JP2641378B2 - Drum dryer - Google Patents

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 material is adhered to a heated drum rotating in a chamber, dried and solidified, and the solidified material is scraped off by a scraper knife.

[0002]

2. Description of the Related Art Dry products such as chemical products, chemicals, foods, and dye products are manufactured by the above-mentioned drum dryer.
Some of these are exposed to abnormally high heat during production,
Some may cause quality deterioration.

Therefore, in recent years, a vacuum-type drum dryer in which a raw material is dried at a low pressure under a low vapor pressure so as not to give a harmful heat history during the production has attracted attention. .

As shown in FIG. 7, a conventional vacuum type double drum dryer includes two drums (2a) and (2) rotating in a high temperature state in a vacuum chamber (1).
During the period of 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 off by the scraper knife (4). It was done.

[0005] 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 very small, such as 0.1 to 2.0 mm, depending on the viscosity of the raw material (F). Although it is within a certain range, it can be changed.

That is, as shown in FIG.
a) The end of the rotating shaft (3a) (3b) of (2b) is disposed outside the chamber (1) through a rotating shaft insertion hole (1a) formed in the chamber wall, and one of the rotating shafts (3a) is supported by the apparatus main body via a bearing (5a), and the bearing (5b) provided at the end of the other rotating shaft (3b) is rotated by the sliding mechanism (6).
a) It is slidably supported in a direction perpendicular to the axis of (3b). When the inter-drum dimensions are changed, the rotary shaft (3b) is slid by the slide mechanism (6) together with the slide drum (2b).

[0007]

By the way, in the conventional vacuum drum dryer, the rotary shafts (3a) and (3) are used to hermetically seal the rotary shaft insertion portion in the chamber (1).
The shaft seal mechanisms (7a) and (7b) externally fitted to the shaft seal mechanism (b) are fixed to the chamber wall by bolts. When the dimension between the drums is changed, the shaft seal mechanism (7
After removing the bolt on the b) side, the drum (2b)
Must be slid to a predetermined position, and then the bolts must be fastened again, which is very complicated.

[0008] In the prior art, since the bolt removal work is complicated, the rotating shaft (3b) is often slid while the shaft sealing mechanism (7b) is fixed to the chamber wall to change the dimension between the drums. 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 sealing mechanism (7b), harmful strain is generated inside the shaft sealing mechanism (7b), and the shaft is damaged. The sealing mechanism (7b) may be damaged and the airtightness may be destroyed, which is not preferable.

In the above description, a vacuum-type drum dryer is taken as an example. However, even with a normal-pressure-type drum dryer, foreign matter enters the inside of the chamber from the outside or from the inside of the chamber to the outside. Since it is necessary to prevent the release of harmful substances, the same airtight structure as described above is employed in the portion of the chamber wall through which the rotating shaft is inserted, and the same problem occurs.

The present invention solves the above-mentioned problems of the prior art, and provides a drum dryer that can easily change 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-mentioned object, a drum dryer according to the present invention deposits a liquid material on a heated drum rotating in a chamber, solidifies it by drying, and uses the scraper knife to solidify the solid material. In a drum dryer designed to scrape off, a rotating shaft end of a rotating body disposed in parallel with the drum in the chamber is disposed outside the chamber through a rotating shaft insertion hole formed in a chamber wall, and The shaft end is slidably supported in a direction perpendicular to the axis thereof, and the moving body is allowed to move toward and away from the drum, and a shaft seal mechanism externally fitted to the rotating shaft end is provided. A flexible or flexible seal is fixed between the shaft seal mechanism and the periphery of the 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 a sealing member made of a flexible joint.

