JPH0645855Y2 - Powder extractor - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder extracting device.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional general powder extracting device Z.
Indicates ₀ . In this conventional powder take-out device Z ₀ , a cutting screw feeder 63 is arranged at a hopper outlet 62 provided at the lower end of the hopper 61, and the naturally accumulated powder in the hopper 61 is cut out as it is. It is cut out by 63 and sent out to the belt conveyor 64 side. The powder sent to the side of the belt conveyor 64 is sent to the bag-filling screw feeder 65 further following by the belt conveyor 64,
The bag-filling screw feeder 65 sequentially packs a required amount of bags.

On the other hand, on the belt conveyor 64, the weight of the powder placed on the belt conveyor 64 (accurately, the total value of the weight of the belt conveyor 64 and the weight of the powder) is continuously measured. Detecting load cells 67, 67 are provided, and the controller 68 uses these load cells 67, 6
The current amount of powder taken out (the weight taken out per hour) is calculated from the detected value of 7 and the rotation speed of the drive motor 66 of the cutting screw feeder 63 is fed back so that this becomes the preset set weight. It is designed to be controlled.

[0004]

However, in such a conventional powder take-out device, the powder in the naturally accumulated state in the hopper 61 is taken out as it is and packed into a bag, so that it is conveyed and packed into a bag. The powder to be contained contains a large amount of air and its density is low (in other words, the specific weight is low), and deaeration operation is required when packing the bag. It is necessary to dispose a degassing mechanism separately from the cutting screw feeder 63, which leads to an increase in size of the apparatus, which is not preferable especially in terms of effective use of factory space.

Further, when the powder is conveyed in a low density state, when the powder is conveyed at the same weight as compared with the case where the powder is conveyed in a high specific weight state after deaeration, the volume is reduced. The larger the size is, the larger the transport capacity is required, which also leads to the enlargement of the apparatus.

Further, since the powder is taken out and conveyed in a low-density state where it is easily scattered, it is possible that the powder scatters to the surroundings at the time of taking out or conveying to deteriorate the surrounding environment.

Further, the amount (weight) of the powder conveyed on the belt conveyor 64 largely depends on the specific weight of the powder, but in the conventional structure, the powder hopper 61 is used.
Since it is taken out from the natural deposition state from
The specific weight itself largely depends on the remaining amount of powder in the hopper 61 (that is, the weight of the residual powder). As a result, as compared with the case where the specific weight of the powder supplied to the belt conveyor 64 is kept substantially constant, for example, the control frequency of the motor 66 by the controller 68 is controlled by the remaining amount of the powder. It is conceivable that the control will increase and the stability of control and eventually the accuracy of measurement will be impaired.

In view of the above, the present invention provides a powder conveying device including a powder extracting device by attaching a degassing mechanism to the extracting mechanism for taking out the powder from the hopper so that degassing can be performed at the same time when the powder is taken out. The purpose of this product is to make the whole compact, to prevent the deterioration of the surrounding environment, to improve the weighing accuracy, and also to provide a powder extraction device that ensures the powder extraction work.

[0009]

In the present invention, as a concrete means for solving such a problem, as shown in FIG. 1A and FIG. 1B, it is provided at the lower end portion of the hopper 1 for storing the powder P ₁ . The outer peripheral wall 32a of the lower end opening 11 is made of a porous material having a property of permitting the passage of air but preventing the passage of the powder P ₁ , and the rotation speed of which is adjustable. Is arranged in such a state that a part of the outer peripheral wall 32a faces the inside of the lower end opening 11 and a powder outlet 12 of a predetermined size is formed between the outer peripheral wall 32a and one side surface 11a of the lower end opening 11. While making it rotatable in the direction from the inner side of the lower end opening 11 toward the powder outlet 12 side, the partition wall 43, is formed in the drum inner chamber 33 formed inside the rotary drum 3. 43 ...
, And the partition member 4 fixedly arranged in a non-rotating state is housed so as to be rotatable relative to the rotating drum 3, and the partition walls 43, 43 ,.
3 are divided in the circumferential direction into a plurality of compartments 50, 50, ... And further, among the compartments 50, 50, ..., A compartment located at a position facing the lower end opening 11 of the hopper 1. 5
., 50, 50 ... Are connected to the degassing means 22, and the compartments 50, 50 ,. There is.

