JP2005188133A - Construction machinery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To select either a normal operation device or a preliminary operation device depending on working details, taste, etc., when work is performed by using another working implement as an alternative to a bucket. <P>SOLUTION: In this construction machinery, a pilot circuit switching valve 17, which performs mutual switching between pilot lines 16D and 16E between operating levers 13 and 14 and a spare pedal 15, and a bucket control valve 12D and a fork control valve 12E, is provided between the operating levers 13 and 14 and the control valve 12D, and between the spare pedal 15 and the control valve 12E. Thus, when, for example, a material is transported by using a working device 6 based on grapple specifications, the right operating lever 14 enables a fork 6D1 of a hydraulic grapple 6D to be finely operated for opening/closing by switching the switching valve 17 from a switching position (a) to a switching position (b). Additionally, an operator, which is used to operating a mechanical grapple, can also simply operate the hydraulic grapple 6D. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a construction machine such as a hydraulic excavator or a wheel loader to which another work tool is attached by exchanging it with a bucket of a work device, for example.

  In general, a hydraulic excavator as a construction machine is provided with a lower traveling body, an upper revolving body mounted on the lower traveling body via a swivel device so as to be capable of swiveling, and an upside-down movable body at the front of the upper revolving body. It is roughly constituted by a working device.

  The work device is roughly constituted by a boom, an arm, and a bucket, and a boom cylinder, an arm cylinder, and a bucket cylinder that drive these. On the other hand, the working device of the hydraulic excavator can change the form according to the work content. That is, when performing excavation work of earth and sand, a bucket is attached to the front end side of the work device. For example, when performing dismantling work of a building, transporting materials such as steel, wood, etc., the front end side of the work device A grapple having a fork that can be opened and closed can be attached (see, for example, Patent Document 1).

  Further, the upper swing body includes a swing frame, an engine mounted on the rear side of the swing frame and driving a hydraulic pump, and a boom cylinder, an arm cylinder, and a bucket cylinder of the working device by supplying pilot pressure to the hydraulic pilot section. A plurality of control valves that respectively control a swing motor of a swing device, a spare cylinder that drives a fork of a grapple, and the like, provided in the vicinity of the driver's seat, located on the front side of the swing frame, and operating a pilot valve Left and right work levers for supplying pilot pressure to the control valves for controlling the work device and the control valve for controlling the swivel device, and provided at the front foot of the driver's seat, operating the pilot valve to And a reserve pedal for supplying pilot pressure to a control valve for controlling the grapple fork.

  When operating a hydraulic excavator equipped with a working device with a bucket attached to the tip side, the left and right working levers are operated and pilot pressure is supplied to each control valve to discharge from the hydraulic pump. Is supplied to each cylinder of the working device. As a result, the boom cylinder moves the boom up and down, the arm cylinder moves the arm up and down, and the bucket cylinder rotates the bucket, so that the sand can be excavated with the bucket.

  On the other hand, when operating a hydraulic excavator equipped with a work device with a grapple attached to the tip side, the boom is lifted by the boom cylinder by operating the left and right work levers, and the arm is moved by the arm cylinder. The grapple can be rotated with the bucket cylinder. Then, by stepping on the spare pedal, each fork of the grapple can be opened and closed with the spare cylinder, and the waste material or the like can be grasped with each fork.

Japanese Patent Laid-Open No. 2002-21109

  By the way, in the hydraulic excavator by the prior art mentioned above, each fork of a grapple can be opened and closed by operating a reserve pedal with a foot. Here, each fork of a grapple not only grasps scrap materials of a dismantled building, but sometimes grips materials such as steel and wood at a construction site. In such a case, it is necessary to carefully open and close the fork so as not to damage steel, wood and the like. However, since each fork is opened and closed by operating the spare pedal with a foot, there is a problem that delicate operation is difficult and workability is lowered.

  In addition to the above-described hydraulic grapple that opens and closes the fork using a spare cylinder, the grapple includes a mechanical grapple that opens and closes the fork using a bucket cylinder. This mechanical grapple can be opened and closed by a work lever. For this reason, when an operator accustomed to the mechanical grapple operates the hydraulic grapple, there is a problem in that the difference in operation method is confused and the workability is lowered.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to change a normal operation device and a preliminary operation device to work contents and preferences when working with other work tools instead of buckets. It is an object of the present invention to provide a construction machine that can be selected according to, etc., and can improve workability.