[0013]

According to the drum dryer of the present invention, the end of the rotating shaft of a rotating body such as a slide drum is slidably supported, and a shaft seal mechanism externally fitted to the end of the rotating shaft is fixed to the rotating shaft. A flexible or flexible sealing material, such as a flexible joint, is hermetically disposed between the shaft seal mechanism and the peripheral edge of the rotary shaft insertion hole of the chamber wall. Therefore, when the rotating body is slid, the shaft sealing mechanism slides in conjunction with the rotating shaft, and the displacement of the rotating shaft is absorbed by the deformation of the flexible joint, causing harmful distortion in the shaft sealing mechanism. I will not do it. Also,
As described above, a complicated operation such as a bolt attaching / detaching operation is not required, and the dimension between the drum and the drum can be changed only by sliding the rotating body.

[0014]

【Example】

<First Embodiment> FIG. 1 is a front sectional view showing a vacuum type 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), in which a fixed drum (20) and a slide drum (30) are mutually reciprocated. Are arranged in parallel.

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

Also, a rotary shaft (31) on the slide drum side
Are respectively supported by a slide mechanism (40) described later via a bearing (13b). In FIG. 2, (15a) and (15b) correspond to both rotating shafts (21) and (3).
The gears are attached to one end of each 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 bearing (13b) on the slide drum side is fixed to the rail (41) via a slide plate (42).

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

A shaft seal mechanism (14b) constituted by a vacuum seal mechanism or the like is fitted outside the bearing mounting position of the rotary shaft (31), and the shaft seal mechanism (14b) is attached to the bracket (32). ) Through the bearing (13)
b) is fixed to the outer periphery of 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 disposed between the chamber wall of the rotating shaft (31) and the shaft sealing mechanism (14b) so that the rotating shaft (31) is inserted therethrough. One end of the bolt (51) is attached to the periphery of the rotary shaft insertion hole in the chamber wall.
And the other end of the shaft seal mechanism (1
4b) is fixed by bolts (52).

On the other hand, as shown in FIG.
In 1), corresponding to the upper parts of the drums (20) and (30),
A beam (15) is formed which extends over the entire 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). A plurality of the scraper mechanism mounting portions (11a) are present at intervals along the beam longitudinal direction. As shown in FIG. 4, each of the scraper mechanism mounting portions (11a) has a spindle insertion hole (1a).
1b) are formed.

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

The outer periphery of the lower end of a closed cylindrical spindle cover (72) having an inverted U-shaped cross section is formed around the periphery of the spindle insertion hole of the scraper mechanism mounting portion (11a) through a sealing material such as a diaphragm (80). The overlapping portions are fixed to the scraper mechanism attaching 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 a threaded portion (73a) of the upper spindle (73) is screwed into the threaded hole (72a). I have. 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 rotation amount.

Inside the spindle cover (72), an upper spring receiving member (73b) and a lower spring receiving member (73c) are fitted to the upper spindle (73) so as to be rotatable around an axis. I have. A compression spring (73d) is interposed between the spring receivers (73b) and (73c), and the springs (73d) urge the spring receivers (73b) and (73c) in a direction of separating from each other. I have. 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). The movement of the spring receiving members (73b) and (73c) in the axial direction is restricted by being locked by the fixed fixing member (73e).

As shown in FIG. 5, the connecting spindle (75) arranged below the upper spindle (73) has a bottomed cylindrical main body (75a) and a central portion of the bottom wall of the main body (75a). And a threaded shaft portion (75b) provided continuously.
A flange (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 holder (73c) by bolting.

The threaded shaft (7) of the connecting spindle (75)
5b) is a central hole (80) of the diaphragm (80).
a) and placed in the chamber with its threaded shaft (75b) on the washer (81) and washer (8).
Through 2), a lock nut (83) and a special connection nut (84) of a turnbuckle type are fastened. As a result, the shaft portion (75b) of the connecting spindle (75) is fixed to the periphery of the central hole of the diaphragm (80).

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

On the inner peripheral surface of the spindle cover (72),
A rotation stopper (87) is fixed, and the outer periphery of the lower spring receiving member (73c) is allowed to slide in the vertical direction while rotation around the axis is restricted. It is attached so that.

