JP6859565B2 - Tip transfer device - Google Patents

Description

The present invention relates to, for example, a chip transfer device that conveys chips produced by cutting a log with a chipper, and particularly relates to a device that is devised so that chips can be conveyed efficiently.

Conventionally, chip manufacturing and chip transfer have been performed as follows.
First, there is a chipper as shown in Patent Document 1. This chipper includes a supply conveyor and a disc cutter, and the wood supplied by the supply conveyor is cut by the disc cutter to produce chips.
The chip is conveyed to another location, for example, a sieving apparatus by a spiral conveyor as shown in Patent Document 2. This spiral conveyor has a gutter-shaped conveyor body, and cut chips are dropped and accommodated in the conveyor body. One end of the conveyor body is an open end. A spiral body is arranged in the conveyor body, and the spiral body is rotated by a motor. By rotating the spiral body, the chips dropped and housed in the conveyor body are conveyed to the open end side.

Further, a chip transfer device is configured by combining a plurality of the spiral conveyors, and the dropped / accommodated chips are conveyed to a desired place.

Japanese Unexamined Patent Publication No. 5-84710 Japanese Unexamined Patent Publication No. 11-314729

According to the above-mentioned conventional configuration, there are the following problems.
First, the amount of wood chips discharged from the chipper increases as the amount of wood put into the chipper increases and decreases as the amount of wood put into the chipper decreases. Since the size of the wood put into the chipper varies, naturally, the amount of chips discharged from the chipper also varies. On the other hand, the rotation speed of the spiral body, that is, the transport speed of the wood chips is set to be constant.

Therefore, when a large amount of chips are discharged from the chipper, there is a problem that the chips cannot be completely transported by the chip transfer device and clogging occurs.
On the other hand, even when the amount of chips discharged from the chipper is small, the transport speed is set to be constant, so there is a problem that electric power is wasted.

The present invention has been made based on such a point, and an object of the present invention is to provide a chip transfer device capable of efficiently transporting chips.

In order to achieve the above object, the chip transfer device according to claim 1 of the present application includes a horizontal spiral conveyor that receives and conveys chips discharged from a chipper, and a horizontal spiral conveyor that is erected on the outlet side of the horizontal spiral conveyor and discharges from the horizontal spiral conveyor. comprising a vertical spiral conveyor, and control means for acceleration controlling the rotational speed of the horizontal spiral conveyor and the vertical spiral conveyor in accordance with the amount of chips to be discharged from the chipper, the transport to upward accept chips The control means is characterized in that it controls the number of rotations of the horizontal spiral conveyor and the vertical spiral conveyor based on the chipper current of the chipper.
Further, the chip transfer device according to claim 2 receives and conveys a horizontal spiral conveyor that receives and conveys chips discharged from a chipper, and a horizontal spiral conveyor that is erected on the outlet side of the horizontal spiral conveyor and receives and discharges chips discharged from the horizontal spiral conveyor. A vertical spiral conveyor that conveys upwards, and a control means that controls the number of rotations of the horizontal spiral conveyor and the vertical spiral conveyor according to the amount of chips discharged from the chipper are provided, and the control means is described above. It is characterized in that the rotation speeds of the horizontal spiral conveyor and the vertical spiral conveyor are adjusted and controlled based on the chipper current of the chipper and the signal from the level sensor installed on the discharge side of the chipper.
Further, the chip transfer device according to claim 3 is the chip transfer device according to claim 2, wherein the control means reduces the number of rotations of the horizontal spiral conveyor and the vertical spiral conveyor based on the chipper current of the chipper at low speed / medium speed. It is characterized in that the rotation speeds of the horizontal spiral conveyor and the vertical spiral conveyor are switched between medium speed and high speed based on a signal from a level sensor installed on the discharge side of the chipper.

