KR20180108837A - Emergency operation valve and unloading circuit - Google Patents

Emergency operation valve and unloading circuit Download PDF

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Publication number
KR20180108837A
KR20180108837A KR1020187026482A KR20187026482A KR20180108837A KR 20180108837 A KR20180108837 A KR 20180108837A KR 1020187026482 A KR1020187026482 A KR 1020187026482A KR 20187026482 A KR20187026482 A KR 20187026482A KR 20180108837 A KR20180108837 A KR 20180108837A
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South Korea
Prior art keywords
valve
chamber
hydraulic
flow path
emergency operation
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KR1020187026482A
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Korean (ko)
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KR101942229B1 (en
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토모카즈 고토
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가부시기가이샤다다노
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/18—Control systems or devices
    • B66C13/20—Control systems or devices for non-electric drives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/36—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor
    • F16K31/363—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor the fluid acting on a piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Analytical Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Automation & Control Theory (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Component Parts Of Construction Machinery (AREA)
  • Fluid-Driven Valves (AREA)
  • Mechanically-Actuated Valves (AREA)
  • Safety Valves (AREA)

Abstract

A valve for an emergency operation valve capable of selectively switching between an opened state and a closed state, comprising: a valve box having a cavity in a valve chamber; a first flow path formed in the valve box and being a flow path for operating fluid supplied to the valve chamber; And a second position in which the first flow path is communicated with the second flow path and a second position in which the first flow path is blocked from the second flow path, And a resilient member pressing the pressure receiving portion in a direction from the second position toward the first position.

Figure P1020187026482

Description

Emergency operation valve and unloading circuit

The present invention relates to an emergency operation valve and an unloading circuit. More particularly, the present invention relates to an emergency operation valve and an unloading circuit used in a hydraulic working machine such as a truck-mounted crane.

Truck-mounted cranes are equipped with a mechanical structure for lifting and lowering the hooks from the tip of a crane boom by a winch to a winch, and a hydraulic circuit for driving the winch. Since the hook or the boom is damaged when the hook is wound excessively, the hydraulic circuit is provided with an unloading circuit for stopping the winch drive. The over-winding-proof device of the so-called hook includes such an unloading circuit.

As shown in Patent Documents 1 and 2, the configuration of the unloading circuit is constituted by a relief valve and an electromagnetic (electromagnetic) opening / closing valve interposed in the pilot circuit of the relief valve. Such an unloading circuit is configured to unload or load the operating oil by adding / canceling the pilot pressure by the electromagnetic opening / closing valve.

However, the unloading circuits of Patent Documents 1 and 2 constitute an anti-theft device and do not constitute a device for preventing over-hooking of a hook.

An unloading circuit 100 constituting a device for preventing overcraft of a hook in a truck loading crane will be described with reference to Fig. The hydraulic oil discharged by the hydraulic pump 101 is supplied to the respective hydraulic actuators through the supply passage 102. On the other hand, the hydraulic fluid discharged from each of the hydraulic actuators is returned to the tank 104 through the discharge passage 103.

A relief valve 105 is interposed between the supply passage 102 and the discharge passage 103. The relief valve 105 is closed when the pressure of the spring is combined with the pilot pressure, and the hydraulic fluid flows into the supply passage 102, and the valve is in an on-load state. On the other hand, the relief valve 105 is changed when the pilot pressure disappears. When the relief valve 105 is opened, the hydraulic fluid in the supply passage 102 is directly discharged to the discharge passage 103, and is in an unloaded state not supplied to the hydraulic actuators.

An electromagnetic opening / closing valve 106 is provided for switching the supply / discharge of the pilot pressure.

In the truck-mounted crane, a limit switch 109 (limit switch) for detecting the overcurrent of the hook is provided at the front end of the boom. When the limit switch 109 detects the overcurrent of the hook, the electromagnetic on-off valve 106 is opened to release the pilot pressure. Then, the relief valve 105 is opened, and the driving of the winch motor is stopped.

However, when a disconnection occurs in the electrical system for detecting the overcurrent of the hook, the electromagnetic on-off valve 106 is maintained in a modified state by a spring. Because of this, the relief valve 105 also remains in the opened state, and the crane can not be operated.

Thus, conventionally, as shown in Fig. 7, a manual on / off valve 120 is mounted in series with respect to the electromagnetic on / off valve 106 as an emergency operation valve. When the emergency operation valve 120 is closed, the relief valve 105 is also closed. Then, the hydraulic oil is loaded on the supply passage 102, and the crane can be operated.

