JP2017095211A - Powder supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a powder supply device 1 capable of stably supplying a predetermined quantity of powder P to a storage bag B even after air-blowing a deaeration net 5.SOLUTION: A control part 60 of a powder supply device 1 includes a deaeration control part 62 and a forced feeding control part 63. The deaeration control part 62 controls deaeration of air from a deaeration space S intermittently with a constant timing so as to control a supply amount of powder P supplied per one storage bag body B from an exhaust port 22 of an inner cylinder 2. The forced feeding control part 63 controls forced feeding of air to the deaeration space S and forced feeding stop of air repeatedly so as to get to a forced feeding time T1 and a forced feeding stop time T2 of air longer than the forced feeding time T1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a powder supply device that can suitably supply powder to a containing bag body.

  2. Description of the Related Art Conventionally, a powder supply device that supplies powder to a storage bag body and seals the storage bag body has been used. Such a powder supply device includes an inner cylinder that guides powder from an upper powder supply port to a lower discharge port, an auger that is rotatably disposed in the inner cylinder and conveys the powder to the discharge port, and a deaeration An outer cylinder covering the inner cylinder so as to form a space. A cylindrical deaeration net that communicates the inside of the inner cylinder and the deaeration space is disposed in the vicinity of the discharge port of the inner cylinder.

  When supplying the powder to the storage bag body, the auger is rotated to guide the powder in the inner cylinder to the discharge port, and the powder is supplied from the discharge port to the storage bag body arranged below. After a certain time has elapsed since the start of the powder supply, the powder in the inner cylinder is sucked through the deaeration net, and the discharge of the powder from the outlet of the inner cylinder is stopped. At this timing, the upper part of the containing bag body is sealed (sealed), and the vicinity of the upper part is cut. Thereby, powder can be sealed in one independent storage bag.

  When such intermittent supply of powder and repeated sealing / cutting of the containing bag body after supply are repeated, the deaeration net may be clogged with powder. In view of such points, for example, Patent Document 1 proposes a powder supply device that blows air through a deaeration net by pumping air such as pulsed air into the deaeration space (for example, Patent Document 1). Or see 2).

JP 2000-247445 A Japanese Utility Model Publication No. 05-16601

  However, in the above-described device, when air is blown to the deaeration net, immediately after that, the supply amount (quantity) of the powder supplied from the discharge port to the containing bag body may temporarily increase. there were. The inventors have confirmed this cause. When the powder is supplied by the auger in the inner cylinder, the powder slightly compressed on the inner wall surface of the inner cylinder is formed in the space where the clearance between the auger and the inner cylinder is formed. It was found that it was attached. Then, when air is blown through the deaeration net continuously for a certain period of time, the powder adhering to the inner wall surface of the inner cylinder peels off from the inner wall surface and scatters with the powder supplied by the auger into the inner cylinder and the containing bag was there.

  In particular, when pulsed air is used for pumping air, high pressure air is instantaneously blown to the deaeration net using surge pressure, so clogging of the deaeration network can be immediately resolved. Since this high-pressure air also flows on the inner wall surface of the inner cylinder, the phenomenon described above becomes more prominent.

  The present invention has been made in view of these points, and the object of the present invention is to stably supply a predetermined amount of powder to the containing bag body even after air blowing through the deaeration net. It is to provide a powder supply apparatus.

  In view of such a point, the powder supply apparatus according to the present invention has a supply port for supplying powder in the upper portion, a discharge port for discharging powder in the lower portion, and powder from the supply port to the discharge port. An auger having a spiral blade that is rotatably disposed in the inner cylinder and conveys the powder in the inner cylinder from the supply port to the discharge port, and the inner cylinder An outer cylinder that covers the inner cylinder and a cylindrical detachment that is attached in the vicinity of the discharge port of the inner cylinder and communicates the inside of the inner cylinder and the deaeration space so as to form a deaeration space therebetween. A discharge that sucks the powder in the inner cylinder through the deaeration net and stops the discharge of the powder from the discharge port of the inner cylinder by degassing the air in the deaeration space Air that blows air into the deaeration net by pumping air into the stop and the deaeration space. A control unit that controls at least a blow unit, a deaeration of air by the discharge stop unit, a pressure feed of air by the air blow unit, and a rotation of the auger, and below the discharge port of the inner cylinder A powder supply device for supplying powder from the discharge port to the storage bag body disposed in the control unit, wherein the control unit controls a supply amount of powder supplied from the discharge port per one of the storage bag bodies. As described above, the deaeration control unit that intermittently controls the deaeration of the air by the discharge stop unit, the air pumping time by the air blow unit, and the air pumping stop time longer than the pumping time, As described above, a pressure feeding control unit that repeatedly controls air pressure feeding and air pressure stopping by the air blowing unit is provided.