[0010]

In the present invention, the following action can be obtained by adopting such a configuration. That is, the lower end opening 1 of the hopper 1
By rotating the rotating drum 3 arranged facing the No. 1 at a predetermined speed, the powder in the vicinity of the rotating drum 3 is sequentially moved forward by the frictional force with the outer peripheral wall 32a of the rotating drum 3. It is fed out and taken out from the powder carry-out port 12.

In this case, the outer peripheral wall 32a of the rotary drum 3
Is composed of a porous material, and among the compartments 50, 50, ... Formed inside thereof, those located at the position facing the lower end opening 11 are connected to the degassing means 22, The powder in the vicinity of the outer peripheral wall 32a is gradually deaerated so that its density is increased (that is, the specific weight is increased), and at the same time, it seems that the powder is adsorbed to the outer peripheral wall 32a by the suction force during deaeration. It becomes a state.

Therefore, since the powder taken out from the powder carrying-out port 12 is in a relatively solid state, it is less likely to be scattered during the transportation, and the specific weight of the taken-out powder is also the powder in the hopper 1. It is hardly affected by the remaining amount of the body. For example, in the case where the powder taken out from the hopper 1 is weighed and the take-out amount is feedback-controlled, the control frequency is reduced and the weighing accuracy is stable. To do.

Further, the frictional force between the powder and the outer peripheral wall 32a is increased by the suction action at the time of deaeration, and since the powder itself is in a relatively solid state, the rotational force of the outer peripheral wall 32a is increased. Is efficiently transmitted to the surrounding powder, and as a synergistic effect of these, the powder is taken out from the hopper 1 stably and surely.

On the other hand, while the powder is sucked toward the outer peripheral wall 32a of the rotary drum 3 as described above, the powder is gradually fed forward in the rotation direction and finally taken out from the powder carry-out port 12. Along with the rotation of the rotary drum 3, a part of the outer peripheral wall 32a, which has been in the state of carrying the powder until now, moves to the outside of the lower end opening 11 and communicates with the air supply means 21. , 50, ... Corresponding to the outer peripheral wall 32a, the air supplied from the air supply means 21 to the compartments 50, 50 ,. The powder adhered to the outer peripheral wall 32a is smoothly separated from the outer peripheral wall 32a by receiving the dynamic pressure of the blown air. Therefore, almost no powder is again brought into the lower end opening 11 while being attached to the outer peripheral wall 32a, and the powder can be taken out accurately and stably.

Further, since the rotating speed of the rotating drum 3 is adjustable, the amount of powder taken out from the hopper 1 itself can be easily controlled by changing the rotating speed of the rotating drum 3. It is possible.

[0016]

Therefore, according to the powder extracting apparatus of the present invention, the following effects can be obtained. While enabling the powder to be taken out from the hopper by the rotation of the rotary drum arranged at the powder carrying-out portion of the hopper, among the plurality of compartments formed inside the drum inner chamber of the rotary drum, Since the powder in the vicinity of the outer peripheral wall of the rotary drum is degassed by communicating the powder at the position facing the lower end opening with the degassing means, for example, as in the conventional powder It is not necessary to attach a deaeration mechanism separately from the take-out mechanism, and the device can be made more compact, which contributes to effective utilization of factory space.

Since the powder in the hopper can be degassed and taken out in a high-density, relatively solid state,
There is little scattering of the powder at the time of taking out or during the transportation thereafter, and thus it is possible to prevent the deterioration of the surrounding environment and contribute to the improvement of the working environment.

Since the specific weight of the powder taken out from the hopper is forcibly increased by degassing,
Since the specific weight of the powder to be taken out is rarely affected by the remaining amount in the hopper unlike the conventional method of taking out the powder in the state of natural accumulation, for example, after taking it out from the hopper, weighing it In the case of performing feedback control of the withdrawal amount itself based on the measured value, the control frequency is reduced as much as there is no effect on the remaining amount of the hopper, and more stable and highly accurate powder withdrawal control is possible. It is a thing.

Since the powder is drawn out to the front side in the rotation direction while being sucked toward the outer peripheral wall side of the rotating drum, compared with the case where the powder is drawn out only by the frictional force based on the mere contact pressure. As a synergistic effect that more reliable feeding can be performed and that the rotating force of the rotating drum is efficiently transmitted to the surrounding powder due to higher specific weight by degassing, the powder can be taken out in a more stable state. The reliability of the work can be improved.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The powder extracting device of the present invention will be described below in detail with reference to the embodiments shown in the accompanying drawings. FIGS. 1A and 1B are provided with the powder extracting device according to the embodiment of the present invention. A powder taking-out / conveying system is shown. In each of the drawings, reference numeral 1 is a hopper, and a degassing / carrying-out mechanism 2 described later is arranged in a lower end opening 11 formed at a lower end of the hopper 1. Has been done. Further, below the hopper 1, there is arranged a carrying / measuring mechanism 5 to be described later for carrying out continuous weighing of the powder taken out from the hopper 1, and also carrying this carrying / measuring mechanism 5. A screw feeder 9 used for operations such as bag packing of powder is arranged at the downstream end of the.

