JP4753652B2 - Tree crusher - Google Patents

Description

  In the present invention, a felled tree or a pruned tree branch is crushed by shearing with a cutter knife attached to a cutter wheel of a crushing device, and then crushed by impact with a hammer knife attached to the cutter wheel. It relates to a tree crusher.

  The tree crusher is provided with a claw-shaped moving blade on the outer periphery of the cutter wheel, a fixed blade is provided on the inner peripheral surface of the crushing frame that accommodates the cutter wheel, and the tree fed from the feeder is cut off by the moving blade, and then Some chips are further pulverized between a moving blade and a fixed blade in a pulverization frame and discharged from a screen (see, for example, Patent Document 1). This tree crusher is capable of crushing even when building nails, etc. are mixed, and uses a powerful engine such as 160 horsepower, for example, to obtain a relatively large chip of 5 cm size, for example. It is often used in some cases. Although this so-called torch-type dendrite crusher has the advantage of being able to cope with a mixture of nails, etc. as described above, it is inefficient for high output and is pulverized more finely to obtain fine chips. There is a problem that it is necessary to make it fine with a possible branch crusher.

  On the other hand, the tree fed from the feeding device is sheared by a sharp cutter knife provided on the cutter wheel, and then further by a hammer knife provided on the outer peripheral side of the cutter wheel and a fixed blade provided on the inner peripheral surface of the grinding frame. The finely pulverized type of tree pulverizer has an advantage that it can be converted into a chip even when a small engine of about 40 horsepower, for example, is used (see, for example, Patent Documents 2 and 3).

  The pulverization-type dendritic crusher having such advantages has a small engine output, so that the energy of the rotary inertia force of the cutter wheel is stored while the cutter wheel is idling, and the inertia force is added to the output of the engine. The material to be crushed is crushed by force. In Patent Document 2, the rotational speed of the cutter wheel is detected by a rotational speed sensor, and when the rotational speed reaches a preset lower rotational speed, the feeding device that feeds the tree branch to the cutter wheel is stopped, thereby When the rotation speed of the cutter wheel reaches a preset upper rotation speed, the operation of the feeding device is resumed to prevent the cutter wheel from being stopped due to overload.

  Further, in the dendritic crusher described in Patent Document 3, since the engine is directly connected to the cutter wheel, the rotation speed of the engine is detected, and when the rotation speed reaches a preset lower rotation speed, the feeding device When the engine speed is restored to the upper speed, the operation of the feeder is resumed to prevent overload and prevent the cutter wheel and the engine from stopping.

JP 2003-117421 A JP 2001-276661 A JP-A-9-123123

  The tree crusher may be operated at a work site remote from the house or may be operated at a work site close to the house. However, the tree crusher generates noise exceeding 80 dB (A) (around 7 m) during operation, and therefore, work in urban areas close to a person's house may cause noise trouble. However, the conventional dendrimer crusher has a fixed maximum rotation speed of the engine or cutter wheel, and a lower rotation speed and an upper rotation speed of the cutter wheel. Therefore, it is difficult to perform the pulverization operation with low noise even in the operation in an urban area. If the operator operates the engine's accelerator lever etc. to adjust the engine to a lower speed than the maximum speed, the feed device will be stopped by the above-mentioned means to prevent overload. Will not be able to work. Further, if the work is performed with this overload prevention means turned off, the operation becomes complicated and the labor of the operator increases.

  In view of the above problems, the present invention provides a tree crusher having a configuration that can be operated with low noise when it is necessary to work near a house such as an urban area, and can reduce annoyance caused by noise in the vicinity. The purpose is to provide.

