WO2018160197A1 - Déchiqueteuse de bois à commande de production optimisée - Google Patents

Déchiqueteuse de bois à commande de production optimisée Download PDF

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Publication number
WO2018160197A1
WO2018160197A1 PCT/US2017/020715 US2017020715W WO2018160197A1 WO 2018160197 A1 WO2018160197 A1 WO 2018160197A1 US 2017020715 W US2017020715 W US 2017020715W WO 2018160197 A1 WO2018160197 A1 WO 2018160197A1
Authority
WO
WIPO (PCT)
Prior art keywords
rate
chipper
drum
wood
engine
Prior art date
Application number
PCT/US2017/020715
Other languages
English (en)
Inventor
Bradley Simon Harness
Original Assignee
Astec Industries, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Astec Industries, Inc. filed Critical Astec Industries, Inc.
Priority to EP17898822.6A priority Critical patent/EP3589414A4/fr
Priority to PCT/US2017/020715 priority patent/WO2018160197A1/fr
Publication of WO2018160197A1 publication Critical patent/WO2018160197A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
    • B02C18/16—Details
    • B02C18/22—Feed or discharge means
    • B02C18/2225—Feed means
    • B02C18/225—Feed means of conveyor belt and cooperating roller type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
    • B02C18/14—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within horizontal containers
    • B02C18/145—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within horizontal containers with knives spaced axially and circumferentially on the periphery of a cylindrical rotor unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
    • B02C18/16—Details
    • B02C18/24—Drives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C25/00—Control arrangements specially adapted for crushing or disintegrating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
    • B27L11/00—Manufacture of wood shavings, chips, powder, or the like; Tools therefor
    • B27L11/02—Manufacture of wood shavings, chips, powder, or the like; Tools therefor of wood shavings or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
    • B02C18/16—Details
    • B02C18/18—Knives; Mountings thereof
    • B02C2018/188—Stationary counter-knives; Mountings thereof

Definitions

  • the present invention relates generally to a material reduction machine in the nature of a drum-type wood chipper, and more particularly, to a method and apparatus for optimizing the operating rate of such a machine.
  • Material reduction machines in the nature of wood chippers are used to reduce wood to chips of various sizes, depending on their intended use.
  • a machine will comprise a reducing assembly having a rotating disk or drum with a plurality of cutting blades mounted around the periphery of the rotating disk or drum.
  • the machine will include an enclosure for the reducing assembly, which enclosure will typically have a feed inlet through which wood materials such as logs and branches to be reduced are introduced, and a discharge outlet through which the chips are discharged after reduction.
  • the use of wood chippers avoids the environmental and other problems associated with burning trees and brush for disposal, or with disposing of them in a landfill.
  • a wood chipper may be employed to produce a valuable chip product.
  • Wood chips can be used as mulch or fuel. They can also be used as raw material for creating a pelletized fuel product or as raw material in a chemical pulp process.
  • Disk-type wood chippers include blades mounted on a rotating disk that cut across the grain of the wood stem generally perpendicular to the direction of the grain.
  • Drum-type wood chippers include cutting blades mounted around the circumferential wall of a cylindrical chipper drum that cut across the wood feed stock in a path that varies with respect to the orientation of the grain of the feed stock to the drum.
  • a drum-type wood chipper includes a feed mechanism, a chipper drum that is partially enclosed in a housing, and a discharge chute.
  • the chipper drum has a circumferential wall and is mounted for rotation on a shaft by means of an internal combustion engine or other driver engine.
  • a plurality of cutting blades, each having a leading edge, are spaced around the circumferential wall of the chipper drum. As the drum rotates, the leading edges of the blades cut an arc that is concentric with and of a larger diameter than the circumferential wall of the drum.
  • the feed mechanism carries woody material to be chipped into contact with the cutting blades on the chipper drum.
  • the chips produced by a drum-type wood chipper will be of a generally uniform size if the rotational speed of the chipper drum, the extension of each blade from the circumferential wall of the drum, and the feed speed of material to the chipper drum are controlled so that the wood moves a precise distance toward the chipper drum during the time it takes for the drum to rotate from the completion of the cutting of a chip by a blade to the beginning of the cutting of a chip by the next blade mounted on the circumferential wall of the drum.
