KR101514427B1 - Safety control apparatus and method for hydraulic device of press car - Google Patents

Abstract

The present invention relates to a safety device for a hydraulic device related to the addition of a hydraulic oil backflow prevention device, a clutch and an accelerator pedal, and an electric signal when a power take-off (PTO) is switched off, And it is possible to increase the reliability of the crushing truck. Further, it is also possible to provide a sensor for detecting whether the pump is operating, a ratio differential type RPM detecting device using a micom method, a mechanical switch, The present invention relates to a safety control apparatus and method for a hydraulic device for a press-on-the-go vehicle, which is capable of reducing the cost of a manufacturer by making it possible to configure the valve with a low cost by using a check valve or the like.

Description

TECHNICAL FIELD [0001] The present invention relates to a safety control apparatus and a method for controlling a hydraulic apparatus for a press-

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a safety control device and method for a hydraulic device for a press-on-rail vehicle, and more particularly to a safety control device for a hydraulic device for pressing a garbage or the like And more particularly, to a safety control apparatus and method for a hydraulic device for a press-contact-train-carrying vehicle.

Generally, a specially equipped car means a car used for a special purpose by having special equipment, including a fire truck, a snow plow, a mixer truck, a tank lorry, and a pressurized car to carry out loading and transportation by squeezing waste.

Particularly, as described above, the pressurized emergency car that presses and carries the garbage is installed in a box-shaped loading box opened at one side (for example, rear side) for loading the garbage and in a cover form at the opening portion of the loading box, And a packer is installed to prevent the discharged garbage from being discharged to the outside during transportation.

The parka is hinged to the loading box and is configured to lift or lower the parka by an actuator (or a hydraulic cylinder). For example, when a switch (for example, a parker opening / closing switch) of a control box configured on the outside of the vehicle or a driver's seat is input, the actuator is operated to lift or lower the parker.

The operation of the above-described press-fitting mechanism is already known.

However, the above-mentioned conventional press-in-advance type differential pressure increases the state in which the hydraulic oil pump is not operated (that is, the PTO is switched off or the clutch is depressed) When the opening switch is input or when the opening switch is re-inputted instead of the closing switch due to insufficient operation, the door is rapidly lowered due to the weight of the parka (the weight of the parker itself) There is a problem in that a safety accident (an accident that an operator is killed is often reported) that may put a worker at risk into danger may occur. Also, there is a problem that the loader and the parker may be damaged by a collision between them.

In addition, the above conventional hydraulic pressure apparatus for hydraulic excavator (including hydraulic oil system, electric system, and actuator) draws power of the engine by a power take-off (PTO) and drives the hydraulic oil pump When the accelerator pedal is depressed, the power of the engine is increased. As a result, the rotational speed of the hydraulic oil pump is increased to form a strong oil pressure by the hydraulic oil pump. Thus, the parka and the dump (Which lifts the opposite side of the opening portion to be inclined so as to unload the garbage) is rapidly increased to increase the danger of the conduction, thereby causing a safety accident that may put the operator (operator) have.

The background art of the present invention is disclosed in Korean Registered Utility No. 20-0415504 (Mar. 26, 2006). The background art is that a dumper installed in a loading box for loading and unloading garbage can not be dumped in a state where a tailgate is closed from a loading rack and a damper of a tailgate and a safety accident can be prevented from occurring, This is a technology related to safety devices.

The background art is a technique for driving a cylinder that tilts a loading box at a predetermined angle only when a tailgate is opened for unloading garbage. It does not provide a method for preventing rapid descent of a parka lifted to the upper part, and Nor does it provide a method for preventing the rapid increase of the parka and the dump due to the increase of the rotational speed of the hydraulic oil pump while the hydraulic apparatus is in operation. Therefore, the above background art has many differences in the purpose, the constitution and the effect of the present invention.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a safety control device and method for a hydraulic pressure device for preventing a safety accident of a hydraulic pressure device associated with a dropping of a parking pressure of a press- have.

It is another object of the present invention to provide a safety control device and method for a hydraulic device for preventing a safety accident of a hydraulic device related to a parka rush of a crushing car.

