JP2007001015A - Wood barking apparatus using dry ice blast and wood barking method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate the complicatedness of blast material treatment after use by preventing the occurrence of the damage, deterioration, etc. of a wood barking apparatus and the problem wherein the water content of wood increases after barking treatment in the wood barking apparatus, and the wood barking method. <P>SOLUTION: The wood barking apparatus using a dry ice blast is equipped with a rotary means for rotating wood using the axis extending in its longitudinal direction as a rotary axis and a dry ice particle jet nozzle for blasting dry ice particles against the outer peripheral surface of the wood rotated by the rotary means. In the wood barking method using the dry ice blast, the dry ice particles used as a blast material are blasted against the outer peripheral surface of the wood rotated around the axis extending in its longitudinal direction by the rotary means to bark the wood. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an apparatus and method for peeling off wood by dry ice blasting using dry ice particles as a blasting material.

  Known peeling machines for wood include a peeling machine with a peeling blade on the rotor and a ring barker with a cutter blade attached to the ring. However, a peeling machine using a peeling blade or a cutter blade is known. Then, the problem of the damage of the blade body by contact of blades and the deterioration damage of the blade by use arises.

Therefore, a technique has been proposed in which a plurality of arms with cutter blades are arranged on the ring so as to be swingable, and adjacent arms are arranged back and forth to prevent damage due to contact between the blades. (For example, refer to Patent Document 1).
Japanese Patent Laid-Open No. 07-1117016

  However, although the ring barker described in Patent Document 1 can avoid contact between the blade bodies, damage and deterioration due to the use of the blade bodies cannot be avoided.

  In the water jet peeling machine using ultra-high pressure water, the above-mentioned problem of blade damage damage does not occur, but the post-treatment of wood and bark with increased moisture content takes time and further becomes sludge. This causes a problem that an excessive burden is imposed on the blasting material treatment after use. Peeling by the sandblasting method is also conceivable, but the labor and cost required for the treatment of blasting sand after use, which also contains dust, are excessive.

  The present invention suppresses damage deterioration of the apparatus and does not cause problems of damage to the apparatus such as blade damage deterioration described above, an increase in moisture content, and complicated blasting material treatment after use, and has high work efficiency. An object of the present invention is to provide a skin peeling apparatus and a skin peeling method.

  In order to solve the above-mentioned problems, a wood peeling apparatus using dry ice blast proposed by the present invention is rotated by a rotating means for rotating the wood around an axis extending in the longitudinal direction thereof, and the rotating means. A dry ice particle ejection nozzle for spraying dry ice particles on the outer peripheral surface of the wood is provided.

  For example, the rotating means can be configured to support one end and the other end of the wood in the longitudinal direction and rotate the wood thus supported as an axis extending in the longitudinal direction. . Moreover, it is desirable to have a function of moving the wood in the direction of the axial center extending in the longitudinal direction while rotating in this way.

  While rotating wood with such a rotating device, dry ice particles as nozzles are blown from the dry ice particle jet nozzle to the outer peripheral surface of the wood to peel the wood, so a dry ice particle jet nozzle is provided. You can peel the entire circumference of the wood while keeping the position in place.

  Also, by adopting a rotating device that also has a function of moving the wood in the direction of the axis extending in the longitudinal direction while rotating the wood, the position where the dry ice particle ejection nozzle is arranged is fixed. The entire skin of the wood can be peeled over the entire length of the wood.

  The dry ice particle ejection nozzle sprays dry ice particles as a blast material onto the outer peripheral surface of the rotating wood with high-pressure gas.

  For example, the high-pressure gas is provided with dry ice particle supply means for supplying dry ice particles used as a blasting material for peeling wood, and high-pressure gas supply means for supplying high-pressure gas for pumping the dry ice particles. The dry ice particles that have been fed under pressure can be sprayed from the outer peripheral surface of the rotating wood from the dry ice particle ejection nozzle.

  The bark on the wood surface is peeled off by the action of the impact force applied to the wood by spraying the dry ice particles pumped by the high pressure gas onto the outer peripheral surface of the wood from the dry ice particle jet nozzle as a blast material. The surface of the wood is rapidly cooled by the sprayed dry ice particles, and the temperature change at that time enhances the effect of peeling the bark.

