JP6753427B2 - Winch device and crane equipped with it - Google Patents

Description

The present invention relates to a winch device for winding a rope and a crane provided with the winch device.

In general, a crane is a self-propelled lower traveling body, an upper rotating body mounted on the lower traveling body so as to be swivel, a boom mounted undulatingly on the upper swivel body, and a rope from the tip of the boom or jib. A winch device having a winch drum for winding a rope is provided with a hook suspended via a rope.

For example, Patent Document 1 discloses a winch braking device including a wet multi-plate brake. The winch (winch drum) in Patent Document 1 is provided on the upper swing body. Patent Document 2 discloses a crane in which a winch drum is supported by a boom.

Japanese Unexamined Patent Publication No. 2016-22238 Japanese Unexamined Patent Publication No. 2016-222358

By the way, the crane may be disassembled into a plurality of components for various purposes and then reassembled, and accordingly, a part of the hydraulic circuit piping is removed from the connection part and then reassembled into the connection part. Be connected. When the piping of the hydraulic circuit is detached from the connection portion in this way, air may be mixed into the hydraulic circuit. When air is mixed into the hydraulic circuit, the responsiveness of the brake may decrease in a winch device provided with a wet brake, for example, the brake device in Patent Document 1. Specific examples are as follows.

For example, for the purpose of transporting a crane, a member such as a boom may be removed from the upper swing body. However, when the winch drum is supported by the boom as in the case of the winch drum in Patent Document 2, for example, the piping of the hydraulic circuit is arranged so as to straddle the upper swing body and the boom, so that the boom is swiveled upward. When removing from the body, it is necessary to remove a part of the piping of the hydraulic circuit from the connection part. Then, after the crane is transported, the removed boom and other members are reattached to the upper swing body, and the removed hydraulic circuit piping is reconnected to the connecting portion. When the piping of the hydraulic circuit is detached from the connection portion in this way, air may be mixed into the hydraulic circuit.

Therefore, it is necessary to remove the air mixed in the hydraulic circuit in order to prevent the responsiveness of the brake from being lowered.

The present invention has been made in view of the above problems, and is a winch device capable of effectively discharging air that may be mixed in a hydraulic circuit in a winch device having a wet brake from the hydraulic circuit. The purpose is to provide a equipped crane.

(1) The winch device of the present invention is mounted on a crane. The winch device includes a winch drum for winding or unwinding a rope, a winch motor for rotating the winch drum, a clutch-on state in which the power of the winch motor is transmitted to the winch drum, and the winch drum. A clutch portion that is disconnected from the winch motor and can be switched between a clutch-off state that allows free rotation of the winch drum, and a positive oil pressure chamber that generates pressure in the direction in which the clutch portion is in the clutch-on state. The oil pressure chamber is connected to a cylinder portion having a negative oil pressure chamber for generating a pressure in the direction in which the clutch portion is in the clutch-off state, and at least one of the positive oil chamber and the negative oil chamber. The hydraulic oil from the hydraulic source is interposed between the hydraulic source for supplying the hydraulic oil and the oil chamber of either the positive oil chamber or the negative oil chamber, and the hydraulic oil from the hydraulic source is the oil chamber. By switching between the supply position that allows the hydraulic oil to be supplied to the oil pressure chamber and the discharge position that allows the hydraulic oil in the oil chamber to be discharged from the oil chamber, the clutch portion is made to perform the switching operation. A mode switching valve, at least one discharge pipe for discharging the hydraulic oil from the oil chamber connected to the hydraulic source among the positive oil chamber and the negative oil chamber, and the positive oil chamber and the negative oil. Among the chambers, a supply pipe connected to the same oil chamber as the oil chamber to which the discharge pipe is connected, and a hydraulic oil connected to the discharge pipe, and the hydraulic oil is discharged from the oil chamber to the discharge pipe. It is configured so that it is possible to switch between an allowable discharge allowable position and a discharge prevention position that prevents the hydraulic oil from being discharged from the oil chamber to the discharge pipe, and the discharge prevention position is used as described. discharged to the discharge pipe wherein the hydraulic oil is hydraulic oil of the oil chamber Rutotomoni the hydraulic oil supplied to the oil chamber is supplied through the supply pipe from the hydraulic source with air by switching the allowable emission position It is provided with an air bleeding switching valve for performing an air bleeding process that enables the hydraulic pressure to be applied.

According to the winch device of the present invention, when a part of the piping of the hydraulic circuit is detached from the connection portion for various purposes (for example, the purpose of transporting a crane) and air is mixed in the hydraulic circuit. Also, the air bleeding process in the oil chamber in the cylinder portion can be effectively performed by utilizing the hydraulic pressure source common to the hydraulic pressure source used for the wet brake. As a result, it is possible to prevent the responsiveness of the wet brake from being lowered. Specifically, it is as follows.

In the present invention, when the air bleeding switching valve is in the discharge blocking position, it is possible to prevent the hydraulic oil in the oil chamber from being discharged to the discharge pipe, so that the hydraulic circuit in the winch device can be used for normal work such as suspension work. Can be used for. On the other hand, by switching the air bleeding switching valve from the discharge blocking position to the discharge allowable position, the hydraulic oil in the oil chamber is allowed to be discharged to the discharge pipe provided in the oil chamber, whereby the hydraulic pressure is increased. It is possible to effectively perform the air bleeding process in which the hydraulic oil from the source is supplied to the oil chamber and discharged to the discharge pipe together with the air in the oil chamber.

(2) The other winch device of the present invention is mounted on a crane, and is a winch drum for winding or unwinding a rope, a winch motor for rotating the winch drum, and the winch motor. A clutch portion capable of switching between a clutch-on state in which power is transmitted to the winch drum and a clutch-off state in which the winch drum is disconnected from the winch motor and allows free rotation of the winch drum, and the clutch. A cylinder portion having a positive oil chamber for generating a pressure in the direction in which the portion is in the clutch-on state and a negative oil chamber for generating a pressure in the direction in which the clutch portion is in the clutch-off state, the positive oil chamber, and the said. A hydraulic source connected to at least one of the negative oil chambers to supply hydraulic oil to the oil chamber, and one of the hydraulic source, the positive oil chamber, and the negative oil chamber. A supply position that allows the hydraulic oil from the hydraulic source to be supplied to the oil chamber and a discharge position that allows the hydraulic oil in the oil chamber to be discharged from the oil chamber. The hydraulic oil is discharged from the mode switching valve for causing the clutch portion to perform the switching operation and the oil chamber connected to the hydraulic source among the positive oil chamber and the negative oil chamber. At least one discharge pipe for the purpose, a discharge allowable position connected to the discharge pipe and allowing the hydraulic oil to be discharged from the oil chamber to the discharge pipe, and the discharge pipe from the oil chamber to the hydraulic oil. It is configured so that it can be switched between the discharge blocking position that prevents the hydraulic oil from being discharged to the hydraulic source, and the hydraulic oil from the hydraulic source is released by switching from the discharge blocking position to the discharge allowable position. The cylinder portion is provided with an air bleeding switching valve for performing an air bleeding process that is supplied to the oil chamber and can be discharged to the discharge pipe together with the air in the oil chamber, and the cylinder portion is provided from the hydraulic source. an inlet port for allowing the said hydraulic fluid is supplied to the oil chamber, and an outlet port provided above the said inlet port and said outlet port that is connected to the discharge pipe.