The tree pulverizer according to the present invention includes a pulverizer having a cutter wheel for pulverizing a material to be crushed, a feeding device for feeding the material to be pulverized introduced from an inlet to the pulverizer, a motor for rotating the cutter wheel, and the A dendrite crusher provided with an engine as a power source of a motor for a feeding device and an accelerator lever for operating an accelerator cable for adjusting a fuel supply amount to the engine ;
An operating position provided as means for setting the maximum number of revolutions of the engine, capable of contacting the accelerator lever by an operator's operation, and restricting the maximum operation amount of the accelerator lever to be less than the maximum operation amount during normal work; A low-speed rotation setting lever that does not contact the accelerator lever and is displaceable between a retraction position that sets the maximum operation amount of the accelerator lever to the maximum operation amount during normal operation;
A plurality of detected portions for detecting the speed at high speed rotation when the low speed rotation setting lever is in the retracted position are arranged at equal intervals in the circumferential direction provided on the rotation shaft of the cutter wheel. A plurality of detected portions for detecting the speed at the time of low speed rotation when the low speed rotation setting lever is in the operating position, arranged in the detected portion, based on the pitch of the detected portions for detecting the speed at the time of high speed rotation. Disks arranged at equal intervals in the circumferential direction with a short pitch;
A rotation sensor for detecting the speed at the time of high-speed rotation provided opposite to the detected part for detecting the speed at the time of high-speed rotation;
A rotation sensor for detecting the speed at the time of low-speed rotation provided opposite to the detected part for detecting the speed at the time of low-speed rotation;
A selection switch that switches depending on whether the low-speed rotation setting lever is in the operating position or the retracted position;
The signals from the selection switch and the rotation sensor are taken, and when the signal from the selection switch indicates the retracted position of the low-speed rotation setting lever, the input signal of the rotation sensor for detecting the speed at the time of high-speed rotation is adopted, or When the signal from the selection switch indicates the operating position of the low-speed rotation setting lever, the input signal of the rotation sensor for detecting the low-speed rotation speed is adopted, and the signal detected by the rotation sensor is set in advance. A controller that controls the operation of the motor of the feeding device to stop when the rotational speed falls below the side rotation number, and resumes the operation of the motor of the feeding device when the upper side rotation number is set in advance. It is characterized by.

In the present invention , in addition to the setting means such as the accelerator lever of the engine, a low-speed rotation setting lever for restricting the maximum engine speed is provided, so that the maximum fuel supply amount to the engine is reduced by this low-speed rotation setting lever. By reducing the maximum number of rotations, noise can be reduced, and when pulverizing work is performed in a place where people are close to each other, such as in an urban area, inconvenience to the vicinity can be reduced.

In addition, an overload prevention device is provided that stops the feed device when the rotation speed of the cutter wheel reaches the lower rotation speed, so that the tree crusher can be continuously and automatically operated without stopping the cutter wheel. it can.

In addition, when working in a place where there is a person's house in the vicinity, by operating the tree crusher with the lower rotation speed and the upper rotation speed decreased by a low speed rotation setting lever , a low noise state It is possible to drive the vehicle in the vicinity, and the trouble to the neighborhood can be further reduced.

In addition, the pitch of the detected part for detecting the speed at the time of low-speed rotation provided in the circumferential direction of the disk is set shorter than the pitch of the detected part for detecting the speed at the time of high-speed rotation, and the low-speed rotation setting lever is A rotation sensor for detecting a high-speed rotation speed and a low-speed rotation are configured such that the selector switch is switched in conjunction with the displacement of the low-speed rotation setting lever at the same time as the displacement is made between the operating position capable of contacting the accelerator lever and the retracted position. Since the input signal to the controller for the speed detection rotation sensor is switched, the preset lower rotation speed and upper rotation speed can be changed according to the maximum rotation speed. Setting is easy.

  FIG. 1 is a longitudinal sectional view showing an embodiment of a tree pulverizer according to the present invention. This tree crusher is generally mounted on a vehicle body and configured to be self-propelled, but a configuration configured to be stationary can also be employed. Reference numeral 1 denotes a grinding device, and 2 denotes a feeding device attached to the grinding device 1. Reference numeral 3 denotes a feed frame constituting the feed device 2. The feed frame 3 has a substantially box structure with both ends open, and the inside communicates with one end of the feed frame 3. The hoppers 6 to be connected are coupled. The other end opening of the feed frame 3 is attached to one end surface of the crushing frame 7 of the crushing device 1.

  That is, the feed frame 3 is attached toward a position corresponding to the feed port 8 a which is an opening opened in one end plate 8 of the crushing frame 7.

