JP2012085543A - Tree treatment machine - Google Patents

Abstract

In a tree processing machine using an electromagnetic switching valve as a pilot valve of a hydraulic actuator control valve for a bark peeling attachment, it is possible to control the hydraulic actuator at a very low speed and improve workability. Provide a processing machine.
A control valve for a hydraulic cylinder that opens and closes a gripping claw and a pilot valve that switches between electromagnetic switching valves 40, 41, 42, and 43 of a turning device for a bark peeling attachment according to the amount of operation. A manually operated pilot valve that changes the secondary pilot hydraulic pressure. By operating these manually operated pilot valves, the pilot pressure oil appearing in the secondary circuit of these pilot valves is added to the operation chamber 32a of the flow rate adjusting valve 32 to adjust the hydraulic oil flow rate to the control valves 35 and 36. .
[Selection] Figure 3

Description

  The present invention relates to a tree processing machine configured by attaching a tree processing attachment to the tip of a working arm of a self-propelled working machine.

  There exists a thing of patent document 1 as this kind of conventional tree processing machines. This conventional tree processing machine is configured by attaching a tree processing attachment for gripping and cutting a tree to the tip of a working arm of a self-propelled working machine. The tree processing attachment includes a bracket rotatably attached to the tip of the working arm, a turning device attached to the bracket, and a pair of holding claws for holding a tree attached to the turning body of the turning device. A cutting saw for cutting the tree attached to one end of the gripping claw, a saw feed device for adjusting the cutting position by moving the cutting saw in the longitudinal direction of the tree, and the like.

  In this conventional tree processing machine, hydraulic actuators (hydraulic cylinders or hydraulic motors) are used for any of the turning device, gripping claw opening / closing device, cut saw drive device, and saw feed device provided in the tree processing attachment. An electromagnetic switching valve is used as a pilot valve of a control valve that controls these hydraulic actuators. In a tree processing machine using this electromagnetic switching valve, the energization of the solenoid of the electromagnetic switching valve is controlled by operating a switch provided for each hydraulic actuator. This controls the supply of pilot pressure oil to the control chamber of the control valve, thereby switching the control valve and switching the supply of hydraulic oil from the hydraulic pump mounted on the self-propelled work machine body to the hydraulic actuator. Thus, the cutting operation of the tree is performed by turning, opening and closing the gripping claws, approaching and separating the cutting saw from the tree, and driving the cutting saw.

JP-A-6-71606

  The conventional tree processing machine uses a switch as described above as means for operating the hydraulic actuator of the tree processing attachment, and switches the electromagnetic switching valve by this switch operation, thereby operating the control valve. For this reason, in the control valve, the flow rate of the hydraulic oil cannot be controlled and the fine speed control cannot be performed. In this way, since fine speed control cannot be performed, if gripping is difficult unless the orientation and position of the gripping claw is set accurately, the orientation and position of the gripping claw may not be set accurately and the tree may not be gripped in a proper manner. .

  In view of the above-mentioned problems, the present invention enables a fine speed control of a hydraulic actuator in a tree processing machine using an electromagnetic switching valve for switching a control valve for a hydraulic actuator of a bark peeling attachment, thereby improving workability. An object of the present invention is to provide a tree processing machine that can be used.