The degassing / unloading mechanism 2 is the subject matter of the present invention, and includes a rotating drum 3 and a partition member 4 which will be described later.
It has and. The rotary drum 3 has a substantially bottomed cylindrical shape in which a cylindrical wall body member 32 having a predetermined diameter is integrally attached to a side surface of an end surface wall member 31 formed of a disc body having a predetermined size. ing. Then, the body wall member 32 of the rotating drum 3
Is made of a porous material having properties that allow the passage of air and prevent the passage of powder.

The rotary drum 3 constructed as described above is supported while the rotary shaft 13 provided on the outer surface of the end wall member 31 is rotatably supported by the support base 15, and the speed is variable. It is adapted to be rotationally driven by the motor 6. The rotary drum 3 is attached to the lower end opening 11 of the hopper 1, and the relative attachment position with respect to the lower end opening 11 in that case is set as follows.

That is, in the vertical direction, the rotary drum 3 has a substantially upper half portion thereof inserted into the lower end opening 11. Further, in the horizontal direction, the lower end opening 1
1 is offset to one side thereof, and one side of the outer peripheral wall 32a of the body wall member 32 has the lower end opening 11
One side surface 11a is separated from the one side surface 11a by a predetermined dimension to form a powder outlet 12 of a predetermined size between the side surface 11a and the other side surface of the outer peripheral wall 32a. It is made as close as possible to the other side surface 11b. It should be noted that the rotating direction of the rotary drum 3 is such that the portion located in the lower end opening 11 passes through the inside of the lower end opening 11 from the other side surface 11b and one side 11a side (that is, the powder discharge port). 12 side).

On the other hand, a partition member 4 to be described later is arranged in the drum inner chamber 33 formed inside the rotary drum 3. The partition wall member 4 includes an end face wall member 41 having substantially the same size as the end face wall member 31 of the rotary drum 3, a support shaft 42 projecting from an axial center portion of the end face wall member 41, and the support. .. and a plurality of partition walls 43 radially arranged around the shaft 42 at a predetermined interval. And
The partition member 4 is provided in the drum inner chamber 33 of the rotary drum 3.
With respect to the opening end side, it is inserted in a close state and is supported by an appropriate supporting mechanism (not shown) so as to be non-rotatable and movable in the axial direction. Therefore, the drum inner chamber 33 is partitioned into a plurality of compartments 50, 50, ... Lined up in the circumferential direction by the partition walls 43, 43 ,. The outer peripheral wall 32a of the body wall member 32 sequentially moves between the compartments 50, 50 ,.

In the assembled state of the partition wall member 4 to the rotary drum 3, the end face wall member 41 is pressed against the end face of the end face wall member 31 via the sliding member 17 by the urging force of the spring 14. The drum inner chamber 33 is made into a substantially sealed space. The outer peripheral edge of each of the partition walls 43, 43, ...
The inner surfaces of the two are closely facing each other.

Further, the end wall member 41 of the partition member 4 is
Through holes are formed in the portions corresponding to the compartments 50, 50, ..., Of which are formed in the compartments 50, 50 ,. , Respectively, and the air outlets 45, 45, ... Formed in the compartments 50, 50, .. And
.. are communicated with a degassing chamber 46 formed outside the end wall member 41, and the air vents 45, 45 ,. Are communicated with each. Further, the degassing chamber 46 is connected to the vacuum pump 22 (corresponding to degassing means in the scope of utility model registration claims) via the air outlet 48, and the air supply chamber 47 is connected to the blower via the air inlet 49. 21 (corresponding to the air supply means in the scope of utility model registration request)
Are communicated with each.

Therefore, each compartment 5 in the rotary drum 3 is
Out of 0, 50, ..., the compartment 5 facing the lower end opening 11
0,50, ... (Hereafter, for convenience of explanation, the degassing side compartments 50,5
0, ...) are respectively vacuum-sucked by the vacuum pump 22, and, conversely, the compartments 50, 50, ... (Hereinafter, the air supply side compartments 50, 50 ,.
Means that air is pumped by the blower 21. When the rotary drum 3 rotates around the partition wall member 4, the outer peripheral wall 32a of the body wall member 32 moves to the first position.
Degassing-side compartments 50, 50, ...
50, ... And so on. In FIG. 1A, reference numeral 16 is a carry-out amount adjusting member 16 for adjusting the carry-out amount of the powder by increasing or decreasing the passage area of the powder carry-out port 12, and prevents the runaway of the powder from occurring. It works as it does.

