JP2012166888A - Working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve working efficiency of a working machine provided with a rotary driving device rotatingly driving a drilling tool.SOLUTION: The working machine includes: a rotary driving device rotatingly driving the drilling tool; a first winch hoisting up the rotary driving device; a second winch pulling down the rotary driving device; and a combined operation device simultaneously instructing the winding up operation of the first winch and the winding down operation of the second winch, and the winding down operation of the first winch and the winding up operation of the second winch, with one combined operation member.

Description

  The present invention relates to a work machine including a rotation drive device that rotationally drives an excavator.

  In a work machine including a rotary drive device that rotationally drives an excavator such as an earth auger or casing, the rotary drive device is driven to rotate by, for example, a first winch that lifts the rotary drive device upward and a second winch that pulls the rotary drive device downward. Raise and lower the device. That is, the first winch and the second winch are respectively connected to the rotary drive device via the wire rope. In order to raise and lower the rotary drive device, it is necessary to drive the first winch and the second winch in synchronization so that the wire rope does not loosen or become too tight. At that time, it is necessary to operate the first winch and the second winch simultaneously with different operation levers, or to operate the operation lever of the other winch with one winch in a half-clutch state.

  When the first winch and the second winch are operated simultaneously with different operation levers, other operations cannot be performed. In addition, for example, when the excavator and the rotary drive device are moved downward, the first winch is placed in a half-clutch state, and when the second winch is operated, the downward pulling force by the second winch The excavator and the rotary drive device are moved downward by the weight of the excavator and the rotary drive device, and the excavator is pushed down toward the ground. As a winch used for such an application, for example, a winch described in the following patent document can be cited (see Patent Document 1).

JP 11-92087 A

  In construction using excavation equipment, it is necessary to frequently raise and lower the rotary drive device. Therefore, when using the half-clutch of the winch to raise and lower the rotary drive device, even if the winch described in the above-mentioned patent document is used, which winch is to be used as the half-clutch every time the rise and fall are switched. Must be changed. Further, when the ground is so soft that the excavator and the rotary drive device cannot hold their own weights, the excavator and the rotary drive device may not be able to hold their own weights when the first winch is in a half-clutch state.

  When simultaneously operating the first winch and the second winch with different operation levers, it is necessary to adjust the speed by operating the operation levers with both hands in order to raise and lower the rotation drive device. In order to perform the rotation speed adjustment and bucket lifting / lowering operation, the lifting / lowering operation of the rotary drive device has to be temporarily stopped, and the work efficiency is poor.

(1) A work machine according to the invention of claim 1 includes a rotary drive device that rotationally drives the excavator, a first winch that lifts the rotary drive device upward, and a second winch that pulls the rotary drive device downward, A hydraulic pump driven by a prime mover to supply pressure oil, a first winch motor that drives the first winch by pressure oil supplied from the hydraulic pump, and a second winch by pressure oil supplied from the hydraulic pump A second winch motor that drives the first winch motor, a first control valve that controls the flow of pressure oil supplied to the first winch motor, and a second control valve that controls the flow of pressure oil supplied to the second winch motor. 2 control valves and the first and second control valves to control the first winch winding operation and the second winch lowering operation. And a composite operation device capable of simultaneously instructing the operation of lowering the first winch and the operation of winding the second winch in accordance with the operation position of one composite operation member.
(2) According to a second aspect of the present invention, in the work machine according to the first aspect, the composite operating device has a first winch hoisting speed and a second winch lowering speed according to the operation position of the composite operating member. The first winch winding speed and the second winch winding speed can be independently specified according to the operation position of the composite operation member.
(3) The invention according to claim 3 is the work machine according to claim 1 or 2, wherein the combined operation device instructs the winding operation of the first winch and the winding operation of the second winch simultaneously. The first operation position of the composite operation member, the second operation position of the composite operation member for simultaneously instructing the lowering operation of the first winch and the winding operation of the second winch, and the winding operation of the first winch And a third operation position of the composite operation member for simultaneously instructing the winding operation of the second winch, and a composite operation member for instructing simultaneously the lowering operation of the first winch and the lowering operation of the second winch It is a device that can take four operation positions with the fourth operation position, and the composite operation device includes an operation blocking member that prevents the composite operation member from being operated to the third operation position and the fourth operation position. Have It is characterized by that.
(4) According to a fourth aspect of the present invention, in the work machine according to the first or second aspect, the combined operation device instructs the first winch winding operation and the second winch lowering operation simultaneously. The first operation position of the composite operation member, the second operation position of the composite operation member for simultaneously instructing the lowering operation of the first winch and the winding operation of the second winch, and the winding operation of the first winch And a third operation position of the composite operation member for simultaneously instructing the winding operation of the second winch, and a composite operation member for instructing simultaneously the lowering operation of the first winch and the lowering operation of the second winch The device can take four operation positions with the fourth operation position, and when the composite operation member is operated to the third operation position and the fourth operation position, driving of the first and second winches is prohibited. Driving prohibited A stopping means is further provided.
(5) According to the invention of claim 5, in the work machine according to any one of claims 1 to 4, the first winch hoisting and lowering operations are performed by the first winch operating member different from the composite operating member. A first operating device for instructing, a second operating device for instructing a second winch hoisting and lowering operation by a second winch operating member different from the composite operating member, and enabling the composite operating device, It is further characterized by further comprising an operation device selection means for alternatively selecting whether the first and second operation devices are valid.

