KR101263955B1 - Apparatus for operating swing break - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swing brake operating device, comprising: a swing hydraulic motor (12), a swing brake (30), a brake switch valve (22), and a hydraulic drive line (P1). A branch line P3 communicating with the hydraulic tank 42 is provided in the hydraulic line P1 communicating the brake release chamber 16 and the brake switching valve 22, and the branch line P3 is disposed on the branch line P3. A valve 40 for controlling the branch line P3 is provided, and the valve 40 is electrically connected to the swing brake switch 70 which is arbitrarily manipulated by the driver, thereby providing the driver with a high load of the slope of the excavator. By operating the turning brake by manual operation, it is possible to prevent safety accidents caused by the lack of turning torque or the brake time delay function when the turning stops.

Excavator, slewing, slewing brake

Description

Swivel Brake Control {Apparatus for operating swing break}

1 is a hydraulic circuit diagram showing a turning part of an excavator according to the prior art.

2 is a hydraulic circuit diagram showing a turning part of an excavator equipped with a turning brake operating device according to the present invention.

<< Explanation of symbols for main part of drawing >>

10: turning drive part

12: swing hydraulic motor 14: swing hydraulic motor control spool

14a: relief valve

16: brake release chamber 20: time delay valve

22 brake switching valve 24 pressure reducing valve

24a: orifice

30: turning brake

40: valve 42: hydraulic tank

50: Swing Brake Operation Switch

60: swing brake selector switch

70: turning brake switch

The present invention relates to a swing brake operating device.

In particular, the present invention is to implement a safe slope work by operating the turning brake by manual operation of the safety accident caused by the lack of the turning torque during the turning or the brake time delay function when the turning stop during the turning high load operation of the excavator It relates to a turning brake control device that can be.

The turning brake release or operating relationship of the excavator according to the prior art will be described with reference to FIG.

In the swing hydraulic motor 12 of the swing drive unit 10, hydraulic oil discharged from the main pump (not shown) is controlled by the main control valve (not shown), so that "A" or "B" of the swing hydraulic motor control spool 14 It enters the port and turns right or left. Here, the maximum turning torque of the excavator is determined by the relief valve 14a incorporated in the turning drive 10.

The brake release chamber 16 is provided between the swing hydraulic motor 12 and the swing brake 30 to selectively release or operate the swing brake 30.

The time delay valve 20 is attached to the side of the turning drive part 10, and consists of the brake switching valve 22 and the pressure reduction valve 24 in which the orifice 24a was attached. Here, the operation delay time at the time of release of the turning brake 30 is determined by the orifice 24a attached to the pressure reducing valve 24 and is delayed by about 6 seconds.

The turning brake 30 of the excavator discharges hydraulic oil filled in the brake release chamber 16 when the turning or front motion is stopped, so that the first position of the brake switching valve 22 and the first position of the pressure reducing valve 24 are reduced. It is introduced into the turning hydraulic motor 12 via the brake, at which time the brake is activated. Here, the hydraulic line P1 is provided to communicate the brake release chamber 16 with the brake switching valve 22, and the drain line P2 is the brake switching valve 22, the pressure reducing valve 24 and the turning hydraulic pressure. It is provided to communicate the motor 12.

On the contrary, when the pilot brake Pi is applied to the brake switch valve 22 in the swing or front operation of the excavator, the brake switch valve 22 is switched to the second position, and the pilot hydraulic pump ( Hydraulic oil (PG) (not shown) is supplied to the brake release chamber 16, where the brake is released.

In general, an excavator is raised by turning inertia in the initial section when the working device turns from the lower side to the higher side with the heavy load exceeding the maximum turning torque according to the inclination angle on the working device on the slope. At the stop of turning, the relief valve 14a is kept open for the brake delay time and comes to the lower side without stopping.

In this case, even when the work device is turning from the high side to the low side, as described above, it cannot be stopped in the middle of the slope for the same reason. Problems exist that can pose serious risks to equipment and personnel.

An object of the present invention created to solve the above problems, safety due to the brake time delay function when the turning torque is insufficient or turning stop by operating the turning brake by the manual operation of the driver during high load operation of the slope of the excavator It is to provide a turning brake operating device that can prevent accidents in advance.