The tree processing machine according to claim 1 is configured by attaching a tree processing attachment to a tip of a working arm of a self-propelled working machine,
The tree treatment attachment includes a bracket rotatably attached to a tip of the working arm, a turning device attached to the bracket and having a hydraulic motor, and attached to a turning body of the turning device. Saw comprising a pair of gripping claws for opening and closing a tree, a cutting saw for cutting a tree attached to one end of the revolving body and driven by a hydraulic motor, and a hydraulic cylinder for moving or retracting the cutting saw toward the tree A feed device, a control valve for controlling each of the hydraulic motor and the hydraulic cylinder, an electromagnetic switching valve corresponding to each control valve for switching each control valve, and a solenoid and a power source of each electromagnetic switching valve In a tree processing machine provided with a switch for operating the electromagnetic switching valve,
A flow rate adjusting valve provided between the control valve and a main hydraulic pump provided in the self-propelled working machine body, the flow rate of which is controlled by the level of pilot pressure oil applied to the operation chamber;
Provided as an electromagnetic switching valve for switching the control valve for the hydraulic motor of the swivel device and the switch for operating the electromagnetic switching valve for switching the control valve of the hydraulic cylinder for opening and closing the gripping claws, respectively, by the pilot pressure oil acting Close pressure switch,
As the pilot valve for the hydraulic motor of the swivel device and the pilot valve for the hydraulic cylinder that opens and closes the gripping claws, the pilot hydraulic pump provided in the self-propelled work machine body and the pressure switches are provided, respectively. A manually operated pilot valve for a hydraulic motor of the swivel device having an operation lever or an operation pedal for switching a pilot pressure oil applied to each pressure switch from the pilot hydraulic pump, the secondary pilot hydraulic pressure changing according to the amount And a manually operated pilot valve for a hydraulic cylinder for opening and closing the gripping claws,
By adjusting the manually operated pilot valve for the hydraulic motor of the swivel device or the manually operated pilot valve for the hydraulic cylinder for opening and closing the gripping claw, the pilot pressure oil appearing in the secondary side circuit of these pilot valves is adjusted in the flow rate. And a high-pressure selection circuit applied to the operation chamber of the valve.

The tree processing machine according to claim 2 is the tree processing machine according to claim 1,
As the flow rate adjusting valve, a preliminary control valve provided in the main body of the self-propelled working machine is used.

  According to the first aspect of the present invention, when the manually operated pilot valve for operating the hydraulic motor of the turning device of the tree processing attachment or the manually operated pilot valve of the hydraulic cylinder for opening and closing the gripping claws is operated, these pilots are simultaneously operated. The corresponding pressure switch is actuated by the pilot hydraulic pressure generated in the secondary circuit of the valve, and the hydraulic motor control valve or the hydraulic cylinder control valve is switched. At the same time, pilot pressure oil appearing on the secondary side of these manually operated pilot valves is added to the operation chambers of the flow rate adjustment valves via the high pressure selection circuit, and the flow rate adjustment valves are pilots corresponding to the operation amounts of these pilot valves. The hydraulic fluid adjusted to the flow rate corresponding to the hydraulic pressure is supplied to the hydraulic motor of the swing device and the hydraulic cylinder for opening and closing the gripping claw through the control valve.

  For this reason, it becomes possible to operate the hydraulic motor of the turning device and the hydraulic cylinder for opening and closing the gripping claw at a speed corresponding to the operation amount of the corresponding pilot valve, and fine speed control is possible. For this reason, by reducing the amount of operation of these operating levers or operating pedals, it is possible to set the turning position and open / close operation at a fine operating speed of the gripping claw, and to accurately set the direction of the gripping claw and the gripping operation. It is possible to perform well, and even trees that are difficult to grasp can be grasped, and workability is improved.

  According to the second aspect of the present invention, since the spare control valve provided with the self-propelled working machine is used as the flow rate adjusting valve, the slow speed control can be performed without adding a new valve as the flow rate adjusting valve. A simple tree processing machine can be realized.

It is a side view which shows one Embodiment of the tree processing machine of this invention. It is a side view which shows the tree processing attachment of the tree processing machine of this Embodiment. It is an example figure of the electrohydraulic circuit of the tree processing machine of this Embodiment. It is an electrohydraulic circuit diagram explaining the connection relationship between the operating device of the present embodiment and the solenoid of the electromagnetic switching valve. It is an electrohydraulic circuit diagram explaining the connection relationship between the operating device of the present embodiment and the flow rate adjustment valve.

  FIG. 1 is a side view showing an embodiment of a tree processing machine according to the present invention. This tree processing machine includes a self-propelled work machine body 1 using a hydraulic excavator as a base machine, a multi-joint work arm 2 provided in the self-propelled work machine body 1, and a tip of the work arm 2. It consists of a tree processing attachment 3 attached. The self-propelled working machine body 1 includes a crawler type lower traveling body 4, an upper revolving body 6 installed on the lower traveling body 4 via a revolving device 5, and a cab 7 mounted on the upper revolving body 6. And a hydraulic power unit 8.

