JP3922511B2 - Swivel work machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention, through a swivel device on the traveling body set up turning body, relates to the work front and the cab becomes attached to the swivel body slewing type working machine, in particular load of loading and unloading of the ship The present invention relates to a swivel working machine having a ladder for getting on and off a cab such as a lift cab suitable for harbor handling work or scrap processing work to be performed.
[0002]
[Prior art]
A work machine for carrying out port cargo handling work, for example, attaches a work front to a swiveling body installed on a crawler type traveling body and operates a gripper such as a grapple provided on the work front or a bucket to handle the load on the ship. Unloading and loading work. In such a work machine, when operating the work front, in order to make it easy to check the state of the load in the ship, a cab (hereinafter referred to as a cab) provided on the swivel body itself is a swivel body or It is configured to be able to move upward and forward with respect to the traveling body, so that the inside of the ship can be looked into.
[0003]
In this way, in a work machine in which the cab moves forward, in order to improve transportability during transportation, the cab is returned to the rear to make the transport posture, but the forward movement amount can be set large. Some of the constructed working machines have a structure in which the cab protrudes from the crawler type traveling body to some extent as a transportation posture.
In the working machine having such a structure, the entrance / exit of the cab is positioned in front of the traveling body, so when getting on / off the cab, it is possible to go up and down with a step on the traveling body or a foot on the traveling body. Since it becomes difficult, it is preferable to move up and down by attaching a lifting ladder to the cab.
[0004]
[Problems to be solved by the invention]
However, if the elevating ladder is fixedly attached to the lower part of the cab, when the work machine is transported on the carriage, the ladder may hit the carriage and the ladder may be deformed. Further, it is conceivable that the ladder is made up and down with a driving device, and the cab is raised by the driving device at the time of work by a switch provided in the cab, and the cab is lowered during transportation. However, if the ladder is raised and lowered by the switch, if the operator forgets to pull up the ladder by operating the switch at the start of work, the ladder will continue to protrude downward, so the ladder will be There is a risk of deformation and damage by colliding with other ships and other obstacles. Further, if the ladder protrudes downward when the work implement is self-propelled and placed on the carriage, the ladder may collide with the carriage and cause deformation or breakage.
[0005]
In view of the above problems, an object of the present invention is to provide a swivel working machine having a configuration capable of preventing deformation and breakage due to a collision with a ladder obstacle caused by forgetting to raise or lower a raising / lowering ladder. To do.
[0006]
[Means for Solving the Problems]
The slewing type working machine according to claim 1, via a swivel device on the traveling body set up revolving body, in a slewing type working machine comprising attaching a working front and cab to the swivel body,
A raising / lowering ladder attached to the lower side of the cab so that the driving apparatus can change to a raising / lowering posture that is a hanging posture and a retracted posture that is a posture lifted above the raising / lowering posture;
A gate lock valve for controlling locking and unlocking of the actuator of the working machine;
A gate lock lever for switching the valve position of the gate lock valve;
The raising / lowering ladder is in a raising / lowering posture and a retracted posture in conjunction with an operation state of the gate lock lever.
[0007]
According to this configuration, the operator enters the cab and operates the gate lock lever of the gate lock valve to start the work, thereby releasing the lock state (that is, the operation system of the hydraulic circuit and the hydraulic drive device can be operated). The ladder is automatically placed in the retracted position by the drive device, so the ladder is not left in the raised / lowered position during the work, and the ladder collides with the obstacle during the work and deforms. Or being damaged. Also, when the work implement is placed on the carriage by self-propelling, it is in the unlocked state, so the ladder is maintained in the retracted position by the drive unit, so the ladder may collide with the carriage and be deformed or damaged. Is prevented.
[0008]
The slewing type working machine of claim 2, wherein the slewing type working machine of claim 1, wherein the cab is movable in the cab, the lifting ladders attached to the cab, in the transport position of the cab It is attached to the position which protrudes ahead from a traveling body, It is characterized by the above-mentioned.