  A feed drum 10 that is rotated by a hydraulic motor 35 (see FIG. 3) is built in the feed frame 3. The feed drum 10 is driven by the supply of hydraulic oil by a flow rate adjusting valve 37 (see FIG. 3), which will be described later, and the feed speed of the object 5 can be adjusted by adjusting the flow rate adjusting valve. The feed drum 10 is attached to the feed frame 3 so as to be movable up and down, and the crushed object 5 is put into the pulverizing frame 7 in a state where a predetermined pressure is applied to the crushed object 5 by a pressing device (not shown). Configured to send in.

  At the center of the pulverizing frame 7 of the pulverizing apparatus 1, a rotary shaft 13 is rotatably supported by both end plates 8, 11 of the pulverizing frame 7, and the rotary shaft 13 is attached to the end plate 11 via a bracket 24. Are rotated by a hydraulic motor 12 attached thereto. A front disc 14, a center disc 15, and a rear disc 16 are fitted to the rotary shaft 13 in order from the feeding device 2 side so that the center holes of the discs 14 to 16 are not relatively rotatable with the rotary shaft 13, In addition, the disks 14 to 16 are connected by a plurality of connecting rods 17 and attached.

  A cutter knife 19 having a sharp blade is attached to the front surface of the front disk 14, that is, the surface on the feeding device 2 side, approximately in the radial direction of the disk 14. Further, a through hole (not shown) is provided in a portion corresponding to the front portion of the front disk 14 in the rotational direction of the cutter knife 19, and the sheared object to be crushed can be easily moved rearward through the through hole. I can do it.

  Between the front disk 14 and the center disk 15 and between the center disk 15 and the rear disk 16, a hammer knife 20 is rotatably mounted by inserting a connecting rod 17 into a hole provided in each hammer knife 20. It is done. The discs 14 to 16, the connecting rod 17, the cutter knife 19, and the hammer knife 20 constitute a cutter wheel 21.

  The upper part of the grinding frame 7 is constituted by a grinding cover 22. A fixed blade 23 is attached to the inner peripheral surface of the crushing cover 22 so as to face the hammer knife 20.

  An opening (not shown) on the lower side of the lower part of the crushing frame 7 is opened, and a screen (not shown) having a chip passage hole is attached to the opening. Further, a chip discharge conveyor for discharging chips to the outside from the screen, a duct covering the chip, and the like are provided, but none of them is shown.

As shown in FIG. 2, a low-speed rotation sensor 26 and a high-speed rotation sensor 27 are attached to the bracket 24 to which the hydraulic motor 12 is attached. On the other hand, a disk 25 made of a magnetic material is fixed to the rotating shaft 13 concentrically with the rotating shaft 13. The disk 25 is positioned at a position facing the rotation sensors 26 and 27, with a low-rotation detected portion. A certain recessed portion 29 and a recessed portion 30 that is a detected portion for high speed rotation are provided at equal intervals in the circumferential direction. The pitch P1 of the recesses 29 for low speed rotation is shorter than the pitch P2 of the recesses 30 for high speed rotation . The rotation sensors 26 and 27 in this example are for detecting the difference in inductance of the inductors built in the sensors 26 and 27 when opposed to the concave portions 29 and 30 of the disk 25 made of a magnetic material. Pulse signals are output from the sensors 26 and 27 according to the rotation.

  FIG. 3 is a hydraulic electric circuit diagram of the tree crusher. In FIG. 3, 31 is an engine, 32 and 33 are hydraulic pumps driven by the engine 31, and these are mounted on a tree crusher. Reference numeral 34 denotes a control valve for switching and controlling the supply of hydraulic oil from the hydraulic pump 32 to the crushing hydraulic motor 12.