A safety control apparatus for a hydraulic pressure apparatus for a press-on-rail vehicle according to one aspect of the present invention is a hydraulic oil system of a hydraulic apparatus for a press- Wherein the hydraulic oil backflow prevention valve includes a hydraulic oil backflow prevention valve disposed in an output port of a control valve for regulating a supply flow rate, wherein the hydraulic oil backflow prevention valve allows hydraulic oil to flow only in the direction of the actuator from the oil tank, And the valve is a valve of the structure.

According to another aspect of the present invention, there is provided an apparatus for controlling safety of a hydraulic apparatus for pressurized emergency vehicles, comprising: a pump operation detecting unit for detecting whether the hydraulic oil pump operates; An electric signal blocking unit for blocking an electric signal applied to the load side valve when the hydraulic oil pump is not operated; A pump rotational speed detector for detecting rotational speed of the hydraulic oil pump during operation; And a control unit for controlling the electric signal blocking unit to shut off the electric signal transmitted to the load side valve when the difference in the number of rotations or the number of rotations after a predetermined time becomes equal to or greater than a predetermined number of revolutions, And a control unit.

In the present invention, the electric signal interrupting unit may be configured such that, when the clutch of the vehicle is depressed, the accelerator pedal of the vehicle is depressed for a predetermined depth or more, and the hydraulic oil pump is not operated, The control unit may interrupt the electric signal applied to the load side valve under the control of the control unit.

In the present invention, the electric signal blocking unit may include: a first electric signal blocking unit for applying or blocking an electric signal to a next electric system by combining an engine starting state, a parking brake operation state, and a gear neutral state of the vehicle; A relay control unit for controlling a corresponding relay for transmitting an electric signal according to whether or not the vehicle is inputting a clutch, inputting an accelerator pedal, or inputting a P.T.O switch; A second electrical signal blocking unit for applying or blocking the electrical signal to the next electrical system by combining the operating states of the relays; A third electric signal blocking part for receiving or inputting the electric signal to each of the control valves for actuating the actuators, And an interlock circuit portion for preventing operation of another actuator when the actuator is operated by the hydraulic device operation switch.

In the present invention, the first electric signal interrupting unit may be configured to logically multiply the presence or absence of the engine start state, the parking brake state, and the gear neutral state of the vehicle so that the vehicle engine is started, the parking brake is engaged, And an electric signal is applied to the next electric system when the gear is in a neutral state, and an electric signal to the next electric system is blocked when any one of the operating states is not satisfied.

In the present invention, the second electrical signal interrupting unit sequentially connects the contacts of the relays in a sequence connection manner, logically multiplies the operating states of the relays, and determines whether any one of the relay contacts And the electric signal applied to the next electric system is cut off when the electric system is opened.

According to another aspect of the present invention, there is provided a safety control method for a hydraulic pressure apparatus for a press-on-rail vehicle, the method comprising the steps of: detecting whether the hydraulic oil pump is operating; Detecting rotation speed of the hydraulic oil pump during operation; And blocking the electric signal transmitted to the load side valve when the number of revolutions after a predetermined time or the number of revolutions becomes equal to or greater than a predetermined number of revolutions .

In the present invention, the step of interrupting the electric signal may include: when the clutch of the vehicle is depressed, when the accelerator pedal of the vehicle is depressed for a predetermined depth or more, and when the hydraulic oil pump is not operated, The control unit interrupts the electric signal applied to the load side valve when it is at least any one of the case of turning off the PTO switch or the case of turning off the PTO switch.

In the present invention, the step of interrupting the electric signal may be a step of logically multiplying the engine start state, the parking brake operation state, and the gear neutral state by a logical sum of the vehicle engine start state and the parking brake state , And when the gear is in a neutral state, the electric signal to the next electric system is blocked.

