JPH10306802A - Passage switching apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely lock operation of a cylinder which is not supplied with working fluid, by securely sealing each of fluid chambers of the cylinder. SOLUTION: A passage switching apparatus 19 switches passages to allow working fluid from a pump 16 to selectively flow into an elevating cylinder 17 or a rotating cylinder 18. The elevating cylinder 17 has a piston side fluid chamber 35A and a rod side fluid chamber 35B, and the rotating cylinder 18 has a piston side fluid chamber 56A and a rod side fluid chamber 56B. The passage selecting apparatus 19 is comprised of a switching valve 88, an elevating cylinder side shuttle valve 89 which is disposed between the switching valve 88 and the elevating cylinder 17, and a rotating cylinder side shuttle valve 90 which is disposed between the switching valve 88 and the rotating cylinder 18. The switching valve 88 is constituted so that, for each of the cylinders 17, 18, ports 100, 101 of the pump 16 are selectively communicated with the fluid chambers 35A, 35B of the elevating cylinder 17 or the fluid chambers 56A, 56B of the rotating cylinder 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow path switching device for switching a flow path of a working fluid.

[0002]

2. Description of the Related Art For example, as shown in a crane device described in Japanese Utility Model Laid-Open No. 5-42295, a pump is used to move a crane boom up and down from a pump to a first hydraulic cylinder device and a second hydraulic cylinder device to operate an outrigger. Switching the flow path from a fluid supply to a plurality of cylinder devices with different functions, such as switching the path, is typically implemented using a spool valve. That is, when the spool valve is supplying the working fluid to one of the cylinder devices,
The flow path to the other cylinder device is located at the neutral position of the spool valve, and the flow path to the other cylinder device is shut off.

[0003]

However, the cutoff of the flow path at the neutral position by the spool valve is not complete, and if an excessive load acts on the other cylinder device communicating with the flow path located at the neutral position. The working fluid from the other cylinder device flows into the other port of the spool valve through the gap between the spool of the spool valve and the spool cylinder even if the flow path is at the neutral position of the spool valve. Of the cylinder device expands and contracts.

The object of the present invention has been made in view of the above-mentioned circumstances, and reliably seals the respective fluid chambers of the cylinder device to which the working fluid is not supplied, thereby ensuring the operation of the cylinder device. It is to provide a fluid switching device that can be locked.

[0005]

According to the present invention, the working fluid from the fluid supply source can be selectively supplied to a plurality of cylinder devices having two fluid chambers by switching the flow path. A switching valve for selectively connecting the discharge port and the discharge port of the fluid supply source to the two fluid chambers of the plurality of cylinder devices for each of the cylinder devices; Between the two fluid chambers of the cylinder device and the switching valve, so that the flow of hydraulic oil from the switching device to the switching valve can be prevented. And a plurality of shuttle valves that allow the flow of the working fluid toward one of the above and the flow of the working oil from the other of the fluid chambers of the cylinder device to the switching valve.

According to a second aspect of the present invention, in the first aspect of the present invention, both fluid chambers of each of the cylinder devices can be communicated with a flow path that communicates each of the shuttle valves with each of the cylinder devices. A manual valve is provided.

[0007] The invention described in claim 3 is the first or second invention.
In the invention described in the above, the switching valve can be opened and closed by each of the cam shafts having a plurality of cams formed by eccentric circles, and can be communicated with each of the fluid chambers of the plurality of cylinder devices. And a plurality of poppet valves, the same number of the cams as the number of the fluid chambers of the plurality of cylinder devices.

The first aspect of the present invention has the following operation. Since a plurality of shuttle valves are respectively installed between the switching valve and the plurality of cylinder devices, and each shuttle valve can block the flow of the hydraulic oil flowing from both the fluid chambers of each cylinder device to the switching valve, The communication between the two fluid chambers of the device and the communication between the fluid chambers in the plurality of cylinder devices can be reliably shut off. Therefore, even if an external force acts on the cylinder device which is switched by the flow path switching device and is stopped, the operation of the cylinder device can be reliably locked, and the inadvertent expansion and contraction operation of the cylinder device can be reliably prevented. .

The invention according to claim 2 has the following operation. Since the manual valve that allows communication between the two fluid chambers of the cylinder device is installed in the flow path that communicates the shuttle valve and the cylinder device, even if the shuttle valve is arranged,
If the manual valve is opened, the two fluid chambers of the cylinder device can be communicated, and the cylinder device can be manually operated to expand and contract.

The third aspect of the invention has the following operation. Since the camshaft constituting the switching valve has a cam formed by an eccentric circle, the camshaft can be more easily processed and cost can be reduced as compared with a case where the cam is formed by an ellipse, for example.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a ship equipped with a crane device to which one embodiment of a flow path switching device according to the present invention is applied. FIG. 2 is a plan view of the ship shown in FIG. FIG. 3 is a front view showing the crane device of FIG. FIG. 4 is a front view showing a part of the crane device of FIG. FIG. 5 shows V-
It is sectional drawing which follows the V line. FIG. 6 is a view on arrow VI in FIG. FIG. 7 is a sectional view taken along line VII-VII in FIG. FIG. 8 is a circuit diagram showing a hydraulic circuit of the crane device of FIG. FIG. 9 is a front sectional view showing the flow path switching device of FIG. 4 according to the present invention. FIG. 10 is a sectional view taken along the line XX in FIG. FIG. 11 is a sectional view taken along line XI-XI in FIG. FIG. 12 is a sectional view taken along line XII-XII in FIG.
FIG. 13 is a rear view showing the flow path switching device of FIG. FIG. 14 is a view on arrow XIV in FIG. FIG. 15 shows XV in FIG.
It is an arrow view. FIG. 16 is a view on arrow XVI of FIG. 11 in a state where a grip or the like is mounted.

[A] Overall Configuration of Crane Apparatus As shown in FIGS.
1, lifts and turns a load 12, places the load 12 on a deck 13 of a ship 11 and transports it,
The cargo 12 on the deck 13 is transported outboard. The crane device 10 includes a column 14, a crane boom 1
5. Pump device 16 as fluid supply source, lifting cylinder device 17, swivel cylinder device 18, and flow path switching device 19
Is configured.

[B] Support The support 14 is, as shown in FIGS. 3 and 4, a column 20 rotatably disposed around a turning shaft 14A through a bearing 22 in a column base 21 via a bearing 22. . The column base 21 is fixed to the mounting bracket 23 and is erected. The mounting bracket 23 is, for example, bolted near the deck 13 of the boat 11 shown in FIGS. 1 and 2, and the crane device 10 is installed on the boat 11.

[C] Crane Boom The crane boom 15 has a pivot shaft 24 at the upper end of the column 20 on the support column 14 as shown in FIG.
It is pivotally supported in a vertical plane. A pulley 25 is rotatably supported at the tip of the crane boom 15. A reinforcement member 26 having a U-shaped cross section is fixed to the lower surface of the crane boom 15.

A plurality of pin holes 27 are opened in the reinforcing member 26 along the longitudinal direction of the crane boom 15, and a pin 28 is fitted into one of the pin holes 27. The pin 28 is fixed to the other end of the wire 30 wound around the pulley 25.
A hook 29 that can lock the load 12 is fixed to the leading end of the “0”. By selectively fitting the pin 28 into the pin hole 27, the length of the wire 30 hanging from the pulley 25 is adjusted.

[D] Elevating Cylinder Device One elevating cylinder device 17 is disposed between the column 20 of the column 14 and the crane boom 15, and expands and contracts by supply and discharge of hydraulic oil from the pump 16, and the crane Boom 1
5 is pivotable about the pivot shaft 24 so that it can be moved up and down. As shown in FIG. 8, each lifting cylinder device 17 has a piston 33 slidably disposed on a cylinder 32, and a piston rod 34 connected to the piston 33.
Are projected from the cylinder 32. Piston 3
3, the inside of the cylinder 32 is partitioned into a rod-side chamber 35B that accommodates the piston rod 34 and a piston-side chamber 35A that does not accommodate the piston rod 34.

As shown in FIGS. 3, 4 and 7, a shaft support 36 is formed on the cylinder 32 of the lifting cylinder device 32. The support bracket 3 is provided on the column 20 of the support 14.
1 is installed. The cylinder 32 is supported by the support bracket 31 so as to be swingable about the mounting bolt 37 via a mounting bolt 37 inserted into the shaft support portion 36 and nuts 38 screwed to both ends of the mounting bolt 37. You. A shaft support 39 is provided at the tip of a piston rod 34 of the elevating cylinder device 17, and the piston rod 34 is supported by the reinforcing member 26 of the crane boom 15 via a mounting bolt 40 inserted into the shaft support 39. Is done.

