KR101428099B1 - Hydraulic circuit for construction machinery - Google Patents

Abstract

The hydraulic circuit of the construction machine according to the present invention includes a first work first speed control valve 130 for controlling the flow direction of the hydraulic fluid discharged from the first pump P1 and supplying the same to the first working machine 110; A second working first speed control valve (150) for controlling the flow direction of the hydraulic fluid discharged from the second pump (P2) and supplying the same to the second working machine (120); Is converted into the position of either the neutral position 141 or the conversion position 142 and the operating oil discharged from the second pump P2 is converted from the first pump P1 The first working second-speed control valve (140) which is discharged and joined to the working oil supplied to the first working machine (110) and supplied to the first working machine (110); The first pump P1 is converted into the neutral position 161 and the conversion positions 162 and 163. When the conversion position is converted into the conversion positions 162 and 163, The second working second-speed control valve (160) which is discharged from the second pump (P2) and joined to the working oil supplied to the second working machine (120) and supplied to the first working machine (110); The first and second work speed control valves 140 and 160 are converted into neutral positions 141 and 161 and the first and second working speeds are discharged from the first and second pumps P1 and P2 (470), (270), (370), (470), and (470) that block the supplied working fluid from being supplied to each of the working machines (110, 120) through the first and second work speed control valves ).

Junction circuit, separation circuit, working machine, precision position control, power loss

Description

HYDRAULIC CIRCUIT FOR CONSTRUCTION MACHINERY

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine such as an excavator and the like, and relates to a hydraulic circuit of a construction machine, which can be efficiently used for a work requiring a precise position control of a work device, such as a planarization work on the ground or a crane work.

Generally, a construction machine such as an excavator performs various operations such as excavation, transportation, and cargo transportation. Most of these tasks require large workloads or require fast operation speeds. Accordingly, the working oil discharged from the plurality of pumps is joined and supplied to the boom cylinder and the arm cylinder.

For example, the boom first-speed control valve controls the flow direction of the hydraulic fluid discharged from the first pump to supply to the boom cylinder, and the boom second-speed control valve controls the flow direction of the hydraulic fluid discharged from the second pump, Supply. The arm first-speed control valve controls the flow direction of the operating oil discharged from the second pump to supply to the arm cylinder, and the arm second-speed control valve controls the flow direction of the operating oil discharged from the first pump to supply to the arm cylinder do.

That is, the hydraulic fluid discharged from the first pump is supplied to the boom cylinder and the arm cylinder through the boom first-speed control valve and the arm second-speed control valve, respectively, and the hydraulic fluid discharged from the second pump is supplied to the arm- And is supplied to each of the arm cylinder and the boom cylinder through each of the quick control valves.

However, in the hydraulic circuit as described above, the hydraulic oil discharged from one pump is divided and distributed between the boom cylinder and the arm cylinder, and the flow rate of the hydraulic fluid supplied to the boom cylinder and the arm cylinder varies depending on the load applied to the boom and the arm. For example, when a large load acts on the boom, the flow rate of the hydraulic fluid supplied to the arm cylinder becomes large while the flow rate of the hydraulic fluid supplied to the boom cylinder becomes small, and vice versa.

In the conventional hydraulic circuit, the flow rate or the pressure of the hydraulic fluid supplied to the other working machine may be changed according to the load of one of the working machine, so that it is useful for a work requiring a high driving speed of the boom and the arm. It is difficult to control the detailed position of the boom and the arm.

Further, since the pressure of the operating oil discharged from the pump is formed based on the pressure of the cylinder of the working machine having a large load among the boom and the arm, the operating oil of a necessary pressure is supplied to the cylinder having a relatively small load, . This throttle loss eventually results in a loss of power to the construction machine, which reduces fuel economy.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hydraulic circuit of a construction machine capable of reducing power loss of a construction machine and facilitating precise position control of a work device .

