EP1674221B1 - Vorrichtung zum Quertrennen von länglichen Holzstücken - Google Patents

Vorrichtung zum Quertrennen von länglichen Holzstücken Download PDF

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Publication number
EP1674221B1
EP1674221B1 EP04030431.3A EP04030431A EP1674221B1 EP 1674221 B1 EP1674221 B1 EP 1674221B1 EP 04030431 A EP04030431 A EP 04030431A EP 1674221 B1 EP1674221 B1 EP 1674221B1
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EP
European Patent Office
Prior art keywords
transport
wood
cutting
lengths
parts
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Legal status (The legal status 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 status listed.)
Expired - Fee Related
Application number
EP04030431.3A
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English (en)
French (fr)
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EP1674221A1 (de
Inventor
Bertil Lindberg
Gunnar Marklund
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Renholmens Mekaniska Verkstad AB
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RENHOLMENS MEKANISKA AB
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Priority to EP04030431.3A priority Critical patent/EP1674221B1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B5/00—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor
    • B27B5/16—Saw benches
    • B27B5/22—Saw benches with non-feedable circular saw blade
    • B27B5/228—Cross-cutting automatically laterally-fed travelling workpieces; Reducing lumber to desired lengths
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B25/00—Feeding devices for timber in saw mills or sawing machines; Feeding devices for trees
    • B27B25/04—Feeding devices for timber in saw mills or sawing machines; Feeding devices for trees with feed chains or belts

Definitions

  • the present invention concerns a device according to the preamble to claim 1.
  • Such a device is known from DE 42 35 240 A1 .
  • Lengths of wood such as planks and board are normally stacked into packets of standard lengths that are wrapped with plastic on similar packaging material before being distributed to the consumer. Before the lengths of wood are stacked and packaged in layers, they must be cut at the root and/or top end to lengths specified by the buyer or determined by the intended use of the wood, if the wood is to be used for construction purposes or similar for example.
  • the cutting operation is done in a crosscutting saw through which the layer of wood is fed towards saw blades at right angles to its length axis on a pusher conveyor.
  • Such crosscutting sores are normally be cut with two or more circular saws that can be positioned across the direction of transport of the lengths of wood and whose relative distance from each other can be changed.
  • the lengths of wood are placed on a conveyor comprising a number of continuous chains. These chains are fitted with pushers, which, while in contact with the rear edge of a length of wood, push one piece of wood or an entire layer through the crosscutting saw.
  • One problem with feeding an entire layer of wood using the said pusher conveyor is that individual pieces of wood in the layer are not always maintained at right angles while they are passing through the saw blades.
  • defects such as being crooked, warped and twisted, or defects more on the surface, such as wanes.
  • the lengths of wood are not ideally straight and free from defects, particularly the pieces at the front of the layer tend to turn and move during the cutting operation while the layer is being pushed from behind by the conveyor. That the lengths of wood move while being cut results in a poor surface of the cut and, above all, a very poor cutting precision.
  • the object of this invention is to achieve a device offering improved cutting precision. Furthermore, the intention is to achieve a device that also allows a simplified method of setting different cutting lengths of the wood. More precisely, the intention is for a device for crosscutting that makes it possible at high speed and independent to the rate of the arriving lengths of wood to feed an entire layer of wood through the saw while maintaining a satisfactory cut quality and precision.
  • a device for crosscutting lengths of wood comprises a frame consisting of two vertical frame parts 1 located a distance from each other and whose bottom ends are fixed to a surface 2, such as a concrete floor, and a first horizontal frame part 3 of framework type extending between the top ends of the vertical frame parts 1 and a second horizontal frame part 4 in the form of beams positioned below the first horizontal frame part.
  • a surface 2 such as a concrete floor
  • a first horizontal frame part 3 of framework type extending between the top ends of the vertical frame parts 1 and a second horizontal frame part 4 in the form of beams positioned below the first horizontal frame part.
  • the first horizontal frame part 3 is controlled by means of holding and guiding 5, which act between the free ends of the first horizontal frame part 3 and the top ends of the vertical frame parts 1.
