in the main part of the equipment to detect the design strength and conduction risk of the equipment during operation of the telescopic handler In comparison, the present invention provides a safety zone detection device of a telescopic handler that warns of an overload detection and performs a safe operation.

1 is a perspective view showing the structure of a general telescopic handler

2 is a hydraulic circuit diagram for driving an outrigger of a typical telescopic handler.

3 is a block diagram showing a safety zone sensing device of a telescopic handler according to the present invention;

♣ Explanation of symbols for main part of drawing ♣

20, 21, 22, 23, 33: pressure sensing unit 24, 25, 26, 27: outrigger cylinder

28: oil tank 29: pump

30: control valve 31, 32: hydraulic pipe

34, 35: first and second comparison unit 36: or gate

37: warning unit

Features of the safety zone detection device of the telescopic handler according to the present invention for achieving the above object is a first detection unit mounted to the telescopic boom and the pivot pin (Pivot Pin) of the boom cylinder for sensing the load of the workpiece; A plurality of second sensing units mounted on each of the outriggers and respectively sensing pressures applied to the outriggers; First and second comparison units configured to compare the load and pressure values detected by the first and second detectors with a preset reference threshold and output a corresponding signal when the detected value reaches a preset reference threshold; A logic circuit unit for performing a logic operation on the signals output from the first and second comparison units, respectively; According to the signal output from the logic circuit portion is configured to include a warning unit for warning the worker of a dangerous situation outside the safety area.

In addition, another feature of the present invention is that the first and second sensing units are made of a strain gauge.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the safety zone detection device of the telescopic handler according to the present invention will be described.

3 is a view illustrating a safety zone detecting device of a telescopic handler according to the present invention, and referring to FIG. 3, the pivot pins of the telescopic boom 14 and the boom cylinder 13 are illustrated in FIG. 1. A second pressure sensor 33 mounted on a pivot pin to sense a pressure of the work, that is, a load distribution, and a second sensor mounted on a lower end of each of the outriggers 17 to sense pressure applied to the outriggers, respectively. , 3, 4, 5 pressure detection unit (20, 21, 22, 23) and the pressure value detected by the first pressure detection unit 33 is compared with a predetermined reference threshold value corresponding signal according to the comparison result The first comparator 34 outputs and the pressure values sensed by the plurality of pressure detectors 20, 21, 22, and 23, respectively, are compared with a preset reference threshold value, and output a corresponding signal according to a comparison result. The warning unit 3 according to the output signal of the second comparison unit 35 and the first and second comparison units 34 and 35. It consists of an orifice 36 to give a warning indication to 7). Here, the first pressure sensing unit 33 and the plurality of pressure sensing units 20, 21, 22, and 23 are made of a strain gauge.

The operation of the safety zone sensing device of the telescopic handler according to the present invention having the configuration as described above will be described.

First, in order to detect a load moment value, a pressure sensing unit 33, that is, a strain gauge is mounted on a pivot pin connecting the telescopic boom 14 and the boom cylinder 13 shown in FIG. 1, In order to detect the conduction of the vehicle, pressure sensing units 20, 21, 22, and 23, that is, strain gauges, are mounted on the lower outriggers 17 of the telescopic handler 10, respectively.

Subsequently, the driving range of the plurality of pressure sensing units 20, 21, 22, and 23, that is, the strain gauges, is set through load lifting experiments according to conditions of a load chart. Here, the load chart is set by considering that the maximum lifting load in the state in which the outrigger 17 is fully extended (to secure the supporting surface of the square) is the same in the turning work area, that is, within 360 °.

Although the output value of the constant strain gauges 20, 21, 22, and 23 is not necessarily given according to the boundary value on the load chart, the strain gauges 20, 21 are provided for the safety region for the strength of the load and the safety region for conduction. , 22, 23) can be determined by experiment.