  Reference numeral 35 denotes a hydraulic motor that drives the feed drum 10 of the feeder 2, and reference numeral 36 denotes a control valve that switches and controls the supply of hydraulic oil from the hydraulic pump 33 to the hydraulic motor 35. Reference numeral 37 denotes a flow rate adjusting valve for supplying a certain amount of hydraulic oil to the hydraulic motor 35 via the control valve 36. The flow rate of the hydraulic oil is adjusted by adjusting the variable throttle valve 38. Reference numeral 39 is a control valve provided between the hydraulic pump 33 and the flow rate adjusting valve 37. The control valve 39 has the rotational speed of the cutter wheel 21 detected by the rotation sensor 26 or 27 reaching the lower rotational speed. Then, the hydraulic oil from the hydraulic pump 33 is shut off, the feed hydraulic motor 35 is stopped, and the supply of the hydraulic oil from the hydraulic pump 33 is resumed when the rotational speed of the cutter wheel 21 recovers to the upper rotational speed after the stop. It is.

  In order to perform such control, the following apparatus is provided. Reference numeral 41 denotes a switch which is turned on / off by an operator's operation in order to operate the feeding device 2. Reference numeral 42 denotes a controller of the feed hydraulic motor 35, which energizes or demagnetizes the relay 43 according to the rotation speed of the cutter wheel 21 detected by the rotation sensor 26 or 27, and moves to the solenoid 39 a of the control valve 39 by the battery 40. Is started and stopped to control the drive and stop of the hydraulic motor 35.

  Reference numeral 44 denotes a relay that selects one of the output signals of the rotation sensors 26 and 27 and inputs the selected signal to the controller 42 when the selection switch 45 is turned on / off. The selection switch 45 in this example is a limit switch that is switched by a striker 46.

  4 to 7 are diagrams showing the configuration of the selection switch 45 and the maximum rotational speed regulating means provided according to the present invention. 47 is an accelerator cable for controlling the fuel nozzle of the engine 31, and 49 is an accelerator lever provided as means for operating the accelerator cable 47 to control the amount of fuel supplied to the engine 31 and setting the engine speed. When the accelerator lever 49 is operated downward as indicated by an arrow R, the amount of fuel supplied to the engine increases and the engine speed increases.

  Reference numeral 50 denotes a stopper for setting the maximum operation amount of the accelerator lever 49, which contacts the contact portion 51 of the stopper 50 connected to the accelerator lever 49 and prevents the accelerator cable 47 from being pulled further.

Reference numeral 52 denotes a low-speed rotation setting lever that can be rotated horizontally by the operator operating the knob 53. Reference numeral 54 denotes a stopper provided on the low-speed rotation setting lever 52 as a maximum rotation speed regulating means. It is added by the invention. As shown in FIGS. 6 and 7, the stopper 54 is originally provided with a maximum operation amount of the accelerator lever 49 when rotated to a position where it can contact the contact portion 51 provided on the accelerator lever 49. It is restricted to be smaller than the case where it abuts against the stopper 50.

The low speed rotation setting lever 52 is also provided with a striker 46 that contacts the switch arm 45a of the selection switch 45 to operate the selection switch 45.

In this dendritic crusher, when grinding the grinding object 5 such as branches of trees or tree, usually a low-speed rotation setting lever 52 as shown in FIGS. 4 and 5, the stopper 54 abutting portion 51 The retracted position is set so as not to come into contact with. At this time, the striker 46 contacts the switch arm 45a of the selection switch 45. In FIG. 3, the contact of the selection switch 45 is open, so that the relay 44 is not excited. Therefore, the output signal of the rotation sensor 27 for high speed rotation is input to the controller 42.

  When the operator closes the switch 41 of the feeding device 2, the battery 40 is energized to the solenoid 39a of the control valve 39 through the contact of the switch 41 and the relay 43, and the control valve 39 is switched to the lower position. Here, when the operator switches the control valve 36 to the lower position, hydraulic oil from the hydraulic pump 33 is supplied to the hydraulic motor 35 through the control valve 39, the flow rate adjustment valve 37, and the control valve 36, and the feed drum 10 rotates. To do.

  Therefore, the material 5 to be crushed, which has been fed into the hopper 6 from the inlet 4 of the tree crusher, is fed by the feed drum 10 whose rotational speed is adjusted to an arbitrary feed speed by the flow rate adjusting valve 37, and the feed port 8a. Can be fed into the pulverizer 1.

  On the other hand, when the operator switches the control valve 34 for the cutter wheel to the lower position, the hydraulic oil from the hydraulic pump 32 is supplied to the hydraulic motor 12 through the control valve 34, and the cutter wheel 21 is operated at high speed by the hydraulic motor 12 for crushing. A rotation is given.