As shown in FIG. 7, the mounting bolt 37 is formed with a flow path 42 communicating with the pipe 41 and communicating with a flow path 43 formed on the shaft support 36 of the cylinder 32. The flow path 43 communicates with the piston side chamber 35A. These pipes 41, flow paths 42 and 43 constitute a fifth piston-side chamber flow path 85 (FIG. 8), which will be described later, and can supply and discharge hydraulic oil to and from the piston-side chamber 35A.

Further, a pipe 44 is attached to the mounting bolt 37.
And a flow path 4 formed on the side of the cylinder 32
6 (FIG. 3) is formed, and the flow path 46 communicates with the rod-side chamber 35B. These piping 44 and flow path 4
Reference numerals 5 and 46 denote a fifth rod-side chamber flow path 95 described later (FIG. 8).
And the hydraulic oil can be supplied to and discharged from the rod side chamber 35B.

The above-described lifting cylinder device 17 is extended (that is, the piston rod 34 is connected to the cylinder 3) by supplying hydraulic oil from the pump device 16 to the piston 35A.
2), and contracts (ie, the piston rod 34 enters the cylinder 32) by supplying the hydraulic oil to the rod side chamber 35B.

[E] Swivel Cylinder Device The swivel cylinder device 18 is mounted on a mounting base 52 fixed to the column base 21 of the support 14 as shown in FIGS. 14A, the crane boom 15
Can be turned around the turning axis 14A. The mounting base 52 is mounted on the column base 2 in a direction orthogonal to the turning shaft 14A.
1 is fixed.

As shown in FIG. 8, the revolving cylinder device 18 has a piston 53 slidably disposed on a cylinder 53 and a piston rod 55 connected to the piston 54.
Are projected from the cylinder 53. Piston 54
Accordingly, the inside of the cylinder 53 is divided into a rod-side chamber 56B that accommodates the piston rod 55 and a piston-side chamber 56A that does not accommodate the piston rod 55.

As shown in FIGS. 4 and 5, a shaft support 57 is formed on the cylinder 53 of the revolving cylinder device 18, and the mounting bolt 58 inserted through the shaft support 57 causes the cylinder 53 to rotate around the mounting bolt 58. It is swingably supported by the mounting base 52.

A pivot support 59 is provided at the tip of the piston rod 55 of the revolving cylinder device 18.
The mounting bracket 61 is supported via the mounting pin 60. This mounting bracket 61 is fixed to a ring member 62 as a loose fitting member. The ring member 62 includes the support 14
Is rotatably loosely fitted on the outer periphery of the column 20. Further, this ring member 62 is provided with a locking pin 63 as a locking member.
Is engaged with the engagement hole 64 of the ring member 62 and the engagement hole 65 as an engagement portion of the column 20, and can be integrally rotated with the column 20. One of the engagement holes 64 is opened in the ring member 62, and the engagement hole 65 is
Are opened at a plurality of locations in the circumferential direction.

The ring member 62 is rotatably connected to the column 20 via the locking pin 63, so that when the swivel cylinder device 18 expands and contracts as shown by the solid line and the two-dot chain line in FIG. The crane boom 15 is pivoted about 90 degrees around the pivot axis 14A, so that the crane boom 15
As shown in FIG. It is provided to be pivotable. Further, by changing the engagement hole 65 with which the locking pin 63 engages, the swiveling region of the crane boom 15 can be changed from, for example, the region of the arrow A to the region of the arrow B.

Further, by pulling out the locking pin 63 from the engaging hole 65 of the column 20, the column 20 is rotatable around the pivot shaft 14 with respect to the ring member 62, and the crane boom 15 can be manually pivoted. Is done. An arrow C shown in FIG. 2 indicates a manually pivotable area (about 135).

Here, as shown in FIGS. 4, 5 and 6, a locking mechanism 66 is connected to the locking pin 63.
The locking mechanism 66 is fixed to the outer circumference of the ring member 62 and is connected to the locking pin 63 through a mounting pin 68 so that the locking pin 63 is inserted therethrough.
9, a grip bracket 70 provided between the support bracket 67 and the locking pin 63.
And a locking spring 71 for urging the locking spring 71 in a direction to be engaged with the engagement holes 64 and 65. The operator grips the grip 69 and the grip bracket 70 and pulls the grip 69 and the grip bracket 70 forward against the urging force of the locking spring 71, so that the locking pin 63 and the locking hole 65 of the column 20 can be moved. The engagement is disengaged.

The above-described swivel cylinder device 18 is extended (that is, the piston rod 55 protrudes from the cylinder 53) by supplying hydraulic oil from the pump device 16 to the piston-side chamber 56A, and the hydraulic oil is supplied to the rod-side chamber 56B. Is supplied (ie, the piston rod 55
Enters the cylinder 53).

[F] Pump Device (No. 1) The pump device 16 is, as shown in FIG.
7 and a gear pump 48 housed in the gear pump 4.
8 connected to the motor 8 via a drive shaft 49
, And The motor 50 includes a tank case 51A liquid-tightly coupled to the pump case 47.
The gear pump 48 is rotationally driven in one of forward and reverse directions. A tank chamber 51 is formed so as to be surrounded by the pump case 47 and the tank case 51A, and a working oil (oil level H) as a working fluid can be stored in the tank chamber 51. Also, in this pump device 16, FIG.
The shuttle valve device 72, the down blow mechanism 73, and the up blow valve 74 shown in FIG.

In the shuttle valve device 72, as shown in FIG. 8, a piston side chamber check valve 76 and a rod side chamber check valve 77 are respectively installed on both sides of a shuttle cylinder 75, and a spool 78 slides inside the shuttle cylinder 75. It was housed freely. At both ends of the spool 78, pressing portions 79 are provided, which press the piston-side chamber check valve 76 and the rod-side chamber check valve 77, respectively, to open the valve. The inside of the shuttle cylinder 75 is partitioned into a piston side chamber 80A and a rod side chamber 80B by a spool 78.

The gear pump 48 of the pump device 16 has a first
The piston-side chamber flow path 81, the piston-side chamber 80A of the shuttle valve device 72, and the piston-side chamber check valve 76 are connected to the second piston-side chamber flow path 82. Gear pump 4
8 passes through the first rod side chamber flow path 91, the rod side chamber 80 </ b> B of the shuttle valve device 72 and the rod side chamber check valve 77, and
It is connected to the rod side chamber flow path 92. Furthermore, the gear pump 4
8 is connected to the tank chamber 51 via a first tank flow path 86 and a second tank flow path 87. The down blow mechanism 73 and the up blow valve 74 will be described later.

[G] Channel Switching Device (Part 1) As shown in FIG. 8, a channel switching device 19 is a pump device (this channel switching device 19 will be described later in detail with reference to FIGS. 9 to 16). The hydraulic fluid from the pump 16 can be selectively supplied to the lifting / lowering cylinder device 17 and the revolving cylinder device 18 by switching the flow path. The rotary switching valve 88, the lifting / lowering shuttle valve 89, and the revolving shuttle valve 90.

[G-1] Switching Valve The switching valve 88 connects the third piston side chamber flow path 83 connected to the port 100 of the second piston side chamber flow path 82 in the pump device 16 to the fourth piston side chamber flow path 84 or Switching to the fourth piston side chamber flow path 96, and further changing the third rod side chamber flow path 93 connected to the port 101 of the second rod side chamber flow path 92 in the pump device 16 to the fourth rod side chamber flow path 9
The fourth or fourth rod side chamber flow path 98 is switched.

Therefore, the switching operation of the switching valve 88 to the raising / lowering position side causes the piston-side chamber 35A of the lifting / lowering cylinder device 17 to move to the fifth piston-side chamber flow path 85, the fourth piston-side chamber flow path 84, and the third piston-side chamber flow path 83. Can be connected to the port 100 of the pump device 16 through
The rod-side chamber 35B of the elevating cylinder device 17 can communicate with the port 101 of the pump device 16 via the fifth rod-side chamber flow path 95, the fourth rod-side chamber flow path 94, and the third rod-side chamber flow path 93. Further, by the switching operation of the switching valve 88 to the swing position side, the piston side chamber 56A of the swing cylinder device 18 is pumped through the fifth piston side chamber flow path 97, the fourth piston side chamber flow path 96, and the third piston side chamber flow path 83. At the same time as being able to communicate with the port 100 of the device 16, the rod-side chamber 56B of the swivel cylinder device 18 is connected to the pump device via the fifth rod-side chamber flow channel 99, the fourth rod-side chamber flow channel 98, and the third rod-side chamber flow channel 93. 16 ports 101
Can be communicated with.

