KR-102962449-B1 - PRESSURE SELECTOR AND HYDRAULIC CONTROLLER

KR102962449B1KR 102962449 B1KR102962449 B1KR 102962449B1KR-102962449-B1

Abstract

The pressure selection device of the present invention comprises an electronic proportional valve that outputs a proportional valve pressure based on an input operating pressure, and a selection unit that selects the higher pressure between the operating pressure and the proportional valve pressure and outputs the selected pressure.

Inventors

가츠마타 료타

Assignees

콤테스코 주식회사

Dates

Publication Date: 20260511
Application Date: 20200220
Priority Date: 20190405

Claims (10)

An electronic proportional valve that outputs a proportional valve pressure based on an electrical signal of the input operating pressure, and Between the first initial operation and the second initial operation of the pressure selection device, the higher pressure between the operating pressure and the proportional valve pressure is selected, and immediately after the operation of the pressure selection device stops, the pressure of the operating pressure is selected, and the selection unit outputs the selected pressure. A pressure selection device equipped with
An electronic proportional valve that outputs a proportional valve pressure based on an electrical signal of the input operating pressure, and Equipped with a selection section, The above selection unit is, Based on the higher of the value obtained by adding a correction pressure to the above operating pressure and the above proportional valve pressure, either the above operating pressure or the above proportional valve pressure is selected, and the selected pressure is output. A pressure selection device that outputs the pressure of the operating pressure immediately after the operation of the pressure selection device is stopped.
In paragraph 1 or 2, A pressure selection device that outputs the selected pressure to a hydraulic control valve driving a hydraulic actuator.
In paragraph 1 or 2, The above selection unit is a pressure selection device having a switching valve that switches between the operating pressure and the proportional valve pressure.
In paragraph 4, The above switching valve is, A spool moving along one direction, and A pressure chamber provided at the first end of the unidirectional portion of the above spool, wherein the pressure applied to the first end is input, and A proportional valve pressure chamber provided at the second end, which is on the opposite side of the first end of the spool in the same direction, and into which the proportional valve pressure is input to the second end, and A spring that presses the first end of the spool toward the second end, and An output port that outputs the higher of the pressure input to the first end and the pressure input to the second end, and A pressure input port connected to the output port when the pressure input to the first end is higher than the pressure input to the second end, and A proportional valve pressure input port connected to the output port when the pressure input to the second end is higher than the pressure input to the first end, and A tank port connecting the operating pressure chamber and the tank in the case where the pressure input to the second end is higher than the pressure input to the first end. Pressure selection device having
In paragraph 5, The above selection unit is a pressure selection device having another switching valve that inputs the proportional valve pressure to the proportional valve pressure chamber and the proportional valve pressure input port by inputting the above operating pressure.
An electronic proportional valve that outputs proportional valve pressure based on input operating pressure, and A spool moving along one direction; an operating pressure chamber provided at a first end of the spool in the one direction, into which the operating pressure is input and the operating pressure is input to the first end; a proportional valve pressure chamber provided at a second end opposite to the first end of the spool in the one direction, into which the proportional valve pressure is input and the proportional valve pressure is input to the second end; a spring pressing the first end of the spool toward the second end; an output port outputting the higher of the pressure input to the first end and the pressure input to the second end; an operating pressure input port connected to the output port when the pressure input to the first end is higher than the pressure input to the second end; a proportional valve pressure input port connected to the output port when the pressure input to the second end is higher than the pressure input to the first end; and a tank port connecting the operating pressure chamber and the tank when the pressure input to the second end is higher than the pressure input to the first end. A switching valve having, Another switching valve that inputs the proportional valve pressure to the proportional valve pressure chamber and the proportional valve pressure input port by inputting the above operating pressure. A pressure selection device equipped with
An electronic proportional valve that outputs a proportional valve pressure based on an electrical signal of the operating pressure input by the operation of the control unit, and selection section Equipped with, The above selection unit is, If the above proportional valve pressure is less than or equal to the value obtained by adding a correction pressure to the above operating pressure, the above operating pressure is selected, and the selected pressure is output. When the proportional valve pressure becomes higher than the value obtained by adding the correction pressure to the above operating pressure, the proportional valve pressure is selected, and the selected pressure is output. Immediately after stopping the operation of the above operating unit, the above operating pressure and the above proportional valve pressure are relieved to the tank. Pressure selection device.
A pressure selection device described in any one of paragraphs 1, 2, 7 and 8, and A hydraulic control valve driven based on the selected pressure of the above pressure selection device, and A hydraulic control device having a hydraulic actuator driven and controlled by the above hydraulic control valve.
In any one of paragraphs 1, 2 and 8, The above selection unit is a pressure selection device comprising a switching valve that switches the operating pressure and the proportional valve pressure, and another switching valve that inputs the proportional valve pressure to the switching valve when the operating pressure is input.