  The working arm 2 includes a boom 11 attached to the upper swing body 6 by a hydraulic cylinder 10 so as to be raised and lowered, an arm 13 attached to the tip of the boom 11 so as to be rotatable by a hydraulic cylinder 12, and a tree processing attachment 3. A hydraulic cylinder 14 for rotation, and links 15 and 16 for expanding the rotation angle respectively attached between the hydraulic cylinder 14 and the arm 13 and the tree processing attachment 3 are provided.

  As shown in the side views of FIGS. 1 and 2, the tree processing attachment 3 includes a bracket 19 that is rotatably connected to the tip of the arm 13 and the link 16 by pins 17 and 18, and the bracket 19. A swiveling device 20 that is mounted and swivels the swiveling body 20b by a hydraulic motor 20a, and a tree gripper that is attached to the swiveling body 20b of the swiveling device 20 and that is opened and closed around pins 22 and 22 by a hydraulic cylinder for clamping (not shown). And a pair of gripping claws 23, 23. A cut saw 25 made of a chain saw is attached to one end in the axial direction of the tree 24 of one swivel body 20b so as to be rotatable about a pin 26. Reference numeral 25a denotes a hydraulic motor that rotationally drives the cutting saw 25.

  The tree processing attachment 3 adjusts the direction of the gripping claws 23 by the operation of the turning hydraulic motor 20a, and rotates the gripping claws 23 in the closing direction as indicated by an arrow R1 by a clamping hydraulic cylinder (not shown). Next, the cutting saw 25 is rotated by a cutting saw driving hydraulic motor 25a, and the cutting saw 25 is rotated as shown by an arrow R2 by a saw feed hydraulic cylinder (not shown) to apply the cutting saw 25 to the tree 24. And cut. A saw adjusting hydraulic cylinder that moves the cutting saw 25 in the longitudinal direction of the tree 24 and adjusts the cutting position of the tree 24 by the cutting saw 25 is provided, but the illustration is omitted.

  FIG. 3 is a diagram showing a hydraulic circuit that drives and controls a hydraulic actuator provided in the tree processing attachment 3. In FIG. 3, 20 a is a turning hydraulic motor of the turning device 20, 21 is a clamping hydraulic cylinder that opens and closes the gripping claws 23, 25 a is a cutting saw driving hydraulic motor that rotationally drives the cutting saw 25, and 27 is a cutting position of the cutting saw 25. A saw-feed hydraulic cylinder 28 that is retracted from the rotational or cutting position, and a saw-adjust hydraulic cylinder 28 that adjusts the longitudinal position of the tree 24 of the cut saw 25.

  29 is a main hydraulic pump provided in the hydraulic power unit 8, 30 is an oil tank, and 31 is a relief valve for setting the maximum pressure of hydraulic oil discharged from the main hydraulic pump 29. Reference numeral 32 denotes a flow rate adjusting valve used for adjusting the flow rate of hydraulic oil. In this embodiment, a preliminary control valve is used as the flow rate adjusting valve 32. The spare control valve is preliminarily arranged in parallel with control valves for hydraulic actuators (hydraulic cylinders 10, 12, 14) for operating the traveling motor, the swing motor, and the working arm 2 provided in the work machine body 1. It is what. The flow rate adjustment valve 32 is capable of adjusting the hydraulic oil flow rate according to the level of pilot pressure applied to the operation chamber 32a. Reference numeral 33 denotes an operating device including the flow rate adjusting valve 32 and pilot valves 86 to 89 (see FIGS. 4 and 5) for switching the electromagnetic switching valves 40 to 46 described later.

  35 is a control valve for the clamping hydraulic cylinder 21 that opens and closes the gripping claws 23, 36 is a control valve for the turning hydraulic motor 20a of the turning device 20, 37 is a control valve for the hydraulic motor 25a that drives the cutting saw 25, and 38 is cutting saw. This is a control valve for the hydraulic cylinder 28 for saw adjustment that adjusts the longitudinal position of the 25 trees 24.