  • These means of holding and guiding 5 comprise interacting guide pins 6 and guide rails 7 arranged at each end of the horizontal frame part 3 and the top ends of the vertical frame parts 1 respectively.
  • the first horizontal frame part 3 can be raised to load as illustrated by the double ended arrow 8 in fig. 3 through the action of a means of lifting 9.
  • This means of lifting 9 comprises a respective jack 10 acting on each end of the first horizontal frame part 3 and a respective shaft 11 with which the jacks are linked for synchronous drive from one single motor 12.
  • the present crosscutting saw is integrated as a transitional step between on both sides adjoining conventional conveyors, i.e. conveyors comprising a number of adjacent chains fitted with pushers 13 running in channelled rails 14 with which chains the lengths of wood 15 are fed at right angles to their length as illustrated by arrow 16.
  • conveyors comprising a number of adjacent chains fitted with pushers 13 running in channelled rails 14 with which chains the lengths of wood 15 are fed at right angles to their length as illustrated by arrow 16.
  • that part of the conveyor which, seen in the direction of transport, is positioned before the crosscutting saw is generally designated the input conveyor 17 and that part positioned after the crosscutting saw the output conveyor 18.
  • first and a second generally designated 19 combined cutting and transport unit i.e. a unit that besides a means of cutting 20 the arriving lengths of wood 15 is also equipped with a means of transport 21 providing controlled and regulated feed of the lengths of wood through the means of cutting.
  • the position of each such combined cutting and transport unit 19 can be adjusted in relation to the transport direction of the lengths of wood 15 as illustrated with the double ended arrow 22 in fig. 3 , whereby one of the cutting and transport units 19 can be adjusted independently from the other.
  • each cutting and transport unit 19 comprises an upper part 23 and a lower part 24, each forming a separate unit.
  • the lower part 24 comprises a stand 25, which, via means of holding and guiding 26 comprising guide rails 27, is slide mounted onto the second horizontal frame part 4 extending between the two vertical frame parts 1.
  • the lower part 24 can be offset on the said guide rails 27 across the direction of transport of the lengths of wood 15, i.e. along the said lengths of wood.
  • the lower part 24 on the guide rails 27 is offset through the action of a means of driving 29 comprising a motor 30 mounted in the stand 25 exhibiting a gear wheel 32 arranged on a shaft 31 interacting with a gear rack 33 extending along one of the beams forming part of the second horizontal frame part 4.
  • means of locking 34 comprising pneumatic cylinders that can be applied against the long sides of the frame parts 4 for locking.
  • the means of transport 21 for feeding the lengths of wood 15 through the means of cutting 20 comprise wood transporting parts forming part of both the upper part 23 and the lower part 24.
  • the wood transporting parts comprising principally a parallel running first and second pair of endless transport elements 35 and 36 respectively, of which one pair of transport elements 35 is located above the second pair of transport elements 36 at such a relative distance that the lengths of wood 15 can be fed between the meeting parts of the upper and lower pair of transport elements.
  • first and the second transport element 35 and 36 respectively are arranged in pairs in the present embodiment of the invention it should be understood that in certain applications, it should be sufficient if each transport element is designed only as a single running element. For example, this will be sufficient when a length of wood is to be cut close to one end, i.e. end cutting.
  • the aforesaid pair of transport elements 36 is located in the lower part 24 and therefore comprises transport chains 37, the parts of which that are active in transporting the wood are arranged an elastomeric friction material.
  • the parts are covered with a friction material such as rubber and which transport chains 37 driven by a motor 38 run in parallel pairs over a number of wheels 39.
  • the speed of the motor 38 is adapted so that the speed of the second pair of transport elements 36 is synchronous with the speed of the input and output conveyors 17 and 18 respectively.
  • the upper parts 40 of the second pair of transport elements run along grooves 41 arranged in a plate 42 included in the lower part is 24 stand 25.
  • the lower part 24 means of cutting 20 comprises a motor 43 that drives a saw blade 44 positioned parallel to the direction of transport 16 and so at right angles to the lengths of wood 15.