Blocking an electric signal applied to a control valve of the actuator to prevent operation of another actuator when at least one actuator operating switch of the at least one actuator included in the hydraulic apparatus is input; And further comprising:

The present invention relates to a safety device for a hydraulic device related to the addition of a hydraulic oil backflow prevention device, a clutch and an accelerator pedal, and an electric signal when a power take-off (PTO) is switched off, And it is possible to increase the reliability of the crushing truck. Further, it is also possible to provide a sensor for detecting whether the pump is operating, a ratio differential type RPM detecting device using a micom method, a mechanical switch, And the backflow prevention valve of the hydraulic oil, so that it is possible to reduce the cost of the manufacturing company.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an illustration showing a hydraulic oil system related to parka opening and closing operations of a press-in truck according to an embodiment of the present invention; Fig.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a hydraulic oil system.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a hydraulic oil supply apparatus and a hydraulic oil supply apparatus.
4 is a view showing a schematic configuration of a safety control device for preventing a safety accident of a hydraulic system in an electric system according to an embodiment of the present invention;
FIG. 5 is an exemplary diagram illustrating a schematic configuration of the electric signal blocking unit 320 according to an embodiment of the present invention. Referring to FIG.
6 is a flowchart illustrating a control method of a safety control device for preventing a safety accident of a hydraulic device according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a safety control apparatus and method of a hydraulic press apparatus for a press-on-rail vehicle according to the present invention will be described with reference to the accompanying drawings.

In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. 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. Therefore, definitions of these terms should be made based on the contents throughout this specification.

Brief Description of the Drawings Fig. 1 is an exemplary view showing a hydraulic oil system related to parka opening and closing operations of a press-in truck according to an embodiment of the present invention; Fig.

Generally, a pressurized main body is provided with a hydraulic oil system related to the opening / closing control of the parka, a hydraulic oil system related to the control of the slider pushing out the contents stored in the loader to the outside, and the side opposite to the opening of the loading / And a hydraulic oil system associated with dump control to unload the contents.

The present invention relates to a hydraulic oil system for controlling the opening and closing of parka among the hydraulic oil systems. As shown in Fig. 1, a hydraulic oil backflow prevention valve (e.g., a check valve) (210). The hydraulic oil backflow prevention valve 210 is also called a non-return valve, in which the oil flows freely only in one direction and does not flow in the opposite direction.

As shown in FIG. 1, the hydraulic oil system of the pressurized emergency vehicle according to an embodiment of the present invention includes a PTO valve (a valve that serves to open and close PTO shaft power) (not shown), a control valve (E.g., a pilot changeover valve, a valve 110 for regulating the supply flow rate of the hydraulic oil for raising the parka), and a hydraulic oil discharge valve (e.g., a flow control valve, And a valve 120 for maintaining a predetermined constant pressure value.

For reference, the P.T.O valve (or P.T.O actuator solenoid valve) (not shown) is a vacuum valve which is used to transfer or shut off the vacuum generated by a vacuum pump (not shown) of a vehicle generator to a P.T.O actuator (not shown). When the vacuum is applied to the solenoid valve, the diaphragm (not shown) pulls the gear to connect the power to rotate the PTO pulley (not shown), connect the V-belt to the PTO pulley, It will be used in other devices (eg hydraulics).

The electronic pilot switching valve used as the control valve 110 is a combination of a pilot valve and a solenoid valve so that a large flow rate can be easily switched by electrical operation. For example, the control valve shown in Fig. 1 shows a four-port, three-position switching valve (e.g., a spring-loaded, double coil, external drain type, etc.) as one embodiment.

Also, the control valve 110 is a solenoid valve operated by an electric signal. Since the electric signal is supplied from a power source of the battery, the control valve 110 is always in a live state (that is, in a live state). Therefore, in the present invention, when a situation that does not comply with the stable condition described below occurs, the electric signal is blocked to provide a safety device and a control method thereof.

Further, the control valve 110 is normally closed, and when the electric signal is applied to the solenoid (that is, when the parka opening switch or the parka rising switch is inputted), the control valve 110 is switched to the open state And when the electric signal applied to the solenoid is interrupted, it is switched to a close state to shut off the oil passage.

Accordingly, when the oil passage is formed, a hydraulic oil pump (not shown) is operated to supply oil to the inlet port side from an oil tank (not shown) and flow in the forward direction. If the oil pressure pump If it is not operated, the already inhaled oil may flow back to the oil tank and flow, so be careful with the operation of the parka open switch.

