JP2019156313A - Dismantling machine comprising clamp arm - Google Patents

Abstract

To change an angle of a held dismantling object with respect to a vehicle body without interruption of a dismantling work performed by a working machine.SOLUTION: A dismantling machine is provided that comprises: an undercarriage 11; a revolving superstructure; a working machine; clamp arms 1a, 1b which have arm proximal end parts 2a, 2b connected to a truck frame 11A of the undercarriage 11 in a vertically turnable manner, and have turning cylinders 4a, 4b vertically turning the arm proximal end parts; and control valves V2a, V2b which control a pressure oil supplied to the turning cylinders . The dismantling machine further comprises: arm distal end parts 3a, 3b which are connected to the arm proximal end parts 2a, 2b in a longitudinally slidable manner; slide cylinders 5a, 5b which slide the arm distal end parts with respect to the arm proximal end parts; control valves V3a, V3b which control the pressure oil supplied to the slide cylinders; and operation devices L37, L38 which operate the control valves V2a, V2b, V3a, V3b.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a dismantling machine used for dismantling work such as an automobile, and more particularly to a dismantling machine provided with a clamp arm suitable for combined work with a working machine.

  As a dismantling machine for dismantling a dismantling object such as an automobile, a machine that holds a dismantling object with a clamp arm and disassembles the dismantling object using an attachment such as a grapple attached to a work machine is known (Patent Document) 1 etc.). This type of work machine includes a clamp arm that opens and closes in the left-right direction as described in, for example, Patent Document 2, and holds the dismantling object sandwiched from the left and right by the clamp arm to dismantle the dismantling object There is a machine. In particular, the dismantling machine described in this document is configured so that the clamp arm extends back and forth, and the dismantling object gripped by the clamp arm can be moved back and forth with respect to the vehicle body.

JP 2009-274474 A

Japanese Patent Laid-Open No. 2-186019

  In the dismantling machine of patent document 1, the dismantling object can be translated back and forth with respect to the vehicle body by extending and contracting the clamp that holds the dismantling object as described above. However, for example, in order to make it easier to see the part of the dismantling object that is difficult to see from the driver's seat, the dismantling object held by the clamp arm is rotated around the vertical axis to change the angle of the dismantling object with respect to the vehicle body. I can't. When changing the angle of the dismantling object gripped by the clamp with respect to the vehicle body, once the dismantling object is released, the dismantling object is rotated around the vertical axis by using a work machine, or the dismantling machine with respect to the dismantling object Or have to move. In any case, the angle of the dismantling object cannot be changed with respect to the vehicle body while being held by the clamp arm. When changing the posture of the dismantling object, the clamp arm is released from the dismantling object and dismantling by the work machine. The work must be interrupted.

  An object of the present invention is to provide a dismantling machine including a clamp arm that can change the angle of a dismantling object held with respect to a vehicle body without interrupting dismantling work by a working machine.

  In order to achieve the above object, the present invention includes a traveling body, a revolving body that has a cab and is provided so as to be able to swivel at an upper portion of the traveling body, and a working machine provided at a front portion of the revolving body. A prime mover provided in the revolving body, at least one hydraulic pump driven by the prime mover, first and second arm bases connected to a track frame of the traveling body so as to be vertically rotatable, and First and second clamp arms having first and second rotating cylinders for rotating the first and second arm bases up and down respectively, and the first and second rotations from the hydraulic pump. First and second arm rotation control valves for controlling the pressure oil supplied to the cylinder, and first and second arm rotation operations for operating the first and second arm rotation control valves, respectively. With equipment In the body machine, the first and second arm tips connected to the first and second arm bases so as to be slidable in the longitudinal direction, respectively, the first and second arm bases, and the first And first and second slide cylinders, both ends of which are connected to the distal end portion of the second arm, and the first and second arm distal end portions are slid relative to the first and second arm base portions, respectively. The first and second arm extendable control valves for controlling the pressure oil supplied from the hydraulic pump to the first and second slide cylinders, respectively, and the first and second arm extendable control valves are respectively operated. And a first arm and a second arm extending / contracting operation device.