As described above, according to the chip transfer device according to claim 1 of the present application, the horizontal spiral conveyor that receives and conveys the chips discharged from the chipper and the horizontal spiral conveyor that is erected on the outlet side of the horizontal spiral conveyor and conveys the chips. It is provided with a vertical spiral conveyor that receives the discharged chips and conveys them upward, and a control means that controls the number of rotations of the horizontal spiral conveyor and the vertical spiral conveyor according to the amount of chips discharged from the chipper. Therefore, the chips can be conveyed efficiently.
Further, according to the chip transfer device according to claim 2, in the chip transfer device according to claim 1, the control means controls the number of rotations of the horizontal spiral conveyor and the vertical spiral conveyor based on the chipper current of the chipper. Since it is a thing, the chip can be efficiently conveyed by a simple configuration.
Further, according to the chip transfer device according to claim 3, in the chip transfer device according to claim 1, the control means is perpendicular to the horizontal spiral conveyor based on a signal from a level sensor installed on the discharge side of the chipper. Since the number of rotations of the spiral conveyor is controlled, the chips can be efficiently conveyed by a simple configuration.
Further, according to the chip transfer device according to the fourth aspect, in the chip transfer device according to the first aspect, the control means is based on the chipper current of the chipper and the signal from the level sensor installed on the discharge side of the chipper. Since the rotation speeds of the horizontal spiral conveyor and the vertical spiral conveyor are controlled to be adjusted, the chips can be conveyed more efficiently.
Further, according to the chip transfer device according to claim 5, in the chip transfer device according to claim 4, the control means reduces the rotation speed of the horizontal spiral conveyor and the vertical spiral conveyor at low speed / medium based on the chipper current of the chipper. In addition to switching to high speed, the number of rotations of the horizontal spiral conveyor and the vertical spiral conveyor is switched between medium speed and high speed based on the signal from the level sensor installed on the discharge side of the chipper, so the simple configuration makes it even more efficient. Can transport chips.

It is a figure which shows one Embodiment of this invention, and is the side view which shows the structure of the chip manufacturing plant which incorporated the chip transfer apparatus. It is a figure which shows one Embodiment of this invention, and is the top view which shows the structure of the chip manufacturing plant which incorporated the chip transfer apparatus. It is a figure which shows one Embodiment of this invention, and is the front view which shows the structure of the chip manufacturing plant which incorporated the chip transfer apparatus. It is a figure which shows one Embodiment of this invention, is the perspective view which looked at the chip transfer apparatus from the back side. It is a figure which shows one Embodiment of this invention, and is the rear view of the chip transfer apparatus. It is a figure which shows one Embodiment of this invention, and is the top view of the chip transfer apparatus. It is a figure which shows one Embodiment of this invention, and is the side view of the chip transfer apparatus. It is a figure which shows one Embodiment of this invention, and is VIII-VIII sectional view of FIG. It is a figure which shows one Embodiment of this invention, and is the graph which shows the relationship between the log diameter and the chipper current maximum value. It is a figure which shows one Embodiment of this invention, and is a table which shows the chipper current threshold value, the horizontal inverter frequency, and the vertical inverter frequency corresponding to the set value of the transport speed.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 10. FIG. 1 is a side view showing the configuration of a chip manufacturing plant 1, FIG. 2 is a plan view of the same as above, and FIG. 3 is a front view of the same. The chip manufacturing plant 1 is composed of a chipper 3 and a chip transfer device 5. Has been done.

As shown in FIG. 1, the chipper 3 has a leg portion 13 fixed on the installation surface 9, and the chipper main body 15 is installed on the leg portion 13. A disc cutter 17 is rotatably installed in the chipper main body 15.

A drive unit case 19 is installed on the upper side of the chipper main body 15 in FIG. As shown in FIG. 2, a chipper side pulley 21 is installed on the left side in FIG. 2 in the drive unit case 19. The chipper-side pulley 21 is fixed to the rotating shaft 23 of the disc cutter 17 extending into the drive unit case 19.
Further, a chipper motor 25 is installed on the leg portion 13. The output shaft 27 of the chipper motor 25 extends into the drive unit case 19. A motor-side pulley 29 is installed on the right side of FIG. 2 in the drive unit case 19, and the motor-side pulley 29 is fixed to the output shaft 27 of the chipper motor 25. A V-belt 31 is wound around the chipper-side pulley 21 and the motor-side pulley 29. With such a configuration, the disc cutter 17 is rotated and driven by the chipper motor 25.

