JP2007290791A - Hydraulic circuit system of crane - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic circuit system of a crane capable of improving working efficiency in disassembling and assembling work of the crane. <P>SOLUTION: This hydraulic circuit system of the crane is constituted to control hydraulic pressure supplied to a hydraulic cylinder 17 for working by a control valve 41 by changing oil passages 81, 61 between the control valve 41 and a motor 33 for a jib derricking drum over to each other. Consequently, it is possible to expand and contract a rod 17a of the hydraulic cylinder 17 for working and to minutely control expanding speed and contracting speed of the rod 17a. Accordingly, it is possible to improve the disassembling/assembling work of the tower crane 100 using the hydraulic cylinder 17 for working. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hydraulic circuit system for a crane that supplies pressure oil to a working hydraulic cylinder used for crane disassembling and assembling work.

  When changing the lifting capacity or boom length of the crane, or when disassembling or assembling the crane for transportation, a counterweight mounted on the rear part of the fuselage is attached and detached. A crane is known in which a hydraulic cylinder for working for lifting the counterweight is provided on the mast member of the crane when the counterweight is attached and detached (see Patent Document 1).

JP-A-10-330084

  However, in conventional cranes, the pressure oil supplied to the working hydraulic cylinder is controlled by an electromagnetic switching valve, so the lifting speed of the counterweight suspended by the working hydraulic cylinder cannot be finely controlled, and work efficiency is reduced. It was bad.

(1) A crane hydraulic circuit system according to a first aspect of the present invention includes a hydraulic power source, a winch hydraulic motor driven by oil discharged from the hydraulic power source, and a crane disassembled assembly driven by oil discharged from the hydraulic power source. A working hydraulic cylinder used in the work, a first circuit for connecting the hydraulic power source and the winch hydraulic motor, and a coupling means for selectively switching the second circuit for connecting the hydraulic power source and the working hydraulic cylinder; And a control valve for controlling the flow of discharged oil from the hydraulic power source based on the operation of the operating means.
(2) The invention of claim 2 is the crane hydraulic circuit system according to claim 1, wherein the winch hydraulic motor is provided on a boom of the crane.
(3) A third aspect of the present invention is the crane hydraulic circuit system according to the second aspect, wherein the joint means is provided in the vicinity of a support portion that is provided on the crane body frame and supports the boom in a undulating manner. It is characterized by.

  According to the present invention, the first circuit for connecting the hydraulic power source and the hydraulic motor for winch and the second circuit for connecting the hydraulic power source and the working hydraulic cylinder are selectively switched, And a control valve for controlling the flow of the discharged oil from the hydraulic power source based on the operation. Thereby, since the operation speed of the working hydraulic cylinder can be finely controlled by the control valve, the working efficiency at the time of the crane disassembling and assembling work can be improved.

  An embodiment of a hydraulic circuit for a crane according to the present invention will be described with reference to FIGS. FIG. 1 is a view of a tower crane provided with a hydraulic circuit according to the present invention as viewed from the left side surface. The tower crane 100 includes a traveling body 1, a revolving body 2 that is turnably mounted on the traveling body, a boom 3 that is pivotally supported on the tip of the revolving body 2, and a tip of the boom 3. And a jib 4 pivotally supported.

  The traveling body 1 includes a substantially H-shaped track frame (not shown) and a side frame 1a. In the revolving structure 2, a front drum 10, a rear drum 11, and a boom hoisting drum 12 are mounted on a body frame (main frame) 2a. In addition, a detachable counterweight 14 is mounted on the rear part of the swing body 2. A front wire rope 10a (hereinafter referred to as a front rope) is wound around the front drum 10, and the front rope 10a is connected to the boom hook 6 via a boom top. When the front drum 10 is driven, the front rope 10a is wound or unwound and the boom hook 6 is moved up and down. A rear wire rope 11a (hereinafter referred to as a rear rope) is wound around the rear drum 11, and the rear rope 11a is connected to the jib hook 5 via a boom top and a jib tip. As the rear drum 11 is driven, the rear rope 11a is wound or unwound and the jib hook 5 is raised and lowered.

  A mast 7 is pivotally supported at the front portion of the revolving body 2 so as to be able to turn in the front-rear direction through the revolving body 2, and the tip of the mast 7 and the top of the boom 3 are connected by a pendant rope 15. . A boom hoisting rope 12 a is wound around the boom hoisting drum 12, and the boom hoisting rope 12 a is hooked a plurality of times between a sheave 21 provided behind the boom hoisting drum 12 and a sheave 22 provided at the tip of the mast 7. It has been turned. By driving the boom hoisting drum 12, the boom hoisting rope 12 a is wound or fed out, whereby the mast 7 is rotated in the front-rear direction, and the boom 3 is hoisted via the pendant rope 15.