In order to achieve the above object, a hydraulic circuit of a construction machine according to the present invention is characterized in that a hydraulic circuit of a construction machine is provided with a first work speed control unit for controlling a flow direction of hydraulic fluid discharged from a first pump (P1) A valve 130; A second working first speed control valve (150) for controlling the flow direction of the hydraulic fluid discharged from the second pump (P2) and supplying the same to the second working machine (120); A converting position 142 for converting the operating oil discharged from the second pump P2 into the working oil discharged from the first pump P1 and supplied to the first working machine 110, A first working second-speed control valve (140) having a neutral position (141) for supplying only the working oil discharged from the first pump (P1); A conversion position 162 or 163 for allowing the hydraulic fluid discharged from the first pump P1 to be discharged from the second pump P2 and merging with the hydraulic fluid supplied to the second working machine 120, 120) includes a second working second-speed control valve (160) having a neutral position (161) for supplying only the operating oil discharged from the second pump (P2); And a separating unit 170 (270) for switching the first and second working second-speed control valves (140, 160) to the neutral position 141, 161 or the converting positions 142, 162, 163 ) 370 (470).

According to an embodiment of the present invention, the separation unit 170 includes a separation switch 174 for generating the separation signal; And first and second operating portions 101 and 102 for generating signal pressures for driving the first and second working machines 110 and 120 and the first and second working second-speed control valves 140, 102a and 102b for connecting the respective pressure receiving portions 140a, 160a and 160b of the signal line 160 to each of the signal lines 101a, 102a and 102b in accordance with a signal generated from the separation switch 174, 172 and 173 for selectively applying signal pressures of the pressure receiving portions 101a, 102a and 102b to the pressure receiving portions 140a, 160a and 160b.

According to another embodiment of the present invention, the separation unit 270 includes a separation switch 274 for generating the separation signal; And a signal transmission unit connected to each of the signal application units 240a, 260a and 260b of the first and second work control valves 140 and 160 for signal transmission, The first and second work control valves 140 and 160 are switched to the neutral positions 141 and 161 when the first and second operation control valves 140 and 160 are generated And a control unit 271 for applying the control signal.

According to another embodiment of the present invention, the separation units 370 and 470 may include a work pattern signal generator 372 for generating a signal for a work pattern of the first and second work machines 110 and 120, (472); And to the signal application units 240a, 260a and 260b of the first and second work speed control valves 140 and 160. The operation pattern signal generator 372 472, compares the calculated current operation pattern with a predetermined reference operation pattern, and if the current operation pattern matches a preset reference operation pattern, the first and second A control unit 371 471 for applying a signal to each of the signal application units 240a, 260a and 260b so that each of the second-speed work control valves 140 and 160 is converted into a neutral position 141 and 161, .

The operation pattern signal generator 372 may include first and second operation units 372a and 372b for generating signals for driving the first and second work machines 110 and 120, , The control unit 371 can calculate the current operation pattern from the signals generated from the first and second operation units 372a and 372b.

The first working machine 110 is a boom cylinder 110 for driving the boom 103. The second working machine 120 is an arm cylinder 120 for driving the arm 104, The pattern signal generator 472 includes a first sensor 472a for sensing the position of the boom 103; And a second sensor 472b for sensing the position of the arm 104. The controller 471 may determine the current position of the arm 104 from the information about the position of the boom 103 and the arm 104, The pattern can be calculated.

According to the above-described problem, the separation unit converts the first and second working second-speed control valves to the neutral position, so that the operating fluid discharged from the first and second pumps (P1, P2) And the second work-use second-speed control valve, the hydraulic oil discharged from each pump can be independently supplied to each of the working machines, thereby precisely controlling the position of each of the working machines.

In addition, by supplying the operating oil discharged from each pump independently to each of the working machines by the separation unit, it is possible to prevent unnecessary high-pressure operating oil from being supplied to the working machine, thereby minimizing the power loss of the construction machine .

Further, the control unit of the separation unit automatically determines and controls whether or not to calculate the current operation pattern and to separate the circuits or merge the circuits, thereby greatly increasing the convenience of operation of the construction machine.

Hereinafter, a hydraulic circuit of a construction machine according to an embodiment of the present invention will be described in detail.

Referring to FIG. 1, the hydraulic circuit of the construction machine according to the first embodiment of the present invention includes a first work speed control valve 130, a second work first speed control valve 150, A control valve 140, a second working second-speed control valve 160, and a separation unit 170.

