JPH10235293A - Rotary drum-type screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary drum-type screen with the size of the opening optionally changeable during the operation. SOLUTION: A movable screen member 43 is provided to a rotary drum and moved to make the size of the opening variable by changing the overlapping degree of the opening 36 with the opening of a fixed screen, and a driving mechanism to move the movable screen member 43 is provided on the drum side and an opening changing mechanism 70 for controlling the overlapping degree by regulating the moving distance of the driving mechanism on the drum side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary drum type sieving apparatus for sieving various kinds of objects to be sieved.
More specifically, the present invention relates to a rotary drum type sieving apparatus capable of arbitrarily changing sieves during operation of the sieving apparatus.

[0002]

2. Description of the Related Art Conventionally, there is a rotary drum type sieving apparatus as an apparatus for sifting agricultural products, foods, gravel, and other sifted objects. The rotary drum type sieving device is a device in which a rotary drum having a sieve on a peripheral surface is inclined and supported in a substantially horizontal state, and the rotary drum is driven to rotate and an object to be sieved is put into the rotary drum. It is. Then, the inputted sifted object moves in the circumferential direction on its inner peripheral surface with the rotation of the rotating drum,
Further, the rotary drum moves in the axial direction due to the inclination of the rotary drum, and at the time of this movement, sieve separation is performed by sieves on the peripheral surface of the rotary drum. Such a rotary drum type sieving apparatus has the advantage that the processing capacity is large and a large amount of sifted objects can be continuously sieved.

[0003] In the sieve device, it is desirable that the sieve of the sieve member can be changed in response to a change in the properties of the member to be sifted or a change in the specification to be separated. As described above, there are various types of sieve mechanisms that can arbitrarily change the sieve, but even if a variable sieve mechanism is provided on the rotating drum as described above, the sieve is operated during the operation. Cannot be changed.

Further, even when the sieve of the sieving mechanism is changed while the rotary drum is stopped, in the rotary drum type sieving apparatus, the separated sifted material is discharged around the rotary drum. Since a hopper and a cover for ensuring safety are provided, the workability is extremely poor.

[0005] In particular, recently, a sophisticated sieving separation technique has been required, for example, in which the middle bone of a tobacco leaf is further separated into a small middle bone and a large middle bone, and a sieving apparatus corresponding to such a demand has been developed. is necessary.

[0006] That is, in each part of the harvested tobacco leaf, the petiole part is generally called the middle bone, and the other leaf parts are called lamina. Conventionally, the above-described inner bone portion and lamina portion have been separated by a device called a thresholder. However, recently, the so-called expansion process for expanding the fibers of tobacco leaves has become widespread, and it is possible to separate the above-described middle bone into a larger middle bone with a thicker petiole and a smaller middle bone with a thinner petiole. It became needed. But,
In the case where the middle bone is sieved and separated into a large middle bone and a small middle bone, there is little difference in the properties such as the shape between the two, and the properties etc. are exactly constant because they are agricultural products. Not. For this reason, while measuring the result of sieve separation,
There is a demand for adjusting the sieve, but no rotary drum type sieve device capable of changing the sieve during operation has been developed.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a rotary sieve device capable of arbitrarily changing a sieve during driving.

[0008]

According to a first aspect of the present invention, there is provided a rotary drum disposed substantially horizontally, a rotary drive mechanism for rotating the rotary drum, and a rotary drum provided on a peripheral surface of the rotary drum. A sieve mechanism capable of sieving the object to be sieved in the rotary drum and separating the separated material outside the rotary drum and changing the size of the sieve. A drive change mechanism for sifting the sieve arbitrarily is provided on the rotary drum side.

Therefore, since the drive changing mechanism of the sieve is provided on the rotary drum side, the sieve can be arbitrarily changed even during operation, that is, during rotation of the rotary drum, and the property of the object to be sieved can be changed. In addition, it is possible to cope with a change in the specification of the sieve separation, and it is possible to perform accurate sieve separation, and it is not necessary to stop the apparatus, thereby being efficient.