However, the conventional emergency operation valve 120 is configured as shown in Fig. In the valve box 121, a pump-side passage 122 and a tank-side passage 123 are formed. A valve chamber 124 is formed at a position where the pump side passage 122 and the tank side passage 123 intersect with each other and a valve body 125 is inserted. The valve body 125 is threaded so that the male screw of the valve body 125 is engaged with the female screw 126 formed on the valve box 121. The pump side passage 122 and the tank side passage 123 are communicated with each other by moving the valve body 125 forward and backward by inserting a screwdriver into the concave groove 127 formed in the head portion of the valve body 125, Or shut down.

In the emergency operation valve 120, when the valve body 125 is screwed, the pump side passage 122 and the tank side passage 123 are disconnected, and the pilot pressure is continuously supplied to the relief valve 105 shown in FIG. Can be added. However, since the emergency operation valve 120 is a manual operation, it is stored. Unless it is released, the winch motor continues to be operable. If the winch motor continues to operate, the hook may be damaged by overcurrent.

Japanese Patent Application Laid-Open No. 2008-137454 Japanese Patent Application Laid-Open No. 2009-154740

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide an emergency operation valve and an unloading circuit using the emergency operation valve.

One aspect of the emergency operation valve according to the present invention is an emergency operation valve capable of alternately switching between an opened state and a closed state, comprising: a valve box having a valve chamber of a hollow shape; A first flow path that is a flow path of the operating fluid supplied to the valve chamber, a second flow path that is a flow path of the working fluid formed in the valve box and discharged from the valve chamber, and a second flow path that communicates the first flow path with the second flow path A pressure receiving portion disposed in the valve chamber in such a manner as to be capable of being displaced between a first position in which the first flow path is blocked and a second position in which the first flow path is blocked from the second flow path, And the elastic member pressing the pressure receiving portion in the direction of the arrow.

An unloading circuit according to the present invention is an unloading circuit used in a hydraulic circuit of a hydraulic working machine. The unloading circuit includes a relief valve interposed between a supply passage connected to a pump and a discharge passage connected to a tank, And a pilot pressure control valve for controlling the diaphragm of the pilot pressure to the relief valve. The pilot pressure control valve includes the above-described emergency operation valve.

According to one embodiment of the vehicle and the unloading circuit according to the present invention, the possibility of disengagement can be reduced.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a structural explanatory view of an emergency operation valve according to an embodiment of the present invention, wherein FIG. 1A is a modified state and FIG. 1B is a closed state.
2 is a circuit diagram of an unloading circuit according to an embodiment of the present invention.
[Fig. 3] Fig. 3a is an explanatory view of the operation of the emergency operation valve in the non-operation state, and Fig. 3b is an explanatory diagram of the operation of the unloading circuit when the emergency operation valve is in the non-operation state.
Fig. 4A is an explanatory view of the operation of the emergency operation valve operated by hand, and Fig. 4B is an explanatory diagram of the operation of the unloading circuit in a state in which the emergency operation valve is manually operated.
5A is an explanatory view of the operation of the automatically maintained emergency operation valve, and FIG. 5B is an explanatory diagram of the operation of the unloading circuit in a state where the emergency operation valve is automatically held.
6A is an explanatory view of the operation of the automatic return valve, and FIG. 6B is an explanatory view of the operation of the unloading circuit in a state in which the emergency operation valve is automatically returned.
7 is a circuit diagram of a conventional unloading circuit.
8 is a sectional view of a conventional emergency operation valve.

Hereinafter, an emergency operation valve according to an embodiment of the present invention will be described with reference to the drawings.

<1. For the emergency operation valve (A)>

First, the emergency operation valve A will be described based on Fig. In Fig. 1, the description will be made assuming that one direction is the upper direction and the other direction is the lower direction.

First, the outline of the emergency operation valve A will be described. The emergency operation valve according to the present embodiment is an emergency operation valve capable of selectively switching between the opened state and the closed state. The emergency operation valve includes a valve box (for example, A first passage (for example, a pump-side passage 17 described later) that is formed in the valve box and is a passage for the hydraulic oil supplied to the valve chamber, (For example, a tank side passage (18) described later) that is a flow path of hydraulic oil that is formed in the valve box and discharged from the valve chamber, and a second passage (For example, the position of the pressure-receiving portion 15 in Fig. 1A) and a second position for blocking the first flow path from the second flow path (for example, the position of the pressure receiving portion 15 in Fig. 1B) (For example, a hydraulic pressure portion 15 described later) disposed in the valve chamber in a displaceable state, (For example, a spring 16 described later) that presses the pressure receiving portion in a direction from the second position toward the first position (for example, upward of Figs. 1A and 1B).

Next, the specific configuration of the emergency operation valve A will be described. In Fig. 1A, the valve box 11 is formed with a valve chamber 12 which is a cylindrical cavity. A valve body (13) is inserted into the valve chamber (12) so as to reciprocate. 1A and 1B) in the reciprocal motion of the valve body 13 is referred to as a first direction and the other direction (downward in FIGS. 1A and 1B) is referred to as a second direction .