  A construction machine according to a first aspect of the present invention is provided with a vehicle body, a working device provided at a front portion of the vehicle body so as to be able to move up and down, and capable of selectively attaching a bucket and another work tool to a front end side, and the vehicle body. A control valve for controlling the working device, an operating device used when operating the working device including the bucket, and used for operating the working tool when another working tool is attached to the working device. And a preliminary operation device.

  In order to solve the above-described problem, the feature of the configuration adopted by the invention of claim 1 is that it controls between the operating device and a control valve that controls the bucket, and controls the preliminary operating device and other work tools. In other words, switching means for switching between the control valves is provided.

  A construction machine according to a second aspect of the present invention is provided with a vehicle body, a working device provided at the front portion of the vehicle body so as to be able to move up and down, and capable of selectively attaching a bucket and another work tool to the front end side, and provided in the vehicle body A plurality of control valves for controlling the actuators of the working device including the bucket and the actuators of the other working tools by supplying pilot pressure to the hydraulic pilot unit, and an operating device for operating the working device And a preliminary operation device that operates the work tool when another work tool is attached to the distal end side of the work device.

  In order to solve the above-described problem, the feature of the configuration adopted by the invention of claim 2 is that between the operation device and a control valve that controls the actuator of the bucket, and between the preliminary operation device and the other A switching valve that switches a pilot circuit between the two operating devices and the two control valves is provided between the control valve that controls the actuator of the work tool.

  A construction machine according to a third aspect of the present invention is provided with a lower traveling body, an upper revolving body mounted on the lower traveling body via a swivel device so as to be capable of swiveling, and a front traveling portion of the upper revolving body that can be raised and lowered. And the upper revolving unit includes the bucket when a pilot pressure is supplied to a hydraulic pilot unit. A plurality of control valves that respectively control the actuators of the swiveling device and the actuator of the other working tool, an operating device that operates the working device and the swiveling device, and another on the tip side of the working device. And a preliminary operation device for operating the work tool when the work tool is attached.

  In order to solve the above-described problem, the feature of the configuration of the invention of claim 3 is that between the operation device and a control valve that controls the actuator of the bucket, and between the preliminary operation device and the other A switching valve that switches a pilot circuit between the two operating devices and the two control valves is provided between the control valve that controls the actuator of the work tool.

  According to the invention of claim 4, the operating device is a manual lever operated by hand, and the preliminary operating device is a foot pedal operated by a foot.

  According to a fifth aspect of the present invention, a pattern switching valve for switching a combination pattern of the operation pattern of the operating device and the control valve is provided between the operating device and the control valve.

  According to the first aspect of the present invention, by operating the operating device, the working device having the bucket attached to the tip side can be moved up and down. Further, when another work tool is attached to the work device instead of the bucket, the other work tool can be driven while operating the preliminary operation device together with the operation device to raise and lower the work device. In addition, by switching between the operation device and the control valve for controlling the bucket and between the preliminary operation device and the control valve for controlling another work tool so as to be exchanged with each other by the switching means, the operation device can The work tool can be operated, and the bucket can be operated with the preliminary operation device.

  As a result, when the work is performed with another work tool instead of the bucket, the normal operation device and the preliminary operation device can be selected according to the work content, the operator's preference, and the like, and workability can be improved.

  According to the second aspect of the present invention, by operating the operating device and supplying the pilot pressure to the hydraulic pilot portion of each control valve, each actuator of the working device to which the bucket is attached is driven, and the working device is raised and lowered. Can be moved. When another work tool is attached to the work device instead of the bucket, the preliminary operation device is operated together with the operation device, and the pilot pressure is supplied to the hydraulic pilot portion of the control valve that controls the actuator of the other work tool. To do. Thereby, another working tool can be driven while the working device is moved up and down.

  Moreover, the pilot circuit that connects between the operating device and the control valve that controls the actuator of the bucket and the pilot circuit that connects between the preliminary operating device and the actuator of another work tool are switched to each other by the switching valve. Thus, other work tools can be operated with the operating device, and the bucket can be operated with the preliminary operating device.

  As a result, when the work is performed with another work tool instead of the bucket, the normal operation device and the preliminary operation device can be selected according to the work content, the operator's preference, and the like, and workability can be improved.

  According to the invention of claim 3, by operating the operating device and supplying the pilot pressure to the hydraulic pilot portion of each control valve, each actuator of the working device to which the bucket is attached is driven to raise and lower the working device. Can be moved. In addition, the upper swing body can be swung by driving the actuator of the swivel device.

