KR100264477B1 - Outrigger autolevelling system - Google Patents

Abstract

PURPOSE: An auto leveling device for an outrigger is provided to automatically control a hydraulic circuit for raising a hydraulic jack of outrigger at a relatively low position by a horizontal detection instrument. CONSTITUTION: Respective hydraulic cylinders(7,8,9,10) are provided in hydraulic jacks(4,4'5,5') and for controlling the supply of pressure oil to the hydraulic cylinders, directional control valves(11,12,13,14) are prepared. When the hydraulic jacks touch a ground, pressure of an upper chamber(18) rises up and a pressure switch(24) is operated for the controller to decide the hydraulic jack being touched with the ground. Thereafter, height of the four outriggers is adjusted precisely to be horizontal to make a vehicle horizontal. Through a directional control valve(26) of a passageway(35) from a pressure oil supply source(34), pressure oil is uniformly supplied and connected to nozzle tubes(36) communicated with each nozzle. While oil is being injected from four nozzles(30,31,32,33), under a vehicle horizontal, a valve spool of directional control valves(45,46) is stopped at a first position(47), yet in other case, the valve spool contacts with an entrance of the nozzle.

Description

Outrigger auto leveling device

The present invention relates to an auto-leveling device for automatically placing the outrigger horizontally for horizontal support of a special vehicle such as a boom and ladder fire truck, crane, in particular by automatically opening and closing the direction control valve by the horizontal detection means of the vehicle body The present invention relates to an autoleveling device that automatically adjusts the height of a trigger hydraulic jack to level an outrigger.

For example, in the case of boom and ladder fire trucks, it is necessary to extend the folded ladder to extinguish high-level fires or to rescue people and work at high altitudes. Since the work is carried out, the center of gravity of the sum of the weight of the ladder itself and the weight of the worker and the equipment is eccentric from the center of gravity of the body, so there is a risk of the vehicle overturning due to the rotation moment. Typically, four outriggers 1 and 2 are provided on the side of the vehicle body 3 as shown in FIG. 1, and each outrigger 1 and 2 is provided with a hydraulic jack 4, which is operated by hydraulic pressure. 5) is provided to ensure the safety of the fire truck by supporting the body in four horizontal positions with respect to the ground.

For the horizontal arrangement of such outriggers (1,2), conventionally, each outrigger (1,2) is stretched and hydraulic jacks (4,5) are lowered therefrom and fixed to the ground, where the ground is uneven or inclined. Adjust the lowering distance of the hydraulic jack from each outrigger so that the outrigger is horizontal. The height adjustment of the hydraulic jack has been made to level the outrigger with the naked eye by using a level gauge provided to the outrigger or by operator experience. The level meter has a problem that it takes a lot of time to the horizontal arrangement of the outrigger as the operator checks whether the bubble is formed in the water is located in the center to adjust the outrigger to be horizontal, the horizontal by visual inspection of the operator It is not only time-consuming but also inaccurate to meet the risk of safety accidents.

Conventionally, in order to solve this problem, a leveling device has been proposed, which uses a potentiometer to raise and lower the hydraulic jack cylinders by driving a servovalve through a controller with respect to a potential difference caused by position displacement. However, such a device is very expensive. Therefore, there was a burden due to the increase in manufacturing cost, there was a problem that a malfunction occurred due to a trouble in the electric device, and there was a problem that can not be easily repaired in the field in case of failure.

The present invention can solve the excessive consumption and inaccuracy of the manual operation time according to the conventional outrigger horizontal arrangement, solve the problems caused by the conventional electrical control device, and can quickly and accurately perform the horizontal arrangement of the outrigger, It is aimed at providing easy to maintain and low cost outrigger auto leveling device.

It is also an object of the present invention to provide an outrigger autoleveling device for automatically controlling a hydraulic circuit to raise an outrigger hydraulic jack at a relatively low position by a horizontal detection means for detecting whether the vehicle body is horizontal.

1 is a perspective view of a state of use of a boom and ladder fire truck provided with an outrigger.

2 is a hydraulic circuit diagram for operating and autoleveling an outrigger in accordance with the present invention.

3 is a schematic side cross-sectional view of the horizontal detection means of the outrigger of FIG.

In order to achieve the above object, the outrigger autoleveling apparatus according to the present invention includes horizontal detection means for detecting the horizontality of four outriggers arranged laterally on the vehicle body, and among the outriggers in response to the horizontal detection means. And control means for controlling the hydraulic oil flow to the hydraulic cylinder for the hydraulic jack to adjust the hydraulic jack height of the relatively low outrigger.

