JP2541174Y2 - Crusher rotation-free device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation-free device for a crusher attached to a tip of a work attachment of a construction machine for dismantling a building.

[0002]

2. Description of the Related Art FIG. 4 is a side view of a construction machine 2 for dismantling a building to which a crusher 1 is attached. In the figure, 3 is a work attachment, 4 is a boom of the work attachment 3, 5
Denotes an arm, and 6 denotes a building or the like for dismantling. FIG.
FIG. 5 is a partially cutaway detailed view of a portion A in FIG. 4. In the figure, 7 and 8 are a pair of open / close jaws of the crusher 1, 9 and 10 are crushing blades of the open / close jaws 7 and 8, respectively, 11 is a hydraulic cylinder, 12 is a rotary bearing, 13 is a hydraulic motor, and 14 is a work. It is a part to be attached to the tip of the attachment. FIG. 4 above
As shown in FIG. 5 and FIG.
Crushing blades 9 and 10 are fixed to the inner surfaces of the pair of opening and closing jaws 7 and 8 which are opened and closed along the longitudinal direction, respectively, and the crusher 1 is attached to the tip of the work attachment 3 by the hydraulic motor 13. Mounted rotatably.

FIG. 6 is a prior art hydraulic circuit diagram for operating the crusher 1. As shown in FIG. In the figure, reference numeral 15 denotes a pilot switching valve for controlling a hydraulic motor 13 for rotating the crusher 1;
Is a pilot switching valve for controlling the hydraulic cylinder 11 inside the crusher 1, 17 and 18 are hydraulic remote control valves for switching the hydraulic motor 13 and the hydraulic cylinder 11, respectively, and 19 and 20 are respectively for controlling various hydraulic actuators. Multiple valves 21 and 22 are first and second pumps respectively, 23 is a pilot pump, 24 and 25 are center bypass oil passages 26 and 2 of multiple valves 19 and 20 respectively.
Reference numeral 28 denotes an oil tank disposed downstream of the pilot valve 7. When the hydraulic remote control valve 17 is operated in the hydraulic circuit in FIG. 6, the pilot switching valve 15 is switched, so that the hydraulic motor 13 can be rotated forward or reverse. When the hydraulic remote control valve 18 is operated, the pilot switching valve 16 is switched, so that the hydraulic cylinder 11 can be extended or contracted. Thereby, the crushing and dismantling work by the crushing machine 1 can be performed.

[0004]

When a crushing and dismantling operation is performed by a construction machine for dismantling a building, the crushed object is often inclined with respect to the opening and closing direction of a crushing blade of the crushing machine. Therefore, when an object is gripped or crushed by the crusher, a torsional force acts on the work attachment due to the force generated by the hydraulic cylinder inside the crusher. As a result, cracks occurred in the arm, boom, etc. of the work attachment, causing early damage. An object of the present invention is to solve the above problems.

[0005]

According to the present invention, a hydraulic syringe is provided.
The inner surface of a pair of open / close jaws opened and closed by
Crushing blades are fixed along the direction to form a crusher,
The hydraulic cylinder is operated by a pilot switching valve for hydraulic cylinder.
Opening / closing control and work attachment of the crusher
Attached to the end of the element so that it can be rotated forward and backward by a hydraulic motor
The hydraulic motor has two hydraulic pumps for forward and reverse rotation of the crusher.
Pressure oil to the two hydraulic ports
With pilot switching valve for hydraulic motor to control supply and discharge of air
In the construction machine for dismantling a building, the two hydraulic ports
A hydraulic port communication oil passage communicating with the communication port, and the communication oil passage.
Shut-off / communication switching valve for shut-off / communication and the shut-off / communication disconnection
The shutoff / communication pilot pressure receiving part provided in the
Pyro installed in pilot switching valve for hydraulic cylinder
The pilot pressure receiving part and the shut-off / communication pilot pressure receiving part
A pressure receiving part communication oil passage is provided. Or
And a hydraulic port communication oil for communicating the two hydraulic ports.
Shutoff / communication switching valve for shutting off / communicating the oil passage and the communication oil passage
And a shutoff / communication pie provided on the shutoff / communication switching valve.
Lot pressure receiving part and directional switching valve for hydraulic cylinder
And the switching operation is performed in conjunction with the hydraulic cylinder direction switching valve.
And the shut-off / communication through the sub-valve.
Pilot pressure receiving section for pilot pressure and pilot cut for the hydraulic motor
Hydraulic remote control valve to derive pilot pressure to change valve
An oil passage communicating with the pressure receiving portion is provided. And
In the present invention, the pressure receiving part communication oil passage may be connected to the pressure receiving part communication oil passage.
An opening and closing to open and shut off the oil passage was provided.