  According to the present invention, the control unit controls the air blow unit, so that the air can be blown through the deaeration net by repeatedly and intermittently sending the air pressure to the deaeration space. Thereby, clogging of the deaeration net by the powder can be suppressed, and the suction failure of the powder due to the deaeration of the air at the discharge stop part can be prevented.

  Furthermore, since the air pumping stop time is set longer than the air pumping time and the air pumping and the air pumping stop are repeated, excessive intrusion of air into the inner cylinder can be reduced. Thereby, in the space in which the clearance between the auger and the inner cylinder is formed, it is possible to prevent the slightly compressed powder attached to the wall surface of the inner cylinder from peeling off and scattering. As a result, it is easy to control the supply amount of the powder supplied from the discharge port to the containing bag body to a constant amount.

  As a more preferred aspect, the control unit is configured so that the supply amount of the powder supplied from the discharge port to the containing bag body is a constant amount after the air pressure feeding by the air blow unit is completed. Change the rotation speed.

  According to this aspect, even if air enters the inner cylinder and the slightly compressed powder adhering to the wall surface of the inner cylinder is slightly scattered, by adjusting the rotation speed of the auger, A certain amount of powder can be discharged.

  As a more preferred aspect, the pressure feed control unit controls the start timing of air pressure feeding by the air blow unit based on the number of rotations of the auger or the number of times of air deaeration by the discharge stop unit.

  According to the experiments by the inventors, it has been found that clogging of the deaeration net by the powder occurs when the number of rotations of the auger or the number of deaerations of the air reaches a predetermined number. Thereby, according to this aspect, clogging of the deaeration net can be prevented in advance at a more efficient timing by controlling the start timing of the air pumping by the air blowing unit based on the number of times.

  In another preferred embodiment, the powder supply device includes an operation unit that operates the start of air pressure feeding by the air blow unit via the control unit, and the number of rotations of the auger or air removal by the discharge stop unit. And a notification unit for notifying that the number of times of breathing has reached a predetermined number of times.

  This aspect is also based on the knowledge obtained from the above-mentioned experiments by the inventors, and by knowing that the number of times has been reached by the notification unit, knowing beforehand that the deaeration net is clogged with powder. Can do. As a result, the operator can determine the start of air pressure feeding of the air blow unit by the operation of the operation unit.

  According to the present invention, a predetermined amount of powder can be stably supplied to the containing bag body even after air blowing through the deaeration net.

FIG. 1 is a schematic conceptual diagram of a powder supply apparatus. It is a principal part perspective view of the powder supply apparatus shown in FIG. (A) is the figure which showed the state which supplies a powder to a storage bag body with the powder supply apparatus shown in FIG. 1, (b) is the supply of the powder to a storage bag body with the powder supply apparatus shown in FIG. It is the figure which showed the state which stopped. It is the figure which showed the relationship between the rotation frequency of an auger and the frequency | count of deaeration. It is the figure which showed the state which blows air to a deaeration net | network with the powder supply apparatus shown in FIG. It is a figure for demonstrating the pressure control by an air blow part. It is a figure for demonstrating control of the rotation speed of an auger. (A) is the typical conceptual diagram which showed the modification of the powder supply apparatus shown in FIG. 1, (b) is the typical conceptual diagram which showed the other modification of (a).

Below, the powder supply apparatus 1 which concerns on embodiment of this invention is demonstrated.
As shown in FIG. 1, the powder supply device 1 according to the present embodiment is a device that continuously packs the powder P in the containing bag body B. Specifically, the powder supply apparatus 1 supplies a predetermined amount of powder P supplied from the hopper 6 to the containing bag body B disposed below the inner cylinder 2 by the rotation of the auger 3. The device repeatedly repeats the operation of sealing and cutting the containing bag B after being supplied.