  A jib hoisting drum 13 is provided in the vicinity of the base end of the boom 3 and on the back side, and a jib hoisting rope 13a is wound around the jib hoisting drum 13. A front post 8 is integrally attached to the base end of the jib 4, and the front post tip and the jib tip are connected by a pendant rope 16. The rear post 9 is integrally attached to the top of the boom 3, and the jib hoisting rope 13 a is looped a plurality of times between sheaves 23 and 24 provided at the tips of the posts 8 and 9. By driving the jib hoisting drum 13, the jib hoisting rope 13 a is wound or unwound, whereby the front post 8 rotates in the front-rear direction with respect to the rear post 9, and the jib 4 rises and lowers via the pendant rope 16.

  A working hydraulic cylinder 17 is provided near the tip of the mast 7. As will be described later, the working hydraulic cylinder 17 is used when the tower crane 100 is disassembled for transportation, and when the disassembled tower crane 100 is assembled after transportation, the counterweight 14 and the side frame 1a of the traveling body 1 are assembled. It is used for attaching / detaching work.

-Disassembly and assembly of tower crane 100 ---
Since the tower crane 100 is limited in size and weight when transported by a trailer or the like, it is necessary to disassemble and transport the tower crane 100. Also, after being disassembled and transported, it must be reassembled. In order to disassemble the tower crane 100 into a state suitable for transportation, first, the jib 4 is rotated downward so as to be substantially parallel to the boom 3. Next, the boom 3 is rotated forward to land on the ground. The jib hook 5 is removed from the rear rope 11a, the boom hook 6 is removed from the front rope 10a, and the front rope 10a, rear rope 11a, jib hoisting rope 13a, and pendant ropes 15 and 16 are removed from each sheave. The jib 4 and the boom 3 are disassembled, respectively, and the connection between the boom 3 and the swing body 2 is released.

  Next, the counterweight 14 is removed from the revolving unit 2, and the revolving unit 2 is jacked up by a jackup device (not shown), and then the side frame 1 a and the lower weight (not shown) are removed from the track frame of the traveling unit 1. By disassembling the tower crane 100 in this way, each component can be transported by a trailer or the like. After transportation, the tower crane 100 may be assembled by a procedure reverse to the disassembling procedure described above.

  As described above, the tower crane 100 of the present embodiment is provided with the working hydraulic cylinder 17 that is used when the counterweight 14 and the side frame 1a are attached and detached. FIG. 2 is a right side view of the tower crane 100 with the jib 4, boom 3 and counterweight 14 removed. The working hydraulic cylinder 17 has a bottom side attached to the tip of the mast 7 so as to be rotatable. As shown in FIG. 2, when the tip of the mast 7 is rotated forward from the center of rotation of the mast 7 with respect to the revolving structure 2, the working hydraulic cylinder 17 has its own weight so that the tip of the rod 17 a faces vertically downward. It is rotated as follows. Further, as shown in FIG. 1, when the tip of the mast 7 is rotated rearward from the center of rotation of the mast 7 with respect to the revolving structure 2, the working hydraulic cylinder 17 is substantially parallel to the mast 7. It is rotated.

  A hook 18 is attached to the tip of the rod 17a of the working hydraulic cylinder 17, and the load suspended by the hook 18 is raised and lowered by extending or retracting the rod 17a. Further, by driving the boom hoisting drum 12, the mast 7 can be rotated in the front-rear direction, and the load suspended by the working hydraulic cylinder 17 can be moved back and forth in the revolving structure 2. FIG. 2 shows a state where the transported counterweights 14 are unloaded from the trailer and stacked.

  FIG. 3 is a diagram illustrating a hydraulic circuit of the tower crane 100. The hydraulic circuit includes a hydraulic pump 31, traveling motors 32a and 32b, a jib hoisting drum motor 33, a working hydraulic cylinder 17, a rear drum motor 34, a boom hoisting drum motor 35, and a front drum. A motor 37 is provided. The hydraulic circuit is provided with a control valve 41 and a remote control valve 45 for controlling the pressure oil to the jib hoisting drum motor 33. In the hydraulic circuit shown in FIG. 3, descriptions of the pilot pump and the operation means other than the remote control valve 45 are omitted.

