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KR-102963576-B1 - CONSTRUCTION MACHINE AND METHOD FOR CONTROLLING THE SAME

KR102963576B1KR 102963576 B1KR102963576 B1KR 102963576B1KR-102963576-B1

Abstract

An embodiment of the present invention relates to a construction machine comprising a main pump, a main control valve that operates by receiving hydraulic fluid from the main pump, a hydraulic device that operates by the hydraulic fluid of the main control valve, and a gear pump that provides pilot hydraulic fluid to the main control valve, the construction machine comprises a main control electronic control valve disposed between the main control valve and the gear pump and operated by receiving a pilot signal for operation, and a control unit that operates the main control electronic control valve to remove residual pressure of the hydraulic device when residual pressure exists in the hydraulic device.

Inventors

  • 김태윤
  • 박준홍

Assignees

  • 에이치디현대인프라코어 주식회사

Dates

Publication Date
20260511
Application Date
20201008

Claims (12)

  1. A construction machine comprising a main pump, a main control valve that operates by receiving hydraulic fluid from the main pump, a hydraulic device that operates by the hydraulic fluid of the main control valve, and a gear pump that provides pilot hydraulic fluid for the operation of the main control valve, A main control electronic control valve positioned between the main control valve and the gear pump, which operates by receiving a pilot signal for operation; An input unit that receives residual pressure removal operation information of the above hydraulic device; A control unit that receives an operation information signal from the input unit when the engine is in the ignition state, and operates the main control electronic control valve to remove the residual pressure of the hydraulic device when residual pressure exists in the hydraulic device; A safety lever valve that is selectively controlled by the above-mentioned control unit and, when the control unit receives an operation information signal from the input unit, transmits the pilot hydraulic fluid of the gear pump for the operation of the main control electronic control valve; and It includes an accumulator disposed between the safety lever valve and the gear pump, capable of storing hydraulic fluid of the gear pump and supplying pilot hydraulic fluid for the operation of the main control valve. A sensor attached to an attachment; and It further includes a detection member for detecting pilot pressure supplied to the main control valve, and The above control unit is, A construction machine characterized by checking whether the position is preset based on the sensor information above to remove residual pressure of the hydraulic device, comparing the pilot pressure detected by the detection member with the preset reference pressure to determine the completion time of the residual pressure removal operation, and turning off the engine of the construction machine.
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  3. In paragraph 1, It further includes a detection member that detects the pilot pressure supplied to the main control valve and transmits it to the control unit. The above control unit is, A construction machine characterized by being able to determine the completion time of the residual pressure removal operation of the hydraulic device based on the pilot pressure detected by the detection member.
  4. A construction machine comprising a main pump, a main control valve that operates by receiving hydraulic fluid from the main pump, a hydraulic device that operates by the hydraulic fluid of the main control valve, and a gear pump that provides pilot hydraulic fluid for the operation of the main control valve, A main control electronic control valve that operates by receiving a pilot signal and is positioned between the main control valve and the gear pump; An input unit that receives residual pressure removal operation information of the above hydraulic device; A control unit that receives an operation information signal from the input unit when the engine is in the ignition state, controls the hydraulic fluid discharged by the main pump to be reduced, and operates the main control bypass valve and the main control electronic control valve to remove residual pressure of the hydraulic device; A safety lever valve that is selectively controlled by the above-mentioned control unit and, when the control unit receives an operation information signal from the input unit, transmits the pilot hydraulic fluid of the gear pump for the operation of the main control electronic control valve; and It includes an accumulator disposed between the safety lever valve and the gear pump, capable of storing hydraulic fluid of the gear pump and supplying pilot hydraulic fluid for the operation of the main control valve. A sensor attached to an attachment; and It further includes a detection member that detects the pilot pressure supplied to the main control valve and transmits it to the control unit. The above control unit is, A construction machine characterized by checking whether the position is preset based on the above sensor information, removing the residual pressure of the above hydraulic device, determining the time when the operation to remove the residual pressure of the above hydraulic device is completed based on the pilot pressure detected by the detection member, and turning off the engine of the above construction machine when the operation to remove the residual pressure of the above hydraulic device is determined.
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  7. In paragraph 1 or 4, A construction machine further comprising a display unit that outputs operation information of the above-mentioned control unit to the operator.
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  9. A step of receiving a command to remove residual pressure from the hydraulic device of the construction machine while the engine of the construction machine is in the ignition state; A step of determining whether the above construction machine maintains a preset posture; When the above residual pressure removal instruction is received, if it is determined that the construction machine maintains a preset posture, a step of removing the residual pressure of the hydraulic device by controlling the main control electronic control valve to adjust the pilot pressure supplied from the gear pump for the operation of the main control valve connected to the hydraulic device, thereby causing the displacement of the main control valve to change at a constant period; A step of detecting the pilot pressure of a main control valve connected to the hydraulic device and determining whether the residual pressure removal operation of the hydraulic device is completed; and Step of turning off the engine of the construction machine when the residual pressure removal operation of the above hydraulic device is completed. A control method for construction machinery including
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Description