  40 and 41 are electromagnetic switching valves for controlling the supply of pilot pressure oil to the operation chamber of the control valve 35. Similarly, electromagnetic switching valves 42 and 43, 44, 45 and 46 are provided for the control valves 36, 37 and 38, respectively. 40a to 46a are solenoids of the electromagnetic switching valves 40 to 46, respectively.

  In FIG. 3, 20c shows the center joint (rotary joint) in the turning apparatus 20 with which the tree processing attachment 3 was equipped, The hydraulic pipe line between the control valves 35-38, the hydraulic motor 25a, and the hydraulic cylinders 21, 27, 28 Are connected.

  50 and 51 are hydraulic lines connected to the hydraulic cylinder 21 for clamping, and hydraulic oil is supplied when the gripping claws 23 are closed and opened, respectively. A tank conduit 52 is connected to the clamping hydraulic cylinder 21. Reference numerals 53 and 54 denote throttle valves. These throttle valves 53 and 54 are provided between the opening and closing hydraulic lines 50 and 51 connected to the clamping hydraulic cylinder 21 and the tank line 52, and the control valve 35. Is switched to the neutral position, the hydraulic oil in the hydraulic lines 50 and 51 is caused to flow through the tank line 52 to eliminate the operating oil pressure. Reference numerals 55 and 56 denote pilot check valves that prevent the hydraulic fluid from flowing to the hydraulic cylinder 21 after the hydraulic pressure in the hydraulic pipes 50 and 51 is lost, thereby preventing expansion and contraction. 57 and 58 are relief valves for preventing the hydraulic pressure of the hydraulic pipes 50 and 51 from becoming excessive.

  Reference numerals 60 and 61 denote hydraulic lines for supplying hydraulic oil to the turning hydraulic motor 20a. 62 and 63 are relief valves for preventing the oil pressure of these hydraulic pipes 60 and 61 from becoming excessive. Reference numeral 64 denotes a counter balance valve. The counter balance valve 64 includes a switching valve 64a and check valves 64b and 64c. The counter balance valve 64 prevents the turning speed from changing depending on the turning direction as much as possible due to the weight of the part below the turning body 20b in the tree processing attachment 3 and the load of the tree 24.

  Reference numerals 66 and 67 denote hydraulic conduits for supplying and discharging hydraulic oil to and from the cutting saw 25 driving hydraulic motor 25a. A throttle valve 68 is provided in the hydraulic line 67 for returning the hydraulic oil from the hydraulic motor 25 a to the oil tank 30. The throttle valve 68 generates a hydraulic pressure for expanding and contracting the saw feed hydraulic cylinder 27. In addition, although the drain line which returns drain to the oil tank 30 is connected to the hydraulic motors 20a and 25a, illustration is abbreviate | omitted.

  A hydraulic line 70 for supplying hydraulic oil to the saw feed hydraulic cylinder 27 is provided to branch from between the hydraulic oil outlet of the cut-saw drive hydraulic motor 25 a and the throttle valve 68. The hydraulic line 71 through which the hydraulic oil discharged from the hydraulic cylinder 27 flows is connected to a return hydraulic line 67 to the oil tank 30 of the cut-saw hydraulic motor 25a. A control valve 73 is provided in these hydraulic lines 70 and 71 and controls expansion and contraction of the saw feed hydraulic cylinder 27. The control valve 73 is electromagnetically operated, and the solenoids 73a and 73b are connected to a wiring (not shown) connected to a switch (not shown) provided in the cab 7 via a center joint 20c. 74 and 75 are pilot check valves that prevent the hydraulic oil from flowing to the hydraulic cylinder 27 due to the loss of the hydraulic pressure in the hydraulic lines 70 and 71 to prevent the expansion and contraction thereof.