  The hydraulic pump 31 is a hydraulic source that supplies discharged oil (pressure oil) to each actuator of the tower crane 100 and is driven by an engine (not shown). The control valve 41 is a valve that controls the flow of pressure oil supplied from the hydraulic pump 31 to the jib hoisting drum motor 33. The control valve 41 and the jib hoisting drum motor 33 are connected by oil passages 81 and 63. The oil passage 81 and the oil passage 63 are connected via a pipe joint 70.

  The pipe joint 70 is a hydraulic pipe joint composed of a pair of connection end portions 71 and 72 that can be attached to and detached from each other. The connection end portions 71 and 72 are each provided with a check valve. When the connection end portion 71 and the connection end portion 72 are separated, the oil passage 63 connected to the connection end portions 71 and 72 is provided. , 81 are closed, and the flow of pressure oil (hydraulic oil) is prohibited. When the connection end portion 71 and the connection end portion 72 are connected, the oil passage 63 and the oil passage 81 connected to the connection end portions 71 and 72 are communicated to permit the flow of pressure oil.

  The remote control valve 45 is a valve that controls pilot pressure oil for driving the spool of the control valve 41, has an operation lever 45 a that is an operation means, and is provided in the cab of the tower crane 100. When the operation lever 45a is operated, pilot pressure oil having a pressure corresponding to the operation amount of the operation lever 45a is supplied to the control valve 41, and the spool of the control valve 41 is driven from the neutral position. As a result, the pressure oil supplied from the hydraulic pump 31 is supplied from the control valve 41 to the jib hoisting drum motor 33 through the oil passages 81 and 63 and the pipe joint 70 in an amount corresponding to the operation amount of the operation lever 45a. Is done.

  As described above, the boom 3 is removed from the revolving structure 2 during transportation of the tower crane 100, but the jib undulation drum 13 provided on the boom 3 is also removed together with the boom 3. At that time, the oil passages 81 and 63 connecting the control valve 41 and the jib hoisting drum motor 33 are separated from each other by separating the connection end 71 and the connection end 72 of the pipe joint 70. That is, when the tower crane 100 is disassembled and assembled, the jib hoisting drum motor 33 is not connected to the control valve 41 while the boom 3 is detached from the revolving structure 2.

  Therefore, in the tower crane 100 of the present embodiment, the working hydraulic cylinder 17 used when disassembling and assembling the tower crane 100 is connected to the control valve 41, so that the pressure oil supplied to the working hydraulic cylinder 17 is controlled by the control valve. 41 is controlled. That is, as shown in FIG. 4, the connection end 71 of the pipe joint 70 is attached to the end of the oil passage 61 connected to the working hydraulic cylinder 17, and the connection end 71 is connected to the end of the oil passage 81. Connect to the attached connection end 72. Thereby, the rod 17a of the working hydraulic cylinder 17 can be extended and retracted at a speed corresponding to the operation amount of the operation lever 45a. 3 and 4, 46 is a counter balance valve, which prevents the load suspended by the working hydraulic cylinder 17 from dropping suddenly.

  FIG. 5 is a diagram showing details of the main frame 2 a and the mast 7 of the revolving structure 2 in the transportation state of the tower crane 100. It is a perspective view when it sees from. In FIG. 5, the mast 7 is rotated toward the rear of the tower crane 100 and is substantially parallel to the main frame 2 a. In FIG. 5, the description of the sheave 22 and the like is omitted. Reference numeral 2b denotes a boom support part that pivotally supports the boom 3, and reference numeral 2c denotes a mast support part that supports the mast 7 so as to be rotatable. Reference numeral 7a denotes a tip portion of the mast 7, and 7b denotes a rotation center of the mast 7 pivotally supported by the mast support portion 2c.

  Reference numeral 19 denotes a hydraulic cylinder for erecting the mast 7 that is rotated toward the rear of the tower crane 100, and one hydraulic cylinder is attached to each side of the main frame 2 a. The mast 7 is raised toward the front of the tower crane 100 by extending the rod of the cylinder 19. After the mast 7 is erected and the distal end portion 7a is rotated forward from the mast support portion 2c, the boom hoisting rope 12a is wound up or fed out by driving the boom hoisting drum 12, so that the mast due to its own weight. The mast 7 can be rotated in the front-rear direction while restricting the forward rotation of the main frame 2a.

