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Work machine

A technology for working machines and working machines, which is applied to mechanical equipment, mechanically driven excavators/dredgers, earthmovers/shovels, etc., and can solve the problem of increased moment of inertia, increased discharge pressure of hydraulic pumps, flow loss, etc. problem, to achieve the effect of energy efficiency and operability

Active Publication Date: 2018-11-09
HITACHI CONSTRUCTION MACHINERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the moment of inertia of the revolving body including the working machine and its load increases, for example, when the discharge pressure of the hydraulic pump rises at the start of revolving, a part of the hydraulic oil is discharged to the working oil tank through the relief valve, resulting in In case of traffic loss

Method used

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Experimental program
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Effect test

no. 1 Embodiment approach ＞

[0029] (1-1) Operating machinery

[0030] figure 1 It is a perspective view showing an appearance configuration of a hydraulic excavator as an example of a work machine according to each embodiment of the present invention. In the following instructions, unless otherwise specified, the front of the driver's seat ( figure 1 Middle left) is the front of the body. However, the example of the hydraulic excavator is not intended to limit the applicable object of the present invention, as long as it is a working machine having a revolving body that turns with respect to the base structure, the present invention can also be applied to other types of working machines such as cranes.

[0031] The illustrated hydraulic excavator includes a running body 1 , a revolving body 2 provided on the running body 1 , and a working machine (front working machine) 3 attached to the revolving body 2 . The running body 1 is a base structure of a work machine, and is a crawler traction type running...

no. 2 Embodiment approach ＞

[0097] (2-1) Composition

[0098] Figure 7 It is a schematic diagram of the pump controller concerning 2nd Embodiment of this invention. exist Figure 7 In the drawings, the same reference numerals as those in the conventional drawings are assigned to the same elements as those in the first embodiment. The command flow calculation unit 56A of the pump controller 47A of the present embodiment is different from the command flow calculation unit 56 of the pump controller 47 of the first embodiment. The difference between the configuration of the present embodiment and the first embodiment is only in this point, so description of other configurations will be omitted, and the command flow calculation unit 56A will be described below.

[0099] ·Command flow calculation unit

[0100] The command flow calculation unit 56A in the present embodiment includes an operation time calculation unit 66 , a delay time calculation unit 67 , a target flow rate calculation unit 68 , and a minim...

no. 3 Embodiment approach ＞

[0116] (3-1) Composition

[0117] Figure 9 It is a schematic diagram of the pump controller concerning 3rd Embodiment of this invention. exist Figure 9 In the drawings, the same reference numerals as those in the conventional drawings are assigned to the same elements as those in the first or second embodiment. In the present embodiment, the flow rate increase rate calculation unit 55B and the command flow rate calculation unit 56B of the pump controller 47B are different from the flow rate increase rate calculation unit 55 and the command flow rate calculation unit 56 of the pump controller 47 of the first embodiment. The difference between the configuration of the present embodiment and the first embodiment is only in this point, so the description of other configurations is omitted, and the flow rate increase rate calculation unit 55B and the command flow rate calculation unit 56B will be described below.

[0118] ·Flow rate increase rate calculation unit

[0119] The...

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Abstract

In order to control the increase rate of a pump discharge flow rate for a turning action in response to a moment of inertia and an operation amount, and to achieve both energy efficiency and operability with respect to the turning action, this work machine is provided with: a turning body 2 provided on an upper part of a traveling body 1; a work implement 3 attached to the turning body 2; a turning motor 16; a hydraulic pump 22; a regulator 24; a directional control valve 31; and an operation device 34, wherein the work machine is further provided with: a target maximum flow rate computing unit 53 for computing a target maximum flow rate Qmax of the pump in response to a turning operation amount Ps; a flow rate increase rate computing unit 55 for computing an increase rate dQ of a commandflow rate of the hydraulic pump 22 on the basis of the moments of inertia N and the turning operation amounts Ps of the turning body 2 and the work implement 3; a command flow rate computing unit 56 for computing a command flow rate Q(t) on the basis of the increase rate dQ when considering the target maximum flow rate Qmax as an upper limit; and an output unit 57 for outputting a command signal Sf to the regulator 24 in response to the command flow rate Q(t).

Description

technical field [0001] The present invention relates to working machines such as hydraulic excavators, and more particularly to working machines that perform pump flow rate control (capacity control) with respect to swinging motion. Background technique [0002] In working machines such as hydraulic excavators, there is a configuration in which a revolving body turns with respect to a base structure such as a running body. Various equipment such as working machines, prime movers, hydraulic pumps, various tanks, heat exchangers, electrical equipment, and cabs are installed on the revolving body. In addition, the weight of the excavated load such as a large amount of earth and sand is applied to the working machine. Therefore, the moment of inertia of the revolving body including the working machine and its load increases, for example, when the discharge pressure of the hydraulic pump rises at the start of revolving, a part of the hydraulic oil is discharged to the working oi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02F9/22E02F9/20
CPCE02F9/2292E02F9/2296E02F9/123E02F9/2235F15B2211/20546F15B2211/6652F15B2211/6654F15B2211/7058E02F9/121E02F9/2025E02F9/2221E02F9/2267E02F3/32E02F9/2004E02F9/2285
Inventor 森川雅俊井村进也西川真司
Owner HITACHI CONSTRUCTION MACHINERY CO LTD
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