The flow rate adjusting valve used as the hydraulic oil discharge valve 120 is a valve that is provided with a kind of pressure compensation valve inside to keep the flow rate constant regardless of the load variation. Even if the pressure changes before and after the valve, This makes it possible to keep the speed of an actuator (for example, a hydraulic cylinder) connected thereto connected thereto constant by preventing a difference in the secondary pressure from occurring. That is, when the user inputs the parka closing switch (or the parka lowering switch) through the control box of the pressurized emergency car, the oil is regularly discharged through the hydraulic oil discharge valve regardless of the self weight of the parka, So that the parka can descend at a speed (i.e., a predetermined speed set in advance).

Hereinafter, the normal operation of the hydraulic oil system related to opening and closing of the parka will be described with reference to FIG.

2 is an exemplary view for explaining a normal operation of the hydraulic oil system related to parka opening and closing according to an embodiment of the present invention.

2 (a), when the user inputs a parka opening switch (or a parka raising switch), an electric signal is applied to the solenoid of the control valve 110 to switch the valve to the open state, A flow passage is formed. The hydraulic oil pump (not shown) is operated to generate hydraulic pressure by the oil flowing to the hydraulic cylinder (not shown) through the hydraulic oil check valve 210 connected to the output port of the control valve 110, An actuator connected to the control valve (eg a hydraulic cylinder lifting the parka) is actuated to lift the parka.

For reference, the hydraulic cylinder is an actuator that performs linear motion in which the cylinder is proportional to the effective cross-sectional area and the pressure difference. When the high-pressure oil generated by driving the hydraulic oil pump is sent to the cylinder through the valve, .

After lifting the parker as described above, the electric signal applied to the solenoid is interrupted to switch the control valve 110 to the close state, and no oil pressure is generated even when the hydraulic oil pump is stopped. That is, the parka is kept raised.

2 (b), when the user inputs the parka closing switch (or the parka lowering switch), the hydraulic oil in the hydraulic cylinder (not shown) performing the opening and closing of the parka is returned to the hydraulic oil And is discharged at a preset flow rate through the discharge valve 120, so that the parka is lowered at a constant speed. When the parka closing switch (or parka lowering switch) is input as described above, the oil is discharged to the normal system even if the hydraulic oil check valve 210 is not installed.

However, after the parka is lifted as described above, the parka open switch (or the parka lift switch) is input again in a state where the operation of the hydraulic oil pump (not shown) is stopped, An electric signal is applied to the solenoid of the control valve 110 to switch the valve to the open state so that the oil flows in the reverse direction (i.e., from the hydraulic cylinder to the oil tank direction) as shown in Fig. A flow passage is formed.

Here, the state in which no oil pressure is generated by the hydraulic oil pump includes a P.T.O. switch off state or a state in which the clutch of the vehicle is depressed. That is, since the power of the vehicle engine is not transmitted when the P.T.O. switch is in the OFF state or the clutch of the vehicle is depressed, the operation of the hydraulic oil pump (not shown) is stopped.

However, since the hydraulic oil discharge valve 120 is not provided in the oil passage formed in the reverse direction as described above, the oil is quickly discharged from the hydraulic cylinder (not shown) and immediately flows into the oil tank (not shown). In other words, the hydraulic pressure in the hydraulic cylinder drops, and the parka is rapidly lowered due to the weight of the parka.

However, according to the present invention, when the parka opening switch (or the parka lift switch) is input again after the parka is raised as described above and no oil pressure is generated by the hydraulic oil pump (not shown) The oil flow is prevented by the hydraulic oil backflow prevention valve 210, as shown in FIG. 3 (b), even if the oil passage is formed in the reverse direction by applying the electric signal to the solenoid of the oil passage 110 . In other words, by preventing the oil pressure of the hydraulic cylinder from dropping, the parker is prevented from falling, thereby preventing the occurrence of safety accidents.

1 to 3, an apparatus and an operation for preventing a safety accident of a hydraulic device related to a parka descent of a pressurized emergency vehicle in a hydraulic oil system through a hydraulic oil backflow prevention valve 210 will be described with reference to FIGS. .

4 to 5, a safety control device and an operation thereof for preventing a safety accident of a hydraulic device related to a parka descent and a sudden rise of a crushing advance vehicle in an electric system will be described.