  According to the present invention, the left and right clamp arms extend and retract as well as move up and down. While holding the dismantling object with the clamp arm, fix one of the left and right clamp arms and expand or contract only the other, or extend one while contracting the other so that the dismantling object can Can be rotated around. Thereby, the angle of the dismantling object with respect to the operator's cab can be adjusted while being pressed by the clamp arm. In other words, when it is difficult to see the target part of the dismantling object to be accessed from the operator's cab, the dismantling target is easy to see without interrupting the dismantling work by the working machine by the combined operation of the working machine and the clamp arm. You can change the posture of things. Since the attachment can be easily accessed by changing the direction of the object to be disassembled during the dismantling work, the efficiency and accuracy of the dismantling work can be improved.

The side view of the dismantling machine concerning one embodiment of the present invention. FIG. 1 is a plan view of the inside of a cab provided in the dismantling machine of FIG. FIG. 1 is a plan view of a clamp arm provided in the dismantling machine of FIG. Schematic diagram of an example of a circuit of a hydraulic system provided in the dismantling machine of FIG. FIG. 4 is a circuit diagram of a main part of the hydraulic system. The top view showing a mode that a dismantling object is rotationally moved by the expansion-contraction operation | movement of a clamp arm with the dismantling machine of FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

-Demolition machine-
FIG. 1 is a side view of a dismantling machine according to an embodiment of the present invention. In this embodiment, the left and right in FIG.

  The dismantling machine shown in the figure is based on a hydraulic excavator, and includes a vehicle body 10, a work machine (front work machine) 20, and left and right clamp arms 1a and 1b (FIG. 3). The vehicle body 10 includes a traveling body 11 and a revolving body 12.

  The traveling body 11 is a crawler type provided with left and right crawlers 13 having endless track tracks in the present embodiment, and travels by driving the left and right crawlers 13 by the left and right traveling drive devices 14, respectively. The travel drive device 14 includes travel motors M1 and M2 (FIG. 4), which are hydraulic motors, and a speed reducer. A track frame 11A that is a frame of the traveling body 11 includes a center frame 11a, left and right side frames 11b, and left and right arm brackets 11c (FIG. 3). The center frame 11a is a part on which the revolving body 12 is mounted, and connects the left and right side frames 11b. The left and right side frames 11b extend in the front-rear direction, and constitute a frame for the left and right crawlers 13. The left and right arm brackets 11c are provided at left and right symmetrical positions in the front portion of the center frame 11a, and extend forward to the vicinity of the front end portion (front end portion of the crawler 13) of the traveling body 11 (FIG. 3). The left and right arm brackets 11c are connected to each other by a cross member 11d (FIG. 3), and are connected to the left and right side frames 11b of the track frame 11A by a beam 11e (FIG. 3), thereby ensuring high rigidity. .

  The revolving structure 12 is provided on the upper part of the traveling body 11 via a revolving wheel 15 so as to be revolved, and includes a revolving frame 16, a cab 17, a counterweight 18 and a building cover 19. The turning frame 16 constitutes a base frame of the turning body 12 and is provided on the upper part of the center frame 11a of the traveling body 11 via the turning wheel 15 so as to be turnable around a vertical axis. The operator's cab 17 is for an operator to board, and is mounted on the front part of the swivel frame 16 (on the left side of the front part in this embodiment). The counterweight 18 serves to balance the weight with the work machine 20 and is mounted at the rearmost part of the revolving frame 16. The building cover 19 is a cover that surrounds a hydraulic system (described later) including the prime mover 41 (FIGS. 4 and 5), and the rear side of the cab 17 in the revolving frame 16 (between the cab 17 and the counterweight 18). It is mounted on. The prime mover 41 is an engine (internal combustion engine) or an electric motor. The turning device for connecting the turning body 12 to the traveling body 11 includes a turning motor M3 (FIG. 4), and the turning body 12 is driven by the turning motor 11 with respect to the traveling body 11 to turn. The turning motor M3 in the present embodiment is a hydraulic motor, but an electric motor may be used, or both a hydraulic motor and an electric motor may be used.

  The work machine 20 is provided in the front part of the revolving structure 12 (right side of the cab 17 in this embodiment). The work machine 20 is an articulated front working device that includes a boom 21, an arm 22, an attachment 23, a boom cylinder 24, an arm cylinder 25, and an attachment cylinder 26. In this embodiment, the case where a grapple is attached to the work machine 20 as the attachment 23 is illustrated, but attachments other than the grapple can also be attached to the work machine 20 as the attachment 23 and used.