Further, as shown in FIG. 1, a log supply conveyor 33 is installed on the right side of FIG. 1 of the chipper main body 15. The log supply conveyor 33 has legs 35, 35 installed on the installation surface 9. A conveyor frame 37 is installed on the upper side of the legs 35, 35 in FIG. 1. A first conveyor roller 39 is rotatably installed on the right side of the conveyor frame 37 in FIG. Further, a conveyor sprocket 41 is rotatably installed on the lower left side of FIG. 1 of the conveyor frame 37. A second conveyor roller 42 is rotatably installed on the upper left side of FIG. 1 of the conveyor sprocket 41. Further, a third conveyor roller 43 is rotatably installed on the left side of FIG. 1 of the second conveyor roller 42. Further, as shown in FIGS. 1 and 2, the first conveyor roller 39, the conveyor sprocket 41, the second conveyor roller 42, and the third conveyor roller 43 have chains 45, 45, and 45. It is being wound. The first conveyor roller 39, the second conveyor roller 42, and the third conveyor roller 43 have an annular protrusion (not shown) in which the chains 45, 45, and 45 are engaged in the axial direction. An annular tooth portion (not shown) with which the chains 45, 45, and 45 are engaged is axially formed on the conveyor sprocket 41 at three locations (in the left-right direction in FIG. 2) at equal intervals. It is formed at three locations (2 in the left-right direction) at equal intervals.

Further, as shown in FIG. 1, a conveyor motor 47 is installed on the conveyor frame 37. A sprocket (not shown) is fixed to the output shaft of the conveyor motor 47, and the conveyor sprocket 41 is formed with an annular tooth portion (not shown) different from the annular tooth portion described above. A chain (not shown) is wound around another annular tooth portion (not shown) of the non-sprocket and the conveyor sprocket 41. As a result, the conveyor sprocket 41 is rotated and driven by the conveyor motor 47, and the chains 45, 45, and 45 are rotated counterclockwise in FIG.

Further, on the upper side of the chain 45 in FIG. 1, there is a guide 48 having both left and right ends and a lower side opened in FIG. 1, and the left side of the guide 48 in FIG. 1 is connected to the chipper main body 15. The log supply conveyor 33 allows the log to pass through the guide 48 and be thrown into the chipper body 15.
Further, the chipper main body 15 is extended to the lower left side in FIG. 1 to form a tip ejection portion 49, and a tip ejection port 51 is provided at the tip thereof. A level sensor 52 is installed in the chip discharge port 51. The level sensor 52 includes a blade (not shown) rotated by a motor (not shown) and a sensor for detecting the rotation of the blade, and the chip (not shown) discharged from the chip discharge port 51 reaches the height of the chip discharge port 51. A signal is output when the chips are deposited and the rotation of the blades (not shown) is hindered by the deposited chips (not shown). By using the signal of the level sensor 52, it is detected that the ejected chip (not shown) has reached the height of the chip ejection port 51.

As shown in FIGS. 1 and 3, the chip transfer device 5 is installed on the chip transfer device installation surface 54 provided at a position lower than the installation surface 9. As shown in FIGS. 4 to 7, the chip transfer device 5 includes, for example, a horizontal spiral conveyor 53, a vertical spiral conveyor 55, and a control means 57 (shown in FIGS. 1 to 3).
The horizontal spiral conveyor 53 includes, for example, an outer cylinder 59 for a horizontal spiral conveyor, as shown in FIGS. 4 to 6. As shown in FIG. 4, the horizontal spiral conveyor outer cylinder 59 has an opening on the upper surface side (upper left side in FIG. 4) and is provided with a chip insertion port 61. The tip insertion port 61 is connected to the tip discharge port 51 of the chipper 3.

Further, for example, as shown in FIG. 6, a horizontal screw 63 is rotatably installed in the outer cylinder 59 for the horizontal spiral conveyor. The horizontal screw 63 is supported only on the right end side in FIG. A horizontal spiral conveyor motor 65 is installed on the right side of FIG. 6 of the horizontal spiral conveyor outer cylinder 59, and the horizontal screw 63 is rotated and driven by the horizontal spiral conveyor motor 65.

Further, as shown in FIG. 8, a resin wear liner 66 is installed on the bottom side (lower side in the middle of FIG. 8) of the inner peripheral surface of the outer cylinder 59 for the horizontal spiral conveyor.

Further, the vertical spiral conveyor 55 includes, for example, an outer cylinder 67 for a vertical spiral conveyor, as shown in FIGS. 4 to 6. As shown in FIG. 4, for example, the outer cylinder 67 for a vertical spiral conveyor is provided with a tip discharging portion 69 on the upper end side in FIG. As shown in FIG. 7, the lower right side of the tip discharging portion 69 in FIG. 7 is opened to serve as the tip discharging port 71. The chip discharge port 71 is opened, for example, on the side of a sieving device (not shown) installed on the upper side of the chip manufacturing plant 1.