4 is a diagram illustrating a schematic configuration of a safety control device for preventing a safety accident in a hydraulic system in an electric system according to an embodiment of the present invention.

4, the safety control apparatus 300 includes a pump operation sensing unit 310, an electric signal shutoff unit 320, a pump rotation speed detection unit 330, and a control unit 340.

The pump operation sensing unit 310 senses whether the hydraulic oil pump (not shown) operates. For example, the operation of the hydraulic oil pump can be detected by using a sensor that detects the discharge pressure of the hydraulic oil pump, and the operation of the hydraulic oil pump can be sensed by using a sensor that detects a vibration generated when the hydraulic oil pump operates, The operation of the pump can be detected by using a sensor that detects rotation during operation.

When the hydraulic oil pump (not shown) is not operated, the electric signal blocking unit 320 blocks the electric signal applied to the load side valve (i.e., the control valve 110). For example, the electric signal cut-off part 320 may cut off the electric signal when pressing the clutch of the vehicle, depressing the accelerator pedal (i.e., the accelerator), or turning off the PTO switch.

In other words, when the PTO switch is in the OFF state or when the clutch of the vehicle is depressed, the power of the vehicle engine is not transmitted to the hydraulic oil pump and thus the electric signal applied to the load side valve (i.e., the control valve 110) .

By blocking the electric signal as described above, even when the parka opening switch (or the parka raising switch) is inputted, the electric signal is not applied to the solenoid of the control valve 110, thereby preventing the control valve 110 from being opened . In the case where the hydraulic oil pump is not operated as described above, the control valve 110 is not opened so that the parka is prevented from suddenly increasing, thereby preventing a safety accident of the pressed-on vehicle.

The pump rotational speed detector 330 detects the revolution speed (RPM) during operation of the hydraulic oil pump (not shown). When the number of revolutions of the hydraulic oil pump is equal to or greater than a predetermined number of revolutions, the electric signal interrupter 320 is controlled to shut off the electric signal applied to the load side valve (i.e., the control valve 110).

For example, when the accelerator pedal (i.e., the accelerator) is depressed in a state where the hydraulic oil pump (not shown) is operating, the rotational speed of the hydraulic oil pump increases, and sudden oil pressure may occur. Therefore, in the present invention, even when the rotational speed of the hydraulic oil pump increases, the electric signal applied to the load side valve (i.e., the control valve 110) is blocked.

As described above, even when the parka opening switch (or the parka raising switch) is inputted by blocking the electric signal, the electric signal is not applied to the solenoid of the control valve 110 so that the control valve 110 is not opened. That is, according to the present invention, when sudden oil pressure is generated, the control valve 110 is not opened so that the parking lot does not rise sharply, thereby preventing the conduction accident of the pressed-in vehicle.

The control unit 340 by using a microcomputer (not shown) a particular time (e.g., 0.1 seconds) checking the number of revolutions each time, and the predetermined period of time after-rotation speed difference or speed is a preset rotation of the (t _after t _before) (For example, 300 RPM), the electric signal blocking unit 320 is controlled to block the electric signal transmitted to the load side valve (for example, the control valve). Note that the specific time for checking the number of revolutions and the preset number of revolutions are described in one embodiment, and therefore, it is noted that the setting can be changed at any time.

Also, the control unit 340 may use a ratio differential method for checking the number of revolutions of the hydraulic oil pump (not shown) and shutting off the electric signal, or the degree of the input of the accelerator pedal (i.e., the accelerator) The degree of depression of the accelerator pedal) can be used. Or a pressure detection sensor for detecting the degree of pressure that the accelerator pedal is depressed (or depressed).

Also, the control unit 340 controls the electric signal blocking unit 320 to block the electric signal transmitted to the load side valve (e.g., the control valve) even when the hydraulic oil pump (not shown) is not operated.

Hereinafter, the operation of the electric signal blocking unit 320 will be described in more detail.

FIG. 5 is an exemplary diagram illustrating a schematic configuration of the electric signal blocking unit 320 according to an exemplary embodiment of the present invention. Referring to FIG.