  • the presentation of wood to the chipper drum by the feed mechanism causes resistance against the rotation of the chipper drum, and this resistance will slow the rate of rotation of the drum.
  • the operator of the wood chipper may reduce the rate of advance of wood to the chipper drum by the feed mechanism in an attempt to maintain the desired chip size.
  • This feed mechanism speed response to resistance-induced chipper drum rotational rate changes is often effective for small changes in the rotational rate of the chipper drum.
  • the operator of a conventional wood chipper may not be able to reduce the feed mechanism speed quickly enough to avoid stalling of the engine that drives the chipper drum. Consequently, conventional wood chippers are typically operated so that the feed mechanism will stop when resistance to the rotation of the chipper drum slows the driver engine to a predetermined lower operating rate.
  • Another conventional method of operation is to operate the feed mechanism so as to reduce the rate of advance of wood to the chipper drum faster than the rate of reduction of the rotational rate of the chipper drum as the chipper drum slows due to resistance.
  • This method of operation which is sometimes referred to as "grinding mode" will insure that the engine driving the chipper drum will not stall; however, chips produced using this method will not be uniform in size, even though the overall production quantity will be increased over what may be obtained using a chipping mode of operation.
  • interconnected refer to a relationship wherein structures are secured or attached to one another either directly or indirectly through intervening structures, as well as both moveable and rigid attachments or relationships, unless specified herein or clearly indicated by context.
  • operatively connected is such an attachment, coupling or connection that allows the pertinent structures to operate as intended by virtue of that relationship.
  • downstream refers to a relative position in the direction of the movement of wood or wood chips through the wood chipper or component thereof.
  • engine refers to an internal combustion engine or other device that is operatively connected to the cutting drum of a drum-type wood chipper and adapted to generate the power for rotating the cutting drum during operation of the machine.
  • the invention comprises a drum-type wood chipper comprising a chipper drum assembly including a chipper drum with a plurality of cutting blades that are disposed around the periphery of the chipper drum and an engine that is adapted to rotate the chipper drum about a generally horizontal drum axis.
  • the chipper drum has a chipper drum radius, and the plurality of cutting blades have leading edges that define a chipping arc of rotation as the chipper drum rotates, which chipping arc of rotation has a radius that is larger than the chipper drum radius by a predetermined amount.
  • the drum-type wood chipper includes a feed system that is adapted to advance wood to be processed towards the chipper drum, and a controller.
  • the controller is operatively connected to the engine and adapted to determine an instantaneous engine operating rate during rotation of the chipper drum.
  • the controller is also operatively connected to the feed system and adapted to control the rate of advance of wood towards the chipper drum.
  • the controller is also adapted to modify the rate of advance of wood towards the chipper drum as the instantaneous engine operating rate changes while the chipper drum is being rotated.
  • an operator of the machine may enter information into the controller by means of a controller interface.
  • information may include a desired maximum engine operating rate and a desired minimum engine operating rate.
  • the controller is operatively connected to the controller interface and adapted to receive the maximum engine operating rate entered by the operator and the minimum engine operating rate entered by the operator.
  • the controller is adapted to determine a grinding mode rate of decline of the speed of the feed system as the engine operating rate decreases during operation of the wood chipper from a maximum predetermined engine operating rate to a minimum predetermined engine operating rate, and to determine a chipping mode rate of decline of the speed of the feed system as the engine operating rate decreases during operation of the wood chipper from the maximum engine operating rate to the minimum engine operating rate.
  • the controller will cause the speed of the feed system to decline at the chipping mode rate of decline as the engine operating rate decreases from the maximum engine operating rate to a predetermined intermediate engine operating rate, and it will cause the speed of the feed system to decline at a rate that is greater than the chipping mode rate but less than the grinding mode rate as the engine operating rate decreases from the intermediate engine operating rate.
  • the preferred embodiment of the invention also comprises a method of operating a wood chipper such as is described above at a higher production rate than a machine operating in chipping mode, while maintaining acceptable chip size uniformity. This method takes advantage of the fact that as resistance causes the rotational rate of the chipper drum to slow, the operating rate of the engine that is operatively connected to the chipper drum will also slow.