Further, a vertical screw (not shown) is rotatably installed in the outer cylinder 67 for the vertical spiral conveyor. The vertical screw (not shown) is supported only on the lower end side in FIG. Further, as shown in FIG. 5, a vertical spiral conveyor motor 73 is installed on the lower side of the outer cylinder 67 for the vertical spiral conveyor in FIG. 5, and the vertical screw (not shown) is provided by the vertical spiral conveyor motor 73. Is rotated and driven.
A resin wear liner (not shown) is also installed on the inner peripheral surface of the outer cylinder 67 for the vertical spiral conveyor.

Further, as shown in FIG. 5, the right end side of the horizontal spiral conveyor outer cylinder 59 in FIG. 5 and the lower end side of the vertical spiral conveyor outer cylinder 67 in FIG. 5 are connected to each other. The cylinder 59 and the inside of the outer cylinder 67 for the vertical spiral conveyor are communicated with each other.
Further, as shown in FIG. 3, the vertical spiral conveyor 55 is vertically installed by the legs 75 (directed in the vertical direction in FIG. 3), but the horizontal spiral conveyor 53 has legs 77a and 77b. It is installed in a state of being inclined with respect to the horizontal (left-right direction in FIG. 3) by 77c, and is inclined upward toward the vertical spiral conveyor 55 side (left side in FIG. 3).

Further, the control means 57 can acquire a current value (hereinafter, referred to as a chipper current) of the chipper motor 25 via a current sensor (not shown). The maximum value of the chipper current (hereinafter referred to as the maximum chipper current value) measured until one log with a predetermined diameter is processed into a chip is measured, and the relationship between this maximum chipper current value and the diameter of the log. Is obtained, and the result shown in FIG. 9 is obtained.
Note that FIG. 9 is a graph showing the relationship between the two, with the diameter of the log on the horizontal axis and the maximum value of the chipper current on the vertical axis.
As is clear from FIG. 9, when the diameter of the raw wood becomes large, a large load is applied to the chipper motor 25, and the maximum value of the chipper current becomes large. On the contrary, if the log has a small diameter, the chipper motor 25 is not heavily loaded and the maximum value of the chipper current becomes small.
The larger the diameter of the raw wood, the larger the amount of chips discharged, and the smaller the diameter of the raw wood, the smaller the amount of chips discharged.
In the present embodiment, paying attention to this relationship, the amount of chips discharged from the chipper 3 and accepted by the chip transport means 1 is estimated based on the chipper current, and the chips are estimated based on the estimated amount of chips. Controls the transport device 5.

Further, the control means 57 can detect that a chip (not shown) has been deposited up to the height of the chip discharge port 51 of the chipper 3 via the level sensor 52, and the signal from the level sensor 52 can be detected. Based on this, the chip transfer device 5 is controlled.
Since it is difficult to accurately detect the height at which chips (not shown) are deposited with the chipper current, the level sensor 52 is used to reliably detect that the chips have been deposited up to the height of the chip discharge port 51. Is installed.

Further, the control means 57 includes an inverter circuit for a horizontal spiral conveyor and an inverter circuit for a vertical spiral conveyor (not shown). The control means 57 controls the rotation speed of the horizontal spiral conveyor motor 65 by the horizontal spiral conveyor inverter circuit, and controls the rotation speed of the vertical spiral conveyor motor 73 by the vertical spiral conveyor inverter circuit.

Next, the operation of this embodiment will be described.
First, a basic operation in manufacturing and transporting a chip (not shown) by the chip manufacturing plant 1 will be described.
First, a log (not shown) is supplied into the chipper 3 by the log supply conveyor 33. The log supplied into the chipper 3 is cut by the disc cutter 17 of the chipper 3 to form a chip, which is discharged from the chip discharge port 51.

The chips discharged from the chip discharge port 51 are dropped and housed in the horizontal spiral conveyor 53 as they are through the chip insertion port 61.
In the horizontal spiral conveyor 53, the horizontal screw 63 is rotated and driven by the motor 65 for the horizontal spiral conveyor, and the dropped chips are conveyed to the vertical spiral conveyor 55 side.
In the vertical spiral conveyor 55, a vertical screw (not shown) is rotated and driven by the motor 73 for the vertical spiral conveyor, and the chips conveyed by the horizontal spiral conveyor 53 are conveyed to the upper side in FIG. It is discharged from 71. The chips discharged from the chip discharge port 71 are put into a sieving device (not shown).