The horizontal detecting means is provided with an equilibrium weight in the hollow space formed in the body of the cube, and the hydraulic oil nozzles corresponding to the four hydraulic jacks are provided on the side wall of the hollow space toward the center of the counterweight. The discharge port is formed to discharge, the counterweight is spaced by a predetermined interval relative to the horizontal when the vehicle body is horizontally disposed close to the nozzle inlet, the nozzle is inclined by the inclination of the vehicle body when injecting oil toward the counterweight In the case of the nozzle in which the counterweight is in contact with the oil counterpart, the oil pressure is supplied to the hydraulic cylinder of the hydraulic jack by the control means in response to the increased pressure inside the oil jack, and the height of the hydraulic jack is raised to level the outrigger. It is configured to.

The control means divides outriggers in the diagonal direction among the outriggers into the same pair, and controls the hydraulic oil flow to the hydraulic cylinder of the hydraulic jacks provided to each of the outriggers of each pair in response to the horizontal detection means so that the outriggers of the pair are horizontally A direction control valve is provided, one in each tank to control the supply of hydraulic oil to each of the hydraulic cylinders, each of the direction control valves are the pressure of the nozzle corresponding to each outrigger in the horizontal state of the vehicle body When the same, the port is closed in the first position so that the oil pressure is not supplied to the hydraulic cylinder of the outrigger hydraulic jack of the pair, and the second to allow the hydraulic oil supply to the hydraulic cylinder of the lower cylinder to lift the hydraulic jack of the relatively low position. It is controlled between the position and the third position.

Hereinafter, with reference to the drawings showing an embodiment of the outrigger auto-leveling device according to the present invention will be described in more detail.

1 and 2, in the case of a boom and a ladder fire truck, the fire is generated on the vehicle body 3 by the weight of the boom and the ladder 6 and the weight of the worker and the equipment, as the ladder is laid out during the fire work. In order to support the rotation moment, two pairs of two outboards (1) and (2) are provided on both sides of the vehicle body, and the respective hydraulic jacks (4, 4 ') (5, 5') are lowered therefrom to the vehicle body relative to the ground. To support it. At this time, the height of the four hydraulic jacks should be adjusted to support the vehicle body horizontally. For this purpose, the hydraulic jacks in the diagonal direction are bundled onto the hydraulic circuit and divided into two sets of hydraulic jacks (4, 5 ') (5, 4'). The outriggers are placed horizontally by supplying and lifting pressure oil from the two hydraulic jacks of each set to the cylinders of the lower hydraulic jacks 4 or 5 'and 5 or 4'.

In Fig. 2, the hydraulic jacks 4, 4 ', 5 and 5' are provided with hydraulic cylinders 7, 8, 9 and 10, respectively, and the hydraulic oil supply to each hydraulic cylinder is controlled. To this end, direction control valves 11, 12, 13, 14 are provided which are controlled manually or by a controller not shown in the figures. When installing the hydraulic jacks on the ground, the operator controls the directional control valves 11, 12, 13, and 14 by manual operation or by the controller to close the port communicating with the hydraulic oil supply source, and the upper and lower chambers 18 19, the hydraulic oil from the hydraulic oil supply source is supplied to the upper chamber 18 of the cylinder at an initial first position 15 with the plunger 20 stopped while the check valve is provided between the ports. In addition, the oil is discharged from the lower chamber 19 into the tank to the second position 16 so that the plunger 20 of the hydraulic jack quickly descends to the ground. The third position 17 is for supplying the pressurized oil from the upper chamber 18 while supplying the pressurized oil to the lower chamber 19 to lift the plunger of the hydraulic jack. Pilot operation check valves 23 (for the hydraulic channels 11 and 12 connected to the upper chamber 18 and the lower chamber 19 of the hydraulic jacks 11, 12, 13, and 14, respectively) 24 are provided, and when the hydraulic jack is lifted, that is, when the hydraulic oil is supplied through the flow path 21 when the plunger 20 is discharged from the cylinder, the check valve 24 is opened by increasing the pilot pressure as the pressure is increased. While the oil in the lower chamber 19 can be discharged, it is increased as the hydraulic oil is supplied to the lower chamber 19 through the flow passage 22 when the hydraulic jack is lowered, that is, when the plunger 20 is returned into the cylinder. The pilot pressure is increased by the pressure to open the check valve 23 of the flow path 21 so that oil is discharged from the upper chamber 18 through the flow path 21.