  Reference numerals 77 and 78 denote hydraulic conduits for supplying and discharging hydraulic oil to and from the saw adjust hydraulic cylinder 28. Reference numerals 79 and 80 are pilot check valves that prevent the hydraulic oil from flowing into the hydraulic cylinders 28 due to the loss of hydraulic pressure in the hydraulic lines 77 and 78, thereby preventing the expansion and contraction thereof. Reference numeral 81 denotes a throttle valve that limits the expansion / contraction speed of the hydraulic cylinder 28.

  FIG. 4 is an electrohydraulic circuit diagram illustrating the connection relationship between the operating device 33 and the solenoids 40a to 46a of the electromagnetic switching valves 40 to 46. 83 is a pilot hydraulic pump provided in the hydraulic power unit 8, and 84 is a battery. A relief valve 85 sets the maximum pressure of the discharge hydraulic pressure of the pilot hydraulic pump 83. Reference numerals 86 and 87 denote pedal-operated pilot valves provided in the cab 7 as manpower-operated pilot valves, which operate the clamping hydraulic cylinder 21 and the turning hydraulic motor 20a, respectively. Reference numerals 88 and 89 are pilot valves with operating levers provided in the cab 7 and operate the cut-saw hydraulic motor 25a and the saw-adjust hydraulic cylinder 28, respectively. 90 and 91 are pressure switches for detecting the operation of the pilot valve 86, 92 and 93 are pressure switches for detecting the operation of the pilot valve 87, 94 is a pressure switch for detecting the operation of the pilot valve 88, and 95 and 96 are pilot valves 89. It is a pressure switch that detects the operation of. The pressure switches 90 to 96 are respectively provided between the battery 84 and the solenoids 40a to 46a of the electromagnetic switching valves 40 to 46. When the pressure switches 90 to 96 are closed, the corresponding solenoids 40a to 46a are energized, and the corresponding electromagnetic switches are provided. The switching valves 40 to 46 are configured to switch.

  FIG. 5 is an electrohydraulic circuit diagram illustrating a connection relationship between the operating device 33 including the pilot valves 86 to 89 and the flow rate adjusting valve 32. In FIG. 5, 97 is a shuttle valve that derives the secondary pilot pressure oil when the pilot valve 86 is operated, and 98 is the secondary pilot pressure oil that is derived when the pilot valve 87 is operated. The shuttle valve 99 is a shuttle valve that selects and derives the high pressure side of these shuttle valves 97 and 98.

  101 is a pressure switch that closes when the pilot valve 88 is operated, and 102 and 103 are pressure switches that close when the pilot valve 89 is operated. Reference numeral 104 denotes an electromagnetic switching valve that is energized from the battery 84 to the solenoid 104a and switches from the right position to the left communication position when any of these pressure switches 101 to 103 is closed. 100 is a shuttle valve that selects the high pressure side of the pilot pressure oil derived from the shuttle valve 99 and the pilot pressure oil supplied via the electromagnetic switching valve 104 and supplies it to the operation chamber 32a of the flow rate adjustment valve 32. is there.

  In this configuration, when the pedal 86a of the pilot valve 86 shown in FIG. 5 is operated in the direction of the arrow a1 or a2, pilot pressure oil from the pilot hydraulic pump 83 operates the flow rate adjustment valve 32 through the shuttle valves 97, 99, 100. Supplyed to the chamber 32a, the flow rate adjustment valve 32 is switched to the left position.

  At the same time, in FIG. 4, the pressure switch 90 or 91 is closed, and the solenoid 84 a of the electromagnetic switching valve 40 or the solenoid 41 a of the electromagnetic switching valve 41 is energized from the battery 84. As a result, in FIG. 3, the pilot valve 40 is switched to the left position, or the pilot valve 41 is switched to the right position. As a result, the oil discharged from the main hydraulic pump 29 is added to the left or right operation chamber of the control valve 35 through the flow rate adjustment valve 32, the hydraulic line 105, and the electromagnetic switching valve 40 or 41. As a result, the control valve 35 is switched to the left position or the right position, the clamping hydraulic cylinder 21 contracts or extends, and the gripping claws 23 operate in the opening direction or the closing direction. Here, the flow rate adjusting valve 32 causes the hydraulic pressure of the pilot pressure oil applied to the operation chamber 32 a, that is, the hydraulic oil corresponding to the operation amount of the pedal 86 a to flow to the clamping hydraulic cylinder 21 through the control valve 35.