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 by rotating the upper spindle (73), the upper spindle (73) rotates about the axis with respect to the lower spring holder (73c). The rotation about the axis is not transmitted to the connection spindle (75) and subsequent portions, and only the axial movement is transmitted to the connection spindle (75) and the lower spindle (85) via the spring receivers (73b) (73c). . Thus, when the spindles (75) and (85) move in the axial direction while rotation around the axis is prevented, the scraper body (70) rotates and the scraper knife (7) is rotated.
1) comes into contact with and separates from the outer peripheral surfaces of the drums (20) and (30). At this time, the diaphragm (80) fixed to the connecting spindle (75) is moved to the spindle (7).
Since it bends up and down to follow 5), the advance and retreat movement of the spindle is not hindered.

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

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

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

Next, the spindles (73), (75) and (85) are lowered by rotating the handle (74).
Scraper knife (71) to drum (20) (30)
Contact with low pressure surface. When the knife (71) is 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 dried raw material (F) attached to the drums (20) and (30) is removed from the scraper knife (71).
And collected at a predetermined location via a conveyor (17).

On the other hand, when the operation of the apparatus is stopped, the reverse operation is performed. That is, the supply of the raw material (F) is stopped, and then the drums (20) and (30) of the knife (71) are stopped.
After switching the contact pressure to the low pressure once, the knife (7
1) is released from the drums (20) and (30).

In this drum dryer, the dimension between the drums (20) and (30) is the same as that of the slide drum (30).
By simply sliding, you can easily change it. In this case, as shown in FIG.
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.
Is absorbed by the deformation of the flexible joint (50). Therefore, the shaft sealing mechanism (14b)
No harmful strain is generated in the mechanism (14).
The damage of b) can be prevented, and the airtightness can be kept good.

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.

In the spindle portion of the scraper mechanism, as shown in FIG.
The outer periphery of the diaphragm (80) is fixed to the outer periphery of the center hole, and the outer periphery of the diaphragm (80) is fixed to the periphery of the spindle insertion hole of the chamber (11). Then, the diaphragm (80) bends to follow the spindle (75). Therefore, there is no rubbing portion between the spindle (75) and the diaphragm (80), and a complete seal is achieved. As a result, good airtightness can be maintained and dust and moisture can be prevented from entering between them. In addition, damage to the spindle (75), the diaphragm (80), and the like, and generation of rust can be prevented. Further, since such damage to the seal portion can be prevented, maintenance and inspection of the seal portion become unnecessary, and maintenance-free operation can be realized.

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

<Second Embodiment> FIG. 6 is a schematic front sectional view showing a normal-pressure 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) is driven by the same mechanism as described above. It is configured to come into contact with and separate from the drum (120). Further, the space between the rotation shaft (131) of the roll (130) and the rotation shaft insertion hole of the chamber (111) is hermetically sealed by the same mechanism as described above.

On the other hand, in the scraper mechanism, a hydraulic cylinder such as an air cylinder (151) is disposed on the beam (115), and the cylinder (15)
The 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), and the chamber (111). ).

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

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

One piece of the scraper body (170) has
A scraper knife (171) is attached, and a tip of the cylinder rod (153) is rotatably attached to the other piece. When the cylinder (151) moves forward and backward, the scraper body (17) is driven.
0) is rotated so that the scraper knife (171) moves toward and away from the drum (120).

In this drum drier, 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). ) Adheres to the outer surface. Then, the raw material (F) is dried and solidified while the drum (120) is rotating, and then is scraped off sequentially by a scraper knife (171), and is conveyed to the conveyor (1).
17) and collected at a predetermined location.

Also in this drum dryer, the same structure as that of the first embodiment is employed for the portion of the feed roller (130) inserted in the chamber (111) through which the rotary shaft is inserted, so that the airtightness of the portion is good. In addition, it is possible to prevent foreign substances from entering the chamber (111), release of harmful substances, and the like, and to easily perform a dimension 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)
53) and the diaphragm (180) can be completely sealed, and good airtightness can be maintained.