In the following description, the unloading state of the emergency operating valve A is an opened state of the emergency operating valve A. On the other hand, the on-load state of the emergency operation valve A is a state of the emergency operation valve being closed. The unloading state of the unloading circuit is a state in which the working oil can pass through the relief valve 5 (see FIG. 2) of the unloading circuit (that is, the opened state of the relief valve 5). On the other hand, the on-load state of the unloading circuit means that the operating oil can not pass through the relief valve 5 of the unloading circuit (that is, the closed state of the relief valve 5). The unloading state of the hydraulic circuit in which the unloading circuit is incorporated is a state in which the hydraulic fluid is not supplied to the hydraulic actuator of the hydraulic working machine. On the other hand, the on-load state of the hydraulic circuit in which the unloading circuit is incorporated is a state in which hydraulic oil is supplied to the hydraulic actuator of the hydraulic working machine.

The valve body 13 is composed of a round rod-shaped valve rod 14 and a flange-shaped hydraulic pressure portion 15 formed at the middle portion of the valve rod 14. The pressure receiving portion 15 is a member having a larger diameter than the valve rod 14. [ On the upper surface (that is, the surface on the first direction side) of the pressure receiving portion 15, a pressure receiving surface that receives the pressure of the operating oil is formed. On the other hand, a spring-side pressure receiving surface receiving a spring pressure of a spring 16 described later is formed on the lower surface (i.e., the surface in the second direction) of the hydraulic pressure portion 15. When the pressure receiving portion 15 receives the pressure of the operating oil, the valve body 13 can be pushed down to the second direction side (the other end side, the lower side in Fig. 1A).

The pressure receiving portion 15 has the valve chamber 12 vertically divided into two portions. A space in the valve chamber 12 which becomes a first direction side (one side of the upper side in Figs. 1A and 1B) than the pressure receiving portion 15 is referred to as a hydraulic pressure chamber 12a. On the other hand, a space in the valve chamber 12 which becomes the second direction side (the lower side in Figs. 1A and 1B) than the pressure receiving portion 15 is called a spring chamber 12b. That is, the pressure receiving portion 15 divides the valve chamber 12 by the hydraulic pressure chamber 12a which is the first chamber and the spring chamber 12b which is the second chamber.

The volume of the hydraulic pressure chamber 12a and the spring chamber 12b varies in accordance with the reciprocating motion of the pressure receiving portion 15. [ 1A, the volume of the hydraulic pressure chamber 12a is the smallest and the volume of the spring chamber 12b is the smallest in the state in which the hydraulic pressure portion 15 is displaced toward the first direction side of the valve chamber 12 .

In the spring chamber 12b, a spring 16, which is an example of an elastic member, is disposed. The upper end of the spring 16 is in contact with the lower surface of the water pressure portion 15 (i.e., the spring-side water pressure surface). The lower end of the spring 16 is in contact with the end face of the inner surface of the valve box 11 in the second direction (the lower side in Figs. 1A and 1B). In this state, the spring 16 presses and presses the valve body 13 toward the first direction side (the upper side in Figs. 1A and 1B). The type of the elastic member and the position of the elastic member are not limited to the case of this embodiment.

A pump side passage (17) and a tank side passage (18) are formed in the valve box (11). The pump-side passage (17) is formed between the central portion of the valve chamber (12) and the end portion on the first direction side. In other words, the pump-side passage 17 is formed in such a manner that the valve element 13 is displaced to the end in the first direction by the spring pressure of the spring 16, 1a and the lower side of Fig. 1B).

The tank side passage 18 is formed at the end of the valve chamber 12 in the second direction (the lower end in Figs. 1A and 1B). The valve body 13 is displaced to the end in the first direction by the spring pressure of the spring 16 so that the pump side passage 17 and the tank side passage 18 are in contact with the pressure receiving portion 15 And becomes the second direction. In other words, the pump side passage 17 and the tank side passage 18 communicate with the spring chamber 12b of the valve chamber 12 in the state where the emergency operation valve A is in the opened state. Between the valve rod 14 and the valve box 11, there is provided a packing 19 for liquid-tightly sealing the valve chamber 12.

The pressure receiving portion 15 of the valve element 13 is pushed up in the first direction by the spring 16 and is pushed toward the first direction side (upward in Fig. 1A) from the pump side passage 17 as shown in Fig. 1A In the inclined state, the pump side passage 17 and the tank side passage 18 communicate with each other. This state is an opened state of the emergency operation valve A.