  • the wood chipper is operated so as to maintain a desired relationship between the rate of advance of wood towards the chipper drum and the engine operating rate.
  • the controller is adapted to determine a grinding mode rate of decline of the speed of the feed system as the engine operating rate decreases during operation of the wood chipper from a maximum predetermined engine operating rate to a minimum predetermined engine operating rate, and to determine a chipping mode rate of decline of the speed of the feed system as the engine operating rate decreases during operation of the wood chipper from the maximum engine operating rate to the minimum engine operating rate.
  • the controller causes the speed of the feed system to decline at the chipping mode rate of decline as the engine operating rate decreases from the maximum engine operating rate to a predetermined intermediate engine operating rate, and it causes the speed of the feed system to decline at a rate that is greater than the chipping mode rate but less than the grinding mode rate as the engine operating rate decreases from the intermediate engine operating rate.
  • Figure 1 is a perspective view of a drum-type wood chipper that may be operated according to the invention.
  • Figure 2 is a schematic sectional view of a portion of the chipper drum assembly and certain components of the feed system that are adapted to advance wood to be processed towards the chipper drum, showing a log that is positioned for operation of the wood chipper in chipping mode.
  • Figure 3 is an exemplary graphical representation of the operation of a drum-type wood chipper in chipping mode.
  • Figure 4 is a schematic sectional view of a portion of the chipper drum assembly and certain components of the feed system that are adapted to advance wood to be processed towards the chipper drum, showing a log that is positioned for operation of the wood chipper in grinding mode.
  • Figure 5 is an exemplary graphical representation of the operation of a drum-type wood chipper in grinding mode.
  • Figure 6 is an exemplary graphical representation of the operation of a drum-type wood chipper according to a preferred embodiment of the invention.
  • a preferred embodiment of the invention comprises a drum-type wood chipper 10 which includes trailer 12 that is adapted to be pulled by a tractor or other vehicle.
  • Trailer 12 includes frame 14 that is supported by wheels 16 and a pair of adjustable support legs, one of which, support leg 18, is shown in Figure 1.
  • the wood chipper can be mounted on a self- propelled frame or chassis, or on a fixed frame.
  • feed chute 20 Supported on frame 14 of trailer 12 are feed chute 20 and a chipper drum assembly that is partially enclosed by chipper drum housing 22.
  • Accelerator wheel housing 26 houses an accelerator wheel (not shown) downstream of chipper drum housing 22, and discharge chute 28 is located downstream of the accelerator wheel.
  • Other embodiments of the invention omit the accelerator wheel and its housing, and locate the discharge chute adjacent to the chipper drum assembly.
  • the chipper drum assembly includes chipper drum 30 that is mounted for rotation (in the counter-clockwise direction, as shown in Figures 2 and 4) about generally horizontal drum axis AD.
  • Chipper drum 30 includes circumferential wall 31 defining chipper drum radius RD, and a plurality of pockets 32 that are spaced around the periphery of chipper drum 30 within circumferential wall 31.
  • a plurality of cutting blades 34, each of which has a leading edge 35, are disposed around the periphery of chipper drum 30.
  • a cutting blade 34 is mounted on each of the pockets so that as chipper drum 30 rotates, the leading edges 35 of the plurality of cutting blades 34 define a chipping arc of rotation Ac that is parallel to circumferential wall 31 and has a larger radius than the radius RD of the circumferential wall. Consequently, chipping arc of rotation Ac has a radius Rc that is larger than the chipper drum radius RD by a predetermined amount Rp, as can be seen in Figure 2.
  • a feed system is provided to advance wood to be processed towards chipper drum 30.
  • the preferred feed system includes feed conveyor 36 and compression roller 37.
  • compression roller 37 is mounted on pivotal arm 38, which is adapted to pivot about pivot axis Ap with respect to the frame of wood chipper 10.
  • Compression roller 37 is adapted to be urged generally downwardly towards feed conveyor 36 and cooperates with feed conveyor 36 to align and urge a log such as log 40 towards chipper drum 30.
