JPH078701A - Drum dryer - Google Patents

Abstract

PURPOSE:To cause no harmful strain and easily alter the size between a rotary body and a drum by sliding a shaft sealing mechanism by interlock with the rotary shaft when the rotary body slides and making the displacement of the rotary shaft absorbed by the deformation of a flexible joint. CONSTITUTION:Rotary shafts 21, 31 of slide drums 20, 30 are set in the outside of a chamber 11 by penetrating rotary shaft insertion holes 12a, 12b of the chamber's wall. The end part of the rotary shaft 21 of the fixed drum 20 is supported by an apparatus main body through a bearing 13a, and a shaft sealing mechanism 14a is fitted on the outside of the rotary shaft 21 and at the same time the system 14a is fixed in the peripheral part of the rotary shaft insertion hole 12a of the chamber's wall. The end part of the rotary shaft 31 of the slide drum 30 is supported by a slide mechanism 40 through a bearing 13b. The displacement of the rotary shaft 31 is absorbed by the deformation of a flexible joint 50 and thus harmful strain is not caused in the shaft sealing system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drum dryer in which a liquid raw material is adhered to a heated drum rotating in a chamber to be dried and solidified, and the solidified raw material is scraped by a scraper knife.

[0002]

2. Description of the Related Art Drum dryers as described above produce dried products such as chemical products, chemicals, foods, dye products, etc.
Among these, when abnormally high heat is applied during manufacturing,
There is something that causes quality deterioration.

Therefore, in recent years, vacuum type drum dryers have been attracting attention, in which raw materials are dried at a low temperature under a low vapor pressure under a low pressure so as not to give a harmful heat history during manufacturing. .

As shown in FIG. 7, a conventional vacuum type double drum dryer has drums (2a) (2) that rotate inwardly in a vacuum chamber (1) in a high temperature state.
Between the b), the liquid raw material (F) is supplied and adhered, and the raw material (F) is dried and solidified while the drums (2a) and (2b) rotate, and scraped by the scraper knife (4). It was done.

In such a drum dryer,
In order to maintain good adhesion of the raw material (F) to the drums (2a) and (2b), the dimension between the drums is as small as 0.1 to 2.0 mm depending on the viscosity of the raw material (F). Although it is within the range, it can be changed.

That is, as shown in FIG. 8, the drum (2
a) The rotating shafts (3a) and (3b) of (2b) are arranged outside the chamber (1) through the rotating shaft insertion hole (1a) formed in the chamber wall, and the rotating shaft on one side (3a) is supported by the apparatus main body via a bearing (5a), and the bearing (5b) provided at the end of the rotating shaft (3b) on the other side is rotated by the slide mechanism (6).
a) Slidably supported in a direction orthogonal to the axis of (3b). When the dimension between the drums is changed, the rotary shaft (3b) is slid together with the slide drum (2b) by the slide mechanism (6).

[0007]

By the way, in the conventional vacuum drum dryer, the rotary shafts (3a) (3a) (3a) (3a) (3a)
The shaft seal mechanisms (7a) and (7b) externally fitted to b) are fixed to the chamber wall by bolts. Then, when the dimension between the drums is changed, the shaft seal mechanism (7a) and (7b) are fixed.
After removing the bolt on the b) side once, the drum (2b)
Had to be slid to a predetermined position and then the bolts had to be fastened again, which was very complicated.

Further, in the prior art, since the bolt attaching / detaching work is complicated, the rotary shaft (3b) is often slid to change the dimension between the drums while the shaft seal mechanism (7b) is fixed to the chamber wall. was there. However, in this method, since the displacement of the rotating shaft (3b) is absorbed by the deformation of the elastic material in the shaft seal mechanism (7b), harmful strain occurs inside the shaft seal mechanism (7b), and The sealing mechanism (7b) may be damaged and airtightness may be destroyed, which is not preferable.

