KR20110073899A - Pump control actuation system of construction machinery - Google Patents

Abstract

PURPOSE: A pump control/operation system of construction machinery is provided to simplify a power transfer system between an engine and an actuator and enable power to be transferred to reduce the power loss of the engine by a hydraulic element since the actuator and a pump are installed to correspond one to one. CONSTITUTION: A pump control/operation system of construction machinery comprises an operating pump(100), an auxiliary control valve(C) and a supply pump(105). The operating pump supplies oil, one to one, to an actuator, which shows high frequency of operation and consumes a lot of energy. The auxiliary control valve distributes oil to another actuator, which shows relatively low frequency of operation. The supply pump supplies oil to the auxiliary control valve.

Description

Pump Control Actuation System of Construction Machinery

The present invention relates to a pump control operating system of construction equipment, and more particularly to a pump control operating system of construction equipment equipped with a corresponding pump of each actuator.

In general, construction machinery is driven using hydraulic pressure. Hydraulic pressure is supplied from one or more hydraulic pumps operated by the engine. The hydraulic pump pressurizes the working oil and supplies it to each actuator. The working oil is distributed properly to each actuator via a distributor called the main control valve.

The output of the engine is lost as the operating oil, such as pumps, pipelines, valves and main control valves, passes through hydraulic components to drive the hydraulic pressure. Actuators operate at approximately 20% efficiency at engine power.

Recently, in order to increase the efficiency of the hydraulic system with respect to the output of the engine, a pump control system having a pump for supplying operating oil corresponding to each actuator has been studied.

The pump control system is a pump driven by the engine to supply the operating oil directly to each actuator, a system that reduces the hydraulic friction losses by reducing the hydraulic elements that pass or control the operating oil. The pump control system provides high engine efficiency by eliminating losses in the main control valve that distributes the operating oil. In addition, the actuator is easy to control the output by adjusting the supply amount of the operating oil by the pump.

As such, an overview of the technology of the pump control system is known, but there is a problem in that a load difference occurs between each actuator driven by each pump, and when a pump is overloaded, the flow rate of the operating oil supplied to the pump is insufficient. .

The present invention has been made to solve the above-described problems of the prior art, construction to reduce the energy loss for the actuator in the engine to increase the energy efficiency of the engine, and to flexibly adjust the supply amount of the operating oil according to the load of the actuator It is to provide the pump control operation system of the equipment.

The pump control operation system of construction equipment according to the present invention is applied to a hydraulic system including a plurality of actuators, such as an excavator, and the operation oil is 1: 1 to some of the actuators with high working frequency and high energy consumption among the actuators. A plurality of movable pumps for supplying, and an auxiliary control valve for distributing operating oil to a plurality of other actuators having a relatively low frequency of operation among the plurality of actuators; And a supply pump supplying operating oil to the auxiliary control valve.

Here, the actuators corresponding to the plurality of movable pumps in a 1: 1 ratio are boom cylinders, arm cylinders, and swing motors, and actuators connected to the auxiliary control valves are driving motors, bucket cylinders, and options.

As another example, the pump control operation system of the construction equipment according to the present invention is applied to a hydraulic system including a plurality of actuators, such as an excavator, a plurality of 1: 1 corresponding to the actuator to supply the operating oil to the actuator And a clutch for transmitting or blocking the power of the engine to the movable pump.

Herein, the actuator sets the boom cylinder, the arm cylinder, the bucket cylinder and the swing motor to one group, the option to one group, and the driving motor to one group, and the clutch controls the power of the engine for each group. It can be installed one for each group.

In addition, as applied to a hydraulic system including a plurality of actuators, such as an excavator, a plurality of movable pumps for supplying the operating oil to the actuator in a one-to-one correspondence with the actuator, and for the driving motor and options of the actuator It includes a clutch that regulates engine power.

In this case, a clutch is provided for each group to control the power in one group and the driving motor in one group.

In the pump control operation system of construction equipment according to the present invention as described above, the actuator and the pump correspond to 1: 1 so that the power transmission system between the engine and the actuator is simplified, and the power loss of the engine by the hydraulic element is low. Power is delivered to the low-actuator to increase the efficiency of the engine's energy.