Next, the control of the rotation speeds of the horizontal spiral conveyor 53 and the vertical spiral conveyor 55 by the control means 57 will be described.
The rotation speeds of the horizontal spiral conveyor 53 and the vertical spiral conveyor 55 can be switched in three stages. The slowest speed is the "low speed mode", the fastest speed is the "high speed mode", and the above "" The case of medium speed between "low speed mode" and "high speed mode" is defined as "normal speed mode". These three modes are switched based on the chipper current and the signal from the level sensor 52.

As shown in FIG. 10, when the signal is not detected from the level sensor 52 and the chipper current is 23 A or less, it is determined that the amount of chips discharged is small, and the frequency of the inverter circuit for the horizontal spiral conveyor ( By setting the horizontal inverter frequency) to 20 Hz and setting the frequency of the vertical spiral conveyor inverter circuit (hereinafter referred to as the vertical inverter frequency) to 20 Hz, the operation is performed in the “low speed mode”. At this time, the rotation speed of the horizontal spiral conveyor 53 is 10.4 rpm, and the rotation speed of the vertical spiral conveyor 55 is 15.2 rpm.
Next, when the signal is not detected from the level sensor 52 and the chipper current becomes larger than 23A, it is determined that the amount of chips discharged is an intermediate amount, and the horizontal inverter frequency is set to 28Hz. Then, by setting the vertical inverter frequency to 43 Hz, the operation is performed in the "normal speed mode". At this time, the rotation speed of the horizontal spiral conveyor 53 is 14.6 rpm, and the rotation speed of the vertical spiral conveyor 55 is 32.7 rpm.
Further, when a signal is detected from the level sensor 52, it is determined that the amount of chips discharged is very large, and the horizontal inverter frequency is set to 32 Hz and the vertical inverter frequency is set to 50 Hz. Operate in "speed mode". At this time, the rotation speed of the horizontal spiral conveyor 53 is 16.6 rpm, and the rotation speed of the vertical spiral conveyor 55 is 38 rpm. Further, at this time, the log supply conveyor 33 is stopped so that no more chips are discharged.
In the case of the "high speed mode", the acceptance of raw wood to the raw wood supply conveyor 33 is stopped as necessary.

As described above, in the present embodiment, as the amount of chips increases, the rotation speeds of the horizontal spiral conveyor 53 and the vertical spiral conveyor 55 are increased to prevent clogging, and if the amount of chips is excessive, the horizontal spiral conveyor 53 is prevented from being clogged. The rotation speeds of the spiral conveyor 53 and the vertical spiral conveyor 55 are increased, and the acceptance of raw wood is stopped so that the chips are not discharged. When the amount of chips is small, the rotation speeds of the horizontal spiral conveyor 53 and the vertical spiral conveyor 55 are reduced to reduce power consumption.

Further, as described above, there is a wear liner 66 in the outer cylinder 59 for the horizontal spiral conveyor of the horizontal spiral conveyor 53, and when the amount of chips is large, a chip is provided between the horizontal screw 63 and the wear liner 66. The horizontal screw 63 and the wear liner 66 are prevented from coming into direct contact with each other, and the amount of wear of the wear liner 66 is small.
However, if the amount of chips is small, the horizontal screw 63 and the wear liner 66 come into contact with each other, causing the wear liner 66 to wear. At this time, if the rotation speed of the horizontal spiral conveyor 53 remains high, the amount of wear of the wear liner 66 increases remarkably, but in the case of this one embodiment, the horizontal amount is increased according to the amount of chips. Since the rotation speed of the spiral conveyor 53 is low, the amount of wear of the wear liner 66 is reduced.
Similarly, in the vertical spiral conveyor 55, the amount of wear of the wear liner (not shown) is reduced.

Next, the effect of this embodiment will be described.
First, the chips can be efficiently conveyed. That is, since the chip transfer device 5 has a control means 57 that controls the rotation speed of the horizontal spiral conveyor 53 and the vertical spiral conveyor 55 according to the amount of chips discharged from the chipper 3, the amount of chips can be adjusted to the amount of chips. This is because by setting an appropriate rotation speed according to the number of chips, it is possible to prevent clogging when the amount of chips is large and to eliminate wasteful power consumption when the amount of chips is small.