The first working-purpose one-speed control valve 130 and the first working-purpose two-speed control valve 140 are connected to the first working unit 110 via the first operating unit 101, And controls the flow direction.

The second work-use one-speed control valve 150 and the second work-use second-speed control valve 160 are controlled by a signal generated by the second operating portion 102 to be supplied to the second working machine 120 And controls the flow direction.

In the present embodiment, the boom cylinder 110 is connected to the first working machine 110, the arm cylinder 120 is connected to the second working machine 120, The boom first-speed control valve 130 and the boom second-speed control valve 140 are connected to the valve 130 and the first work-use second-speed control valve 140 via the second work-use one-speed control valve 150 and the second work- And the arm first-speed control valve 150 and the arm second-speed control valve 160 will be described with reference to FIG. However, the idea of the present invention can be applied not only to the boom cylinder and the arm cylinder but also to other working machines.

The boom first speed control valve 130 is connected to the first pump P1 and the other is connected to the boom cylinder 110 to control the flow direction of the hydraulic fluid discharged from the first pump P1 To the boom cylinder (110). The boom first-speed control valve 130 is configured such that the signal pressure generated from the first operating portion 101 is applied to each of the first and second pressure-receiving portions 130a and 130b to be converted, 130, the flow direction of the hydraulic fluid supplied to the boom cylinder 110 is controlled.

The arm first-speed control valve 150 is connected to the second pump P2 on one side and the arm cylinder 120 on the other side, and controls the flow direction of the hydraulic fluid discharged from the second pump P2 And supplies it to the arm cylinder 120. The arm first-speed control valve 150 is configured such that a signal pressure generated from the second operating portion 102 is applied to one of the first and second pressure-receiving portions 150a and 150b to be converted, The flow direction of the hydraulic fluid supplied to the arm cylinder 120 is controlled by the conversion of the valve 150. [

The boom second-speed control valve 140 is connected to the second pump P2 and the other is connected to the rising side 110a of the boom cylinder 110 to discharge hydraulic oil discharged from the second pump P2 And selectively supplies to the up side 110a of the boom cylinder 110. [ More specifically, the boom second-speed control valve 140 controls the neutral position 141 at which the hydraulic fluid of the second pump P2 is prevented from being supplied to the boom cylinder 110 and the hydraulic fluid of the second pump P2, To the boom cylinder (110), and the boom cylinder (110) is selectively converted into the boom cylinder (110) by converting the boom cylinder (110) into the boom cylinder (110).

The boom second-speed control valve 140 includes a pressure-receiving portion 140a connected to the rising signal line 101b of the first operating portion 101. [ The boom second-speed control valve 140 maintains the neutral position 141 and the first operating portion 101 is in the neutral position when the rising signal pressure from the first operating portion 101 is not applied to the pressure receiving portion 140a. The boom second-speed control valve 140 is converted to the conversion position 142 and is supplied to the second pump P2 when the rising signal pressure generated from the second pump P2 is applied to the pressure receiving portion 140a via the rising signal line 101b. To the boom cylinder 110. The boom cylinder 110 has a boom cylinder 110, In this state, all of the hydraulic fluid discharged from the first and second pumps P1 and P2 is supplied to the up side 110a of the boom cylinder 110. [

The arm second speed control valve 160 is connected to the first pump P1 and the other side is connected to the arm cylinder 120 so that the hydraulic fluid discharged from the first pump P1 is selectively supplied to the arm cylinder 120. More specifically, the arm second-speed control valve 160 includes a neutral position 161 for shutting off supply of the operating fluid of the first pump P1 to the arm cylinder 120 and an operating oil of the first pump P1, And is converted into a position of any one of the conversion positions 162 and 163 which is allowed to be supplied to the cylinder 120 to selectively supply the operating fluid of the first pump P1 to the arm cylinder 120. [