  Here, in the idling state, as shown in FIG. 8, the cutter wheel 21 holds the maximum rotation number Na. When the material 5 to be pulverized is introduced into the pulverizing device 1 by the feeding device 2, the load on the hydraulic motor 12 increases and the rotational speed of the cutter wheel 21 decreases as shown by the line a in FIG. When this rotational speed falls to the lower rotational speed N1 preset in the controller 42, the controller 42 excites the relay 43 and opens its contact. For this reason, the energization of the control valve 39 to the solenoid 39a is stopped, the control valve 39 is switched to the upper position, the hydraulic oil from the hydraulic pump 33 returns from the control valve 39 to the oil tank 56, and the hydraulic motor 35 and the feed drum Since 10 stops, the supply of the object 5 to be crushed stops. This prevents overload.

  When the feed drum 10 of the feed device 2 is thus stopped, the material 5 to be crushed by the cutter wheel 21 is reduced and the load on the hydraulic motor 12 is reduced, so that the rotational speed of the cutter wheel 21 is the line in FIG. It rises as shown in b. When this rotational speed recovers to the preset upper rotational speed N2, the controller 42 again demagnetizes the relay 43 and closes its contact, thereby energizing the solenoid 39a of the control valve 39 again. The valve 39 is switched to the lower position, the hydraulic motor 35 is driven, the feed drum 10 of the feed device 2 is driven, and crushing of the object 5 is resumed. Such work is repeated to perform the work.

On the other hand, when there is a possibility of causing noise inconvenience in the vicinity, such as in an urban area, as shown in FIGS. 6 and 7, the knob 53 is turned and a low speed rotation setting lever 52 is provided on the stopper. 54 is set to a position where it can come into contact with the contact portion 51 of the accelerator lever 49. At this time, the striker 46 is separated from the switch arm 45a of the selection switch 45, and the selection switch 45 is closed in FIG. For this reason, the contact of the relay 44 is switched, and a signal from the low-speed rotation sensor 26 is input to the controller 42. In this case, since the pitch P1 of the recess 29 facing the rotation sensor 26 for low speed rotation is smaller than the pitch P2 of the recess 30 facing the rotation sensor 27 for high speed rotation , even if the rotational speed of the cutter wheel 21 is actually low, A rotation speed signal is given to the controller 42 assuming that it is rotating at a higher rotation speed than actual.

  On the other hand, when the engine 31 is operated by rotating the accelerator lever 49, the fuel supply amount becomes maximum when the contact portion 51 of the accelerator lever 49 is in contact with the stopper 54. Since the rotation angle of the accelerator lever 49 is smaller than the state in which the contact portion 51 is in contact with the stopper 50, the amount of fuel supplied to the engine 31 is reduced, and the cutter in the idling state of the engine as shown in FIG. The maximum rotation speed Nb of the wheel 21 is lower than the maximum rotation speed Na.

  In a state where the hydraulic motor 12 is operated and the cutter wheel 21 is rotated in the same manner as described above, the hydraulic motor 35 is operated and the feed drum 10 is rotated to introduce the material 5 to be crushed into the pulverizer 1. As indicated by a line c, the rotational speed of the cutter wheel 21 decreases due to an increase in the load of the hydraulic motor 12. Then, when the preset lower rotational speed N3 corresponding to the lower rotational speed N1 is reached, the controller 42 excites the relay 43 and turns off the contact thereof, so that the energization to the solenoid 39a is stopped. Then, the feed hydraulic motor 35 stops.

  For this reason, the load of the hydraulic motor 12 is reduced, and the rotational speed of the cutter wheel 21 is increased as indicated by the line d in FIG. When the rotation speed of the cutter wheel 21 is restored to the upper rotation speed N4 set in advance corresponding to the upper rotation speed N2, the operation of the feed hydraulic motor 35 is resumed. Thereafter, this operation is repeated.