  In addition, as described above, dry ice particles are sprayed from the dry ice particle ejection nozzle to the outer peripheral surface of the wood while rotating the wood by the rotating means, so even if there is a bark portion that is not peeled off by the first blowing, The portion is cooled and solidified by the sprayed dry ice particles, and again faces the dry ice particle ejection nozzle by rotation and receives the spray of dry ice particles. Therefore, the impact force of the dry ice particles is applied again here, and the bark portion that was not peeled off by the first spraying as described above is also crushed and peeled off.

  In addition, by using dry ice particles as a blast material, dry ice particles blown to the outer peripheral surface enter the bark portion and rapidly vaporize to increase its volume. Therefore, the gap can be widened by this volume change, and the bark can be easily peeled off.

  Furthermore, since the dry ice particles are immediately converted into a gas by sublimation, the moisture content does not increase in the wood from which the bark has been peeled off and the peeled bark, and the problem of complicated treatment of the blasting material after use does not occur.

  In the above, the high-pressure gas for pumping dry ice can be used by compressing air taken from outside air. In this case, it is preferable to remove moisture in the air moderately by a dehumidifier or the like. The solidification of water vapor contained in the outside air may cause solidified bonds between the dry ice particles, which may cause clogging of the nozzle tip, etc. Therefore, it is necessary to remove the water vapor to prevent this. Therefore, instead of using air taken from outside air, high-pressure gas containing no moisture such as nitrogen gas can be used.

  It is desirable that the rotation means can adjust the number of rotations according to the type and thickness of the wood, and can adjust the speed of movement in the axial direction.

  In addition, it is desirable that the spray pressure of the dry ice particles sprayed from the dry ice particle spray nozzle can be adjusted in order to spray the dry ice particles on the outer peripheral surface of the wood.

  The speed at which the wood is rotated, the speed at which the wood is moved in the longitudinal direction, and the spray pressure of the dry ice particles ejected from the dry ice particle ejection nozzle are respectively adjusted as appropriate to peel the bark under the most preferable conditions. it can.

  In the wood peeling apparatus using dry ice blasting according to the present invention, it is desirable that the dry ice particle ejection nozzle can change the angle at which the dry ice particles are sprayed on the outer peripheral surface of the wood. In this way, it becomes possible to spray dry ice particles at a desired location on the outer peripheral surface of the wood, for example, a position where the bark remains without being peeled, and the bark around the entire circumference of the wood can be easily left. It is advantageous in peeling off.

  It is desirable that the distance between the tip of the dry ice particle ejection nozzle and the outer peripheral surface of the wood be adjustable. This is advantageous because the bark can be easily peeled according to the thickness of the wood by changing the position facing the wood according to the thickness of the wood.

  As described above, the method of skinning wood by dry ice blasting proposed by the present invention uses dry ice particles to be used as a blasting material on the outer peripheral surface of wood rotating with an axis extending in the longitudinal direction as a rotation axis. The wood is peeled off by spraying. This method can be performed using the above-described wood peeling apparatus using dry ice blasting according to the present invention.

  According to the present invention, since dry ice is used as a blasting material, wood can be peeled without causing damage to the blade body, which has been a problem in conventional skinning devices and methods. . Further, since dry ice particles are instantly gasified by sublimation, the moisture content does not increase in the wood from which the bark has been peeled off and the peeled bark, and the problem of complicated blasting treatment after use does not occur. That is, it is possible to suppress deterioration of the apparatus and improve work efficiency when peeling wood.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a conceptual plan view for explaining an example of a wood peeling apparatus using dry ice blasting according to the present invention, and FIG. 2 is a conceptual sectional view thereof.

  In the illustrated embodiment, a wood peeling device (hereinafter referred to as a “skinning device”) 1 by dry ice blasting 1 is a rotating device 3 that mainly supports and rotates wood 2 carried in, and dry ice particles that are blasting materials. Dry ice particle supply devices 4a and 4b, a compressor 5 for generating compressed air for pumping dry ice particles, and dry ice particle ejection nozzles 6a and 6b for blowing dry ice particles to the rotating wood 2 I have.