In addition, by installing a clutch in the power transmission system transmitted from the engine to the pump, the power transmitted to the pump can be interrupted, and the power of the engine is unnecessarily wasted by stopping the operation of the pump supplying the operating oil to the stopped actuator. The state can be prevented.

In addition, frequently used and not used groups of actuators are used. Frequently used booms, arms, buckets, and swings are directly connected to the engine and pumps. By installing a clutch to control the power of the engine, energy loss due to pump operation can be reduced.

Hereinafter, a preferred embodiment of a pump control operation system of construction equipment according to the present invention will be described with reference to the accompanying drawings. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator.

1 is a configuration diagram of a pump control operation system of construction equipment according to an embodiment of the present invention, Figure 2 is a configuration diagram of a 1: 1 pump system of the pump control operation system of construction equipment according to an embodiment of the present invention. 3 is a block diagram of an auxiliary control valve system using two supply pumps of a pump control operation system of construction equipment according to an embodiment of the present invention, Figure 4 is a construction of a construction equipment according to an embodiment of the present invention This is a schematic diagram of an auxiliary control valve system using a single supply pump of a pump control operation system.

Referring to Figure 1, the pump control operation system of construction equipment according to an embodiment of the present invention is applied to a hydraulic system including a plurality of actuators, such as an excavator, the power of the engine (E) of each pump (P It is configured to be delivered to some actuator A1 through). In the present embodiment, there is an actuator A1 that receives power in correspondence with the pump P in a 1: 1 manner, while the actuator A2 that is powered by an auxiliary control valve C for distributing working oil is also present. Consists of.

The connection of the engine E and the respective pumps P can use various methods. Each pump P may be connected in series to the output shaft of the engine E, and although not shown, each pump P may be connected in parallel using a separate power distribution device. When the pump P is divided into a pump group requiring standby driving and a pump group requiring no standby driving, the above-described series connection and parallel connection may be mixed and used. In this embodiment, an engine is used as the power source of the respective pumps, but an electric motor can be used as the power source, and in this case, it is also possible to distribute power to the respective pumps properly through the power distribution device. Of course it is possible.

Here, a plurality of pumps (P) for supplying the operation oil 1: 1 to some of the actuators A1 having high working frequency and high energy consumption among the actuators A1 and A2 are used as the movable pump 100. The pump P for supplying the operation oil to the plurality of other actuators A2 having a relatively low work frequency among the plurality of actuators A1 and A2 is a supply pump 105. The auxiliary control valve C performs a function of properly distributing the operating oil supplied from one or a plurality of pumps to a plurality of actuators according to the load, like a known main control valve of a construction machine.

As a construction machine, for example, an actuator corresponding to a plurality of movable pumps 100 in a 1: 1 manner as shown in FIG. 2 may be a boom cylinder 110, an arm cylinder 115, and a swing motor 120. 3, the actuator connected to the auxiliary control valve C may be the driving motor 125, the bucket cylinder 130, and the option 135. That is, excavators are frequently used booms, arms and swings during operation, driving, buckets and options depending on the needs of the operation.

2 shows a hydraulic circuit to which the movable pump 100 is applied as a bidirectional pump to the boom, the arm and the swing, respectively. The boom cylinder 110, the arm cylinder 115 and the swing motor 120 are each connected to the movable pump 100 is configured with a hydraulic line to receive the operating oil.

Each of the movable pump 100 and the corresponding hydraulic device is preferably configured as a closed circuit as shown in FIG. However, such a closed circuit hydraulic system is generally configured to relief the hydraulic fluid through a separate relief valve 121 in consideration of the safety of the system when the working pressure of the work device is greater than a certain amount.

This reduces the flow rate inside the closed circuit, so there is a need for additional aids to replenish the reduced flow rate for future power system stability. To this end, the present embodiment further includes a separate flow replenishment line 122 connected to each of the movable pumps 100 and a flow replenishment pump 123 for replenishing the flow rate to the flow replenishment line 122.

