JP2019168166A - Veneer drying device - Google Patents

Abstract

To prevent a foreign material such as cutting chips and wood dust, adhering to a chain conveying a veneer from being ignited in a veneer drying device.SOLUTION: In a veneer drying device 10 which is configured so as to expose a veneer to hot wind and dry while being conveyed from an inlet 12 to an outlet 13 of a dry chamber by conveyance means 14 having a chain 15 circulating inside and outside the dry chamber 11, foreign material removing means 24 for removing a foreign material derived from the veneer, and adhering to the chain is provided in a place where the chain comes from the dry chamber, especially an inlet side. The foreign material removing means has a wire brush 27 abutting on the lateral face of the chain, and can adjust abutting pressure by an air cylinder 26. The foreign material removed from the chain falls down and is collected in a tray 18 (foreign material housing means) provided below the device.SELECTED DRAWING: Figure 3

Description

The present invention relates to a veneer drying apparatus used for adjusting a moisture content suitable for a subsequent bonding process and product quality from a veneer cut from a raw wood by a rotary race or the like.

As such a veneer drying apparatus, a so-called roller dryer is widely used which is dried by applying hot air while conveying the veneer while being sandwiched between rollers driven by a chain. It is known.

In a veneer dryer, foreign matter such as chip chips and wood powder falls during transportation of the veneer and is left in various places in the device, so these foreign matters are gradually carbonized by exposure to hot air. In the end, there is a risk of fire. In order to solve this problem, the following Patent Document 2 proposes that a dust removing device for removing these foreign substances and transferring them to the storage chamber in the vicinity of the single plate inlet of the single plate drying apparatus is proposed. .

Japanese Patent No. 5490499 Utility Model Registration No. 2546774

However, in Patent Document 2, it is proposed to remove foreign matters that are detached from the single plate during transfer of the single plate and fall and stay below the apparatus, but foreign matters such as chips and wood powder fall from the single plate. Not only does it adhere to the chain that drives the roller. Since machine oil is applied to the chain for lubrication and rust prevention, the chain circulates in the apparatus in a state in which foreign matter derived from a single plate adheres to the machine oil of the chain. In particular, since the softwood veneer contains more oil such as spider than the hardwood veneer, a larger amount of foreign matter derived from the veneer tends to adhere to the chain.

The inside of the veneer dryer is in a low-oxygen state, so even if foreign matter adheres to the chain, it will not ignite in the device, but hot air will flow while the foreign matter attached to the chain is transported inside the device. When exposed to air and exposed to air when exposed to high temperatures, this foreign object could ignite, resulting in a fire accident.

Therefore, the problem to be solved by the present invention is to prevent foreign matter such as chips and wood powder adhering to the chain carrying the veneer in the veneer drying apparatus from being ignited.

In order to solve the above-mentioned problem, the present invention according to claim 1 exposes the veneer to hot air while the veneer is conveyed from the inlet to the outlet of the drying chamber by the conveying means having a chain circulating inside and outside the drying chamber. In the veneer drying apparatus configured to be dried, a foreign matter removing means for removing foreign matter derived from the veneer attached to the chain is provided at a position where the chain comes out of the drying chamber.

According to a second aspect of the present invention, in the single-plate drying apparatus according to the first aspect, the foreign matter removing means is provided in the vicinity of at least the entrance of the drying chamber.

According to a third aspect of the present invention, in the veneer drying apparatus according to the first or second aspect, the foreign matter removing means has a contact member that contacts the side surface of the chain.

The present invention according to claim 4 is the veneer drying apparatus according to claim 3, wherein the contact member is a wire brush.

According to a fifth aspect of the present invention, in the veneer drying apparatus according to the third or fourth aspect, the foreign matter removing means includes pressure adjusting means for adjusting a pressure at which the abutting member abuts against a side surface of the chain. And

According to a sixth aspect of the present invention, in the veneer drying apparatus according to any one of the first to fifth aspects, there is provided a foreign matter containing means for containing the chain-attached foreign matter that is removed by the foreign matter removing means and falls. To do.