Further, since the scraper driving section such as the cylinder body (152) is housed in the closed space such as the beam (115), dust and the like are prevented from entering the beam (115). In addition, it is possible to prevent the scraper driving section from being damaged due to the adhesion of dust.

In this configuration, the beam (115)
If an inert gas such as nitrogen is supplied to the inside and the internal pressure is set higher than the external pressure, it is possible to more reliably prevent dust from entering the beam (115).

When a cylinder (151) is used as a scraper driving unit as in this embodiment, a sheet-shaped dry raw material can be obtained reliably as described below.

That is, when a handle type is used for operating the scraper, as shown in the imaginary line in FIG.
It is necessary to dispose 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)
Spindle (175) is connected to the knife (171)
Knife (171)
The sheet-like dry raw material (F) scraped off by the above is locked by the spindle (175) and is torn, resulting in a small-piece-like dry raw material, which makes it impossible to obtain a sheet-like dry raw material. It will be.

On the other hand, in this embodiment, a cylinder (15
Since 1) is used, there is no need to consider the operability and the like, and the cylinder (151) can be attached to any position, and the cylinder (151) is placed below the drum (120) as shown in the figure. , The cylinder rod (153) can be removed from below the knife (171), and a sheet-shaped dry raw material can be obtained.

In addition, the cylinder (151)
Since the mounting position of the cylinder (151) is not restricted,
Can be placed in a conventional surplus space, etc.,
The device can be made compact.

In the present invention, a flexible joint is used as a sealing material for the shaft sealing portion of the rotating body. However, the present invention is not limited to this, and any flexible or flexible sealing material may be used. A material may be used.

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

The present invention is not limited to the above-described embodiment, but can be applied not only to a vacuum type single drum dryer but also to a normal pressure type double drum dryer.

[0059]

According to the drum dryer of the present invention,
The end of the rotating shaft of the rotating body is slidably supported, and a shaft seal mechanism externally fitted to the end of the rotating shaft is fixed in position with respect to the rotating shaft. In between, a flexible or flexible sealing material, for example, a flexible joint or the like is arranged in a hermetically sealed manner, so that when the rotating body slides, the shaft seal mechanism slides in conjunction with the rotating shaft, The displacement of the rotating shaft is absorbed by the deformation of the flexible joint, and no harmful distortion occurs in the shaft sealing mechanism. Therefore, it is possible to easily change the dimension between the drum and the rotating body only by sliding the rotating body without requiring a complicated operation such as a bolt attaching / detaching operation. Further, the space between the rotary shaft and the peripheral edge of the rotary shaft insertion hole is sealed by the shaft seal mechanism and the flexible joint, so that an effect that good airtightness can be maintained can be obtained.

[Brief description of the 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 of the slide drum in the first embodiment.

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

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

FIG. 6 is a schematic front sectional view showing a drum dryer according to 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: rotary shaft insertion hole 13b: bearing 14b: shaft seal mechanism 20, 120: fixed drum 30: slide drum 31, 131: rotary shaft 40: slide mechanism 50: flexible joint 71, 171: scraper knife 130 … Feed roll F… raw material

Claims (2)

(57) [Claims] 1. A drum dryer in which a liquid material is adhered to a heated drum rotating in a chamber and dried and solidified, and the solidified material is scraped off by a scraper knife. The rotating shaft end of the arranged rotating body is disposed 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 the axis thereof. The rotating body is allowed to move toward and away from the drum, and a shaft seal mechanism externally fitted to the end of the rotating shaft is fixed in position with respect to a rotating shaft, and rotation of the shaft sealing mechanism and the chamber wall is performed. A drum dryer characterized in that a flexible or flexible sealing material is hermetically disposed between a shaft insertion hole peripheral edge and the shaft insertion hole. 2. The drum dryer according to claim 1, wherein the sealing material is constituted by a flexible joint.