  The control valve 41 is provided near the right side surface of the main frame 2a, and the oil passage 81 extends along the right side surface of the main frame 2a. A connection end 72 attached to the end of the oil passage 81 is fixed to a bracket 2d provided in the vicinity of the boom support 2b on the right side of the main frame 2a.

  An oil passage 61 connected to the working hydraulic cylinder 17 is a flexible hydraulic hose and is disposed along the mast 7 from the vicinity of the tip 7a of the mast 7 toward the rotation center 7b. The connection end 71 attached to the end of the oil passage 61 can be connected to the connection end 72 fixed to the bracket 2d. That is, as shown in FIG. 4, the working hydraulic cylinder 17 and the control valve 41 can be connected via the oil passages 81 and 61 and the pipe joint 70. Therefore, the rod 17a of the working hydraulic cylinder 17 can be extended and retracted by operating the operation lever 45a after the mast 7 is rotated toward the front of the tower crane 100 as shown in FIG.

  6 is a perspective view of the vicinity of the boom support portion 2b to which the boom 3 is attached as viewed from the front right side of the tower crane 100. FIG. The oil passage 63 connected to the jib hoisting drum motor 33 is a flexible hydraulic hose. 75 is a cylinder hose storage bracket provided in the vicinity of the bracket 2d, that is, in the vicinity of the boom support portion 2b on the right side of the main frame 2a.

  When the boom 3 is attached to the revolving structure 2, the connection end 71 attached to the end of the oil passage 61 is separated from the connection end 72 fixed to the bracket 2d. As described above, since the connection end portions 71 and 72 are provided with check valves, the hydraulic oil in the oil passages 61 and 81 does not leak even if the connection end portion 71 and the connection end portion 72 are separated. . The separated connection end 71 can be fixed by being attached to the cylinder hose storage bracket 75. In FIG. 6, illustration of the oil passage 61 and the connection end portion 71 connected to the end portion of the oil passage 61 is omitted.

  The boom 3 is attached to the boom support portion 2b, and the connection end portion 71 attached to the end portion of the oil passage 63 is connected to the connection end portion 72 fixed to the bracket 2d. As a result, as shown in FIG. 3, the jib hoisting drum motor 33 and the control valve 41 are connected via the oil passages 81 and 63 and the pipe joint 70. Therefore, the jib hoisting drum motor 33 can be driven by operating the operation lever 45a.

In the tower crane 100 of embodiment mentioned above, there exists the following effect.
(1) The control valve 41 controls the pressure oil supplied to the working hydraulic cylinder 17 by switching the oil passages 81 and 61 between the control valve 41 and the jib hoisting drum motor 33. Thereby, the rod 17a of the working hydraulic cylinder 17 can be extended and retracted at a speed corresponding to the operation amount of the operation lever 45a, so that the extension speed and the contraction speed of the rod 17a can be finely controlled. Therefore, in disassembling / assembling work of the tower crane 100 using the working hydraulic cylinder 17, it is easy to align the load suspended by the working hydraulic cylinder 17, so that work efficiency can be improved.

(2) The control valve 41 that controls the jib hoisting drum motor 33 attached to the boom 3 is configured to control the pressure oil supplied to the working hydraulic cylinder 17 with the control valve 41. Thereby, since the oil path separated when the tower crane 100 is disassembled and assembled can be used, the operation for switching the oil path can be minimized, which is efficient.

(3) The pipe joint 70 is arranged in the vicinity of the boom support portion 2b. As a result, the length of the oil passage 63 connected to the jib hoisting drum motor 33 and the oil passage 61 connected to the working hydraulic cylinder 17 can be reduced to the minimum necessary length. Installation is easy and cost increase can be suppressed.

(4) The pipe joint 70 is used to switch the oil passage. Thereby, the oil path can be easily switched, and the working efficiency is improved. Further, since the connection end portions 71 and 72 are provided with check valves, the working oil does not leak when the connection end portions 71 and 72 are separated, and the working environment can be improved.

(5) Since the separated connection end 71 can be fixed by being attached to the cylinder hose storage bracket 75, the end of the oil passage 61 does not move around during the crane operation. As a result, damage to the oil passage 61 can be prevented and the appearance can be improved.

---- Modified example ---
(1) In the above description, the working hydraulic cylinder 17 is controlled by the control valve 41 that controls the jib hoisting drum motor 33, but the present invention is not limited to this. For example, the working hydraulic cylinder 17 may be controlled by a control valve that controls the rear drum motor 34 and the front drum motor 37 that are not driven when the tower crane 100 is disassembled and assembled.