According to the first aspect of the present invention, machine oil applied to the chain for lubrication and rust prevention, especially chips and wood powder attached to the chain due to oil such as spear contained in a large amount of softwood veneer. Since the foreign matter derived from the veneer can be removed by the foreign matter removing means, foreign matter that has been exposed to hot air in the drying chamber and has reached a high temperature will ignite when it comes out of the drying chamber together with the chain and touches the outside air. To prevent.

According to the second aspect of the present invention, the foreign matter is removed by the foreign matter removing means provided on the inlet side of the drying chamber, and the chain enters the drying chamber without any extra foreign matter attached. Can be more effectively prevented from firing.

According to the third aspect of the present invention, the abutment member can be brought into contact with the side surface of the chain to effectively remove foreign matter adhering to the chain.

According to the fourth aspect of the present invention, since the wire brush comes into contact with the unevenness of the side surface of the chain, foreign matters attached to the chain can be effectively removed.

According to the fifth aspect of the present invention, the pressure when the abutting member comes into contact with the side surface of the chain can be optimally adjusted by the pressure adjusting means such as an air cylinder. Can be removed.

According to the sixth aspect of the present invention, the foreign matter removed from the chain by the foreign matter removing means is accommodated in the foreign matter containing means such as a tray, so that it can be easily removed from the apparatus.

It is a side view which shows roughly the whole structure of the veneer drying apparatus by one Embodiment of this invention. It is the A section enlarged view in FIG. FIG. 3 is a top view of FIG. 2. It is a side view which expands and shows the 1 step | paragraph veneer conveyance means and conveyance path | route shown by FIG. It is the C section enlarged view in FIG. It is the D section enlarged view in FIG. It is the B section enlarged view in FIG. FIG. 8 is a top view of FIG. 7.

With reference to FIG. 1 thru | or FIG. 8, the structure of the veneer drying apparatus 10 by one Embodiment of this invention is demonstrated. This veneer drying apparatus 10 feeds a veneer cut from a log with a rotary race or the like into the drying chamber 11 from the inlet 12 (part A, FIG. 2) of the drying chamber 11 and dries hot air in the drying chamber 11. Then, it is sent out from the outlet 13 (B section, FIG. 3). The veneer 1 (FIGS. 2, 4, and 7) is transported in a substantially horizontal direction by the transport device 14 from the inlet 12 to the outlet 13 of the apparatus main body 11. The humidity in the drying chamber 11 is maintained at 30 to 40%.

In particular, as shown in FIG. 4, the conveying device 14 is driven by a driving means (not shown) such as a motor and circulates inside and outside the drying chamber 11, and is arranged on the chain 15 at a predetermined interval. It has the lower roller 16 and the upper roller 17 arrange | positioned upwards facing the lower roller 16 on both sides of the single plate 1. Cams (not shown) are fixed to both ends of the lower roller 16 and the upper roller 17, and the lower roller 16 and the chain 15 are engaged with the chain 15 that comes out of the drying chamber 11 by the cam of the lower roller 16. The upper roller 17 rotates in the opposite direction at the same speed as the lower roller 16 as the cams of the lower roller 16 and the upper roller 17 mesh with each other. The veneer 1 is sandwiched between the lower roller 16 and the upper roller 17 and conveyed at a predetermined speed in the arrow X direction.

The lower roller 16 is provided over a relatively long region reaching the inlet 12 of the drying chamber 11, whereas the upper roller 17 is provided only in a region close to the inlet 12 of the drying chamber 11 (region shorter than the lower roller 16). It has been. With this configuration, the veneer 1 is placed on the lower roller 16 and conveyed, and then further conveyed in a state of being sandwiched between the front of the inlet 12 of the drying chamber 11 and the upper roller 17. It is sent into the drying chamber 11, passes through the drying chamber 11, and is sent out from the outlet 13. Since the veneer 1 is conveyed in the drying chamber 11 while being sandwiched from above and below by the rollers 16 and 17, even if it is exposed to hot air in the drying chamber 11, generation of warpage and wrinkles is prevented or suppressed.

