KR20230149623A - Agricultural work vehicle with valve malfunction warning function - Google Patents

Abstract

An agricultural work vehicle including a valve malfunction warning function is launched. The agricultural work vehicle according to the present invention is connected to the hydraulic circuit of the agricultural work vehicle and takes out hydraulic pressure from the hydraulic circuit and supplies it to an external working machine connected to the rear of the agricultural work vehicle, and the valve assembly is damaged from the circuit pressure in front of the valve assembly. It includes a warning device that determines operation and provides a warning to the user when it is determined to be a misoperation. The warning device includes a pressure sensor provided to detect the circuit pressure in front of the valve assembly and a signal output from the pressure sensor, and As a result of the processing, if an abnormality in pressure within the circuit is detected, a control unit determines that it is a malfunction of the valve assembly and generates a corresponding follow-up signal, and if an abnormal pressure is detected, a warning signal is generated from the follow-up signal output by the control unit. The point is that it consists of a warning unit that outputs to the outside.

Description

Agricultural work vehicle with valve malfunction warning function}

The present invention relates to an agricultural work vehicle, and more specifically, to a device that detects malfunction of a valve assembly that extracts the hydraulic pressure inside the agricultural work vehicle and supplies it as a power source to an external work machine at the rear of the agricultural work vehicle and provides a user-recognizable warning. This relates to an agricultural work vehicle that includes a valve malfunction warning function.

Agricultural work vehicles called 'tractors' have an advantageous structure and characteristics for performing various tasks by attaching a work tool to the hitch (hereinafter referred to as 'three-point hoisting device') at the rear of the aircraft. For example, by attaching tools such as rakes, rotavators, plows, and harrows to the hitch, various agricultural tasks such as tillage, soil removal, pest control, pumping, and threshing can be performed. You can.

The 3-point lifting device is a device that configures the 3-point lifting device according to the flow control of the working fluid (hereinafter referred to as 'pressure oil') of the lifting control valve, which is operated by a signal output from the controller according to the operation of the lever of the control device around the driver's seat of the agricultural work vehicle. The lifting cylinder can be driven to lift or lower by extending or contracting, thereby adjusting the height of the work tool relative to the ground.

The rear of the agricultural work vehicle is also provided with a valve assembly that extracts hydraulic pressure for driving the work machine from the agricultural work vehicle and supplies it to the work machine. The valve assembly is connected to the work machine's actuator and a hydraulic connection medium such as a hydraulic hose to enable two-way fluid movement. Therefore, the work machine is driven by hydraulic pressure extracted from the agricultural work vehicle, and the hydraulic pressure that has completed work from the work machine is returned to the agricultural work vehicle. .

A conventional valve assembly installed on an agricultural work vehicle consists of a plurality of manual directional control valves that switch the flow path by manually moving a spool installed inside. This is configured to block the hydraulic pressure supplied to the work machine by pushing or pulling the lever provided on each valve to change the direction of the hydraulic pressure supplied to the work machine, or by operating the lever to the neutral position to open the return line (exhaust passage).

Among the plurality of manual directional control valves constituting the conventional valve assembly, one is a detent double-acting valve, and the others are spring-restoring general double-acting valves. Among them, the detent double-acting valve, unlike the general double-acting valve, remains open unless the user restores the valve lever to the neutral position. Therefore, it is suitable for work machines equipped with hydraulic motors that require continuous flow.

However, if the detent double-acting valve is open while the work machine is not connected, the oil temperature continues to rise, which may accelerate deterioration of O-rings or oil seals, or cause serious failures throughout the hydraulic system, such as oil leakage. This is because the fact that the detent double-acting valve is open without connection to the work machine means that the return path of the pressure fluid supplied to the detent double-acting valve is blocked.

Therefore, the detent double-acting valve requires careful attention and attention from the user. Nevertheless, during actual field use, there are frequent cases where the detent double-acting valve is left open in situations other than the work environment using the detent double-acting valve due to the user's carelessness or incorrect operation of the valve lever. Even if it is open, there is a problem that it is very difficult for users to recognize it unless they look carefully.