Description

Pressure Selector and Hydraulic Controller The present invention relates to a pressure selection device and a hydraulic control device. Construction machinery such as hydraulic shovels that operate using hydraulic fluid are driven and controlled by a hydraulic control device. The hydraulic control device is equipped with a hydraulic actuator that operates a boom or arm, a control unit operated by an operator, a hydraulic pump that supplies hydraulic fluid to the hydraulic actuator, and a hydraulic control valve. The hydraulic control valve is driven based on the operation of the control unit by the operator. The hydraulic control valve controls the supply of hydraulic fluid to the hydraulic actuator. Here, the hydraulic control device may be provided with a controller (operating unit) that outputs the operating pressure of the operating part as a signal, and an electronic proportional valve that controls the operation of the hydraulic control valve by being driven based on the output signal from the controller. The controller has a control circuit that detects the operating pressure of the operating part and converts the detected result into a predetermined signal. The controller converts the operating pressure of the operating part into a predetermined signal through the control circuit and outputs it to the electronic proportional valve. By using an electronic proportional valve, the structure of the hydraulic control device can be simplified, or the layout of each component can be improved. FIG. 1 is a schematic diagram of a construction machine in an embodiment of the present invention. FIG. 2 is a schematic diagram of a hydraulic control device in an embodiment of the present invention. FIG. 3 is a schematic diagram of a hydraulic control device in the first initial operation in an embodiment of the present invention. FIG. 4 is a schematic diagram of a hydraulic control device in the second initial operation in an embodiment of the present invention. FIG. 5 is a schematic diagram of a hydraulic control device during operation in an embodiment of the present invention. FIG. 6 is a schematic diagram of a hydraulic control device immediately after stopping operation in an embodiment of the present invention. FIG. 7 is a schematic diagram of a hydraulic control device at rest in an embodiment of the present invention. FIG. 8 is a graph showing the change in pressure of the operating fluid in an embodiment of the present invention, FIG. 8 (a) shows the change in pressure of the operating pressure and the secondary pressure of the proportional valve, FIG. 8 (b) shows the change in pressure of the case-side output port of the selection unit, and FIG. 8 (c) shows the change in pressure selected by the selection unit. Next, embodiments of the present invention will be described based on the drawings. Construction Machinery Figure 1 is a schematic diagram of a construction machine (100). As illustrated in FIG. 1, the construction machine (100) is, for example, a hydraulic shovel. The construction machine (100) is equipped with a slewing body (101) and a driving body (102). The slewing body (101) is slewingly provided on the driving body (102). The slewing body (101) is slewingly driven by a hydraulic motor not illustrated. The slewing body (101) is equipped with a cab (103) on which an operator rides, a boom (104) having one end that is oscillatingly connected to the cab (103), an arm (105) having one end that is oscillatingly connected to the other end (front end) of the boom (104) opposite to the cab (103), and a bucket (106) having the other end (front end) of the arm (105) that is oscillatingly connected to the boom (104) opposite to the boom. These cab (103), boom (104), arm (105), and bucket (106), etc., are driven by a hydraulic actuator (107) of a hydraulic control device (120). The hydraulic control device (120) is driven based on hydraulic fluid supplied from a hydraulic pump (108) provided within the cap (103). The hydraulic control device (120) is composed of a hydraulic actuator (107), a hydraulic control valve (109) that controls the driving of the hydraulic actuator (107) by means of hydraulic fluid supplied from the hydraulic pump (108), and a pressure selection device (1) that controls the driving of the hydraulic control valve (109). Additionally, within the cap (103), an operating part (110) is provided for operating the slewing body (101), the cap (103), the boom (104), the arm (105), and the bucket (106), etc. The hydraulic actuator (107) is a hydraulic motor that rotates the slewing body (101), or a hydraulic cylinder that drives the cab (103), boom (104), arm (105), and bucket (106), etc. The hydraulic control valve (109) is connected to the hydraulic actuator (107) and supplies the desired hydraulic fluid to the hydraulic actuator (107). The control unit (110) constitutes a part of the pressure selection device (1). The pressure selection device (1) is driven based on the operation of the