  • the upper parts 40 of the second pair of transport elements 36 run at a relatively small distance from each other on both sides of an active part of the saw blade 44 extending up through a slit 45 arranged in the plate 41. It should be understood that the closer both the upper parts 40 of the pair of transport elements 36 are to the saw blade 44, the more secure and fixated can the length of wood 15 be held during the cutting operation.
  • the upper part 23 has a stand 46, which, via means of holding and guiding 47, is slide mounted to the horizontal beam 3 of the frame for moving along the first horizontal frame part 3.
  • the means of holding and guiding 47 comprise interacting means of holding 48 and guide rails 49, whereby the said guide rails run parallel and at a distance from each other along the bottom of the second horizontal frame part 3.
  • the means of holding and guiding 47 also comprise pneumatic locks to secure the upper part 23 relative to the horizontal frame part 3.
  • the upper part 23 comprises a means of clamping 50 in the form of a cradle 52 suspended from a link arm system 51 that is used to hold down the lengths of wood 15 against the upper parts 40 of the lower part's second pair of transport elements 36.
  • This cradle 52 supports in turn the aforesaid first pair of transport elements 35, which hereby comprise two endless straps 53 running in parallel pairs over several wheels 54 mounted on the cradle.
  • the conveyor belts comprise a suitable elastomeric friction material such as rubber.
  • the bottom parts 55 of the first pair of transport elements 35 run on the outside of a plate 56 arranged on the lower part of the cradle 52 that in a supporting manner absorbs forces from the passing lengths of wood 15.
  • the cradle 52 also supports a motor 57 used to drive one of the said wheels 54 and thereby the first pair of transport elements 35 synchronously with the lower part's 24 second pair of transport elements 36 of chain type.
  • one of the wheels 54 can be adjusted via a means of adjustment 58.
  • the link arm system 48 comprises a front and a rear pair of swivel arms 59 and 60 respectively, which are so pivoted with the stand 46 and cradle 52 respectively that the said cradle, which should be understood if fig. 1 is studied closely, can be swung vertically downwards in a clockwise direction towards both the upper parts 40 of the second pair of transport elements 36. That is to say, so that both lower parts 55 of the first pair of continuous transport elements 35 are moved in a downwards direction towards both upper parts 40 of the second pair of continuous transport elements 36. See also fig. 1 .
  • the distance between both lower parts 55 of the first pair of transport elements 35 and both upper parts 40 of the second pair of transport elements 36 must be adaptable to allow such random variations.
  • a spring pressure device 61 in the former pneumatic cylinder pivot mounted between the cradle 52 and the upper part's 23 stand 46.
  • the clamping capability can be further improved by the choice of continuous belts with suitable elastic properties for the first pair of transport elements 35. In this part, it could be considered to use hose-like belts filled with air or gas to offer the same clamping force on the lengths of wood even when they exhibit considerable variations in thickness.
  • first up and down folding flaps 62 across the direction of transport of the lengths of wood 15.
  • These first flaps 62 are operated via means of actuation and control 63 in the form of pneumatic cylinders, whereby the flaps are shown in lowered position with a dotted line in fig. 1 . See also fig. 2 .
  • actuation and control 63 in the form of pneumatic cylinders, whereby the flaps are shown in lowered position with a dotted line in fig. 1 . See also fig. 2 .
  • Around each flap 62 runs a conveyor chain 65 on wheels 64 that is driven by a motor 66. Seen in the direction of transport and as best shown in fig.
  • the flap's 62 conveyor chains 65 and the conveyor chains 13 of the input and output conveyors 17, 18 respectively overlap each other like interlocking fingers when the flaps 62 are in their raised positions.
  • the lengths of wood 15 can be conveyed from the input conveyor 17 to the crosscutting saw and on from the same to the output conveyor 18.
  • the flaps 62 are in the lowered positions, i.e. in the positions shown with a dotted line in fig. 1 , the lower part 24 of the crosscutting saw goes free from the input and output conveyors 17, 18 and is allowed to move sideways along the first and second horizontal frame parts 3, 4.
  • the crosscutting saw is equipped with other types of folding flaps 67, which, like the flaps described above, exhibit a synchronous motor-driven continuous conveyor chain 69 running around wheels 68 facing towards the input conveyor 17 and intended to be operated by hand.