  The rotating device 3 that is a rotating means sandwiches and supports one end and the other end of the wood 2 that is the log-shaped raw wood that is carried in, and rotates the wood 2 about the axis extending in the longitudinal direction of the wood 2 as a rotation axis. Is.

  In the illustrated structure of the rotating device 3, a motor 7 is provided on one end side, and a spindle 9 is connected to the motor 7 via a coupling 8.

  The spindle 9 is inserted into a cylindrical rotating shaft 10 from one end side, and the rotating shaft 10 can be moved back and forth in the axial direction by the rotation of the spindle 9 (moving in the left and right direction in FIG. 1). It has a structure. This structure is a well-known technique. For example, a structure in which a spiral groove is formed on the rotating shaft 10 and a member that engages with the groove is provided on the spindle 9 can be adopted.

  Since the other end side of the rotating shaft 10 is brought into contact with the cut surface of the log-like wood 2 to be carried in, in this embodiment, it is flat.

  A motor 11 is provided on the other end side of the rotating device 3, and a spindle 12 is connected to the motor 11 via a transmission 19. The spindle 12 is inserted into the cylindrical rotating shaft 13 from one end side, and the rotating shaft 13 can be moved back and forth in the axial direction by the rotation of the spindle 12 (moving in the left and right direction in FIG. 1). It has become. The back-and-forth movement structure can be the same as that of the rotary shaft 10 described above.

  Since the other end side of the rotating shaft 13 is brought into contact with the cut surface of the wood 2 to be carried in, in this embodiment, it is flat.

  In this way, the wood 2 to be peeled by the rotary shaft 13 and the rotary shaft 10 is sandwiched from both ends thereof. The holding and releasing of the wood 2 is performed by moving the rotary shafts 10 and 13 in the front-rear direction (left-right direction in FIG. 1).

  In the illustrated embodiment, the rotating device 3 is provided over the inside and outside of the housing 14, and supports and rotates the wood, and the longitudinal direction of the wood (left and right in FIG. 1), that is, the shaft extending in the longitudinal direction of the wood. The movement in the direction of the heart and the skinning process described later are performed inside the housing 14.

  Specifically, the motor 7, the coupling 8, and the spindle 9 on one end side of the rotating device 3 are provided outside the housing 14, and the rotating shaft 10 moves in the front-rear direction (left-right direction in FIG. 1). To move inside and outside through the housing 14.

  On the other hand, the motor 11, the transmission 19, the spindle 12, and the rotating shaft 13 are provided in the housing 14 in the illustrated embodiment. The housing 14 and the rotary shafts 10 and 13 are engaged and connected by rolling bearings 15a and 15b, respectively.

  A stopper 16 that prevents over-insertion of the rotating shaft 13 is provided on the transmission 12 side as a device that assists the operation of the rotating device 3 inside the housing 14. Further, in order to support and rotate the wood 2 by the rotating shafts 10 and 13, a set of fixing bars 17a, 18a and 17b, 18b is provided to sandwich the ring member 20 provided on the rotating shaft 13, respectively. Yes. The operation of these auxiliary devices is controlled by a control device 25 described later.

  Further, in the inside of the housing 14, there is provided a wood transport arm 21 that carries the wood 2 to and from the rotating device 3 in the vicinity of a position where the wood 2 to be peeled is supported and rotated.

  A compressor 5 that generates high-pressure air for pumping dry ice particles is provided on one end side of the motor 7 positioned outside the housing 14. Further, dry ice supply devices 4a and 4b, which are dry ice particle supply means, are provided on both sides of the spindle 9.

  From the compressor 5, a high pressure air supply line is branched through a compressed air supply source valve 30 disposed in the middle, and communicates with the dry ice particle supply devices 4 a and 4 b. In the middle of the branched pipeline, pressure regulating valves 31a and 31b, pressure regulating valve inlet valves 32a and 32b, outlet valves 33a and 33b, and bypass valves 34a and 34b are provided in the branched pipelines. It has been.

  The dry ice particle supply devices 4a and 4b are devices for supplying pellet-shaped dry ice particles, which are blast materials, and pulverizing lump-shaped dry ice carried from the outside with a crusher to produce pellet-shaped dry ice particles In addition, the temperature and humidity are optimally adjusted so that the dry ice particles do not solidify and bond with each other.