[G-2] Elevating Shuttle Valve, Revolving Shuttle Valve The elevating shuttle valve 89 is disposed between the elevating cylinder device 17 and the switching valve 88. Further, the turning side shuttle valve 90 is disposed between the turning cylinder device 18 and the switching valve 88.

That is, the lifting / lowering side shuttle valve 89 includes the piston side chamber shuttle valve section 102 and the rod side chamber shuttle valve section 1.
03 are connected by a communication path 104. The piston side chamber check valve 105 of the piston side chamber shuttle valve section 102 is communicated with the fourth piston side chamber flow path 84 and the fifth piston side chamber flow path 85. Further, the rod-side chamber check valve 106 of the rod-side chamber shuttle valve section 103 is connected to the fourth rod-side chamber flow path 94 and the fifth rod-side chamber flow path 95.

The swivel-side shuttle valve 90 includes a piston-side chamber shuttle valve 107 and a rod-side chamber shuttle valve 10.
8 are communicated by the communication path 109. The piston-side chamber check valve 105 of the piston-side chamber shuttle valve section 107 is connected to the fourth piston-side chamber flow path 96 and the fifth piston-side chamber flow path 97. Further, the rod-side chamber check valve 106 of the rod-side chamber shuttle valve section 108 is communicated with the fourth rod-side chamber flow path 98 and the fifth rod-side chamber flow path 99.

The lifting shuttle valve 89 and the turning shuttle valve 90 have the same structure. That is, the piston side chamber shuttle valve portions 102 and 107 are
0, a spool 112 provided with a piston side chamber operation check valve 111 is slidably housed therein, and the inside of the shuttle cylinder 110 is divided into a main oil chamber 113 and a sub oil chamber 114. A piston side chamber check valve 105 is provided at 113.

Further, the rod side chamber shuttle valves 103, 1
Reference numeral 08 denotes a shuttle cylinder 115 in which a spool 117 provided with a rod-side chamber operation check valve 116 is slidably accommodated.
18 and a sub oil chamber 119, and a rod side chamber check 106 is provided on the main oil chamber 118 side.

A sub-oil chamber 114 of the piston-side chamber shuttle valve portion 102 of the lifting / lowering-side shuttle valve 89 and a sub-oil chamber 119 of the rod-side chamber shuttle valve portion 103 communicate with the communication passage 104.
Are connected. A sub-oil chamber 114 of the piston-side chamber shuttle valve portion 107 of the swivel-side shuttle valve 90;
The sub oil chamber 119 of the rod side chamber shuttle valve section 108 is connected by a communication passage 109.

The piston side chamber shuttle valve portions 102 and 107
Of the piston side chamber check valve 105
When the spool 112 moves toward the piston side chamber check valve 105 due to an increase in the pressure in the sub oil chamber 114, the pressing section 120 presses the piston side chamber check valve 105 to open. Valve is possible. The spool 117 of the rod-side chamber shuttle valves 103 and 108 also has a pressing part 121 formed on the rod-side chamber check valve 106 side. When the spool 117 moves toward the rod-side chamber check valve 106 due to an increase in the pressure in the sub oil chamber 119, the pressing portion 121 presses the rod chamber-side check valve 106 to open the valve.

As described above, the up / down shuttle valve 89 includes the piston-side chamber check valve 105 and the rod-side chamber check valve 1.
06 block the flow of hydraulic oil from the piston-side chamber 35A and the rod-side chamber 35B of the lifting cylinder device 17 to the switching valve 88. Further, the lift side shuttle valve 8
Reference numeral 9 denotes a piston-side chamber operation check valve 111 and a rod-side chamber operation check valve 116 when the piston-side chamber check valve 105 is opened due to the flow of hydraulic oil into the main oil chamber 113.
The rod-side chamber check valve 106 is opened by the action of the pressing portion 121 (described later), and the piston-side chamber 35A of the elevating cylinder device 17 from the switching valve 88 via the fourth piston-side chamber flow path 84 and the fifth piston-side chamber flow path 85. And the flow of hydraulic oil from the rod-side chamber 35B of the lifting / lowering cylinder device 17 to the switching valve 88 via the fifth rod-side chamber flow path 95 and the fourth rod-side chamber flow path 94 is allowed. Also,
When the rod-side chamber check valve 106 is opened due to the flow of hydraulic oil into the main oil chamber 118, the lifting / lowering side shuttle valve 89 operates the rod-side chamber operation check valve 116, the piston-side chamber operation check valve 111, and the pressing portion 120 (described later). )
, The piston side chamber check valve 105 opens, and the switching valve 8
8 through the fourth rod side chamber flow path 94 and the fifth rod side chamber flow path 95 toward the rod side chamber 35B of the lifting / lowering cylinder device 17, and from the piston side chamber 35A of the lifting / lowering cylinder device 17 to the fifth piston side chamber flow path. The flow of the working oil toward the switching valve 88 via the 85 and the fourth piston side chamber flow path 84 is allowed.

In the revolving shuttle valve 90, the piston-side chamber check valve 105 and the rod-side chamber check valve 106 prevent the flow of hydraulic oil from the piston-side chamber 56A and the rod-side chamber 56B of the revolving cylinder device 18 toward the switching valve 88. . Further, when the piston-side chamber check valve 105 is opened due to the flow of the hydraulic oil into the main oil chamber 113, the turning-side shuttle valve 90 opens the piston-side chamber operation check valve 111, the rod-side chamber operation check valve 116, and the pressing portion 1
The rod-side chamber check valve 106 is opened by the operation of 21 (described later), and the lift cylinder device 18 is switched from the switching valve 88 through the fourth piston-side chamber flow path 96 and the fifth piston-side chamber flow path 97.
And the switching valve 88 from the rod side chamber 56B of the revolving cylinder device 18 via the fifth rod side chamber flow path 99 and the fourth rod side chamber flow path 98.
Allows the flow of hydraulic oil toward. When the turning-side shuttle valve 90 opens the rod-side chamber check valve 106 due to the flow of hydraulic oil into the main oil chamber 118, the operation of the rod-side chamber operation check valve 116, the piston-side chamber operation check valve 111, and the pressing portion 120 is performed. (Described later), the piston-side chamber check valve 105 is opened, and the flow of hydraulic oil from the switching valve 88 to the rod-side chamber 56B of the revolving cylinder device 18 via the fourth rod-side chamber flow path 98 and the fifth rod-side chamber flow path 99. And the piston side chamber 56A of the swing cylinder device 18
Through the fifth piston side chamber flow path 97 and the fourth piston side chamber flow path 96 to the switching valve 88.

[H] Pump device 16 and flow path switching device 19
[H-1] Flow of Hydraulic Oil when Switching Valve 88 is in the Up / Down Position By switching the switching valve 88 to the up / down position, the port 100 of the pump device 16 causes the third piston side chamber flow path 8
3 and the port 101 is in communication with the fourth rod side chamber flow path 94 via the third rod side chamber flow path 93 when the port 101 is in communication with the fourth rod side chamber flow path 94 via the third rod side chamber flow path 93.
The hydraulic oil from 6 is not supplied to the swing cylinder device 18, but is supplied only to the piston side chamber 35 </ b> A and the rod side chamber 35 of the lifting cylinder device 17. The hydraulic oil in the piston side chamber 56A and the rod side chamber 56B of the swing cylinder device 18 is as follows:
Due to the closing action of the piston-side chamber check valve 105 and the rod-side chamber check valve 106 of the swivel-side shuttle valve 90, they do not flow out, and the operation of the swivel cylinder device 18 is locked.

At this time, the gear pump 4 of the pump device 16
8 rotates forward, the gear pump 48
As shown by the solid arrows in FIG. 8, the hydraulic oil in the inside is guided into the piston side chamber 80A of the shuttle valve device 72 via the first tank flow path 86 and the first piston side chamber flow path 81. The hydraulic oil guided into the piston side chamber 80A opens the piston side chamber check valve 76, presses the spool 78 toward the rod side chamber 80B, and opens the rod side chamber check valve 77 at the pressing portion 79. Give a valve.