In the above description, a vacuum type drum dryer is taken as an example, but even a normal pressure type dryer dries foreign matter into the chamber from the outside or from the chamber to the outside. Since it is necessary to prevent the harmful substances from being discharged, the airtight structure similar to the above is adopted for the rotary shaft insertion portion of the chamber wall, and the same problem will occur.

The present invention solves the above-mentioned problems of the prior art and provides a drum dryer capable of easily changing the dimensions between a fixed drum and a rotating body such as a slide drum while maintaining good airtightness. The purpose is to provide.

[0011]

In order to achieve the above object, the drum dryer of the present invention has a liquid raw material adhered to a heated drum rotating in a chamber to be dried and solidified, and the solidified raw material is scraped by a scraper knife. In a drum dryer configured to scrape off, the rotary shaft end of a rotary body arranged in the chamber in parallel with the drum is arranged outside the chamber through a rotary shaft insertion hole formed in a chamber wall, The shaft end is slidably supported in a direction orthogonal to the axis of the shaft to allow the rotary body to move toward and away from the drum, and the shaft seal mechanism externally fitted to the rotary shaft end is provided. The position of the rotary shaft is fixed with respect to the rotary shaft, and a flexible or flexible sheet is provided between the shaft seal mechanism and the peripheral portion of the rotary shaft insertion hole of the chamber wall. Wood is intended to subject matter to become disposed in a closed form.

Further, in the present invention, it is preferable to use, as the sealing material, one formed of a flexible joint.

[0013]

In the drum dryer of the present invention, the end of the rotary shaft of the rotating body such as the slide drum is slidably supported, and the shaft seal mechanism fitted on the end of the rotary shaft is fixed in position with respect to the rotary shaft. A flexible or flexible sealing material, for example, a flexible joint or the like is hermetically disposed between the shaft sealing mechanism and the peripheral portion of the rotary shaft insertion hole of the chamber wall. Therefore, when the rotating body is slid, the shaft seal mechanism slides in conjunction with the rotary shaft, and the displacement of the rotary shaft is absorbed by the deformation of the flexible joint, which causes harmful strain in the shaft seal mechanism. There is nothing to do. Also,
In this way, complicated work such as bolt mounting / dismounting work is not required, and the dimension between the drum and the drum can be changed simply by sliding the rotating body.

[0014]

【Example】

<First Embodiment> FIG. 1 is a front sectional view showing a vacuum double drum dryer according to a first embodiment of the present invention, and FIG. 2 is a schematic horizontal sectional view of the drum dryer.

As shown in both figures, this drum dryer has a vacuum chamber (11), and inside the vacuum chamber (11), a fixed drum (20) and a slide drum (30) are mutually connected. Are arranged in parallel with each other.

The rotating shaft (21) of the drum (20) (30)
(31) is arranged outside the chamber through the rotary shaft insertion holes (12a) and (12b) formed in the chamber wall. Among them, the rotary shaft (21) on the fixed drum side
Is supported by the main body of the apparatus via a bearing (13a). Further, a shaft seal mechanism (14a) such as a vacuum seal mechanism is externally fitted to the rotary shaft (21), and the shaft seal mechanism (14a) is bolted to the peripheral edge portion of the rotary shaft insertion hole of the chamber wall. It is fixed.

The rotary shaft (31) on the slide drum side
The end portions of are supported by a slide mechanism (40), which will be described later, via bearings (13b). In FIG. 2, (15a) and (15b) are both rotary shafts (21) and (3).
The gears are attached to one end side of 1) and mesh with each other.

As shown in FIGS. 2 and 3, the slide mechanism (40) has a rail (41) extending in a direction perpendicular to the axis of the rotating shaft (31) and fixed to the apparatus body (10). The slide drum side bearing (13b) is fixed to the rail (41) via the slide plate (42).

By operating a slide amount adjusting mechanism (not shown), the rotary shaft (31) slides together with the slide drum (30) in a direction orthogonal to the axes of the rotary shafts (21) and (31), Slide drum (3
0) comes in contact with and separates from the fixed drum (20).