  • This second type of flap 67 is essentially longer than the flaps 62 described above and has, for swinging between a lowered normal position and a raised alternative position illustrated by a dotted line in fig. 1 , one end pivot mounted to the lower part's 24 stand 25. In this longer flap's 65 raised position, the means of cutting 20 becomes very easy to access for service and maintenance.
  • the present crosscutting saw also includes a means of coupling 70, which allows the upper 23 and lower 24 part respectively in each cutting and transport unit 19 to be coupled for a common instantaneous movement along the first and second horizontal frame parts 3, 4 of the frame 2 through the action of the means of driving 29 described above.
  • the means of coupling 70 is described in more detail with reference to the detailed enlargement shown in fig. 3 and as is evident herein, the means of coupling comprises matching pins 71 and recesses 72 that are arranged to the upper 23 and the lower 24 part respectively. The said pins and recesses can be engaged with each other by the upper part 23, using the means of lifting 9, being lowered so it makes contact with the lower part 24 and essentially rests on the same.
  • the means of coupling 70 has a means of locking 73 comprising a locking arm 74 pivot mounted to the lower part with a hook section and a pin 75 arranged on the upper part to which the hook section can engage in an interlocking position.
  • the locking arm 74 is swung by the action of a means of actuation and control 76 in the form of a pneumatic cylinder.
  • both cutting and transport units 19 set at a suitable distance from each other to obtain the necessary cutting length for the passing lengths of wood and with the flaps 62 in their raised positions, the layers of wood 15 arriving on the input conveyor 17 are made to pass between the meeting upper and lower parts 40, 55 of the pairs of transport elements 35, 36.
  • the lengths of wood 15 are fed through the saw blades 44 and conveyed, after passing between the upper and lower parts 55, 40 of the pairs of transport elements 35, 36, to the output conveyor 18 for further handling.
  • the flaps 62 are lowered by the means of actuation and control 63 so that the bottom part 24 of the crosscutting saw goes free from the input and output conveyors 17, 18 respectively.
  • the upper 23 and lower 24 parts are coupled together by the upper part 23 being lowered by the means of lifting 9 so that it makes contact with the lower part 24 and the pins 71 and recesses 72 of the means of coupling are brought to engage with each other.
  • the coupling together is completed by the locking arm 74 of the means of locking 73 being moved to its locked position.
  • the crosscutting saw is hereby reset by the means of driving 29 being activated and both the cutting and transport units 18 being moved sideways to their desired positions along the first and second horizontal frame parts 3, 4 and secured in the desired positions by the means of locking 34.
  • the upper 23 and lower 24 parts must be disengaged and separated from each other vertically. This is so that the lengths of wood are able to pass between the meeting upper and lower parts 40, 55 of the pairs of transport elements 35, 36.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)

Claims (15)

  1. Vorrichtung zum Quertrennen von länglichen Holzstücken (15), die rechtwinklig im Verhältnis zu ihren Längen transportiert werden, umfassend einen Rahmen (1, 3, 4), der eine Anzahl von voneinander beabstandeten Schneid- und Transporteinheiten (19) trägt, die quer zur Transportrichtung der länglichen Holzstücke (15) angeordnet sind, wobei jede Schneid- und Transporteinheit einen oberen Teil (23) und einen unteren Teil (24) umfasst, die in einem Abstand voneinander oberhalb bzw. unterhalb der transportierten länglichen Holzstücke positioniert sind, wobei die Transportmittel (21) einen Teil des sowohl oberen als auch des unteren Teils bilden, und die durch eine relative Wechselwirkung die länglichen Holzstücke in der Transportrichtung zwischen dem oberen und dem unteren Teil zuführen, ein Schneidmittel (20) zum Schneiden der zwischen dem oberen und dem unteren Teil passierenden länglichen Holzstücke, wobei das Transportmittel (21) ein erstes und zweites kontinuierliches laufendes Transportelement (35, 36) umfasst, die übereinander angeordnet sind und parallel zueinander verlaufen, wobei das zweite Transportelement (36) auf dem unteren Teil (24) montiert und durch ihn abgestützt ist, und wobei die kontinuierlichen laufenden Transportelemente neben dem wirksamen Schneidteil des Schneidmittels (20) positioniert sind, dadurch gekennzeichnet, dass das erste Transportelement (35) durch ein Gestell (52) abgestützt ist, welches auf dem oberen Teil (23) drehbar montiert ist, um die Änderung des Abstands zwischen einem aneinanderstoßenden oberen und unteren Teil (55, 40) der Transportelemente (35, 36) zu erleichtern, und dass jedes des ersten und zweiten Transportelements (35, 36) ein elastomeres Reibmaterial umfasst, wobei die länglichen Holzstücke (15) zwischen dem aneinanderstoßenden oberen und unteren Teil (55, 40) der Transportelemente unter der Einwirkung des Reibmaterials vorwärts geführt werden.