  • Engine 41 is also mounted on frame 14 of wood chipper 10, and is adapted to provide a rotational force to chipper drum 30 within chipper drum housing 22 by means of one or more drive belts or other conventional drive transfer mechanisms (not shown).
  • engine 41 is also adapted to provide a rotational force to the accelerator wheel within accelerator wheel housing 26, which rotates in the same direction as chipper drum 30 by means of one or more drive belts or other conventional drive transfer mechanisms (not shown).
  • the accelerator wheel acts to increase the momentum of chips produced by chipper drum 30 into (and out of) discharge chute 28 along discharge path 46.
  • Controller interface 48 is provided by which an operator may enter operating parameters for wood chipper 10 into controller 50.
  • Controller 50 may embody a single microprocessor or multiple microprocessors that include components for controlling operations of wood chipper 10 based on input from an operator of the wood chipper and on sensed or other known operational parameters.
  • Controller 50 may include a memory, a secondary storage device, a processor and other components for running an application.
  • Various other circuits may be associated with controller 50 such as power supply circuitry, sensor signal circuitry, signal conditioning circuitry, solenoid driver circuitry and other types of circuitry. Numerous commercially available microprocessors can be configured to perform the functions of controller 50. It should be appreciated that controller 50 could readily be embodied in a general purpose computer or machine microprocessor capable of controlling numerous machine functions.
  • Controller 50 is operatively connected to engine sensor 51 (shown in Figure 1) for determining the instantaneous operating rate of engine 41. Controller 50 is operatively connected to feed rate sensor 52 (shown in Figures 2 and 4) or to another sensor (not shown) for determining the linear speed of conveyor 36. Controller 50 is also operatively connected to a conventional drive system for feed conveyor 36 and is adapted to modify the linear speed of the feed conveyor. Controller 50 may also be operatively connected to engine 41 and adapted to modify the rotational speed of the cutting drum by modifying the engine operating rate.
  • controller 50 Examples of information that may be input into controller 50 by an operator through controller interface 48 are the chipper drum radius RD, the number and spacing of cutter blades mounted on the chipper drum, and the measured gap Rp between the chipper drum radius RD and the chipping arc of rotation radius Rc.
  • the operator may also enter a maximum engine operating rate and a minimum engine operating rate, and the beginning rate of advance of wood to the chipper drum.
  • the operator may enter a desired relationship, in the form of a ratio or a formula, between the rate of advance of wood towards the chipper drum (i.e., the speed of the feed conveyor) and the engine operating rate.
  • a wood chipper such as wood chipper 10 may be operated in a chipping mode in order to produce chips of a uniform size, without attempting to maximize an overall production rate.
  • Figure 2 illustrates the presentation of log 40 to chipping drum 30 according to a chipping mode of operation.
  • certain operating parameters must be strictly controlled, including the rotational speed of the chipper drum (which is based in part on the number and spacing of cutting blades mounted around the periphery of the chipper drum and the size of the gap Rp between the chipper drum radius RD and the chipping arc of rotation radius Rc) and the rate of advance of wood to be chipped to the chipper drum.
  • the presentation of a log to the chipper drum for the cutting of chips causes resistance that reduces the rate of rotation of the chipper drum and increases the load on the engine.
  • the amount of resistance generated depends primarily on the rate of advance of the wood to the chipper drum. If this resistance is significant, the engine will not be able to maintain the desired rotational speed of the chipper drum, and the chipper drum will slow.
  • the operator can attempt to reduce the rate of advance of the wood to be chipped proportionally to the rate of reduction of the engine operating rate for the portion of the operating cycle indicated by line segment 53, in order to maintain the desired chip size.
  • Figure 3 illustrates a chipping mode method of control, wherein the maximum (or beginning) engine operating rate is set at 2150 rpm, and the beginning rate of advance of wood to the chipper drum is set at 108 ft/min.
  • x is the engine operating rate in rpm) to 80ft/min at the minimum engine operating rate of 1600 rpm, which is the rate at which the advance of wood to the chipper drum is stopped in order to avoid stalling of the engine.
