KR102666808B1 - Method of controlling a turning of an excavator, turning control valve for performing the method, and apparatus for controlling a turning of an excavator including the turning control valve - Google Patents

Abstract

According to the excavator swing control method, hydraulic oil can be supplied from the hydraulic pump of the excavator to the swing motor. In order to alleviate the turning shock applied to the excavator before the working oil is supplied to the turning motor, a portion of the working oil may be discharged for a set time from the time of supply of the working oil. Accordingly, the amount of hydraulic oil supplied from the hydraulic pump to the turning motor is relatively reduced, so that the turning shock of the excavator can be alleviated.

Description

A swing control method for an excavator, a swing control valve for performing the same, and a swing control device for an excavator including a swing control valve AN EXCAVATOR INCLUDING THE TURNING CONTROL VALVE}

The present invention relates to a swing control method for an excavator, a swing control valve for performing the same, and a swing control device for an excavator including a swing control valve. More specifically, a method for alleviating swing shock during the swing operation of an excavator, and such method. It relates to a swing control valve for performing and a device for alleviating the swing impact of an excavator including such a swing control valve.

In general, an excavator may include a lower traveling body, an upper swinging body pivotally connected to the lower traveling body, a boom connected to the upper swinging body, an arm connected to the boom, and an attachment selectively connected to the arm. Attachments may include buckets, breakers, crushers, etc. The upper swing body can swing on the lower traveling body using hydraulic pressure. At the beginning of the turning operation of the upper swing body, a shock may be applied to the upper swing body due to strong hydraulic pressure.

According to related technologies, the turning impact can be alleviated by communicating the inlet and outlet of the turning motor that receives hydraulic pressure to turn the upper turning body. However, if the inlet and outlet of the swing motor are communicated, a decrease in turning performance such as turning speed and turning force may result.

The present invention provides a turning control method for an excavator that can alleviate turning shock while maintaining turning performance.

The present invention also provides a swing control valve for carrying out the method described above.

In addition, the present invention also provides a device capable of alleviating the swing impact of an excavator, including the swing control valve described above.

According to the swing control method of an excavator according to one aspect of the present invention, hydraulic oil can be supplied from the hydraulic pump of the excavator to the swing motor. In order to alleviate the turning shock applied to the excavator before the working oil is supplied to the turning motor, a portion of the working oil may be discharged for a set time from the time of supply of the working oil.

In exemplary embodiments, leaking a portion of the hydraulic oil may be performed from the point in time when the spool of the swing control valve that controls the flow of the hydraulic oil moves from the initial position at the time of supply to the first position.

In exemplary embodiments, the first position may be a point at which the spool moves 3 mm from the initial position.

In exemplary embodiments, the control method may further include blocking the outflow of the hydraulic oil after the spool moves from the first position to the second position.

In exemplary embodiments, the second position may be a point where the spool moves 6 mm from the first position.

A swing control valve for an excavator according to another aspect of the present invention may include a valve body and a spool. The valve body may include a first hydraulic passage connecting the hydraulic pump of the excavator and the inlet of the swing motor, and a second hydraulic passage connecting the outlet of the swing motor and the first tank. The spool is movably disposed within the valve body to selectively open and close the first and second hydraulic passages. The spool selectively connects the first hydraulic passage and the second hydraulic passage to transfer a portion of the hydraulic oil in the first hydraulic passage to the second hydraulic passage to relieve the swing shock applied to the excavator during the initial swing operation of the excavator. 2 It may have an orifice that discharges water into the first tank through a hydraulic passage.

In exemplary embodiments, the spool may further include a notch formed on the outer peripheral surface of the spool and connected to the orifice.

In example embodiments, the orifice may be opened from the time the spool moves from the initial position to the first position.

In exemplary embodiments, the first position may be a point where the spool has moved 3 mm from the initial position.

In example embodiments, the orifice may be closed after the spool moves from the first position to the second position.

In exemplary embodiments, the second position may be a point where the spool moves 6 mm from the first position.

In exemplary embodiments, the valve body may further include a third hydraulic passage connecting the second tank for recovering the hydraulic fluid to the hydraulic pump while the swing operation is not performed.