The arm second speed control valve 160 includes first and second pressure receiving portions 160a and 160b connected to the rising signal line 102a and the falling signal line 102b of the second operating portion 102, Respectively. The arm second speed control valve 160 maintains the neutral position 161 if the upward and downward signal pressures are not applied to the pressure receiving portions 160a and 160b from the second operating portion 102, When the rising or falling signal pressure generated from the second operating section 102 is applied to either of the pressure receiving sections 160a and 160b through the rising signal line 101b or the falling signal line 102b, The valve 160 is switched to any one of the switching positions 162 and 163 to supply the operating oil discharged from the first pump P1 to the arm cylinder 120. [ In this state, all the hydraulic fluid discharged from the first and second pumps P1 and P2 is supplied to the arm cylinder 120. [

The hydraulic fluid discharged from the first pump P1 is supplied to the boom cylinder 110 via the boom first-speed control valve 130 and the arm second-speed control valve 160, And the operating fluid discharged from the second pump P2 is supplied to the arm cylinder 120 through the arm first control valve 150 and the boom second speed control valve 140, And is distributed and supplied to the boom cylinder 110.

For this reason, when the load applied to the boom 103 and the arm 104 is changed, the flow rate of the hydraulic fluid supplied to the boom cylinder 110 and the arm cylinder 120 varies. Therefore, it is difficult to precisely control the position of the boom 103 and the arm 104, and a work requiring finer position control such as a planarization operation or a crane operation is performed inefficiently.

Further, when a large workload is applied to either the boom 103 or the arm 104, a pressure of the hydraulic fluid discharged from the pump is formed corresponding to the work machine side to which a large work load is applied, The pressure loss occurs in the losing machine, which causes the power loss of the construction machine. For this reason, the operating fluid discharged from each of the pumps P1 and P2 through the separation unit 170 can be separately supplied to two or more working machines. Hereinafter, the separation unit 170 will be described in detail.

The boom second-speed control valve 140 and the arm second-speed control valve 160 (not shown) are controlled according to a signal generated from the separation switch 174, 171, 172, and 173 for controlling the conversion of the signal to be output from the signal processing unit.

The separation switch 174 may be provided inside the cabin for easy operation by the driver, and various known on-off switches may be used.

The signal blocking valves 171, 172, and 173 include first to third signal blocking valves 171, 172, and 173.

The first signal blocking valve 171 is provided on the rising signal line 101b of the first operating portion 101 and the rising signal pressure is applied to the pressure receiving portion 140a of the boom second-speed control valve 140 . The first signal blocking valve 171 is connected to the separation switch 174 so that when the separation switch 174 is turned on, that is, when a separation signal is generated from the separation switch 174, The signal pressure of the up signal line 101b is not applied to the pressure receiving portion 140a of the boom second-speed control valve 140 so as to block the up signal line 101b of the first operating portion 101 . Therefore, the boom second-speed control valve 140 blocks the hydraulic fluid discharged from the second pump P2 from being supplied to the boom cylinder 110, whereby the hydraulic fluid discharged from the second pump P2 is supplied to the boom- So that it can be supplied only to the cylinder 120. On the contrary, when the separation switch 174 is turned off, the pressure receiving portion 140a of the boom second-speed control valve 140 is connected to the rising signal line 101b. Therefore, when a rising signal pressure is applied to the pressure receiving portion 140a from the first operating portion 101 through the rising signal line 101b, the operating fluid discharged from the second pump P2 is supplied to the boom cylinder 110 Side 110a.

The second signal blocking valve 172 is provided on the rising signal line 102a of the second operating portion 102 and is connected to the first pressure receiving portion 160a of the arm second speed control valve 160, Thereby selectively blocking the applied voltage. The second signal blocking valve 172 is connected to the separation switch 174 so that when the separation switch 174 is turned ON, that is, when a separation signal is generated from the separation switch 174, The signal pressure of the rising signal line 101b is applied to the first pressure receiving portion 160a of the arm second speed control valve 160 so as to block the rising signal line 102a of the second operating portion 102, It becomes unauthorized.

The third signal blocking valve 173 is provided on the descending signal line 102b of the second operating portion 102 and is connected to the second pressure receiving portion 160b of the arm second speed control valve 160 by a falling signal pressure Thereby selectively blocking the applied voltage. The third signal blocking valve 173 is connected to the separation switch 174 so that when the separation switch 174 is turned on, that is, when a separation signal is generated from the separation switch 174, The signal pressure of the falling signal line 102b is applied to the second pressure receiving portion 160b of the arm second speed control valve 160 so as to block the rising signal line 102a of the second operating portion 102, It becomes unauthorized.