  According to the present invention, the first winch unwinding operation and the second winch unwinding operation can be instructed simultaneously according to the operation position of one composite operation member, so that workability is improved.

It is an external view of construction machine 100 for foundation work which is an example of a working machine. 1 is a hydraulic circuit diagram showing a configuration of a construction machine 100 for foundation work. It is a figure explaining the operation direction of the operation lever 30e. It is a figure which shows a modification.

  With reference to FIGS. 1-4, one Embodiment of the working machine by this invention is described. FIG. 1 shows an external view of a construction machine for foundation work that is an example of a work machine to which the present invention is applied. The construction machine 100 for foundation work is a so-called three-point pile driver, a lower traveling body (running body) 1, and an upper revolving body (swivel body) 2 that is mounted on the traveling body 1 so as to be able to swivel. And a working device 3 for driving piles.

  The working device 3 is a casing as an excavating tool that is disposed on the front surface of the leader 4, a pair of backstays 5, a front surface of the leader 4, and provided with an excavating bit at the tip. 6 and a rotational drive device 7 for driving the casing 6. A leader bracket 9 that supports the leader 4 is attached to the front end of the revolving frame 8. A counterweight 10 is mounted on the rear end portion of the revolving frame 8, and a gantry (not shown) is attached to the rear of the counterweight 10. Devices such as a generator and a compressor (not shown) are mounted on the gantry. Near the rear end of the swivel frame 8, one rear jack 51 is attached to each of the left and right via a beam (not shown). In addition, a front jack 52 is attached to the leader bracket 9 one by one on the left and right via a beam (not shown).

  The revolving body 2 is equipped with a main winding winch 11 having a main winding drum 21 and an auxiliary winding winch 13 having an auxiliary winding drum 23. A main winding rope 14 is wound around the main winding drum 21. The main rope 14 is wound around a sheave 4 a at the upper part of the leader 4, a sheave 16 a provided at the pull-in attachment bracket 16 at the lower part of the leader 4, and a sheave 7 a provided at the lower part of the rotary drive device 7. ing. An auxiliary winding rope 15 is wound around the auxiliary winding drum 23. The auxiliary winding rope 15 is wound around sheaves 17 a and 17 b provided on the leader top 17 on the top of the leader 4 and a sheave 7 b provided on the top of the rotary drive device 7. When the main winding drum 21 and the auxiliary winding drum 23 are driven, the main winding rope 14 and the auxiliary winding rope 15 are wound or fed out, and the rotation driving device 7 moves up and down along the guide of the leader 4. The swivel body 2 is provided with a third winch (not shown). The third winch is used to suspend a bucket for putting sand into the casing 6. This bucket moves up and down along the guide on the side surface of the reader 4. The lifting / lowering operation of the bucket is performed simultaneously with the construction by the rotation drive device 7 and the casing 6 (during the lifting / lowering operation).

  In such a construction machine 100 for foundation work, different types of casings 6 are selected according to the construction depth and construction diameter, thereby changing the lengths of the leader 4 and the stay 5. As a result, the weight on the front side of the machine and the position of the center of gravity change. In addition, the weight of the machine and the position of the center of gravity change depending on equipment mounted on a gantry (not shown). For this reason, the weight of the counterweight 10 can be adjusted so as to keep the balance of the entire machine.