Japanese Patent Publication No. 2008-061552 (published on March 21, 2008)

The technical problem that the present invention aims to solve is to detect pressure rises due to valve malfunction (opening of the detent double-acting valve when the workpiece is not connected) and to warn the user so that he or she can quickly recognize a dangerous situation, thereby providing prompt action. The goal is to provide an agricultural work vehicle that includes a valve malfunction warning function to enable follow-up action.

According to an embodiment of the present invention as a means of solving the problem,

A valve assembly connected to the hydraulic circuit of the agricultural work vehicle, extracting hydraulic pressure from the hydraulic circuit and supplying it to an external working device connected to the rear of the agricultural work vehicle; and

It includes a warning device that determines malfunction of the valve assembly from the circuit pressure in front of the valve assembly and warns the user in a recognizable manner when malfunction is determined,

The warning device is,

a pressure sensor provided to detect circuit pressure in front of the valve assembly;

A control unit that processes the signal output from the pressure sensor and, when an abnormal pressure in the circuit is detected as a result of the processing, determines it to be a malfunction of the valve assembly and generates a corresponding follow-up signal;

Provided is an agricultural work vehicle including a valve malfunction warning function, which is comprised of a warning unit that generates a warning signal from a follow-up signal output by the control unit when an abnormal pressure is detected and outputs it to the outside.

Here, the pressure sensor is,

The input line that supplies hydraulic pressure to the valve assembly or the point where the input line is connected to the input port of the valve assembly can be installed to detect the pressure of the fluid in the circuit.

In addition, the control unit determines that the pressure in the circuit ascertained from the output signal of the pressure sensor is higher than the set pressure, and if the condition above the set pressure continues for the set time, it is determined to be malfunction of the valve assembly and sends a corresponding follow-up signal to the warning means. It can be printed to .

In addition, the valve assembly is laminated and coupled to enable mutual fluid flow, and includes directional control valves of a manually operated double-acting valve structure in which a spool installed inside moves by a manipulation force manually input from the outside to change the flow path, and a relief valve, It may be composed of a valve cover having an internal flow path connected to the uppermost directional control valve among the directional control valves to allow fluid movement.

Here, at least one of the direction control valves may be a detent double-acting valve that can fix the spool at the desired operating position by an internal detent ball when the position of the spool is manually changed through an external operating lever. .

According to an embodiment of the present invention, when an increase in pressure within the circuit is detected due to opening of the valve assembly in a state where the work machine is not connected, a warning signal is generated and output for user recognition. Accordingly, the user can quickly recognize that the valve assembly has been manipulated incorrectly and quickly take corresponding follow-up measures, thereby preventing damage to the hydraulic system and hydraulic components.

1 is an enlarged view of the rear portion of an agricultural work vehicle according to an embodiment of the present invention.
Figure 2 is a schematic diagram schematically showing the overall configuration of the present invention, including the hydraulic circuit of the valve assembly shown in Figure 1.
Figure 3 is an exemplary diagram for explaining the operation of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail.

The terms used in the specification are merely used to describe specific embodiments and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as “include” or “have” are intended to indicate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features or It should be understood that this does not exclude in advance the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Additionally, terms such as first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

In addition, terms such as “… unit,” “… unit,” and “… module” used in the specification refer to a unit that processes at least one function or operation, which may be implemented through hardware or software or a combination of hardware and software. You can.

In the description with reference to the accompanying drawings, identical components will be assigned the same drawing reference numerals, and overlapping descriptions thereof will be omitted. Additionally, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

Figure 1 is an enlarged view of the valve assembly at the rear of an agricultural work vehicle applied to the present invention, and Figure 2 is a schematic diagram schematically showing the overall configuration of the present invention, including the hydraulic circuit of the valve assembly shown in Figure 1.

Referring to Figures 1 and 2, an agricultural work vehicle including a valve malfunction warning function according to an embodiment of the present invention includes a valve assembly 10. The valve assembly 10 is connected to the hydraulic circuit of the agricultural work vehicle configured to supply hydraulic pressure to various hydraulic devices, and is an external work device that extracts hydraulic pressure from the hydraulic circuit and is connected to the rear of the agricultural work vehicle through a three-point hitch (not shown). It plays a role in supplying.