When the second and third signal blocking valves 172 and 173 block the rising signal line 102a and the falling signal line 102b of the second operation unit 102, The control valve 160 prevents the hydraulic fluid discharged from the first pump P1 from being supplied to the arm cylinder 120 so that the hydraulic fluid discharged from the first pump P1 is supplied to the boom first- To be supplied to the boom cylinder 110 only.

On the other hand, when the separation switch 174 is turned off, the hydraulic pressure receiving portions 160a and 160b of the arm second speed control valve 160 are connected to the rising signal line 102a and the falling signal line 102b, Lt; / RTI > Accordingly, when the signal pressure is inputted from the second operating portion 102 through the rising signal line 102a or the falling signal line 102b, the operating fluid discharged from the second pump P2 is supplied to the arm cylinder 120 .

The separating switch 174 is turned off so that the hydraulic fluid discharged from the first and second pumps P1 and P2 can be supplied to the boom cylinder 110 and the arm cylinder 120 When the separation switch 174 is turned ON and a separation signal is generated, the hydraulic fluid discharged from the first pump P1 is supplied only to the boom cylinder 110, The working oil discharged from the pump P2 can be supplied only to the arm cylinder 120 so that the work requiring fine position control such as the planarization work or the crane work can be efficiently performed and the throttle loss ) Can be reduced.

For example, as shown in FIG. 2, in the case of moving the bucket 105 inward while maintaining the horizontal position, a large work load is applied to the arm cylinder 120, while a small work load is applied to the boom cylinder 110 All. In this case, as shown in Fig. 3, the pressure of the hydraulic fluid of the first pump P1 and the second pump P2 conventionally rises almost the same. However, according to the present embodiment, only the pressure (indicated by a solid line) of the second pump P2 for supplying the operating oil to the arm cylinder 120 is raised and the first pump (Indicated by a dotted line) of the first pressure P1 is almost the same as that at no load. From this, it can be seen that the power loss can be minimized in the present embodiment.

Also, as shown in FIG. 4, a large load is applied to the arm cylinder 120 so that a large amount of hydraulic fluid is supplied to the boom cylinder 110. For this reason, conventionally, in order to supply the required flow rate to the arm cylinder 120, the operating angle of the second operating portion 102, which is the arm operating portion, gradually increases. However, according to the present embodiment, by supplying the operating fluid independently to each of the cylinders 110 and 120 by the pumps P1 and P2, the operating angle of the second operating portion 102, which is the arm operating portion, do. As a result, it is possible to precisely control the position of the boom and the arm.

The same constituent elements as those of the first embodiment among the constituent elements of the second to fourth embodiments described below are given the same reference numerals.

5 is a schematic view of a hydraulic circuit according to a second embodiment of the present invention.

In the second embodiment of the present invention, the control valves 130, 140, 150, and 160 can be electronically controlled. Accordingly, the signal application units 230a, 230b, 240a, 250a, 250b, 260a, 260b of the control valves 130, 140, 150, 160 are constituted by the electron proportional pressure reducing valves The control unit 271 is electrically connected to each of the signal application units 230a, 230b, 240a, 250a, 250b, 260a, and 260b.

The separation unit 270 according to the second embodiment of the present invention includes a separation switch 274 and a control unit 271.

The control unit 271 is connected to each of the signal application units 240a, 260a and 260b of the first and second work control valves 140 and 160 so as to transmit signals. The separation switch 274 When the separation signal is inputted to each of the signal application units 240a and 240b so that the first and second work speeds 140 and 160 are converted into the neutral positions 141 and 161, (260a) and (260b).

On the other hand, when the separation switch 274 is turned off and a confluence signal is input, the control unit 271 controls the first and second operation units 101 and 102 according to a signal applied from the first and second operation units 101 and 102, The conversion signals are input to the signal application units 240a, 260a and 260b of the second-speed control valves 140 and 160 for work.

As described above, even when the control valves 130, 140, 150, and 160 are electronically controlled, the same operational effects as those of the first embodiment of the present invention occur, so that the description thereof will be omitted.