A shaft seal mechanism (14b) constituted by a vacuum seal mechanism or the like is externally fitted slightly inside the bearing mounting position of the rotary shaft (31), and the shaft seal mechanism (14b) is mounted on the bracket (32). ) Through the bearing (13
It is fixed to the outer peripheral part of b), whereby the shaft seal mechanism (1
4b) is fixed in position with respect to the bearing (13b), that is, the rotating shaft (31).

A flexible joint (50) is arranged between the chamber wall of the rotary shaft (31) and the shaft seal mechanism (14b) so that the rotary shaft (31) is inserted therethrough. One end of 50) has a bolt (51) on the periphery of the rotation shaft insertion hole of the chamber wall.
Is fixed by the shaft seal mechanism (1
4b) fixed by bolts (52).

On the other hand, as shown in FIG.
1) corresponds to the upper part of the drum (20) (30),
A beam (15) is formed that extends the full length of the drum. The chamber wall located on the side of the beam (15) is partially formed in a horizontal posture to form a scraper mechanism mounting portion (11a). There are a plurality of scraper mechanism mounting portions (11a) arranged at intervals along the beam longitudinal direction, and as shown in FIG. 4, each scraper mechanism mounting portion (11a) has a spindle insertion hole (1a).
1b) are respectively formed.

The beam (1
On the lower surface of 5), the shaft (61) is attached to the bracket (6
2) and is supported by this shaft (6
1), the plurality of scraper mechanism mounting portions (11
A plurality of scraper main bodies (70) are rotatably attached respectively corresponding to position a).
Further, a scraper knife (71) is attached to one piece of each scraper body (70).

At the peripheral edge of the spindle insertion hole of the scraper mechanism mounting portion (11a), a lower end outer circumference of a cylindrical cover (72) with an inverted U-shaped cross section and a lid is inserted through a sealing material such as a diaphragm (80). They are superposed, and the superposed portion is fixed to the scraper mechanism mounting portion (11a) together with the outer periphery of the diaphragm (80).

A threaded hole (72a) is formed in the upper wall of the spindle cover (72), and the threaded portion (73a) of the upper spindle (73) is screwed into the threaded hole (72a). There is. Further, a handle (74) is attached to the upper end of the upper spindle (73), and by rotating the handle (74),
The upper spindle (73) moves along the axial direction while rotating around the axis according to the amount of rotation.

Inside the spindle cover (72), an upper spring holder (73b) and a lower spring holder (73c) are fitted onto the upper spindle (73) so as to be rotatable about an axis. There is. A compression spring (73d) is interposed between the spring receivers (73b) (73c), and the springs (73d) urge the spring receivers (73b) (73c) in a direction in which they are separated from each other. There is. In this case, the upper spring receiver (73b) is locked to the lower end of the threaded portion (73a) of the upper spindle (73), and the lower spring receiver (73c) is attached to the lower end of the upper spindle (73). By being locked to the fixed fixture (73e), the axial movement of both spring receivers (73b) (73c) is restricted.

As shown in FIG. 5, the connecting spindle (75) disposed below the upper spindle (73) has a bottomed cylindrical main body (75a) and a center of the bottom wall of the main body (75a). It has the shaft part (75b) with a screw provided in a row.
The flange portion (75c) formed on the outer periphery of the upper end of the main body (75a) is fixed to the lower surface of the lower spring support member (73c) by bolting.

The threaded shaft portion (7) of the connecting spindle (75)
5b) is a central hole (80) of the diaphragm (80).
a) through which the washer (81) and washer (8) are placed on the threaded shank (75b).
The lock nut (83) and the turnbuckle type special connection nut (84) are fastened via 2). As a result, the shaft portion (75b) of the connecting spindle (75) is fixed to the peripheral edge portion of the central hole of the diaphragm (80).

Further, a threaded portion (85b) provided on the upper end of the lower spindle (85) is screwed into the lower portion of the special connection nut (84) through a lock nut (86). As shown in 4, the lower spindle (8
The lower end of 5) is attached to the other piece of the scraper body (70) with some play provided in the axial direction.

