JP2015051829A - Ligneous pellet transfer device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ligneous pellet transfer device capable of preventing reduction of a transfer amount of a ligneous pellet due to extension amount reduction of a spring auger, and preventing a situation that combustion operation is stopped in powder cleaning.SOLUTION: A ligneous pellet transfer device 10 transfers the ligneous pellet stored in a tank 11 to a burner 21 of a warm wind machine 20 by rotation and telescopic motion of a spring auger 14 disposed in a transfer pipe 12, and has a box-shaped accumulation box 15 which has an opening 12b disposed on a lower side in the vicinity of the tank side end part of the transfer pipe 12, and which covers the opening 12b from outside of the transfer pipe 12.

Description

  The present invention relates to a wood pellet conveying apparatus.

  Conventionally, a wood pellet transport device that transports wood pellets has been proposed for a warm air machine that heats wood pellets by heating. Such a wood pellet transport apparatus is configured to store wood pellets as fuel in a tank made of, for example, FRP (Fiber Reinforced Plastics), and transport the wood pellets from the tank to the warm air machine through the transport apparatus.

  The wood pellet transport apparatus has a transport member in the transport pipe. As the conveying member, a screw conveyor or a spring auger (also referred to as a spirer) is employed, and the screw conveyor or the spring auger is rotated by a motor to convey the wood pellets. Moreover, since the spring auger has a metal coil spring shape, it is configured to convey the wood pellets by its expansion and contraction (see, for example, Patent Document 1).

JP 2005-121337 A

  Here, the wood pellet is a hardened wood chip. For this reason, some wood pellets break down into powder due to impact and dead weight when the tank is charged. However, since the spring auger is designed for the purpose of conveying solid pellets, it is not good at conveying powder. In particular, when the tank side end of the transport pipe is positioned below the warm air machine side end, powder that cannot be transported tends to accumulate at the tank side end of the transport pipe.

  And when powder accumulates in the tank side end of a conveyance pipe, the extension of a spring auger will be inhibited and the conveyance amount of a wood pellet will fall. Therefore, in such a case, the transportation operation of the wood pellet is stopped, the shutter at the inlet between the tank and the transport pipe is closed, and the end cap provided at the tank side end of the transport pipe is removed to remove the powder. It is necessary to perform the cleaning work to remove. During this cleaning operation, the combustion operation with the warm air fan cannot be performed.

  The present invention has been made to solve such a conventional problem, and an object of the present invention is to prevent a decrease in the transport amount of wood pellets due to a decrease in the elongation amount of the spring auger, and to clean the powder. An object of the present invention is to provide a wood pellet conveying device capable of preventing a situation in which the combustion operation stops.

  The wood pellet transport device of the present invention is a wood pellet transport device for transporting wood pellets stored in a tank to a burner by rotation and expansion / contraction of a spring auger provided in the transport tube, the tank side end of the transport tube Alternatively, an opening is formed on the lower side in the vicinity thereof, and a box-shaped collection box that covers the opening from the outside of the transport pipe is provided.

  According to this wood pellet conveying apparatus, since the opening is formed at the tank side end of the conveying pipe or the lower side in the vicinity thereof, the powder on the tank side of the conveying pipe is discharged out of the conveying pipe through the opening. . Therefore, it is possible to prevent a decrease in the transport amount of the wood pellets due to a decrease in the extension amount of the spring auger without inhibiting the expansion and contraction of the spring auger.

  Moreover, since the box-shaped accumulation box which covers the said opening from the outer side of a conveyance pipe is provided, the powder discharged | emitted out of the conveyance pipe will accumulate in an accumulation box. For this reason, the operator only has to clean the powder in the collection box, and it is not necessary to stop the transport of the wood pellets and the combustion operation in order to clean the inside of the transport pipe, and the combustion operation stops when cleaning the powder. The situation can be prevented.

  Moreover, in this wood pellet conveying apparatus, it is preferable that the opening is formed immediately below a charging port for supplying wood pellets from the tank to the conveying pipe.

  According to this wood pellet conveying apparatus, since the opening is formed directly below the inlet for supplying the wood pellets from the tank to the conveying pipe, the powder is kept flowing from the tank to the conveying pipe. It will go to the opening, and the powder can be smoothly accumulated in the collection box.

  Moreover, in this wood pellet conveying apparatus, it is preferable that the accumulation box is provided with a lid member that closes the cleaning port while a cleaning port for taking out the powder inside the box is formed.

  According to this wood pellet conveying apparatus, since the cleaning port for taking out the powder inside the box is formed, it is possible to easily clean from the cleaning port without attaching / detaching the accumulation box to / from the conveying tube, and to attach / detach Since there is no need to configure, the collection box can be fixed to the transport pipe by welding or the like, and rainwater can be prevented from entering.