Further, in the present invention according to claim 2,
In the sieving mechanism, a plurality of sieving mechanism units are provided in a circumferential direction on the peripheral surface of the rotary drum, and the drive change mechanism of the sieve is such that each of the sieving mechanism units is located above the rotary drum. In this state, the sieves of each of the sieve mechanism units are changed.

Therefore, the size of the sieve is changed in a state where the sieve mechanism unit is located at an upper position and is in an inverted state, and the object to be sieved in the sieve is removed by gravity. Even when the sieve is changed to a smaller size, the object to be sieved will not be caught in the sieve.

Further, in the present invention according to claim 3, the drive changing mechanism of the sieve increases the size of the sieve once when the sieve mechanism unit is positioned above the rotary drum. After removing the sifted object clogged with the lever sieve, the sieve is changed to an arbitrary sieve. Therefore, at the time of the change of the sieve, it is possible to reliably prevent the sieve from being caught by the sieve.

According to the present invention, the sieving mechanism unit has a fixed-side sieving member fixed to the rotating drum side and having a large number of sievings, and a large number of sievings. A movable-side sieve member slidable with respect to the fixed-side sieve member, wherein the sliding of the movable-side sieve member causes the sieve of the movable-side sieve member to overlap with the sieve of the fixed-side sieve member. The size of the sieve of the sieve mechanism unit is changed by changing the state. Therefore, the structure of the sieve mechanism unit is simple, and the operation reliability is high.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. This embodiment is a rotary drum type sieving apparatus for separating the above-mentioned shredded tobacco leaf bone into small and large bones. Alternatively, it has a function of automatically and surely removing the middle and middle bones.

First, a schematic configuration of the rotary drum type sieving apparatus will be described with reference to FIGS. Reference numeral 1 in the figure denotes a base of the apparatus, and a support 2 is provided on the base 1. One end of the support base 2 is pivotally supported in a vertically rotatable manner by a bearing 3, and the other end is supported by an inclination adjusting mechanism 4. Then, by adjusting the tilt adjusting mechanism 4, the support base 2 is turned so that the other end thereof faces downward.
An arbitrary inclination is set within a range of several degrees. In FIG. 1, the support 2 is in a horizontal state.

A rotary drum 6 is supported on the support 2. The rotating drum 6 has a substantially cylindrical shape, and ring-shaped support rails 7 are provided on the outer periphery of both ends.
Are provided respectively. The support table 2 is provided with a pair of left and right support rollers 8 corresponding to the support rails 7, respectively, so that the rotary drum 6 is rotatably supported around a substantially horizontal center axis. ing. In an actual operation state, the support table 2 is inclined as described above, so that the rotating drum 6 is also inclined such that the other end faces downward.

The one support roller 8 is driven to rotate by a rotation drive mechanism 9, whereby the rotary drum 6 is rotated. The rotation drive mechanism 9 includes, for example, a motor 10, and includes a speed reducer 11 and a chain 12.
Is to rotate the support roller 8 described above.

One end of the rotary drum 6 is a charging side end, and a charging port 17 and a hopper 14 are provided at the charging side end, and the sieved object conveyed by a conveying mechanism (not shown). That is, the middle bone in which the small and large middle bones are mixed is put into the rotating drum 6. The central portion of the rotary drum 6 is a sieve separation portion, and a sieve mechanism unit described later is provided. With the rotation of the rotary drum 6, the bone introduced into the rotary drum 6 moves on the inner circumferential surface of the rotary drum 6 in the circumferential direction, and the other end of the rotary drum 6, that is, the discharge side end. It moves in the axial direction toward the part. Then, of the middle bones, the small middle bone portion is separated at the center of the sieving mechanism unit of the rotating drum 6 and discharged through the hopper 16. In addition, the part of the large central bone after the small central bone is separated moves to the discharge side end of the rotary drum 6,
It is discharged via the discharge hopper 15.