On the inner peripheral surface of the spindle cover (72),
A rotation stopper (87) is fixed to the rotation stopper (87) so that the outer peripheral portion of the lower spring receiver (73c) is restricted from rotating about its axis while being allowed to slide vertically. To be installed.

Then, as described above, the handle (74)
When the upper spindle (73) is rotated in the axial direction while rotating the upper spindle (73) about the axis, the upper spindle (73) rotates about the axis with respect to the lower spring receiver (73c). The rotation about the axis is not transmitted to the connecting spindle (75) and thereafter, and only the axial movement is transmitted to the connecting spindle (75) and the lower spindle (85) via the spring receivers (73b) (73c). . In this way, when the spindles (75) (85) move axially while being prevented from rotating about their axes, the scraper body (70) rotates and the scraper knives (7) move.
1) comes into contact with and separates from the outer peripheral surfaces of the drums 20, 20. At this time, the diaphragm (80) fixed to the connecting spindle (75) moves to the spindle (7).
Since it bends up and down so as to follow 5), the forward and backward movement of the spindle is not hindered.

Returning to FIG. 1, the raw material supply mechanism (16) drawn into the chamber from the upper part of the chamber (11).
Are arranged above the raw material supply section (16a) formed between the drums (20) and (30). Further, conveyors (17) for transporting the scraping material (F) to a predetermined location are disposed below the scraper knives (71) on both sides of the drums (20) and (30).

In this drum dryer, when the liquid raw material is dried, the inside of the chamber (11) is first kept in a vacuum state by a vacuum mechanism (not shown), and then the drums (20) (30) are heated. And rotate.

Subsequently, the liquid material (F) is supplied from the material supply mechanism (16) to the material supply section (16a) and adhered to the surfaces of the drums (20) and (30).

Then, by rotating the handle (74), the spindles (73) (75) (85) are lowered,
Replace the scraper knife (71) with the drum (20) (30)
Low pressure contact with the surface of. Then, when the knife (71) becomes familiar, the handle (74) is operated again to bring the knife (71) into contact with the drums (20) and (30) at high pressure.

As a result, the dry raw material (F) attached to the drums (20) and (30) is transferred to the scraper knife (71).
It is scraped off by and is collected at a predetermined place via the conveyor (17).

On the other hand, when the operation of the apparatus is stopped, the reverse operation to the above is performed. That is, the supply of the raw material (F) is stopped, and then the drum (20) (30) of the knife (71).
After changing the contact pressure to the low pressure once,
Remove 1) from the drums (20) (30).

In this drum dryer, the dimension between the drums (20) and (30) is determined by the slide drum (30).
You can easily change it just by sliding. In this case, as shown in FIG. 2, the shaft seal mechanism (14
Since b) is fixed to the bearing (13b) via the bracket (32), it slides in conjunction with the rotating shaft (31) and the rotating shaft (31) generated by the sliding.
The displacement is absorbed by the deformation of the flexible joint (50). Therefore, the shaft seal mechanism (14b)
No harmful strain is generated in the mechanism (14
It is possible to prevent the damage of b) and maintain good airtightness.

Needless to say, the shaft seal mechanism (14
Since the gap between b) and the chamber wall is sealed by the flexible joint (50), the airtightness of the gap is kept good.

Further, in the spindle portion of the scraper mechanism, as shown in FIG. 4, the connecting spindle (75)
Since the peripheral edge of the central hole of the diaphragm (80) is fixed to the outer periphery of the spindle (80) and the outer peripheral edge of the diaphragm (80) is fixed to the peripheral edge of the spindle insertion hole of the chamber (11), the spindle (75) moves forward and backward. Then, the diaphragm (80) will bend so as to follow the spindle (75). Therefore, the rubbing portion is eliminated between the spindle (75) and the diaphragm (80) so that a perfect seal can be achieved, good airtightness can be maintained, and dust and water can be prevented from entering between them. It is also possible to prevent damage to the spindle (75), the diaphragm (80), etc. and the occurrence of rust. Furthermore, since the damage of the seal portion can be prevented, maintenance and inspection of the seal portion becomes unnecessary, and maintenance-free can be realized.