  The boom 21 is connected to the revolving frame 16 by pins extending left and right. Both ends of the boom cylinder 24 are connected to the boom 21 and the swing body 12, and the boom 21 rotates up and down with respect to the swing body 12 as the boom cylinder 24 extends and contracts. The arm 22 is connected to the tip of the boom 21 by a pin extending in the left-right direction. Both ends of the arm cylinder 25 are connected to the arm 22 and the boom 21, and the arm 22 rotates back and forth with respect to the boom 21 as the arm cylinder 25 expands and contracts. The attachment 23 is connected to the tip of the arm 22 by a pin extending left and right. The attachment cylinder 26 has a proximal end connected to the arm 22 and a distal end connected to the attachment 23 and the arm 22 via a link 27. The attachment 23 rotates with respect to the arm 22 as the attachment cylinder 26 expands and contracts. The attachment 23 which is a grapple is provided with an open / close cylinder C1 (FIG. 4) for opening and closing the claws 23a and 23b. The boom cylinder 24, the arm cylinder 25, the attachment cylinder 26, and the opening / closing cylinder C1 constitute a hydraulic cylinder that drives the work machine 20.

-Cab-
FIG. 2 is a plan view of the inside of the cab. As described above, the cab 17 is supported by the front portion of the upper part of the turning frame 16 (FIG. 1) and is offset to one side in the left-right direction (left side in this example) with respect to the turning center of the turning frame 16. However, the cab 17 may be arranged on the right side of the aircraft. A driver's seat 31, operation levers 32 and 33, lever pedals 34 and 35, an attachment pedal 36, clamp pedals 37 and 38, a gate lock lever 39 and the like are disposed inside the cab 17.

  The operation levers 32 and 33 are arranged on the left and right of the driver's seat 31 where the operator sits. These operation levers 32 and 33 are operation members of an operation device (not shown) that operates the boom cylinder 24, the arm cylinder 25, the attachment cylinder 26, and the turning motor M3 to drive the work machine 20 and the turning body 12. The left operation lever 32 serves as two operation members of the boom cylinder 24, the arm cylinder 25, the attachment cylinder 26, and the turning motor M3. One actuator is operated in the front-rear direction, and the other actuator is operated in the left-right direction. Is instructed. The right operating lever 33 serves as the remaining two operating members of the boom cylinder 24, the arm cylinder 25, the attachment cylinder 26, and the turning motor M3. One actuator is operated in the front-rear direction, and the other is operated in the left-right direction. The operation of the actuator is instructed. The left operation lever 32 has a stick-like shape extending vertically, and is provided with a changeover switch SW1 (described later) at a position (upper end surface portion) that can be easily operated with the left thumb. The right operation lever 33 has a stick-like shape that extends vertically, and is provided with a changeover switch SW2 (described later) at a position (upper end surface portion) that can be easily operated with the right thumb. One of the change-over switches SW1 and SW2 may be omitted.

  The left and right lever pedals 34 and 35 are operation members of an operating device (not shown) that drives the traveling body 11 by operating the left and right traveling motors M1 and M2, respectively. These lever pedals 34 and 35 are provided side by side on the front side of the driver's seat 31 and both have a lever portion and a pedal portion so that they can be easily operated with either hands or feet. The attachment pedal 36 operates the hydraulic actuator of the attachment 23 (in this example, the opening / closing cylinder C1 in FIG. 4) to drive the attachment 23 (in this example, opens and closes the claws 23a and 23b). It is. The attachment pedal 36 is provided on the front side of the driver's seat 31 and on the right side of the lever pedals 34 and 35.

  The clamp pedals 37 and 38 are operating members of operating devices L37 and L38 (FIG. 5) that operate rotating cylinders 4a and 4b and slide cylinders 5a and 5b, which will be described later, to drive the left and right clamp arms 1a and 1b. These clamp pedals 37 and 38 are arranged side by side on the left side of the lever pedal 34 on the front side of the driver's seat 31. The clamp pedals 37 and 38 are arranged close to the left and right so that they can be depressed simultaneously with one foot. The left and right operation levers 32 and 33 are operation members operated by hand, while the clamp pedals 37 and 38 are operation members operated by feet. This is a consideration for enabling combined operation of the work machine 20 and the left and right clamp arms 1a, 1b by simultaneous operation using the left and right clamp pedals 37, 38 and the limbs of the operation levers 32, 33.