  FIG. 2 is a hydraulic circuit diagram showing a configuration of the construction machine 100 for foundation work. The hydraulic circuit includes a main pump 32 driven by an engine (not shown), a main winding winch motor 22 that is rotated by pressure oil supplied from the main pump 32, and a main winding drum driven by the main winding winch motor 22. 21 and a control valve (control valve) 25 for controlling the flow of pressure oil from the main pump 32 to the main winding winch motor 22 are provided.

  The hydraulic circuit includes a main pump 33 driven by an engine (not shown), an auxiliary winding winch motor 24 that is rotated by pressure oil supplied from the main pump 33, and an auxiliary winding winch motor 24 that is driven by the auxiliary winding winch motor 24. A winding drum 23 and a control valve (control valve) 26 for controlling the flow of pressure oil from the main pump 33 to the auxiliary winding winch motor 24 are provided. Reference numerals 22 a and 24 a are counter balance valves for the main winding winch motor 22 and the auxiliary winding winch motor 24.

  In this hydraulic circuit, an operating device (operating lever device) 28 for driving the control valve 25, an operating device (operating lever device) 29 for driving the control valve 26, and the control valves 25, 26 are driven. There are provided a composite operating device (operating lever device) 30 and a pilot pump 31 that is driven by an engine (not shown) and supplies pilot pressure oil. The operation lever device 28 includes an operation lever 28c and pilot valves 28a and 28b that generate a pilot pressure corresponding to the operation amount of the operation lever 28c. The operation lever device 29 includes an operation lever 29c and pilot valves 29a and 29b that generate a pilot pressure corresponding to the operation amount of the operation lever 29c. The operation lever device 30 includes an operation lever 30e and pilot valves 30a, 30b, 30c, and 30d that generate pilot pressure corresponding to the operation amount of the operation lever 30e. The pilot pump 31 supplies pilot pressure oil to the pilot valves 28a, 28b, 29a, 29b, 30a, 30b, 30c, and 30d.

  27a and 27b selectively supply pilot pressure oil from the pilot valves 28a and 28b or pressure oil from the pilot valves 30a and 30b to the upper and lower pilot ports of the control valve 25. This is an electromagnetic switching valve for switching. 27 c and 27 d selectively supply pilot pressure oil from the pilot valves 29 a and 29 b or pressure oil from the pilot valves 30 c and 30 d to the upper and lower pilot ports of the control valve 26. This is an electromagnetic switching valve for switching.

  When the solenoids of the electromagnetic switching valves 27a, 27b are not energized, the electromagnetic switching valves 27a, 27b connect the upper and lower pilot ports of the control valve 25 and the outlet ports of the pilot valves 28a, 28b for control. The upper and lower pilot ports of the valve 25 are shut off from the outlet ports of the pilot valves 30a and 30b. When the solenoids of the electromagnetic switching valves 27a and 27b are energized, the electromagnetic switching valves 27a and 27b shut off the upper and lower pilot ports of the control valve 25 and the outlet ports of the pilot valves 28a and 28b. The 25 upper and lower pilot ports are connected to the outlet ports of the pilot valves 30a and 30b.

  That is, when the solenoids of the electromagnetic switching valves 27a and 27b are not excited, the spool switching amount of the control valve 25 is controlled according to the operation amount of the operation lever 28c of the operation lever device 28. In this case, the operation of the operation lever 30e of the operation lever device 30 is invalid. When the solenoids of the electromagnetic switching valves 27a and 27b are excited, the switching amount of the spool of the control valve 25 is controlled according to the operation amount of the operation lever 30e of the operation lever device 30. In this case, the operation of the operation lever 28c of the operation lever device 28 is invalid.

  Similarly, when the solenoids of the electromagnetic switching valves 27c and 27d are not excited, the electromagnetic switching valves 27c and 27d connect the upper and lower pilot ports of the control valve 26 and the outlet ports of the pilot valves 29a and 29b. Then, the upper and lower pilot ports of the control valve 26 and the outlet ports of the pilot valves 30c and 30d are shut off. When the solenoids of the electromagnetic switching valves 27c and 27d are energized, the electromagnetic switching valves 27c and 27d shut off the upper and lower pilot ports of the control valve 26 and the outlet ports of the pilot valves 29a and 29b. The upper and lower pilot ports 26 are connected to the outlet ports of the pilot valves 30c and 30d.