Moreover, of the spindle mechanism, the spring (73d) and the like, which are easily affected by the adhesion of dust or the like, are covered by the spindle cover (72).
It is possible to prevent dust from adhering to the spring (73d) and the like, and effectively prevent damage and the like.

<Second Embodiment> FIG. 6 is a schematic front sectional view showing a normal pressure type single drum dryer according to a second embodiment of the present invention. As shown in the figure, in this drum dryer, the feed roll (130) corresponds to the slide drum (30) of the first embodiment, and the roll (130) has the same mechanism as above. It is adapted to come into contact with and separate from the drum (120). Furthermore, the rotary shaft (131) of the roll (130) and the rotary shaft insertion hole of the chamber (111) are hermetically sealed by the same mechanism as described above.

On the other hand, in the scraper mechanism, the beam (115) is provided with a fluid pressure cylinder such as an air cylinder (151).
The main body (152) of (1) is rotatably attached to the inner peripheral surface of the beam (115), and the cylinder rod (153) passes through a rod insertion hole (115a) formed in the beam (115) to form a chamber (111). ) Is placed inside.

The inner peripheral edge of the central hole of the diaphragm (180) is fixed to the cylinder rod (153), and the outer peripheral edge of the diaphragm (180) is fixed to the beam (11).
It is fixed to the peripheral portion of the spindle insertion hole of 5).

In the chamber (111),
On one side of the beam (115) is a bracket (162)
The shaft (161) is supported via the shaft (161), and the scraper body (170) is rotatably attached to the shaft (161).

On one piece of the scraper body (170),
A scraper knife (171) is attached, and the tip of the cylinder rod (153) is rotatably attached to the other piece. When the cylinder (151) is driven back and forth, the scraper body (17
0) rotates so that the scraper knife (171) comes into contact with and separates from the drum (120).

In this drum dryer, the raw material (F) supplied from the raw material supply mechanism (116) into the raw material supply section (116a) once adheres to the outer surface of the feed roll (130), and then the drum (120). ) On the outer surface. Then, the raw material (F) is dried and solidified while the drum (120) rotates, and then scraped off sequentially by the scraper knife (171), and the conveyor (1).
It is collected at a predetermined place via 17).

In this drum dryer as well, since the same structure as that of the first embodiment is adopted in the rotary shaft insertion portion of the feed roll (130) in the chamber (111), the airtightness of that portion is good. Therefore, it is possible to prevent foreign matter from entering the chamber (111) and prevent harmful substances from being discharged, and it is possible to easily perform a size change operation between the drum (120) and the feed roll (130).

Further, since the diaphragm (180) attached to the periphery of the rod insertion hole of the chamber (111) is fixed to the cylinder rod (153), the rod (1
The space between 53) and the diaphragm (180) can be completely sealed, and good airtightness can be maintained.

Furthermore, since the scraper drive unit such as the cylinder body (152) is housed in the closed space such as the beam (115), dust and the like can be prevented from entering the beam (115). It is possible to prevent the scraper drive unit from being damaged due to the adhesion of dust.

Further, in this structure, the beam (115)
By supplying an inert gas such as nitrogen to the inside and setting the internal pressure to be higher than the external pressure, it is possible to more reliably prevent dust from entering the beam (115).

By the way, when the cylinder (151) is used as the scraper driving unit as in this embodiment, it is possible to surely obtain the sheet-shaped dry raw material as described below.

That is, when a handle type is used for operating the scraper, as shown by the imaginary line in the figure,
It is necessary to arrange the handle (174) on the outer surface of the chamber (111) in consideration of handle operability. At this time, the handle (174) and the scraper body (170)
The spindle (175) connecting with is the knife (171)
Will be placed below the knife (171)
The sheet-shaped dry raw material (F) scraped off by the film is locked by the spindle (175) and torn, and becomes a small piece-shaped dry raw material, making it impossible to obtain a sheet-shaped dry raw material. It will be.

