KR100853152B1 - A centrifugal screw press - Google Patents

Abstract

A centrifugal screw dehydrator is provided to process sludge having a high moisture content and to dehydrate the sludge such that the sludge has a moisture content less than 40%. A centrifugal screw dehydrator comprises a hollow casing(5), a centrifugal dehydrating section(30) having a rotatable cylindrical screen, a compressive dehydrating section(50) having a rotatable screw shaft(10), and a sludge moving section(90). The centrifugal dehydrating section is provided at one side thereof with a first driving unit(34) to drive the screen. The compressive dehydrating section includes a second driving unit(55) to drive the rotatable screw shaft. The sludge moving section forms a sludge inlet path(92) in the interior of the screw shaft and includes a dehydrating path(94) positioned between the screw shaft and the cylindrical screen.

Description

Centrifugal Screw Dehydrator {A Centrifugal Screw Press}

The present invention relates to a dehydrator capable of separating fluids and solids from sludge, and more particularly, to a centrifugal screw dehydrator that is improved to effectively separate fluids and solids from sludge introduced therein by centrifugal and compressive forces. will be.

A general sludge dehydrator has a sludge storage tank in which sludge as an organic material is stored, and a cylindrical rotator is installed in the sludge storage tank. A vacuum apparatus is provided on the inner side of the rotator to absorb the sap of the sludge adhering to the outer circumference of the rotator.

In addition, one side of the sludge storage tank is provided with a scraper (scraper) for removing the cake from which the sap is separated. Of course, only the sap is sucked by the vacuum on the outer circumference of the rotator, the fine hole or screen is formed or arranged so that the sludge leaving the sap remains in the form of a cake.

Such a conventional sludge dehydrator rotates the rotator in a state in which sludge is accumulated in the sludge storage tank, and the sludge is buried in the outer circumference of the rotator. At this time, when the vacuum apparatus is driven, the sap contained in the sludge buried in the outer circumference of the rotator is separated by vacuum, and only the sludge dried to some extent remains. As the rotator rotates, the sludge dried by the scraper is separated from the rotator and stored in a separate reservoir.

Such conventional sludge dewatering resin is always vacuumed on the outer circumference of the rotator by the continuous operation of the vacuum device to separate the fluid from the sludge. According to this method, there is a problem in that the micropores of the screen provided in the rotator are blocked by sludge and the separation efficiency of the sap decreases.

Therefore, the conventional sludge dehydrator cannot be used continuously for a long time, and it is inconvenient to repair the sludge dehydrator from time to time in order to increase the vacuum efficiency.

In addition, in order to solve this problem, it is necessary to equip the vacuum device with a large capacity, there is a problem that the installation cost is increased.

In addition, in order to separate the caked sludge from the rotator, a scraper must be separately prepared, and thus, the structure is complicated, and there is a problem that a defect may occur due to failure or breakage of the scraper.

Alternatively, centrifugal decanters using only a centrifugal force without using a vacuum device are also proposed. Such a conventional centrifugal dehydrator is to be dehydrated by applying a centrifugal force of at least 2,000G ~ 3,000G or more. Therefore, such a conventional centrifugal dehydrator requires a large-capacity motor that rotates at a high speed, and the desired sludge dehydration effect can be obtained only when the apparatus is enlarged more than necessary. In addition, such a conventional centrifugal dehydrator is a dehydration action is performed using only the centrifugal force is a situation that the high dehydration of water content of 40% or less is not achieved.

In addition, the conventional screw dehydrator for solving the problem of the centrifugal dehydrator has been proposed. Such a conventional screw-type dehydrator can obtain a high dehydration effect of 40% or less of water content, but there is a problem in that initial sludge having a high content of sap is difficult to solidify at an initial stage, so that dehydration is impossible. That is, the sludge from which the sap is removed to some extent is capable of highly dehydrated water having a water content of 40% or less.

The present invention is to solve the above problems, the object of the present invention is to provide a centrifugal screw dehydrator capable of high sludge dehydration of 40% or less moisture as well as the treatment of sludge having a high content of sap.

Another object of the present invention is to provide an improved centrifugal screw dehydrator capable of effectively separating sap and solids from sludge even in a small size.

In order to achieve the above object, the present invention, in the dehydrator was able to separate the sap and solids from the sludge,

Hollow casing;

A centrifugal dewatering unit having a cylindrical screen rotatable inside the casing, and having one side having first driving means for rotating the screen;

A compression dewatering portion having a screw shaft rotatably disposed coaxially within the cylindrical screen and having a second drive means for rotating the screw shaft; And

A sludge inflow passage formed into the screw shaft, a sludge dewatering passage formed between the screw shaft and the cylindrical screen, a drainage channel formed between the cylindrical screen and the casing, and a sludge formed between the screw shaft and the casing It provides a centrifugal screw dehydrator comprising a sludge moving unit having a cake discharge passage to separate the sap and solids from the sludge by the centrifugal force and the compressive force.