  The powder supply apparatus 1 is disposed rotatably inside the inner cylinder 2 for guiding the powder P from the upper powder P supply port 21 to the lower discharge port 22, and conveys the powder P to the discharge port 22. An auger 3 to be operated, and an outer cylinder 4 covering the inner cylinder 2 so as to form a deaeration space S described later.

  A hopper 6 for putting powder P into the supply port 21 is disposed above the supply port 21 of the inner cylinder 2. The auger 3 is connected to the motor 71 and is rotatably arranged in the inner cylinder 2 so as to rotate by the rotation of the motor 71. The auger 3 is formed with a spiral blade 31 along the rotation axis (axial direction), and the auger 3 rotates, whereby the powder P in the inner cylinder 2 is transferred from the supply port 21 to the discharge port 22. Can be transported.

  As shown in FIG. 2, a plurality of through holes 25 are formed in the peripheral wall 24 near the discharge port 22 of the inner cylinder 2, and the cylindrical deaeration net 5 is attached so as to cover the peripheral wall 24. Yes. Thereby, in the vicinity of the discharge port 22 of the inner cylinder 2, the deaeration net 5 can communicate the inside of the inner cylinder 2 and the deaeration space S through the through hole 25.

  On the peripheral surface of the deaeration net 5, a net-like part 51 that is a finer mesh than the particle size of the powder P is formed. By providing such a mesh portion 51, it is possible to prevent the powder P from passing through the mesh portion 51 when the deaeration space S is deaerated.

  Further, a flange 53 is formed at the leading edge of the deaeration net 5, and the flange 53 abuts against the end surface 41 of the outer cylinder 4 with the deaeration net 5 attached to the inner cylinder 2. Thereby, the lower part of the outer cylinder 4 is sealed, and the deaeration space S can be formed between the inner cylinder 2 and the outer cylinder 4. 1, FIG. 3 (a), (b) and FIG. 5, the attachment state of the inner cylinder 2 and the deaeration net | network 5 is simplified and shown.

  The outer cylinder 4 is attached to an upper portion of the outer cylinder 4 so as to be sealed by an end plate 43, and a tubular connecting portion 44 for supplying or degassing air to the deaeration space S is provided in the vicinity of the upper portion. Is formed.

  The connecting portion 44 of the outer cylinder 4 is connected to the suction pump 11 that deaerates the air in the deaeration space S through the electromagnetic valve 12 and is blown to the deaeration space S through the electromagnetic valve 13. It is connected to an air supply source 14 that pumps air. The electromagnetic valves 12 and 13 are electrically connected to the control unit 60, and the valve opening and closing are controlled by a control signal from the control unit 60.

  Here, the air in the deaeration space S can be degassed via the connecting portion 44 by opening the electromagnetic valve 12 while the suction pump 11 is driven and the electromagnetic valve 13 is closed. Thereby, the powder P in the inner cylinder 2 can be sucked through the deaeration net 5, and the discharge of the powder P from the discharge port 22 of the inner cylinder 2 can be stopped. Note that the suction pump 11 and the electromagnetic valve 12 of the present embodiment correspond to the “discharge stop portion” in the present invention.

  Further, by opening the solenoid valve 13 with the solenoid valve 12 closed, the air of the air supply source 14 can be pumped to the deaeration space S via the connection portion 44. Thereby, air can be blown into the deaeration net 5 (see, for example, FIG. 5). Note that the air supply source 14 and the electromagnetic valve 13 of the present embodiment correspond to the “air blow unit” in the present invention.

  Furthermore, the control part 60 is electrically connected to these so that the motor 71 and the cutter 72 can be controlled. The cutter 72 is disposed below the discharge port 22 of the inner cylinder 2, and at a timing when a predetermined amount of the powder P is stored in the storage bag body B, the cutter 72 receives the control signal from the control unit 60. It is an apparatus which seals the accommodation bag body B by hot-pressing an upper part, and cut | disconnects this so that it may become an individual bag body. After the cutting, the sheet material b as the material of the storage bag body B is sent downward along the guide 73, and the storage bag body B continuous with the sheet material b is formed below the discharge port 22 of the inner cylinder 2. The In addition, since the mechanism which shape | molds the accommodation bag body B etc. is a general mechanism, the detailed description is abbreviate | omitted.