  When another work tool is attached to the work device instead of the bucket, the preliminary operation device is operated together with the operation device, and the pilot pressure is supplied to the hydraulic pilot portion of the control valve that controls the actuator of the other work tool. To do. Thereby, another working tool can be driven while driving the working device and the turning device.

  Moreover, the pilot circuit that connects between the operating device and the control valve that controls the actuator of the bucket and the pilot circuit that connects between the preliminary operating device and the actuator of another work tool are exchanged with each other by the switching valve. By switching to, other work tools can be operated by the operating device, and the bucket can be operated by the preliminary operating device.

  As a result, when the work is performed with another work tool instead of the bucket, the normal operation device and the preliminary operation device can be selected according to the work content, the operator's preference, and the like, and workability can be improved.

  According to the invention of claim 4, the other work tool replacing the bucket can be manually operated by the operating device. As a result, for example, when a hydraulic grapple that opens and closes the fork with an actuator is attached to the distal end side of the working device, the fork can be opened and closed by manual operation, so that a delicate operation can be easily performed. Also, manual operation and stepping operation can be switched according to the operator's preference.

  According to the invention of claim 5, by switching the combination pattern of the operation pattern of the operating device and the control valve by the pattern switching valve, the operation mode can be changed more finely according to the preference of the operator, and the workability is improved. Can be improved.

  Hereinafter, as a construction machine applied to an embodiment of the present invention, a hydraulic excavator will be described as an example and described in detail with reference to the accompanying drawings. In the present embodiment, a case where a working device having a hydraulic grapple serving as another working tool on the tip side is used as an example instead of the working device having a bucket on the tip side will be described.

  First, FIG. 1 to FIG. 4 show a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a canopy-type hydraulic excavator as a construction machine applied to the first embodiment. The hydraulic excavator 1 includes a self-propelled lower traveling body 2 and a lower traveling body 2. An upper swing body 4 which is mounted so as to be capable of swinging via the swing device 3 and constitutes a vehicle body together with the lower traveling body 2, and a work device 5 which will be described later, which is provided on the front side of the upper swing body 4 so as to be able to move up and down. 6 is roughly constituted.

  5 is a bucket-type working device provided on the front side of the upper swing body 4 so as to be able to be lifted and lowered. The working device 5 includes a boom 5A attached to the front side of a swing frame 7 which will be described later and a boom 5A. An arm 5B attached to the tip of 5A so as to be able to move up and down, a bucket 5C attached to the tip of the arm 5B so as to be rotatable, a boom cylinder 5D that moves up and down the boom 5A, and the arm 5B The arm cylinder 5E that moves up and down and the bucket cylinder 5F that rotates the bucket 5C are roughly configured.

  Here, the excavator 1 can change the working device 5 to another form according to the work content. For example, when dismantling a building and transporting materials such as steel and wood at a construction site, a grapple specification working device 6 described later is generally used as shown in FIG.

  6 is a grapple specification work device provided on the front side of the upper swing body 4 in place of the bucket specification work device 5, and the work device 6 is mounted on the boom frame 7 so as to stand up on the front side of the swing frame 7. 6A, a boom 6B attached to the upper end of the boom mount 6A so as to be able to move up and down, an arm 6C attached to the tip of the boom 6B so as to be able to move up and down, and a pivot to the tip of the arm 6C Hydraulic grapple 6D as another work tool that can be attached, boom cylinder 5D used in bucket-type working device 5 that raises and lowers boom 6B, and arm used in working device 5 that raises and lowers arm 6C The cylinder 5E and a bucket cylinder 5F used in the working device 5 that rotates the hydraulic grapple 6D are roughly configured.

  Further, the hydraulic grapple 6D includes a pair of forks 6D1 that can be opened and closed on the tip side, and a fork cylinder 6D2 as a spare cylinder that opens and closes each fork 6D1.

  Further, as shown in FIGS. 1 to 3, the upper swing body 4 includes a swing frame 7 that forms a support structure, a driver seat 8 provided on the swing frame 7, and a rear side of the swing frame 7. A mounted engine (not shown), a hydraulic pump 9 driven by the engine, a hydraulic oil tank 10 for storing hydraulic oil to be supplied to the hydraulic pump 9, and a fuel tank (for storing fuel to be supplied to the engine) (Not shown) and a control valve 12, work levers 13 and 14, a spare pedal 15, a pilot circuit switching valve 17 and the like which will be described later.