And the present invention preferably provides a centrifugal screw dehydrator, characterized in that the casing is inclined on the pedestal, the sludge cake outlet is formed at the high end of the casing, the fluid outlet is formed at the low end of the casing.

In another aspect, the present invention preferably provides a centrifugal screw dehydrator, characterized in that the sludge inlet of the screw shaft is disposed at the highest portion, the sludge moves the sludge inlet passage by its own weight.

And the present invention is preferably the centrifugal dewatering portion is mounted so that the cylindrical screen is rotatable through the bearing relative to the casing, the first drive means is made of a motor, the drive pulley of the motor is connected to the belt, the belt Is connected to the driven pulley provided at one end of the cylindrical screen provides a centrifugal screw dehydrator, characterized in that the cylindrical screen is rotated by the operation of the first drive means.

In addition, the present invention preferably is such that the compression dewatering screw shaft is rotatably mounted with respect to the cylindrical screen through a sleeve bearing, and the second drive means rotates the screw shaft by shifting the rotational force transmitted from the first drive means. It provides a centrifugal screw dehydrator, characterized in that the transfer.

And the present invention preferably the second drive means is a belt connected to the driven pulley of the cylindrical screen, an input shaft is connected to the belt and one end of the intermediate shaft coaxial with the screw shaft to the output shaft through the belt A linked transmission and the other end of the intermediate shaft are connected to the screw shaft via a reducer to rotate the screw shaft at a different speed than the cylindrical screen.

In addition, the present invention preferably the reducer is connected to the center sun gear is connected to the intermediate shaft, the driven pull ring ring of the cylindrical screen, the screw shaft is connected to a plurality of planetary gears screw from the intermediate shaft It provides a centrifugal screw dehydrator, characterized in that the deceleration is made toward the axis.

And the present invention preferably provides a centrifugal screw dehydrator, characterized in that the sludge moving unit further comprises a valve means for opening and closing the sludge dewatering passage on the outlet side of the sludge dewatering passage.

In another aspect, the present invention preferably has a valve means having a plurality of cylinders the body is fixed to the upper end of the casing, is connected to the rod of the cylinder has a stopper ring capable of forward and backward movement, stopper ring by the operation of the cylinder It provides a centrifugal screw dehydrator, characterized in that for opening and closing the sludge dehydration passage.

And the present invention preferably provides a centrifugal screw dehydrator, characterized in that the cylinder is made of a pneumatic cylinder, the stopper ring is formed with a conical inclined surface to reduce the discharge resistance of the sludge.

In another aspect, the present invention preferably provides a centrifugal screw dehydrator, characterized in that the stopper ring is configured to be linearly movable by being slidably inserted into a plurality of guide bars fixed to the casing.

According to the centrifugal screw dehydrator according to the present invention, since the sludge is dehydrated by using both the centrifugal force and the compressive force simultaneously, the sludge having a high content of sap is processed, and the sludge dewatering of 40% or less of water content is obtained.

In addition, according to the present invention, the centrifugal force and the compressive force are used simultaneously, and the cylindrical screen and the screw shaft are differentially rotated by using a single motor, thereby achieving an improved effect of effectively separating the sap and the solids from the sludge even at a small size. .

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

Centrifugal screw dehydrator 1 according to the present invention is a device that can effectively separate the sap and solids from the sludge by using the centrifugal force and the compressive force.

The centrifugal screw dehydrator 1 according to the invention has a hollow casing 5, as shown in FIGS. 1 and 2. The casing 5 is arranged obliquely on the pedestal 7, the sludge inlet 12 of the screw shaft 10 is arranged at the highest part, and the sludge is explained later by self-weight from the sludge inlet 12. The inclined downward movement along the sludge inflow passage 92 becomes.

In addition, the casing 5 has a structure in which a sludge cake outlet 14 is formed at a high end, and a sap outlet 16 is formed at a low end of the casing 5.

And the present invention has a cylindrical screen (32) rotatable inside the casing (5), one side is provided with a centrifugal dewatering portion (30) having a first drive means 34 for rotating the screen (32) do.

The centrifugal dewatering section 30 separates the sap from the sludge by centrifugal force, and a cylindrical screen 32 coaxially disposed with the casing 5 rotates through the bearing B with respect to the casing 5. It is equipped to be possible.