A swing control device for an excavator according to another aspect of the present invention may include a hydraulic pump, a swing motor, a first tank, and a swing control valve. The hydraulic pump can discharge hydraulic oil. The swing motor may rotate the excavator with the hydraulic oil supplied from the hydraulic pump. The first tank may recover the hydraulic oil discharged from the swing motor. The swing control valve may include a valve body and a spool. The valve body may include a first hydraulic passage connecting the hydraulic pump and an inlet of the swing motor, and a second hydraulic passage connecting an outlet of the swing motor and the first tank. The spool is movably disposed within the valve body to selectively open and close the first and second hydraulic passages. The spool selectively connects the first hydraulic passage and the second hydraulic passage to transfer a portion of the hydraulic oil in the first hydraulic passage to the second hydraulic passage to relieve the swing shock applied to the excavator during the initial swing operation of the excavator. 2 It may have an orifice that discharges water into the first tank through a hydraulic passage.

In exemplary embodiments, the spool may further include a notch formed on the outer peripheral surface of the spool and connected to the orifice.

In example embodiments, the control device may further include a second tank connected to the hydraulic pump to recover the hydraulic oil while the swing operation is not performed. The valve body may further include a third hydraulic passage connecting the hydraulic pump and the second tank.

According to the present invention described above, during the initial swing operation of the excavator, a portion of the hydraulic oil supplied from the hydraulic pump to the swing motor can be discharged. Accordingly, the amount of hydraulic oil supplied from the hydraulic pump to the turning motor is relatively reduced, so that the turning shock of the excavator can be alleviated.

1 is a hydraulic circuit diagram showing a swing control device for an excavator according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing the swing control valve of the swing control device shown in FIG. 1.
FIGS. 3 and 4 are cross-sectional views sequentially showing the operation of the swing control valve shown in FIG. 2 to control the swing of the excavator.

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

Since the present invention can be subject to various changes and have various forms, specific embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific disclosed form, and should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention. While describing each drawing, similar reference numerals are used for similar components.

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

The terms used in this application are only used to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by a person of ordinary skill in the technical field to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and unless explicitly defined in the present application, should not be interpreted in an ideal or excessively formal sense. No.

FIG. 1 is a hydraulic circuit diagram showing a swing control device for an excavator according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a swing control valve of the swing control device shown in FIG. 1.

1 and 2, the swing control device of the excavator according to this embodiment includes a hydraulic pump 110, a swing motor 120, a swing control valve 130, a first tank 140, and a second tank ( 150) may be included.

The hydraulic pump 110 may discharge hydraulic oil by pilot pressure that signals the turning operation of the excavator. The hydraulic oil discharged from the hydraulic pump 110 may be supplied to the swing motor 120. The swing motor 120 can rotate the excavator using hydraulic oil.

The first tank 140 can recover the hydraulic oil used in the turning operation discharged from the turning motor 120. The second tank 150 may recover hydraulic oil discharged from the hydraulic pump 110 that is not used in the turning operation.

The swing control valve 130 may be disposed between the hydraulic pump 110 and the swing motor 120. The swing control valve 130 may control the flow of operating oil supplied from the hydraulic pump 110 to the swing motor 120.

Swivel control valve 130 may include a valve body 132 and a spool 134. The valve body 132 may have a control passage that movably accommodates the spool 134. That is, by moving the spool 134 within the control passage of the valve body 132, the flow of hydraulic oil supplied from the hydraulic pump 110 to the swing motor 120 can be controlled.

The valve body 132 may include a main hydraulic passage 160, a first hydraulic passage 162, a second hydraulic passage 164, and a third hydraulic passage 166. The main hydraulic passage 160 may be connected to the hydraulic pump 110. The hydraulic oil discharged from the hydraulic pump 110 may flow into the main hydraulic passage 160.

The first hydraulic passage 162 may connect the main hydraulic passage 160 and the swing motor 120. The hydraulic fluid in the main hydraulic passage 160 may be supplied to the swing motor 120 through the first hydraulic passage 162.

The second hydraulic passage 164 may connect the swing motor 120 and the first tank 140. The hydraulic oil discharged from the swing motor 120 may be returned to the first tank 140 through the second hydraulic passage 164.

The third hydraulic passage 166 may connect the main hydraulic passage 160 and the second tank 150. When the turning operation is not performed, the hydraulic oil discharged from the hydraulic pump 110 may be returned to the second tank 150 through the main hydraulic passage 160 and the third hydraulic passage 166.