  Thus, when a tree is gripped by the expansion and contraction of the hydraulic cylinder 21 for clamping, the flow rate of the hydraulic oil passing through the flow rate adjustment valve 32 is adjusted by adjusting the operation amount of the pedal 86a, and the hydraulic cylinder 21 for clamping is adjusted. Can be supplied to. For this reason, the gripping claw 23 can be closed at a low speed by reducing the operation amount of the pedal 86a.

If the pedal 87a of the pilot valve 87 is operated to b1 or b2 in FIG.
Pilot pressure oil is added to the operation chamber 32 of the flow rate adjusting valve 32 through the shuttle valves 98, 99, 100, and at the same time, the pressure switch 92 or 93 in FIG. 4 is closed, and the solenoid 42a of the electromagnetic switching valve 42 or the solenoid 43a of the electromagnetic switching valve 43. The electromagnetic switching valve 42 is switched to the left position or the electromagnetic switching valve 43 is switched to the right position, and the control valve 36 is switched to the left position or the right position. For this reason, since the turning hydraulic motor 20a rotates at a speed corresponding to the operation amount of the pedal 87a, the gripping claws 23, 23 can be turned at a low speed by reducing the operation amount of the pedal 87a.

  As described above, when the gripping claws 23 are turned or when the trees 24 are gripped by the gripping claws 23, the operation amount of the pedals 86a and 87a can be reduced so that the turning and gripping operations can be performed at a low speed. This fine speed control enables the direction setting and gripping operation of the gripping claws to be performed accurately, and even trees that are difficult to grip can be gripped. improves

  On the other hand, fine speed control is not performed for hydraulic actuators that do not require fine speed control. That is, when operating the hydraulic motor 25a for the cut saw 25, if the operation lever 88a of the pilot valve 88 is operated as shown by the arrow c1 in FIG. 4, the pressure switch 94 is closed and the solenoid 44a is energized. Since the electromagnetic switching valve 44 is switched to the right position and the control valve 37 is switched, the hydraulic motor 25a is rotationally driven. At the same time, in FIG. 5, the pressure switch 101 is closed and the electromagnetic switching valve 104 is switched to the left position, and a constant pressure of pilot pressure oil from the pilot hydraulic pump 83 is added to the operation chamber of the flow rate adjusting valve 32. The flow rate of the hydraulic fluid flowing through 32 is constant. For this reason, the hydraulic motor 25a rotates at a constant speed.

  In this state where the hydraulic motor 25a is rotating, the hydraulic pressure in the hydraulic line 70 becomes higher than the tank pressure by the throttle valve 68 in FIG. 3, and the electromagnetically operated control valve 73 is switched to switch the saw feed hydraulic cylinder 27. Can be expanded and contracted. When the saw adjusting hydraulic cylinder 28 is operated after the tree 24 is gripped to adjust the cutting position by the cut saw 25, the operation lever 89a of the pilot valve 89 is operated in the direction d1 or d2 in FIGS. To do. Accordingly, the pressure switch 95 or 96 is closed, the electromagnetic switching valve 45 or 46 is switched, and at the same time the pressure switch 102 or 103 is closed, so that the cut saw 25 can be moved in the longitudinal direction of the tree 24 at a constant speed.

  When carrying out the present invention, the flow rate adjustment valve 32 can be added in addition to the control valve provided in advance of the hydraulic excavator body which is a self-propelled working machine body, but in the present embodiment, Since the spare control valve normally provided in the hydraulic excavator body is used as the flow rate adjustment valve 32, it is possible to realize a tree processing machine capable of the fine speed control without adding a new valve as the flow rate adjustment valve.