  The gate lock lever 39 is a lever-like gate installed on the boarding / exiting side (left side in this example) of the driver's seat 31 so as to prevent the operator from getting off in the lying position. The operator cannot get off unless the gate lock lever 39 is pulled up to open the boarding / alighting portion for the driver's seat 31. The gate lock lever 39 also serves as an interlock operation member of the operation system of the dismantling machine, and the dismantling machine does not operate in a state where the passenger seat 31 of the driver's seat 31 is opened, and the gate lock lever 39 is not seated and pushed down. The dismantling machine cannot be operated.

−Clamp arm−
FIG. 3 is a plan view of the clamp arm. The left and right clamp arms 1a and 1b press the dismantling object A located in front of the traveling body 11 from above when dismantling the dismantling object A (FIG. 1) typified by an automobile by the work machine 20. . 1 and 3, the left clamp arm 1a includes an arm base 2a, an arm tip 3a, a rotating cylinder 4a, and a slide cylinder 5a. Similarly, the right clamp arm 1b includes an arm base 2b, an arm tip 3b, a rotating cylinder 4b, and a slide cylinder 5b.

  The arm base 2a is a member constituting a base end side portion of the left clamp arm 1a, and can be turned up and down via a pin 6 extending to the left and right at the tip (front end) of the left arm bracket 11c of the track frame 11A. It is connected. Similarly, the arm base 2b is a member constituting a base end side portion of the right clamp arm 1b, and is connected to the tip of the right arm bracket 11c of the track frame 11A via a pin 6 so as to be pivotable up and down. Yes. The left and right arm bases 2a and 2b are spaced apart from each other on the left and right sides, and can be turned up and down independently of each other with respect to the track frame 11A. It is configured in a bent shape. However, the arm bases 2a and 2b are both arranged between the left and right crawlers 13 and are configured to fit at least in the vehicle width (the width in the left-right direction of the traveling body 11) including the portion protruding forward from the crawler 13. Yes. Further, the pin 6 is shared by the left and right clamp arms 1a and 1b, and the structure in which the rigidity of the support structure of the clamp arms 1a and 1b is increased is illustrated. However, the arm base 2a and the arm bracket are provided by the left and right clamp arms 1a and 1b. 11c may be connected with separate pins.

  The left arm tip 3a is slidably connected to the tip of the corresponding left arm base 2a in the longitudinal direction (front-rear direction). Similarly, the right arm tip 3b is connected to the tip of the corresponding right arm base 2b so as to be slidable in the longitudinal direction (front-rear direction). The left and right arm tip portions 3a and 3b are spaced apart from each other at a position on the front side of the traveling body 11 and can be slid independently from each other. It is configured. However, the arm tip portions 3a and 3b are laid out so as to fit at least within the vehicle width (the width in the left-right direction of the traveling body 11). It is mainly arm tip portions 3a and 3b that hold the dismantling object A typified by an automobile, and the lower surfaces of the arm tip portions 3a and 3b are provided with irregularities for gripping the dismantling object A that has been pressed. (FIG. 1).

  The left rotation cylinder 4a is a hydraulic cylinder that rotates the corresponding left arm base 2a up and down, and is connected to the arm base 2a and the left arm bracket 11c by pins 7a. Similarly, the right rotation cylinder 4b is a hydraulic cylinder that rotates the corresponding right arm base 2b up and down, and both ends of the right rotation cylinder 4b are connected to the arm base 2b and the right arm bracket 11c by pins 7b. Since the rotation cylinders 4a and 4b of the present embodiment are arranged above the arm bases 2a and 2b and the left and right arm brackets 11c, the clamp arms 1a and 1b are raised when contracted and the clamp arms 1a and 1b are expanded when extended. Descend. Further, the rotating cylinders 4a and 4b are protected by the arm base portions 2a and 2b and the left and right arm brackets 11c, and hardly interfere with obstacles on the ground.

  The left slide cylinder 5a is a hydraulic cylinder that slides the left arm tip 3a with respect to the corresponding left arm base 2a, and both ends thereof are connected to the arm base 2a and the arm tip 3a by pins 8a. Similarly, the right slide cylinder 5b is a hydraulic cylinder that slides the right arm tip 3b with respect to the corresponding right arm base 2b. Both ends of the right slide cylinder 5b are connected to the arm base 2b and the arm tip 3b by pins 8b. Yes. When the slide cylinders 5a and 5b expand and contract, the arm tip portions 3a and 3b move back and forth, and the clamp arms 1a and 1b expand and contract. The slide cylinders 5a and 5b according to the present embodiment are disposed above the arm bases 2a and 2b and the arm tip parts 3a and 3b, and the dismantling object A and the obstacles on the ground, etc. that are pressed down by the clamp arms 1a and 1b. It is difficult to interfere.