  • This stoppage of the advance of wood to the chipper drum is characteristic of a chipping mode of operation, since reducing the rate of advance of wood to the chipper drum is not always effective to maintain uniform chip size when the load imposed on the engine by resistance occurs suddenly or is particularly large.
  • This stoppage of the advance of wood to the chipper drum when the operating rate of the engine falls to the predetermined limit of 1600 rpm is indicated by line segment 54 of Figure 3.
  • FIG. 4 illustrates the presentation of log 40 to chipping drum 30 according to a grinding mode of operation.
  • the rate of advance of wood to the chipper drum is reduced at a greater rate than the rate of reduction of the rotational speed of the chipper drum that is caused by resistance. This method of operation will insure that the engine will not stall; however, chips produced using this method will not be uniform in size, even though the overall production quantity will be increased over what may be obtained using a chipping mode of operation.
  • the rate of advance of the wood to be chipped is reduced at a greater rate than the rate of reduction of the engine operating rate for the operating cycle indicated by line segment 56, in order to avoid engine stalling.
  • Figure 5 illustrates a grinding mode method of control, wherein the maximum (or beginning) engine operating rate is set at 2150 rpm, and the beginning rate of advance of wood to the chipper drum is set at 108 ft/min.
  • This mode of operation maximizes the overall production rate of the wood chipper, but does not result in the production of chips of uniform size.
  • the preferred embodiment of the invention comprises a controller and control method for a wood chipper which allows operation at a higher production rate than a machine operating in a typical chipping mode, while maintaining relative chip size uniformity at a much greater level than could be obtained from operation in a typical grinding mode.
  • the controller is adapted to monitor the instantaneous engine operating rate during rotation of chipper drum, and to modify the rate of advance of wood towards the chipper drum as the instantaneous engine operating rate changes while the chipper drum is being rotated.
  • the controller is adapted to modify the rate of advance of wood towards the chipper drum in order to maintain a desired relationship between the rate of advance of wood towards the chipper drum and the engine operating rate.
  • Controller 50 is operatively connected to controller interface 48 and adapted to receive a predetermined maximum engine operating rate that is entered by the operator, a predetermined minimum engine operating rate and a predetermined intermediate engine operating rate between the predetermined maximum and the predetermined minimum rates.
  • the intermediate engine operating rate for this control method is set by the operator so as to account for field conditions and wood type and to optimize chip product uniformity and production rate according to desired production and chip uniformity requirements.
  • Controller 50 is also adapted to receive a beginning rate of advance of the feed system that is entered by the operator
  • the controller is adapted to reduce the speed of the feed conveyor at a first rate as the engine operating rate decreases during operation of the wood chipper from the maximum engine operating rate to an intermediate engine operating rate, and at a second rate which is greater (i.e., steeper) than the first rate as the engine operating rate decreases from the intermediate engine operating rate.
  • the controller is adapted to reduce the speed of feed conveyor 36 at a first rate as the engine operating rate decreases during operation of the wood chipper from the maximum engine operating rate to the intermediate engine operating rate, as illustrated by line segment 58 of Figure 6, and at a second rate which is greater (i.e., steeper) than the first rate as the engine operating rate decreases from the intermediate engine operating rate (indicated at 59 in Figure 6), as illustrated by line segment 60 of Figure 6.
  • the controller monitors the instantaneous engine operating rate during rotation of chipper drum 30, and causes the speed of the feed system to decline at a calculated chipping mode rate of decline as the resistance-induced decline in the rotational speed of the chipper drum causes the engine operating rate to decrease from the maximum engine operating rate to a predetermined intermediate engine operating rate, and it causes the speed of the feed system to decline at a rate that is greater than the chipping mode rate but less than a calculated grinding mode rate as the engine operating rate decreases from the intermediate engine operating rate.
  • the advance of wood to the chipper drum does not cause the engine to stall except under the most severe conditions. Operation of a wood chipper according to this control method allows for a high production rate with a limited amount of non-uniformly sized chips. The small compromise in chip uniformity is offset by higher production than is obtained by a wood chipper operating in chipping mode.