  The control unit 60 includes a CPU, a RAM, and the like as hardware. The controller 60 controls the opening and closing of the electromagnetic valves 12 and 13 by outputting a control signal at a predetermined timing calculated by a CPU or the like based on information such as a timer and the rotation speed of the motor 71. The rotation control of the motor 71, the control of the cutter 72, and the like can be performed.

  The control unit 60 includes a rotation control unit 61, a deaeration control unit 62, and a pressure feed control unit 63 as software. The rotation control unit 61 controls the rotation start and stop of the motor 71 based on a signal from an operation panel (not shown). Further, as will be described later, the rotation control unit 61 is configured to discharge the outlet of the inner cylinder 2 after the air blow by the air blow unit is completed (that is, after the electromagnetic valve 13 is closed from the open state and a predetermined time has elapsed). The rotational speed of the motor 71 (auger 3) is changed so that the supply amount of the powder P supplied from 22 to the containing bag body B becomes a constant amount.

  The deaeration control unit 62 controls the deaeration of air by the electromagnetic valve 12 (discharge stop unit) by controlling the opening and closing of the electromagnetic valve 12. Specifically, the deaeration control unit 62 intermittently deaerates the air by the electromagnetic valve 12 (discharge stop unit) at a constant timing in order to sequentially discharge the powder P to the containing bag body B. Thereby, since powder P is not discharged | emitted from the discharge port 22 at the timing of deaeration, the supply amount (quantity) of the powder supplied from the discharge port 22 per one accommodation bag body B can be controlled.

  Specifically, as shown in FIG. 3A, the auger 3 is rotated at a constant rotational speed (rotational speed r1 in FIG. 7) by the control of the rotation control unit 61 and the deaeration control unit 62, and the inner cylinder The powder P in 2 is conveyed to the discharge port 22, and the powder P is supplied to the containing bag body B. When the supply amount of the powder P to the storage bag body B reaches a certain amount (specifically, after a certain time has elapsed), the deaeration control unit 62 controls the opening of the electromagnetic valve 12.

  As a result, as shown in FIG. 3B, the air in the deaeration space S is deaerated, and the powder P in the inner cylinder 2 is removed via the deaeration net 5 and the through holes 25 formed in the inner cylinder 2. The suction of the powder P from the discharge port 22 of the inner cylinder 2 can be stopped. As a result, the supply amount of the powder supplied to the storage bag body B can be controlled to a predetermined amount.

  Here, when the control of the deaeration by the deaeration control unit 62 is repeated, according to the experiment by the inventors, as shown in FIG. 4, when the deaeration is performed up to a predetermined number of times N ( It was found that clogging of the deaeration net 5 due to powder occurred at time t1). When this clogging occurs, the powder P may fall into the storage bag body B even though the discharge of the powder P from the discharge port 22 of the inner cylinder 2 is stopped by the deaeration control unit 62. As a result, not only the amount of powder in the storage bag body B increases, but also the powder P may bite into the portion that seals the storage bag body B, and the storage bag body B may not be sealed.

  Therefore, in the present embodiment, the control unit 60 is provided with a pumping control unit 63. The pressure feed control unit 63 stops the motor 71 when the deaeration frequency reaches the predetermined number N times, and maintains the closed state of the electromagnetic valve 12 and opens the electromagnetic valve 13 as described below. The valve closing control (pressure feeding start timing control) is performed. Thereby, the pumping control unit can pump air to the deaeration space S at a more efficient pumping start timing, and can prevent the mesh part 51 of the deaeration net 5 from being clogged in advance.

  Specifically, as shown in FIG. 6, an air pumping time (opening time of the electromagnetic valve 13) T1, and an air pumping stop time (closing time of the electromagnetic valve 13) T2 longer than the pumping time T1 In this manner, the air pumping to the deaeration space S and the air pumping stop are repeatedly controlled.