The air mixed into the oil chamber from the inlet port or the like rises in the hydraulic oil in the oil chamber and tends to collect in the upper part of the oil chamber. In this aspect, in the air bleeding process, the air accumulated in the upper part of the hydraulic chamber can be efficiently discharged to the discharge pipe together with the hydraulic oil through the outlet port provided above the inlet port.

(3) Yet another winch device of the present invention is mounted on a crane, and includes a winch drum for winding or unwinding a rope, a winch motor for rotating the winch drum, and the winch motor. A clutch portion capable of switching between a clutch-on state in which the hydraulic pressure is transmitted to the winch drum and a clutch-off state in which the winch drum is disconnected from the winch motor and allows free rotation of the winch drum, and the clutch portion. A cylinder portion having a positive oil chamber that generates a pressure in the direction in which the clutch portion is in the clutch-on state and a negative oil chamber that generates a pressure in the direction in which the clutch portion is in the clutch-off state, the positive oil chamber, and the positive oil chamber. A hydraulic source connected to at least one of the negative oil chambers to supply hydraulic oil to the oil chamber, and one of the hydraulic source, the positive oil chamber, and the negative oil chamber. A supply position that allows the hydraulic oil from the hydraulic source to be supplied to the oil chamber and a discharge position that allows the hydraulic oil in the oil chamber to be discharged from the oil chamber. The hydraulic oil is discharged from the mode switching valve for causing the clutch portion to perform the switching operation and the oil chamber connected to the hydraulic source among the positive oil chamber and the negative oil chamber by switching between. At least one discharge pipe for the operation, an allowable discharge position connected to the discharge pipe and allowing the hydraulic oil to be discharged from the oil chamber to the discharge pipe, and the hydraulic oil being discharged from the oil chamber. The hydraulic oil from the hydraulic source is configured to be able to switch between a discharge blocking position that prevents discharge into the pipe, and by switching from the discharge blocking position to the discharge allowable position. In the oil chamber to which the air bleeding switching valve for performing the air bleeding process that is supplied to the oil chamber and allows the air to be discharged to the discharge pipe together with the air in the oil chamber and the mode switching valve are connected. a pressure sensor for detecting a pressure, said a necessity determining unit determines the necessity of the air bleeding process, Bei example, said necessity determination unit, said mode switching valve to the supply position from the discharge position based on the time from cut unusual time until the pressure in the oil chamber which is detected by the pressure sensor reaches a predetermined reference pressure, to determine the necessity of the air vent process.

In this embodiment, when the mode switching valve is in the discharge position, the hydraulic oil in the oil chamber is discharged and the pressure in the oil chamber is reduced, but after that, the mode switching valve moves from the discharge position to the supply position. When switched, hydraulic oil is supplied to the oil chamber from the hydraulic source, and the pressure in the oil chamber gradually increases. Here, as the amount of air remaining in the oil chamber increases, the rate of increase in pressure in the oil chamber decreases, and the time (response time) until the pressure reaches a preset reference pressure becomes longer. Therefore, in this embodiment, the necessity of the air bleeding treatment can be appropriately determined based on the residual amount of air in the oil chamber.

(4) The crane of the present invention includes a self-propelled lower traveling body, an upper rotating body mounted on the lower traveling body so as to be able to swivel around an axis, and the winch device described above. The winch drum is configured to be detachable from the upper swing body together with a part of the hydraulic circuit.

According to the crane of the present invention, when the winch drum is attached to and detached from the upper swing body together with a part of the hydraulic circuit for various purposes (for example, the purpose of transporting the crane), and as a result, air is mixed in the hydraulic circuit. Even so, the air bleeding process in the oil chamber in the cylinder portion can be effectively performed by utilizing the hydraulic pressure source common to the hydraulic pressure source used for the wet brake. As a result, it is possible to prevent the responsiveness of the wet brake from being lowered.

(5) The other crane of the present invention includes a self-propelled lower traveling body, an upper rotating body mounted on the lower traveling body so as to be rotatable around an axis, and a winch device, and the winch device. Is a winch drum for winding or unwinding a rope, a winch motor for rotating the winch drum, a clutch-on state in which the power of the winch motor is transmitted to the winch drum, and the winch drum is the winch motor. A clutch portion that is separated from the winch drum and can be switched between a clutch-off state that allows free rotation of the winch drum, a positive oil chamber that generates pressure in the direction in which the clutch portion is in the clutch-on state, and the clutch. A cylinder portion having a negative oil chamber for generating pressure in the direction in which the portion is in the clutch-off state is connected to at least one of the positive oil chamber and the negative oil chamber, and hydraulic oil is supplied to the oil chamber. The hydraulic oil to be supplied is interposed between the hydraulic source and one of the positive oil chamber and the negative oil chamber, and the hydraulic oil from the hydraulic source is supplied to the oil chamber. A mode switching valve for causing the clutch portion to perform the switching operation by switching between a supply position that allows the runch and a discharge position that allows the hydraulic oil in the oil chamber to be discharged from the oil chamber. And at least one discharge pipe for discharging the hydraulic oil from the oil chamber connected to the hydraulic source among the positive oil chamber and the negative oil chamber, and the hydraulic oil connected to the discharge pipe. It is possible to switch between an allowable discharge position that allows discharge from the oil chamber to the discharge pipe and a discharge prevention position that prevents the hydraulic oil from being discharged from the oil chamber to the discharge pipe. By switching from the discharge blocking position to the discharge allowable position, the hydraulic oil from the hydraulic source is supplied to the oil chamber and discharged to the discharge pipe together with the air in the oil chamber. The winch drum of the winch device is configured to be detachably attached to the upper swing body together with a part of the hydraulic circuit, and is provided with an air bleeding switching valve for performing an air bleeding process. The winch device further includes an air bleeding control unit that controls the operation of the air bleeding switching valve. In the winch device, the winch drum is removed from the upper swing body together with a part of the hydraulic circuit, and the winch device is again described. Disassembly and assembly mode until it is attached to the upper swing body There ended, when switched to the working mode with the winch device, that perform the air bleeding process is switched to the discharge permitting position the air vent switching valve from the discharge blocking position.

In this embodiment, when the disassembly / assembly mode is completed, that is, when the air bleeding process is most required because air may be mixed in the oil chamber, and the work mode using the winch device is used. The air bleeding process is executed when the device is switched to, that is, before the work using the winch device is actually started. Therefore, in this embodiment, as compared with the case where the air bleeding process is executed during the work such as the suspension work using the winch device, the air bleeding process is prevented from interfering with the work and the air bleeding process is performed. The air in the oil chamber can be exhausted when it is most needed.

(6) In the crane, the winch device further includes an air bleeding control unit that controls the operation of the air bleeding switching valve, and the air bleeding control unit includes the air when the engine of the crane is started. It is preferable to switch the bleeding switching valve from the discharge blocking position to the discharge allowable position to execute the air bleeding process.