When the piston-side chamber check valve 76 is opened, the hydraulic oil in the piston-side chamber 80A causes the second-piston-side chamber flow path 82, the port 100, and the third-piston-side chamber flow path as shown by the solid arrows in FIG. The liquid is guided into the main oil chamber 113 of the piston side chamber shuttle valve portion 102 of the elevating side shuttle valve 89 via the switching valve 88, the switching valve 88 and the fourth piston side flow path 84. The hydraulic oil guided into the main oil chamber 113 of the piston side chamber shuttle valve 102 opens the piston side chamber check valve 1053 of the piston side chamber shuttle valve 102 and checks the piston side chamber operation of the piston side chamber shuttle valve 102. The valve 111 is opened, and the sub oil chamber 114 and the communication passage 104 of the piston side chamber shuttle valve section 102 are opened.
Through the sub oil chamber 119 of the rod side chamber shuttle valve section 103
Flows into the interior. At this time, the rod side chamber shuttle valve 10
3 is in the closed state, the spool 117 of the rod-side chamber shuttle valve portion 103 is closed.
Moves toward the rod-side chamber check valve 106, and the rod-side chamber check valve 10
Press 6 to open the valve.

When the piston-side chamber check valve 105 of the piston-side chamber shuttle valve 102 is opened, the hydraulic oil in the main oil chamber 113 of the piston-side chamber shuttle valve 102 becomes the fifth piston as shown by the solid arrow in FIG. Side chamber channel 85
And reaches the inside of the piston side chamber 35A of the lifting cylinder device 17. Also, the rod side chamber 35B of the lifting cylinder device 17
Hydraulic oil inside the fifth rod-side chamber flow path 95, the rod-side chamber check valve 106 of the rod-side chamber shuttle valve unit 103 (in an open state), the fourth rod-side chamber flow path 94, the switching valve 88, and the third rod-side chamber flow path 93, the port 101 of the pump device 16, the second rod-side chamber flow path 92, the rod-side chamber check valve 77 of the shuttle valve device 72 (in an open state), and the first rod-side chamber flow path 91 are guided to the gear pump 48.

As a result, the piston 33 moves in the direction in which the piston rod 34 of the lifting / lowering cylinder device 17 projects from the cylinder 32, the extension / lowering cylinder device 17 is extended, and the crane boom 15 shown in FIG. The ascending operation is performed around the support shaft 24.

When the gear pump 48 of the pump device 16 rotates in the reverse direction, the gear pump 48 supplies the hydraulic oil in the tank chamber 51 to the second tank flow path 87 and the first rod chamber side flow path 91 as shown by the broken arrows in FIG. Through the shuttle valve device 72 into the rod side chamber 80B. The hydraulic oil guided into the rod side chamber 80B opens the rod side chamber check valve 77, moves the spool 78 in the direction of the piston side chamber 80A, and opens the piston side chamber check valve 76 at the pressing portion 79. Set to valve state.

When the rod-side chamber check valve 77 is opened, the hydraulic oil in the rod-side chamber 80B receives the second rod-side chamber flow path 92, the port 101, and the third rod-side chamber flow path as shown by the broken arrows in FIG. 93, switching valve 88 and fourth rod side chamber flow path 9
4, the liquid is guided into the main oil chamber 118 of the rod-side chamber shuttle valve portion 103 of the elevating shuttle valve 89. The hydraulic oil guided into the main oil chamber 118 of the rod side chamber shuttle valve 103 opens the rod side chamber check valve 106 of the rod side chamber shuttle valve 103 and the rod side chamber operation check valve of the rod side chamber shuttle valve 103. 11
The valve 6 is opened, and flows into the sub oil chamber 114 of the piston side chamber shuttle valve 102 via the sub oil chamber 119 and the communication passage 104 of the rod side chamber shuttle valve 103. At this time,
Since the piston side chamber operation check valve 111 of the piston side chamber shuttle valve section 102 is in the closed state, the spool 112 of the piston side chamber shuttle valve section 102 moves toward the piston side chamber check valve 105, The piston side chamber check valve 105 is pressed to open.

When the rod-side chamber check valve 106 of the rod-side chamber shuttle valve 103 is opened, the operating oil in the main oil chamber 118 of the rod-side chamber shuttle valve 103 is displaced by the fifth rod as shown by a broken arrow in FIG. Through the side chamber flow path 95, it reaches the inside of the rod side chamber 35B of the lifting cylinder device 17. The hydraulic oil in the piston-side chamber 35A of the lifting / lowering cylinder device 17 is supplied to the fifth piston-side chamber flow path 85, the piston-side chamber check valve 105 (opened state) of the piston-side chamber shuttle valve unit 102, the fourth piston-side chamber flow path 84, Switching valve 88, third
Piston side chamber flow path 83, port 10 of pump device 16
0, the second piston side chamber flow path 82, the piston side chamber check valve 76 of the shuttle valve 72 (opened state), and the first piston side chamber flow path 81 are guided to the gear pump 48.

As a result, the piston 33 moves in the direction in which the piston rod 34 of the lifting / lowering cylinder device 17 enters the cylinder 32, and the lifting / lowering cylinder device 17 contracts, and the crane boom 15 of FIG. It is operated downward about the pivot 24.

[H-2] Flow of Hydraulic Oil when the Switching Valve 88 is in the Swing Position The port 100 of the pump device 16 is switched to the third piston side chamber flow path 8 by the switching operation of the switching valve 88 to the swing position.
3 and the port 101 is in communication with the fourth rod-side chamber flow path 98 via the third rod-side chamber flow path 93 when the port 101 is in communication with the fourth rod-side chamber flow path 98.
The hydraulic oil from 6 is not supplied to the lifting cylinder device 17 but is supplied only to the piston side chamber 56A and the rod side chamber 56B of the revolving cylinder device 18. Lifting cylinder device 17
The hydraulic oil in the piston-side chamber 35A and the rod-side chamber 35B does not flow out due to the closing action of the piston-side chamber check valve 105 and the rod-side chamber check valve 106 in the lift shuttle valve 89, and the operation of the lift cylinder device 17 is locked. You.

At this time, the gear pump 4 of the pump device 16
8, the hydraulic oil in the tank chamber 51 flows through the first tank flow path 86 and the first piston side chamber flow path 81 as shown by the solid arrow in FIG. The piston side chamber check valve 76 is opened, and the rod side chamber check valve 77 is opened by the action of the pressing portion 79.

By opening the piston-side chamber check valve 76, the hydraulic oil in the piston-side chamber 80A flows into the second piston-side chamber flow path 82 and the pump device 1 as shown by the one-dot chain line in FIG.
6, via the third piston-side chamber flow path 83, the switching valve 88, and the fourth piston-side chamber flow path 96, the fluid is guided into the main oil chamber 113 of the piston-side chamber shuttle valve portion 107 of the swivel-side shuttle valve 90. The hydraulic oil guided into the main oil chamber 113 of the piston side chamber shuttle valve 107 opens the piston side chamber check valve 105 of the piston side chamber shuttle valve 107 and checks the piston side chamber operation of the piston side chamber shuttle valve 107. The valve 111 is opened, and the sub oil chamber 1 of the piston side chamber shuttle valve 107 is opened.
The fluid flows into the sub oil chamber 119 of the rod-side chamber shuttle valve section 108 through the communication passage 14 and the communication passage 109. At this time, since the rod-side chamber operation check valve 116 of the rod-side chamber shuttle valve 108 is in the closed state, the spool 117 of the rod-side chamber shuttle valve 108 is
Then, the rod side chamber check valve 106 of the rod side chamber shuttle valve section 108 is pressed to open.

When the piston-side chamber check valve 105 of the piston-side chamber shuttle valve 107 is opened, the hydraulic oil in the main oil chamber 113 of the piston-side chamber shuttle valve 107 is moved to the first position as shown by the one-dot chain line arrow in FIG. The piston-side chamber 56A of the swivel cylinder device 18 via the 5-piston-side chamber flow path 97
Inside. Further, the rod-side chamber 5 of the swing cylinder device 18
The hydraulic oil in 6B is supplied to the fifth rod-side chamber flow path 99 and the rod-side chamber check valve 106 of the rod-side chamber shuttle valve unit 108.
(Valve open state), fourth rod side chamber flow path 98, switching valve 88,
Third rod side chamber passage 93, port 10 of pump device 16
1, the second rod side chamber flow path 92, the rod side chamber check valve 77 of the shuttle valve device 72 (opened state), and the first rod side chamber flow path 91 are guided to the gear pump 48.