[0006]

FIG. 1 shows a rotation-free device 3 according to a first embodiment of the present invention.
FIG. 3 is a hydraulic circuit diagram showing a third embodiment. In the figure, the same reference numerals are given to components using the same components as the conventional technology. 2
Reference numerals 9 and 30 denote hydraulic oil supply / discharge conduits of the hydraulic motor 13, 31 a shutoff / communication switching valve, 32 a pilot pressure receiving portion of the shutoff / communication switching valve 31, 34 a load-side oil chamber of the hydraulic cylinder 11, C is a load pressure supply oil passage position of the pilot switching valve 16, D is a crusher opening oil passage position, 35 is a load pressure supply oil passage position side pilot pressure receiving portion, and 36 is a crusher opening oil passage position side pilot pressure receiving portion. , 37 and 37 'are pilot lines.

Next, the rotation free device 3 according to the first aspect of the present invention.
3 will be described with reference to FIG. Embodiment of the present invention
The lee device 33 is opened and closed by the hydraulic cylinder 11.
A pair of open / close jaws (not shown in FIG. 1 but shown in FIG. 5)
On the inner surface of the jaws 7, 8)
A crushing machine is formed by fixing crushing blades facing each other along
The pressure cylinder 11 is a pilot switching valve 16 for a hydraulic cylinder.
The crusher is controlled by the work
(Not shown in FIG. 1, but shown in FIG. 4)
Hydraulic motor at the tip of the attachment 3)
13 so that the hydraulic motor 13
Are two hydraulic ports for forward and reverse rotation of the crusher (for hydraulic oil supply and discharge)
Hydraulic ports connecting pipe lines 29 and 30)
Supply and discharge pressure oil to and from the two hydraulic ports.
It has a pilot switching valve 15 for the hydraulic motor to be controlled.
In the construction machine for dismantling a building, the two hydraulic ports
And a hydraulic port communication oil passage that communicates with
Shut-off / communication switching valve 31 for shut-off / communication, and the shut-off / communication
Shut-off / communication pilot pressure receiving part provided in switching valve 31
(Pilot pressure receiving portion 32) and the hydraulic cylinder
Pilot pressure receiving part 3 provided in pilot switching valve 16
5, 36 and the shut-off / communication pilot pressure receiving section
Pressure receiving part communication oil passage (pilot lines 37, 37 '
). That is, the rotation free device 33
Then, the hydraulic motor 13 for rotating the crusher and the hydraulic motor 1
3 and a pilot switching valve 15 for controlling
Between the pressure oil supply / discharge lines 29 and 30
And the shut-off / communication switching valve 31
And the load pressure of the pilot switching valve 16.
Pilot the supply oil passage position side pilot pressure
The pipes 37 and 37 'communicated.

Next, the rotation free device 3 according to the first aspect of the present invention.
The operation of No. 3 will be described. When the pilot pressure does not act on the load pressure supply oil passage position side pilot pressure receiving portion 35 of the pilot switching valve 16, that is, when the pilot switching valve 16 is not switched to the load pressure supply oil passage position c, the crusher performs the crushing operation. I haven't. In this case, since the shut-off / communication switching valve 31 remains at the shut-off oil passage position A, the crusher does not enter a rotation-free state.

Next, when the pilot valve 39 of the hydraulic remote control valve 18 is operated (operated in the direction of the arrow) to open the crusher, the pilot pressure from the pilot pump 23 is applied to the pipelines 40 and 41 and the pilot valve. 39, pipeline 42, 4
Via 3, it acts on the pilot pressure receiving portion 36. The pilot switching valve 16 is switched to the crusher opening oil passage position d, and the hydraulic cylinder 11 is contracted to open the crusher. Then, the crushing blade opened by the opening is positioned with respect to the crushed object. In this state, the pilot valve 38 of the hydraulic remote control valve 18 is operated (operated in the direction of arrow E). The pilot pressure from the pilot pump 23 is supplied to the lines 40 and 41, the pilot valve 38, the lines 44 and
5, one of which acts on the pilot pressure receiving portion 35 via the pipe line 37 '. The other side branches at a pipe 45 and acts on the pilot pressure receiving portion 32 via a pipe 37. Then, the pilot switching valve 16 is switched to the load pressure supply oil passage position C, and pressurized oil is supplied to the load-side oil chamber 34 of the hydraulic cylinder 11, so that the crusher starts the crushing operation. At the same time, the shutoff / communication switching valve 31 switches from the shutoff oil passage position A to the communication oil passage position B. Thereby, when the crusher is performing the crushing operation, the hydraulic motor 13 is in a rotation free state, and no torsional force acts on the work attachment such as the boom and the arm. That is, since an excessive load is not applied to the work attachment, crack generation is prevented and durability is improved.