In this aspect, the air bleeding process is performed when the crane engine is started, that is, before the work using the winch device is actually started. Therefore, in this aspect, it is possible to prevent the air bleeding process from interfering with the work as compared with the case where the air bleeding process is executed during the work such as the suspension work using the winch device. Moreover, in this embodiment, since the air bleeding process is executed every time the crane engine is started, the air remaining in the oil chamber can be reduced each time the air bleeding process is performed.

According to the present invention, in a winch device having a wet brake, air that may be mixed in the hydraulic circuit can be effectively discharged from the hydraulic circuit.

It is a side view which shows the crane which concerns on embodiment of this invention. It is a figure which shows the hydraulic circuit in the winch apparatus which concerns on 1st Embodiment of this invention. It is a perspective view which shows the wet brake unit, hydraulic piping, various ports and the like in the winch apparatus which concerns on 1st Embodiment. It is a flowchart which shows an example of the air bleeding method using the winch apparatus which concerns on 1st Embodiment. It is a figure which shows the hydraulic circuit in the winch apparatus which concerns on 2nd Embodiment of this invention. It is a flowchart which shows an example of the air bleeding method using the winch apparatus which concerns on 2nd Embodiment. It is a figure which shows the hydraulic circuit in the winch apparatus which concerns on 3rd Embodiment of this invention. It is a flowchart which shows an example of the air bleeding method using the winch apparatus which concerns on 3rd Embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[crane]
FIG. 1 is a side view showing a crane 100 provided with a winch device 10 according to an embodiment of the present invention. As shown in FIG. 1, the crane 100 can undulate on a self-propelled lower traveling body 101, an upper rotating body 103 mounted on the lower traveling body 101 so as to be able to swivel around an axis, and an upper swivel body 103. It includes an attached boom 104, a hook 105 suspended from the tip of the boom 104 via a rope R, a gantry 107 attached to the upper swing body 103, and a winch device 10 having a winch drum 1. When the jib is attached to the tip of the boom 104, the hook 105 is hung from the tip of the jib via the rope R.

The winch device 10 is for causing the hook 105 to perform an elevating operation for a suspended load operation by winding the rope R connected to the hook 105 on the winch drum 1 or feeding the rope R from the winch drum 1. The rope R is fed out from the winch drum 1, passes through the tip of the boom 104, and hangs from the tip of the boom 104 to hang the hook 105. A suspended load 106 is suspended from the hook 105. The winch drum 1 winds the rope R by rotating in one rotation direction (winding rotation direction) around the rotation axis, thereby raising the hook 105. Further, the winch drum 1 extends the rope R by rotating in the direction opposite to the winding rotation direction, thereby lowering the hook 105.

As shown in FIG. 1, in this embodiment, the winch drum 1 is provided on the boom 104. The winch drum 1 is supported by the boom 104 so that its rotation axis and the vehicle width direction of the crane 100 coincide with each other. Although not shown in FIG. 1, a part of the piping in the hydraulic circuit of the winch device 10 is arranged so as to straddle between the upper swing body 103 and the boom 104.

In the present embodiment, the hydraulic pipe connected to the wet brake unit 2 (see FIG. 2) of the winch device 10 is detachable by a coupler detachable from the connecting portion, so that the crane 100 can be transported. When the boom 104 is removed from the upper swing body 103, the winch drum 1 supported by the boom 104 can be easily separated from the upper swing body 103 together with a part of the hydraulic pipe. In particular, it is preferable that all the hydraulic pipes connected to the winch device 10 are connected by a detachable coupler.

Hereinafter, the winch device 10 according to the embodiment of the present invention will be described in detail.

[First Embodiment]
FIG. 2 is a diagram showing a hydraulic circuit in the winch device 10 according to the first embodiment of the present invention. As shown in FIG. 2, in addition to the winch drum 1 described above, the winch device 10 includes a wet brake unit 2, a winch motor 20, a speed reducer 21, a mode switching valve 22, an air bleeding switching valve 23, and hydraulic pressure. The hydraulic pump 24 as a source, the brake operating device 25, the check valves 26A and 26B, the rotation direction switching valve 27, the hydraulic pump 28, the winch operating device 29, the mode switching switch 30, and the air bleeding switch 35. , And a controller 40.

The winch motor 20 is a drive source for rotationally driving the winch drum 1. In the present embodiment, the winch motor 20 is a hydraulic motor having an output shaft 201 that rotates by receiving the supply of hydraulic oil from the hydraulic pump 28. The winch motor 20 has a first port 20a and a second port 20b, and by receiving the supply of hydraulic oil to one of the ports, the output shaft 201 rotates in the direction corresponding to the one port and the other. Drain hydraulic oil from the port.

The rotation direction switching valve 27 is interposed between the hydraulic pump 28 and the winch motor 20, and hydraulic oil for driving the winch motor 20 is supplied from the hydraulic pump 28 to the first port 20a and the second port 20b of the winch motor 20. It is a control valve for selectively guiding and controlling the direction of the hydraulic oil supplied to the winch motor 20 and controlling the flow rate of the hydraulic oil supplied to the winch motor 20. The rotation direction switching valve 27 has pilot ports 27a and 27b.

The winch operating device 29 has an operating lever 29a as an operating member and a pilot valve 29b. The operation lever 29a rotates in that direction when an operation is given to the operation lever 29a by the operator. The pilot valve 29b has an inlet port (not shown) connected to a pilot pump (not shown) and a pair of outlet ports (not shown). The pair of outlet ports are connected to the pilot ports 27a and 27b of the rotation direction switching valve 27 via a pilot line, respectively. The pilot valve 29b is opened so as to allow the pilot pressure corresponding to the magnitude of the operation to be supplied from the pilot pump to the pilot ports 27a and 27b corresponding to the operation direction of the operation lever 29a. ..

The rotation direction switching valve 27 is held in the neutral position (center position in FIG. 2) when the pilot pressure is not input to the pilot ports 27a and 27b. In this neutral position, the hydraulic pump 28 and the winch motor 20 are cut off and the center bypass line is opened, so that the hydraulic oil from the hydraulic pump 28 returns to the tank T1 as it is through the center bypass line.

Further, when a pilot pressure equal to or higher than a certain level is supplied to the pilot port 27a, the rotation direction switching valve 27 moves from the neutral position to the first drive position (upper position in FIG. 2) with a stroke corresponding to the magnitude of the pilot pressure. shift. At this first drive position, the hydraulic oil from the hydraulic pump 28 is supplied to the first port 20a of the winch motor 20 at a flow rate corresponding to the stroke, and the hydraulic oil discharged from the second port 20b is supplied to the tank T1. Return.

Further, when a pilot pressure equal to or higher than a certain level is supplied to the pilot port 27b, the rotation direction switching valve 27 has a stroke corresponding to the magnitude of the pilot pressure from the neutral position to the second drive position (lower position in FIG. 2). Shift to. At this second drive position, the hydraulic oil from the hydraulic pump 28 is supplied to the second port 20b of the winch motor 20 at a flow rate corresponding to the stroke, and the hydraulic oil discharged from the first port 20a is supplied to the tank T1. Return.

