KR20160015630A - Swing Control Apparatus of Heavy Equipment with Slip Protecting Function for Swing Operation - Google Patents

Abstract

The present invention relates to a method and apparatus for preventing a phenomenon in which an upper portion of a heavy equipment is prevented from being pushed during a turning operation on a slope by allowing a heavy construction equipment such as an excavator to be located on a slope, To a swing control device of a heavy equipment capable of preventing the swing during operation.
The present invention includes a swing motor (210); A direction switching valve (250) for switching the direction of rotation of the swing motor (210) according to a swing operation direction; An on-off valve (260) for allowing a pilot pressure to be provided in accordance with a turning operation direction; Closing time delay valve consisting of a variable orifice 272 and a pressure reducing valve 270 which are provided to be delayed when the pilot pressure is supplied to the on-off valve 260; And an accumulator 280 connected to the swing motor 210 so that the hydraulic fluid is supplied to the swing motor 210 while the operation of the swing motor 210 is delayed.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swing control apparatus and a swing control apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a heavy equipment turning control apparatus capable of preventing pivoting during a turning operation, and more particularly, to a turning control apparatus for a heavy equipment such as an excavator, So that the upper part of the heavy equipment can be prevented from being pushed down on the slope.

An excavator (also known as a "crane" or "excavator"), which is the most widely used heavy equipment used in various construction sites, is very effectively used for excavating and loading earth using buckets.

The excavator is composed of a traveling part provided with a wheel or a caterpillar, a turning part provided on the upper part of the traveling part, and a working mechanism part including a breaker or a bucket attached to the front of the turning part. .

The swivel part and the working mechanism part are operated with a great force from the hydraulic device. In a conventional excavator, when a workpiece is contained in a bucket or the like on a slope and a heavy load is applied, a phenomenon occurs in the swiveling operation.

In other words, when the leakage occurs in the MCV (Main Control Valve) spool or the internal leakage of the swing motor occurs, or the load increases due to the increase of the inclination angle at the slope, the swing relief valve There is a problem that the phenomenon of pushing occurs.

Korean Patent Publication No. 10-2000-0024990 (published on May 5, 2000)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a brake system for a vehicle, Which is capable of preventing slippage caused by a medium or high load on a slope when the vehicle is turned off.

According to an aspect of the present invention, there is provided a solenoid valve comprising: a swing motor; A direction switching valve for switching a rotating direction of the swing motor according to a swing operation direction; An open / close valve for allowing a pilot pressure to be provided in accordance with the turning operation direction; An opening / closing time delay valve comprising a variable orifice and a pressure reducing valve provided to be delayed when the pilot pressure is provided to the on / off valve; And an accumulator connected to supply the hydraulic fluid to the swing motor while the operation of the swing motor is delayed to prevent the swing motor from being pushed by the slope.

In addition, a shuttle valve is further provided on the pilot channel on the front side of the opening / closing time delay valve so as to provide a pilot pressure regardless of the direction of the swing operation.

In addition, a switching valve is further provided on the pilot flow path at the front position of the opening / closing time delay valve.

Further, the variable orifice is composed of a throttle valve.

Further, the variable orifice comprises a proportional flow rate control valve.

The variable orifice includes a sensor for sensing the slope of the ground and a controller for adjusting the opening of the proportional flow rate control valve in proportion to the amount of sensing by the sensor.

As described above, according to the present invention, the operation of the opening / closing valve is delayed by the opening / closing time delay valve when working on a work site through a heavy equipment such as an excavator, It is possible to prevent a phenomenon in which the swing motor is held at a predetermined pressure, and in particular, a phenomenon in which the swing motor is pivoted during a swing operation in a state in which a medium or high load is applied to the slope.

1 is a circuit block diagram of a swing control apparatus according to an embodiment of the present invention.
2 is a circuit diagram of a swing control apparatus according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a circuit block diagram of a swing control apparatus according to an embodiment of the present invention. As shown in the drawing, the swing control apparatus 200 according to an embodiment of the present invention will be described by taking an excavator as an example of a heavy equipment.

The excavator swing controller 200 includes a swing motor 210 capable of swinging the excavator main body and a brake chamber 220 for selectively braking and releasing the swing motor 210.

A piston 222 and an elastic member 224 are provided in the brake chamber 220. The piston 222 is provided with a swing brake 226 (a friction plate in this embodiment) for braking the swing motor 210, The operation of the swing motor 210 depends on whether the brake is operated or not.

The pressure oil discharged from the main pump (not shown) flows into the main port A or the main port B so that the swing motor 210 rotates clockwise (rotation by the main port A) or leftward ) Rotation).