Further, the control means 57 controls the number of rotations of the horizontal spiral conveyor 53 and the vertical spiral conveyor 55 based on the chipper current and the signal from the level sensor 52 installed in the chip discharge port 51 of the chipper 3. Since it is a device, the configuration for control is also simple. Further, the control means 57 reduces the rotation speed of the horizontal spiral conveyor 53 and the vertical spiral conveyor 55 based on the chipper current of the chipper 3 at a low speed (low). The horizontal spiral conveyor 53 and the vertical spiral conveyor 55 are switched based on the signal from the level sensor 52 installed at the chip discharge port 51 of the chipper 3 while switching between the speed mode) and the medium speed (normal speed mode). Since the rotation speed is switched between medium speed (normal mode) and high speed (high speed mode), the control accuracy is high.
Further, it is possible to reduce the wear of the wear liner 66 of the horizontal spiral conveyor 53 and the wear liner of the vertical spiral conveyor 55 when the amount of chips is small. This is because when the amount of chips is small, the speed is switched to low speed (low speed mode).

The present invention is not limited to the above-described embodiment.
In the above-described embodiment, the rotation speed is controlled based on the chipper current and the signal from the level sensor, but the rotation speed is not limited to this, and only the signal from the level sensor is controlled by the chipper current alone. It is also conceivable to control the rotation speed. Further, for example, the operation at the medium speed (normal speed mode) is started, and after a predetermined time (for example, the time until the tip ejected from the chipper is conveyed by the chip conveying device) elapses, the low speed (for example) It is also possible to switch to low speed mode).
It is also conceivable to recognize the diameter of the raw wood from the image data obtained by the area sensor or the camera, and thereby control the rotation speed. In addition, various detection means can be considered.
Further, in the case of the above-described embodiment, the operation was performed in three stages of low speed (low speed mode), medium speed (normal speed mode), and high speed (high speed mode), but in two stages or four or more stages. It is also conceivable to switch the rotation speed for operation.
Various cases can be considered for the configuration of the level sensor. For example, an infrared projector and a receiver may be installed, and the chip prevents the receiver from receiving infrared rays from the projector.
In addition, the present invention is not limited to the illustrated configuration, and various modifications can be considered.

The present invention relates to, for example, a chip transporting device for transporting chips produced by cutting a log with a chipper, and particularly for a chip transporting device devised so as to efficiently transport chips, for example, chips used in a sawmill. Suitable for transport equipment.

3 Chipper 5 Chip Conveyor 52 Level Sensor 53 Horizontal Spiral Conveyor 55 Vertical Spiral Conveyor 57 Control Means

Claims (3)

A horizontal spiral conveyor that receives and transports chips discharged from the chipper,
A vertical spiral conveyor that is erected on the outlet side of the horizontal spiral conveyor and receives chips discharged from the horizontal spiral conveyor and conveys them upward.
A control means for controlling the rotation speed of the horizontal spiral conveyor and the vertical spiral conveyor according to the amount of chips discharged from the chipper, and
Equipped with
The chip transfer device is characterized in that the control means controls the rotation speeds of the horizontal spiral conveyor and the vertical spiral conveyor based on the chipper current of the chipper. A horizontal spiral conveyor that receives and transports chips discharged from the chipper,
A vertical spiral conveyor that is erected on the outlet side of the horizontal spiral conveyor and receives chips discharged from the horizontal spiral conveyor and conveys them upward.
A control means for controlling the rotation speed of the horizontal spiral conveyor and the vertical spiral conveyor according to the amount of chips discharged from the chipper, and
Equipped with
The control means is characterized in that the rotation speeds of the horizontal spiral conveyor and the vertical spiral conveyor are adjusted and controlled based on the chipper current of the chipper and the signal from the level sensor installed on the discharge side of the chipper. Chip conveyor. In the chip transfer device according to claim 2,
The control means switches the rotation speed of the horizontal spiral conveyor and the vertical spiral conveyor between low speed and medium speed based on the chipper current of the chipper, and is based on a signal from a level sensor installed on the discharge side of the chipper. A chip transfer device characterized by switching the rotation speed of the horizontal spiral conveyor and the vertical spiral conveyor between medium speed and high speed.

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