The speed reducer 21 is interposed between the output shaft 201 of the winch motor 20 and the winch drum 1 to transmit the power of the winch motor 20 to the winch drum 1, and is configured by, for example, a planetary gear mechanism. .. A plate (for example, an inner plate 8) of the clutch portion 4 described later is connected to the carrier shaft 211 of the speed reducer 21.

The wet brake unit 2 has a cylinder portion 3 and a clutch portion 4. The clutch portion 4 is between a clutch-on state in which the power of the winch motor 20 is transmitted to the winch drum 1 and a clutch-off state in which the winch drum 1 is disconnected from the winch motor 20 to allow free rotation of the winch drum 1. It is configured so that it can be switched. The clutch portion 4 has a clutch case 7, an inner plate 8 arranged in the clutch case 7, an outer plate 9, a spring 11, and a pressing portion 12.

The cylinder portion 3 has a positive oil chamber 3a that generates a pressure in the direction in which the clutch portion 4 is in the clutch-on state, and a negative oil chamber 3b that generates a pressure in the direction in which the clutch portion 4 is in the clutch-off state. .. The cylinder portion 3 has a cylinder case 5 and a piston 6 arranged in the cylinder case 5 and movable relative to the cylinder case 5 in the axial direction. The piston 6 has a flange portion 6a that partitions the space inside the cylinder case 5 into a positive oil chamber 3a and a negative oil chamber 3b.

When the piston 6 moves in the axial direction, the clutch portion 4 switches between the clutch on state (brake applied state) and the clutch off state (brake released state). Specifically, the clutch portion 4 is in the clutch-on state by applying pressing pressure to the pressing portion 12 so that the inner plate 8 and the outer plate 9 come into contact with each other as the piston 6 moves in one direction in the axial direction. It becomes. On the other hand, when the piston 6 moves to the other side in the axial direction, the inner plate 8 and the outer plate 9 are separated from each other, and the clutch portion 4 is in the clutch-off state. The spring 11 urges the pressing portion 12, that is, the piston 6 in the direction in which the clutch portion 4 is in the clutch-on state.

The mode switching valve 22 is a control valve for switching the clutch unit 4 between the clutch on state (brake state) and the clutch off state (brake release state) in cooperation with the brake operating device 25 described later. The mode switching valve 22 is interposed between the hydraulic pump 24 and the positive oil chamber 3a.

The mode switching valve 22 has a supply position (left position in FIG. 2) that allows the hydraulic oil from the hydraulic pump 24 to be supplied to the positive oil chamber 3a, and the hydraulic oil in the positive oil chamber 3a is the positive oil chamber 3a. It is configured to be switchable to a discharge position (right position in FIG. 2) that allows discharge from the oil. In the present embodiment, the mode switching valve 22 is composed of a solenoid valve.

The mode changeover switch 30 is a switch for switching between a brake mode and a freefall mode, and is configured to be operable by an operator by being provided in the cab of a crane, for example. The mode selector switch 30 is configured to input a freefall mode signal to the controller 40 when the switch is turned on, and is configured to input a brake mode signal to the controller 40 when the switch is turned off. Has been done.

When the mode changeover switch 30 is turned off, the solenoid of the mode changeover valve 22 is in a non-excited state and switches from the discharge position to the supply position (the left side position in FIG. 2). When the mode switching valve 22 switches from the discharge position to the supply position, the mode switching valve 22 allows the hydraulic oil from the hydraulic pump 24 to be supplied to the positive oil chamber 3a. On the other hand, when the mode changeover switch 30 is turned on, the solenoid of the mode changeover valve 22 is excited and switched from the supply position to the discharge position (right position in FIG. 2). When the mode switching valve 22 is switched from the supply position to the discharge position, the mode switching valve 22 prevents the hydraulic oil from the hydraulic pump 24 from being supplied to the positive oil chamber 3a, while the mode switching valve 22 is in the positive oil chamber 3a. Allows hydraulic oil to return to tank T2.

The brake operating device 25 has an operating pedal (foot pedal) 25a as an operating member and a brake valve 25b. The brake valve 25b is operated by the operation pedal 25a.

The positive line 31 (supply pipe) connected to the inlet port 3A of the positive oil chamber 3a is connected to one outlet port of the mode switching valve 22. One inlet port of the mode switching valve 22 is connected to the hydraulic pump 24, and the other inlet port is connected to the outlet port of the brake valve 25b. One inlet port of the brake valve 25b is connected to the tank T2, and the other inlet port of the brake valve 25b is connected to the hydraulic pump 24. The negative line 32 (supply pipe) connected to the inlet port 3B of the negative oil chamber 3b is directly connected to the hydraulic pump 24.

The brake valve 25b is a positive oil in the cylinder portion 3 when the mode changeover switch 30 is on (the mode changeover valve 22 is in the discharge position (right position in FIG. 2)) and the operation pedal 25a is not operated. Allows the hydraulic oil in the chamber 3a to return to the tank T2 via the mode switching valve 22. On the other hand, the brake valve 25b opens according to the stroke of the operation pedal 25a when the operation pedal 25a is operated when the mode changeover switch 30 is on (the mode changeover valve 22 is in the discharge position). The hydraulic oil from the hydraulic pump 24 is allowed to be supplied to the positive oil chamber 3a in the cylinder portion 3 via the mode switching valve 22.

The air bleeding switch 35 is a switch for starting the air bleeding process, and is configured to be operable by an operator. The air bleeding switch 35 is configured to input an air bleeding signal to the controller 40 when the switch is turned on.

The air bleeding switching valve 23 is a control valve for performing an air bleeding process for removing air mixed in the positive oil chamber 3a and the negative oil chamber 3b. The air bleeding switching valve 23 is connected to a positive line 33 (discharge pipe) and a negative line 34 (discharge pipe) for discharging hydraulic oil from the positive oil chamber 3a and the negative oil chamber 3b connected to the hydraulic pump 24. There is.

The air bleeding switching valve 23 is a discharge allowable position (right position in FIG. 2) that allows the hydraulic oil to be discharged from the positive oil chamber 3a and the negative oil chamber 3b to the positive line 33 and the negative line 34 as discharge pipes. And the discharge blocking position (left position in FIG. 2) for preventing the hydraulic oil from being discharged from the positive oil chamber 3a and the negative oil chamber 3b to the positive line 33 and the negative line 34. .. In the present embodiment, the air bleeding switching valve 23 is composed of a solenoid valve.

The positive line 33 is connected to the outlet port 3C of the positive oil chamber 3a, and the negative line 34 is connected to the outlet port 3D of the negative oil chamber 3b. These positive lines 33 and negative lines 34 are connected to the same inlet port in the air bleeding switching valve 23. One outlet port of the air bleeding switching valve 23 is connected to the tank T3.

As shown in FIGS. 2 and 3, the outlet ports 3C and 3D of the cylinder portion 3 are provided (upper) at a position higher than the inlet ports 3A and 3B.