[0009]
The present invention can be applied to a general hydraulic excavator or the like. However, when the work machine has a lift cab and the cab protrudes forward from the traveling body during transportation, the traveling body is positioned under the cab. Since there is no foothold, it is particularly effective in practical use.
[0010]
The swivel work machine according to claim 3 is the swivel work machine according to claim 1 or 2 , wherein the swivel work machine is located at a lower side position of the cab and is adjacent to the lift ladder in the front-rear direction of the cab. It is characterized by having a springboard.
[0011]
By providing such a lifting platform, when the operator moves up and down, it is easy to transfer from the lifting ladder to the platform or from the platform to the lifting ladder.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a side view showing an embodiment of a swivel working machine according to the present invention in a transported state, and FIG. 2 is a side view showing a working state (however, the work front is not shown). 1 is a crawler type traveling body of the working machine, 2 is a turning device installed on the traveling body 1, 3 is a turning body installed on the turning device 2, and 4 is a first parallel link 5 to the turning body 3. And a cab attached via a second parallel link 6. Reference numeral 7 denotes a hydraulic power unit mounted on the revolving structure 3, and includes a generator in the case of using a lifting magnet as a work front. 8 is a work for the front, in the present embodiment, mounted for vertical pivoting a boom 10 which is mounted for more undulations hydraulic Cylinders (not shown) to swing body 3, the hydraulic cylinder 11 to the end of the boom 10 The arm 12 is configured to be attached to the tip of the arm 12 by a hydraulic cylinder 13 and a link mechanism 14 so as to be rotatable. As the work tool, a digging bucket, a lifting magnet having an electromagnet, a hawk, a clamshell bucket, a grab, or the like is used. Lifting magnets, clamshell buckets, and grabs are used when loading or unloading iron scraps or scraps on ships attached to the quay.
[0013]
The first parallel link 5 connects both ends of the front link 21 and the rear link 22 to the bracket 19 fixed to the revolving body 3 and the relay bracket 20, and the rear link 22 (or the front link 21) and the revolving body. 3, a drive hydraulic cylinder 24 is attached between the two.
[0014]
The second parallel link 6 connects both ends of the upper link 27 and the lower link 29 to the bracket 26 fixed to the cab 4 and the relay bracket 20, and the lower link 29 (or the upper link 27) and the relay bracket 20 The drive hydraulic cylinder 30 is attached between the two.
[0015]
When this working machine is used for harbor work, when the tide level is relatively low or the ship is small, the hydraulic cylinder 24 of the first parallel link 5 is extended to raise the cab 4 and project forward. The hydraulic cylinder 30 of the second parallel link 6 is contracted and the cab 4 is lowered, so that the work can be performed with the bottom of the ship visible.
[0016]
Further, as shown in FIG. 2, when the height of the rim of the ship increases due to the size of the ship or the tide level, the hydraulic cylinder 30 of the second parallel link 6 is extended according to the height and the height of the cab 4 is increased. Make it high. In this case, since the cab 4 is attached to the swivel body 3 via the first parallel link 5 and the second parallel link 6, when the cab 4 is raised, the first parallel link 5 is pushed forward. The cab 4 can be raised without changing the protruding position of the cab so much, and the state where the bottom of the ship can be seen is maintained.
[0017]
Thus, by attaching the cab 4 via the two-stage parallel links 5 and 6, the degree of freedom in selecting the height of the cab 4 and the protruding position is greatly increased, and workability is improved.
[0018]
Further, as shown in FIG. 1, the hydraulic cylinder 24 of the first parallel link 5 is contracted to tilt the first parallel link 5 backward, and the hydraulic cylinder 30 of the second parallel link 6 is contracted to turn the cab 4. If it is lowered onto the body 3, the total height of the work machine can be lowered, the forward projection width of the cab 4 can be reduced, and the vehicle can be compactly mounted on the transport truck, easily clearing the transport limit height. It becomes possible to do.