On the other hand, as shown in Fig. 1B, when the valve body 13 is manually depressed so that the pressure receiving portion 15 descends downward from the pump side passage 17, the hydraulic chamber 12a ). When the hydraulic fluid in the hydraulic chamber 12a is full, the valve element 13 is pressed down by the pressure received by the hydraulic pressure portion 15. Further, the operation of depressing the valve body 13 is not limited to the case where the valve body 13 is directly depressed by a person. Further, the main body for pressing down the valve body 13 is not limited to a person. For example, the valve body 13 may be mechanically depressed by a computer-controlled robot or the like.

Even when the pressing operation of the valve body 13 is stopped (that is, even when the force applied to the valve body 13 is removed artificially) in the state in which the valve body 13 is depressed, / RTI &gt; This function is called automatic maintenance function. While this automatic maintenance function is in operation, the pump side passage 17 and the tank side passage 18 are shut off. This state is a state in which the emergency operation valve A is closed.

On the other hand, when the hydraulic oil supply to the pump-side passage 17 is cut off for any reason (for example, by stopping the pump), the pressing force of the hydraulic pressure portion 15 is eliminated, 13 is pushed up to the first direction side (the upper side in Fig. 1B), and the state returns to the state of Fig. 1A. This function is called automatic return function. The pump-side passage 17 and the tank-side passage 18 are communicated again.

Since the emergency operation valve A of the present invention has the above-described automatic return function, it is possible to prevent the user from forgetting to return to the normal state after the emergency action is completed.

<2. For the unload circuit B>

Next, an embodiment in which the emergency operation valve A is applied to the unloading circuit of the truck loading type crane, which is an example of the hydraulic working machine, will be described. First, a circuit configuration around the unloading circuit B will be described with reference to Fig.

2 shows the hydraulic pump 1, the hydraulic oil supply passage 2, the hydraulic oil discharge passage 3, and the tank 4.

An angle actuator for a crane is connected to the supply passage 2 and the discharge passage 3 via an operation valve unit 20. 2, a winch motor 21, a boom lifting cylinder 22 and a boom stretching cylinder 23 are shown, but there are various other hydraulic actuators not shown. In the hydraulic circuit having the basic configuration as described above, the unloading circuit B of the present invention is provided between the supply passage 2 and the discharge passage 3.

Hereinafter, the unloading circuit B will be described in detail. The hydraulic pump 1 uses an engine or the like of a vehicle as a drive source. When the engine is driven and the power take-off device is turned ON, the engine power is transmitted to the hydraulic pump 1, and the hydraulic pump 1 is in the operating state. When the power take-off device is turned OFF or when the engine is stopped, the hydraulic pump 1 is put in a stopped state.

The supply flow path 2 supplies the hydraulic fluid discharged by the hydraulic pump 1 to the respective hydraulic actuators such as the winch motor 21, the boom relief cylinder 22 and the boom stretch and shrink cylinder 23. The hydraulic fluid discharged from each hydraulic actuator is returned to the tank 4 through the discharge passage 3. The unloading circuit B includes a flow path 7 connecting the supply flow path 2 and the discharge flow path 3 and a relief valve 5 mounted on the flow path 7.

The relief valve 5 is provided with a pilot circuit 5a which pressurizes in the opening direction, a spring 5b which pressurizes in the closing direction, and a pilot circuit 5c. The pilot circuit 5a and the pilot circuit 5c are supplied with the pilot pressure from the flow path 7 together.

When the pressure Pa of the pilot circuit 5a is smaller than the sum of the sum of the spring pressure of the spring 5b and the pilot pressure of the pilot circuit 5c, the relief valve 5 is closed . When the relief valve 5 is in the closed state, the hydraulic oil is supplied to each of the hydraulic actuators without unloading. Then, the hydraulic working machine operates.

However, when the pressure of the pilot circuit 5c is removed, the pressure Pa and the pressure Pb are balanced and changed (the state of the relief valve 5 shown in Fig. 3B). In this case, the hydraulic fluid discharged by the hydraulic pump 1 is returned (that is, unloaded) to the discharge flow path 3 via the flow path 7 and the relief valve 5. Therefore, the hydraulic oil is not supplied to the respective hydraulic actuators, and the hydraulic working machine is not operated.

A pilot control circuit 8 is provided between the pilot circuit 5c of the relief valve 5 and the discharge flow path 3. The pilot control circuit 8 is provided with an electromagnetic opening / closing valve 6 and an emergency operation valve A interposed therebetween in series.