6 and 7 are schematic views of a hydraulic circuit of a construction machine according to a third embodiment of the present invention. Referring to Figs. 6 and 7, in the third embodiment of the present invention, the separation switch 274 of the second embodiment of the present invention is deleted, and is automatically determined by the control unit 371. Fig.

More specifically, the control unit 371 calculates a current working pattern, compares the calculated current working pattern with a predetermined working pattern, and separates the circuit only when they coincide with each other. That is, the separation unit 370 according to the third embodiment of the present invention includes a working pattern generating unit () and a control unit 271. [

The working pattern generating unit 372 includes first and second operating units 372a and 372b. That is, the controller 371 stores a signal input from the first and second operating portions 372a and 372b to the controller 371 for a predetermined time and outputs the stored signals to the first and second operating portions 372a and 372b. (S10) (S20). ≪ / RTI >

Then, the control unit 371 compares the current operation pattern with the predetermined reference operation pattern, and determines whether the current operation pattern matches the reference operation pattern (S30). As a result of the determination, when both working patterns match, the boom second-speed control valve 140 and the arm second-speed control valve 160 are respectively held at the neutral positions 141 and 161 to separate the circuit (S40). On the other hand, when both working patterns do not match, the boom second-speed control valve 140 and the arm second-speed control valve 160 are respectively converted according to the signals inputted from the first and second operating portions 372a and 372b So that the circuits are merged (S50). Here, the term 'circuit separation' means that the hydraulic fluid discharged from each of the pumps P1 and P2 is independently supplied to each of the cylinders 110 and 120, and 'circuit merging' Means that the operating fluid is supplied to the plurality of cylinders 110 and 120.

Meanwhile, the reference work pattern means a work pattern such as a planarization work or a crane work, and a plurality of reference work patterns can be set.

Thus, the convenience of the construction machine can be further increased by determining whether the control unit 371 automatically separates and joins the circuit.

8 is a schematic view of a hydraulic circuit of a construction machine according to a fourth embodiment of the present invention. Referring to FIG. 8, the fourth embodiment of the present invention differs from the third embodiment only in the operation pattern generator 472, and the remaining components are the same.

The working pattern generating unit 472 according to the fourth embodiment of the present invention includes a boom 103 and first to third sensors 472a and 472b for detecting the positions of the arm 104 and the bucket 105, Lt; / RTI > The plurality of sensors 472a, 472b and 472c may be an angle sensor or a gyro sensor for sensing the angle of the boom 103, the arm 104 and the bucket 105, 120) 121 to measure the rod length. That is, the sensors 472a, 472b, and 472c may be various types of sensors as long as they can sense the positions of the boom 103, the arm 104, and the bucket 105, Can be detected.

Information on the positions of the boom 103, the arm 104 and the bucket 105 output from the plurality of sensors 472a, 472b and 472c is inputted to the control unit 471, and the control unit 471 After storing the information about each position for a predetermined time, a current operation pattern is calculated from the information.

Since the control process is the same as the third embodiment of the present invention, a detailed description thereof will be omitted. In the present embodiment, three sensors 472a, 472b and 472c are exemplified. However, unlike the present embodiment, the sensors 472a, 472b and 472c are not limited to the three sensors 472a, 472b and 472c, 1 sensor 472a and a second sensor 472b for sensing the position of the arm 104. [

1 is a schematic view of a hydraulic circuit of a construction machine according to a first embodiment of the present invention,

FIG. 2 is a schematic view illustrating a process of planarizing the bucket,

3 is a graph schematically showing changes in the operating oil pressure of the first and second pumps occurring in the planarization work process shown in FIG. 2 for comparing the conventional construction machine hydraulic circuit and the hydraulic circuit of the first embodiment,

FIG. 4 is a graph schematically showing the operating angles of the first and second operating portions generated in the planarization work process shown in FIG. 2 to compare the conventional construction machine hydraulic circuit and the hydraulic circuit of the first embodiment,

5 is a schematic view of a hydraulic circuit of a construction machine according to a second embodiment of the present invention,

6 is a schematic view of a hydraulic circuit of a construction machine according to a third embodiment of the present invention,

FIG. 7 is a flowchart for explaining the operation of the hydraulic circuit of the construction machine shown in FIG. 6;