  Reference numeral 11 denotes a main pipeline (see FIGS. 3 and 4) through which the pressure oil discharged from the hydraulic pump 9 flows. The main pipeline 11 includes the hydraulic pump 9, the turning motor 3A of the turning device 3, and the working devices 5 and 6. The common cylinders 5D, 5E, and 5F are connected to each other.

  Reference numerals 12A to 12E denote a plurality of control valves (referred to as each control valve 12 as a whole) disposed on the turning frame 7 in the middle of the main pipeline 11, and each control valve 12 is a hydraulic pilot spool valve. Is formed by. Here, each control valve 12 controls the swing control valve 12A for controlling the swing motor 3A of the swing device 3, the arm control valve 12B for controlling the arm cylinder 5E common to the work devices 5 and 6, and the boom cylinder 5D. Boom control valve 12C for controlling, bucket control valve 12D for controlling bucket cylinder 5F, and fork control valve 12E serving as a spare cylinder control valve for controlling fork cylinder 6D2 of hydraulic grapple 6D.

  The turning control valve 12A and the arm control valve 12B are connected to a hydraulic pilot valve 13A of the left working lever 13 whose hydraulic pilot portion will be described later. Further, the boom control valve 12C is connected to a hydraulic pilot valve 14A of the right working lever 14 described later. On the other hand, the bucket control valve 12D is connected to a hydraulic pilot valve 14A of the right working lever 14 or a hydraulic pilot valve 15A of the reserve pedal 15 by a pilot circuit switching valve 17 described later. Further, the fork control valve 12E is connected to a hydraulic pilot valve 15A of the reserve pedal 15 or a hydraulic pilot valve 14A of the right working lever 14 by a pilot circuit switching valve 17 so as to be switchable.

  Reference numeral 13 denotes a left working lever as an operating device disposed on the left side of the driver's seat 8. The left working lever 13 includes a pressure reducing valve type hydraulic pilot valve 13A and a lever 13B for manually operating the hydraulic pilot valve 13A. It is roughly constituted by. The left working lever 13 tilts the lever 13B to supply pilot pressure from the hydraulic pilot valve 13A to the hydraulic pilot part of the swing control valve 12A and the hydraulic pilot part of the arm control valve 12B. The common arm cylinder 5E is controlled by the swing motor 3A and the working devices 5 and 6.

  Reference numeral 14 denotes a right working lever as an operating device disposed on the right side of the driver's seat 8, and the right working lever 14 is substantially the same as the left working lever 13 and is a pressure reducing valve type hydraulic pilot valve 14A and lever 14B. It is roughly constituted by. The right working lever 14 controls the common boom cylinder 5D and bucket cylinder 5F in the working devices 5 and 6, or controls the boom cylinder 5D and the fork cylinder 6D2 of the hydraulic grapple 6D.

  Further, 15 is a reserve pedal as a reserve operation device disposed at the front of the driver's seat 8, and the reserve pedal 15 steps the pressure reducing valve type hydraulic pilot valve 15A and the hydraulic pilot valve 15A. The pedal 15B is roughly configured. The spare pedal 15 controls the fork cylinder 6D2 of the hydraulic grapple 6D or the bucket cylinder 5F common to the work devices 5 and 6.

  Reference numerals 16A to 16E denote pilot pipelines as pilot circuits provided as a pair of two connecting each control valve 12, the working levers 13 and 14, and the spare pedal 15 (referred to as each pilot pipeline 16 as a whole). Is shown.

  Here, each pilot pipe line 16 includes a pilot pipe line 16A connecting the hydraulic pilot valve 13A of the left working lever 13 and each pilot part of the turning control valve 12A, and the hydraulic pilot valve 13A of the left working lever 13 and arm control. Pilot pipe line 16B connecting each pilot part of valve 12B, pilot pipe line 16C connecting hydraulic pilot valve 14A of right working lever 14 and each pilot part of boom control valve 12C, and hydraulic pressure of right working lever 14 A pilot pipe line 16D connecting the pilot valve 14A and each pilot part of the bucket control valve 12D, and a pilot pipe line 16E connecting the hydraulic pilot valve 15A of the reserve pedal 15 and each pilot part of the fork control valve 12E. Has been.

