KR20160116399A - Apparatus for preventing a rollback of a construction machine - Google Patents

Abstract

An apparatus for preventing a construction machine from rolling backward comprises: an angle sensor which senses the inclination angle of a construction machine; and a delay device which delays the rapid reduction of the braking pressure applied to a braking device of the construction machine according to the inclination angle of the construction machine sensed in the angle sensor, thereby supplying delay oil to a braking valve according to the inclination angle of the construction machine sensed by the angle sensor when the braking device is released. Thus, the present invention prevents the construction machine from rolling backward on a slope by preventing the braking pressure of the braking device from being rapidly reduced by the delay oil.

Description

TECHNICAL FIELD [0001] The present invention relates to an anti-

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an anti-jamming device for a construction machine, and more particularly, to an apparatus for preventing a wheel excavator from being pushed on an inclined jig.

Generally, an excavator may include a lower traveling body, a pivotal connection pivotally connected to the lower traveling body, a boom connected to the upper pivoting body, an arm connected to the boom, and an attachment selectively connected to the arm. Attachments may include buckets, breakers, crushers, and the like.

According to the related art, when the excavator stopped at the slope moves upward, the excavator is pushed back by the weight of the excavator, and a safety accident may occur. Even if the excavator is heavily thrown, the excavator may overturn.

The present invention provides an apparatus capable of preventing the jamming of a construction machine on a slope.

The anti-skid device of the construction machine according to one aspect of the present invention may include an angle sensor and a delay mechanism. The angle sensor can sense the tilt angle of the construction machine. The delay mechanism may delay the sudden decrease of the braking pressure applied to the braking mechanism of the construction machine according to the inclination angle of the construction machine detected by the angle sensor.

In the exemplary embodiments, the delay mechanism includes a delay pump that supplies delay oil to a braking valve that supplies braking oil to the braking mechanism, and a delay pump that is disposed between the delay pump and the braking valve, And a delay valve controlling the supply of the delay oil according to the tilt angle of the construction machine.

In exemplary embodiments, the delay oil may have a pressure lower than the braking oil pressure.

In exemplary embodiments, the delay valve may include an Electronic Proportional Pressure Reducing Valve (EPPRV).

In exemplary embodiments, the delay mechanism may further include a check valve disposed between the delay valve and the braking valve, the check valve preventing the delay oil from flowing back to the delay valve.

In the exemplary embodiments, the anti-skid device may further include a controller for releasing the braking mechanism by a signal from the angle sensor and controlling the operation of the delay mechanism.

In exemplary embodiments, the construction machine may include a wheel excavator.

According to the present invention, when the braking mechanism is released, the delay mechanism can supply delay oil to the braking valve according to the inclination angle of the construction machine sensed by the angle sensor. Therefore, the braking pressure of the braking mechanism can be prevented from being drastically reduced by the delayed oil. As a result, it is possible to suppress the phenomenon that the construction machine is pushed backward on the slope.

1 is a block diagram showing an anti-jamming device for a construction machine according to an embodiment of the present invention.
2 is a braking hydraulic circuit diagram of a wheel excavator to which the apparatus shown in Fig. 1 is applied.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a part or a combination thereof is described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

FIG. 1 is a block diagram showing an anti-jamming device of a construction machine according to an embodiment of the present invention, and FIG. 2 is a braking hydraulic circuit diagram of a wheel excavator to which the device shown in FIG. 1 is applied.

1 and 2, the anti-jamming device of the construction machine according to the present embodiment may include a tilt sensor 110, a control unit 120, and a delay mechanism 130.

The anti-skid device of this embodiment can be applied to the braking device of a wheel excavator. The braking mechanism may include a docking station 140, a braking valve 150, and front and rear brakes 162 and 164. The mobilization source 140 can discharge the brake fluid to the front brake 162 and the rear brake 164. The braking valve 150 may include a front valve 152 and a rear valve 154. The front valve 152 is disposed between the damping source 140 and the front brake 162 to control the braking oil supplied from the damping source 140 to the front brake 162. [ The rear valve 154 is disposed between the damping source 140 and the rear brake 164 to control the braking oil supplied from the damping source 140 to the rear brake 164.