Next, the rotary drum 6 and the sieving mechanism unit will be described with reference to FIGS. As shown in FIG. 4, the rotating drum 6 is composed of a plurality of longitudinal members 21 and members (not shown) for connecting the members. In this embodiment, these longitudinal members 2
1 are arranged parallel to each other such that six are located at the vertices of the hexagon, so that the rotating drum is substantially hexagonal in cross section.

The above-mentioned support rails 7 are provided on the outer periphery of both ends of the rotating drum 6, and covers 22 and 23 each having a substantially cylindrical shape are provided at both ends. Further, an end plate 2 is provided at the discharge side end of the rotary drum 6.
5 is provided, and a gap that is continuous in the circumferential direction is formed between the end plate 25 and the cover 23, and the gap is formed as the discharge port 24.

A plurality of sieving mechanism units 30 are provided at the center of the rotary drum 6.
These sieve mechanism units 30 are of a substantially flat plate shape, and are provided between the longitudinal members 21 as shown in FIGS. 4 and 5, and are arranged in six rows in the circumferential direction and in two rows in the axial direction. Thus, a total of 12 items are provided. At both ends of the rotating drum 6, a plate is stretched between the longitudinal members 21 and the inner surface thereof is formed in a hexagonal cylindrical shape, and is formed in a passage in which the inserted bone moves. .

Next, each of the above-mentioned sieve mechanism units 30
Will be described. FIG. 6 shows a plan view of one sieve mechanism unit. The sieving mechanism unit 30 includes a rectangular frame member 31 made of, for example, an angle member or the like, and the frame member 31 is attached to the longitudinal member 21 via a mounting bracket 32.

On the entire surface of the frame member 31, a stationary sieve member 42 is provided inside the rotary drum 6. The fixed-side sieve member 42 is formed by arranging a large number of angled members 33 made of an angle material or the like in parallel with each other in the axial direction of the rotating member 6. Therefore, these angled members 31, that is, the fixed-side sieving members 42
And is fixed integrally. And these chevron members 3
7, a gap having a predetermined width is formed between the top of the rotating drum 6 and the adjacent chevron members on both sides of the bottom thereof, as shown in FIG. The sieve 35 of the member 42 is configured.

A movable sieve member 43 is slidably provided along the outer surface of the fixed sieve member 42. The movable side member 43 is composed of a flat plate member 34, and a large number of slits having a predetermined width are formed in these plate members 34 in parallel with the axial direction of the rotary drum 6. 43 is a sieve 36.

A support member 40 such as an angle member is provided at both edges of the outer side surface of the movable sieve member 43. The frame member 31 is provided with a pair of guide mechanisms 37. The guide mechanism 37 includes a guide bar 38 provided along the circumferential direction of the rotary drum 6.
And a sliding bush 39 slidable along the guide bar 38. These sliding bushes 39 are attached to both ends of the support member 40, respectively.

Therefore, the movable side sieve member 43
Are guided by the guide mechanism 37 and are slidably contacted with the outer side surface of the fixed-side sieving member 42 and are movably supported in the circumferential direction of the rotary drum 6. When the movable sieve member 43 slides, the degree of polymerization between the slits or sieves 36 of the movable sieve member 43 and the gaps or sieves 35 between the fixed sieve members 42 as shown in FIG. Are changed, and these polymerized sieves 3
The variable gap formed between 5 and 36 serves as a sieve G of the sieve mechanism unit 30.

The sieving mechanism unit 30 includes:
A sieve member drive mechanism 50 for sliding the movable sieve member 43 is provided. The sieve member driving mechanism 50 includes an air cylinder mechanism 51, and a piston rod 52 having a length adjustable rod end joint 5 is provided.
3 through the support member 40 of the movable-side sieve member 43
It is connected to the. Accordingly, when the rod end 52 of the air cylinder mechanism 51 advances and retreats, the movable sieve member 43 slides and the size of the gap, that is, the size of the sieve G of the sieve mechanism unit 30 changes. When the rod end 52 moves forward, the width of the sieve G increases, and when the rod end 52 retreats, the width of the sieve G decreases.