8 is a schematic view of a hydraulic circuit of a construction machine according to a fourth embodiment of the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS OF THE DRAWINGS

P1, P2; First and second pumps 110 and 120; The first and second working machines

130; 1-speed control valve for first work, boom 1-speed control valve

140; Second work speed control valve, boom second speed control valve

150; 1 < st > speed control valve for second work, arm 1 speed control valve

160; Second work speed control valve, arm second speed control valve

170, 270, 370, 470; Separation unit 174, 274; Separation switch

171, 172, 173; The first to third signal blocking valves

271, 371, 471; Controls 372 and 472; The work pattern generator

Claims (6)

A first working first speed control valve (130) for controlling the flow direction of the working oil discharged from the first pump (P1) and supplying it to the first working machine (110); A second working first speed control valve (150) for controlling the flow direction of the hydraulic fluid discharged from the second pump (P2) and supplying the same to the second working machine (120); A converting position 142 for converting the operating oil discharged from the second pump P2 into the working oil discharged from the first pump P1 and supplied to the first working machine 110, A first working second-speed control valve (140) having a neutral position (141) for supplying only the working oil discharged from the first pump (P1); A conversion position 162 or 163 for allowing the hydraulic fluid discharged from the first pump P1 to be discharged from the second pump P2 and merging with the hydraulic fluid supplied to the second working machine 120, 120) includes a second working second-speed control valve (160) having a neutral position (161) for supplying only the operating oil discharged from the second pump (P2); And A separation unit 170 (270) for switching the first and second work-use second-speed control valves 140, 160 to the neutral position 141, 161 or the conversion positions 142, 162, 163 370) < / RTI > (470). The apparatus of claim 1, wherein the separation unit (170) A separation switch 174 for generating the separation signal; And First and second operating portions 101 and 102 for generating signal pressures for driving the first and second working machines 110 and 120 and the first and second working second-speed control valves 140 and 140 102a and 102b that connect the respective pressure receiving portions 140a, 160a and 160b of the respective signal lines 160a and 160a to the respective signal lines 101a, 102a, and 102b, 172 and 173 for selectively applying or interrupting the signal pressure of each of the pressure receiving portions 140a, 160a, and 160b to the pressure receiving portions 140a, 160a, Hydraulic circuit of a construction machine. The apparatus of claim 1, wherein the separation unit (270) A separation switch 274 for generating the separation signal; And And is connected to each of the signal application units 240a, 260a and 260b of the first and second work speed control valves 140 and 160 for signal transmission, So that the first and second working second-speed control valves 140 and 160 are switched to the neutral position 141 or 161 or the switching positions 142, 162, and 163, And a control unit (271) for applying or interrupting a signal to the hydraulic pumps (260a, 260b). The apparatus of claim 1, wherein the separation unit (370) (470) A working pattern signal generating unit 372 (472) for generating a signal for a working pattern of the first and second working machines (110) and (120); And The work pattern signal generator 372 (472) is connected to each of the signal application units 240a, 260a and 260b of the first and second work control valves 140 and 160 for signal transmission, And if the current operation pattern matches the predetermined reference operation pattern, if the current operation pattern matches the predetermined reference operation pattern, the first and second operation modes A control unit 371 for applying a signal to each of the signal applying units 240a, 260a and 260b so that each of the second speed control valves 140 and 160 is converted into the neutral position 141 and 161, And the hydraulic circuit of the construction machine. 5. The method of claim 4, The operation pattern signal generating unit 372 includes first and second operation units 372a and 372b for generating signals for driving the first and second work machines 110 and 120, Wherein the control unit (371) calculates the current operation pattern from the signals generated from the first and second operation units (372a, 372b). 5. The method of claim 4, The first working machine 110 is a boom cylinder 110 for driving the boom 103 and the second working machine 120 is an arm cylinder 120 for driving the arm 104, The operation pattern signal generating unit 472 generates the operation pattern signal, A first sensor 472a for sensing the position of the boom 103; And And a second sensor 472b for sensing the position of the arm 104, Wherein the control unit (471) calculates a current operation pattern from information on the position of the boom (103) and the arm (104).

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