  In the above embodiment, the fine speed control can be performed even when the gripping claw 23 is opened. However, the slow speed control may be performed only when the gripping claw 23 is closed. Further, as the manpower operated pilot valves 86 and 87, levers may be used instead of pedals. Further, the control valve 70 for operating the cutting saw 25 between the cutting position and the retracted position may be hydraulically operated instead of electromagnetically operated. Further, the tree processing machine to which the present invention is applied may have a pruning machine or a pruning function, and is provided with a function of feeding a tree in its longitudinal direction while holding the tree with the holding claws 23. It may be.

1: self-propelled working machine main body, 2: working arm, 3: wood processing attachment, 4: crawler type lower traveling body, 5: turning device, 6: upper turning body, 7: cab, 8: hydraulic power unit, 10: hydraulic cylinder, 11: boom, 12: hydraulic cylinder, 13: arm, 14: hydraulic cylinder, 15, 16: link, 19: bracket, 20: turning device, 20a: turning hydraulic motor, 20b: turning body, 20c: Center joint, 21: Clamping hydraulic cylinder, 22: Pin, 23: Holding claw, 24: Tree, 25: Cut saw, 25a: Cut saw drive hydraulic motor, 26: Saw feed hydraulic cylinder, 28: Saw adjust Hydraulic cylinder, 29: main hydraulic pump, 30: oil tank, 31: relief valve, 32: flow adjustment valve, 33: operating device, 35-38: control Control valve, 40 to 46: electromagnetic switching valve, 53, 54: throttle valve, 55, 56: check valve with pilot, 57, 58: relief valve, 62, 63: relief valve, 64: counter balance valve, 68 : Throttle valve, 73: control valve, 79, 80: check valve with pilot, 81: throttle valve, 84: battery, 85: relief valve, 86, 87: pilot valve with pedal, 88, 89: pilot with operation lever Valve, 90-96: pressure switch, 97-100: shuttle valve, 101-103: pressure switch, 104: electromagnetic switching valve

Claims (2)

Constructed by attaching a tree treatment attachment to the tip of the working arm of the self-propelled working machine,
The tree treatment attachment includes a bracket rotatably attached to a tip of the working arm, a turning device attached to the bracket and having a hydraulic motor, and attached to a turning body of the turning device. Saw comprising a pair of gripping claws for opening and closing a tree, a cutting saw for cutting a tree attached to one end of the revolving body and driven by a hydraulic motor, and a hydraulic cylinder for moving or retracting the cutting saw toward the tree A feed device, a control valve for controlling each of the hydraulic motor and the hydraulic cylinder, an electromagnetic switching valve corresponding to each control valve for switching each control valve, and a solenoid and a power source of each electromagnetic switching valve In a tree processing machine provided with a switch for operating the electromagnetic switching valve,
A flow rate adjusting valve provided between the control valve and a main hydraulic pump provided in the self-propelled working machine body, the flow rate of which is controlled by the level of pilot pressure oil applied to the operation chamber;
Provided as an electromagnetic switching valve for switching the control valve for the hydraulic motor of the swivel device and the switch for operating the electromagnetic switching valve for switching the control valve of the hydraulic cylinder for opening and closing the gripping claws, respectively, by the pilot pressure oil acting Close pressure switch,
As the pilot valve for the hydraulic motor of the swivel device and the pilot valve for the hydraulic cylinder that opens and closes the gripping claws, the pilot hydraulic pump provided in the self-propelled work machine body and the pressure switches are provided, respectively. A manually operated pilot valve for a hydraulic motor of the swivel device having an operation lever or an operation pedal for switching a pilot pressure oil applied to each pressure switch from the pilot hydraulic pump, the secondary pilot hydraulic pressure changing according to the amount And a manually operated pilot valve for a hydraulic cylinder for opening and closing the gripping claws,
By adjusting the manually operated pilot valve for the hydraulic motor of the swivel device or the manually operated pilot valve for the hydraulic cylinder for opening and closing the gripping claw, the pilot pressure oil appearing in the secondary side circuit of these pilot valves is adjusted in the flow rate. A tree processing machine comprising a high-pressure selection circuit applied to a valve operation chamber. In the tree processing machine of Claim 1,
A tree processing machine using a spare control valve provided in the self-propelled working machine body as the flow rate adjusting valve.

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