  Moreover, it is preferable that this wood pellet conveying apparatus further includes a level sensor that detects that the amount of powder inside the accumulation box has reached a predetermined amount.

  According to this wood pellet conveying apparatus, since it further includes a level sensor that detects that the amount of powder inside the accumulation box has reached a predetermined amount, an alarm is issued when the amount of powder in the accumulation box exceeds a predetermined amount. It is possible to prevent forgetting cleaning by encouraging the operator to clean.

  ADVANTAGE OF THE INVENTION According to this invention, the wood pellet conveyance apparatus which can prevent the fall of the conveyance amount of the wood pellet resulting from the expansion amount reduction | decrease of a spring auger and can prevent the situation where a combustion driving | operation stops in powder cleaning is provided. be able to.

It is an external view which shows an example of a warm air system provided with the wooden pellet conveying apparatus which concerns on embodiment of this invention. It is the schematic which shows the tank side edge part and its vicinity of the conveyance pipe shown in FIG. It is the 2nd schematic diagram which shows the tank side edge part of the conveyance pipe | tube shown in FIG. 1, and its vicinity. It is the schematic which shows the mode at the time of powder deposition. It is sectional drawing of a conveyance pipe. FIG. 2 is an enlarged schematic view showing the vicinity of the collection box shown in FIG. 1. It is a schematic sectional drawing of a tank, a conveyance pipe, and a collection box.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings. FIG. 1 is an external view showing an example of a hot air system including a wood pellet conveying apparatus according to an embodiment of the present invention.

  As shown in FIG. 1, the hot air system 1 includes a wood pellet conveying device 10 and a hot air machine 20, and uses wood pellets, which are small solid fuels obtained by compression-molding lumber by-products such as sawdust and kana scraps. It conveys with respect to the burner 21 of the warm air machine 20. As shown in FIG. The wood pellets conveyed to the burner 21 are burned by the burner 21.

  Such a wood pellet transport apparatus 10 includes a tank 11, a transport pipe 12, and a motor 13. The tank 11 stores wooden pellets, and is formed of, for example, FRP or stainless steel. Further, as shown in FIG. 1, the tank 11 has a portion having an inverted conical shape that tapers downward, and the re-lower position that is the apex of the cone is connected to the transport pipe 12. It is a slot 11a.

  The conveyance pipe 12 is a cylindrical pipe that connects the tank 11 to the hot air fan 20, and a motor 13 is provided at an end of the hot air fan side. Moreover, as shown in FIG. 1, as for the conveyance pipe 12, the tank side edge part is located below the warm air machine side edge part.

  FIG. 2 is a schematic view showing the tank side end of the transfer pipe 12 shown in FIG. 1 and the vicinity thereof. As shown in FIG. 2, a spring auger 14 is installed inside the transport pipe 12.

  The spring auger 14 is a metal coil spring-shaped component, and the end on the warm air machine side is connected to the motor 13 and the end on the tank side is a free end. The spring auger 14 is rotated by a motor 13 serving as a drive source. Thereby, a wood pellet is conveyed from a tank side to a warm air machine side along a coil spring. Further, the spring auger 14 conveys the wood pellet to the burner 21 by its expansion and contraction (see FIGS. 2 and 3).

  FIG. 3 is a second schematic diagram showing the tank side end of the transfer pipe 12 shown in FIG. 1 and the vicinity thereof. Furthermore, the spring auger 14 can take the state shown in FIG. 2 and the state shown in FIG. That is, the spring auger 14 conveys the wood pellets from the tank side to the warm air machine side by an expansion and contraction operation that repeats the extended state shown in FIG. 2 and the compressed state shown in FIG. Thus, by shifting from the state shown in FIG. 2 to the state shown in FIG. 3, the wood pellets are transported so as to be pulled up to the warm air machine side.

  However, since wood pellets are made of hardened wood chips, some wood pellets break down into powder due to the impact and weight of the tank when it is thrown into the tank, and the powder accumulates at the end of the transport pipe 12 on the tank side. There is a tendency to end up.

  FIG. 4 is a schematic view showing a state during powder accumulation. As shown in FIG. 4, when powder accumulates, the spring auger 14 is hindered from extending, and cannot take the state shown in FIG. The inhibition of expansion and contraction results in a decrease in the amount of wood pellets transported.

  In such a case, the wood pellet transport operation is stopped, the shutter of the inlet 11a between the tank 11 and the transport pipe 12 is closed, and the end cap 12a provided at the tank side end of the transport pipe 12 is removed. It is necessary to perform cleaning work to remove the powder. However, during this time, the combustion operation in the warm air machine 20 cannot be performed.

  Therefore, the wood pellet conveying apparatus 10 according to the present embodiment includes the accumulation box 15 shown in FIG. 1, and an opening 12 b (see FIGS. 5 to 7) is formed in the conveying pipe 12.