When the hydraulic jacks touch the ground, the pressure in the upper chamber 18 rises, so the pressure switch 24 operates accordingly to determine that the hydraulic jack touches the ground. The outrigger autoleveling device of the present invention then precisely adjusts the height of the four outriggers to be horizontal with the plungers of the hydraulic jacks positioned on the ground so that the vehicle body is leveled.

The outrigger autoleveling device of the present invention is confirmed by the controller that the plungers have touched the ground from operation with the pressure switches 24 provided on the four hydraulic jacks 11, 12, 13, 14; Next, the direction control valve 26 is switched to the position at which the flow path is opened so that the hydraulic oil is supplied to the horizontal detection means 25 by the signal from the controller to start the leveling process of the outrigger.

The horizontal detecting means 25 has a hollow space portion 28 is formed in the body 27, as shown in the cross-sectional view in Figure 3 therein is provided with an annular counterweight 29, empty space portion 28 The hydraulic oil nozzles 30, 31, 32, 33 are provided in correspondence with the four hydraulic jacks so as to face the center of the counterweight on the side wall. At this time, the counterweight 29 is disposed close to the four nozzles at a predetermined interval based on when the vehicle body is horizontal.

For example, 20 bar of pressurized oil is uniformly supplied from the pressurized oil source 34 through the directional control valve 26 of the oil passage 35 and communicated with the respective nozzles from the oil passage 35. Are connected. Branch pipes 37, 38, 39 and 40 are branched from each nozzle pipe 36, and the two opposed nozzle pipes 37 and 38 are two pairs of hydraulic jacks 4 and 5 'in a diagonal direction. Connected to the directional control valve 45 connected to the hydraulic cylinders 7, 8, 9, 10 through the flow passages 41, 42, 43, 44, and the other two nozzle branches 39, 40 are also provided. It is connected to the other two hydraulic jacks 5, 4 'height control valve 46 through the flow path (43, 44). The directional control valves 45 and 46 are three-way valves which are controlled by moving the valve spool according to the pressure change of the branch pipe, and the first position 47 in which all ports are closed, and the oil pressure from the pressure oil supply source are relative. To the upper chamber 18 of the hydraulic cylinder 7 of the hydraulic jack 4, for example, while the oil is discharged from the lower chamber 19 while the other The second position 48 to prevent the hydraulic oil from being supplied to the hydraulic cylinder 8 of the hydraulic jack 5 ', and the upper chamber of the hydraulic cylinder 8 when the position of the other hydraulic jack 5' is relatively low ( 18, the oil is supplied from the lower chamber 19 and the oil is discharged from the lower chamber 19, while the oil is supplied to the hydraulic cylinder 7 of the hydraulic jack 4. The directional control valves 45 and 46 are each provided with springs at both sides so that the valve spool is always in the center, that is, in the first position 47.

Each nozzle tube 36 is provided with three orifices to control the oil flow rate to adjust the pressure. That is, the valve spools of the directional control valves 45 and 46 by causing the flow rate to be increased relatively immediately in front of the nozzle to make the pressure in the nozzle branch pipes 37, 38, 39 and 40 relatively lower than the other parts. Even with this small pressure change, that is, the amount of counterweight 29 approaching the nozzle inlet impedes the injection of oil from the nozzle and is sensitively moved by the increased pressure in the nozzle tube, causing the valve to switch position. .

When oil is injected from the four nozzles 30, 31, 32 and 33, when the vehicle body is horizontal, the pressures of the nozzle branch pipes 36 on the opposite side are the same, so that the direction control valves 45 and 46 The valve spool remains stationary in the first position 47, but when the vehicle body is not level, it comes into contact with the inlet of the nozzle corresponding to the hydraulic jack in the relatively low position. For example, when the hydraulic jack 4 has a lower position than the other hydraulic jacks 5 'in the diagonal direction, the counterweight 29 is closer to the inlet of the nozzle 31 so that the oil jet from the nozzle 31 can be discharged. Is impeded so that the pressure in the nozzle tube and its branch pipe 38 becomes greater than in the branch pipe 37, causing the valve spool of the directional control valve 45 to move, thereby moving from the first position 47 to the second position 48. Is switched to. Accordingly, the pressure oil from the pressure oil supply source is supplied to the upper chamber 18 of the hydraulic jack 4 and the oil of the lower chamber 19 is discharged. To this end, the check valves 23 and 24 are pilot operated check valves, and as the pressure in the flow passage 41 is increased, the pilot pressure is increased, so that the check valve 24 is opened and oil in the lower chamber 19 can be discharged. have. Accordingly, the plunger 20 is advanced from the hydraulic jack 4 to raise the height, while the flow passage 42 to the other hydraulic jack 5 'having a relatively high position is connected to the drain port but is connected to the check valve 50. As the flow path is blocked, the oil in the upper chamber 19 is not discharged and the plunger 20 of the hydraulic jack 5 'is kept in a stopped state. The lifting and lowering of the hydraulic jack 4 is until it is horizontal with the other hydraulic jacks 5 'in the diagonal direction, and when the horizontal is made, the distance between the counterweight 29 and the nozzles 30 and 31 is the same. Since the pressure in the tubes is also the same, the direction control valve 45 is returned to the initial first position 47 so that the hydraulic jacks 4 and 5 'keep the outrigger in a horizontal state.