  2. Vorrichtung nach Anspruch 1, wobei das erste und zweite Transportelement (35, 36) als ein Paar angeordnet sind, dessen parallel verlaufendes oberes und unteres Teil (55, 40) auf jeder Seite des wirksamen Schneidteils des Schneidmittels (20) positioniert sind.
  3. Vorrichtung nach Anspruch 2, wobei eines der kontinuierlichen laufenden Transportelemente (35) im oberen Teil (23) positioniert ist und elastische Gurte oder Riemen umfasst, während das zweite Transportelement (36) im unteren Teil (24) positioniert ist und mit einem Reibmaterial, wie etwa Gummi, bedeckte Transportketten umfasst.
  4. Vorrichtung nach Anspruch 3, wobei die Gurte oder Riemen mit einem Reibmaterial wie etwa Gummi bedeckt oder beschichtet sind.
  5. Vorrichtung nach Anspruch 3, wobei die Gurte oder Riemen als schlauchartige mit einem Gas oder einer Luft gefüllte Hohlkörper ausgeführt sind, um eine gute Elastizität und Nachgiebigkeit der länglichen Holzstücke zu gewährleisten.
  6. Vorrichtung nach irgendeinem der Ansprüche 1-5,
    dadurch gekennzeichnet, dass das Schneidmittel (20) ein Sägeblatt (44) umfasst, dessen wirksames zum Schneiden der länglichen Holzstücke (15) dienendes Teil zwischen dem Paar von Transportelementen (36) des unteren Teils (24) angebracht ist.
  7. Vorrichtung nach irgendeinem der Ansprüche 1 - 6, wobei die kontinuierlichen und parallel zueinander verlaufenden Transportelemente (35, 36) im Transportmittel (21) durch Platten (42) an ihrem aneinanderstoßenden oberen und unteren Teil (55, 40) abgestützt sind.
  8. Vorrichtung nach irgendeinem der Ansprüche 1 - 5, wobei der obere Teil (23) ein Verbindungsarmsystem (51) umfasst, wobei das Gestell (52) drehbar montiert ist und sowohl eines der Transportelemente (35) als auch einen Motor (57) zum Antreiben derselben ebenso wie ein Federdruckmittel (61) zum Drehen des Gestells im Uhrzeigersinn zu dem oberen Teil/den oberen Teilen (40) des zweiten Transportelements (36) abstützt.
  9. Vorrichtung nach Anspruch 8, wobei das Federdruckmittel (61) in einer Aufwärtsrichtung vom unteren Teil (24) zum Aufnehmen der Dickenabweichungen der transportierten länglichen Holzstücke (15) folgsam ist.
  10. Vorrichtung nach irgendeinem der vorhergehenden Ansprüche, umfassend ein Mittel zum Halten und Führen (26, 47), mit dem der obere Teil (23) und der untere Teil (24) am Rahmen (1, 3, 4) quer zur Transportrichtung der länglichen Holzstücke jeweils beweglich sind, Verriegelungsmittel (34, 47), mit denen der obere Teil und der untere Teil in festgelegten Positionen am Rahmen jeweils verriegelbar sind.