As a result, the piston 54 moves in the direction in which the piston rod 55 of the swing cylinder device 18 projects from the cylinder 53, the swing cylinder 18 is extended, and the crane boom 15 shown in FIG. It is operated around.

When the gear pump 48 of the pump device 16 rotates in the reverse direction, the hydraulic oil in the tank chamber 51 passes through the second tank flow path 87 and the first rod side chamber flow path 91 as shown by the dashed arrow in FIG. Rod side chamber 80 of shuttle valve device 72
It is guided into B, the rod-side chamber check valve 77 opens, and the piston-side chamber check valve 76 opens by the action of the pressing portion 79.

When the rod-side chamber check valve 77 is opened, the hydraulic oil in the rod-side chamber 80B flows through the second rod-side chamber flow path 92, the port 101, and the third rod as shown by the two-dot chain line arrow in FIG.
Through the rod-side chamber flow passage 93, the switching valve 88, and the fourth rod-side chamber flow passage 98, it is guided into the main oil chamber 118 of the rod-side chamber shuttle valve section 108 of the swivel-side shuttle valve 90. The main oil chamber 1 of the rod side chamber shuttle valve section 108
Hydraulic oil guided into 18 is rod side chamber shuttle valve 1
08, the rod side chamber check valve 106 of the rod side chamber shuttle valve section 108 is opened, and the rod side chamber operation check valve 116 of the rod side chamber shuttle valve section 108 is opened.
8 through the sub oil chamber 119 and the communication passage 109, and flows into the sub oil chamber 114 of the piston side chamber shuttle valve portion 107. At this time, since the piston-side chamber operation check valve 111 of the piston-side chamber shuttle valve unit 107 is in the closed state,
The spool 112 of the piston side chamber shuttle valve 107 is
The piston-side chamber check valve 105 moves toward the piston-side chamber check valve 105, and presses the piston-side chamber check valve 105 of the piston-side chamber shuttle valve 107 to open it.

When the rod-side chamber check valve 106 of the rod-side chamber shuttle valve 108 is opened, the operating oil in the main oil chamber 118 of the rod-side chamber shuttle valve 108 is changed to 2 in FIG.
As shown by the dashed-dotted line arrow, the fluid enters the rod-side chamber 56B of the revolving cylinder device 18 via the fifth rod-side chamber flow path 99.
The hydraulic oil in the piston-side chamber 56A of the revolving cylinder device 18 is supplied to the fifth piston-side chamber flow path 97, the piston-side chamber check valve 105 of the piston-side chamber shuttle valve unit 107 (opened state), the fourth piston-side chamber flow path 96, Switching valve 88, third piston side chamber flow path 83, port 10 of pump device 16
0, the second piston side chamber flow path 82, the piston side chamber check valve 76 of the shuttle valve device 72 (opened state), and the first piston side chamber flow path 81 are guided to the gear pump 48.

As a result, the piston 54 moves in the direction in which the piston rod 55 of the swivel cylinder device 18 enters the cylinder 53, the swivel cylinder device 18 contracts, and the crane boom 15 shown in FIG. Axis 14
A turning operation is performed around A.

[I] Pump Device (No. 2) Here, the down blow mechanism 73 provided in the pump device 16 is connected to the rod side chamber 80B of the shuttle valve device 72, and the up blow valve 74 is It is connected to the piston side chamber flow path 82.

The down blow mechanism 73 includes a down blow orifice 122 and a check valve 123. The down blow mechanism 73 is provided with the lifting cylinder device 1
7, the piston rod 34 which enters the respective cylinders 32, 53 when the revolving cylinder device 18 is contracted,
The hydraulic oil corresponding to the volume of 55 is introduced into the tank chamber 51. Further, even when the pistons 33 and 54 are in the most contracted positions, the excess hydraulic oil is supplied to the tank when the gear pump 48 is operating in reverse. Lead to room 51.

The up-blow valve 74 is operated when the gear pump 48 is rotating forward even when the pistons 33 and 54 are at the most extended position when the lifting cylinder device 17 and the revolving cylinder device 18 are extended. Then, excess hydraulic oil is guided into the tank chamber 51.

[J] Channel Switching Device (Part 2) In the channel switching device 19, the fifth piston side chamber channel 85 and the fifth rod side chamber channel 95 can be connected via the communication channel 124. A manual valve 125 and a thermal valve 126 are provided in the passage 124. The fifth piston side chamber flow path 85 is the piston side chamber 3 of the lifting cylinder device 17.
5A communicates with the piston-side chamber shuttle valve portion 102 of the lifting-side shuttle valve 89. The fifth rod-side chamber flow path 95 is connected to the rod-side chamber 35B of the lifting cylinder device 17.
And the rod side chamber shuttle valve portion 10 of the lifting side shuttle valve 89
3 is communicated.

Further, in the flow path switching device 19, the fifth piston side chamber flow path 97 and the fifth rod side chamber flow path 99 can be connected through a communication passage 127, and the manual valve 128 and the thermal valve A valve 129 is provided. The fifth piston-side chamber flow path 97 is provided between the piston-side chamber 56 </ b> A of the swing cylinder device 18 and the swing-side shuttle valve 90.
The fifth rod-side chamber flow path 99 communicates with the rod-side chamber 56B of the revolving cylinder device 18 and the revolving-side shuttle valve 9.
0 and the rod side chamber shuttle valve portion 108.

These manual valves 125 and 12
8, the thermal valves 126 and 129 are passed through a first return flow path 130 formed in the flow path switching device 19, a port 131 of the pump device 16 and a second return flow passage 132 of the pump device 16 to provide a down blow mechanism 73. Is connected to the tank chamber 51 via the

When the manual valve 125 is manually opened by an operator, the lifting cylinder device 17 is opened.
The piston side chamber 35A and the rod side chamber 35B are in communication with each other, and the crane boom 15 shown in FIG.
0 can be moved up and down around the pivot shaft 24. When the manual valve 128 is manually opened by an operator, the piston-side chamber 56A and the rod-side chamber 56B of the revolving cylinder device 18 are brought into communication with each other. Even if the member 62 is integrated, the crane boom 15 shown in FIG.
Can be manually turned around the turning axis 14A of the support column 14.

The thermal valve 126 operates when the volume of hydraulic oil in the piston side chamber 35A and the fifth piston side chamber flow path 85 of the lifting / lowering cylinder device 17 increases due to a temperature change. When the volume of hydraulic oil in the piston-side chamber 56A and the fifth rod-side chamber flow path 99 of the turning cylinder device 18 increases, the increased hydraulic oil is transferred to the first return flow path 130, the second return flow path 132, This escapes to the tank chamber 51 via the down blow mechanism 73. Note that reference numeral 133 in FIG. 8 indicates a filter.

The piston 3 of the lifting cylinder device 17
3, a thermal valve 140 is provided, and a thermal valve 145 is provided on the piston 54 of the swing cylinder device 18. The thermal valve 140 opens when the hydraulic oil in the rod side chamber 35B of the elevating cylinder device 17 increases in volume due to a temperature change, and the increased hydraulic oil is thermally transferred through the piston side chamber 35A and the fifth piston side chamber flow path 85. After leading to the valve 126 and opening this thermal valve 126, the thermal valve 126 is released to the tank chamber 51 via the first return flow path 130, the second return flow path 132 and the down blow mechanism 73.

The thermal valve 145 opens when the hydraulic oil in the rod side chamber 56B of the swivel cylinder device 18 increases in volume due to a temperature change, and the increased hydraulic oil flows through the piston side chamber 56A and the fifth rod side chamber flow. It is led to the thermal valve 129 via the path 97, and the thermal valve 1
After the valve 29 is opened, the gas is released to the tank chamber 51 via the first return flow path 130, the second return flow path 132, and the down blow mechanism 73.

[K] Specific Structure of Channel Switching Device The specific structure of the channel switching device 19 described above is shown in FIG.
This will be described with reference to FIGS.

As shown in FIGS. 9 to 11, the casing 134 of the flow path switching device 19 has a cam shaft 135, which constitutes the switching valve 88, and a first poppet valve 1 at its central position.
36, a second poppet valve 137, a third poppet valve 138 and a fourth poppet valve 139 are arranged. In addition, the casing 134 includes a piston-side chamber shuttle valve portion 102 and a rod-side chamber shuttle valve portion 103 of the lift shuttle valve 89 and a piston-side chamber shuttle valve portion 107 and a rod Side chamber valve 10
8 are arranged. Further, in the casing 134, a manual valve 125 containing a thermal valve 126 is provided above the elevating shuttle valve 89 in FIG. 9, and a manual valve containing a thermal bubble 129 is provided above the swivel shuttle valve 90 in FIG. 128 are arranged respectively.