The positive line 33 is provided with a check valve 26A that allows the flow of hydraulic oil from the positive oil chamber 3a to the air bleeding switching valve 23 while blocking the flow of hydraulic oil in the opposite direction. The negative line 34 is provided with a check valve 26B that allows the flow of hydraulic oil from the negative oil chamber 3b to the air bleeding switching valve 23 while blocking the flow of hydraulic oil in the opposite direction. This prevents the hydraulic oil flowing through the positive line 33 from flowing into the negative line 34 and the hydraulic oil flowing through the negative line 34 from flowing into the positive line 33.

When the air bleeding switch 35 is turned off, the solenoid of the air bleeding switching valve 23 is in a non-excited state, switches from the discharge allowable position to the discharge prevention position (left position in FIG. 2), and operates in the positive oil chamber 3a. Prevents the oil and the hydraulic oil in the negative oil chamber 3b from returning to the tank T3. On the other hand, when the air bleeding switch 35 is turned on, the solenoid of the air bleeding switching valve 23 is excited and switched from the discharge blocking position to the discharge allowable position (right position in FIG. 2) in the positive oil chamber 3a. Allows the hydraulic oil and the hydraulic oil in the negative oil chamber 3b to return to the tank T3.

The controller 40 is composed of a central processing unit (Central Processing Unit), a ROM (Read Only Memory) for storing various control programs, a RAM (Random Access Memory) used as a work area of a CPU, and the like.

In the first embodiment, the controller 40 includes an air bleeding control unit 41 and a mode switching control unit 42 as functions. The air bleeding control unit 41 controls the operation of the air bleeding switching valve 23. The mode switching control unit 42 controls the operation of the mode switching valve 22.

The winch device 10 according to the first embodiment as described above performs the following operations.

As shown in FIG. 2, when the mode changeover switch 30 is turned off and the winch device 10 is switched to the brake mode state, the solenoid of the mode changeover valve 22 is in the non-excited state, and the mode changeover valve 22 is supplied from the discharge position. It switches to the position (the left side position in FIG. 2). In this case, the same pressure is applied to the positive oil chamber 3a and the negative oil chamber 3b. Therefore, the pressing force of the spring 11 applies a pressing force to the pressing portion 12 so that the inner plate 8 and the outer plate 9 are in contact with each other, whereby the winch drum 1 and the winch motor 20 are brought into contact with each other via the speed reducer 21. It will be in the engaged state (clutch on state, brake state).

On the other hand, when the mode changeover switch 30 is turned on and the winch device 10 is switched to the freefall mode state, the solenoid of the mode changeover valve 22 is excited, and the mode changeover valve 22 is moved from the supply position to the discharge position (FIG. 2). The position is switched to the right side), and the positive oil chamber 3a is connected to the brake valve 25b of the brake operating device 25.

In this case, when the operation pedal 25a is operated (when the operation pedal 25a is stepped on), the same pressure is applied to the positive oil chamber 3a and the negative oil chamber 3b, so that the winch drum 1 and the winch are passed through the speed reducer 21. The motor 20 is connected to the motor 20 (brake state).

On the other hand, when the operation pedal 25a is not operated (when the operation pedal 25a is not depressed), the pressure in the positive oil chamber 3a is lower than that in the negative oil chamber 3b, so that the pressure in the negative oil chamber 3b is the spring 11 The inner plate 8 and the outer plate 9 are separated from each other (clutch off state, brake release state). As a result, the winch drum 1 is separated from the winch motor 20 and becomes free. When the winch drum 1 is in the free state, the suspended load 106 freely falls due to its own weight, and the speed of this free fall can be increased or decreased according to the operation amount (depression amount) of the operation pedal 25a.

Further, as shown in FIG. 2, in order to prevent seizure of the clutch portion 4 due to friction generated between the inner plate 8 and the outer plate 9, the winch device 10 includes a pump 36 that supplies cooling oil. , A tank 37 for recovering cooling oil is further provided. The cooling oil from the pump 36 is supplied into the clutch case 7 of the clutch portion 4 through, for example, a flow path provided in the piston 6, cools the inner plate 8 and the outer plate 9, and then is collected in the tank 37.

FIG. 4 is a flowchart showing an example of an air bleeding method according to an embodiment of the present invention. As shown in FIG. 4, when the engine of the crane 100 is started (step S1 in FIG. 4), the mode switching control unit 42 of the controller 40 determines that the solenoid of the mode switching valve 22 is in a non-excited state (off state). The mode switching valve 22 is controlled so as to be. As a result, the mode switching valve 22 switches from the discharge position to the supply position (left position in FIG. 2) (step S2 in FIG. 4).

On the other hand, the air bleeding control unit 41 of the controller 40 controls the air bleeding switching valve 23 so that the solenoid of the air bleeding switching valve 23 is in the excited state (on state). As a result, the air bleeding switching valve 23 switches from the discharge blocking position to the discharge allowable position (right position in FIG. 2) (step S3 in FIG. 4). As a result, the hydraulic oil supplied from the hydraulic pump 24 to the positive oil chamber 3a through the positive line 31 flows out to the positive line 33 from the outlet port 3C of the positive oil chamber 3a together with the air mixed in the hydraulic oil, and bleeds air. It returns to the tank T3 via the switching valve 23. Similarly, the hydraulic oil supplied from the hydraulic pump 24 to the negative oil chamber 3b through the negative line 32 flows out to the negative line 34 from the outlet port 3D of the negative oil chamber 3b together with the air mixed in the hydraulic oil, and bleeds air. It returns to the tank T3 via the switching valve 23.

On the other hand, the air bleeding control unit 41 determines whether or not the preset air bleeding time has elapsed (step S4 in FIG. 4). When the air bleeding control unit 41 determines that the air bleeding time has not elapsed (NO in step S4 of FIG. 4), the solenoid of the air bleeding switching valve 23 is maintained in the excited state (on state). The air bleeding switching valve 23 is controlled. On the other hand, when the air bleeding control unit 41 determines that the air bleeding time has elapsed (YES in step S4 of FIG. 4), the solenoid of the air bleeding switching valve 23 is in a non-excited state (off state). The solenoid switching valve 23 is controlled (step S5 in FIG. 4). As a result, the air bleeding switching valve 23 switches from the discharge allowable position to the discharge prevention position (the position on the left side in FIG. 2), and the air bleeding process is completed.

[Second Embodiment]
FIG. 5 is a diagram showing a hydraulic circuit in the winch device 10 according to the second embodiment of the present invention. The winch device 10 according to the second embodiment shown in FIG. 5 has a pressure sensor 38 on a positive line 31 connecting the mode switching valve 22 and the positive oil chamber 3a, and a determination as to whether or not the air bleeding process is necessary. It is different from the winch device 10 according to the first embodiment shown in FIG. 2 in that it further includes a part 43, and other configurations are the same as those of the first embodiment.

The pressure sensor 38 is provided to determine the responsiveness of the brake by detecting the pressure of the positive line 31, that is, the pressure of the positive oil chamber 3a. The detection signal from the pressure sensor 38 is input to the controller 40.