  • controller 50 is adapted to receive a predetermined maximum engine operating rate, such as, for example, 2150 rpm, that is entered by the operator, a predetermined minimum engine operating rate, such as for example, 1600 rpm, and a predetermined intermediate engine operating rate between the predetermined maximum and the predetermined minimum rates, such as for example, 1800 rpm.
  • the intermediate engine operating rate for this control method may be set by the operator so as to take into consideration field conditions and wood type and to optimize chip product uniformity and production rate according to desired production and chip uniformity requirements.
  • controller 50 is also adapted to receive a beginning rate of advance of the feed system, such as, for example, 108 ft/min., that is entered by the operator.
  • the controller is adapted to reduce the speed of feed conveyor 36 at a first rate as the engine operating rate decreases during operation of the wood chipper from the maximum engine operating rate to the intermediate engine operating rate, as illustrated by line segment 58 of Figure 6, and at a second rate which is greater (i.e., steeper) than the first rate as the engine operating rate decreases from the intermediate engine operating rate (indicated at 59 in Figure 6), as illustrated by line segment 60 of Figure 6.
  • the controller is adapted to determine or calculate a chipping mode rate of decline of the speed of the feed system as the engine operating rate decreases during operation of the wood chipper from the maximum engine rotation rate to the minimum engine rotation rate.
  • Such a rate is illustrated by line segment 58 of Figure 6, which is shorter than, but at the same slope as, line segment 53 of Figure 3.
  • the controller in this embodiment of the invention is also adapted to determine or calculate a grinding mode rate of decline of the speed of the feed system as the engine operating rate decreases during operation of the wood chipper from the maximum engine rotation rate to the minimum engine rotation rate. Such a rate is illustrated by line segment 56 of Figure 5. Then, when the engine operating rate falls under load, the controller will cause the speed of the feed system to decline according to the calculated chipping mode of operation, to the predetermined intermediate rate of 88 ft/min. as indicated by point 59 of Figure 6.
  • the controller will thereafter cause the speed of the feed system to decline at a rate that is greater than the calculated chipping mode rate but less than the calculated grinding mode rate as the engine operating rate decreases from the intermediate engine rotation rate.
  • a rate of decline of the feed conveyor as the engine operating rate decreases is illustrated by line segment 60 of Figure 6. Its slope may be compared to that of line 54 of Figure 3 and that of line segment 56 of Figure 5.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)

Abstract

La présente invention concerne une déchiqueteuse de bois de type tambour pour le traitement du bois comprenant un tambour de déchiqueteuse qui est conçu pour tourner autour d'un axe de tambour généralement horizontal, une pluralité de lames de coupe qui sont disposées autour de la périphérie du tambour de déchiqueteuse, et un moteur qui est conçu pour faire tourner le tambour de déchiqueteuse autour de l'axe de tambour. La déchiqueteuse de bois comprend également un dispositif d'avance qui est conçu pour faire avancer le bois devant être traité vers le tambour de déchiqueteuse, et un dispositif de commande qui est relié de manière fonctionnelle au moteur et conçu pour déterminer une vitesse de fonctionnement instantanée du moteur pendant la rotation du tambour de déchiqueteuse. Le dispositif de commande est également relié de manière fonctionnelle au dispositif d'avance et conçu pour commander la vitesse d'avance du bois vers le tambour de déchiqueteuse. Le dispositif de commande est également conçu pour modifier la vitesse d'avance du bois vers le tambour de déchiqueteuse lorsque la vitesse de fonctionnement instantanée du moteur change pendant que le tambour de déchiqueteuse tourne.
PCT/US2017/020715 2017-03-03 2017-03-03 Déchiqueteuse de bois à commande de production optimisée WO2018160197A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP17898822.6A EP3589414A4 (fr) 2017-03-03 2017-03-03 Déchiqueteuse de bois à commande de production optimisée
PCT/US2017/020715 WO2018160197A1 (fr) 2017-03-03 2017-03-03 Déchiqueteuse de bois à commande de production optimisée

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PCT/US2017/020715 WO2018160197A1 (fr) 2017-03-03 2017-03-03 Déchiqueteuse de bois à commande de production optimisée

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