  17 is a pilot circuit switching valve as switching means provided between the right working lever 14, the spare pedal 15, the bucket control valve 12D, and the fork control valve 12E. The pilot circuit switching valve 17 includes the right working lever 14, The connection of the pilot lines 16D and 16E between the reserve pedal 15 and the bucket control valve 12D and fork control valve 12E is switched so as to be exchanged with each other. The pilot circuit switching valve 17 is formed, for example, as a 4-port 2-position manual switching valve, and is disposed in the middle of the pilot pipelines 16D and 16E.

  The pilot circuit switching valve 17 connects the right working lever 14 and the bucket control valve 12D, and connects the spare pedal 15 and the fork control valve 12E at the switching position (a) shown in FIG. In this state, the hydraulic grapple 6D provided in the working device 6 can be rotated at the tip of the arm 6C by manually operating the right working lever 14. Further, the fork 6D1 of the hydraulic grapple 6D can be opened and closed by stepping on the spare pedal 15.

  Here, the hydraulic grapple 6D may not only grasp the scrap material of the dismantled building but also grip materials such as steel and wood at the construction site. In such a case, it is necessary to carefully perform opening / closing operations (force adjustment) of each fork 6D1 so as not to damage steel materials, wood, and the like. However, in the stepping operation, it is difficult to delicately operate each fork 6D1, and workability is lowered. In addition to the hydraulic grapple 6D that opens and closes each fork 6D1 using a fork cylinder 6D2 as a spare cylinder, there is a mechanical grapple (not shown) that opens and closes the fork by a bucket cylinder 5F. This mechanical grapple can be opened and closed by the right working lever 14.

  As described above, when the fork 6D1 of the hydraulic grapple 6D is delicately operated, or when an operator who is accustomed to the mechanical grapple operates the hydraulic grapple 6D, the lever 17A can be easily operated. By operating, the pilot circuit switching valve 17 is switched to the switching position (b) shown in FIG.

  In the state where the pilot circuit switching valve 17 is switched to the switching position (b), the right working lever 14 and the fork control valve 12E can be connected, and the spare pedal 15 and the bucket control valve 12D can be connected. Thereby, the operator can open and close each fork 6D1 of the hydraulic grapple 6D by manually operating the right working lever 14. Further, the hydraulic grapple 6D can be rotated at the tip of the arm 6C by stepping on the auxiliary pedal 15.

  Reference numeral 18 denotes a traveling lever / pedal provided on the front side of the driver's seat 8, and the traveling lever / pedal 18 causes the lower traveling body 2 to travel. Reference numeral 19 denotes a canopy provided on the turning frame 7 so as to cover the upper side of the driver's seat 8, and the canopy 19 is formed as a four-column canopy having columns at the front, rear, left and right.

  The hydraulic excavator 1 according to the first embodiment has the above-described configuration, and the operation thereof will be described below.

  First, the operator seated in the driver's seat 8 can drive the lower traveling body 2 by operating the traveling lever / pedal 18. Further, the operation devices 5 and 6 can be driven by operating the operation levers 13 and 14 and the like.

  Here, a case will be described in which the bucket-type work device 5 shown in FIG. 1 is operated in order to perform excavation work of earth and sand. In this case, the pilot circuit switching valve 17 is switched to the switching position (a) shown in FIG. As a result, the operator can turn the upper swing body 4 by operating the left work lever 13 to move the arm 5B of the work device 5 up and down. Further, by operating the right working lever 14, the boom 5A can be lifted and lowered, and the bucket 5C can be rotated. Thus, the excavation work of earth and sand etc. can be performed by operating the work apparatus 5 etc. with the left and right work levers 13 and 14.

  Next, for example, a case where the grapple specification working device 6 shown in FIG. 2 is operated at a building demolition site will be described. In this case, the operator can turn the upper swing body 4 by operating the left work lever 13 to move the arm 6C of the work device 6 up and down. Further, by operating the right working lever 14, the boom 6B can be lifted and lowered to rotate the hydraulic grapple 6D. Further, the fork 6D1 of the grapple 6D can be opened and closed by stepping on the spare pedal 15.

  In this way, by operating the working device 6 and the like by the left and right working levers 13 and 14 and the spare pedal 15, the building pillars and beams can be grasped and disassembled. At this time, since the hydraulic grapple 6D can be turned manually by operating the right working lever 14, the fork 6D1 can be finely aligned with the pillars, beams, etc. of the building, and efficiently. And dismantling work can be performed safely.