-Hydraulic system-
FIG. 4 is a schematic diagram of an example of a circuit of a hydraulic system provided in the dismantling machine of the present embodiment. The hydraulic system shown in this figure includes a hydraulic circuit X related to the operation of the traveling body 11, the revolving structure 12, and the work machine 20, and a hydraulic circuit Y related to the operation of the clamp arms 1a and 1b. The hydraulic circuit X is a drive circuit for the hydraulic actuator of the work machine 20, the traveling motors M1 and M2, and the swing motor M3. The prime mover 41, the hydraulic pumps 42 and 43, the pilot pump 44 (FIG. 5), the control valves V1 to V7, V1'-V3 'and each operation device (Drawing 2) are provided. In the case of this embodiment, the hydraulic actuator of the work machine 20 includes a boom cylinder 24, an arm cylinder 25, an attachment cylinder 26, and an opening / closing cylinder C1. The hydraulic pumps 42 and 43 are, for example, variable displacement pumps that discharge the pressure oil that drives the hydraulic actuator, and are driven by the prime mover 41. The control valves V1 to V7 and V1 ′ to V3 ′ are appropriately driven by the discharge oil of the pilot pump 44 according to the operation of each operation device described in FIG. 2, and the corresponding hydraulic actuators are discharged by the discharge oil of the hydraulic pumps 42 and 43. Driven. In the circuit illustrated in FIG. 4, depending on the operating conditions, the oil discharged from the hydraulic pumps 42 and 43 is supplied to the boom cylinder 24, the arm cylinder 25, the attachment cylinder 26, and the swing motor M3. The travel motor M1 and the hydraulic circuit Y are driven only by the oil discharged from the hydraulic pump 42, and the travel motor M2 and the opening / closing cylinder C1 are driven only by the oil discharged from the hydraulic pump 43.

  FIG. 5 is a circuit diagram of a hydraulic circuit Y which forms a main part of the hydraulic system of FIG. 4 in the present embodiment. The hydraulic circuit Y includes the above-described prime mover 41, hydraulic pump 42, pilot pump 44, rotating cylinders 4a and 4b, slide cylinders 5a and 5b, control valves V2a, V2b, V3a and V3b, operating devices L37 and L38, switching Valves V37 and V38 are provided.

  The control valve V2a is a left arm rotation control valve for operating the left rotation cylinder 4a which is a corresponding hydraulic actuator, and is connected to a hydraulic line connecting the rotation cylinder 4a, the hydraulic pump 42 and the tank T. Is provided. The control valve V3a is a left arm expansion / contraction control valve for operating the left slide cylinder 5a, which is a corresponding hydraulic actuator, and is provided in a hydraulic line connecting the slide cylinder 5a, the hydraulic pump 42, and the tank T. ing. Similarly, the control valve V2b is a right arm rotation control valve for operating the right rotation cylinder 4b, which is a corresponding hydraulic actuator, and hydraulic pressure that connects the rotation cylinder 4b to the hydraulic pump 42 and the tank T. It is provided in the pipeline. The control valve V3b is a right arm expansion / contraction control valve for operating the right slide cylinder 5b, which is a corresponding hydraulic actuator, and is provided in a hydraulic line connecting the slide cylinder 5b, the hydraulic pump 42, and the tank T. ing. These control valves V2a, V2b, V3a, V3b are constituted by hydraulically driven directional control valves that control the flow (direction and flow rate) of pressure oil supplied from the hydraulic pump 42 to the corresponding hydraulic actuator.