  5 is a cross-sectional view of the transfer pipe 12, FIG. 6 is an enlarged schematic view showing the vicinity of the collection box 15 shown in FIG. 1, and FIG. 7 shows the tank 11, the transfer pipe 12, and the collection box 15. It is a schematic sectional drawing.

  As shown in FIGS. 5 and 6, the transport pipe has an opening 12 b on the lower side in the vicinity of the tank side end. The openings 12b are formed in a total of three places with a width of about 3 mm at a position vertically below the transport pipe 12 and a position shifted from that position by 30 ° about the central axis of the transport pipe 12. The opening 12b may be a slit formed continuously along the longitudinal direction of the transport pipe 12, or may be a hole (eg, φ3 mm) formed intermittently along the longitudinal direction.

  Since it is such a structure, while the powder which reached the conveyance pipe 12 from the inlet 11a passes through the opening 12b, about the wooden pellet which is not powdered, it does not pass through the opening 12b but stays in the conveyance pipe 12. It becomes. In particular, the opening 12 b is formed immediately below the charging port 11 a for supplying the wood pellets from the tank 11 to the transport pipe 12. Accordingly, the powder flows toward the opening 12b while the powder flows from the tank 11 to the transport pipe 12, and the powder can be smoothly accumulated in the accumulation box 15.

  Furthermore, the opening 12b is formed larger than the opening length of the charging port 11a, and more specifically, a gap is formed at both ends in the longitudinal direction of the transport pipe 12. Thereby, it is the structure which can accumulate | store powder more smoothly in the accumulation box 15. FIG.

  As shown in FIG. 6, the collection box 15 is a box-shaped member that covers the opening 12 b from the outside of the transport pipe 12. The side walls of the accumulation box 15 (the side walls at both ends in the longitudinal direction of the transport pipe 12) are located apart from the end of the opening 12b and spaced outward and are larger than the opening 12b in the longitudinal direction of the transport pipe 12. ing.

  Further, as shown in FIG. 7, the stacking box 15 is wider than the transport tube 12 in a cross section orthogonal to the longitudinal direction of the transport tube 12. In addition, the collection box 15 has a structure in which a connection portion with the transport pipe 12 prevents rainwater from entering by welding.

  In addition, as shown in FIG. 6, the collection box 15 is formed with a rectangular opening serving as a cleaning port 15 a on one of its side walls. In addition, the collection box 15 includes a quadrangular lid member 15b for closing the cleaning port 15a. The lid member 15b has a structure that is waterproofed with a packing when the cleaning port 15a is closed, and has a structure in which the vicinity of a rectangular apex is fixed with four butterfly bolts 14c so that the lid member 15b can be opened and closed without a tool. It has become.

  Furthermore, as shown in FIG.6 and FIG.7, the wood pellet conveying apparatus 10 is further provided with the level sensor 16 which detects that the powder amount inside the accumulation box 15 became predetermined amount. The level sensor 16 is configured by, for example, an optical sensor or a capacitance sensor, and transmits a signal to that effect to, for example, the control unit of the warm air fan 20 when the amount of powder in the stacking box 15 becomes full. Thereby, the warm air fan 20 can issue an alarm to the effect that the amount of powder is full, and prompts the operator to clean and prevent forgetting to clean.

  In the above, the opening 12b may be provided not at the vicinity of the tank side end but at the tank side end. In this case, the accumulation box 15 is also provided at the end on the tank side and covers the opening 12 b from the outside of the transport pipe 12.

  Further, in the above, it is assumed that the opening 12b is blocked by a lump of wood pellets or powder. However, the movement of the spring auger 14 prevents the opening 12b from being blocked as described above. .

  Further, in the above description, the vicinity of the tank side end portion is a concept that excludes the warm air fan 20 side from a position directly below the inlet 11a, and the entire opening 12b is located closer to the warm air fan 20 than a position directly below the inlet 11a. If it is, it does not correspond to the vicinity of the tank side end.

  Next, operation | movement of the wood pellet conveying apparatus 10 which concerns on this embodiment, etc. are demonstrated. First, when the warm air fan 20 is operated, the motor 13 of the wood pellet conveying device 10 is driven to rotate in response to an instruction from the control unit of the warm air fan 20.

  As a result, the spring auger 14 rotates and the wood pellets are conveyed to the burner 21 of the hot air machine 20. Further, since the spring auger 14 also performs an expansion / contraction operation, the wood pellets are conveyed to the burner 21 of the warm air machine 20 by this operation.

  When the wood pellets are transported to the hot air machine 20, the wood pellets in the tank 11 are newly supplied to the transport pipe 12 through the inlet 11a. At this time, the powder in the tank 11 is also supplied to the transport pipe 12 through the inlet 11a.