  That is, when the solenoids of the electromagnetic switching valves 27c and 27d are not excited, the spool switching amount of the control valve 26 is controlled according to the operation amount of the operation lever 29c of the operation lever device 29. In this case, the operation of the operation lever 30e of the operation lever device 30 is invalid. When the solenoids of the electromagnetic switching valves 27c and 27d are excited, the switching amount of the spool of the control valve 26 is controlled according to the operation amount of the operation lever 30e of the operation lever device 30. In this case, the operation of the operation lever 29c of the operation lever device 29 is invalid.

  34a is an electromagnetic switching valve for connecting or blocking an oil passage connecting the outlet port of the pilot valve 30a and the electromagnetic switching valve 27a, and 35a is a pressure sensor for detecting the pressure of the pilot pressure oil from the pilot valve 30a. . 34b is an electromagnetic switching valve that connects or blocks an oil passage connecting the outlet port of the pilot valve 30b and the electromagnetic switching valve 27b, and 35b is a pressure sensor that detects the pressure of the pilot pressure oil from the pilot valve 30b. .

  34c is an electromagnetic switching valve that connects or blocks an oil passage connecting the outlet port of the pilot valve 30c and the electromagnetic switching valve 27c, and 35c is a pressure sensor that detects the pressure of the pilot pressure oil from the pilot valve 30c. . 34d is an electromagnetic switching valve that connects or blocks an oil passage connecting the outlet port of the pilot valve 30d and the electromagnetic switching valve 27d, and 35d is a pressure sensor that detects the pressure of the pilot pressure oil from the pilot valve 30d. .

  The controller 36 is a control circuit that controls each part of the foundation construction machine 100. In addition, in FIG. 2, a structure required regarding description of this Embodiment is shown in figure, and illustration about the structure regarding control of each part of the construction machine 100 for other foundation works is abbreviate | omitted. Connected to the controller 36 are electromagnetic switching valves 27a, 27b, 27c, 27d, electromagnetic switching valves 34a, 34b, 34c, 34d, pressure sensors 35a, 35b, 35c, 35d, and a lever switching switch 37. .

  As will be described later, the lever changeover switch 37 validates the operation of the operation levers 28c and 29c of the operation lever devices 28 and 29 and invalidates the operation of the operation lever 30e of the operation lever device 30 or controls the operation lever devices 28 and 29. It is a switch for selectively switching whether to invalidate the operation of the operation levers 28c and 29c and to enable the operation of the operation lever 30e of the operation lever device 30.

--- Relationship between switching position of lever changeover switch 37 and operation of each drum 21, 23 ---
In the present embodiment, when the lever changeover switch 37 is switched to the normal operation position, the operation of the operation levers 28c and 29c of the operation lever devices 28 and 29 is enabled and the operation of the operation lever 30e of the operation lever device 30 is disabled. . Specifically, when the lever switch 37 is switched to the normal operation position, the controller 36 de-energizes the solenoids of the electromagnetic switching valves 27a to 27d and de-energizes the solenoids of the electromagnetic switching valves 34a to 34d. . As a result, the rotation of the main winding drum 21 can be controlled by operating the operation lever 28 c of the operation lever device 28, and the rotation of the auxiliary winding drum 23 can be controlled by operating the operation lever 29 c of the operation lever device 29.

  When the lever changeover switch 37 is switched to the composite operation position, the controller 36 excites the solenoids of the electromagnetic switching valves 27a to 27d and excites the solenoids of the electromagnetic switching valves 34a to 34d. As a result, as will be described later, the rotation of the main winding drum 21 and the auxiliary winding drum 23 can be controlled by the operation of the operation lever 30e of the operation lever device 30.

--- About the operating lever device 30 ---
The operation lever device 30 is an operation device capable of operating the operation lever 30e in the front-rear and left-right directions as shown in FIG. The forward operation of the operation lever 30e corresponds to the lowering operation of the main winding drum 21, and the backward operation of the operation lever 30e corresponds to the winding operation of the main winding drum 21. That is, the pilot valves 30a and 30b generate pilot pressure according to the operation amount (operation position) of the operation lever 30e in the front-rear direction.

  The operation of the operation lever 30e in the right direction corresponds to the lowering operation of the auxiliary winding drum 23, and the operation of the operation lever 30e in the left direction corresponds to the operation of winding up the auxiliary winding drum 23. That is, the pilot valves 30c and 30d generate pilot pressure according to the operation amount (operation position) in the left-right direction of the operation lever 30e.