  Next, the case where the grapple specification working device 6 shown in FIG. 2 is used, for example, when conveying materials such as steel and wood at a construction site, or the case where an operator familiar with the mechanical grapple operates the hydraulic grapple 6D will be described. To do.

  In this case, the pilot circuit switching valve 17 is switched to the switching position (b) shown in FIG. As a result, the operator can turn the upper swing body 4 by operating the left work lever 13 to move the arm 6C of the work device 6 up and down. Further, by operating the right working lever 14, the boom 6B can be moved up and down, and the forks 6D1 of the hydraulic grapple 6D can be opened and closed. Furthermore, the grapple 6D can be rotated by stepping on the spare pedal 15.

  Thus, by operating the working device 6 and the like by the left and right working levers 13 and 14 and the spare pedal 15, materials such as steel and wood can be grasped and transported by the fork 6D1 of the hydraulic grapple 6D. In addition, since the fork 6D1 of the grapple 6D can be opened and closed by manual operation of the right working lever 14, the fork 6D1 can be opened and closed delicately and can be transported quickly without damaging the material.

  Thus, according to the first embodiment, when the grapple specification working device 6 is used to transport materials such as steel and wood, the pilot circuit switching valve 17 is switched to the switching position (b) shown in FIG. By switching to, the fork 6D1 of the hydraulic grapple 6D can be opened and closed with the right working lever 14 that can easily perform a delicate operation.

  As a result, it is possible to quickly carry materials and the like with the grapple specification working device 6 and improve workability. Moreover, an operator accustomed to the mechanical grapple can also operate the hydraulic grapple 6D by the same operation method as that of the mechanical grapple. In this respect, the workability can be improved.

  Next, FIG. 5 shows a second embodiment of the present invention. A feature of this embodiment is that a pattern switching valve is provided between the operating device and each control valve to switch a combination pattern of the operating pattern of the operating device and each control valve. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In FIG. 5, reference numeral 21 denotes a pattern switching valve provided between the left and right working levers 13 and 14 and each control valve 12. The pattern switching valve 21 has the left and right working levers 13 and 14 in front. The operation pattern when operated in the rearward direction, the left direction, and the right direction and the combination pattern of each control valve 12 are switched. The pattern switching valve 21 is disposed in the middle of each pilot pipe line 16, and in particular, the pilot pipe line 12 </ b> D is disposed between the right working lever 14 and the pilot circuit switching valve 17. The pattern switching valve 21 includes, for example, a valve main body 21A having a built-in direction switching valve (not shown), similar to those described in Japanese Utility Model Laid-Open Nos. 63-135004 and 2001-330004. The switching lever 21B for operating the direction switching valve in the valve main body 21A is roughly constituted.

  Thus, also in the second embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment described above. In particular, according to the second embodiment, the pattern switching valve 21 switches the operation pattern of the work levers 13 and 14 and the combination pattern of each control valve 12, thereby further finely controlling the operation mode according to the preference of the operator. Can be changed, and workability can be improved.

  In each of the embodiments, instead of the bucket-type working device 5, a working device 6 including a hydraulic grapple 6D as another working tool for opening and closing the fork 6D1 with the fork cylinder 6D2 is used as an example. I gave it as an explanation. However, the present invention is not limited to this, and the configuration may be such that only the bucket 5C is replaced with the hydraulic grapple 6D while the boom 5A, the arm 5B, etc. except the bucket 5C are left as they are.

  Moreover, in each embodiment, the hydraulic grapple 6D was mentioned as an example and demonstrated as another working tool. However, the present invention is not limited to this, and as another work tool, for example, a pressing machine that crushes concrete, asphalt, a breaker, a cutter that cuts a reinforcing bar, a clamshell bucket, a tamper, or the like may be used.

  On the other hand, in each of the embodiments, the left and right work levers 13 and 14 that are manually operated as the operation device are taken as an example, and the spare pedal 15 that is stepped on as the spare operation device is taken as an example. However, the present invention is not limited to this, and may be configured by a lever that manually operates both the operation device and the preliminary operation device, for example. Moreover, it is good also as a structure which is used as the pedal which carries out stepping operation of the operating device, and is used as the lever which operates a preliminary | backup operating device manually.