That is, the valve assembly 10 controls the extraction of hydraulic pressure from the agricultural work vehicle to the outside of the agricultural work vehicle for operating an external work tool connected to the three-point hitch. The valve assembly 10 can be firmly fixed by bolting to the dedicated mounting surface of the upper surface of the lifting unit cover 30 at the rear of the agricultural work vehicle, as shown in the example of FIG. 2, and in some cases, a three-point hitch lifting control valve. It may be configured to receive hydraulic pressure in priority to the assembly (not shown).

Specifically, the valve assembly 10 includes a plurality of manual double-acting valve structures, preferably three directional control valves 10a to 10c, in which the flow state is switched by moving an internal spool with a physical operation signal input from the outside, It includes a relief valve 120 and includes a valve cover 12 having an internal flow path 122 connected to the uppermost directional control valves 10a to 10c among the directional control valves 10a to 10c to enable fluid movement.

At least one of the plurality of directional control valves (10a to 10c) is a detent double-acting valve that can fix the spool at the desired operating position by an internal detent ball when the position of the spool is manually changed through an external operating lever. (10a), and the others may be spring-restoring general double-acting valves (10b, 10c) in which the valve opens only while the corresponding operating lever is being pushed or pulled and is elastically restored to its original neutral position when external force is removed.

The detent double-acting valve (10a) can secure the spool in a desired position through the detent ball structure, thereby enabling continuous supply of hydraulic pressure to an external work machine. Therefore, it is suitable for use in working machines that require a continuous flow rate, for example, a work machine that includes a hydraulic motor that continuously requires a flow rate as a main component, such as a towed agricultural work vehicle.

A plurality of directional control valves (10a to 10c) constituting the valve assembly 10 allow pressure fluid supplied from an input line (pilot line, L1) connected to the P port to pass through or to each output port (each valve It may have a stacked structure as shown in the example in the drawing so that it can be supplied to an external working device through ports A and B formed in , and neighboring valves may be connected to each other to allow fluid flow.

Each directional control valve (10a to 10c) having a double-acting valve structure has one input port, two output ports (port A and port B), one discharge port connected to the drain line (L4), and one discharge port when the valve is not used. It can be a 6PORT 3WAY valve that includes two neutral ports that allow pressure fluid to pass through, and is used by connecting the actuator of a work machine that uses hydraulic pressure to the output port of the desired direction control valve (10a~10c) with a hydraulic hose.

Accordingly, each of the direction control valves 10a to 10c is a neutral valve formed on the actuator of the external work machine, for example, a switch that extends the hydraulic cylinder or conversely contracts the hydraulic cylinder, depending on the position of the internal spool according to the operating force input. Position control is possible in a total of three directions, including neutral position switching, which allows hydraulic pressure to pass through the valve as is through the line.

Meanwhile, among the directional control valves 10a to 10c constituting the valve assembly 10, the previously mentioned detent double-acting valve 10a opens only while the operating lever is being pushed or pulled, and returns to its original state when external force is removed. Unlike a spring-restoring double-acting valve that is elastically restored to the neutral position, when the operating lever is pulled to one side or pushed to the other side, the operating lever and the spool connected to it are fixed in that position and the valve is maintained in an open state.

Therefore, if the detent double-acting valve (10a) is open without an external workpiece connected, the oil temperature continues to rise, which may accelerate deterioration of O-rings or oil seals, or cause serious failures throughout the hydraulic system, such as oil leakage. . This is because if the detent double-acting valve (10a) is open without connection to the work machine, the return path of the hydraulic pressure supplied to the detent double-acting valve (10a) is blocked.

Therefore, the detent double-acting valve 10a requires careful attention and attention from the user. Nevertheless, during actual field use, the detent double-acting valve (10a) is frequently left open in situations other than the working environment using the detent double-acting valve (10a) due to the user's carelessness or malfunction of the valve lever, etc. Even if the detent double-acting valve 10a is open, it is very difficult for the user to recognize this unless he or she looks carefully.

Accordingly, the embodiment of the present invention prevents the above problems (problems in which the circuit pressure increases and the oil temperature increases when the detent double-acting valve (10a) is opened when the work machine is not connected) due to the user's carelessness or valve malfunction. As a means of doing so, it includes a warning device 20 that warns the user so that the user can recognize it when the valve operation state of the valve assembly 10 is incorrect and an abnormal pressure in the circuit is detected.