The necessity determination unit 43 sets the time from the time when the mode switching valve 22 switches from the discharge position to the supply position until the pressure in the oil chamber detected by the pressure sensor 38 reaches a preset reference pressure. Based on this, the necessity of the air bleeding process is determined.

FIG. 6 is a flowchart showing an example of an air bleeding method using the winch device 10 according to the second embodiment. In the air bleeding method shown in FIG. 6, steps S11 to S15 are the same processes as steps S1 to S5 in the air bleeding method shown in FIG.

In the air bleeding method shown in FIG. 6, when the processes of steps S11 to S15, that is, the first air bleeding process is completed, the mode switching control unit 42 of the controller 40 is in an excited state (ON) of the solenoid of the mode switching valve 22. The mode switching valve 22 is controlled so as to be in the state of). As a result, the mode switching valve 22 switches from the supply position to the discharge position (right position in FIG. 5) (step S16 in FIG. 6). As a result, the hydraulic oil in the positive oil chamber 3a is allowed to return to the tank T2 through the positive line 31, and the pressure of the hydraulic oil in the positive line 31, that is, the pressure in the positive oil chamber 3a is reduced.

On the other hand, the mode switching control unit 42 controls the mode switching valve 22 so that the solenoid of the mode switching valve 22 is in a non-excited state (off state). As a result, the mode switching valve 22 switches from the discharge position to the supply position (left position in FIG. 5) (step S17 in FIG. 6). As a result, the hydraulic oil from the hydraulic pump 24 is supplied to the positive oil chamber 3a of the cylinder portion 3 through the positive line 31, and the pressure of the positive line 31, that is, the pressure of the positive oil chamber 3a gradually increases.

At this time, the rate of increase in pressure changes according to the amount of air remaining in the positive oil chamber 3a. Specifically, the larger the remaining amount of air, the slower the pressure rise rate. Therefore, the necessity determination unit 43 determines the time (response) from when the solenoid of the mode switching valve 22 is in the non-excited state (off state) in step S17 until the pressure of the positive line 31 reaches a predetermined reference pressure. Time) is measured. The pressure is detected by the pressure sensor 38, and the detection signal is input to the controller 40. Then, the necessity determination unit 43 determines whether or not the response time is less than a predetermined reference time (step S18 in FIG. 6).

When the response time is equal to or longer than the reference time (NO in step S18 of FIG. 6), the amount of air removed by the first air bleeding process is not sufficient, so the air bleeding process needs to be performed again. Therefore, when the necessity determination unit 43 determines that the response time is equal to or longer than the reference time, the air bleeding control unit 41 bleeds air so that the air bleeding switching valve 23 is in the excited state (on state). The switching valve 23 is controlled (step S13 in FIG. 6). As a result, the hydraulic oil supplied from the hydraulic pump 24 to the positive oil chamber 3a of the cylinder portion 3 through the positive line 31 flows out to the positive line 33 from the outlet port 3C of the positive oil chamber 3a together with the air mixed in the hydraulic oil. Then, it returns to the tank T3 via the air bleeding switching valve 23. Similarly, the hydraulic oil supplied from the hydraulic pump 24 to the negative oil chamber 3b of the cylinder portion 3 through the negative line 32 flows out to the negative line 34 from the outlet port 3D of the negative oil chamber 3b together with the air mixed in the hydraulic oil. Then, it returns to the tank T3 via the air bleeding switching valve 23. The determination result by the necessity determination unit 43 may be displayed on the display unit of the illustration so that the operator can recognize it.

On the other hand, the air bleeding control unit 41 determines whether or not the preset air bleeding time has elapsed (step S14 in FIG. 6). When the air bleeding control unit 41 determines that the air bleeding time has not elapsed (NO in step S14 of FIG. 6), the solenoid of the air bleeding switching valve 23 is maintained in the excited state (on state). The air bleeding switching valve 23 is controlled. On the other hand, when the air bleeding control unit 41 determines that the air bleeding time has elapsed (YES in step S14 of FIG. 6), the air bleeding switching valve 23 is in the non-excited state (off state). The punch switching valve 23 is controlled (step S15 in FIG. 6). As a result, the second air bleeding process is completed.

When the second air bleeding process is completed, the controller 40 executes the processes of steps S16 to S18 described above. Then, when the response time is equal to or longer than the reference time (NO in step S18 of FIG. 6), even if the second air bleeding process is executed, the amount of air removed is still insufficient, so the air bleeding process is performed again. There is a need. Therefore, the controller 40 executes the processes of steps S13 to S17 described above. On the other hand, when the response time is less than the reference time (YES in step S18 of FIG. 6), the amount of air removed is sufficient and sufficient brake responsiveness is obtained, so that the controller 40 performs the above-described processing. Do not execute. As a result, the air bleeding process is completed.

[Third Embodiment]
FIG. 7 is a diagram showing a hydraulic circuit in the winch device 10 according to the third embodiment of the present invention. The hydraulic circuit of the winch device 10 according to the third embodiment shown in FIG. 7 is different from the hydraulic circuit of the winch device 10 according to the first embodiment shown in FIG. 2 in the following points, and other configurations are the first. Since it is the same as the hydraulic circuit in the embodiment, only the differences from the hydraulic circuit in the first embodiment will be described below.

In the hydraulic circuit according to the third embodiment, the positive line 31 is connected to the inlet port 3A of the positive oil chamber 3a of the cylinder portion 3. The positive line 31 is not connected to the mode switching valve 22 and the hydraulic pump 24 as in the first embodiment, but is connected to the tank T4. Further, the positive line 33 in the first embodiment is not connected to the outlet port 3C of the positive oil chamber 3a of the cylinder portion 3. Therefore, the check valve 26B is not provided on the negative line 34 because it is unnecessary in the first embodiment.

A negative line 32 is connected to the inlet port 3B of the negative oil chamber 3b of the cylinder portion 3. The negative line 32 is not directly connected to the hydraulic pump 24 as in the first embodiment, but is connected to one outlet port of the mode switching valve 22. Then, one inlet port of the mode switching valve 22 is connected to the tank T2. The other inlet port of the mode switching valve 22 is connected to the outlet port of the brake valve 25b. One inlet port of the brake valve 25b is connected to the hydraulic pump 24. The other inlet port of the brake valve 25b is connected to the tank T2.

The winch device 10 according to the third embodiment as described above performs the following operations.

As shown in FIG. 7, when the mode changeover switch 30 is turned off and the winch device 10 is switched to the brake mode state, the solenoid of the mode changeover valve 22 is in the non-excited state, and the mode changeover valve 22 is discharged from the supply position. It switches to the position (the left side position in FIG. 7). In this case, the same pressure is applied to the positive oil chamber 3a and the negative oil chamber 3b. Therefore, the pressing force of the spring 11 applies a pressing force to the pressing portion 12 so that the inner plate 8 and the outer plate 9 are in contact with each other, whereby the winch drum 1 and the winch motor 20 are brought into contact with each other via the speed reducer 21. It will be in the engaged state (clutch on state, brake state).