The electromagnetic on-off valve 6 and the emergency operation valve A can switch the supply and the discharge of the pilot pressure to the pilot circuit 5c of the relief valve 5 together. When the pilot pressure is supplied to the pilot circuit 5c of the relief valve 5, the relief valve 5 is closed. On the other hand, when the pilot pressure is removed from the pilot circuit 5c, the relief valve 5 is changed. The unloading state and the on-load state of the unloading circuit B are switched by opening / closing switching of the electromagnetic opening / closing valve 6 and the emergency operating valve A as described above.

The electromagnetic opening / closing valve 6 is used in normal operation and operates based on a signal from the switch 9 of the overcurrent protection device of the hook. On the other hand, the emergency operation valve A is provided in the pilot control circuit 8 for emergency response in the event that a communication line between the switch 9 and the electromagnetic opening / closing valve 6 is broken. Such an emergency operation valve A is manually operated.

<2. 1 Operation of the unloading circuit (B)>

Hereinafter, the operation of the unloading circuit B will be described with reference to Figs. 3 to 6. Fig. In the following description, it is assumed that the solenoid drive current is not energized to the solenoid-operated valve 6 for reasons such as disconnection, and the solenoid-operated valve 6 is maintained in the opened state by the spring.

<2. 1. 1 Non-operation>

Fig. 3A shows a state in which the emergency operation valve A is not depressed (in other words, an opened state). The pressure receiving portion 15 is located at the end in the first direction in the valve chamber 12 by pushing the spring 16 in the state of the emergency operation valve A being in the opened state. The pump side passage 17 and the tank side passage 18 communicate with each other as indicated by an arrow y.

The state of modification of the emergency operation valve A will be described in detail with reference to Fig. Since the pressure receiving portion 15 is located at the end of the valve chamber 12 in the first direction (the upper side in Fig. 3A) due to the urging of the spring 16 in the state of the emergency operation valve A being opened, The volume of the hydraulic pressure chamber 12a is smaller than that of the hydraulic pressure chamber 12a in the manual pressing operation state and the automatic holding state described later.

On the other hand, the volume of the spring chamber 12b in the state of the emergency operation valve A is larger than that of the hydraulic pressure chamber 12a in the manual pressing state and the automatic holding state described later.

The pump side passage 17 and the tank side passage 18 communicate with the spring chamber 12b when the emergency operation valve A is in the opened state. The pump side passage 17 and the tank side passage 18 communicate with each other via the spring chamber 12b in the state where the emergency operation valve A is in the opened state.

The emergency control valve A in the unloading circuit B is represented by the hydraulic symbol in the case where the emergency operation valve A is in the modified state as shown in Fig. 3). As a result, the pilot pressure is released from the relief valve 5, and the relief valve 5 is brought into a modified state.

In this case, as shown by the arrow Xa in Fig. 3B, the operating oil is brought into the unloaded state from the supply passage 2 to the discharge passage 3 via the oil passage 7 (see Fig. 2). That is, in the unloaded state, since the hydraulic oil is not supplied to the hydraulic actuators, the hydraulic actuators of the hydraulic working machine are not driven. As a result, accidents such as overheating of the hook are prevented.

<2. 1. 2 Manual push operation>

After the hook is overturned, the hook must be pulled or the boom must be moved to the retracted position. For this reason, it is necessary to put the entire hydraulic circuit in an on-load state. Thus, as shown in Fig. 4A, the crane operator pushes the valve body 13 of the emergency operation valve A by hand. Specifically, the crane operator presses one end (upper end in Fig. 3A) of the valve rod 14 in the second direction (downward in Fig. 3A).

Then, the water pressure portion 15 moves together with the valve rod 14 in the second direction, and the emergency operation valve A becomes a state shown in Fig. 4A (hereinafter referred to as &quot; closed state &quot;). As a result, the pump side passage (17) and the tank side passage (18) are blocked by the pressure receiving portion (15). Further, the valve body 13 of the emergency operation valve A may be directly pushed by hand, for example, through a machine or the like.

The state of the emergency operation valve A being closed will be described in detail with reference to FIG. The pressure receiving portion 15 is located at the substantially central portion of the valve chamber 12 in the state of the emergency operation valve A being closed. In this state, the pump-side passage 17 communicates with the hydraulic pressure chamber 12a. On the other hand, the tank side passage 18 communicates with the spring chamber 12b. Therefore, in the state in which the emergency operation valve A is closed, the pump side passage 17 and the tank side passage 18 are not communicated with each other.

When the emergency operation valve A is in the closed state, the emergency operation valve A in the unloading circuit B is represented by the hydraulic symbol, as shown in Fig. 4B, and the pilot control circuit 8 is closed. As a result, the pilot pressure from the pilot circuit 5c is added to the relief valve 5 in addition to the spring pressure, so that the relief valve 5 is closed. In this case, as indicated by the arrow Xo in Fig. 4B, the operating oil is in an on-load state to be sent from the supply passage 2 to each of the hydraulic actuators. As a result, the holding operation of the hook and the boom can be performed.