The sieving mechanism unit 30 includes:
A control mechanism 60 is provided. This control mechanism 60
A control valve 61 provided at an end of the sieve mechanism unit 30 is provided. The control valve 61 switches high-pressure air supplied to the air cylinder mechanism 51, and controls a piston rod 52 of the air cylinder mechanism 51. Move forward or backward. In this embodiment, one control valve 61 is configured to simultaneously control the air cylinder mechanisms 51 of the two sieve mechanism units 30 arranged in the axial direction of the rotary drum 6. Therefore, the control valve 6
1 controlled by the intermediate servo valve 62
The high-pressure air is branched and supplied from the servo valve 62 to the two air cylinder mechanisms 51 of the two sieve mechanism units 30, and these are simultaneously driven and controlled.

A cam mechanism 63 is provided on the member on the support base 2 side supporting the rotary drum 6, ie, on the base side, as shown in FIG. The cam mechanisms 63 are provided on both sides of the rotary drum 6, respectively. When the sieving mechanism unit 30 moves on both sides,
That is, the control valve 61 is driven by the cam mechanism 63 when the sieve mechanism unit rises from below and descends from above.

When the sieving mechanism unit 30 rises from below, the control valve 61 is actuated by the cam mechanism 63, and the piston rod 52 of the air cylinder 51 moves forward to move the sieving mechanism unit 30 down. The width of the sieve G is large, and in the case of this embodiment, it is expanded to the maximum as shown in FIG. 8, and when the sieve mechanism unit 30 is lowered from above, the control valve 61 is controlled by the cam mechanism 63. The sieve mechanism unit 30 is operated in different states, the piston rod 52 of the air cylinder mechanism 51 of the sieve mechanism unit 30 is retracted, the width of the sieve G of the sieve mechanism unit 30 is reduced as shown in FIG. It is configured to be an eye.

The high-pressure air supplied to the air cylinder mechanism 51, the control valve 61, and the like is supplied via a swivel joint provided at the center of rotation of the end of the rotary drum 6. , The high-pressure air piping is omitted.

In the rotary type sieve device, when the sieve G is reduced to a predetermined width, each sieve mechanism unit 30 restricts the width of the sieve G to an arbitrary size. A sieve changing mechanism 70 for setting the sieve width is provided. This sieve changing mechanism 70
Is configured, for example, as shown in FIG.

That is, a stopper member 71 is attached to an end of the plate 34 of the movable sieve member 43. Also, the frame member 3 of the sieve mechanism unit 30
A wedge-shaped stopper 72 is slidably provided on the stopper receiving member 74. An inclined surface 71 a is formed at the tip of the stopper member 71, and the inclined surface 71 a faces the inclined surface 72 a of the wedge-shaped stopper 72. In this embodiment, the sieves G of the two sieve mechanism units 30 arranged in the axial direction of the rotary drum 6 are simultaneously changed, and thus the sieve change of the two sieve mechanism units 30 is performed. The wedge-shaped stopper 72 of the mechanism 70 is connected by a rod 73.

The above-mentioned rod 73 is slidably guided in parallel with the axial direction of the rotary drum 6, and a cam driven member 75 such as a roller is provided at one end thereof. The above-mentioned member on the support base 2 side includes a variable cam mechanism 7 on the side where the sieving mechanism unit 30 descends from above.
The variable cam mechanism 76 includes a cam member 77.
And an adjusting mechanism 7 such as a screw rod for moving the cam member 77.
8 are provided.

Therefore, when the sieving mechanism unit 30 is lowered, the cam follower 75 comes into contact with the cam member 77, and the rod 73 slides to move the wedge-shaped stopper 72.
Moves to a predetermined position. Then, in this state, the piston rod 52 of the air cylinder mechanism 51 retreats,
The movable-side sieve member 43 slides, and the stopper member 7
The first inclined surface 71a is the inclined surface 7 of the wedge-shaped stopper 72.
2a, stops at a predetermined position, and the screen G of the screen mechanism unit 30 is set to a predetermined width.