On the other hand, when the mode changeover switch 30 is turned on and the winch device 10 is switched to the freefall mode state, the solenoid of the mode changeover valve 22 is excited, and the mode changeover valve 22 is moved from the discharge position to the supply position (FIG. 7). The position is switched to the right side), and the negative oil chamber 3b is connected to the brake valve 25b of the brake operating device 25.

In this case, when the operation pedal 25a is operated (when the operation pedal 25a is stepped on), the negative oil chamber 3b is connected to the tank T2, and the same pressure is applied to the positive oil chamber 3a and the negative oil chamber 3b, so that the speed is reduced. The winch drum 1 and the winch motor 20 are connected to each other via the machine 21 (brake state).

On the other hand, when the operation pedal 25a is not operated (when the operation pedal 25a is not depressed), the pressure in the negative oil chamber 3b becomes higher than the pressure in the positive oil chamber 3a, so that the pressure in the negative oil chamber 3b increases. It becomes larger than the urging force by the spring 11, and the inner plate 8 and the outer plate 9 are separated from each other (clutch off state, brake release state). As a result, the winch drum 1 is separated from the winch motor 20 and becomes free. When the winch drum 1 is in the free state, the suspended load 106 freely falls due to its own weight, and the speed of this free fall can be increased or decreased according to the operation amount (depression amount) of the operation pedal 25a.

FIG. 8 is a flowchart showing an example of an air bleeding method using the winch device 10 according to the third embodiment. As shown in FIG. 8, when the engine of the crane 100 is started (step S21 in FIG. 8), the air bleeding control unit 41 of the controller 40 is in an excited state (on state) of the solenoid of the air bleeding switching valve 23. The air bleeding switching valve 23 is controlled so as to be. As a result, the air bleeding switching valve 23 switches from the discharge blocking position to the discharge allowable position (right position in FIG. 7) (step S22 in FIG. 8).

On the other hand, the mode switching control unit 42 of the controller 40 controls the mode switching valve 22 so that the solenoid of the mode switching valve 22 is in the excited state (ON state). As a result, the mode switching valve 22 switches from the discharge position to the supply position (right position in FIG. 7) (step S23 in FIG. 8). As a result, the hydraulic oil supplied from the hydraulic pump 24 to the negative oil chamber 3b of the cylinder portion 3 through the negative line 32 flows out to the negative line 34 from the outlet port 3D of the negative oil chamber 3b together with the air mixed in the hydraulic oil. Then, it returns to the tank T3 via the air bleeding switching valve 23.

Since the positive oil chamber 3a is only connected to the tank T4, it is not necessary to attach or detach the pipe connecting the positive oil chamber 3a and the tank T4 even during transportation of the crane 100. Therefore, in the third embodiment, since air is not mixed in the positive oil chamber 3a, the air bleeding process is unnecessary.

However, when the pipe (positive line 31) connecting the positive oil chamber 3a and the tank T4 is attached or detached during transportation of the crane 100, for example, a pipe connecting the hydraulic pump 24 and the positive line 31 is provided. Then, the air bleeding process of the positive oil chamber 3a may be performed.

On the other hand, the air bleeding control unit 41 determines whether or not the preset air bleeding time has elapsed (step S24 in FIG. 8). When the air bleeding control unit 41 determines that the air bleeding time has not elapsed (NO in step S24 of FIG. 8), the air bleeding switching valve 23 keeps the solenoid of the air bleeding switching valve 23 in the ON state. 23 is controlled.

On the other hand, when the air bleeding control unit 41 determines that the air bleeding time has elapsed (YES in step S24 of FIG. 8), the mode switching control unit 42 is in a non-excited state (off state) of the solenoid of the mode switching valve 22. ), The mode switching valve 22 is controlled. As a result, the mode switching valve 22 switches from the supply position to the discharge position (left position in FIG. 7) (step S25 in FIG. 8). Then, the air bleeding control unit 41 controls the air bleeding switching valve 23 so that the solenoid of the air bleeding switching valve 23 is in a non-excited state (off state). As a result, the air bleeding switching valve 23 switches from the discharge allowable position to the discharge prevention position (the position on the left side in FIG. 7) (step S26 in FIG. 8), and the air bleeding process is completed.

[Modification]
The present invention is not limited to the embodiments described above. The present invention includes, for example, the following forms.

In the above embodiment, the case where the winch drum 1 is supported by the boom 104 has been illustrated, but the present invention is not limited to this. Even if the winch drum 1 is provided on the upper swing body 103, if the winch drum 1 is arranged in the vicinity of a member such as a gantry 107 (see FIG. 1) or a mast shown in the drawing, the winch drum 1 or When removing the mast from the upper swing body 103, it may be necessary to remove the winch drum 1 from the upper swing body for reasons such as location restrictions. Even in such a case, the winch device 10 and the crane 100 according to the above embodiment can be used.

In the above embodiment, the air bleeding control unit 41 ends the disassembly and assembly mode until the winch drum 1 is removed from the upper swing body 103 together with a part of the hydraulic circuit and is attached to the upper swing body 103 again, and the winch device 10 The air bleeding process may be executed each time the work mode is switched to.

Further, in the above embodiment, the air bleeding control unit 41 may be configured to execute the air bleeding process every time the engine of the crane 100 is started.

R rope 1 winch drum 2 wet brake unit 3 cylinder part 3a positive oil chamber 3b negative oil chamber 4 clutch part 10 winch device 20 winch motor 21 speed reducer 22 mode switching valve 23 air bleeding switching valve 24 hydraulic pump 25 brake operating device 40 controller 41 Air bleeding control unit 42 Mode switching control unit 43 Necessity judgment unit 100 Crane 101 Lower traveling body 103 Upper swivel body 104 Boom

Claims (6)