[0019]
31 is a raising / lowering ladder attached to the lower part of the cab 4 so that raising / lowering is possible. The attachment structure of the elevating ladder 31 is shown in the side view of FIG. 3 and the front view of FIG. As shown in these drawings, a lifting / lowering ladder 31 mounting frame 33 is attached to the lower surface of the outer side of the cab 4 mounting portion of the revolving structure frame 32. A box 34 containing an emergency ladder is attached to the lifting ladder mounting frame 33, and the lifting ladder 31 is fixed to the frame 33 from a vertically lowered position shown by a solid line in FIG. The bracket 35 is pivoted inwardly about the pin 36 and is attached so as to be lifted in a retracted position along the lower surface of the revolving frame 32 as indicated by a two-dot chain line . Reference numeral 37 denotes a hydraulic cylinder that constitutes a drive device that rotates the elevating ladder 31. The hydraulic cylinder 37 is attached by connecting a bottom side to a bracket 39 fixed to the inner surface of the frame 33 by a pin 40 and connecting a rod to a bracket 41 fixed to the lifting ladder 31 by a pin 42. Reference numeral 38 denotes a rod protection cover for the hydraulic cylinder 37.
[0020]
44 is a lifting platform provided at the lower side of the cab 4 on the side surface of the revolving structure frame 32 and adjacent to the lifting ladder 31 in the longitudinal direction of the cab . By being provided at a position different from the ladder 31 in the front-rear direction, the operator can easily transfer from the elevator 31 to the platform 44 or from the platform 44 to the elevator 31 when moving up and down. Further, the step 44 is erected as shown by a two-dot chain line in FIG. 4 during the operation, so that the step 44 is prevented from protruding to the side so as not to disturb the operation.
[0021]
FIG. 5 shows a drive circuit for the hydraulic cylinder 37. This working machine includes a main hydraulic pump 45 for driving an actuator group 46 for running, turning, extending / contracting the working front 8, extending / contracting the links 5, 6 and the like, and the actuator for each operation of the discharged oil. A control valve group 47 for controlling switching supply and stop to the group 46 is provided, and a pilot hydraulic pump 49 and a pilot valve group 50 for operating these control valve groups 47 are provided. In addition, in the pipe 51 between the pilot hydraulic pump 49 and the pilot valve group 50, the oil discharged from the pilot hydraulic pump 49 is supplied to the oil tank 52 so that the working machine does not operate due to an erroneous operation or the like when the work is stopped. A gate lock valve 53 for discharging is provided. The gate lock lever 54 for switching the gate lock valve 53 is installed on the floor of the cab 4, and when the gate lock lever 54 is pulled up, the gate lock valve 53 is switched to the right position. Returning to 52, the lock state is established. On the other hand, when the gate lock lever 54 is lowered, the gate lock valve 53 is switched to the left position, and the oil discharged from the pilot hydraulic pump 49 is supplied to the pilot valve group 50 to be unlocked.
[0022]
In the present embodiment, a cylinder having a spring 55 built in the bottom chamber a side is used as the hydraulic cylinder 37, and the discharge pipeline 51 of the pilot hydraulic pump 49 is connected to the rod chamber b by a pipeline 56. Therefore, when the operator enters the cab 4 and lowers the gate lock lever 54 to release the lock, the pilot oil from the pilot hydraulic pump 49 is supplied to the rod chamber b of the hydraulic cylinder 37, so that the hydraulic cylinder 37 is shown in FIG. As shown by a two-dot chain line, the elevating ladder 31 is in a retracted posture to be pulled up inward. Therefore, the ladder 31 is not left in a suspended state during work, and the ladder is prevented from being deformed or damaged by colliding with an obstacle during work. Also, when the work implement is placed on the carriage by self-propelling, it is in the unlocked state, so that the ladder 31 is kept lifted by the hydraulic cylinder 37, and the ladder 31 collides with the carriage to be deformed or damaged. Is prevented.
[0023]
Either stop the work, or after placing the working machine carriage, when the locked state by pulling the gate lock lever 54, the oil tank oil in the rod chamber b of the hydraulic cylinder 37 through a gate Torokku valve 53 The hydraulic cylinder 37 is extended by the force of the spring 55 as it flows out to the side 52, and as shown by the solid line in FIG. . When the operator goes up to the cab 4 again, the lifting ladder 31 is in a suspended state.