  The operating device L37 is an operating device for operating the left clamp arm 1a. The operating device L37 also serves as a left arm turning operating device for operating the control valve V2a and a left arm extending / contracting operating device for operating the control valve V3a. Specifically, the operating device L37 is a hydraulic lever device and includes pilot valves 37a and 37b. The pilot pump 44 is connected to the primary port of the pilot valve 37a, and the secondary port is connected to the pressure receiving portions of the control valves V2a and V3a. The switching valve V37 is provided in a pilot line connecting the secondary port of the pilot valve 37a and the pressure receiving portions of the control valves V2a and V3a. The switching valve V37 is normally switched to the switching position on the left side in the figure by a spring force, and the pilot valves 37a and 37b are connected to the pressure receiving portion of the control valve V2a corresponding to the left rotating cylinder 4a. When the pilot pressure is received by the pressure receiving portion, the switching valve V37 is switched to the switching position on the right side in the figure, and the pilot valves 37a and 37b are connected to the pressure receiving portion of the control valve V3a corresponding to the left slide cylinder 5a. The change-over valve V37 of this embodiment is constituted by a solenoid valve, and the electric switches that connect the solenoid and the power supply Es provided in the swing body 12 are provided with the change-over switches SW1 and SW2 constituting a parallel circuit. Yes. The selector switches SW1 and SW2 of the present embodiment are normally in contact with each other, and the solenoid of the selector valve V37 is demagnetized. When at least one contact is closed by the operation of the changeover switches SW1 and SW2, the solenoid is excited and the changeover valve V37 is switched to the changeover position on the right side in the drawing. The changeover switches SW1 and SW2 together with the changeover valve V37 constitute an operation changeover device that selectively switches the operation target of the operation device L37 to one of the control valves V2a and V3a.

  Similarly, the operating device L38 is an operating device for operating the right clamp arm 1b. The operating device L38 also serves as a right arm rotating operating device for operating the control valve V2b and a right arm extending / contracting operating device for operating the control valve V3b. Specifically, the operating device L38 is a hydraulic lever device and includes pilot valves 38a and 38b. The pilot pump 44 is connected to the primary port of the pilot valve 38a, and the secondary port is connected to the pressure receiving portions of the control valves V2b and V3b. The switching valve V38 is provided on the pilot line connecting the secondary port of the pilot valve 38a and the pressure receiving portions of the control valves V2b and V3b. The switching valve V38 is normally switched to the switching position on the left side in the drawing by a spring force, and the pilot valves 38a and 38b are connected to the pressure receiving portion of the control valve V2b corresponding to the right rotating cylinder 4b. When the pilot pressure is received by the pressure receiving portion, the switching valve V38 switches to the right switching position in the figure, and connects the pilot valves 38a and 38b to the pressure receiving portion of the control valve V3b corresponding to the right slide cylinder 5b. The switching valve V38 of the present embodiment is constituted by a solenoid valve, and the electrical wiring connecting the solenoid and the power supply Es is cut off and opened by the switching switches SW1 and SW2. As with the switching valve V37, when at least one contact of the switching switches SW1 and SW2 is closed, the switching position is switched to the switching position on the right side in the figure. The changeover switches SW1 and SW2 also serve as an operation switching device that selectively switches the operation target of the operating device L38 to one of the control valves V2b and V3b together with the switching valve V38.

-Operation-
For example, in dismantling automobiles, it may be required to take out fine parts such as a harness in a good reusable state from the viewpoint of parts reuse. When such a dismantling operation is performed with the dismantling machine of the present embodiment, the dismantling object A is pressed by the clamp arms 1a and 1b in a state where the target parts are easily visible from the driver's seat 31, and the target 23 is attached by the attachment 23 of the work machine 20. Grasp the site. Thereafter, the boom cylinder 24, the arm cylinder 25, and the attachment cylinder 26 are appropriately driven while the dismantling object A is being held by the clamp arms 1a and 1b, and the attachment 23 is lifted to take out the target part from the dismantling object A.

  The operation of pressing the dismantling object A with the clamp arms 1a and 1b is performed by operating the clamp pedals 37 and 38 to drive the rotating cylinders 4a and 4b and the slide cylinders 5a and 5b.