On the other hand, the conveying / measuring mechanism 5 includes a belt conveyor 54 comprising conveyor rollers 51, 51, a conveyor belt 52 wound between them, and a conveyor supporting frame 53 for supporting them, and the belt conveyor 54. And a weight measuring device 7 or 7 configured by a load cell or the like for integrally supporting 54 and continuously detecting the total value of the weight of the belt conveyor 54 and the weight of the powder placed on the belt conveyor 54. is doing. Then, the weight value continuously detected by each of the weight measuring devices 7, 7 is sequentially input to the controller 8. Further, in the controller 8, the current carry amount per time is calculated from the input value, and the degassing / unloading mechanism 2 is operated so that the carry amount becomes a preset set value.
The rotation speed of the motor 6 is controlled by feedback.

[0029] Next, the operation such as the removal and transport system of the thus constituted powder, description will be given while focusing on the operation of the deaeration and unloading mechanism 2, the powder P ₁ of a predetermined amount in the hopper 1 First, the carry-out amount adjusting member 1
6 is set to set the effective area of the powder outlet 12 to a predetermined value, and the blower 21 and the vacuum pump 22 are
The operation of each of the degassing side compartments 50, 50, ...
Is depressurized and the air supply side compartments 50, 50, ... Are pressurized. Then, under this condition, the motor 6 is operated to rotate the rotary drum 3 at a predetermined rotational speed.

Then, as the rotary drum 3 rotates, the powder in the vicinity of the outer peripheral wall 32a of the body wall member 32 is sequentially fed forward in the rotational direction due to the frictional force between the rotary drum 3 and the outer peripheral wall 32a. Belt conveyor 5 sequentially from the body outlet 12
In this case, the outer peripheral wall 32a of the rotary drum 3 is made of a porous material, and the powder is exposed to the lower end opening 11 of the outer peripheral wall 32a. Since the parts that directly contribute to the delivery of the body correspond to the deaeration-side compartments 50, 50, ..., The powder in the vicinity of the outer peripheral wall 32a is gradually deaerated and its density is increased. (In other words, the specific weight is increased), and the suction force at the time of degassing causes the state where the outer wall 32a is adsorbed. Therefore, the frictional force between the powder and the outer peripheral wall 32a is further increased by the suction action at the time of deaeration, and since the powder itself is in a relatively solid state, the rotational force of the outer peripheral wall 32a is efficient. The powder is well transmitted to the surrounding powder, and as a synergistic effect of these, the powder is taken out from the hopper 1 stably and reliably.

Further, since the powder taken out from the powder carry-out port 12 is in a relatively solid state, it is scattered during the falling from the powder carry-out port 12 to the belt conveyor 54 side or during the subsequent conveyance. Therefore, it is possible to prevent the deterioration of the surrounding environment due to the scattering of the powder.

On the other hand, the powder is gradually drawn out to the front side in the rotation direction while being sucked to the outer peripheral wall 32a side of the rotary drum 3 as described above, and finally taken out from the powder carry-out port 12 to the belt conveyor 54 side. In this case, in this case, as the rotary drum 3 rotates,
The part that has been in the state of conveying the powder until now (that is, the part corresponding to the degassing side chambers 50, 50, ...) Moves to the outside of the lower end opening 11 and moves to the air sending side chamber 50. , 50, ..., the powder adhered to the outer peripheral wall 32a in a suction state needs to be quickly separated from the outer peripheral wall 32a. In this case, in this embodiment,
.. are pressurized, and air is blown outward from the entire area through the outer peripheral wall 32a on the outer peripheral wall 32a corresponding thereto. The powder adhered to the outer peripheral wall 32a is smoothly separated from the outer peripheral wall 32a under the dynamic pressure of the blown air. Therefore, almost no powder is again brought into the lower end opening 11 while being attached to the outer peripheral wall 32a,
Thus, the powder can be taken out accurately and stably.