[K-1] Specific Structure of Switching Valve The camshaft 135 is provided with an oil chamber of a cylinder device (a piston side chamber 35A and a rod side chamber 35B of a lifting cylinder device 17;
The same number of first cams 141, second cams 142 as the piston side chambers 56A and the rod side chambers 56B) of the revolving cylinder device 18,
The third cam 143 and the fourth cam 144 are arranged side by side in the axial direction. 1st cam 141, 2nd cam 142, 3rd
As shown in FIG. 9, the center of each of the cam 143 and the fourth cam 144 is formed as an eccentric circle eccentric from the axis of the cam shaft 135. As shown in FIG. 16, a grip base 146 is attached to one end of the cam shaft 135, and the grip 1 screwed to the grip base 146 is mounted.
47 prevents the grip base 146 from being pulled out of the camshaft 135, and the camshaft 135 is provided rotatably around the axis.

The casing 134 and the grip base 14
6, a detent mechanism 150 including a positioning hole 148 and a positioning ball 149 is provided. The positioning hole 148 is 180 in the casing 134. Two will be opened at the opposite position. The positioning ball 149 is biased by a spring 151 so that it can be fitted into one of the positioning holes 148. Thereby, the cam shaft 135 and the grip 147 are positioned at the elevating position and the turning position shown in FIGS.

The casing 134 has a grip 14
A detent pin 152 for regulating the position of No. 7 is implanted. The camshaft 135 has a grip base 146 side,
It is sealed by an oil seal 140 held by a casing 134.

In particular, as shown in FIGS. 10 and 11, the first poppet valve 136 is controlled by the first cam 141, the second poppet valve 137 is controlled by the second cam 142, and the third poppet valve 138 is controlled by the third cam 143. , Fourth poppet valve 139
Are rotatably operated by the fourth cams 144, respectively. The fourth poppet valve 139 is connected to the third piston side chamber flow path 8.
3 is connected to the up / down shuttle valve 89.
Can communicate with the fourth piston side chamber flow path 84 connected to the piston side chamber shuttle valve section 102, and the piston side chamber 3 of the lift cylinder device 17 through the fifth piston side chamber flow path 85.
5A.

Also, the first poppet valve 136 is connected to the casing 134 side flow path of the third piston side chamber flow path 83 similarly.
Piston side chamber shuttle valve section 10 of swivel side shuttle valve 90
7, and can communicate with the piston-side chamber 56A of the revolving cylinder device 18 via the fifth piston-side chamber flow path 97.

Further, the second poppet valve 137 connects the flow path on the casing 134 side of the third rod side chamber flow path 93 to the fourth rod side chamber flow path 94 connected to the rod side chamber shuttle valve section 103 of the elevating shuttle valve 89. The rod side chamber 3 of the elevating cylinder 17 can be connected through the fifth rod side chamber flow path 95.
5B.

The third poppet valve 138 connects the casing-side flow path of the third rod-side chamber flow path 93 to the fourth rod-side chamber flow path 98 connected to the rod-side chamber shuttle valve section 108 of the revolving shuttle valve 90. It is made possible to communicate with the rod side chamber 56B of the revolving cylinder device 18 via the fifth rod side chamber flow path 99.

The fourth poppet valve 139 and the second poppet valve 137 are simultaneously opened by the fourth cam 144 and the second cam 142 when the camshaft 135 and the grip 147 are in the elevating position, respectively. When the grip 147 is in the turning position, the closing operation is simultaneously performed by the fourth cam 144 and the second cam 142, respectively. The first poppet valve 136 and the third poppet valve 138 are simultaneously closed by the first cam 141 and the third cam 143 when the camshaft 135 and the grip 147 are in the elevating position, respectively. When the 147 is in the turning position, the opening operation is simultaneously performed by the first cam 141 and the third cam 143, respectively.

Thus, the cam shaft 135 and the grip 1
When 47 is in the elevating position, the third piston side chamber flow path 83 connected to the port 100 of the pump device 16
Is connected to the piston-side chamber 35A of the elevating cylinder device 17 through the fourth piston-side chamber flow path 84, the piston-side chamber shuttle valve portion 102, and the fifth piston-side chamber flow path 85, and is connected to the third rod connected to the boat 101. Side chamber channel 93
Is connected to the rod-side chamber 35B of the lifting cylinder device 17 via the fourth rod-side chamber flow path 94, the rod-side chamber shuttle valve 103, and the fifth rod-side chamber flow path 95.

When the camshaft 135 and the grip 147 are in the turning position, the third piston-side chamber flow path 83, the fourth piston-side chamber flow path 96, the piston-side chamber shuttle valve 107, and the fifth piston-side chamber flow path 97 The third rod-side chamber flow path 93 is communicated with the piston-side chamber 56A of the revolving cylinder device 18 via a fourth rod-side chamber flow path 98, a rod-side chamber shuttle valve section 108, and a fifth rod-side chamber flow path 99. Thus, it is communicated with the rod side chamber 56B of the turning cylinder device 18.

[K-2] Specific Configuration of the Up / Down Shuttle Valve and the Swivel Shuttle Valve The up / down shuttle valve 89 and the swivel shuttle valve 90 are shown in FIG.
As shown in FIG. 12, the swing-side shuttle valve 90 is shown in FIG. 12, and in FIG. 9, the rod-side chamber shuttle valve part 103 of the lifting-side shuttle valve 89 and the piston-side chamber shuttle valve part of the swing-side shuttle valve 90 are shown. 107 are shown. The structure of the lifting / lowering side shuttle valve 89 is denoted by the same reference numeral as that of the turning side shuttle valve 90, and description thereof is omitted.

As shown in FIG. 12, the turning-side shuttle valve 9
0, the piston-side chamber check valve 105 of the piston-side chamber shuttle valve unit 107 is provided in the valve case 153 with the valve member 1.
The valve member 154 is slidably disposed, and the valve member 154 is configured to be opened and closed by being biased by a spring 156 supported by a spring retainer 155. These valve cases 153,
The valve member 154, the spring retainer 155, and the spring 156 are integrally formed as a cartridge, and are detachably accommodated in the valve accommodation hole 157 of the casing 134. The piston side chamber check valve 105 communicates with the casing 134 side flow path of the fifth piston side chamber flow path 97.

The spool 112 of the piston side chamber shuttle valve portion 107 is slidably disposed in a valve accommodation hole 157 as the shuttle cylinder 110, has a pressing portion 120, and has a built-in piston side chamber operation check valve 111. . The main oil chamber 113 defined by the spool 112 communicates with the fourth piston side chamber flow path 96, and through a communication hole 163 formed in the spool 112,
The piston side chamber operation check valve 111 at the time of valve opening communicates with the sub oil chamber 114. Also, this sub oil chamber 114
Is connected to the rod side chamber shuttle valve section 108 through the communication passage 109.
Is connected to the sub oil chamber 119.

The rod-side chamber check valve 106 of the rod-side chamber shuttle valve section 108 of the swivel-side shuttle valve 90 is
A valve member 159 is slidably disposed in the valve case 158. The valve member 159 is configured to be opened and closed by being biased by a spring 161 supported by a spring retainer 160. The valve case 158, the valve member 159, the spring retainer 160, and the spring 161 are integrally formed into a cartridge, and are removably housed in the valve housing hole 162 of the casing 134. This rod side chamber check valve 106
The rod-side chamber flow path 99 communicates with the casing 134-side flow path.

The spool 117 of the rod side chamber shuttle valve portion 108 is slidably disposed in a valve housing hole 162 as the shuttle cylinder 115, has a pressing portion 121, and has a built-in rod side chamber operation check valve 116. . The main oil chamber 1 defined by the spool 117
The sub-oil chamber 119 communicates with the fourth rod-side chamber flow path 98 and through a communication hole 164 formed in the spool 117 by the rod-side chamber operation check valve 116 when the valve is opened.
Is communicated to. The sub oil chamber 119 communicates with the sub oil chamber 114 of the piston side chamber shuttle valve 107 via the communication passage 109 as described above.