As shown in FIG. 5, a combination (for example, a logical product) of an initial operating state of the vehicle (e.g., whether the engine is started, parked, A relay control unit 322 for controlling respective relays that transmit electric signals according to the operating state of the vehicle (e.g., clutch input, accelerator pedal input, PTO switch input, etc.) A second electric signal blocking unit 323 for applying or blocking an electric signal applied through the first electric signal blocking unit 321 to the next system by combining (e.g., AND) the operating states of the relays, a control box And a third electric signal intercepting unit 324 for controlling each control valve of the dump or parker by using an electric signal received through the second electric signal intercepting unit 323 when a switch of the dump or parker is inputted do.

In addition, the third electric signal interception unit 324 is provided with an interlock circuit unit for preventing the operation of the parka open / close switch when the dump open / close switch is operated and the operation of the dump open / close switch when the parka open / close switch is operated 325). It is possible to prevent a dump and an actuator (e.g., a hydraulic cylinder) of the parka from being operated simultaneously through the interlock circuit unit 325, thereby preventing a conduction accident of the pressing tool.

R1 to R6 denote the relay (or solenoid) coils, and R1 to R6 outside the contact switch symbol (-) denote NO (Normal Open) Or NC (Normal Close) contact. And 'SOL' in the other circled symbols (○) means a solenoid valve.

The first electric signal intercepting unit 321 applies or intercepts an electric signal by combining (for example, a logical product) an initial operating state of the vehicle (e.g., whether the vehicle is in an engine start state, a parking brake state, or a gear neutral state). For example, an electrical signal is applied to the next electrical system when the vehicle engine is in a starting state, the parking brake is engaged, and the gear is in a neutral state. If any of the initial operating states of the vehicle is not satisfied, the electrical signal to be applied to the next electrical system is cut off.

The relay control unit 322 controls respective relays that transmit electric signals in accordance with the operating state of the vehicle (e.g., clutch input, accelerator pedal input, P.T.O switch input, etc.). For example, when the clutch of the vehicle is depressed, the corresponding relay R2 connected thereto is driven to open the contact R2. When the accelerator pedal of the vehicle is depressed, the corresponding relay (R3) connected thereto is driven to open the contact (R3). In addition, when the P.T.O. switch is turned off, the relay R4 is driven to open the corresponding contact R4.

Therefore, the relay controller 322 may be regarded as a vehicle operation state sensing means for sensing a vehicle operation state.

At this time, the contacts of the relays are sequentially connected in a sequential manner.

The second electric signal intercepting unit 323 combines the operation states of the respective relays (e.g., R2 to R4) and outputs an electric signal received through the first electric signal intercepting unit 321 Apply or shut off to the next electrical system. For example, when at least one of the relay contacts (R2 to R4) of the respective relays (R2 to R4) is opened, the electric signal applied to the next electric system is interrupted.

The third electric signal intercepting unit 324 is connected to each actuator (not shown) of the dump or parker by using an electric signal applied through the second electric signal intercepting unit 323 through a switch of a control box For example: control valves for dump control, control valves for parka control, etc.) for operating the hydraulic cylinders (eg hydraulic cylinders).

The third electric signal intercepting unit 324 further includes an interlock circuit unit 325 to prevent the parker from operating simultaneously during the dump operation and prevent the dump from being simultaneously activated during the parka operation so that the dump and parker actuators (For example, hydraulic cylinders) are operated at the same time. That is, when any actuator operation switch among the at least one actuator included in the hydraulic device of the vehicle is input, the electric signals applied to the control valves of the actuators are blocked to prevent the actuators of the other actuators from operating, To be operated simultaneously.

On the other hand, the states (e.g., on / off state, open / close state, etc.) of various symbols (e.g., switches, relay contacts, valves, clutches, accelerator pedals, PTO switches, It is noted that the conceptual operation of the first embodiment 320 is illustrated for easy understanding, and therefore, the state may not match the operation of the present embodiment.

In this embodiment, only the control of the dump and the parka has been described. However, the functions of the dump and the parka may be changed or added depending on the type of the specially designed vehicle.

Hereinafter, a control method of the safety control device constructed as described above will be described.

6 is a flowchart illustrating a control method of a safety control device for preventing a safety accident of a hydraulic device according to an embodiment of the present invention.