The object of the present invention is a swing hydraulic motor, a swing brake provided to suppress rotation of the swing hydraulic motor on a rotation axis of the swing hydraulic motor, and a swing brake for releasing the swing brake by receiving pressure oil therein. If there is an operating signal from the releasing chamber and the turning or other front device of the excavator, the turning brake release chamber and the pilot hydraulic pump communicate with each other so that the turning brake is released and there is no operation signal from the turning or other front device of the excavator. And a brake switching valve having a spool structure in communication with the drain line including the swing brake release chamber and the pressure reducing valve to operate the swing brake, and a hydraulic line communicating the brake release chamber and the brake switch valve. Excavation A swing drive device according to claim 1, wherein a branch line communicating with a hydraulic tank is provided in a hydraulic line communicating the brake release chamber and the brake switching valve, and a valve for controlling the branch line is provided on the branch line. The valve can be achieved by electrical connection with a swing brake switch arbitrarily operated by the driver.

Preferably, the swing brake switch includes a swing brake selection switch selected to an ON or OFF position, and a push button swing brake operation switch connected in series with the swing brake selection switch. .

Hereinafter, the configuration of the present invention with reference to the drawings in detail.

Fig. 2 is a hydraulic circuit diagram showing a swing drive unit provided with a swing brake operation device of an excavator according to the present invention.

Referring to FIG. 2, the swing brake operating apparatus according to the present invention operates a swing brake capable of switching the hydraulic tank 42 to a hydraulic line P1 for communicating the time delay valve 20 and the brake release chamber 16. It is configured to operate the turning brake 30 during operation of the valve 40 regardless of whether the turning or front operation by installing a valve 40 for. Here, reference numeral "P3" is a branch line.

First, the hydraulic circuits of the swing drive unit 10, the time delay valve 20 and the swing brake 30 will be briefly described. The swing hydraulic motor 12 of the swing drive unit 10 is discharged from a main pump (not shown). Hydraulic oil is controlled by the main control valve (not shown) to be hydraulically driven to the "A" or "B" port of the swing hydraulic motor control spool 14 to turn right or left. Here, the maximum turning torque of the excavator is determined by the relief valve 14a incorporated in the turning drive 10.

The brake release chamber 16 is provided between the swing hydraulic motor 12 and the swing brake 30 to selectively release or operate the swing brake 30.

The time delay valve 20 is attached to the side part of the turning drive part 10, and is comprised from the brake switching valve 22 and the pressure reduction valve 24 in which the orifice 24a was attached. Here, the operation delay time of the swing brake 30 is determined by the orifice 24a attached to the pressure reducing valve 24 and is delayed by about 6 seconds.

Here, the spool structure of the brake switching valve 22 will be described in detail. When there is no operation signal Pi from the turning of the excavator or the other front apparatus, the turning brake release chamber 16 is operated so that the turning brake 30 is operated. The first position to communicate with the drain line P2 including the pressure reducing valve 24, and the turning brake 30 is released when the turning signal 30 is released when there is an operation signal Pi from the turning of the excavator or other front device. It has a structure that is switched between the brake release chamber 16 and the second position in communication with the pilot hydraulic pump (PG).

The turning brake 30 of the excavator is discharged hydraulic oil filled in the brake releasing chamber 16 when there is no operation signal Pi (when turning or front operation stop) from the turning of the excavator or other front device (brake switching valve ( It enters the turning hydraulic motor 12 via the 1st position of 22 and the 1st position of the pressure reduction valve 24, and a brake is operated at this time. Here, the hydraulic line P1 is provided to communicate the brake release chamber 16 with the brake switching valve 22, and the drain line P2 is the brake switching valve 22, the pressure reducing valve 24 and the turning hydraulic pressure. It is provided to communicate the motor 12.

Conversely, the brake switching valve 22 switches to the second position when the turning brake 30 of the excavator has an operating signal Pi from turning the excavator or other front device (when turning or front operation). Hydraulic oil of the hydraulic pump PG is supplied to the brake releasing chamber 16 to release the brake.

The swing brake switch 70 of the present invention is divided into a swing brake selection switch 60 and a swing brake operation switch 50 selected to an ON or OFF position and are connected in series.

The operation of the valve 40 according to the present invention is implemented by installing the swing brake selector switch 60 using the swing brake actuation switch 50 of the joystick lever provided inside the cab. Here, the swing brake select switch 60 is energized by the battery, and is connected in series with the swing brake actuation switch 50 of the joystick lever.