  As a result, as shown in FIG. 5, the control unit 60 repeatedly and intermittently pumps air to the deaeration space S, so that the pumped air passes through the mesh part 51 of the deaeration net 5, It is sent from the through hole 25 of the cylinder 2 into the inner cylinder 2. As a result, the mesh part 51 of the deaeration net 5 is repeatedly air blown, so that clogging of the mesh part 51 of the deaeration net 5 due to the powder P is suppressed, and poor suction of the powder P due to air deaeration is prevented. can do.

  Further, the air pumping stop time T2 is set longer than the air pumping time T1, and the air pumping and the air pumping stop are repeated, so that the entry of excessive air into the inner cylinder 2 is reduced. be able to. Thereby, in the space in which the clearance between the auger 3 and the inner cylinder 2 is formed, it is possible to suppress scattering of the slightly compressed powder Pa attached to the wall surface of the inner cylinder 2. As a result, the supply amount of the powder P supplied from the discharge port 22 to the containing bag body B can be controlled to a constant amount.

  In addition, unlike the pulsed air, the pressure-fed air in the present embodiment does not instantaneously blow high-pressure air onto the deaeration net 5 using surge pressure. That is, in this embodiment, the pressure is set or the valve opening speed of the electromagnetic valve 13 is adjusted so that surge pressure does not occur. In addition to this, even if a low surge pressure is generated, air may be blown to the deaeration net 5 by setting the time until the pressure is stabilized thereafter as the pumping time T1. By this, the deaeration net 5 is blown with air pressure to prevent clogging of the net part 51 with an air pressure that can suppress the peeling and scattering of the slightly compressed powder Pa attached to the wall surface of the inner cylinder 2. Can do.

  In the present embodiment, the pressure feed control unit 63 controls the electromagnetic valve 13 (air blow unit) when the number of deaerations reaches a predetermined number N. However, for example, as is clear from FIG. 4, the number of deaerations and the number of rotations of the motor 71 (auger 3) are in a proportional relationship, so the pumping control unit 63 is based on the number of rotations of the auger 3. The solenoid valve 13 (air blow unit) may be controlled (when the number of rotations reaches a predetermined number n).

  Here, as shown in FIG. 7, the rotation speed of the motor 71 (auger 3) is set in advance until the time t1 when the powder is supplied so that the supply amount (discharge amount) of the powder P becomes constant. The rotational speed r1 is constant. Thereafter, the rotation of the auger 3 is stopped while the pressure control unit 63 controls the electromagnetic valve 13 (air blow unit) (time t1 to time t2).

  In the present embodiment, the rotation control unit 61 further maintains a constant supply amount of the powder P supplied from the discharge port 22 to the containing bag body B after completion of the air pressure feeding to the deaeration space S (time t2). The rotation speed of the auger 3 is changed so that the amount becomes equal. Specifically, the auger 3 is rotated at a rotational speed r2 lower than the initial rotational speed r1 from time t2 to time t3, and is changed to the rotational speed r1 after time t3. Here, the rotation speed r2 and the time for maintaining the rotation speed r2 (time from time t2 to time t3) can be obtained experimentally.

  By performing such control, when air is pumped into the deaeration space S, air enters the inner cylinder 2, and the slightly compressed powder Pa adhering to the wall surface of the inner cylinder 2 is scattered. However, immediately after that, since the auger 3 is rotated at the rotation speed r2, it is possible to suppress the amount (supply amount) of the powder P supplied to the containing bag body B from being increased from a desired amount. . After the time t3 when there is no influence of the scattering of the powder Pa, the auger 3 is rotated at the rotational speed r1, so that a desired amount of the powder P can be supplied to the containing bag body B. In this way, a certain amount of powder P can be discharged from the discharge port 22 of the inner cylinder 2 and a stable amount of powder P can be supplied to the containing bag body B.

  In the embodiment described above, the start timing of the pumping control by the pumping control unit 63 is set based on the number of deaerations or the number of rotations of the motor 71 (auger 3). However, for example, as shown in FIGS. 8A and 8B, the operator may start control by the pressure control unit 63 via the operation unit 64.