<2. 1. 3 Automatic Maintenance Status>

Incidentally, when the hook of the hook or the containment operation of the boom is performed, the crane operator must operate the crane by the other hand while the emergency operation valve A is being held by the hand of the unilateral.

5A shows a state in which the crane operator has stopped pushing the hand off the valve body 13. The pressure of the hydraulic fluid flowing into the hydraulic pressure chamber 12a from the pump side passage 17 pushes the hydraulic pressure portion 15 down and holds the valve body 13, The passage 18 is maintained in the blocked state. In other words, the emergency state of the emergency operation valve A is automatically maintained.

In other words, in the state shown in Fig. 5A, the pressure applied to the pressure receiving portion 15 in the second direction (downward in Fig. 5A) based on the pressure of the operating oil in the hydraulic pressure chamber 12a And a force (hereinafter referred to as a second pressing pressure) that the pressure receiving portion 15 is pressed in the first direction (upward in FIG. 5A) is balanced based on the elastic force of the spring 16. Therefore, the position of the pressure receiving portion 15 is held at the position shown in Fig. 5A (i.e., the second position). In the case of the present embodiment, it is a predetermined condition that the first pressure and the second pressure are balanced.

When the pilot pressure of the pilot circuit 5c is maintained in the spring pressure of the spring 5b in the relief valve 5, the relief valve 5 is maintained in the closed state. That is, when viewed from the hydraulic circuit shown in Fig. 5B, the on-load state in which the operating oil is sent from the supply flow passage 2 to each of the hydraulic actuators (see arrow Xo in Fig. 5B) is maintained. Thereby, the crane operator can continue the depression of the hook and the containment of the boom.

<2. 1. 4 Auto return>

The emergency operation valve A according to the present embodiment automatically returns from the closed state to the opened state. Hereinafter, automatic return of the emergency operation valve A will be described. The crane operator stops the engine of the vehicle when the containment operation of the boom is completed. When the engine stops, the rotation of the hydraulic pump 1 is stopped, and the hydraulic oil is not discharged from the hydraulic pump 1. [ Then, the pressure is released from the hydraulic pressure chamber 12a of the emergency operation valve A, and the first pressure pressure becomes smaller than the second pressure pressure. As a result, as shown in Fig. 6A, the valve body 13 is displaced in the first direction (upward in Fig. 6B) by the urging of the spring 16 (i.e., the second pressing pressure). The pressure receiving portion 15 is positioned on the first direction side (upper side in Fig. 6B) than the pump side passage 17 and the pump side passage 17 and the tank side passage 18 communicate with each other. In this way, the emergency operation valve A automatically returns from the closed state to the opened state.

As described above, when the emergency operation valve A is automatically returned, the pilot pressure is released from the relief valve 5 and the relief valve 5 is changed. When the relief valve 5 is opened, the operating oil becomes an unloaded state from the supply passage 2 to the discharge passage 3 as indicated by the arrow Xa in Fig. Therefore, unintentional movement of the hook or boom can be prevented even when the hydraulic pump 1 is restarted, for example, by starting the engine of the vehicle. Thereby, unexpected accidents can be prevented.

In the above-described embodiment, the unloading circuit B is constructed using the emergency operation valve A and the electromagnetic opening / closing valve 6. [ However, the unloading circuit may be composed only of the emergency operation valve A.

The emergency operation valve A according to the present embodiment is not limited to the overcurrent prevention device but may be applied to an unloading circuit incorporated in another device having a function of stopping the operation of the crane (for example, an overload prevention device) It can also be applied.

<3. Regarding the operation and effect of the present embodiment,

According to the present embodiment, the following actions and effects can be obtained.

First, the emergency operation valve A according to the present embodiment automatically returns from the closed state to the opened state as described above. Specifically, when the hydraulic oil is not supplied from the pump side passage 17 to the hydraulic pressure chamber 12a due to the stoppage of the hydraulic pump 1 or the like in the closed state shown in Figs. 4A and 5A, The pressure exerted by the pressure receiving portion 15 from the operating oil in the oil passage 12a decreases. Then, the valve body 13 (specifically, the pressure receiving portion 15) is displaced by the spring 16 in the first direction (upward in FIGS. 4A and 5A) from the position of the closed state. As a result, the pressure receiving portion 15 is displaced to the end portion (the upper end of Figs. 4A and 5B) of the valve chamber 12 in the first direction and the pump side passage 17 and the tank side passage 18 are displaced in the spring chamber 12b ). That is, the emergency operation valve A returns to the modified state shown in Fig. 6A without operating the valve body 13 by an artificial force. As described above, the emergency operation valve A of the present embodiment automatically returns from the closed state to the opened state, so that the emergency operation valve A is not released.