By adjusting the adjusting mechanism 78 of the variable cam mechanism 76 and changing the position of the cam member 77, the position of the wedge-shaped stopper 72 is changed. The position at which the member 71 stops in contact with the member 71 is also changed. Therefore, the stop position of the movable-side sieve member 43 is changed, and the
The degree of polymerization of the sieve 35 of the fixed-side sieve member 42 with the sieve 35 is changed, and the width of the sieve G of the sieve mechanism unit 30 is changed. In addition, the change of this sieve G
This is also possible during the operation of this sieving device.

Next, the operation of the above device will be described. The bone introduced into the rotary drum 6 is separated by sieving while moving as described above by the rotation of the rotary drum 6.

In this case, as described above, each of the sieving mechanism units 30, when descending from above, has its sieve mesh G
Is set to a predetermined width, and the sieve mechanism unit 3
When 0 passes under the rotary drum 30, it becomes a predetermined sieve G to perform a sieve separation operation of the fine bone.

Next, when the sieving mechanism unit 30 having the sieving separation action as described above rises from below,
As described above, the sieve G of the sieve mechanism unit 30 is used.
Is enlarged, and in the case of this embodiment, the sieve G has the maximum width. When the sieve mechanism units 30 are located above the rotary drum 6, the respective sieve mechanism units 30 are in an inverted state. Therefore, the middle bone clogged in the sieve is reliably dropped and removed by gravity.

Next, when the sieve mechanism unit 30 descends from above, the sieve G is set to a predetermined width as described above, and thereafter, this operation is repeated to prevent clogging without clogging. Make a sieve separation.

Further, by adjusting the sieve changing mechanism 70, the sieve G of each sieve mechanism unit 30 can be adjusted without stopping the operation even during operation of the apparatus. Therefore, the separation state of the middle bone can be measured periodically, and the sieve G can be adjusted according to the result. Therefore, accurate sieving separation can be performed according to the change in the properties of the supplied bone, humidity, and other conditions.

Further, even when various specifications such as the type of the bone or the brand of the cigarette to be manufactured are changed, the sieve can be easily changed as described above. And accurate sieving separation
In addition, since it is not necessary to stop the apparatus, the work can be continuously performed and the efficiency is improved.

Further, in the apparatus of this embodiment, in a state where each sieve mechanism unit is located above it, that is, in an inverted state, the sieves are once expanded to remove a clogged central bone, and then a predetermined number is set. Since the sieve width is set, even when the width of the sieve is changed to be reduced, the middle bone is not bitten by the sieve.

In the above-described embodiment, the fixed-side sieve member is formed by arranging angle-shaped members 33 having a mountain-shaped cross section in parallel.
It has a tapered shape that expands inward. Therefore, clogging is prevented, and the action of eliminating the clogged central bone as described above is further ensured. In addition, since the prevention and elimination of clogging are ensured, the height, that is, the thickness of the angled member 33 can be increased, and sufficient rigidity and strength can be obtained.

The sieve mechanism unit 30 has a simple structure in which only the movable sieve member 43 slides, and it is only necessary to arrange several sieves having the same structure in the circumferential direction. Therefore, the structure is simple, the manufacturing cost can be reduced, and the operation reliability is high.

Further, since the air cylinder mechanism 51 is used as a drive mechanism for driving the movable sieve member 43, there is no oil leakage, no scattering of lubricating oil, etc., and no contamination of the bone. The control valve 61 and the cam mechanism 63 are located at the position of the air cylinder mechanism 51, that is, the sieve member 4
The cam mechanism and the control valve are disposed at positions axially distant from the positions of the cam mechanism and the control valve. It does not get mixed in.

The sieving mechanism unit 30 has a planar shape, and the rotary drum 6 has a substantially polygonal cross section. Therefore, the structure of the sieving mechanism unit 30 is simple, and the middle bone put into the polygonal rotary drum is agitated with the rotation, so that the sieving separation operation is more efficient.

The present invention is not limited to the above embodiment. For example, the sieving apparatus of the present invention can be used not only for separating the above-discussed middle bones for sieving of small and medium bones, but also for other agricultural products, food, gravel, and other sieving objects. The present invention is also applicable to a device for separating crushed pharmaceutical tablets, confectionery and the like. Further, the object to be sieved is not limited to solids, and is of course applicable to the separation of slurry, sludge, and the like in which liquid and solid particles are mixed.