--- About the operation of the operating lever device 30 and the rotation of the drums 21, 23
Therefore, when the lever changeover switch 37 is switched to the composite operation position, the lowering and winding speeds of the main winding drum 21 change according to the operation amount of the operation lever 30e in the front-rear direction, and the auxiliary winding drum 23 The lowering and winding speeds change according to the amount of operation of the operation lever 30e in the left-right direction.

  When the lever changeover switch 37 is switched to the composite operation position, the operation of lowering the main winding drum 21 and the operation of winding the auxiliary winding drum 23 can be performed simultaneously by operating the operation lever 30e in the left front direction. At this time, the lowering speed of the main winding drum 21 and the winding speed of the auxiliary winding drum 23 can be adjusted independently by adjusting the amount of operation of the operation lever 30e in the front-rear and left-right directions. Similarly, when the lever switch 37 is switched to the composite operation position, if the operation lever 30e is operated in the rear right direction, the winding operation of the main winding drum 21 and the lowering operation of the auxiliary winding drum 23 are performed simultaneously. Can do. At this time, the hoisting speed of the main winding drum 21 and the lowering speed of the auxiliary winding drum 23 can be adjusted independently by adjusting the amount of operation of the operation lever 30e in the front-rear and left-right directions.

  Thereby, when the lever changeover switch 37 is switched to the composite operation position, if the operation lever 30e is operated in the left front direction, the rotation driving device 7 is raised along the guide of the reader 4, and the operation lever 30e is moved to the right rear. When operated in the direction, the rotary drive device 7 descends along the guide of the reader 4. In order to prevent the main winding rope 14 and the auxiliary winding rope 15 from being too tight or too slack, the operation amount of the operation lever 30e in the front-rear and left-right directions may be adjusted as appropriate.

  If the operation lever 30e is operated in the right front direction, the lowering operation of the main winding drum 21 and the lowering operation of the auxiliary winding drum 23 are performed simultaneously. If the operation lever 30e is operated in the left rear direction, the winding operation of the main winding drum 21 and the winding operation of the auxiliary winding drum 23 are performed simultaneously.

  Therefore, in the present embodiment, the controller 36 determines whether or not the operation lever 30e is operated in the right front direction or the left rear direction from the neutral position based on the pressure detected by the pressure sensors 35a, 35b, 35c, and 35d. That is, it is determined whether the operation position of the operation lever 30e is an inoperable area. When it is determined that the operation position of the operation lever 30e is an inoperable area, even when the lever changeover switch 37 is switched to the composite operation position, the controller 36 controls the electromagnetic switching valves 34a, 34b, 34c, The solenoid 34d is de-energized. As a result, the oil passages connecting the outlet ports of the pilot valves 30a, 30b, 30c, and 30d and the electromagnetic switching valves 27a, 27b, 27c, and 27d are blocked, and the rotation of the drums 21 and 23 is stopped.

  When it is detected that the operation lever 30e is operated from the neutral position to the left front direction or the right rear direction based on the pressure detected by the pressure sensors 35a, 35b, 35c, and 35d, that is, the operation lever 30e When it is detected that the operation position is an operable area, if the lever switch 37 is switched to the composite operation position, the controller 36 keeps the solenoids of the electromagnetic switching valves 34a, 34b, 34c, and 34d energized. To do.

The foundation construction machine 100 of the present embodiment has the following operational effects.
(1) The operation of winding up the main winding drum 21 and the operation of lowering the auxiliary winding drum 23, and the operation of lowering the main winding drum 21 and the operation of winding up the auxiliary winding drum 23 are simultaneously instructed by one operation lever 30e. It was configured to be possible. Thereby, since the operator can operate the two winches 11 and 13 simultaneously by operating the operation lever 30e with one hand, even if the ground is so soft that the weight of the casing 6 and the rotary drive device 7 cannot be held. Further, operations other than the lifting / lowering operation of the rotation driving device 7 (for example, the lifting / lowering operation of the bucket and the rotation speed adjusting operation of the casing 6) can be performed simultaneously with the lifting / lowering operation of the rotation driving device 7, thereby improving workability.