  11. Vorrichtung nach irgendeinem der vorhergehenden Ansprüche, wobei der Rahmen einen ersten horizontalen Rahmenteil (3), der den oberen Teil (23) der Schneid- und Transporteinheit (19) abstützt, einen zweiten horizontalen Rahmenteil (4), der unterhalb des ersten Rahmenteils angebracht ist und den unteren Teil (24) der Schneid- und Transporteinheit abstützt, ein Mittel zum Halten und Führen (5), mit dem der erste horizontale Rahmenteil für die vertikale Auf- und Abbewegung an vertikalen Rahmenteilen (1) im Rahmen geführt wird, Hebemittel (9) zum Anheben und Absenken des ersten horizontalen Rahmenteils und dadurch Änderung des relativen Abstands zwischen dem oberen und unteren Teil der Schneid- und Transporteinheit, ein Kopplungsmittel (70) umfasst, welches ermöglicht, dass der obere und der untere Teil zusammenführbar sind, um einen Kontakt herzustellen und für eine unverzügliche gemeinsame Bewegung der Teile entlang der horizontalen Rahmenteile miteinander gekoppelt werden können.
  12. Vorrichtung nach Anspruch 11, umfassend ein Antriebsmittel (29), mit dem der obere Teil (23) und der untere Teil (24) in ihrer durch das Kopplungsmittel (70) angekoppelten Position entlang des ersten und zweiten horizontalen Rahmenteils (3, 4) beweglich sind.
  13. Vorrichtung nach Anspruch 12, wobei das Antriebsmittel (29) einen Motor (30) umfasst, der durch den unteren Teil (24) mit einem Getrieberad (32) abgestützt ist, welches auf einer Welle (31) angeordnet ist, die mit einer auf dem unteren zweiten horizontalen Rahmenteil (4) angeordneten Zahnstange (33) zusammenwirkt.
  14. Vorrichtung nach irgendeinem der vorhergehenden Ansprüche 12 - 13, wobei eine erste Gruppe von hoch- und herunterklappenden Laschen (62) zusammen mit dem Transportmittel (21) auf beiden Seiten desselben angeordnet ist, und welche Laschen jeweils ein kontinuierliches laufendes motorisches Transportelement (69) umfassen, wobei die Laschen in einer ihrer Steuerpositionen die Förderung der länglichen Holzstücke (15) aus einer benachbarten Fördereinrichtung in das Transportmittel (21) ermöglichen, und den Schneid- und Transporteinheiten (19) mit den Laschen in ihrer zweiten Steuerposition ermöglicht wird, sich von den benachbarten Fördereinrichtungen zu befreien, damit sich die Schneid- und Transporteinheiten über das Antriebsmittel (29) auf dem ersten und zweiten horizontalen Rahmenteil (3, 4) des Rahmens frei bewegen können.
  15. Vorrichtung nach Anspruch 14, umfassend andere hoch- und herunterklappende Laschen (67), die zwischen einer der ersten oder zweiten Gruppe von hoch- und herunterklappenden Laschen (62) und dem Transportmittel (21) angebracht sind, wobei die anderen Laschen am unteren Teil (24) gelenkig befestigt sind und jeweils ein motorisches kontinuierliches laufendes Transportelement (69) umfassen, wobei das Schneidmittel (20) bei den hochgeklappten Laschen zugänglich ist.
EP04030431.3A 2004-12-22 2004-12-22 Vorrichtung zum Quertrennen von länglichen Holzstücken Expired - Fee Related EP1674221B1 (de)

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DE102013108909B4 (de) * 2013-08-19 2017-02-16 Gebrüder Linck Maschinenfabrik "Gatterlinck" GmbH & Co. KG Vorrichtung und Verfahren zum Zerlegen von Brettern oder Balken
PL236457B1 (pl) * 2018-03-22 2021-01-25 Drozdowski Stefan Zakl Metalowy Urządzenie do odbioru przetartej kłody
CN108327014A (zh) * 2018-04-12 2018-07-27 柯华平 一种竹木板加工设备
CN108858472A (zh) * 2018-07-06 2018-11-23 德清亿康木业有限公司 一种快速锯木机
CN114102764A (zh) * 2021-12-07 2022-03-01 河北环境工程学院 一种建筑房建木条切割装置

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