The inclination sensor 110 may be attached to the wheel excavator so as to sense the inclination angle of the wheel excavator located on the slope. The control unit 120 can release the braking mechanism by the signal from the angle sensor 110. [ That is, the control unit 120 can detect the operation of the traveling pedal on the inclined place and release the braking mechanism of the traveling motor. In addition, the control unit 120 can control the operation of the delay mechanism 130. [

The delay mechanism 130 can delay the braking pressure of the wheel excavator starting from the slope by a control signal of the control unit 120 by using the delay oil so as to prevent the wheel excavator from being pushed back from the slope . When the braking mechanism is released, the braking oil can be returned to the braking valve 150 at a high speed from the front and rear brakes 162 and 164. Therefore, the braking pressure of the front and rear brakes 162 and 164 can be drastically reduced. However, the delayed oil supplied from the delay mechanism 130 to the braking valve 150 delays the quick return of the braking oil so that the braking pressure of the front and rear brakes 162 and 164 is prevented from being drastically reduced.

The operation of the delay mechanism 130 may be determined by the tilt angle of the wheel excavator sensed by the tilt sensor 110. The inclination angle of the wheel excavator that determines the operation of the delay mechanism 130 can be set in the control unit 120. [

The delay mechanism 130 may include a delay pump 132, a delay valve 134, a drain tank 136, and a check valve 138.

The delay pump 132 may be connected to the front valve 152 of the braking valve 150 via a first delay line 156. The delay pump 132 may also be connected to the rear valve 154 via a second delay line 158. The delay pump 132 may supply delay oil to the front valve 152 and the rear valve 154. [ The delay oil supplied to the front valve 152 and the rear valve 154 can suppress the sudden decrease of the braking oil pressure. In other words, the delay oil causes the braking pressure to be gradually lowered, thereby preventing the wheel excavator from being pushed backward on the slope. If the retarding oil pressure is higher than the braking oil pressure, the braking force will not be released. Therefore, the retarding oil pressure may be lower than the braking oil pressure.

The delay valve 134 may be disposed between the delay pump 132 and the braking valve 150 to control the flow of the retarding oil supplied from the delay pump 132 to the braking valve 150. The delay valve may include an Electronic Proportional Pressure Reducing Valve (EPPRV).

The drain tank 136 may be connected to the delay valve 134. The delay oil can be recovered to the drain tank 136.

The check valve 138 may be disposed between the delay valve 134 and the braking valve 150. The check valve 138 can prevent the delayed flow from flowing backward from the braking valve 150 to the delay valve 134. [ Therefore, the delay oil can flow only from the delay valve 134 toward the braking valve 150 by the check valve 138. As a result, the delay valve 134 can be protected by the check valve 138 since it does not flow from the braking induction brake valve 150 to the delay valve 134. In particular, the check valve 138 can prevent the brake from being released upon long-term parking of the wheel excavator.

On the other hand, in the present embodiment, it is illustrated that the anti-skid device is applied to a wheel excavator. However, the anti-skid device of the present embodiment can be applied to other construction machines driven by a wheel as well as a wheel excavator.

As described above, according to the present embodiments, when the braking mechanism is released, the delay mechanism can supply the delay oil to the braking valve in accordance with the inclination angle of the construction machine sensed by the angle sensor. Therefore, the braking pressure of the braking mechanism can be prevented from being drastically reduced by the delayed oil. As a result, it is possible to suppress the phenomenon that the construction machine is pushed backward on the slope.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. And changes may be made without departing from the spirit and scope of the invention.

110; Angle sensor 120; The control unit
130; Delay mechanism 132; Delay pump
134; Delay valve 136; Drain tank
138; Check valve 140; Mobilization
150; A braking valve 152; Front valve
154; A rear valve 156; The first delay line
158; A second delay line 162; Front brake
164; Rear brake

Claims (6)

An angle sensor for detecting the tilt angle of the construction machine; And
And a delay mechanism for delaying the abrupt decrease in the braking pressure applied to the braking mechanism of the construction machine according to the inclination angle of the construction machine detected by the angle sensor,
The delay mechanism
A delay pump for supplying delay oil to the braking valve for supplying braking oil to the braking mechanism; And
And a delay valve disposed between the delay pump and the brake valve for controlling the flow of the delayed oil in accordance with an inclination angle of the construction machine detected by the angle sensor. The anti-jamming device for a construction machine according to claim 1, wherein the delay oil has a pressure lower than the braking oil pressure. The apparatus according to claim 1, wherein the delay valve includes an electronic proportional pressure reducing valve (EPPRV). The anti-jamming device of claim 1, wherein the delay mechanism further comprises a check valve disposed between the delay valve and the braking valve, the check valve preventing the delay oil from flowing back to the delay valve. The apparatus according to claim 1, further comprising a control unit for releasing the braking mechanism by a signal from the angle sensor and controlling the operation of the delay mechanism. The apparatus according to claim 1, wherein the construction machine includes a wheel excavator.

Images