(2) The operating lever 30e can independently designate the winding speed of the main winding drum 21 and the lowering speed of the auxiliary winding drum 23, and the operating lever 30e can indicate the lowering speed of the main winding drum 21 and the auxiliary winding drum 23. It is possible to instruct the hoisting speed independently. Therefore, the rotary drive device 7 can be raised and lowered appropriately according to the state of the ground. That is, the operator can individually adjust the rotation speed of the main winding drum 21 and the rotation speed of the auxiliary winding drum 23 with the other hand while performing an operation other than the raising / lowering operation of the rotation driving device 7 with one hand. When the main winding drum 21 and the auxiliary winding drum 23 are operated by the separate operation levers 28c and 29c, it is difficult to finely adjust the degree of insertion of the respective levers. Although it is difficult to synchronize the speed 23 and problems such as rope slack and tension are likely to occur, the present embodiment can suppress the occurrence of such problems.

(3) As the operation lever device 30, an operation device capable of operating the operation lever 30e in the front-rear and left-right directions as shown in FIG. 3 is adopted. Thereby, simultaneous operation of the two winches 11 and 13 becomes easy.

(4) When it is detected that the operation position of the operation lever 30e is an inoperable area, the driving of the winches 11, 13 is prohibited. Thereby, the unwinding of the lowering of the main winding drum 21 and the lowering of the auxiliary winding drum 23 at the same time or the simultaneous lifting of the main winding drum 21 and the upper winding of the auxiliary winding drum 23 are performed. Can be prevented.

(5) The operation lever device 28 for controlling the rotation of the main winding drum 21, the operation lever device 29 for controlling the rotation of the auxiliary winding drum 23, and the rotation of the main winding drum 21 and the auxiliary winding drum 23 simultaneously. An operation lever device 30 for control is provided. Then, the operation of the operation levers 28c and 29c of the operation lever devices 28 and 29 is validated and the operation of the operation lever 30e of the operation lever device 30 is invalidated, or the operation levers 28c and 29c of the operation lever devices 28 and 29 are Whether the operation lever 30e of the operation lever device 30 is enabled or not can be selectively switched by the lever changeover switch 37. Thus, the operator can arbitrarily select the operation of the winch as before by the operation lever devices 28 and 29 and the operation of the two winches 11 and 13 by the single operation lever 30e by the operation lever device 30. Convenience is improved.

(6) When the main winding drum 21 and the auxiliary winding drum 23 are stopped, the counter balancing valve 24a of the auxiliary winding winch motor 24 prevents the auxiliary winding drum 23 from rotating in the feeding direction of the auxiliary winding rope 15. Therefore, the rotation drive device 7 and the casing 6 do not descend due to their own weight. Therefore, since it is not necessary to perform a special operation for preventing the rotation drive device 7 and the casing 6 from descending, efficient work can be performed. Further, even when the auxiliary winding drum 23 is operated in the lowering direction, the counterbalance valve 24a can be lowered while holding the own weight of the rotation driving device 7 and the casing 6, and the rotation driving device 7 and the casing 6 can be prevented from being lowered. Because there is no need for special operations, efficient work is possible.

---- Modified example ---
(1) In the above description, when it is detected that the operation position of the operation lever 30e is an inoperable area, the drums 21 and 23 are configured to stop rotating. However, the present invention is not limited to this. Not. For example, a member (blocking member) 30f that restricts the operating range of the operating lever 30e as shown in FIG. 4 is attached to the operating lever device 30 so that the operating lever 30e is prevented from being operated in the inoperable area. You may comprise.

(2) Although not particularly mentioned in the above description, when a rope slack detecting device for detecting slack in the rope is provided in the construction machine 100 for foundation work, a rope slack detecting device when slack occurs in the rope. Will give you an alarm. In addition, when the construction speed detection device for detecting the construction speed (the movement speed of the rotation drive device 7) is provided in the foundation construction machine 100, the operator can recognize the movement speed of the rotation drive device 7. An operator can recognize the presence or absence of slack in the rope by the presence or absence of an alarm issued by the rope slack detection device. Further, the operator can recognize whether or not the rope is too tight depending on whether or not the moving speed of the rotary drive device 7 has decreased. Accordingly, by using the rope slack detection device and the construction speed detection device, the operator can easily adjust the rotation speed of the main winding drum 21 and the rotation speed of the auxiliary winding drum 23 to be appropriate speeds.
(3) You may combine each embodiment and modification which were mentioned above, respectively.