As shown in FIG. 11, when the camshaft 135 and the grip 147 are in the turning position, the first poppet valve 136 and the third poppet valve 138 of the switching valve 88 are opened, and the fourth poppet valve 139 and the fourth poppet valve 139 are opened. 2 poppet valve 13
When the valve 7 is closed, the piston-side chamber shuttle valve portion 107 of the swivel-side shuttle valve 90 shown in FIG. 105 is opened, the spool 112 moves to the communication path 109 side, and the pressing portion 121 of the spool 117 of the rod side chamber shuttle valve 108 opens the rod side chamber check valve 106. By opening the piston-side chamber check valve 105 of the piston-side chamber shuttle valve portion 107, the hydraulic oil in the main oil chamber 113 flows to the piston-side chamber 56A of the revolving cylinder device 18 via the fifth piston-side chamber flow path 97, Side room shuttle valve 1
07, the hydraulic oil in the rod-side chamber 56B of the swivel cylinder device 18 is displaced by the fifth rod-side chamber flow path 99 and the rod-side chamber check valve 106.
Through the fourth rod-side chamber flow path 98.

At this time, the piston-side chamber check valve 105 of the piston-side chamber shuttle valve portion 102 of the lifting / lowering-side shuttle valve 89 is closed, and the rod-side chamber check valve 106 of the rod-side chamber shuttle valve portion 103 is also closed as shown in FIG. The valve is closed.

[K-3] Specific Structures of Manual Valve and Thermal Valve A manual valve 125 having a built-in thermal valve 126 shown in FIG. 10 and a manual valve 128 having a built-in thermal valve 129 have the same structure. 1 shows the structure of the manual valve 128, and the structure of the manual valve 125 is denoted by the same reference numeral.

As shown in FIG. 12, the manual valve 1
28 has a built-in thermal valve 129 and a screw 170
To the valve housing hole 165
Housed within. This valve housing hole 165 communicates with a communication passage 127 that communicates with the casing 134 side flow path of the fifth piston side chamber flow path 97, and communicates with the casing 134 side flow path of the fifth rod side chamber flow path 99. The first return flow path 130 communicates with the flow path on the casing 134 side.

The thermal valve 129 is a valve seat 1
A valve ball 167 is provided in the valve 66 so as to be able to contact and separate therefrom. The valve ball 167 is pressed against a valve seat 166 by a ball retainer 169 urged by a spring 168. It is supported by a manual valve 128. The manual valve 128 has a through hole 1.
73 are formed.

When the hydraulic oil in the piston-side chamber 56A and the fifth piston-side chamber flow path 97 of the swivel cylinder device 18 expands in volume as the temperature rises, the expanded hydraulic oil causes the valve ball 167 to separate from the valve seat 166. To open the thermal valve 129, the through hole 173 and the first gap 171.
(To be described later), reaches the first return channel 130, and is discharged to the tank chamber 51.

Further, a screw 170 is attached to the casing 134.
When the manual valve 128 screwed in is loosened and the manual valve 128 is moved in the release direction (α direction in FIG. 12), the spring biasing force of the spring 168 does not act on the valve ball 167, and the communication passage 127 Is the first return channel 130
The hydraulic oil in the piston side chamber 56A and the fifth piston side chamber flow path 97 of the swivel cylinder device 18 is discharged to the tank chamber 51, and at the same time, the first clearance between the valve housing hole 165 and the manual valve 128. 171 and the second gap 172 are in communication with each other, the fifth rod-side chamber flow path 99 communicates with the first return flow path 130, and the rotary cylinder device 1
The hydraulic oil in the eighth rod-side chamber 56B and the fifth rod-side chamber flow path 99 is discharged to the tank chamber 51.

A manual valve 125 shown in FIG. 10 has a built-in thermal valve 126, is screwed into a casing 134 by a screw portion 170, and is housed in a valve housing hole 174. The valve housing hole 174 is provided in the fifth piston-side flow path 85.
And a casing 13 of the fifth rod-side chamber flow path 95.
The first return flow path 130 communicates with the fourth flow path, and further communicates with the casing 134 flow path of the first return flow path 130. The thermal valve 126 includes a valve seat 166, a valve ball 167, a spring 16
8 and the ball retainer 169, the thermal valve 12
9, and the manual valve 128 is also provided with a through hole 173.

When the hydraulic oil in the piston-side chamber 35A and the fifth piston-side chamber flow path 85 of the lifting / lowering cylinder device 17 expands in volume as the temperature rises, the expanded hydraulic oil causes the valve ball 167 to separate from the valve seat 166. Then, the thermal valve 126 is opened, flows through the through hole 173 and the first gap 171, reaches the first return flow path 130, and is discharged to the tank chamber 51.

Further, the screw portion 17 is
At 0, the screwed manual valve 125 is loosened, and this manual valve 125 is released (β direction in FIG. 10).
In this case, the spring urging force from the spring 168 does not act on the valve ball 167, and the communication passage 124 is in communication with the first return flow passage 130, so that the piston side chamber 35A of the lifting cylinder device 17 and the fifth piston The hydraulic oil in the side chamber flow path 85 is discharged to the tank chamber 51, and at the same time, the valve housing hole 17
The first gap 171 and the second gap 172 between the fourth valve 4 and the manual valve 125 are in communication with each other, the fifth rod-side chamber flow path 95 communicates with the first return flow path 130, and the rod-side chamber 35B and the Fifth rod side chamber flow path 9
5 is discharged into the tank chamber 51.

[L] Operation of Crane Apparatus (1) As shown in FIGS. 1 and 2, the procedure for transporting cargo 12 outside the marine vessel 11 to the deck 13 of the marine vessel 11 is as follows.

First, after the operator manually switches the flow path switching device 19 to the elevating position shown in FIGS. 4 and 5, the gear pump 48 of the pump device 16 is rotated in the reverse direction to cause the elevating cylinder device 17 to contract and operate the crane boom. 15 is lowered. In this state, the worker locks the load 12 on the hook 29 of the crane boom 15. Next, the pump device 1
6 by rotating the gear pump 48 in the normal direction to extend the lifting cylinder 17 and raise the crane boom 15 to move the load 12
Hoist.

Next, after the operator manually switches the flow path switching device 19 to the turning position, the gear pump 48 of the pump device 16 is rotated forward to extend the turning cylinder device 18 and the crane boom 15 is moved to the position shown in FIG. The baggage 1 locked by the hook 29 is turned by hydraulic pressure in the range indicated by the arrow A of FIG.
2 is horizontally moved above the deck 13 of the ship 11.

Next, the operator manually switches the flow path switching device 19 to the elevating position, inverts the gear pump 48 of the pump device 16 to contract the elevating cylinder device 17, lowers the crane boom 15, The luggage 12 locked by the 29 is suspended from the deck 13. In this state, the worker removes the load 12 from the hook 29.

Thereafter, the gear pump 48 of the pump device 16
To rotate forward to extend the lifting cylinder device 17,
The crane boom 15 is raised. Next, the operator manually switches the flow path switching device 19 to the turning position, reverses the gear pump 48 of the pump device 16 to contract the turning cylinder device 18, turns the crane boom 15, and moves the crane boom 15 out of the boat 11. Then, the next luggage 12 outside the ship 11 is transported by the crane device 10 in the above-described procedure.

(2) In order to unload the cargo 12 placed on the deck 13 of the ship 11, first, the crane boom 15 is lowered, and the
, The crane boom 15 is raised, and then the crane boom 15 is pivoted.
Is lowered, and the luggage 12 is removed from the hook 29.

(3) The procedure for manually turning the crane boom 15 in a state where the load 12 is locked on the hook 29 and in an empty state without locking the load 12 on the hook 29 is as follows. That is, by pulling the grip 69 and the grip bracket 70 of the locking mechanism 66 shown in FIG. 5, the locking pin 63 is disengaged from the engaging hole 65 of the column 20, and the column 20 and the elevating cylinder device via the ring member 62. 1
8 is released. In this state, column 20
Is rotatable around the turning axis 14A of the support 14, so that the operator can manually turn the crane boom 15 connected to the column 20 around the turning axis 14A.

(4) The swivel area of the crane boom 15 by the swivel cylinder device 18 is changed from the area A in FIG.
The procedure for changing to the area is as follows. That is,
Similarly to (3), the grip 69 and the grip bracket 70 of the locking mechanism 66 are pulled to release the locking pin 63 from one of the engagement holes 65 of the column 20. Next, in this state, after manually turning the crane boom 15, the locking pin 63 is locked in the other engaging hole 65 of the column 20.
Thereby, the swivel area of the crane boom 15 due to the expansion and contraction operation of the swivel cylinder device 18 is changed from the area A to the area B, for example.
Area can be changed.