  In order to control the working hydraulic cylinder 17 with a control valve that controls the rear drum motor 34 or the front drum motor 37, an oil path between the rear drum motor 34 or the front drum motor 37 and the control valve is provided. It is necessary to disconnect once. On the other hand, in the above-described embodiment, the working hydraulic cylinder 17 is connected to an oil passage connecting the jib hoisting drum motor 33 and the control valve 41 that is surely separated when the tower crane 100 is transported. . Therefore, it is not necessary to separate the oil path between the rear drum motor 34 or the front drum motor 37 and the control valve. From the viewpoint of work efficiency required for switching the oil passage, it is desirable to control the working hydraulic cylinder 17 with the control valve 41 as in the above-described embodiment.

  In addition, in order to control the working hydraulic cylinder 17 with the control valve that controls the rear drum motor 34 and the front drum motor 37, the oil is supplied to the vicinity of the portion where the rear drum motor 34 and the front drum motor 37 are provided. It is necessary to extend the path 61. As shown in FIGS. 1 and 2, the rear drum motor 34 and the front drum motor 37 are provided at positions separated rearward from the tip of the revolving unit 2, so that the rotation center 7 b (mast support) of the mast 7 is provided. If the oil passage 61 is extended to the vicinity of the rear drum motor 34 and the front drum motor 37 via the vicinity of the part 2c), the length of the oil passage 61 becomes longer than that in the above-described embodiment. .

  On the other hand, in the above-described embodiment, the oil passage 61 may be extended to the vicinity of the connection end 72 fixed to the bracket 2d in the vicinity of the boom support portion 2b. Can be shortened. Thereby, arrangement | positioning of the oil path 61 becomes easy and it can suppress an increase in cost.

(2) In the above description, the working hydraulic cylinder 17 is provided on the mast 7, but the working hydraulic cylinder 17 may be provided on the boom 3. Even when the working hydraulic cylinder 17 is provided on the boom 3, as described above, the working path is switched by switching the oil passages 81 and 61 between the control valve 41 and the jib hoisting drum motor 33. The pressure oil supplied to the hydraulic cylinder 17 can be controlled by the control valve 41.
(3) You may combine each embodiment and the modification which were mentioned above, respectively.

  In the above embodiment and its modifications, for example, the hydraulic source corresponds to the hydraulic pump 31, the winch hydraulic motor corresponds to the jib hoisting drum motor 33, and the joint means corresponds to the pipe joint 70. The above description is merely an example, and when interpreting the invention, there is no limitation or restriction on the correspondence between the items described in the above embodiment and the items described in the claims.

It is the figure which looked at the tower crane provided with the hydraulic circuit by this invention from the left side surface. It is a right side view of the tower crane 100 with the jib 4, the boom 3 and the counterweight 14 removed. 1 is a diagram showing a hydraulic circuit of a tower crane 100. FIG. 1 is a diagram showing a hydraulic circuit of a tower crane 100. FIG. It is a figure which shows the detail of the main frame 2a and the mast 7 of the turning body 2 in the transport state of the tower crane 100. FIG. 2 is a perspective view of the vicinity of a boom support portion 2b to which a boom 3 is attached as viewed from the front right side of a tower crane 100. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Traveling body 2 Revolving body 3 Boom 7 Mast 13 Jib hoisting drum 17 Working hydraulic cylinder 14 Counterweight 31 Hydraulic pump 33 Jib hoisting drum motor 41 Control valve 45 Remote control valve 61, 63, 81 Oil passage 70 Pipe joint 71, 72 Connection end 100 Tower crane

Claims (3)

A hydraulic source;
A winch hydraulic motor driven by oil discharged from the hydraulic source;
A hydraulic cylinder for operation that is driven by oil discharged from the hydraulic source and is used in the work of disassembling and assembling the crane;
A coupling means for selectively switching between a first circuit connecting the hydraulic source and the hydraulic motor for winch and a second circuit connecting the hydraulic source and the working hydraulic cylinder;
A crane hydraulic circuit system comprising: a control valve that controls a flow of discharged oil from the hydraulic source based on an operation of an operating means. In the hydraulic circuit system of the crane according to claim 1,
The crane hydraulic circuit system, wherein the winch hydraulic motor is provided on a crane boom. In the hydraulic circuit system of the crane according to claim 2,
The crane hydraulic circuit system, wherein the joint means is provided in the vicinity of a support portion that is provided on a body frame of the crane and supports the boom so as to be raised and lowered.

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