Construction Machine and Method for Controlling the Same Embodiments of the present invention relate to a construction machine and a method for controlling the same, and more specifically, to a construction machine and a method for controlling the same that can prevent hydraulic fluid from being sprayed onto the operator due to residual pressure when replacing attachments, etc. of the construction machine. Generally, attachments on construction machinery can be replaced depending on the work area and type of work. These attachments are connected to hydraulic lines for their operation, and the attachments can be replaced by removing them from these lines. Specifically, there is a problem in that when a plug is loosened or a hose is disconnected, high-pressure hydraulic fluid is sprayed toward the operator due to residual pressure, causing accidents such as blindness. In other words, if residual pressure with high energy exceeding a certain amount exists within a specific region inside the hydraulic equipment used for the operation of hydraulic lines and attachments, there is a problem where hydraulic fluid is sprayed outward due to this pressure. Therefore, a system is required to prevent accidents in which workers are injured by residual internal pressure during the replacement of construction machinery attachments or the maintenance of hydraulic lines and equipment. FIG. 1 shows a construction machine according to one embodiment of the present invention. FIG. 2 shows a configuration diagram for controlling a construction machine according to one embodiment of the present invention. FIG. 3 shows a hydraulic circuit diagram of a construction machine according to one embodiment of the present invention. Figure 4 shows the operation process of the main control electronic control valve in one embodiment of the residual pressure removal process. Figure 5 shows the operation process of the main control electronic control valve of another embodiment of the residual pressure removal process. Figure 6 shows a graph of pressure over time when the boom is lowered during the residual pressure removal process of a construction machine according to one embodiment of the present invention. FIG. 7 shows a flowchart of a construction machine control method according to one embodiment of the present invention. FIG. 8 shows a flowchart of a construction machine control method according to another embodiment of the present invention. Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein. It should be noted that the drawings are schematic and not drawn to scale. The relative dimensions and proportions of parts in the drawings are exaggerated or reduced in size for clarity and convenience, and any dimensions are merely illustrative and not limiting. Additionally, the same reference numerals are used to denote similar features for identical structural elements or parts appearing in two or more drawings. The embodiments of the present invention specifically illustrate ideal embodiments of the present invention. As a result, various variations of the illustration are expected. Accordingly, the embodiments are not limited to the specific form of the illustrated area and include, for example, variations in form resulting from manufacturing. Hereinafter, a construction machine (101) according to one embodiment of the present invention will be described with reference to FIGS. 1 to 7. As shown in FIG. 1, the construction machine (101) includes a boom (12), an arm (13), an attachment (14), an upper body (25), a lower body (26), a slewing device (15), and a driving device (16). A space where a driver can ride, such as a cabin, is installed in the upper body (25). In addition, mechanical equipment such as an engine (50) is installed in the upper body (25). The lower body (26) supports the upper body (25) and enables the construction machine (101) to travel. Specifically, the driving device (16) is operated to enable the construction machine (101) to travel. A pivoting device (15) is installed between the upper body (25) and the lower body (26) to support the upper body (25) so that it rotates around the lower body (26). A boom (12) is rotatably supported on the upper body (25). Additionally, an arm (13) is rotatably supported on the boom (12). Furthermore, an attachment (14), such as a bucket, is mounted on one side of the arm (13). The boom (12), arm (13), and attachment (14) are operated by supplying hydraulic fluid. Additionally, the construction machine (101) includes a main pump (10), a main control valve (20), a hydraulic device (30), and a gear pump (40), as shown in FIGS. 2 and 3. The main pump (10) receives power from the engine and generates hydraulic fluid. The main contr