The drying chamber 11 is provided with a multi-stage (six-stage in the illustrated embodiment) single-plate conveyance path so that a plurality of single-plates 1 can be dried at the same time. A transport device 14 as shown in FIG. 4 is provided for the transport path. 2 and 7, the chain 15 shown on the upper side of the transport device 14 of each stage moves from the outlet 13 toward the inlet 12, and the chain 15 shown on the lower side moves from the inlet 12 toward the outlet 13. . Moreover, the conveyance surface of the single plate 1 by the conveyance device 14 at each stage is indicated by a dotted line as a symbol T.

In the drying chamber 11, a heater zone 19 having a steam pipe (not shown) is provided above the multistage transport path by the transport device 14. Further, the heater zone 19 is provided with an intake duct 20, an intake fan 21, a hot air fan 22 and an exhaust duct 23. The air in the drying chamber 11 is heated by an erotic fin heater (not shown) in the drying chamber 11 by high-temperature steam generated by a boiler (not shown), and is sent downward by the hot air fan 22 to be conveyed by the conveying device 14. The veneer 1 conveyed by is dried by heating. A portion of the hot air dampened by drying the veneer 1 is discharged to the outside from the exhaust duct 23, and the hot air remaining in the drying chamber 11 is heated again and circulates in the heater zone 19.

In this way, the veneer 1 is dried with hot air while being transported through the drying chamber 11 from the inlet 12 to the outlet 13 by the transport device 14 and adjusted to a moisture content suitable for the subsequent bonding process and product quality. Is done. Although not shown, a cooling zone may be provided in the vicinity of the outlet 13 of the drying chamber 11.

In the veneer drying apparatus 10 having the basic configuration described above, it moves together with the chain 15 in a state where it adheres to machine oil pre-applied to the chain 15 and particularly oil such as spear contained in a large amount in the case of a softwood veneer. In order to prevent foreign matter (chips, wood powder, etc.) derived from a single plate from being heated to a high temperature and ignited, a place where the chain 15 circulating through the drying chamber 11 comes out of the drying chamber 11 (inlet 12 and / or Alternatively, the outlet 13, or the inlet 12 in this embodiment, is provided with a foreign substance removing means 24 for removing foreign substances adhering to the chain 15. According to this foreign matter removing means 24, foreign matter is removed from the upper chain 15 (moved from the outlet 13 to the inlet 12) coming out of the drying chamber 11 at the inlet 12 of the drying chamber 11, and machine oil is applied at the inlet 12. After that, the lower chain 15 enters the drying chamber 11 again from the inlet 12 and moves toward the outlet 13. Since the foreign matter is removed before the machine oil is applied, the foreign matter can be efficiently removed without wasting the machine oil.

As shown in detail in FIGS. 4 and 5, the foreign matter removing means 24 according to this embodiment is fixed to a frame 25 having a sufficient height over a single plate conveyance path provided in multiple stages via air cylinders 26. The plurality of wire brushes 27 are configured. The wire brush 27 is provided at a height position that abuts on the side surface of the chain 15 provided in the single plate conveyance path of each stage, and a predetermined pressure (0.1 to 0.3 MPa, preferably 0.2 MPa) by the air cylinder 26. ) Makes contact with the side surface of the chain 15 so that the foreign matter adhering to the chain 15 is efficiently removed. The foreign matter removed from the chain 15 by the wire brush 27 falls, is captured and accommodated in the tray 18 disposed below the position where the wire brush 27 contacts the chain 15, and is automatically or manually discharged as appropriate. When the position where the wire brush 27 contacts the chain 15 is different in the transport direction, a plurality of trays 18 are provided according to the position.

A member that removes the adhered foreign matter in contact with the side surface of the chain 15 is not limited to the wire brush 27, but a scraper or the like can be used. However, the foreign matter attached to the uneven surface of the chain 15 can be effectively removed. In that respect, the use of a wire brush 27 is preferred.

In the illustrated embodiment, the wire brush 27 is brought into contact with the outer surface of the chain 15 to remove the adhered foreign matter, but instead of or in addition to this, the inner surface of the chain 15 is contacted. You may provide the wire brush 27 so that it may contact.