And the cylindrical screen 32 as described above is rotated by the first drive means 34 made of a motor, the motor is disposed separately on the side of the casing 5, as shown in Figure 2, A belt 38 is connected to the driving pulley 36, and the belt 38 is connected to a driven pulley 40 provided at one end of the cylindrical screen 32.

Accordingly, the cylindrical screen 32 is rotated in the casing 5 by the operation of the first driving means 34, and sludge contained in the cylindrical screen 32 is generated by the cylindrical screen 32. The fluid is separated from the sludge by the centrifugal force which is discharged to the outside of the screen (32).

In addition, the present invention has a compression dewatering unit 50 in the interior of the cylindrical screen 32, the compression dewatering unit 50 is disposed in the coaxial coaxially in the interior of the cylindrical screen 32 rotatable screw shaft (10) ) And second drive means (55) for rotating the screw shaft (10).

The screw shaft 10 is hollow, and the space therein forms a sludge inflow passage 92 which will be described later, and is disposed in an inclined state such as the casing 5 and the cylindrical screen 32. The sludge moves inside by its own weight.

In addition, the screw shaft 10 is mounted on the outer surface of the plurality of screw blades (10a), the screw blades (10a) has an outer diameter that corresponds to the inner diameter of the cylindrical screen 32, and thus the cylindrical screen ( Rotating inside 32 is configured to advance and compress the sludge located between the valleys of the screw vanes 10a inside the cylindrical screen 32.

And for this purpose the screw shaft 10 is mounted so that one end is rotatable through the bearing (B) with respect to the casing (5), the other end is a sleeve bearing (Ba) with respect to the cylindrical screen (32) It is mounted so as to be rotatable through, and the second driving means 55 is configured to receive the rotational force transmitted from the first driving means 34 and shift it to rotate the screw shaft 10.

Meanwhile, as shown in FIGS. 2 and 3, the second driving means 55 receives the rotational force transmitted from the first driving means 34 and shifts the screw shaft 10 so as to rotate the screw shaft 10. A belt 57 connected to the driven pulley 40 to which the cylindrical screen 32 is connected, an input shaft 60 connected to the belt 57, and an output shaft 62 coaxial with the screw shaft 10. One end pulley 64a of the intermediate shaft 64 includes a transmission 70 connected via a belt 66.

That is, the transmission 70 is connected to a driven pulley 40 to which the cylindrical screen 32 is connected through the belt 57 with its input shaft 60 mounted on a pulley 60a, and its output shaft 62. Is attached to the pulley 64a of the intermediate shaft 64 which will be described later through the belt 66. In addition, the transmission 70 has a shift handle 72 in the middle of the body so that when the user adjusts the shift handle 72, the stepless speed on the rotation speed transmitted from the input shaft 60 to the output shaft 62 It brings about shifting.

Therefore, the transmission 70 is a belt 57 to the driven pulley 40 when the driven pulley 40 is rotated by the operation of the motor, the first drive means 34, the cylindrical screen 32 is connected. The input shaft 60 connected through the rotation is rotated, which is shifted to a shape desired by the user through the shift handle 72, and then the output shaft 62 is rotated. In addition, as the output shaft 62 rotates, the intermediate shaft 64 connected through the belt 66 is rotated.

Such a power transmission system is described in FIGS. 2 and 3.

4, the other end of the intermediate shaft 64 is connected to the screw shaft 10 through the reducer 80 so that the second shaft 55 may have the cylindrical shape. It rotates at a different speed from the screen 32.

That is, the intermediate shaft 64 is connected to the output shaft 62 of the transmission 70 through the belt 66, and the rotation is performed, but the other end thereof is connected to the reducer 80 to the screw shaft 10 again. It transmits rotational force with another deceleration.

The reducer 80 has a driven pulley having a central sun gear 82 connected to the other end of the intermediate shaft 64 and connected to the cylindrical screen 32, as shown in detail in FIG. 5. 40 is connected to a ring gear 84 disposed outside of the sun gear 82, wherein the screw shaft 10 is between the sun gear 82 and the ring gear 84. It is connected to a number of rotating planetary gears (86).

The rotation from the intermediate shaft 64 is thus not transmitted directly to the screw shaft 10, but through the revolving of the planetary gears 86 disposed therebetween in interaction with the ring gear 84. Rotate). Since the speed reducer 80 rotates between the sun gear 82 and the ring gear 84 and the planetary gears 86 intervene therebetween, the revolution of the planetary gears 86 is reduced. Instead, the screw shaft 10 is rotated with a strong rotational torque.