FIG. 2 is a hydraulic circuit diagram showing a rotation free device 46 according to a second aspect of the present invention. In the figure, components using the same components as those of the rotation free device 33 of claim 1 are denoted by the same reference numerals. Reference numeral 47 denotes a direction switching valve for controlling the hydraulic cylinder 11, and reference numeral 48 denotes a sub-valve linked with the direction switching valve 47. Next, the configuration of the rotation free device 46 is shown in FIG.
Is described. In the embodiment of the present invention, the rotation free device 46 is used.
Are two hydraulic ports of the hydraulic motor 13 (pressure oil supply / discharge pipe
Hydraulic ports connecting the passages 29 and 30).
And the hydraulic port communication oil passage through which the
Cut-off / communication switching valve 31 for passing through, and the shut-off / communication switching valve
The shutoff / communication pilot pressure receiving part (pi
Lot pressure receiving part 32) and directional control valve 4 for hydraulic cylinder
7 and interlocked with the hydraulic cylinder direction switching valve 47
A sub-valve 48 for switching operation by
8 through the shut-off / communication pilot pressure receiving portion (pyro
Pressure receiving unit 32) and the pilot switching for the hydraulic motor.
Hydraulic remote control valve 1 for deriving pilot pressure to valve 15
7 and the pressure receiving part communicating oil passage (pilot line 50,
52). That is, the rotation free device 4
6, the hydraulic motor 13 for rotating the crusher and its hydraulic motor
13 and the pilot switching valve 15 that controls
Between the pressure oil supply / discharge lines 29 and 30
1 and the directional control valve 47 for the hydraulic cylinder.
Through a sub-valve 48 that switches in conjunction with
The pilot pressure receiving portion 32 of the shutoff / communication switching valve 31
The hydraulic remote control valve 17 for operating the pressure motor 13
The pipes 50 and 52 communicated with each other.

Next, the rotation free device 4 according to the second aspect of the present invention.
The operation of No. 6 will be described. When the directional control valve 47 is in the neutral position or the D 'position, the crusher is not crushing. In this case, the pilot pressure from the pilot pump 23 as the pilot pressure hydraulic pressure source is shut off at the shutoff oil passage position of the sub-valve 48. Since the shut-off / communication switching valve 31 remains at the shut-off oil passage position A, the crusher does not enter a rotation-free state, so that the crushed object can be reliably approached to a position where the crushed object is grasped.

Next, when the object to be crushed is crushed by the open crusher, the direction switching valve 47 is operated to the position C '.
Since the sub-valve 48 is switched to the open oil passage position in conjunction therewith, the pilot pressure from the pilot pump 23 is applied to the pipelines 51 and 52, the open oil passage position of the sub-valve 48, and the pipeline 50.
, And acts on the pilot pressure receiving portion 32. The shutoff / communication switching valve 31 switches from the shutoff oil passage position A to the communication oil passage position B. Thereby, when the crusher is performing the crushing operation, the hydraulic motor 13 enters the rotation free state. Therefore, the function of the rotation free device 46 of the second aspect is the same as that of the first aspect.
This is the same as the case of the rotation free device 33.

FIG. 3 is a hydraulic circuit diagram showing a rotation free device 53 according to a third aspect of the present invention. In the figure, components using the same components as those of the rotation free device 33 of claim 1 are denoted by the same reference numerals. Next, the configuration of the rotation free device 53 will be described with reference to FIG. Pilot line 3 connected to pilot pressure receiving portion 32 of shutoff / communication switching valve 31
An on-off valve 54 is provided at 7a-37b, and the on-off valve 54 is operated as required, thereby selecting whether to execute or not to execute the rotation-free state of the crusher.

Next, the rotation free device 5 according to the third aspect of the present invention.
The operation of No. 3 will be described. When the construction machine for dismantling a building performs a crushing operation, there is a case where the crusher does not want to be in a rotation-free state depending on an operation condition. In this case, the on-off valve 54 is switched to the shutoff oil passage position. Then, even if the pilot switching valve 16 is operated to the load pressure supply oil passage position C, the pilot pressure does not act on the pilot pressure receiving portion 32. Therefore, since the shutoff / communication switching valve 31 remains at the shutoff oil passage position A, the crusher does not enter the rotation-free state. However, when the crushing operation is performed by switching the on-off valve 54 to the open oil passage position, the crusher can exhibit a rotation-free state. The open / close valve 54 is not limited to the manual switching type, but may be an electromagnetic type or a pilot type. Further, the on-off valve 54 can also be used by being interposed in the pipeline 50 in the rotation free device 46 of the second aspect.