  The dry ice particles supplied from the dry ice particle supply devices 4a and 4b are pumped through the pipeline to the dry ice particle ejection nozzles 6a and 6b in the housing 14 by high-pressure air. In the middle of this pipe line, check valves 36a and 36b, check valve pre-valves 37a and 37b, and pressure gauges 38a and 38b are provided, respectively.

  In the embodiment shown in FIG. 1, the dry ice particle ejection nozzles 6 a and 6 b are respectively disposed on both sides of the wood 2 that is supported and rotated by the rotating device 3.

  FIGS. 3A and 3B are examples illustrating a mode in which the dry ice particle ejection nozzle can change the angle at which the dry ice particles are sprayed onto the outer peripheral surface of the wood, and FIG. 1 is a side view as viewed from the right side in FIG. 1, and the nozzle tip 40 of the dry ice particle ejection nozzle 6b can change its spray angle within a range of 180 degrees (90 degrees each in the right and left in the figure). FIG. 3B is a front view seen from the front of FIG. 1, and the nozzle tip 40 of the dry ice particle ejection nozzle 6b has a spray angle of 90 degrees (45 degrees each in the right and left in the figure). Can be changed. The dry ice particles are ejected, for example, linearly from the nozzle tip 40 of the dry ice particle ejection nozzle 6b as shown in the figure.

  The angle change as illustrated in FIGS. 3A and 3B of the nozzle tip 40 of the dry ice particle ejection nozzles 6a and 6b can be controlled by an operation from the control panel 25 described later.

  Further, the distance between the tip of the nozzle tip 40 of the dry ice particle ejection nozzles 6a and 6b and the outer peripheral surface of the wood 2 can be adjusted, and the change of this distance is also controlled by an operation from the control panel 25, and the wood. Depending on the thickness, material, etc., the optimum distance for the skinning can be selected.

  In this embodiment, a control panel 25 that controls the operation of the skinning device 1 is disposed outside the housing 14 on the opposite side of the compressor 5 with the motor 7 interposed therebetween.

  The control panel 25 controls the opening degree of the pressure control valves 31a and 31b in addition to the angle and position control of the nozzle tip 40 of the dry ice particle ejection nozzles 6a and 6b described above. Further, the indication values of the pressure gauges 38a and 38b (FIG. 1), the thermometer 50, the ammeter 51 (FIG. 2), and the rotation detector 52 (FIG. 1) of the rotation speed of the wood 2 and alarms based on the indication values. A generator can be built in.

  The control panel 25 can be set to automatic control, but can also be manually operated according to the state of the skinning process confirmed by the viewing window 41 provided on the wall surface of the housing 14.

  During the skinning process in the housing 14, dry ice particles as a blast material are ejected toward the outer peripheral surface of the wood 2 and then immediately sublimate to become gaseous carbon dioxide and stay in the lower portion of the housing 14. . In order to process this carbon dioxide, a vent 42, a vent pipe 43, a blower 44, and a vent pipe 43 are provided in this order in the casing 14 and further provided on the wall surface of the casing 14 toward the outside. To the exhaust port 45.

  Next, the operation of this embodiment will be described. The wood 2 that is a log-like raw wood carried into the housing 14 by the wood carrying arm 21 is supported with its both ends being sandwiched by the rotating device 3 and rotated in the direction of arrow 62 in FIG.

  Both end surfaces of the wood 2 placed at predetermined positions of the rotating device 3 are sandwiched between rotating shafts 10 and 13 that move back and forth in the directions of arrows 60 and 61 (FIG. 2) by the rotation of the spindles 9 and 12. As the motors 7 and 11 rotate, the wood 2 sandwiched between the rotary shafts 10 and 13 is rotated in the direction of the arrow 62 with an axis extending in the longitudinal direction as an axis.

  The air taken from outside air is dehumidified by a dehumidifier (not shown) and then compressed by the compressor 5. The generated compressed air pressure-feeds the dry ice particles supplied from the dry ice particle supply devices 4a and 4b to the dry ice particle ejection nozzles 6a and 6b via the pressure control valves 31a and 31b, respectively, by pipes.