[M] Effects of the Embodiment According to the crane apparatus 10 of the above embodiment, the following:
Has the effect of By the switching operation by the flow path switching device 19, the hydraulic oil from the pump device 16 is selectively supplied to the lifting cylinder device 17 for lifting and lowering the crane boom 15 and the turning cylinder device 18 for rotating the crane boom 15. ,
The crane boom 15 can be raised and lowered and turned by the hydraulic pressure of the hydraulic oil.

Further, since the hydraulic oil from the pump device 16 is selectively supplied to the lifting cylinder device 17 and the revolving cylinder device 18 by using the flow path switching device 19, the pump device 16 may be a single pump device. Since there is no need to separately install a dedicated hydraulic oil supply source for driving the cylinder device 17 and the swing cylinder device 18, the crane device 10 can be configured at low cost.

One end of a piston rod 55 of the revolving cylinder device 18 is fixed to a ring member 62, and the ring member 62 is rotatably loosely fitted to the column 20 of the column 14,
Locking pin 6 with which column 20 and ring member 62 are detachable
3 so that they can be integrally connected to each other.
By connecting the column 20 and the ring member 62 integrally by 3, the crane boom 15 can be swung by the action of hydraulic oil using the swivel cylinder device 18.
By releasing the locking pin 63 from at least one of the column 20 and the ring member 62, the
Can be freely rotated with respect to the ring member 62, so that the crane boom 15 and the column 20 can be manually turned.

The column 20 of the support 14 has a locking pin 6
Since a plurality of engaging holes 65 for engaging the two are formed in the circumferential direction, the turning area of the crane boom 15 by the turning cylinder device 18 is changed by engaging the locking pins 62 with different engaging holes 65. be able to. This engagement hole 65
By finely setting the hole positions, the change of the turning area can be set finely.

The up / down shuttle valve 89 and the swivel side shuttle valve 90 in the flow path switching device 19 are respectively installed between the switching valve 88 and the up / down cylinder device 17 and the swivel cylinder device 18, and the up / down shuttle valve 89 is moved up and down. The flow of the hydraulic oil flowing from the piston side chamber 35A and the rod side chamber 35B of the cylinder device 17 to the switching valve 88 can be prevented, and the turning shuttle valve 90 flows from the piston side chamber 56A and the rod side chamber 56B of the turning cylinder device 18 to the switching valve 88. Since the flow of hydraulic oil can be blocked, the lifting cylinder device 17
Communication between the piston-side chamber 35A and the rod-side chamber 35B, the communication between the piston-side chamber 56A and the rod-side chamber 56B of the revolving cylinder device 18, and the communication between the lifting cylinder device 17 and the revolving cylinder device 18. The state can be reliably shut off. Therefore, even if an external force acts on the lift cylinder device 17 and the swing cylinder device 18 that are switched by the fluid switching device 19 and are in the operation stopped state, the operations of the lift cylinder device 17 and the swing cylinder device 18 are reliably locked. As a result, the inadvertent expansion / contraction operation of the lifting / lowering cylinder device 17 and the revolving cylinder device 18 can be reliably prevented.

The fifth piston-side chamber flow path 85 and the fifth
The piston-side chamber 35A and the rod-side chamber 35B of the lifting / lowering cylinder device 17 can communicate with the rod-side chamber flow path 95.
A manual valve 125 with a built-in thermal valve 126 is installed, and a fifth piston side chamber flow path 97 and a fifth rod side chamber flow path 99 that connect the swivel side shuttle valve 90 and the swivel cylinder apparatus 18 are provided. A manual valve 12 with a built-in thermal valve 129 that enables communication between the piston side chamber 56A and the rod side chamber 56B.
8, the manual valve 1 can be operated even if the lift shuttle valve 89 and the swing shuttle valve 90 are arranged.
When the valves 25 and 128 are opened, the piston-side chamber 35A and the rod-side chamber 35B of the lifting / lowering cylinder device 17 communicate with each other, and the piston-side chamber 56
A can be communicated with the rod side chamber 56B, and the elevating cylinder device 17 and the revolving cylinder device 18 can be manually expanded and contracted.

The camshaft 135 constituting the switching valve 88 is
Since the first cam 141, the second cam 142, the third cam 143, and the fourth cam 144 are formed by the eccentric circle, these cams 141 to 144 can be easily processed as compared with a case of forming an ellipse, for example. Cost can be reduced.

[0114]

As described above, according to the flow path switching device of the present invention, each fluid chamber of the cylinder device to which the working fluid is not supplied is reliably sealed, and the operation of the cylinder device is reliably performed. Can be locked.

[Brief description of the drawings]

FIG. 1 is a side view showing a ship equipped with a crane device to which one embodiment of a flow path switching device according to the present invention is applied.

FIG. 2 is a plan view of the ship of FIG. 1;

FIG. 3 is a front view showing the crane device of FIG. 1;

FIG. 4 is an enlarged front view of a part of the crane device shown in FIG.

FIG. 5 is a sectional view taken along the line VV of FIG. 4;

FIG. 6 is a view on arrow VI in FIG. 4;

FIG. 7 is a sectional view taken along the line VII-VII of FIG. 4;

FIG. 8 is a circuit diagram showing a hydraulic circuit of the crane device of FIG.

FIG. 9 is a front sectional view showing the flow path switching device of FIG. 4 according to the present invention.

FIG. 10 is a sectional view taken along the line XX in FIG. 9;

FIG. 11 is a sectional view taken along the line XI-XI in FIG. 9;

FIG. 12 is a sectional view taken along the line XII-XII of FIG. 9;

FIG. 13 is a rear view showing the flow path switching device of FIG. 9;

FIG. 14 is a view on arrow XIV of FIG. 9;

FIG. 15 is a view taken in the direction of the arrow XV in FIG. 9;

FIG. 16 is a view taken in the direction of the arrow XVI in FIG. 11 in a state where a grip or the like is mounted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Crane apparatus 12 Luggage (suspended object) 14 Column 14A Revolving shaft 15 Crane boom 16 Pump device (fluid supply source) 17 Elevating cylinder device 18 Revolving cylinder device 19 Channel switching device 20 Column 21 Column base 24 Crane boom pivot Support shaft 29 Hook 35A Piston side chamber of elevating cylinder apparatus 35B Rod side chamber of elevating cylinder apparatus 55 Piston rod of revolving cylinder apparatus 56A Piston side chamber of revolving cylinder apparatus 56B Rod side chamber of revolving cylinder apparatus 61 Mounting bracket 62 Ring member (free-fitting member) 63 locking pin (locking member) 64 engaging hole (engaging portion) 65 engaging hole (engaging portion) 85 fifth piston side chamber flow passage 88 switching valve 89 elevating shuttle valve 90 swivel shuttle valve 95 fifth Rod side chamber flow path 97 Fifth piston side chamber flow path 99 Fifth rod side chamber flow path 100 Pump device port 101 Pump device port 105 Piston side chamber check valve 106 Rod side chamber check valve 111 Piston side chamber operation check valve 116 Rod side chamber operation check valve 125 Manual valve 128 Manual valve 136 First poppet valve 137 2nd poppet valve 138 3rd poppet valve 139 4th poppet valve 141 1st cam 142 2nd cam 143 3rd cam 144 4th cam

Claims (3)

[Claims] 1. A flow path switching device for selectively supplying a working fluid from a fluid supply source to a plurality of cylinder devices having two fluid chambers by switching a flow path. A switching valve that selectively communicates the discharge port and the discharge port with the two fluid chambers of the plurality of cylinder devices for each of the cylinder devices; and a switching valve disposed between the switching valve and the plurality of cylinder devices, respectively. The flow of the working oil from the two fluid chambers of the cylinder device to the switching valve can be prevented, and the flow of the working fluid from the switching valve to one of the fluid chambers of one cylinder device and the flow of the cylinder device And a plurality of shuttle valves that allow the flow of hydraulic oil from the other of the fluid chambers to the switching valve. 2. A manual valve which enables communication between both fluid chambers of each of said cylinder devices is provided in a flow path which communicates with each of said shuttle valves and each of said cylinder devices.
3. The flow path switching device according to claim 1. 3. The switching valve is openable and closable by a camshaft having a plurality of cams formed by eccentric circles and the respective cams, and is capable of communicating with respective fluid chambers of a plurality of cylinder devices. The flow path switching device according to claim 1, further comprising: a plurality of poppet valves; and the same number of the cams as the number of the fluid chambers of the plurality of cylinder devices.