The sieve mechanism need not be of the unit type as described above, and the variable mechanism of the sieve may not be of the type in which the movable sieve member slides as described above. Any structure can be adopted.

The cross-sectional shape of the rotary drum is not limited to a hexagon, but may be other polygons. For example, if the number of sieve mechanism units arranged in the circumferential direction is set to four, the cross-section becomes a quadrangle. Also, the cross-sectional shape of these sieving mechanism units may be arc-shaped, and the cross-sectional shape of the rotary drum may be circular.

The mechanism for variably driving and changing the sieve is not necessarily limited to the air cylinder mechanism and the control valve as described above, but may be a mechanism for mechanically driving and controlling using a cam mechanism or the like. Alternatively, a device using hydraulic pressure instead of air pressure, or an electric device driven and controlled by a motor, a solenoid, or the like may be used.

Further, the mechanism for setting the size of the sieve does not necessarily need to use the wedge-shaped stopper as described above, and other variable stopper mechanisms can be employed. When a motor or the like is used for the drive mechanism, a stepping motor or the like is used, and the amount of rotation is controlled to control the amount of movement of the movable-side sieve member. May be changed and set.

[0053]

As described above, according to the present invention, since the drive changing mechanism of the sieve is provided on the rotary drum side, the sieve can be arbitrarily changed even during operation, that is, during rotation of the rotary drum. It is possible to cope with a change in the properties of the object to be sieved, a change in the specification of the sieving separation, etc., thereby enabling accurate sieving separation and eliminating the need to stop the apparatus, which is efficient.

[Brief description of the drawings]

FIG. 1 is an overall side view of a sieving apparatus according to an embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrow 2-2 in FIG. 1;

FIG. 3 is a view taken in the direction of arrows 3-3 in FIG. 1;

FIG. 4 is a side view of a rotating drum.

FIG. 5 is a sectional view taken along lines 5-5 in FIG. 4;

FIG. 6 is a plan view of a sieve mechanism unit.

FIG. 7 is an enlarged sectional view taken along line 7-7 in FIG. 6;

FIG. 8 is a view corresponding to FIG. 7, showing a fully opened state of the sieve;

FIG. 9 is a schematic diagram of a sieve changing mechanism.

[Explanation of symbols]

 Reference Signs List 6 rotating drum 30 sieving mechanism unit 42 fixed-side sieving member 43 movable-side sieving member 50 sieving member driving mechanism 60 control mechanism 70 sieving change mechanism

Claims (4)

[Claims] 1. A rotary drum arranged substantially horizontally, a rotary drive mechanism for driving the rotary drum to rotate, and provided on a peripheral surface of the rotary drum to sieve and separate objects to be sieved in the rotary drum. A sieve mechanism that separates the leverage from the rotary drum and that can change the size of the sieve, and a sieve provided on the rotary drum and that freely changes the size of the sieve of the sieve mechanism A rotary drum type sieving device, comprising: 2. The sieving mechanism according to claim 1, wherein a plurality of sieving mechanism units are provided on a circumferential surface of the rotary drum in a circumferential direction. 2. The rotary drum type sieving apparatus according to claim 1, wherein a sieve of each of the sieving mechanism units is changed in a state where the sieving mechanism unit is positioned above the rotary drum. 3. The drive changing mechanism for a sieve according to claim 1, wherein, in a state where the sieve mechanism unit is positioned above the rotary drum, the sieve is temporarily enlarged to remove a sieved object clogged in the sieve. 3. The rotary drum type sieving apparatus according to claim 2, wherein said sieving is changed to an arbitrary sieving after being removed. 4. The sieving mechanism unit, wherein the sifting mechanism unit is fixed to the rotating drum side and has a plurality of sieving members, and has a multitude of sieving members and is slidable with respect to the fixed sieving member. A movable sieve member. 3. The rotary drum type sieving apparatus according to claim 2, wherein the size of the eyes is changed.