  As described above, in this embodiment, in addition to the engine speed lever 49 and other engine speed setting means, the control means such as the stopper 54 for limiting the maximum engine speed is provided. By reducing the number, noise can be reduced, and when pulverizing work is performed in a place where a person's house is in close proximity, such as in an urban area, inconvenience to the neighborhood can be reduced.

  Moreover, since the overload prevention apparatus which stops a feeding apparatus when the rotation speed of the cutter wheel 21 becomes a lower side rotation speed is provided, the tree crusher is continuously and automatically operated without stopping the cutter wheel 21. be able to.

  Further, when working in a place where there is a person's house in the vicinity, by operating the tree crusher with the rotation speed setting means reducing the lower rotation speed and the upper rotation speed to N3 and N4, respectively. Therefore, it is possible to drive in a low noise state, and it is possible to further reduce the inconvenience to the neighborhood.

Further, by rotating the low-speed rotation setting lever 52, the stopper 54 is displaced between the operating position where the stopper 54 can come into contact with the contact portion 51 and the retracted position, and at the same time, the selection switch 45 is switched and the rotation sensor 26, Since the output signal is switched between 27 and 27, and the rotation speed setting means for changing and setting the lower rotation speed N1, N3 and the upper rotation speed N2, N5 according to the maximum rotation speed Na, Nb is provided, the operator If the maximum rotational speeds Na and Nb are set, the lower rotational speeds N1 and N3 and the upper rotational speeds N2 and N4 are automatically set, so that the rotational speeds can be easily set.

  The noise reduction effect according to the present invention will be described in detail. When the maximum rotation speed of the cutter wheel 21 was reduced from 1350 rpm to 1050 rpm, the noise level could be reduced from 75.2 dB to 70.8 dB. Further, when the lower rotational speed N1 = 1163 rpm and the upper rotational speed N2 = 1200 rpm, the lower rotational speed N3 = 930 rpm, and the upper rotational speed N4 = 960 rpm, the noise level during the grinding operation is changed from 82.2 dB to 79. It could be reduced to 7 dB.

FIG. 9 shows a reference example of the present invention. In this reference example , the state of the selection switch 45, that is, the maximum rotational speed is regulated using the stopper 50 (the maximum rotational speed is Na) or the stopper 54 is used. Is input to the controller 42 as to whether the maximum rotational speed is Nb. Further, only one rotation sensor 27 is provided in the rotation sensor of the cutter wheel 21 and input to the controller 42. The controller 42 selects the lower rotation speed N1 and the upper rotation speed N2 when the selection switch 45 is open (the maximum rotation speed is Na), and switches the relay 43 on the basis of these rotation speeds N1 and N2. Energize and demagnetize. On the other hand, when the selection switch 45 is in the closed state (the maximum rotation speed is Nb), the lower rotation speed N3 and the upper rotation speed N4 are selected, and the relay 43 is energized and demagnetized based on these rotation speeds N3 and N4. It is made to let you. According to this embodiment, there is an advantage that the number of relays and the number of rotation sensors can be reduced.

  The function of the relays 43 and 44 in the embodiment of FIG. 3 or the relay 43 of FIG. 9 may be included in the controller 42.

FIG. 10 further shows another reference example of the present invention. An engine speed setting signal is given to the electronic governor 58 by, for example, a dial type operating device (rotational speed setting means) 57 as the engine 31 and the operating device 57. Is output to the setting device 59 for the lower rotation speed N1 and the upper rotation speed N2. In this setting device 59, the lower rotation speed is increased in response to the increase or decrease of the control signal applied to the governor 58. The number N1 and the upper rotation speed N2 are increased or decreased. According to this embodiment, since the rotation speed Na, the lower limit rotation speed N1 and the upper rotation speed N2 of the engine 31 can be set continuously, the work can be performed with as low noise as possible in accordance with the work environment. There is an advantage that it becomes possible.

  Note that such a continuous change in the setting of the lower rotational speed N1 and the upper rotational speed N2 can also be applied to the configuration shown in FIGS. 4 to 7 which is not a governor system.