The warning device 20 determines malfunction of the valve assembly 10 from the circuit pressure in front of the valve assembly 10. And if it is determined to be an incorrect operation, a warning is issued so that the user can recognize it. Here, malfunction of the valve assembly 10 means that the detent double-acting valve 10a opens one of the two output ports (port A and port B) while an external workpiece is not connected. It means that it has been manipulated to do something.

The warning device 20 preferably includes a pressure sensor 22, a control unit 24, and a warning unit 28. The pressure sensor 22 detects the circuit pressure in front of the valve assembly 10 and provides detection information to the control unit 24, and the control unit 24 has the detection information provided by the pressure sensor 22. It is determined whether the valve assembly 10 has been malfunctioned, and if there is a malfunction, a corresponding follow-up signal is generated and output to the warning unit 28.

The pressure sensor 22 may be preferably installed on the above-described input line (pilot line, L1) that supplies hydraulic pressure to the valve assembly 10 and configured to detect the pressure of the fluid in the circuit. More preferably, as shown in the example of FIG. 2, it is installed at the point where the input line (L1) and the input port (P port) of the valve assembly 10 meet (connected point) and is configured to detect the pressure of the fluid in the circuit. It can be.

The control unit 24 processes the signal (pressure information signal) output from the pressure sensor 22. In addition, as a result of signal processing, if an abnormality in the pressure within the circuit, or more specifically, an increase in the circuit pressure, is detected, it is judged to be a malfunction of the valve assembly 10, and a corresponding follow-up signal is generated and output to the outside. Here, the follow-up signal may be an operating signal that activates the warning unit 28.

The control unit 24 preferably determines that the pressure in the circuit determined from the output signal of the pressure sensor 22 is higher than the set pressure preset in the recording device, and that the state above the set pressure continues for the set time preset in the recording device. In case of malfunction of the valve assembly 10, it may be determined to be configured to output a corresponding follow-up signal to the warning unit 28 according to the judgment.

This is to accurately determine whether the pressure abnormality in the circuit is due to a temporary pressure increase or a continuous pressure increase due to malfunction of the valve assembly 10. If the condition above the set pressure does not continue for the set time, It is recognized as a temporary change in circuit pressure due to a change in oil temperature, etc., and the subsequent process (generation of a follow-up signal) is omitted.

Meanwhile, the warning unit 28 generates a warning signal from the follow-up signal output by the control unit 24 when an abnormality in pressure within the circuit is detected and outputs it to the outside. The warning unit 28 may be, for example, a flashing warning light provided on the instrument panel or a buzzer that outputs a warning sound, and the user recognizes the valve malfunction through the warning signal of the warning unit 28 and takes prompt follow-up action (detent). The double-acting valve (10a) can be operated in neutral.

Not illustrated, reference numerals P1 and P2 are hydraulic pumps that suck in working fluid from the oil tank and discharge it at a constant pressure. P1 is a hydraulic pump connected to the steering line, and P2 is connected to the hydraulic line on the valve assembly 10 side described above. It is a hydraulic pump. And reference numerals F1 and F2 indicate oil filters installed between the hydraulic pumps (P1 and P2) and the oil tank (symbols omitted).

Hereinafter, the operation and effects of the present invention will be briefly examined in connection with the operation status of the valve assembly described above and the operation of the warning device accordingly.

Figure 3 is an exemplary diagram for explaining the operation of the present invention. In the absence of connection to an external working machine using hydraulic pressure, the detent double-acting valve of the valve assembly is opened toward port A and is operated to extract hydraulic pressure to the outside. This is a drawing illustrating the state.

As shown in FIG. 3, when the detent double-acting valve (10a) of the valve assembly (10) is switched to the side that opens port A in a state where no external working machine is connected, the hydraulic pressure supplied through the input line (L1) opens the valve. It is supplied to the detent double-acting valve (10a) through the oil supply line (L2) in the assembly (10), and the hydraulic line on the A port side of the valve (10a) is filled with fluid and hydraulic pressure is applied.

However, because there is no connection to an external working machine, the hydraulic pressure on the A port side cannot escape to the outside, and fluid movement through the neutral line (L3) is also blocked in the circuit. That is, the return path of the hydraulic pressure supplied to the valve assembly 10 is blocked. As a result, the circuit pressure rises rapidly and the oil temperature rises. The pressure sensor 22 detects changes in pressure within the circuit in real time, and the detected information is directly transmitted to the control unit 24.