The swing control apparatus 200 according to an embodiment of the present invention basically receives an operation signal through the brake pilot port SH and has a brake release port PG and is provided with a brake chamber 220, And a hydraulic line K for communicating with the brake switching valve 230 while having an orifice 242 so that the operation of the orbiting brake 226 can be delayed, And a time delay valve composed of a pressure reducing valve 240 connected thereto.

The brake switching valve 230 blocks the hydraulic line K by the pilot pressure SH generated in the swing operation on the hydraulic line K and when the pilot pressure SH is not applied, And serves to communicate the line (K).

The piston 222 is moved (left in the drawing) by the elastic force of the elastic member 224, so that the orbiting brake 226 is operated And a hydraulic line P1 for supplying the hydraulic pressure by connecting the brake chamber 220 and the brake switching valve 230 is provided.

The hydraulic pressure line P2 is connected between the pressure reducing valve 240 and the swing motor 210.

Here, according to the embodiment of the present invention, the rotation pilot pressure is generated to the left or right according to the operation of the RCV lever (LV). In the turning operation, A direction switching valve 250 is provided.

1, the flow paths L1 and L2 connected to the directional control valve 250 are formed to the left or right of the RCV lever L. [

According to an embodiment of the present invention, an on-off valve 260 is provided which is operated by the RCV lever L. This on-off valve 260 can be opened or closed regardless of whether the RCV lever L is operated to the left or right And is connected to a shuttle valve 262 which is provided to operate independently.

The on / off valve 260 is operated by using the pilot pressure generated by the operation of the RCV lever L and is connected to the on / off valve 260 by the pilot line L3 via the shuttle valve 262, Pressure is transmitted.

According to an embodiment of the present invention, an open / close time delay valve is provided. The open / close time delay valve has a structure including a pressure reducing valve 270 and a variable orifice 272.

The pressure reducing valve 270 and the variable orifice 272 can adjust the delay time manually or automatically according to the degree of inclination of the slope when the heavy equipment (for example, an "excavator") is turned on a slope.

More specifically, the pressure reducing valve 270 and the variable orifice 272 are provided between the on-off valve 260 and the shuttle valve 262 so that the pilot pressure generated by the operation of the RCV lever L Thereby delaying the supply of the flow rate, thereby delaying the operation of the on-off valve 260.

Further, a switching valve 274 having an orifice is further provided on the pilot channel L3 on one side of the pressure-reducing valve 270.

The delay time during which the pilot flow rate is supplied is adjusted according to the opening amount of the variable orifice 272. The variable orifice 272 may be a passive variable orifice and may be provided as a throttle valve. In this case, the driver appropriately adjusts the opening amount of the variable orifice 272 according to the inclination of the inclined paper.

2, the variable orifice 272 is an electronically controlled variable orifice, which can be constituted by a proportional flow rate control valve. The variable orifice 272 includes a sensor 300 for sensing the slope of the ground, The control unit 310 may control the opening amount of the proportional flow rate control valve in proportion to the amount of the flow rate control valve.

Therefore, when turning on a slope, the delay time of the opening / closing time delay valve can be automatically adjusted according to the inclination.

According to an embodiment of the present invention, an accumulator 280 is provided between the directional control valve 250 and the on-off valve 260 so as to be supplied with the operating fluid in a charged state, It has one structure.

The accumulator 280 is configured such that the oil passage F to which the high-pressure hydraulic fluid is supplied is always connected to fill the swing motor 210 with the hydraulic oil so as to prevent the swinging of the inclined gear during the swing operation, As shown in FIG.

The hydraulic pressure of the swing motor 210 is maintained by the supply of the hydraulic fluid filled in the accumulator 280 while the on-off valve 260 is being delayed and operated so that the heavy equipment such as an excavator is operated in a state where the medium- It is possible to prevent the phenomenon of being pushed when turning operation is performed.

The relief valves 290 and 292 are connected to the hydraulic lines of the main ports A and B so that the pivoting hydraulic pressure supplied from the main pump to the swing motor 210 does not exceed a predetermined pressure.

2, DB denotes a drain port, PA and PB denote gauge ports, and C denotes a makeup port connected to a storage tank in which hydraulic oil is stored.

Further, according to the embodiment of the present invention, at the time of swinging operation in the flat ground, the opening amount of the variable orifice 272 constituting the opening / closing time delay valve is configured to operate in a state of being opened to the maximum, can do.

The operation of the swing control apparatus according to an embodiment of the present invention will now be described.