  Dry ice particles are ejected from the dry ice particle ejection nozzles 6 a and 6 b arranged at both ends of the wood 2 rotated by the rotating device 3 and collide with the outer peripheral surface of the wood 2. The surface bark of the wood 2 is peeled off by the impact force sprayed with the compressed air compressed with dry ice particles. The bark remaining without being peeled off by the first ejection is also cooled and solidified by the dry ice particles, so that it comes again to the position facing the nozzles 6a, 6b by rotation, and the impact force of the dry ice particles is added there again, It is crushed and peeled off.

  In the skinning process performed using the dry ice particles as a blast material, the dry ice particle ejection nozzles 6a and 6b explain the angle of the nozzle tip 40 using, for example, FIGS. 3 (a) and 3 (b). Since it can be changed, the bark can be peeled off efficiently. Moreover, since the ejection position facing the wood 2 can be changed, it is possible to make an optimum setting according to conditions such as the thickness and material of the wood 2. Furthermore, these settings and adjustments including the setting of the rotation speed of the wood 2 are performed automatically and manually by the control panel 25.

  Thus, the dry ice particles are sprayed from the nozzle tip 40 of the dry ice particle jet nozzles 6a and 6b to the outer peripheral surface of the wood 2 while rotating the wood 2 in the direction of the arrow 62, and the entire outer periphery at a predetermined position in the longitudinal direction of the wood 2 If the peeling process of the longitudinal direction proceeds, the control unit 25 controls the rotary shafts 10 and 13 to move forward in the direction of the arrow 60 and move the wood 2 in this direction to perform the peeling process in the longitudinal direction. The skin is peeled over the entire length of the wood 2.

  The peeled bark falls in the vertical direction (the lower direction in FIGS. 1 and 2), is collected on the conveyor 56 by the bark collecting plate 55 (FIG. 2), and is carried out of the housing 14. The wood 2 after the skinning process is carried by a wood carrying arm 21 to a wood carrying conveyor (not shown).

  The dry ice particles after being sprayed on the outer peripheral surface of the wood 2 are sublimated and become carbon dioxide, and stay in the lower part of the housing 14. It is discharged out of the body 14. The dust in the discharged carbon dioxide is treated with a filter (not shown).

  Thus, according to the present invention, since dry ice particles are used as a blast material, it is possible to skin wood without causing problems such as damage to devices and machines as in conventional skin peeling devices. . Further, since dry ice particles become a gas by sublimation, the moisture content does not increase in the wood from which the bark has been peeled off and the peeled bark, and there is no problem of complicated treatment of the blasting material after use. In this way, the apparatus is not damaged and the post-treatment of the blast material can be performed efficiently.

  In this embodiment, compressed air obtained by compressing outside air is used as high-pressure air, but high-pressure nitrogen gas or the like may be used.

Conceptual plan view illustrating an example of a wood peeling apparatus using dry ice blasting according to the present invention FIG. 2 is a conceptual cross-sectional view of a wood peeling apparatus using the dry ice blast shown in FIG. 1. FIG. 1 illustrates an example in which a dry ice particle ejection nozzle can change the angle at which dry ice particles are blown onto the outer peripheral surface of wood, and (a) is a side view as viewed from the right side in FIG. 1. , (B) is a front view seen from the front of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wood peeling apparatus by dry ice blasting 2 Wood 3 Rotating device 4a, 4b Dry ice particle supply device 5 Compressor 6a, 6b Dry ice particle ejection nozzle 10, 13 Rotating shaft 14 Housing 25 Control panel

Claims (4)

  Dry ice comprising rotating means for rotating wood around an axis extending in the longitudinal direction thereof, and a dry ice particle ejection nozzle for blowing dry ice particles on the outer peripheral surface of the wood being rotated by the rotating means Wood peeling machine by blasting.   The dry ice blasting nozzle according to claim 1, wherein the dry ice particle ejection nozzle is capable of changing an angle at which the dry ice particles are sprayed on the outer circumferential surface of the wood.   The dry ice blasting device according to claim 1 or 2, characterized in that the distance between the tip of the dry ice particle ejection nozzle and the outer peripheral surface of the wood can be adjusted.   Dry ice blasting wood peel by spraying dry ice particles used as a blasting material on the outer circumferential surface of the wood rotating about a longitudinally extending axis as a rotation axis. Stripping method.

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