  In each of the embodiments, the canopy-spec hydraulic excavator 1 using the canopy 19 that covers the upper side of the driver's seat 8 has been described as an example. However, the present invention is not limited thereto. , Rear, left, right, and upper cab specification hydraulic excavator using a cab box may be applied.

  Furthermore, in each embodiment, the hydraulic excavator 1 in which the upper swing body 4 can be swung by the swivel device 3 is illustrated as a construction machine. However, the present invention is not limited to this, and can be widely applied to other construction machines such as a hydraulic excavator, a wheel loader, and a giraffe not provided with a turning device.

It is a front view which shows the hydraulic shovel provided with the working apparatus of the bucket specification applied to the 1st Embodiment of this invention. It is a front view showing a hydraulic excavator provided with a grapple specification working device applied to a 1st embodiment of the present invention. FIG. 3 is a hydraulic circuit diagram showing a state in which the pilot circuit switching valve is switched to a switching position (a). FIG. 3 is a hydraulic circuit diagram showing a state in which a pilot circuit switching valve is switched to a switching position (b). It is a hydraulic circuit diagram which shows the 2nd Embodiment of this invention.

Explanation of symbols

1 Hydraulic excavator (swivel construction machine)
2 Lower traveling body (car body)
3 Turning device 3A Turning motor (actuator)
4 Upper swing body (car body)
5 Bucket specification work device 5A, 6B Boom 5B, 6C Arm 5C Bucket 5D Boom cylinder (actuator)
5E Arm cylinder (actuator)
5F Bucket cylinder (actuator)
6 Grapple specification work device 6A Boom mount 6D Hydraulic grapple (other work tools)
6D1 fork 6D2 fork cylinder (actuator)
7 Swing frame 12A Swing control valve 12B Arm control valve 12C Boom control valve 12D Bucket control valve 12E Fork control valve (spare actuator control valve)
13 Left working lever (operating device)
14 Right work lever (operating device)
15 Spare pedal (preliminary operation device)
16A-16E Pilot pipeline (pilot circuit)
17 Pilot circuit switching valve (switching means)
21 Pattern switching valve

Claims (5)

A vehicle body, a working device provided at the front portion of the vehicle body so as to be able to move up and down, and capable of selectively attaching a bucket and another work tool to a front end side; a control valve provided on the vehicle body for controlling the work device; A construction machine comprising: an operating device used when operating the working device including the bucket; and a preliminary operating device used to operate the working tool when another working tool is attached to the working device. In
A construction machine comprising switching means for switching between the operation device and a control valve for controlling a bucket and between the preliminary operation device and a control valve for controlling another work tool. A vehicle body, a working device provided at the front portion of the vehicle body so as to be able to move up and down, and a bucket and other work tools can be selectively attached to the front end side, and pilot pressure is supplied to a hydraulic pilot portion provided in the vehicle body. A plurality of control valves for controlling the actuators of the working device including the bucket and the actuators of the other working tools, an operating device for operating the working device, and the like on the distal end side of the working device. In a construction machine comprising a preliminary operation device for operating the work tool when the work tool is attached,
Between the operation device and a control valve for controlling the actuator of the bucket, and between the preliminary operation device and a control valve for controlling the actuator of the other work implement, the two operation devices and two controls are provided. A construction machine comprising a switching valve for switching a pilot circuit to and from a valve. A lower traveling body, an upper revolving body mounted on the lower traveling body via a swivel device so as to be able to swivel, and a front part of the upper revolving body that can be lifted and lowered; A work device capable of selectively attaching tools,
The upper swing body has a plurality of controls for controlling each actuator of the work device including the bucket, the actuator of the swing device, and the actuator of the other work tool by supplying a pilot pressure to a hydraulic pilot portion. In a construction machine comprising a valve, an operation device that operates the work device and the turning device, and a preliminary operation device that operates the work tool when another work tool is attached to the distal end side of the work device,
Between the operation device and a control valve for controlling the actuator of the bucket, and between the preliminary operation device and a control valve for controlling the actuator of the other work implement, the two operation devices and two controls are provided. A construction machine comprising a switching valve for switching a pilot circuit to and from a valve.   The construction machine according to claim 1, 2 or 3, wherein the operating device is a manual lever operated by hand, and the preliminary operating device is a foot pedal operated by foot.   5. The construction according to claim 1, 2, 3, or 4, wherein a pattern switching valve that switches a combination pattern of the operation pattern of the operation device and the control valve is provided between the operation device and the control valve. machine.

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