The spool 134 can be moved within the control passage of the valve body 132 to selectively open and close the first hydraulic passage 162, the second hydraulic passage 164, and the third hydraulic passage 166. Specifically, when the pilot pressure indicating the start of the swing operation is input to the swing control valve 130, the spool 134 moves, the first hydraulic passage 162 and the second hydraulic passage 164 are opened, and the third hydraulic passage 162 is opened. Hydraulic passage 166 may be closed. Accordingly, the hydraulic oil discharged from the hydraulic pump 110 may be supplied to the swing motor 120 through the main hydraulic passage 160 and the first hydraulic passage 162. The hydraulic oil discharged from the swing motor 120 may be returned to the first tank 140 through the second hydraulic passage 164. On the other hand, if the pilot pressure that signals the start of the swing operation is not input to the swing control valve 130, the spool 134 is moved, the first hydraulic passage 162 and the second hydraulic passage 164 are closed and the second hydraulic passage 162 is closed. 3 Hydraulic passage 166 can be opened. Accordingly, the hydraulic oil discharged from the hydraulic pump 110 can be returned to the second tank 150 through the third hydraulic passage 166.

Spool 134 may include orifice 168 and notch 169. An orifice 168 may be formed along the axial direction of the spool 134. Notch 169 may be formed on the outer peripheral surface of the spool 134. Notch 169 may be connected to orifice 168.

The orifice 168 may selectively connect the first hydraulic passage 162 and the second hydraulic passage 164. Therefore, when the first hydraulic passage 162 and the second hydraulic passage 164 are connected through the orifice 168, the fluid is discharged from the hydraulic pump 110 to the swing motor 120 through the first hydraulic passage 162. Some of the supplied hydraulic oil may be returned to the first tank 140 through the orifice 168 and the second hydraulic passage 164.

In particular, orifice 168 may connect first hydraulic passage 162 and second hydraulic passage 164 during the initial portion of the swing operation. Therefore, since a part of the hydraulic oil discharged from the hydraulic pump 110 is returned to the first tank 140 through the orifice 168 and the second hydraulic passage 164, the flow rate of the hydraulic oil supplied to the swing motor 120 is It may decrease. As a result, the impact applied when turning the excavator can be alleviated.

In this embodiment, when the pilot pressure is applied to the swing control valve 130, that is, while the spool 134 is moving from the initial position (P0) to the first position (P1), the orifice 168 is closed and The second hydraulic passage 164 may not be connected to the first hydraulic passage 162. If the second hydraulic passage 164 is connected to the first hydraulic passage 162 by opening the orifice 168 from the initial position (P0) of the spool 134, the relatively low pressure due to the partial outflow of the hydraulic oil described above. Hydraulic pressure may be transmitted to the swing motor 120. In this case, the responsiveness of the swing motor 120 may deteriorate. Therefore, in order to maintain the responsiveness of the swing motor 120, while the spool 134 moves from the initial position P0 to the first position P1, the orifice 168 is closed to open the second hydraulic passage 164. ) may not be connected to the first hydraulic passage 162.

When the spool 134 moves to the first position P1, the orifice 168 is opened so that the second hydraulic passage 164 can be connected to the first hydraulic passage 162. Accordingly, part of the hydraulic oil in the first hydraulic passage 162 can be returned to the first tank 140 through the second hydraulic passage 164. The remaining hydraulic oil may be supplied to the swing motor 120 through the first hydraulic passage 162. In this way, the hydraulic pressure applied to the turning motor 120 is lowered from the time the spool 134 reaches the first position P1, so the turning impact can be alleviated. In this embodiment, the first position (P1) may be a point where the spool 134 moves approximately 3 mm from the initial position (P0). Additionally, the first position P1 may correspond to the opening point of the notch 169. The opening point of the notch 169 may be a point at which the spool 134 moves 0.5 mm from the time the first hydraulic passage 162 is opened. However, the first position P1 may change depending on the type of excavator, the degree of turning impact, etc.