The horizontal adjustment of the hydraulic jacks 5 and 4 'in the other diagonal direction is relatively performed among the nozzle tubes due to the inclination of the counterweight 29, as described with respect to the horizontal adjustment in the hydraulic jacks 4 and 5'. As the above-mentioned direction control valve is controlled by the pressure increase of the nozzle tube corresponding to the hydraulic jack in the low position, the pressurized oil is supplied to the hydraulic cylinder of the hydraulic jack in the relatively low position and lifted, while the hydraulic jack in the relatively high position is stopped. To keep it horizontal.

As described above, when the two hydraulic jacks in the horizontal direction are adjusted to the horizontal state, the vehicle body becomes horizontal, so that the vehicle body horizontal level sensor, which is provided to the vehicle body, detects the level of the vehicle body and a signal for the signal from the controller. Subsequently, the hydraulic cylinder of the boom is subsequently operated to control the operation of the folded ladder.

According to the present invention, the horizontal state of the outriggers can be accurately detected by the horizontal detection means, and the hydraulic pressure flow to the outrigger hydraulic jack is controlled in response to the horizontal detection means to raise the outrigger hydraulic jack at a relatively low position and the other outriggers. By precisely adjusting the same height automatically, the outrigger leveling is very simpler, faster and more precisely compared to the conventional worker leveling the outriggers by hand, so that the vehicle body can be stably supported.

Claims (4)

Horizontal detection means for detecting the horizontality of the four outriggers extending laterally from the vehicle body, and in response to the horizontal detection means to the hydraulic jack hydraulic cylinder for adjusting the height of the hydraulic jack of the relatively low outrigger of the outriggers An outrigger autoleveling device comprising control means for controlling the hydraulic oil flow. The pressure detecting nozzle of claim 1, wherein the horizontal detecting means is provided with a counterweight in an empty space formed in the body and provided with four hydraulic jacks corresponding to four hydraulic jacks on the side wall of the empty space toward the center of the counterweight. The discharge port is formed to discharge the oil to be injected, the counterweight is spaced at a predetermined interval based on the horizontal when the vehicle body is positioned close to the nozzle inlet, when the nozzles inject the oil toward the counterweight of the vehicle body In the case of the nozzle in contact with the counterweight inclined by the inclination, the oil pressure is supplied to the hydraulic cylinder of the hydraulic jack by the control means in response to the increased pressure inside the oil spray, thereby elevating the height of the hydraulic jack and raising the outrigger. Outrigger autoleveling device, characterized in that configured to align horizontally. The hydraulic control device according to claim 1 or 2, wherein the control means is a direction control valve so that pressure is not supplied to the hydraulic cylinder of the outrigger hydraulic jack of the corresponding tank when the pressures of the nozzles corresponding to each outrigger are equal in the horizontal state of the vehicle body. Are controlled in response to the horizontal detection means between a closed first position and a second position and a third position allowing hydraulic oil to be supplied only to the hydraulic cylinder to raise and lower the hydraulic jack of the outrigger at a relatively low position. Outrigger auto leveling device. [4] The hydraulic jack of the outrigger of claim 3, wherein the horizontal detecting means detects an outrigger having a low relative height of two outriggers in a diagonal direction, and in response to the horizontal detecting means. While controlling the hydraulic oil flow so that the height is kept fixed, the oil pressure is supplied to the hydraulic cylinder of the hydraulic jack of the outrigger of the relatively low position to increase the height of the outrigger to be the same as the other Outrigger auto leveling device.