  The powder supplied to the transport pipe 12 reaches the accumulation box 15 through the opening 12b located immediately below the input port 11a. In addition, the powder falling near the opening 12b also falls into the collection box 15 from the opening 12b through the rotation and expansion / contraction operation of the spring auger 14.

  The powder is accumulated in the accumulation box 15. When the amount of powder in the accumulation box 15 becomes full, for example, the level sensor 16 transmits a signal to that effect to the control unit of the hot air fan 20, and the hot air fan 20 indicates that the amount of powder is full. Perform an alarm. Thereby, the operator removes the four butterfly bolts 15c, removes the lid member 15b, and removes the powder in the collection box 15 from the cleaning port 15a.

  Thus, according to the wood pellet conveying apparatus 10 according to the present embodiment, the opening 12b is formed on the tank side end of the conveying pipe 12 or the lower side in the vicinity thereof, so that the tank 11 side of the conveying pipe 12 is on the tank 11 side. The powder is discharged out of the transport pipe 12 through the opening 12b. Therefore, it is possible to prevent a decrease in the transport amount of the wood pellets due to a decrease in the extension amount of the spring auger 14 without hindering expansion and contraction of the spring auger 14.

  Moreover, since the box-shaped accumulation box 15 which covers the said opening 12b from the outer side of the conveyance pipe 12 is provided, the powder discharged | emitted out of the conveyance pipe 12 will accumulate in the accumulation box 15. FIG. For this reason, the operator only needs to clean the powder in the collection box 15, and it is not necessary to stop the transport of the wood pellets and the combustion operation in order to clean the transport pipe 12, and the combustion operation is stopped when cleaning the powder. This can prevent the situation.

  Therefore, it is possible to provide a wood pellet transport apparatus 10 that can prevent a decrease in the transport amount of wood pellets due to a decrease in the amount of elongation of the spring auger 14 and prevent a situation in which the combustion operation stops during powder cleaning. it can.

  Moreover, since the opening 12b is formed immediately below the charging port 11a for supplying the wood pellets from the tank 11 to the transport pipe 12, the powder is opened while the flow of the powder from the tank 11 falls to the transport pipe 12. As a result, the powder can be smoothly accumulated in the accumulation box 15.

  Moreover, since the cleaning port 15a for taking out the powder | flour inside a box is formed, it can be easily cleaned from the cleaning port 15a, without attaching / detaching the accumulation | aggregation box 15 with respect to the conveyance pipe 12, and it is set as an attachment or detachment structure. Since there is no need, the accumulation box 15 can be fixed to the transport pipe 12 by welding or the like, and rainwater can be prevented from entering.

  In addition, since the level sensor 16 that detects that the amount of powder in the accumulation box 15 has reached a predetermined amount is further provided, an alarm can be given when the amount of powder in the accumulation box 15 exceeds a predetermined amount. The person can be encouraged to clean and can be prevented from forgetting to clean.

  As described above, the present invention has been described based on the embodiment, but the present invention is not limited to the above embodiment, and may be modified without departing from the gist of the present invention. For example, in the wood pellet conveying apparatus 10 according to the present embodiment, various dimensions and positions are not limited to those illustrated.

  Furthermore, in the said embodiment, although the example which conveys a wood pellet to the burner 21 of the warm air machine 20 was demonstrated, it is not limited to a warm air machine, but it is made to convey a wood pellet to the absorption-type cold / hot water machine which burns a wood pellet. Alternatively, the wood pellets may be transported to other equipment.

DESCRIPTION OF SYMBOLS 1 ... Warm air system 10 ... Wood pellet conveying apparatus 11 ... Tank 11a ... Loading port 12 ... Conveying pipe 12a ... End cap 12b ... Opening 13 ... Motor 14 ... Spring auger 15 ... Accumulation box 15a ... Cleaning port 15b ... Lid member 15c ... Butterfly bolt 16 ... level sensor 20 ... warm air machine 21 ... burner

Claims (4)

A wood pellet transport device for transporting wood pellets stored in a tank to a burner by rotation and expansion / contraction of a spring auger provided in a transport pipe,
An opening is formed in the tank side edge part of the said conveyance pipe, or the lower side in the vicinity, and the box-shaped accumulation box which covers the said opening from the outer side of the said conveyance pipe is provided. The wood pellet conveyance apparatus characterized by the above-mentioned. 2. The wood pellet transport apparatus according to claim 1, wherein the opening is formed immediately below a charging port for supplying wood pellets from the tank to the transport pipe. The wood pellet according to any one of claims 1 and 2, wherein the accumulation box is provided with a lid for closing the cleaning port while a cleaning port for taking out the powder inside the box is formed. Conveying device. The wood pellet conveying apparatus according to any one of claims 1 to 3, further comprising a level sensor that detects that the amount of powder inside the accumulation box has reached a predetermined amount.

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