First, when the driver operates the RCV lever L (to the right or left) for the swing operation, the hydraulic fluid is supplied to the main port A or the main port B. During RCV operation, the pilot pressure is actuated immediately on the brake pilot port (SH) to release the swing brake.

The pressure of the hydraulic oil supply port (the main port A or the main port B) is momentarily transmitted to the relief valves 290 (292) and 294 (292) because the swing operation is not immediately performed due to the influence of the excavator upper inertia and the frictional force. (The pressure at which the relief valves 290 and 292 start to open).

When the driver places the RCV lever L in the neutral position during the swing operation, the supply of the flow to the main port A or the main port B is cut off. However, since the upper portion of the excavator is continuously rotated by the inertia, (210) also rotates.

When the swing brake 226 is operated so as to perform the swing brake operation during the swing operation by inertia, there is a danger that the swing brake 226 is damaged. The swing brake 226 absorbs the impact generated when the swing operation is stopped, The operation of the swing brake 226 is delayed through the time delay valve composed of the pressure reducing valve 240 and the orifice 242. [

On the other hand, when the revolving portion rotates due to inertia in the neutral state of the RCV lever L in which the orbital braking is performed, the hydraulic line to which the operating oil is supplied is shut off from the supply of hydraulic oil through the port (main port A or B) The volume of the hydraulic line is increased by the swing operation in the state where the hydraulic oil is circulated, and there is a risk that cavitation phenomenon occurs in which the pressure is lowered and air dissolved in the hydraulic oil is vaporized. At this time, makeup valves 294 and 295 (check valves shown on the relief valves 290 and 292 in FIG. 3) are operated to supply hydraulic oil to the hydraulic line from a storage tank (not shown) .

On the other hand, the port (main port A or B) opposite to the port (main port A or B) to which the hydraulic fluid has been supplied is connected to the port (main port A or B) The pressure of the hydraulic line through the relief valves 290 and 292 is limited to a set pressure or less, although the pressure of the hydraulic line is instantaneously increased.

In this way, the braking pressure that interferes with the swing operation is formed, so that the swinging operation is stopped. Even when the swing operation is almost stopped, if the pressure of the hydraulic line is maintained at a high level, . In order to prevent such a phenomenon, the reversal prevention valves 296 and 297 (the valves shown in the lower part of the relief valves 290 and 292 in FIG. 1) are provided to return the flow rate of the hydraulic line to the storage tank, When it is almost stopped, the pressure of the hydraulic line is released. As described above, by repeating the formation and release of the braking pressure, the turning operation finally stops.

Here, the present invention is particularly designed to prevent the heavy equipment from being pushed when turning on a slope in a state where a heavy load is applied to the heavy equipment, and the turning operation and the braking operation will be described in more detail as follows.

[Turning braking at a slope]

As shown in Fig. 1, when the RCV lever L is operated to the neutral position in the turning operation of the heavy equipment in which the medium load and the high load are applied on the slope, the operation signal is not inputted through the brake pilot port SH, The port PG is blocked and the brake releasing pressure transmitted to the brake chamber 220 is interrupted so that the elastic force of the elastic member 224 causes the piston 222 to move to the left in the drawing and the orbiting brake 226 is squeezed The braking operation of the swing motor 210 is performed.

When the brake is released, the brake release port PG is shut off, and the pressurized fluid filled in the brake chamber 220 is discharged to the swing motor 240 via the brake switching valve 230, the orifice 242, 210 to the tank. As a result, the braking operation is delayed, thereby preventing the shock caused by the inertia of the swing motor 210.

On the other hand, it is preferable that the operation of the revolving brake 226 is delayed to some extent. The brake operation is performed by delaying the brake time through the orifice 242 (generally about 1.5 to 5 seconds) because the operation of the sudden brake may cause the breakage of the swing brake 226 rather.

Further, the pilot flow rate supply to the pilot flow passage L3 is interrupted via the shuttle valve 262, the directional control valve 250 maintains the final position, and the switching valve 274 is switched while the pilot flow rate supply is stopped.

At this time, the on-off valve 260 is returned to the locked position by the switching valve 274 in the switched state. The time delay in which the on-off valve 260 is returned to the locked position is set to a time during which the turning brake is sufficiently performed.

Under these circumstances, the above-described relief valve 290, 292, anti-reverse valve 296, 297, make-up valve 294, 295 and time delay valve are actuated.

[Turning operation on a slope]

The pilot flow rate sequentially passes through the shuttle valve 262 and the pilot flow path L3 in accordance with the left or right directional operation of the RCV lever L at the turning operation of the heavy equipment in which the heavy load is applied to the slope, At the same time, the directional control valve 250 is immediately activated and switched by the pilot pressure, and the switching valve 274 is switched by the pilot pressure.