In this case, in this embodiment, a plurality of compartments 50, 50, ... Are formed, and deaeration ports 44, 44, ... Or air supply ports 45, 45 ,. Since the degassing action or the air feeding action is not biased to one side in the circumferential direction, the degassing side compartment 5 is formed.
In 0, 50, ..., the deaeration action in each of these chambers is equalized as much as possible, and the air supply side compartments 50, 50 ,.
.., the air blowing action in each of these rooms is made as uniform as possible.

On the other hand, the weight of the powder P ₂ sequentially taken out from the hopper 1 side to the belt conveyor 54 side is continuously measured by the weight measuring devices 7, 7 while being on the belt conveyor 54, The measured values are sequentially input to the controller 8. In the controller 8, the current take-out weight per time is calculated based on the input value, and a control signal is output to the motor 6 so that the calculated value becomes a preset weight set, and the rotation is performed. The rotation speed of the drum 3 is feedback-controlled. As a result, continuous quantitative extraction of powder is realized.

In this case, in this embodiment,
Since the density of the powder P ₁ is forcibly increased by the degassing action when the powder P ₁ is taken out from the hopper 1, the density of the powder is affected by the weight of the remaining powder in the hopper 1. The density rarely fluctuates,
The specific weight of the powder P ₂ dropped and supplied from the hopper 1 to the belt conveyor 54 side is stable. Therefore, when the rotation speed of the rotary drum 3 is feedback-controlled by the controller 8, the control by the fluctuation of the powder density based on the remaining amount of powder in the hopper 1 is hardly necessary, and the amount taken out from the hopper 1 is simply used. It suffices if only the control based on the fluctuation of the control is performed, the frequency of the drooping control is reduced, and stable and highly accurate extraction amount control is possible.

Further, in this embodiment, the degassing / unloading mechanism 2 provided on the hopper 1 side is designed to simultaneously degas the powder at the same time as the powder is taken out. Even if the powder is packed in item 9, there is no need to provide a deaeration step immediately before this bag packing, and the whole device can be made compact, which in turn contributes to effective utilization of factory space. It is possible.

[Brief description of drawings]

FIG. 1A is a cross-sectional view of a powder extraction device according to an embodiment of the present invention.

1B is a vertical cross-sectional view taken along the line I-I of FIG. 1A.

FIG. 2 is a structural explanatory view of a conventional powder extraction device.

[Explanation of symbols]

1 is a hopper, 2 is a degassing / unloading mechanism, 3 is a rotating drum,
4 is a partition member, 5 is a conveying / measuring mechanism, 6 is a motor, 7
Is a weight measuring device, 8 is a controller, 9 is a screw feeder, 11 is a lower end opening, 12 is a powder outlet, 13 is a rotation shaft, 15 is a support base, 16 is a delivery amount adjusting member, 14 is a spring, 15 Is a support base, 16 is a carry-out amount adjusting member,
Reference numeral 17 is a sliding member, 21 is a blower, 22 is a vacuum pump, 31 is an end wall member, 32 is a body wall member, 33 is a drum inner chamber, 41 is an end wall member, 42 is a spindle, 43 is a partition wall,
44 is a degassing port, 45 is a gas feeding port, 46 is a degassing chamber, 47 is a gas feeding chamber, 48 is an air outlet, 49 is an air inlet, 50 is a compartment, 51 is a conveyor roller, 52
Is a conveyor belt, 53 is a conveyor support frame, 54
Is a belt conveyor.

Claims (1)

[Scope of utility model registration request] 1. A hopper allowed to reservoir powder (P ₁₎ (1)
At the lower end opening (11) provided at the lower end of the
2a) is made of a porous material having a property that allows the passage of air but blocks the passage of powder (P ₁ ), and the rotating drum (3) whose rotation speed is adjustable wall
A part of (32a) is exposed in the lower end opening (11) and a powder carrying-out port (12) of a predetermined size is formed between the lower end opening (11) and one side surface (11a). And is formed inside the rotary drum (3) while being rotatable in the direction from the inner side of the lower end opening (11) to the powder outlet (12) side. Inner chamber
The partition wall (4) provided with partition walls (43), (43), ... In (33) and fixedly arranged in a non-rotating state is arranged to be rotatable relative to the rotating drum (3). The above-mentioned partition walls (43), (43), ... Are accommodated to partition the drum inner chamber (33) into a plurality of compartments (50), (50) ,. Of the compartments (50), (50), ..., the compartments (50), (50), ... located at the positions facing the lower end opening (11) of the hopper (1) are not removed. A chamber (5) communicating with the air means (22) and located outside the lower end opening (11).
0), (50), ... are the powder extracting devices characterized by communicating them with the air feeding means (21).