The hydraulic oil supplied to the flow replenishment line 122 may overcome the elasticity of the shuttle valve 124 when the flow rate is insufficient in the movable pumps P, and may be supplied to the movable pumps P, respectively. However, the above-described flow loss does not occur continuously during the operation of the equipment. In this embodiment, all of the movable pumps 100 are connected to one flow refill line 122 in consideration of this, thereby simplifying the flow replenishment problem.

In FIG. 3, the bucket cylinder, the traveling motor 125, and the option 135 are configured to operate by two supply pumps 105. The supply pump 105 supplies the operation oil to the bucket cylinder 130, the traveling motor 125 and the option 135 by a plurality of control valves constituting the auxiliary control valve (C). The operation of the auxiliary control valve C to distribute the operating oil to the bucket cylinder 130, the traveling motor 125 and the option 135 can be known from the known main control valve (MCV) of construction machinery. . The auxiliary control valve C can be configured with a hydraulic circuit from a known technique according to the type, design specification and purpose of the actuator used.

4 shows a configuration in which one supply pump 105 is connected to the auxiliary control valve C. As shown in FIG. 4 shows a hydraulic circuit in which the supply pump 105 is composed of one and connected to the auxiliary control valve (C). Similarly, the auxiliary control valve C of FIG. 4 is also a hydraulic circuit to which a plurality of control valves can be known from the main control valve of the known excavator.

The above embodiment is a hydraulic system combining a 1: 1 pump system in which some of the actuators correspond to the pump P 1: 1, and an auxiliary control valve system for driving the remaining actuators by the auxiliary control valve C. . The 1: 1 pump system and auxiliary control valve system can be combined in various ways depending on the purpose of the construction machine.

In other words, the actuators frequently used to increase the energy efficiency of the engine (E) apply a 1: 1 pump system to simplify the power transmission system, thereby minimizing the energy loss of the hydraulic elements, and the less used actuators are auxiliary controls. By applying a valve system, it is possible to selectively power the required actuator to increase the efficiency of power transmission.

5 is a configuration diagram in which the clutch 140 of the pump control operation system of construction equipment according to an embodiment of the present invention is used, and FIG. 6 is a pump control of construction equipment according to an embodiment of the present invention as shown in FIG. 5. The clutch 140 is used for each group of operating systems.

Referring to Figure 5, the pump control operation system of the construction equipment according to the present invention is applied to a hydraulic system including a plurality of actuators, such as an excavator, a plurality of 1: 1 corresponding to the actuator to supply the operating oil to the actuator Movable pump 100, a supply pump 105 for supplying operating oil to a plurality of actuators, a power distribution device and a power distribution device for distributing power of the engine as a power source in parallel to each of the movable pump and the supply pumps It is installed between the pump includes a clutch 140 for intermittent power of the engine. On the other hand, in the case of a flow supplement pump that supplements the flow rate to the plurality of movable pumps (100) is not shown, but there is a necessity of constant operation is connected to the engine in series with the power distribution unit, or to any one output shaft of the power distribution unit It is preferred to be connected.

Power of the engine E is transmitted to the movable pump 100 through the clutch 140 installed in each movable pump 100. Since the power of the engine E is continuously transmitted to each of the movable pumps 100 before the clutch 140 is installed, when the driving of the actuator corresponding to the movable pump 100 is stopped, the movable pump 100 is stopped. ) Is a loss of energy. It is possible to reduce the load of the engine E by interrupting the power transmission to the movable pump 100 corresponding to the actuator that has stopped operation by the clutch 140. The clutch 140 is a power transmission element that is directly installed in the movable pump 100 to regulate power transmission for the movable pump 100.

In the above embodiment, the power system applied to the hydraulic system according to an embodiment of the present invention has been described. However, the present invention is not limited only to these embodiments, and may be modified in various ways in order to consider unnecessary waste of power.

Referring to FIG. 6, in the case of an excavator, the actuator includes one group of boom cylinders 110, an arm cylinder 115, a bucket cylinder 130, and a swing motor 120, and one group of options 135 and traveling. The motors 125 can be set in one group, and the clutches 141, 142, 143 can be installed one in each group to control the power of the engine E for each group. Each movable pump 100 corresponding to the boom cylinder 110, the arm cylinder 115, the bucket cylinder 130, and the swing motor 120 in a one-to-one manner is connected to the engine E by one clutch 141. ) Power is interrupted. The clutches 142 and 143 are separately installed in the option 135 and the driving motor 125 to control power transmission to the option 135 and the driving motor 125, respectively.