On the other hand, in this embodiment, the cylinder (15
1) is used, it is not necessary to consider the operability and the like, and the cylinder (151) can be attached at any position. As shown, the cylinder (151) can be installed under the drum (120). With the above arrangement, the cylinder rod (153) can be removed from below the knife (171), and a sheet-shaped dry raw material can be obtained.

Moreover, as described above, the cylinder (151)
Since the mounting position of is not restricted, the cylinder (151)
Can be placed in the conventional surplus space etc.,
The device can be made compact.

In the present invention, the flexible joint is used as the seal material for the shaft seal portion of the rotating body, but the seal material is not limited thereto, and any seal may be used as long as it has flexibility or flexibility. Wood may be used.

Further, the sealing material used for the shaft sealing portion of the scraper mechanism is not limited to the diaphragm, and other sealing materials such as a bellows seal may be used.

Further, the present invention is not limited to the above embodiment, but can be applied to a vacuum type single drum dryer as well as an atmospheric pressure type double drum dryer.

[0059]

According to the drum dryer of the present invention,
The rotary shaft end of the rotating body is slidably supported, and the shaft seal mechanism externally fitted to the rotary shaft end is fixed in position with respect to the rotary shaft. Since a flexible or flexible sealing material, for example, a flexible joint or the like, is arranged in a sealed manner between and, the shaft seal mechanism slides in conjunction with the rotating shaft when the rotating body slides, The displacement of the rotary shaft is absorbed by the deformation of the flexible joint, and no harmful strain is generated in the shaft seal mechanism. Therefore, the dimension between the drum and the drum can be easily changed only by sliding the rotating body, without requiring complicated work such as bolt attachment / detachment work. Furthermore, since the rotary shaft and the peripheral portion of the rotary shaft insertion hole are sealed by the shaft seal mechanism and the flexible joint, the effect that the airtightness can be kept good can be obtained.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a drum dryer according to a first embodiment of the present invention.

FIG. 2 is a schematic horizontal sectional view showing the drum dryer of the first embodiment.

FIG. 3 is a sectional view showing a shaft end mechanism portion of the slide drum in the first embodiment.

FIG. 4 is a sectional view showing a scraper mechanism portion in the first embodiment.

FIG. 5 is an exploded sectional view showing a spindle connecting portion of the scraper mechanism portion of the first embodiment.

FIG. 6 is a schematic front sectional view showing a drum dryer which is a second embodiment of the present invention.

FIG. 7 is a schematic front sectional view showing a conventional drum dryer.

FIG. 8 is a schematic horizontal sectional view showing a conventional drum dryer.

[Explanation of symbols]

 11, 111 ... Chamber 12b ... Rotating shaft insertion hole 13b ... Bearing 14b ... Shaft sealing mechanism 20, 120 ... Fixed drum 30 ... Slide drum 31, 131 ... Rotating shaft 40 ... Slide mechanism 50 ... Flexible joint 71, 171 ... Scraper knife 130 … Feed roll F… Raw material

Claims (2)

[Claims] 1. A drum dryer in which a liquid raw material is adhered to a heated drum rotating in a chamber to dry and solidify the solidified raw material, and the solidified raw material is scraped off by a scraper knife. The rotating shaft end of the arranged rotating body is arranged outside the chamber through a rotating shaft insertion hole formed in the chamber wall, and the rotating shaft end is slidably supported in a direction orthogonal to its axis. The rotary body is allowed to move toward and away from the drum, and the shaft seal mechanism externally fitted to the end of the rotary shaft is fixed in position with respect to the rotary shaft, so that the shaft seal mechanism and the chamber wall rotate. A drum dryer, characterized in that a flexible or flexible sealing material is hermetically disposed between the peripheral edge portion of the shaft insertion hole. 2. The drum dryer according to claim 1, wherein the sealing material is a flexible joint.