  In the powder supply apparatus 1 according to the modification shown in FIG. 8A, the operation unit 64 that operates the start of the pumping of the air to the deaeration space S via the control unit 60, and the rotation frequency of the auger 3 is a predetermined number. A notification unit 65A is further provided for notifying that the number has reached n times by blinking a lamp or a buzzer.

  Accordingly, the notification unit 65A notifies that the rotation number of the auger 3 has reached the predetermined number n times, so that the operator can know in advance that the deaeration net 5 is clogged. it can. Then, the operator can determine that air blow is necessary for the deaeration net 5, and can start the pumping of air into the deaeration space S by the pressure control unit 63 by the operation of the operation unit 64.

  As another modification, as shown in FIG. 8B, a notification unit 65B that notifies that the number of times of degassing has reached a predetermined number N may be provided. In this case as well, the operator knows in advance that clogging of the deaeration net 5 has occurred, and can blow the deaeration net 5 by operating the operation unit 64.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various designs can be made without departing from the spirit of the present invention described in the claims. It can be changed.

  In this embodiment, as shown in FIG. 7, immediately after the air blow, the auger is increased (changed) stepwise from the rotational speed r2 to the rotational speed r1. However, as long as a certain amount of powder can be supplied to the containing bag body, the rotational speed of the auger may be increased to the rotational speed r1 in an inclined manner.

1: powder supply device, 2: inner cylinder, 3: auger, 4: outer cylinder, 5: deaeration net, 6: hopper, 11: suction pump (discharge stop part), 12: solenoid valve (discharge stop part), 13: Solenoid valve (air blow part), 14: Air supply source (air blow part), 21: Supply port, 22: Discharge port, 24: Perimeter wall, 25: Through hole, 43: End plate, 44: Connection part, 51: Net part, 53: collar part, 60: control part, 61: rotation control part, 62: deaeration control part, 63: pumping control part, 64: operation part, 65A, 65B: notification part, 71: motor, 72: Cutter, 73: Guide, B: Storage bag body, S: Deaeration space, P: Powder

Claims (4)

A supply port for supplying powder is formed at the top, a discharge port for discharging powder is formed at the bottom, and an inner cylinder that guides the powder from the supply port to the discharge port;
An auger having a spiral blade that is rotatably arranged in the inner cylinder and conveys the powder in the inner cylinder from the supply port to the discharge port;
An outer cylinder covering the inner cylinder so as to form a deaeration space between the inner cylinder and the inner cylinder;
A cylindrical deaeration net attached to the inner cylinder in the vicinity of the outlet, and communicating the inner cylinder and the deaeration space;
By discharging the air in the deaeration space, the powder in the inner cylinder is sucked through the deaeration net, and a discharge stop unit that stops discharging the powder from the discharge port of the inner cylinder;
An air blow unit for blowing air into the deaeration net by pumping air into the deaeration space;
A control unit that controls at least the deaeration of air by the discharge stop unit, the pressure feeding of air by the air blow unit, and the rotation of the auger,
A powder supply device for supplying powder from the discharge port to a storage bag body disposed below the discharge port of the inner cylinder,
The controller is configured to intermittently control the deaeration of the air by the discharge stop unit at a constant timing so as to control the supply amount of the powder supplied from the discharge port per one containing bag body. A pressure control unit that repeatedly controls the air pressure feeding by the air blowing unit and the air pressure feeding stop so that the air pressure feeding time is longer than the pressure feeding time and the air pressure feeding stop time is longer than the pressure feeding time. And a powder supply device.   The controller changes the rotation speed of the auger so that the supply amount of the powder supplied from the discharge port to the containing bag body becomes a constant amount after the air pressure feeding by the air blow unit is completed. The powder supply apparatus according to claim 1.   The said pressure-feeding control part controls the pumping start timing of the air by the said air blow part based on the frequency | count of rotation of the said auger, or the frequency | count of deaeration of the air by the said discharge stop part, The Claim 1 or 2 characterized by the above-mentioned. Powder feeder.   The powder supply device includes an operation unit that operates the start of air pressure feeding by the air blowing unit via the control unit, and the number of rotations of the auger or the number of deaerations of air by the discharge stop unit reaches a predetermined number of times. The powder supply apparatus according to claim 1, further comprising: a notification unit that notifies that the operation has been performed.

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