[0024]
In the present invention, the drive device for the raising / lowering ladder 31 may be configured to operate by detecting the state of the gate lock lever 54 with a sensor. Further, the drive device may be not only a hydraulic type such as a hydraulic cylinder but also an electric type or a pneumatic type. Further, the box 34 for accommodating the emergency ladder may be eliminated, and the elevator ladder 31 may be provided at that position. Further, the raising / lowering ladder 31 may be a telescopic type or a sliding type instead of a rotary type. The present invention can also be applied to general hydraulic excavators and the like and applied machines.
[0025]
【The invention's effect】
According to the present invention, the ladder for raising descending is attached to the lower portion of the cab, for lifting by that the gate lock lever of the gate lock valve to a working state of the actuator of the working machine in the unlocked state drive Since the ladder is in the retracted posture and the raising / lowering ladder is in the raising / lowering posture by the driving device in the locked state, the ladder is prevented from being deformed or damaged by colliding with an obstacle during work. Further, during transportation, the ladder is prevented from colliding with the carriage and being deformed or damaged.
[0026]
According to the invention of claim 2, since the cab is lifted cab protruding forward from the running body in the transport position, the lifting ladders of the present invention is essential for the lift operators, exerts practically important effects .
[0027]
According to the invention of claim 3, since the raising / lowering step is provided in the lower side position of the cab adjacent to the raising / lowering ladder in the front-rear direction of the cab, when the operator moves up / down, the raising / lowering step is performed from the raising / lowering ladder. It is easy to transfer to or from the platform to the elevator ladder.
[Brief description of the drawings]
FIG. 1 is a side view showing an embodiment of a working machine equipped with a lifting ladder according to the present invention in a transported state.
FIG. 2 is a side view showing the working machine in the present embodiment with the cab raised.
FIG. 3 is a side view showing the lifting ladder according to the present embodiment in a suspended state.
FIG. 4 is a front view showing the raising / lowering ladder according to the present embodiment in a state where a solid line is suspended and a two-dot chain line is raised.
FIG. 5 is a diagram showing an example of a hydraulic circuit of a hydraulic cylinder which is a driving device for a lifting ladder according to the present invention.
[Explanation of symbols]
1: traveling body, 2: turning device, 3: turning body, 4: cab, 5: first parallel link, 6: second parallel link, 7: hydraulic power unit, 8: front for work, 9, 11, 13: Hydraulic cylinder, 10: boom, 12: arm, 19: bracket, 20: relay bracket, 21: front link, 22: rear link, 24: hydraulic cylinder, 26: bracket, 27: upper link, 29: lower link, 30 : Hydraulic cylinder, 31: Elevating ladder, 32: Revolving frame, 33: Frame, 34: Emergency ladder storage box, 37: Hydraulic cylinder, 44: Step platform, 45: Main hydraulic pump, 46: Actuator group, 47: Control Valve group, 49: Pilot hydraulic pump, 50: Pilot valve group, 52: Oil tank, 53: Gate lock valve, 54: Gate lock lever

Claims (3)

In a turning type working machine in which a turning body is installed on a traveling body via a turning device, and a work front and a cab are attached to the turning body,
A raising / lowering ladder attached to the lower side of the cab so that the driving apparatus can change to a raising / lowering posture that is a hanging posture and a retracted posture that is a posture lifted above the raising / lowering posture;
A gate lock valve for controlling locking and unlocking of the actuator of the working machine;
A gate lock lever for switching the valve position of the gate lock valve;
The swing working machine characterized in that the raising / lowering ladder is in a raising / lowering posture and a retracted posture in conjunction with an operation state of the gate lock lever . 2. The swivel work machine according to claim 1, wherein the cab is a movable cab, and the elevating ladder attached to the cab is attached to a position protruding forward from the traveling body in the transport posture of the cab. This is a swivel work machine . 3. The turning work machine according to claim 1 , wherein a raising / lowering step is provided at a lower side position of the cab adjacent to the raising / lowering ladder and the front / rear direction of the cab. Type work machine.

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