  In addition, this invention is not limited to the thing of embodiment mentioned above at all, The rotation drive device which rotationally drives a drilling rig, the 1st winch which lifts a rotation drive device upwards, and pulls down a rotation drive device below A second winch, a hydraulic pump driven by a prime mover to supply pressure oil, a first winch motor that drives the first winch by pressure oil supplied from the hydraulic pump, and pressure supplied from the hydraulic pump A second winch motor that drives the second winch with oil, a first control valve that controls the flow of pressure oil supplied to the first winch motor, and pressure oil supplied to the second winch motor By controlling the second control valve for controlling the flow of the first and the first and second control valves, the winding operation of the first winch and the winding of the second winch are controlled. And a composite operation device capable of simultaneously instructing the lowering operation and the lowering operation of the first winch and the winding operation of the second winch according to the operation position of one composite operation member. It includes work machines with various structures.

1 Lower traveling body (traveling body) 2 Upper revolving body (revolving body)
3 Working device 4 Reader 6 Casing 7 Rotating drive device 11 Main winding winch 13 Supplementary winding winch 21 Main winding drum 22 Main winding winch motor 23 Supplementary winding drum 24 Supplementary winding winch motor 25, 26 Control valve (control valve)
27a, 27b, 27c, 27d Electromagnetic switching valves 28, 29 Operating device (operating lever device) 30 Compound operating device (operating lever device)
28a, 28b, 29a, 29b, 30a, 30b, 30c, 30d Pilot valve 28c, 29c, 30e Operation lever 30f Blocking member 31 Pilot pump 32, 33 Main pumps 34a, 34b, 34c, 34d Electromagnetic switching valves 35a, 35b, 35c , 35d Pressure sensor 37 Lever changeover switch 100 Construction machine for foundation work

Claims (5)

A rotational drive device for rotationally driving the excavator;
A first winch that lifts the rotary drive device upward;
A second winch that pulls down the rotary drive device;
A hydraulic pump driven by a prime mover to supply pressure oil;
A first winch motor that drives the first winch with pressure oil supplied from the hydraulic pump;
A second winch motor that drives the second winch with pressure oil supplied from the hydraulic pump;
A first control valve for controlling a flow of pressure oil supplied to the first winch motor;
A second control valve for controlling the flow of pressure oil supplied to the second winch motor;
By controlling the first and second control valves, the winding operation of the first winch and the winding operation of the second winch, and the winding operation of the first winch and the first A work machine comprising: a composite operation device capable of simultaneously instructing a winch winding operation of two winches in accordance with an operation position of one composite operation member. The work machine according to claim 1,
The composite operation device can independently indicate the winding speed of the first winch and the winding speed of the second winch according to the operation position of the composite operation member, and the operation of the composite operation member A work machine characterized in that the first winch lowering speed and the second winch lowering speed can be independently indicated according to the position. In the work machine according to claim 1 or 2,
The composite operation device includes a first operation position of the composite operation member for simultaneously instructing a winding operation of the first winch and a winding operation of the second winch, and a winding operation of the first winch. And the second operation position of the composite operation member for simultaneously instructing the winding operation of the second winch, and the composite for simultaneously instructing the winding operation of the first winch and the winding operation of the second winch. Four operation positions including a third operation position of the operation member and a fourth operation position of the composite operation member that simultaneously instructs the lowering operation of the first winch and the lowering operation of the second winch. It is a device that can take
The composite operating device includes an operation blocking member that prevents the composite operating member from being operated to the third operation position and the fourth operation position. In the work machine according to claim 1 or 2,
The composite operation device includes a first operation position of the composite operation member for simultaneously instructing a winding operation of the first winch and a winding operation of the second winch, and a winding operation of the first winch. And the second operation position of the composite operation member for simultaneously instructing the winding operation of the second winch, and the composite for simultaneously instructing the winding operation of the first winch and the winding operation of the second winch. Four operation positions including a third operation position of the operation member and a fourth operation position of the composite operation member that simultaneously instructs the lowering operation of the first winch and the lowering operation of the second winch. It is a device that can take
A work machine further comprising drive prohibiting means for prohibiting driving of the first and second winches when the composite operation member is operated to the third operation position and the fourth operation position. . In the work machine according to any one of claims 1 to 4,
A first operating device for instructing the first winch hoisting and lowering operations by a first winch operating member different from the composite operating member;
A second operating device for instructing the second winch hoisting and lowering operation by a second winch operating member different from the composite operating member;
A work machine, further comprising: an operation device selection unit that selectively selects whether the composite operation device is enabled or whether the first and second operation devices are enabled.

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