The unloading circuit B according to the present embodiment is provided with the emergency operation valve A as described above. Therefore, when the hydraulic pump 1 stops due to the stop of the engine or the like of the hydraulic working machine, the emergency operation valve A automatically returns from the closed state to the opened state. With such an automatic return of the emergency operation valve A, the hydraulic circuit in which the unloading circuit B is incorporated is switched from the on-load state to the unloading state. As described above, according to the unloading circuit (B) of the present embodiment, since the emergency operation valve A is not forgotten to be released, the hydraulic working machine does not operate as desired and an accident can be prevented.

<4. Bookkeeping>

As a reference example of the emergency operation valve, an emergency operation valve that alternately switches the flow passage from the open state to the closed state is provided in the valve body. The valve body includes a valve chamber in the form of a cavity formed in the valve body, And a tank side passage which is formed in the valve box and which communicates with one end side of the valve chamber and which communicates with the other end side of the valve chamber, The valve body has a pressure receiving portion that receives a pressure of hydraulic oil flowing from the pump side passage and generates a force in a direction to push back the spring. When the valve body is artificially pressed against the spring to the other end side, The passage is blocked and the state is maintained by the force generated by the pressure receiving portion even if the pressing operation is stopped, and there is no pressure in the pump side passage When the slide has been naejyeo valve body by a spring toward the end it can be configured to communicate with the pump-side passage and the tank-side passage.

According to the above-mentioned reference example of the emergency operation valve, when the valve body is artificially pressed against the spring, the water pressure portion receives the pressure of the operating oil supplied from the pump side passage, and the valve body keeps the spring in a compressed state. It is possible to keep the pump side passage and the tank side passage blocked. In addition, while the pressure receiving portion of the valve body receives the operating oil pressure, the pump side passage and the tank side passage can be automatically shut off even if the artificial pressing operation is stopped. When the hydraulic fluid is not supplied from the pump side passage due to the stoppage of the pump or the like, the pressure received by the pressure receiving portion decreases and the valve body is pressed by the force of the spring, so that the pump side passage and the tank side passage are automatically returned . Therefore, release of the emergency operation valve is not forgotten.

As an example of the unloading circuit, the unloading circuit in the hydraulic circuit of the hydraulic working machine is constituted by a relief valve mounted between a supply passage connected to the pump and a discharge passage connected to the tank, And a pilot pressure control valve for controlling the diaphragm pressure, and the pilot pressure control valve may be constructed using the emergency operation valve of the above-mentioned reference example.

According to the above-mentioned reference example 1 of the unloading circuit, when the emergency operation valve is depressed to leave the pump side passage and the tank side passage blocked, the relief valve receives the pilot pressure and maintains the shutoff state and the working oil is supplied to the hydraulic working machine side , The hydraulic working machine operates normally. When the engine or the like of the hydraulic working machine is stopped, the pump is also stopped and the pressure of the pump side passage is eliminated, so that the valve body of the emergency operation valve is in a state of being pressurized by the spring, thereby communicating the pump side passage and the tank side passage. In this way, since it is not forgotten to return the emergency operation valve, the hydraulic working machine does not operate freely and an accident can be prevented.

In the unloading circuit of Reference Example 1 described above, the pilot pressure control valve is constituted by an electromagnetic opening / closing valve and a manual opening / closing valve mounted in series with the pilot circuit, May be the emergency operation valve of the above-mentioned reference example.

According to Referential Example 2 of the above-described unloading circuit, in the normal state, opening and closing of the relief valve is controlled by the electromagnetic opening / closing valve to prevent overheating of the hook, but breakdown of the electrical system connected to the electromagnetic opening / , The opening and closing of the relief valve is controlled by the manual emergency operation valve. Furthermore, even if the emergency operation valve is forgotten to be disengaged, the hydraulic working machine does not operate freely, so that an accident can be prevented.

The disclosures of the specification, drawings and abstract included in the Japanese application of Japanese Patent Application No. 2016-076332 filed on April 6, 2016 are all incorporated herein by reference.