In the present embodiment, the hydraulic device of the press-contact emergency truck includes an actuator (for example, hydraulic cylinder) for raising or lowering a dump or parker, a hydraulic oil pump for generating a hydraulic pressure for controlling the hydraulic cylinder, A control valve for controlling the flow of oil discharged at a high pressure, a switch for controlling the control valve by an electric signal, and a hydraulic oil system for drawing the engine power of the vehicle using the PTO to operate the hydraulic oil pump, And an electrical system for controlling electrical signals for control.

For convenience of explanation, it is assumed that the setup for operating the hydraulic apparatus is completed. That is, when the engine is started and the parking brake is engaged, the gear (that is, the shift lever) is in the neutral state and the PTO switch is turned on in the clutch on state (i.e., the clutch is depressed) (That is, a state in which the foot put on the clutch is gradually released) to operate the hydraulic oil pump (not shown).

When the user inputs a hydraulic device operation switch (e.g., a dump operation switch, a parker operation switch) of a control box (not shown) installed in the vehicle in a state where the setup for operating the hydraulic device is completed as described above, The control method will be described.

As shown in FIG. 6, when the hydraulic device operation switch is inputted, it detects whether the input switch is a switch for operating the dump up / down (S101). If it is a specially designed vehicle that performs another function, the switch may be a switch for activating the corresponding function. That is, since the dump function is included in addition to the parka function, the dump operation switch according to the present embodiment detects whether the dump operation switch is inputted.

On the other hand, the operation when the dump operation switch is input is the same as the operation when the parka opening switch is inputted. Therefore, for the sake of convenience of explanation, when the dump operation switch is inputted, As shown in FIG.

Next, it is determined whether the input switch is a parka open switch (S102).

When the parka opening switch is input as described above, the operation of the hydraulic oil pump is sensed (S103). For example, the operation sensing of the hydraulic oil pump senses whether the pump is in an operating state and the number of revolutions of the pump when the pump is in an operating state. In addition, it checks the operating state of the vehicle (e.g., whether or not the clutch is input, whether or not the P.T.O switch is input) (S104).

If the operation of the pump is not sensed, the operation of the hydraulic device is stopped. That is, the electric signal flowing to the electric system is blocked, thereby preventing a safety accident due to a dropping of the parka which may occur when the parka opening switch is re-inputted in the operating state of the vehicle.

Then, it is detected whether the accelerator is operating (S105).

At this time, whether the accelerator is operated or not depends on the RPM differential method. For example, the rotational speed (RPM) during operation of the hydraulic oil pump (not shown), and detects whether or not the rotational speed is equal to or greater than a preset rotational speed. That is, even if the accelerator is operated, if the rotational speed of the hydraulic oil pump is smaller than the preset rotational speed, it is determined that the normal operation is performed.

If the operating speed of the hydraulic oil pump is higher than a predetermined speed by the operation of the accelerator, the operation of the hydraulic device is stopped. That is, the electric signal flowing to the electric system is blocked to prevent a safety accident due to a sudden rise in the parka, which may occur due to an increase in the hydraulic pressure in the operating state of the vehicle.

When the operating state of the vehicle (for example, whether or not the clutch is input, whether or not the PTO switch is input) matches the predetermined stable condition and the accelerator operation (or the rotational speed of the hydraulic oil pump) , An electric signal corresponding to the parka opening switch input is applied to actuate the control valve 110 (S106). That is, the hydraulic cylinder (not shown) is operated corresponding to the input of the parka opening switch to lift the parka.

Next, it is determined whether the input switch is a parker closing switch (S107).

Even if the parka closing switch is re-inputted in a state in which the parka is closed, a safety accident does not occur. When the parka closing switch is inputted in the parked state (that is, when the parka is raised), the oil is discharged through the hydraulic oil discharge valve 120 at a normal speed (S108).

At this time, the hydraulic oil drain valve 120 can manually adjust the flow rate. That is, the parker descending speed desired by the user can be set. In other words, the parka can be always lowered at a constant speed by the set flow rate.