The valve 40 for turning brake actuation according to the present invention is provided to interrupt the branch line P3, the first position being the original position for shorting the hydraulic tank 42 and the hydraulic line P1, and the hydraulic tank ( It is switched between 42 and the second position in communication with the hydraulic line P1.

Here, the swing brake actuation switch 50 of the joystick lever is a return manual (push button type) switch provided for switching the valve 40 from its original position to the second position. Thus, the swing brake actuation switch 50 of the joystick lever switches the valve 40 from the first position to the second position only while the swing brake select switch 60 is pressed and energized.

An operation relationship of the swing brake operating device according to the present invention will be described. Here, the operation relationship of the present invention will be described with reference to the ON state where the turning brake select switch 60 is pressed and energized.

<+ Button switch when turning or front stops>

Typically, the hydraulic oil discharged from the brake release chamber 16 generates a brake acting delay while passing through the orifice 24a via the hydraulic line P1 and the drain line P2, but the button switch 50 according to the present invention. The hydraulic oil is drained to the hydraulic tank 42 via the second position of the valve 40 through the branch line P3 having a lower pressure than the hydraulic line P1 and the drain line P2. 30) is activated.

At this time, the operating time of the turning brake 30 is shortened compared to the time delayed through the conventional drain line P2 and operated for about 1 to 2 seconds to solve the problem caused by the prior art.

<+ Button switch when turning or front operated>

Typically, the hydraulic oil supplied from the brake release chamber 16 releases the swing brake 30. Here, when the excavator turns from the lower side to the higher side with the heavy load exceeding the maximum turning torque according to the inclination angle on the work device at the slope, the initial section rises by the turning inertia force but at the middle of the slope. At the time of turning stop, the relief valve 14a does not stop in the open state during the brake delay time, but descends to the lower side. When the turning brake operation switch 50 is pressed, the hydraulic oil charged in the brake release chamber 16 is discharged and the second pressure is lowered. The drain brake 30 is actuated quickly by being drained to the hydraulic tank 42 through the valve 40 switched to the position.

On the contrary, the same is true when the excavator turns from the high side to the low side.

Therefore, the excavator equipped with the swing brake operating device according to the present invention, such as damage to the cargo loading vehicle and equipment installed around the excavator work site and accidents of workers that may be caused by the turning device control is not made when turning work on the slope There is a feature that can be prevented in advance.

For example, in the swing brake operating apparatus according to the present invention, when the driver presses the swing brake operation switch 50 provided in the cab at the same risk as the problem of the prior art in the slope high load operation of the excavator, the time for pushing the button switch 50 is pressed. The swing brake 30 is actuated quickly to prevent safety accidents.

Although the present invention described above is limited to the above-described embodiments, the present invention is not limited thereto, and the present invention may be easily modified by those skilled in the art. It is obvious that it belongs to the technical idea of the.

The present invention having the above configuration is effective to prevent the safety accident caused by the lack of the turning torque or the brake time delay function when the turning stop by operating the turning brake by the manual operation of the driver during high load operation of the slope of the excavator There is.

Claims (2)

Swing hydraulic motor 12; A turning brake 30 for suppressing rotation of the turning hydraulic motor 12; A turning brake releasing chamber (16) for receiving the pressure oil therein to release the turning brake (30); Is connected to the brake release chamber 16 through the hydraulic line (P1), when the driver's operation signal (Pi) is connected to the hydraulic line (P1) with a pilot hydraulic pump (PG) to the turning brake (30) The hydraulic oil is supplied to the brake releasing chamber 16 so as to be released, and the hydraulic line P1 is connected to the drain line P2 so that the turning brake 30 is operated when there is no driver's operation signal Pi. Brake switching valve 22 to make; Branch line (P3) is branched from the hydraulic line (P1) is connected to the hydraulic tank 42; A valve (40) installed on the branch line (P3) to control the branch line (P3); And A swing brake switch 70 capable of arbitrary operation by a driver and electrically connected to the valve 40; Swing brake operating apparatus comprising a. The method of claim 1, The swing brake switch 70 is a swing brake selection switch 60 selected to an ON or OFF position and a push button swing brake operation switch connected in series with the swing brake selection switch 60. Swivel brake operating apparatus comprising a (50).

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