1: Hydraulic pump
2: Supply flow
3: Discharge channel
5: relief valve
6: Electronic opening / closing valve
8: Pilot control circuit
11: Valve box
12: Valve chamber
13:
14:
15:
16: spring
17: pump side passage
18: tank side passage
A: Emergency operation valve
B: Unloading circuit

Claims (8)

As an emergency operation valve capable of selectively switching between an opened state and a closed state,
A valve box having a cavity in a valve chamber;
A first flow path formed in the valve box and being a flow path of hydraulic fluid supplied to the valve chamber,
A second flow path formed in the valve box and being a flow path of hydraulic fluid discharged from the valve chamber,
A pressure receiving portion disposed in the valve chamber in such a manner as to be displaceable between a first position for communicating the first flow path with the second flow path and a second position for shutting off the first flow path from the second flow path, Wealth,
And an elastic member pressing the pressure receiving portion in a direction from the second position toward the first position.
Emergency operated valve. The method according to claim 1,
Wherein the valve chamber is divided into a first chamber and a second chamber by the pressure receiving portion and the first passage communicates with the first chamber in a state in which the pressure receiving portion is in the second position, And the second chamber communicates with the second chamber. 3. The method of claim 2,
And the first flow path and the second flow path communicate with the second chamber in a state where the water pressure portion is in the first position. The method according to claim 2 or 3,
Wherein the hydraulic pressure portion is maintained at the second position when the hydraulic pressure of the hydraulic fluid in the first chamber and the elastic force of the elastic member satisfy a predetermined condition. 5. The method of claim 4,
The hydraulic pressure portion is displaced from the second position to the first position based on the elastic force of the elastic member when the hydraulic pressure of the hydraulic fluid in the first chamber and the elastic force of the elastic member do not satisfy the predetermined condition Emergency operation valve. 6. The method according to any one of claims 1 to 5,
And the hydraulic pressure portion can be displaced from the first position to the second position by an artificial force. An unloading circuit used in a hydraulic circuit of a hydraulic working machine,
A relief valve interposed between a supply passage connected to the pump and a discharge passage connected to the tank,
And a pilot pressure control valve for controlling the diaphragm of the pilot pressure to the relief valve,
Wherein the pilot pressure control valve includes the emergency operation valve according to any one of claims 1 to 6,
Unload circuit. 8. The method of claim 7,
Wherein the pilot pressure control valve is constituted by an electromagnetic opening / closing valve and a manual opening / closing valve mounted in series in the pilot circuit,
Wherein the manual on-off valve is the emergency operation valve.
KR1020187026482A 2016-04-06 2017-04-06 Emergency operation valve and unloading circuit KR101942229B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2016076332 2016-04-06
JPJP-P-2016-076332 2016-04-06
PCT/JP2017/014320 WO2017175820A1 (en) 2016-04-06 2017-04-06 Emergency operation valve and unloading circuit

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KR20180108837A true KR20180108837A (en) 2018-10-04
KR101942229B1 KR101942229B1 (en) 2019-01-24

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112524325A (en) * 2020-11-30 2021-03-19 沧州润久智能仪表有限公司 Emergency valve

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59186569U (en) * 1983-05-31 1984-12-11 三井精機工業株式会社 Self-holding on-off valve equipped with safety device
JP2008137454A (en) 2006-11-30 2008-06-19 Furukawa Unic Corp Anti-theft device of working machine
JP2009154740A (en) 2007-12-27 2009-07-16 Tadano Ltd Control device for working vehicle
KR20110079877A (en) * 2008-10-31 2011-07-11 히다찌 겐끼 가부시키가이샤 Hydraulic drive device for construction machine

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3495501A (en) * 1968-06-04 1970-02-17 Gen Electric Valve operating and emergency closing mechanism
US5577532A (en) * 1994-07-11 1996-11-26 Palmer; Thomas W. Valve actuator
JPH1113715A (en) * 1997-06-25 1999-01-22 Kubota Corp Hydraulic unit for driving emergency device
CN202023953U (en) * 2011-04-14 2011-11-02 东莞市骏颖机械制造有限公司 High and low pressure switching valve for polyurethane high pressure foaming machine
US9651067B2 (en) * 2012-07-31 2017-05-16 Caterpillar Inc. Hydraulic system with a dynamic seal
CN204805220U (en) * 2015-05-27 2015-11-25 上海朝田实业有限公司 Piston ultralow pressure overflow valve
CN204677838U (en) * 2015-06-09 2015-09-30 武汉东江阀业制造有限公司 Ultrahigh pressure direct-acting type transient equilibrium valve

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59186569U (en) * 1983-05-31 1984-12-11 三井精機工業株式会社 Self-holding on-off valve equipped with safety device
JP2008137454A (en) 2006-11-30 2008-06-19 Furukawa Unic Corp Anti-theft device of working machine
JP2009154740A (en) 2007-12-27 2009-07-16 Tadano Ltd Control device for working vehicle
KR20110079877A (en) * 2008-10-31 2011-07-11 히다찌 겐끼 가부시키가이샤 Hydraulic drive device for construction machine

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WO2017175820A1 (en) 2017-10-12
CN109073111B (en) 2019-12-13
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KR101942229B1 (en) 2019-01-24
JPWO2017175820A1 (en) 2018-04-12

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