As such, the strain gauges 20 and 21 appear in various ways depending on the load of the work being lifted during operation of the telescopic handler 10, that is, the boom angle, the length of the boom, and the like. , 22, 23, 33 are continuously compared with the reference threshold values preset in the first and second comparison units 34 and 35.

As a result of comparison, when the values detected and output by the strain gauges 20, 21, 22, 23, 24, and 33 reach the first, second and reference thresholds preset in the comparison units 34 and 35, it is dangerous. The signal output from the first and second comparators 34 and 35 determined as a state is output to the warning unit 37 through the orifice 36. Therefore, the warning lamp or the buzzer of the warning unit 37 is operated.

That is, when the lifting load value detected as a result of the comparison by the first comparator 34 reaches the preset reference threshold value, the orifice 36 moves the warning part 37 regardless of the output signal of the second comparator 35. Drive according to the logic operation output signal of the control panel, or when the overturning pressure signal is applied from the second comparator 35, that is, the plurality of pressure sensing units 20, 21, 22, and 23 are detected. If the minimum pressure value, which may be a risk of falling of the telescopic handler 10, is detected even in one pressure sensing unit 20, 21, 22, 23, the warning unit 37 may be connected to the orifice 36. ) Will be driven. As a result, when any one of the outputs of the first and second comparators 34 and 35 is a high value (that is, the detected load value reaches a predetermined threshold value or one of the plurality of detected outrigger pressures is increased). When the reference pressure is less than or equal to the preset reference pressure, the or gate 36 outputs a high signal to drive the warning unit 37.

As a result, the present invention provides a pivot pin connecting the telescopic boom 14 and the boom cylinder 13 to detect a load moment value, and a bottom out of the telescopic handler 10 to detect conduction of the vehicle. When the strain gauges 20, 21, 22, 23, 33 are attached to each of the triggers 17, respectively, when the load value of the salvage detected by the strain gauge 33 reaches a predetermined reference threshold, that is, overload , The pressure value of the outrigger 17 sensed by the strain gauges 20, 21, 22, and 23 is a predetermined reference pressure value, that is, a minimum pressure value at which conduction can occur. When detected, it is determined that the fall is a dangerous or dangerous situation and alerts the worker.

As described above, the apparatus for detecting a safety zone of a telescopic handler according to the present invention includes a pivot pin connecting a telescopic boom and a boom cylinder to detect a load moment value, and a telescopic handler of a telescopic handler to detect conduction of a vehicle. Strain gauges are attached to each of the lower outriggers, and when the load value of the salvage detected by each strain gauge reaches a preset threshold value, that is, when an overload is applied, it is determined that it is a dangerous situation and alerts the worker. By doing so, it is possible to secure a safe and efficient working area in consideration of the strength and conduction of the equipment.

Claims (3)

In a telescopic handler with a telescopic boom, a boom cylinder, a pivot pin and a plurality of outriggers, A first detector mounted on a pivot pin of the telescopic boom and the boom cylinder to sense a load of a lifting object; A plurality of second sensing units mounted on each of the outriggers and respectively sensing pressures applied to the plurality of outriggers; First and second comparators for comparing the pressure values sensed by the first and second detectors with preset reference thresholds, respectively, and outputting corresponding signals according to a comparison result; A logic circuit unit for performing a logic operation on the signals output from the first and second comparison units, respectively; And a warning unit configured to be driven according to a signal output from the logic circuit unit to warn a worker of a dangerous situation outside of the safe area. The apparatus of claim 1, wherein the first and second detectors comprise a strain gauge. According to claim 1, If the lifting load sensed as a result of the comparison in the first comparison unit reaches a predetermined reference threshold value, the warning unit is driven regardless of the output signal of the second comparison unit, the comparison result in the second comparison unit The warning unit may be driven regardless of the output of the first comparator when at least one of the pressure values sensed by the plurality of second sensing units exists that may cause a risk of falling of the telescopic handler. Safe Area Sensing Device for Telescopic Handler.