When the spool 134 moves past the first position P1 to the second position P2, the orifice 168 may be closed so that the second hydraulic passage 164 is not connected to the first hydraulic passage 162. there is. Accordingly, the entire hydraulic fluid in the first hydraulic passage 162 can be supplied to the swing motor 120 through the first hydraulic passage 162. In this embodiment, the second position (P2) may be a point where the spool 134 moves approximately 6 mm from the first position (P1). The second position P2 may be the point at which the notch 169 is closed. The point at which the notch 169 is closed may be the point at which the area of the first hydraulic line 162 rapidly increases. However, the second position P2 may change depending on the type of excavator, the degree of turning impact, etc.

Hereinafter, a method of controlling the turning operation of an excavator while alleviating the turning impact will be described in detail with reference to the accompanying drawings.

FIGS. 3 and 4 are cross-sectional views sequentially showing the operation of the swing control valve shown in FIG. 2 to control the swing of the excavator.

As shown in FIG. 2, hydraulic oil may be discharged from the hydraulic pump 110 by the pilot pressure that signals the start of the turning operation. The spool 134 may be opening the main hydraulic passage 160, the first hydraulic passage 162, and the second hydraulic passage 164. On the other hand, the spool 134 may be closing the third hydraulic passage 166. Accordingly, the hydraulic oil discharged from the hydraulic pump 110 may be supplied to the swing motor 120 through the open main hydraulic passage 160 and the first hydraulic passage 162.

When pilot pressure is applied to the swing control valve 130, the spool 134 can move from the initial position (P0) to the first position (P1). Meanwhile, in order to maintain the responsiveness of the swing motor 120, the orifice 168 may be closed so that the second hydraulic passage 164 is not connected to the first hydraulic passage 162.

As shown in FIG. 3 , when the spool 134 moves to the first position P1, the orifice 168 may be opened to connect the second hydraulic passage 164 to the first hydraulic passage 162. Accordingly, part of the hydraulic oil in the first hydraulic passage 162 can be returned to the first tank 140 through the second hydraulic passage 164. The remaining hydraulic oil may be supplied to the swing motor 120 through the first hydraulic passage 162. In this way, the hydraulic pressure applied to the turning motor 120 is lowered from the time the spool 134 reaches the first position P1, so the turning impact can be alleviated.

As shown in FIG. 4, when the spool 134 moves past the first position P1 to the second position P2, the orifice 168 is closed so that the second hydraulic passage 164 is connected to the first hydraulic passage. It may not be connected to (162). Accordingly, the entire hydraulic fluid in the first hydraulic passage 162 can be supplied to the swing motor 120 through the first hydraulic passage 162.

As described above, according to the present embodiments, during the initial swing operation of the excavator, a portion of the hydraulic oil supplied from the hydraulic pump to the swing motor may be discharged. Accordingly, the amount of hydraulic oil supplied from the hydraulic pump to the turning motor is relatively reduced, so that the turning shock of the excavator can be alleviated.

As described above, although the present invention has been described with reference to preferred embodiments, those skilled in the art may modify the present invention in various ways without departing from the spirit and scope of the present invention as set forth in the claims below. and that it can be changed.

110 ; hydraulic pump 120 ; slewing motor
130 ; Swivel control valve 132 ; valve body
134 ; Spool 140 ; 1st tank
150 ; 2nd tank 160; main hydraulic passage
162 ; First hydraulic passage 164; second hydraulic passage
166 ; Third hydraulic passage 168; orifice
169 ; notch

Claims (13)

delete delete delete delete delete delete delete delete delete delete A hydraulic pump that discharges hydraulic oil;
a swing motor that turns the excavator with the hydraulic oil supplied from the hydraulic pump;
a first tank for recovering the hydraulic oil discharged from the swing motor; and
A valve body including a first hydraulic passage connecting the hydraulic pump and the inlet of the swing motor, and a second hydraulic passage connecting the outlet of the swing motor and the first tank, and movably disposed within the valve body to selectively open and close the first and second hydraulic passages, and to selectively connect the first hydraulic passage and the second hydraulic passage to relieve the swing shock applied to the excavator during the initial swing operation of the excavator. a swing control valve including a spool having an orifice that allows a portion of the hydraulic oil in the first hydraulic passage to flow out into the first tank through the second hydraulic passage,
A swing control device for an excavator further comprising a third hydraulic passage connected to the hydraulic pump to recover the hydraulic oil while the swing operation is not performed. The swing control device of claim 11, wherein the spool further includes a notch formed on an outer peripheral surface of the spool and connected to the orifice. delete

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