As described above, even when the dump is operated, the operation state of the vehicle (for example, whether or not the clutch is input, whether or not the PTO switch is input) does not meet the predetermined stability condition while the dump is raised, The number of revolutions) does not meet the predetermined stable condition, the electric signal is cut off to prevent a safety accident due to the sudden drop of the dump or the sudden rise of the dump.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, I will understand the point. Accordingly, the technical scope of the present invention should be defined by the following claims.

110: Control valve 120: Hydraulic oil drain valve
210: Hydraulic oil backflow prevention valve 300: Safety control device
310: pump operation detecting unit 320: electric signal blocking unit
321: first electric signal blocking unit 322: relay control unit
323: second electric signal blocking unit 324: third electric signal blocking unit
325: interlock circuit part 330: pump rotation speed detector
340:

Claims (10)

delete In an electric system of a hydraulic apparatus for a press-
A pump operation detecting unit for detecting whether the hydraulic oil pump is operated;
An electric signal blocking unit for blocking an electric signal applied to the load side valve when the hydraulic oil pump is not operated;
A pump rotational speed detector for detecting rotational speed of the hydraulic oil pump during operation; And
And a control unit for controlling the electric signal blocking unit to shut off the electric signal transmitted to the load side valve when the number of revolutions or the number of revolutions after a predetermined time becomes equal to or greater than a predetermined number of revolutions Including,
Wherein the electric signal blocking unit comprises:
When the vehicle's clutch is depressed, when the accelerator pedal of the vehicle is depressed for a predetermined depth or more, when the hydraulic oil pump is not operated, when the rotation speed of the hydraulic oil pump is equal to or greater than a predetermined rotation speed, Wherein the control unit controls the control unit to shut off the electric signal applied to the load side valve.
delete 3. The apparatus according to claim 2,
A first electric signal blocking unit for applying or blocking an electric signal to a next electric system by combining an engine start state, a parking brake operation state, and a gear neutral state of the vehicle;
A relay control unit for controlling a corresponding relay for transmitting an electric signal in accordance with whether or not the vehicle is inputting a clutch, inputting an accelerator pedal, or inputting a PTO switch;
A second electrical signal blocking unit for applying or blocking the electrical signal to the next electrical system by combining the operating states of the relays;
A third electric signal blocking part for receiving or inputting the electric signal to each of the control valves for actuating the actuators, And
And an interlock circuit part for preventing operation of another actuator when the actuator is operated by the hydraulic device operation switch.
The apparatus of claim 4, wherein the first electric signal blocking unit comprises:
The electric signal is switched to the next electric power when the vehicle engine is started, the parking brake is engaged, and the gear is in the neutral state by logically multiplying the engine start state, the parking brake operation state, System,
And when it is determined that any one of the operating states is not satisfied, the electrical signal to the next electrical system is cut off.
5. The apparatus according to claim 4,
And sequentially connecting the contacts of the relays in a sequence connection manner,
Wherein when the relay contact of any one of the relays is opened, the electric signal applied to the next electric system is cut off, .
In an electric system of a hydraulic apparatus for a press-
Sensing whether the hydraulic oil pump is operating;
Detecting rotation speed of the hydraulic oil pump during operation; And
And blocking the electric signal transmitted to the load side valve when the difference in the number of revolutions or the number of revolutions after a predetermined time becomes equal to or greater than a predetermined number of revolutions,
The step of interrupting the electrical signal comprises:
When the vehicle's clutch is depressed, when the accelerator pedal of the vehicle is depressed for a predetermined depth or more, when the hydraulic oil pump is not operated, when the rotation speed of the hydraulic oil pump is equal to or greater than a predetermined rotation speed, Wherein the electric signal applied to the load side valve is cut off when at least one of the load side valve and the load side valve is closed.
delete 8. The method of claim 7, wherein blocking the electrical signal comprises:
The vehicle is judged to satisfy any one of whether the engine is started, whether the vehicle is parked, whether the vehicle is parked, and whether the vehicle is in a neutral state. The electric signal to the next electric system is shut off when the electric signal is not applied to the next electric system.
8. The method of claim 7,
And blocking an electric signal applied to a control valve of the actuator to prevent operation of another actuator when one of the actuators of the at least one actuator included in the hydraulic apparatus is input Wherein said hydraulic control unit is operable to control said hydraulic control unit.

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