  When the clamp arms 1a and 1b are driven up and down, the clamp pedals 37 and 38 are depressed while the changeover switches SW1 and SW2 are turned off (contacts are opened). Since the contacts of the changeover switches SW1 and SW2 are open, the changeover valves V37 and V38 are switched to the left changeover position in the drawing as shown in FIG. In this state, when the clamp pedals 37 and 38 are raised and operated to the operation side (for example, the rear part of the pedal is depressed), the pilot pressure generated by the pilot valves 37b and 38b acts on the pressure receiving part on the right side of the control valves V2a and V2b. As a result, the spools of the control valves V2a and V2b move to the left side in the figure, the control valves V2a and V2b are switched to the switching position on the right side in the figure, the rotating cylinders 4a and 4b contract, and the clamp arms 1a and 1b move upward. To turn. On the contrary, when the clamp pedals 37 and 38 are operated to the lowering operation side (for example, the front part of the pedal is depressed), the pilot pressure generated by the pilot valves 37a and 38a acts on the pressure receiving portion on the left side of the control valves V2a and V2b. As a result, the spools of the control valves V2a and V2b are moved to the right side in the figure, the control valves V2a and V2b are switched to the switching position on the left side in the figure, the rotating cylinders 4a and 4b are extended, and the clamp arms 1a and 1b are moved downward. To turn.

  When only the left clamp arm 1a is raised, only the clamp pedal 37 is operated. When only the right clamp arm 1b is raised, only the clamp pedal 38 is raised and operated. When only the left clamp arm 1a is lowered, only the clamp pedal 37 is operated, and when only the right clamp arm 1b is lowered, only the clamp pedal 38 is operated to the lowering side. When the clamp pedals 37 and 38 are operated in opposite directions, one of the clamp arms 1a and 1b rotates in the up direction and the other rotates in the down direction.

  When the clamp arms 1a and 1b are extended and contracted, the clamp pedals 37 and 38 are depressed while the changeover switches SW1 and SW2 are turned on (contacts are closed). Since the contacts of the changeover switches SW1 and SW2 are closed, the changeover valves V37 and V38 are switched to the switching position on the right side in FIG. When the clamp pedals 37 and 38 are operated to the extension operation side in this state (for example, the front part of the pedal is depressed), the pilot pressure generated by the pilot valves 37a and 38a acts on the pressure receiving portion on the left side of the control valves V3a and V3b. . As a result, the spools of the control valves V3a and V3b are moved to the right side in the figure, and the control valves V3a and V3b are switched to the switching position on the left side in the figure. When the control valves V3a and V3b are switched to the switching position on the left side in the figure, the slide cylinders 5a and 5b extend, the arm tip portions 3a and 3b slide forward, and the clamp arms 1a and 1b extend. On the contrary, when the clamp pedals 37 and 38 are operated to the contraction operation side (for example, the rear part of the pedal is depressed), the pilot pressure generated by the pilot valves 37b and 38b acts on the pressure receiving part on the right side of the control valves V3a and V3b. As a result, the spools of the control valves V3a and V3b are moved to the left side in the figure, and the control valves V3a and V3b are switched to the switching position on the right side in the figure. When the control valves V3a and V3b are switched to the switching position on the right side in the figure, the slide cylinders 5a and 5b contract, the arm tip portions 3a and 3b slide rearward, and the clamp arms 1a and 1b contract.

  When only the left clamp arm 1a is extended, only the clamp pedal 37 is operated, and when only the right clamp arm 1b is extended, only the clamp pedal 38 is operated to the extension operation side. When only the left clamp arm 1a is contracted, only the clamp pedal 37 is operated, and when only the right clamp arm 1b is contracted, only the clamp pedal 38 is operated to the contraction operation side. When the clamp pedals 37 and 38 are operated in the opposite directions, one of the clamp arms 1a and 1b expands and the other contracts.

-Effect-
(1) In the present embodiment, the left and right clamp arms 1a and 1b expand and contract as well as move up and down. While holding the dismantling object A with the clamp arms 1a and 1b, one of the clamp arms 1a and 1b is fixed and only the other is expanded or contracted, or one is extended and the other is contracted at the same time as shown in FIG. 10, the dismantling object A can be rotated around the vertical axis. Thus, the angle of the dismantling object A with respect to the vehicle body 10 can be adjusted while being held by the clamp arms 1a and 1b. That is, when the target part of the dismantling object A to which the work machine 20 is accessed is difficult to see from the cab 17, the target part can be obtained without interrupting the dismantling work by the work machine 20 by the combined operation of the work machine 20 and the clamp arms 1a and 1b. The posture of the dismantling object A is changed so that it is easy to see. Since the attachment 23 can be easily accessed by changing the direction of the dismantling object A during the dismantling work, the efficiency and accuracy of the dismantling work can be improved. Further, by simultaneously expanding and contracting the left and right clamp arms 1a and 1b, the dismantling object A can be rotated around a horizontal axis extending left and right, and the dismantling object A is rolled back and forth while disassembling. Can be changed or turned over.