A pilot orifice 272 and a pressure reducing valve 270 are provided in the pilot flow passage L3 supplied to the opening and closing valve 260 through the shuttle valve 262. The pilot flow passage L3, A time delay of the flow rate passing through the pressure reducing valve 270 is generated in accordance with the opening amount of the variable orifice 272.

When the time-delayed pilot flow rate acts on the on-off valve 260, the on-off valve 260 is switched to the open position.

Therefore, during the time delay, the on-off valve 260 is in the locked position and the hydraulic pressure acts on the swing motor 210 by the hydraulic fluid filled in the accumulator 280, In operation, the phenomenon of pushing can be prevented (or reduced).

However, in the present invention, when the hydraulic oil is supplied to the swing motor 210 by the accumulator 280, the swing motor 210 is rotated by the swing motor 210, Therefore, even if the rotation of the swing motor 210 occurs, it can be compensated.

In the present invention, since the open / close valve 260 is blocked while the pilot flow rate supply time is delayed to the open / close valve 260, the load increases during the swing operation in accordance with the inclination angle of the slope and the relief valve 290 ) And the internal leakage of the MCV spool can be prevented.

In the present invention, the opening / closing time delay valve is equipped with a variable orifice 272, and the delay time can be manually or automatically adjusted according to the degree of inclination of the inclined paper.

In other words, when the variable orifice 272 is a passive type throttle valve, the driver adjusts the delay time by appropriately adjusting the opening amount of the variable orifice 272 according to the inclination of the inclined surface.

2, when the variable orifice 272 is a proportional flow control valve, the inclination of the ground is sensed by the sensor 300 and the opening amount of the proportional flow control valve is adjusted in the control unit 310 The delay time of the opening / closing time delay valve is automatically adjusted in accordance with the inclination when the turning operation is performed on the slope.

The above swinging operation is realized and a general swinging operation is performed by the pressure supplied to the main port A or the main port B. The pilot signal is inputted through the brake pilot port SH The brake release valve PG is connected and opened so that the hydraulic pressure acts on the piston 222 of the brake chamber 220. As a result,

The elastic force of the resilient member 224 provided in the brake chamber 220 is overcome by the hydraulic pressure thus operated and the piston 222 is moved to the right in the drawing to release the swing brake 226 to release the swing brake state .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, But fall within the scope of the appended claims.

200:
210: Swivel motor
220: Brake chamber
222: piston
224: elastic member
226: turning brake
240: Pressure reducing valve
242: Orifice
250: Directional switching valve
260: opening / closing valve
262: Shuttle valve
270: Pressure reducing valve
272: variable orifice
274: Switching valve
280: accumulator
290,292: relief valve
294,295: Makeup valve
296,297: Anti-reverse valve
300: sensor
310: Control device
A, B: Main port
DB: drain port
F: Euro
K: Hydraulic line
L: RCV lever
L1, L2:
L3: Pilot flow
P1: Hydraulic line
PA, PB: Gauge port
PG: Break release port
SH: Brake pilot port

Claims (6)

A swing motor 210;
A direction switching valve (250) for switching the direction of rotation of the swing motor (210) according to a swing operation direction;
An on-off valve (260) for allowing a pilot pressure to be provided in accordance with a turning operation direction;
Closing time delay valve consisting of a variable orifice 272 and a pressure reducing valve 270 which are provided to be delayed when the pilot pressure is supplied to the on-off valve 260;
An accumulator 280 connected to supply the hydraulic fluid to the swing motor 210 while the operation of the swing motor 210 is delayed so that the swing motor 210 is prevented from being thrown up;
And a control unit for controlling the turning of the vehicle.
The method according to claim 1,
And a shuttle valve (262) is provided on the front pilot line (L3) of the opening / closing time delay valve to provide a pilot pressure regardless of the direction of swirling operation. .
The method according to claim 1,
And a switching valve (274) is further provided on the pilot line (L3) at the front position of the opening / closing time delay valve.
The method according to claim 1,
Characterized in that the variable orifice (272) comprises a throttle valve.
The method according to claim 1,
Characterized in that the variable orifice (272) is constituted by a proportional flow rate control valve.
The method of claim 5,
The variable orifice 272 includes a sensor 300 for sensing the inclination of the ground and a control unit 310 for adjusting the opening amount of the proportional flow rate control valve in proportion to the sensing amount of the sensor 300 Which is capable of preventing the turning of the vehicle during turning operation.

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