It is a longitudinal cross-sectional view which shows one Embodiment of the branch pulverizer by this invention. It is a top view which shows the structure of the rotation sensor of embodiment of FIG. It is a hydraulic electric circuit diagram of the present embodiment. In this Embodiment, it is side surface sectional drawing which shows the state which selected the engine maximum rotation speed selection apparatus to the high speed rotation side. FIG. 5 is a horizontal sectional view of FIG. 4. In this Embodiment, it is side surface sectional drawing which shows the state which selected the engine maximum rotation speed selection apparatus to the low speed rotation side. FIG. 7 is a horizontal sectional view of FIG. 6. It is a graph which shows the change of the rotation speed of the cutter wheel in this Embodiment. It is a hydraulic electric circuit diagram showing a reference example of the present invention. It is a hydraulic electric circuit diagram which further shows the other reference example of this invention.

1: grinding device, 2: feeding device, 3: feeding frame, 4: inlet, 5: object to be ground, 6: hopper, 7: grinding frame, 8, 11: end plate, 10: feeding drum, 12: hydraulic pressure Motor: 13: Rotating shaft, 14: Front disc, 15: Center disc, 16: Rear disc, 17: Connecting rod, 19: Cutter knife, 20: Hammer knife, 21: Cutter wheel, 22: Crush cover, 23: Fixed Blade: 24: Bracket, 25: Disk, 26: Rotation sensor for low speed rotation , 27: Rotation sensor for high speed rotation , 29, 30: Recess, 31: Engine, 32, 33: Hydraulic pump, 34: Control valve, 35: Hydraulic motor, 36: Control valve, 37: Flow adjustment valve, 38: Variable throttle valve, 39: Control valve, 39a: Solenoid, 40: Battery, 41: Feeder Switch, 42: controller, 43: Relay 45: selector switch, 46: striker 47: the accelerator cable, 49: accelerator lever, 50: stopper, 51; abutting portion, 52: low speed setting lever, 53 : Knob, 54: Stopper, 56: Oil tank, 57: Operating device, 58: Bana, 59: Setting device

Claims (1)

A pulverizing apparatus having a cutter wheel for pulverizing an object to be pulverized, a feeding device for feeding the object to be crushed from a charging port to the pulverizing apparatus, a motor for rotating the cutter wheel, and a power source for the motor for the feeding apparatus A tree crusher equipped with an accelerator lever for operating an accelerator cable for adjusting an amount of fuel supplied to the engine and an accelerator cable ,
An operating position provided as means for setting the maximum number of revolutions of the engine, capable of contacting the accelerator lever by an operator's operation, and restricting the maximum operation amount of the accelerator lever to be less than the maximum operation amount during normal work; A low-speed rotation setting lever that does not contact the accelerator lever and is displaceable between a retraction position that sets the maximum operation amount of the accelerator lever to the maximum operation amount during normal operation;
A plurality of detected portions for detecting the speed at high speed rotation when the low speed rotation setting lever is in the retracted position are arranged at equal intervals in the circumferential direction provided on the rotation shaft of the cutter wheel. A plurality of detected portions for detecting the speed at the time of low speed rotation when the low speed rotation setting lever is in the operating position, arranged in the detected portion, based on the pitch of the detected portions for detecting the speed at the time of high speed rotation. Disks arranged at equal intervals in the circumferential direction with a short pitch;
A rotation sensor for detecting the speed at the time of high-speed rotation provided opposite to the detected part for detecting the speed at the time of high-speed rotation;
A rotation sensor for detecting the speed at the time of low-speed rotation provided opposite to the detected part for detecting the speed at the time of low-speed rotation;
A selection switch that switches depending on whether the low-speed rotation setting lever is in the operating position or the retracted position;
The signals from the selection switch and the rotation sensor are taken, and when the signal from the selection switch indicates the retracted position of the low-speed rotation setting lever, the input signal of the rotation sensor for detecting the speed at the time of high-speed rotation is adopted, or When the signal from the selection switch indicates the operating position of the low-speed rotation setting lever, the input signal of the rotation sensor for detecting the low-speed rotation speed is adopted, and the signal detected by the rotation sensor is set in advance. A controller that controls the operation of the motor of the feeding device to stop when the rotational speed falls below the side rotation number, and resumes the operation of the motor of the feeding device when the upper side rotation number is set in advance. A tree crusher characterized by.

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