  (2) The operation objects of the clamp pedals 37 and 38 can be selectively switched to any one of the rotation cylinders 4a and 4b and the slide cylinders 5a and 5b by the changeover switches SW1 and SW2. In other words, the clamp pedals 37 and 38 can be used as both the operation member of the operation device for the rotation operation of the clamp arms 1a and 1b and the operation member of the operation device for the telescopic operation. Thereby, in addition to the operation member for the vertical rotation operation of the clamp arms 1 a and 1 b, the operation member for the expansion and contraction operation can be effectively arranged in a narrow space around the driver seat 31 in the cab 17. However, if there is a sufficient space around the driver's seat 31 in the cab 17, four operation members (lever, pedal, switch, etc.) for rotating the clamp arms 1a and 1b and extending and retracting are provided separately. May be.

-Modification-
In the above-described embodiment, an example in which the operation devices L37 and L38 are hydraulic is described, but an electric operation device may be employed. In that case, the control valves V2a, V2b, V3a, and V3b are electromagnetic valves, or electromagnetic valves that open and close the pilot lines connected to the pressure receiving portions of the control valves V2a, V2b, V3a, and V3b are provided. The control valves V2a, V2b, V3a, V3b or the solenoid valves are driven by electric signals output from a controller (not shown) based on the operation signals of the changeover switches SW1, SW2 and the operation devices L37, L38. Also in this case, the effects (1) and (2) can be obtained.

  Further, the case where the present invention is applied to the dismantling machine including the crawler type traveling body 11 has been described as an example. However, the present invention can be applied even if the traveling body 11 is replaced with a wheel type, and similar effects are obtained. Can be obtained.

1a, 1b ... Clamp arm, 2a, 2b ... Arm base (first and second arm base), 3a, 3b ... Arm tip (first and second arm tip), 4a, 4b ... Rotating cylinder (First and second rotating cylinders), 5a, 5b ... slide cylinders (first and second slide cylinders), 11 ... traveling body, 11A ... track frame, 12 ... swivel body, 17 ... cab, 20 ... work machine, 41 ... prime mover, 42, 43 ... hydraulic pump, L37, L38 ... operation device (first and second arm rotation operation devices, first and second arm telescopic operation devices, first and first 2 arm clamp operating device), SW1, SW2... Switch (operation switching device), V2a, V2b... Control valve (first and second arm rotating control valves), V3a, V3b. (First and second arm telescoping control valve), V37, V38 ... switching valve (operating switching device)

Claims (2)

A traveling body, a revolving body having a driver's cab and provided at an upper portion of the traveling body so as to be able to swivel, a working machine provided at a front portion of the revolving body, a prime mover provided in the revolving body, At least one hydraulic pump driven by a prime mover, first and second arm bases that are pivotally connected to a track frame of the traveling body, and the first and second arm bases are vertically First and second clamp arms having first and second rotating cylinders to be rotated, and pressure oil supplied from the hydraulic pump to the first and second rotating cylinders, respectively. A demolition machine comprising: 1 and 2 arm rotation control valves; and first and second arm rotation operation devices for operating the first and second arm rotation control valves, respectively.
First and second arm tips connected slidably in the longitudinal direction to the first and second arm bases, respectively;
Both ends are connected to the first and second arm bases and the first and second arm tips, and the first and second arm tips are respectively connected to the first and second arm bases. First and second slide cylinders for sliding;
First and second arm expansion and contraction control valves for controlling the pressure oil supplied from the hydraulic pump to the first and second slide cylinders, respectively;
A demolition machine comprising a clamp arm, characterized in that it comprises first and second arm expansion / contraction operation devices for operating the first and second arm expansion / contraction control valves, respectively. A dismantling machine comprising the clamp arm according to claim 1.
First and second arm clamping operation devices that also serve as the first and second arm rotation operation devices and the first and second arm extension / contraction operation devices;
An operation switching device that selectively switches an operation target of the first arm clamp operation device to either the first arm rotation control valve or the first arm extension / contraction control valve;
An operation switching device that selectively switches an operation target of the second arm clamp operation device to either the second arm rotation control valve or the second arm expansion / contraction control valve. Dismantling machine equipped with the characteristic clamp arm.

Images