In the veneer drying apparatus 10 of the illustrated embodiment, the foreign matter removing means 24 is provided at the inlet 12 of the drying chamber 11, but similar foreign matter removing means 24 may be provided at both the inlet 12 and the outlet 13. If the chain 15 with the extraneous foreign matter attached enters the drying chamber 11 as it is, there is a high risk of igniting by touching the outside air when exiting from the outlet 13 after being exposed to hot air in the drying chamber 11, In order to prevent this effectively, the foreign matter removing means 24 is preferably provided on the inlet 12 side when provided only on one of the inlet 12 and the outlet 13.

In the veneer drying apparatus 10 of the illustrated embodiment, the above-mentioned foreign matter removing means for scraping off the foreign matter attached to the chain 15 with the wire brush 27 in order to prevent the foreign matter derived from the single plate attached to the chain 15 from igniting. In addition, the chain 15 that circulates in the drying chamber 11 is provided at a position where the chain 15 exits from the drying chamber 11 (inlet 12 and / or outlet 13, in this embodiment, inlet 12 and outlet 13). The water injection means 28 which injects water toward 15 is provided (see FIGS. 3 and 8). Since the water injection means 28 provided on the inlet 12 side and the water injection means 28 provided on the outlet 13 side have substantially the same configuration, the water injection means 28 provided on the inlet 12 side will be described with reference to FIG. I will explain.

The water spray means 28 includes a steam pipe 29 extending in the height direction over a single plate conveyance path provided in multiple stages, and a steam ejection nozzle provided in connection with the steam pipe 29 in each stage of the single plate conveyance path. 30 and an adjustment handle 31, and the steam fed from the steam pipe 29 is ejected from the steam ejection nozzle 30 toward the side surface of the chain 15 at a desired ejection pressure (for example, 0.2 MPa) adjusted by the adjustment handle 31. It is configured as follows. As a result, even if foreign matter adheres to the chain 15, the amount of moisture can be increased, thereby preventing the risk of ignition. Although it is conceivable to spray water or mist only for the purpose of preventing ignition of the foreign matter adhering to the chain 15, heat is taken away from the drying chamber 11 and adversely affects the heat drying of the veneer 1 due to the temperature drop. Therefore, it is preferable to spray water vapor having a high temperature (about 100 ° C.) close to the temperature in the drying chamber 11.

Although the present invention has been described in detail with reference to examples, the present invention is not limited to this, and can be implemented with various modifications or changes within the scope of the invention defined by the description of the scope of claims. is there. In the illustrated embodiment, a transport device provided with a roller that moves and rotates together with a chain that circulates inside and outside the drying chamber is used. However, the present invention is not limited thereto, and the chain has a chain that circulates inside and outside the drying chamber. The present invention can be applied to any conveyance device.

DESCRIPTION OF SYMBOLS 1 Single plate 10 Single plate drying apparatus 11 Drying chamber 12 Drying chamber inlet 13 Drying chamber outlet 14 Conveying device (conveying means) 15 Chain 16 Lower roller 17 Upper roller 18 Tray (foreign matter accommodation means) 19 Heater zone 20 Intake duct 21 Intake fan 22 Hot air fan 23 Exhaust duct 24 Foreign matter removing means 25 Frame 26 Air cylinder (pressure adjusting means) 27 Wire brush (contact member) 28 Moisture ejecting means 29 Steam pipe 30 Steam ejecting nozzle 31 Adjusting handle

Claims (6)

In a veneer drying apparatus configured to be dried by being exposed to hot air while a veneer is conveyed from an inlet to an outlet of a drying chamber by a conveying means having a chain circulating inside and outside the drying chamber, A single plate drying apparatus, wherein a foreign material removing means for removing foreign material derived from a single plate attached to the chain is provided at a position where the water comes out of the drying chamber. 2. The veneer drying apparatus according to claim 1, wherein the foreign matter removing means is provided in the vicinity of at least the entrance of the drying chamber. 3. The veneer drying apparatus according to claim 1, wherein the foreign matter removing means has a contact member that contacts a side surface of the chain. 4. The veneer drying apparatus according to claim 3, wherein the contact member is a wire brush. 5. The veneer drying apparatus according to claim 3, wherein the foreign matter removing means has pressure adjusting means for adjusting a pressure at which the abutting member abuts against a side surface of the chain. 6. The veneer drying apparatus according to claim 1, further comprising foreign matter storage means for storing the chain-attached foreign matter that is removed by the foreign matter means and falls.