[0015]

As described above, in the present invention, when the pilot switching valve (including the case of a direct push-pull type directional switching valve) for controlling the hydraulic cylinder for the crusher is switched to the load pressure supply oil passage position, The shutoff / communication switching valve switches from the shutoff oil passage position to the communication oil passage position by the action of the pilot pressure.
Thereby, when the crusher is performing the crushing operation, the hydraulic motor is in a rotation free state, and no torsional force acts on the work attachment such as the boom and the arm. That is, since an unreasonable load is not applied to the work attachment, crack generation is prevented and durability is improved. In addition, an on-off valve is interposed in the pilot line connected to the pilot pressure receiving part of the shut-off / communication switching valve, so that the on-off valve can be operated as required during crushing work to make the rotation of the crusher free. It is convenient because it can be implemented.

[Brief description of the drawings]

FIG. 1 is a hydraulic circuit diagram showing a rotation free device according to a first embodiment of the present invention.

FIG. 2 is a hydraulic circuit diagram showing a rotation free device according to a second aspect of the present invention.

FIG. 3 is a hydraulic circuit diagram showing a rotation free device according to a third aspect of the present invention.

FIG. 4 is a side view of a construction machine for dismantling a building to which a crusher is attached.

FIG. 5 is a partially cutaway detailed view of a portion A in FIG. 3;

FIG. 6 is a prior art hydraulic circuit diagram for operating a crusher.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Crusher 3 Work attachment 11 Hydraulic cylinder 13 Hydraulic motor 15, 16 Pilot switching valve 23 Pilot pump 31 Shut-off / communication switching valve 32, 35, 36 Pilot pressure receiving part 33, 46, 53 Rotation free device 34 Load side oil chamber 47 Direction switching valve 48 Sub-valve 54 On-off valve

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-55-126620 (JP, A) JP-A 1-65903 (JP, U) JP-A 56-20834 (JP, U) JP-A 55-126834 65147 (JP, U) Jiko 60-16188 (JP, Y2)

Claims (3)

(57) [Scope of request for utility model registration] 1. A crusher is formed by fixing crushing blades on the inner surfaces of a pair of openable and closable jaws opened and closed by a hydraulic cylinder along the longitudinal direction thereof, wherein the hydraulic cylinder is a hydraulic cylinder.
Open / close control by the pilot switching valve for
Hydraulic motor at the tip of the work attachment
The hydraulic motor is crusher
With two hydraulic ports for forward and reverse rotation of
Hydraulic motor that controls the supply and discharge of pressure oil to and from the two hydraulic ports
A hydraulic port communicating the two hydraulic ports in a construction demolition construction machine having a pilot switching valve
Communication oil passage, and interruption / communication for interrupting / communicating the communication oil passage
A switching valve, and a shutoff / communication provided in the shutoff / communication switching valve.
And a pilot pressure receiving portion for the hydraulic cylinder and a pilot for the hydraulic cylinder.
The pilot pressure receiving part provided in the switching valve
There is a pressure receiving part communication oil passage that communicates with the communication pilot pressure receiving pressure part.
A rotation-free device for a crusher. 2. A crusher is formed by opposing and fixing crushing blades on the inner surfaces of a pair of opening and closing jaws opened and closed by a hydraulic cylinder along the longitudinal direction thereof, wherein the hydraulic cylinder is a hydraulic cylinder.
Open / close control by the directional control valve for
The crusher is attached to the tip of the work attachment by a hydraulic motor.
The hydraulic motor is mounted so that it can rotate in the forward and reverse directions.
It has two hydraulic ports for rotation and the two
For hydraulic motor that controls the supply and discharge of hydraulic oil to hydraulic port of
In a construction demolition construction machine having an illot switching valve, a hydraulic port communication for communicating the two hydraulic ports is provided.
Shut-off / communication switching to shut off / communicate the oil passage and the communication oil passage
A valve and a shutoff / communication valve provided on the shutoff / communication switching valve.
In the pilot pressure receiving part and the directional switching valve for the hydraulic cylinder
Switched in conjunction with the hydraulic cylinder direction switching valve provided
An actuated sub-valve; and
Disconnection / communication pilot pressure receiving part and the pyromotor for the hydraulic motor
Hydraulic remote control to derive pilot pressure to cut-off valve
A rotation-free device for a crusher, comprising a pressure-receiving part communication oil passage communicating with a valve . 3. The pressure receiving part communication oil passage communicates with the pressure receiving part communication oil passage.
An on-off valve that opens and closes the oil passage is provided.
3. A rotation-free device for a crusher according to claim 1 or 2 .