When information (information on pressure within the circuit) is provided from the pressure sensor 22, comparison with the set pressure preset in the recording device is performed in real time by the control unit 24. As a result of the comparison, if the pressure in the circuit is greater than the set pressure, the count function included in the control unit 24 operates to continuously count the time from when the pressure in the circuit exceeds the set pressure.

If the circuit pressure falls below the set pressure during the count, the control unit 24 recognizes it as a temporary increase in circuit pressure due to a change in oil temperature, etc., switches back to the circuit pressure monitoring mode without proceeding with the subsequent process, and sets the cumulative time according to the count. When the time is reached, it is judged to be a malfunction of the valve assembly (10). Then, a corresponding follow-up signal is generated and output to the warning unit 28.

Accordingly, a warning signal through the warning unit 28 is displayed in a user-recognizable manner, and the user is able to recognize the state of valve malfunction from the warning signal generated by the warning unit 28 and quickly take corresponding follow-up measures. will be. Here, the follow-up action to increase may be a measure to secure the escape route of hydraulic pressure by manipulating the valve lever of the detent double-acting valve 10a to the neutral position.

According to the embodiment of the present invention discussed above, when an increase in pressure within the circuit is detected due to opening of the valve assembly in a state where the work machine is not connected, a warning signal is generated and output for user recognition. Accordingly, the user can recognize malfunction of the valve assembly and quickly take corresponding follow-up measures, and as a result, damage to the hydraulic system and hydraulic components due to an increase in circuit pressure can be prevented.

In the above detailed description of the present invention, only special embodiments thereof have been described. However, it should be understood that the present invention is not limited to the particular form mentioned in the detailed description, but rather is understood to include all modifications, equivalents and substitutes within the spirit and scope of the present invention as defined by the appended claims. It has to be.

10: valve assembly
10a: Directional control valve (detent double-acting valve)
10b, 10c: Directional control valve (spring restoration type general double-acting valve)
12: Valve cover
20: warning device
22: pressure sensor
24: control unit
28: warning unit
30: Elevating unit cover
L1: input line (pilot line)
L2: Oil supply line
L3: Neutral line
L4: Drainage line

Claims (6)

A valve assembly connected to the hydraulic circuit of the agricultural work vehicle, extracting hydraulic pressure from the hydraulic circuit and supplying it to an external working device connected to the rear of the agricultural work vehicle; and
It includes a warning device that determines malfunction of the valve assembly based on circuit pressure information in front of the valve assembly, and warns the user in a recognizable manner when malfunction is determined,
The warning device is,
a pressure sensor provided to detect circuit pressure in front of the valve assembly;
A control unit that processes the signal output from the pressure sensor and, when an abnormal pressure in the circuit is detected as a result of the processing, determines it to be a malfunction of the valve assembly and generates a corresponding follow-up signal;
An agricultural work vehicle including a valve malfunction warning function, characterized in that it consists of a warning unit that generates a warning signal from a follow-up signal output by the control unit when an abnormal pressure is detected and outputs it to the outside.
According to claim 1,
An agricultural work vehicle including a valve malfunction warning function, wherein the pressure sensor is installed on an input line that supplies hydraulic pressure to the valve assembly.
According to claim 1,
An agricultural work vehicle including a valve malfunction warning function, wherein the pressure sensor is installed at a point where an input line that supplies hydraulic pressure to the valve assembly meets the input port of the valve assembly.
According to claim 1,
The control unit is,
If the pressure in the circuit determined from the output signal of the pressure sensor is higher than the set pressure, and the condition above the set pressure continues for the set time, it is judged to be malfunction of the valve assembly and outputs a corresponding follow-up signal to the warning means. An agricultural work vehicle that includes a valve malfunction warning function.
According to claim 1,
The valve assembly includes directional control valves of a double-acting valve structure that are stacked and coupled to enable mutual fluid flow, and in which a spool installed inside is moved by a manipulation force manually input from the outside to change the flow path;
An agricultural work vehicle including a valve malfunction warning function, comprising: a valve cover including a relief valve and an internal flow path connected to the uppermost directional control valve among the directional control valves to enable fluid movement.
According to claim 5,
An agricultural work vehicle including a valve malfunction warning function, wherein at least one of the directional control valves is a detent double-acting valve.

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