A winch device mounted on a crane
A winch drum for winding or unwinding the rope,
A winch motor for rotating the winch drum and
A clutch unit capable of switching between a clutch-on state in which the power of the winch motor is transmitted to the winch drum and a clutch-off state in which the winch drum is separated from the winch motor and allows free rotation of the winch drum. When,
A cylinder portion having a positive oil chamber for generating pressure in the direction in which the clutch portion is in the clutch-on state and a negative oil chamber for generating pressure in the direction in which the clutch portion is in the clutch-off state.
A hydraulic source connected to at least one of the positive oil chamber and the negative oil chamber to supply hydraulic oil to the oil chamber.
A supply position that is interposed between the hydraulic source and any one of the positive oil chamber and the negative oil chamber and allows the hydraulic oil from the hydraulic source to be supplied to the oil chamber. A mode switching valve for causing the clutch portion to perform the switching operation by switching the discharge position that allows the hydraulic oil in the oil chamber to be discharged from the oil chamber.
Of the positive oil chamber and the negative oil chamber, at least one discharge pipe for discharging the hydraulic oil from the oil chamber connected to the hydraulic source, and
Of the positive oil chamber and the negative oil chamber, a supply pipe connected to the same oil chamber as the oil chamber to which the discharge pipe is connected, and
A discharge permissible position connected to the discharge pipe and allowing the hydraulic oil to be discharged from the oil chamber to the discharge pipe and a discharge to prevent the hydraulic oil from being discharged from the oil chamber to the discharge pipe. It is configured so that it can be switched between the blocking position and the hydraulic oil from the hydraulic source is supplied to the oil chamber through the supply pipe by switching from the discharge blocking position to the discharge allowable position. winch apparatus and a air vent switching valve for performing air bleeding process is Rutotomoni the hydraulic oil is hydraulic oil supplied the oil chamber to allow it to be discharged into the discharge pipe together with air. A winch device mounted on a crane
A winch drum for winding or unwinding the rope,
A winch motor for rotating the winch drum and
A clutch unit capable of switching between a clutch-on state in which the power of the winch motor is transmitted to the winch drum and a clutch-off state in which the winch drum is separated from the winch motor and allows free rotation of the winch drum. When,
A cylinder portion having a positive oil chamber for generating pressure in the direction in which the clutch portion is in the clutch-on state and a negative oil chamber for generating pressure in the direction in which the clutch portion is in the clutch-off state.
A hydraulic source connected to at least one of the positive oil chamber and the negative oil chamber to supply hydraulic oil to the oil chamber.
A supply position that is interposed between the hydraulic source and any one of the positive oil chamber and the negative oil chamber and allows the hydraulic oil from the hydraulic source to be supplied to the oil chamber. A mode switching valve for causing the clutch portion to perform the switching operation by switching the discharge position that allows the hydraulic oil in the oil chamber to be discharged from the oil chamber.
Of the positive oil chamber and the negative oil chamber, at least one discharge pipe for discharging the hydraulic oil from the oil chamber connected to the hydraulic source, and
A discharge permissible position connected to the discharge pipe and allowing the hydraulic oil to be discharged from the oil chamber to the discharge pipe and a discharge to prevent the hydraulic oil from being discharged from the oil chamber to the discharge pipe. The hydraulic oil from the hydraulic source is supplied to the oil chamber by switching from the discharge blocking position to the discharge allowable position so as to be able to switch between the blocking position and the oil. It is equipped with an air bleeding switching valve for performing an air bleeding process that enables the air to be discharged to the discharge pipe together with the indoor air.
The cylinder portion has an inlet port that allows the hydraulic oil to be supplied from the hydraulic source to the oil chamber, and an outlet port provided above the inlet port, and the outlet port has an outlet port. the discharge pipe is connected, c inch equipment. A winch device mounted on a crane
A winch drum for winding or unwinding the rope,
A winch motor for rotating the winch drum and
A clutch unit capable of switching between a clutch-on state in which the power of the winch motor is transmitted to the winch drum and a clutch-off state in which the winch drum is separated from the winch motor and allows free rotation of the winch drum. When,
A cylinder portion having a positive oil chamber for generating pressure in the direction in which the clutch portion is in the clutch-on state and a negative oil chamber for generating pressure in the direction in which the clutch portion is in the clutch-off state.
A hydraulic source connected to at least one of the positive oil chamber and the negative oil chamber to supply hydraulic oil to the oil chamber.
A supply position that is interposed between the hydraulic source and any one of the positive oil chamber and the negative oil chamber and allows the hydraulic oil from the hydraulic source to be supplied to the oil chamber. A mode switching valve for causing the clutch portion to perform the switching operation by switching the discharge position that allows the hydraulic oil in the oil chamber to be discharged from the oil chamber.
Of the positive oil chamber and the negative oil chamber, at least one discharge pipe for discharging the hydraulic oil from the oil chamber connected to the hydraulic source, and
A discharge permissible position connected to the discharge pipe and allowing the hydraulic oil to be discharged from the oil chamber to the discharge pipe and a discharge to prevent the hydraulic oil from being discharged from the oil chamber to the discharge pipe. The hydraulic oil from the hydraulic source is supplied to the oil chamber by switching from the discharge blocking position to the discharge allowable position so as to be able to switch between the blocking position and the oil. An air bleeding switching valve for performing an air bleeding process that enables the air to be discharged to the discharge pipe together with the indoor air.
A pressure sensor for detecting the pressure in the oil chamber to which the mode switching valve is connected, and
E Bei and a necessity determining unit determines the necessity of the air vent process,
The necessity determination unit sets the time from the time when the mode switching valve is switched from the discharge position to the supply position until the pressure in the oil chamber detected by the pressure sensor reaches a preset reference pressure. based on, it determines the necessity of the air vent process, c inch equipment. A self-propelled lower running body and
An upper revolving structure which is swingably mounted about an axis on the lower traveling body,
The winch device according to any one of claims 1 to 3 is provided.
A crane in which the winch drum of the winch device is detachably configured with respect to the upper swing body together with a part of a hydraulic circuit. A self-propelled lower running body and
An upper swivel body mounted on the lower traveling body so as to be swivel around an axis,
Equipped with a winch device,
The winch device
A winch drum for winding or unwinding the rope,
A winch motor for rotating the winch drum and
A clutch unit capable of switching between a clutch-on state in which the power of the winch motor is transmitted to the winch drum and a clutch-off state in which the winch drum is separated from the winch motor and allows free rotation of the winch drum. When,
A cylinder portion having a positive oil chamber for generating pressure in the direction in which the clutch portion is in the clutch-on state and a negative oil chamber for generating pressure in the direction in which the clutch portion is in the clutch-off state.
A hydraulic source connected to at least one of the positive oil chamber and the negative oil chamber to supply hydraulic oil to the oil chamber.
A supply position that is interposed between the hydraulic source and any one of the positive oil chamber and the negative oil chamber and allows the hydraulic oil from the hydraulic source to be supplied to the oil chamber. A mode switching valve for causing the clutch portion to perform the switching operation by switching the discharge position that allows the hydraulic oil in the oil chamber to be discharged from the oil chamber.
Of the positive oil chamber and the negative oil chamber, at least one discharge pipe for discharging the hydraulic oil from the oil chamber connected to the hydraulic source, and
A discharge permissible position connected to the discharge pipe and allowing the hydraulic oil to be discharged from the oil chamber to the discharge pipe and a discharge to prevent the hydraulic oil from being discharged from the oil chamber to the discharge pipe. The hydraulic oil from the hydraulic source is supplied to the oil chamber by switching from the discharge blocking position to the discharge allowable position so as to be able to switch between the blocking position and the oil. It is equipped with an air bleeding switching valve for performing an air bleeding process that enables the air to be discharged to the discharge pipe together with the indoor air.
The winch drum of the winch device, together with a part of the hydraulic circuit, is configured to be detachable from the upper swing body.
The winch device further includes an air bleeding control unit that controls the operation of the air bleeding switching valve.
In the air bleeding control unit, the disassembly / assembly mode until the winch drum is removed from the upper swing body together with a part of the hydraulic circuit and is attached to the upper swing body again is completed, and the work using the winch device is completed. when switched to the mode for executing the air vent process by switching the air vent switching valve in the discharge permitting position from the discharge blocking position, cranes. The winch device further includes an air bleeding control unit that controls the operation of the air bleeding switching valve.
The fourth aspect of claim 4, wherein the air bleeding control unit switches the air bleeding switching valve from the discharge blocking position to the discharge allowable position and executes the air bleeding process when the engine of the crane is started. crane.

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