7 is a configuration diagram in which the clutch 140 is used for the option 135 and the driving motor 125 of the pump control operation system of the construction equipment according to an embodiment of the present invention.

Referring to FIG. 7, in the case of an excavator, a hydraulic system including a plurality of actuators is applied, and a plurality of movable pumps 100 correspond to the actuators in a 1: 1 ratio to supply the operating oil to the actuators. Clutches 142 and 143 for controlling the engine E power are provided for the traveling motor 125 and the option 135 of the actuator. In this case, the option 135 may be set in one group and the driving motor 125 in one group, and the clutches 142 and 143 may be installed in groups so as to control power.

That is, the boom, the arm, the bucket, and the swing maintain the standby state supplied with the operating oil by each of the movable pumps 100 receiving power from the engine E, and the option 135 and the driving motor 125. The actuator, which is not frequently operated and is operated only when necessary, may be controlled by the clutches 142 and 143 to reduce the power loss of the engine E by controlling the power of the engine E. FIG.

1 is a block diagram of a pump control operation system of construction equipment according to an embodiment of the present invention.

Figure 2 is a block diagram of a 1: 1 pump system of the pump control operating system of construction equipment according to an embodiment of the present invention.

3 is a block diagram of an auxiliary control valve system using two supply pumps of the pump control operation system of construction equipment according to an embodiment of the present invention.

Figure 4 is a block diagram of an auxiliary control valve system using a single supply pump of the pump control operation system of construction equipment according to an embodiment of the present invention.

5 is a configuration diagram used in the clutch of the pump control operating system of construction equipment according to an embodiment of the present invention.

FIG. 6 is a configuration diagram in which a clutch is used for each group of a pump control operation system of construction equipment according to an embodiment of the present invention as shown in FIG. 5.

7 is a configuration diagram in which the clutch is used for the driving motor and the option of the pump control operation system of the construction equipment according to an embodiment of the present invention.

<Explanation of symbols on main parts of the drawings>

E: engine P: pump

A1, A2: Actuator C: Auxiliary control valve

100: operation pump 105: supply pump

110: boom cylinder 115: arm cylinder

120: swing motor 121: relief valve

122: shuttle valve 123: hydraulic filler pump

124: hydraulic refill line 125: driving motor

130: bucket cylinder 135: optional

140: clutch

Claims (5)

As applied to a hydraulic system including a plurality of actuators, such as an excavator, a plurality of movable pumps (100) for supplying the operation oil 1: 1 to some of the high frequency and high energy consumption of the actuator; An auxiliary control valve (C) for distributing operating oil to a plurality of other actuators having a relatively low frequency of operation among the plurality of actuators; And Pump control operation system of construction equipment comprising a supply pump 105 for supplying operating oil to the auxiliary control valve (C). The method of claim 1, Actuators of the excavator include a boom cylinder 110, arm cylinder 115, swing motor 120, traveling motor 125, bucket cylinder 130 and option 135, The plurality of movable pumps 100 includes at least the movable pump for the boom cylinder and the movable pump for the arm cylinder, The auxiliary control valve (C) is pump control operation system of the construction equipment, characterized in that it is connected to the remaining actuators that are not connected to the movable pumps. The method according to claim 1 or 2, Each of the movable pumps and the actuators corresponding to the respective movable pumps is composed of an independent hydraulic system in the form of a closed loop, And a flow replenishment pump for replenishing the flow rate to each of the independent hydraulic systems, and a flow replenishment line for connecting the hydraulic oil supplied from the flow replenishment pump to each of the independent hydraulic systems. . The method of claim 3, wherein Only one flow supplement pump is provided, and each of the movable pumps is connected to the flow supplement line in parallel. The method according to claim 1 or 2, A power distribution device for connecting the respective movable pumps and the supply pump to the power source of the excavator in parallel; And And a clutch disposed between each of the power distribution device and the pumps to selectively shut off the power of the power source when the pumps are not driven.

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