As such, the screw shaft 10 through which the rotational force is transmitted through the transmission 70 and the reduction gear 80 of the second driving means 55 may be a cylindrical screen 32 rotated by the first driving means 34. Is rotated at different rotational speeds, and a differential rotation with a difference in rotational speed is made between the screw shaft 10 and the cylindrical screen 32.

Meanwhile, the centrifugal screw dehydrator 1 according to the present invention includes a sludge moving part 90 in which sludge moves in the casing 5, and the sludge moving part 90 is inside the screw shaft 10. A furnace sludge inflow passage 92 is formed, and a sludge dewatering passage 94 is provided between the screw shaft 10 and the cylindrical screen 32.

As shown in FIG. 1 and FIG. 2, the sludge inflow passage 92 and the sludge inflow passage 94 are changed from the sludge inflow passage 92 to the sludge dewatering passage 94. The conversion takes place through a plurality of holes 95 formed at the lower end of the screw shaft 10, ie at the end point of the sludge inflow passage 92 and at the front end of the sludge dewatering passage 94.

That is, the sludge proceeds through the sludge inflow passage 92 from the high point to the low point inside the screw shaft 10, and enters the sludge dewatering passage 94 through the plurality of holes 95, the rotating screw It is moved upwards in the cylindrical screen 32 by the screw vanes 10a of the shaft 10.

In addition, the sludge moving part 90 is a drainage passage 96 formed between the cylindrical screen 32 and the casing 5, and the sludge cake discharge passage formed between the screw shaft 10 and the casing 5 ( 98). The lower end of the drainage path (96) is formed through the casing (5) the sap discharge port 16 is formed, the lower side of the sludge cake discharge passage 98 through the casing (5) sludge cake outlet 14 is formed. That is, the sap outlet 16 is formed in the lower portion of the casing (5), the sludge cake outlet 14 is a structure formed in the high portion.

And the centrifugal screw dehydrator 1 according to the present invention further comprises a valve means 100 for opening and closing the sludge dewatering passage 94 on the outlet side of the sludge dewatering passage 94.

1 and 2, the valve means 100 is provided with a plurality of cylinders 102, the body of which is fixed to the upper end of the casing 5, the cylinder 102 is preferably It consists of a pneumatic cylinder and has a stopper ring 106 connected to the rod 104 of the cylinder 102 and capable of forward reversing.

Therefore, when the rods 104 are moved back and forth by the operation of the cylinder 102, the stopper ring 106 connected to the rod 104 is moved forward and backward to the sludge dehydration passage 94 to open and close it.

In addition, the stopper ring 106 is formed with a conical inclined surface 106a, which is inclined downward in the radial direction from the screw shaft 10, that is, the cylindrical screen 32 filter from the screw shaft 10. It is a structure that reduces the discharge resistance of the sludge moving from the sludge dewatering passage 94 to the sludge cake discharge passage 98 side by the structure inclined downward to the side.

In addition, the stopper ring 106 is configured to be linearly movable along the guide bar 112 by being slidably inserted into the plurality of guide bars 112 fixed to the casing 5. .

Reference numeral 120 is a control panel for realizing a series of automatic control in accordance with a predetermined program.

As shown in FIG. 2, the centrifugal screw dehydrator 1 according to the present invention configured as described above is introduced into the sludge inflow passage 92 through which sludge is formed into the screw shaft 10 through the sludge inlet 12. The cylindrical screen 32 is rotated by the first drive means 34, and the screw shaft 10 is rotated by the second drive means 55.

Therefore, the sludge introduced into the sludge inflow passage 92 is moved downward by the screw shaft 10 rotating in an inclined state, and through the plurality of holes 95 formed at the end point of the sludge inflow passage 92. Direction change is made to the sludge dewatering passage (94).

Then, the sludge introduced into the sludge dewatering passage 94 is subjected to a centrifugal force that is sludged by the high-speed rotation of the cylindrical screen 32 so that solids are attached to the inner wall of the cylindrical screen 32, and the sap separated from the sludge is The fluid outlet 16 formed in the lower portion of the casing 5 along the drainage path 96 formed between the cylindrical screen 32 and the casing 5 is discharged to the casing 5 side through the cylindrical screen 32. Is discharged through).

In addition, the sludge solid attached to the outer wall of the cylindrical screen 32 as described above is the screw shaft 10 by the screw blades 10a of the screw shaft 10 rotating at a different speed than the cylindrical screen 32. And along the sludge dewatering passage 94 formed between the cylindrical screen 32.

The sludge solids moving upward along the sludge dewatering passage 94 are maintained in a state where the valve means 100 provided at the outlet side of the sludge dewatering passage 94 keeps the sludge dewatering passage 94 closed or narrow. When the outlet is kept open, the sludge solids are compressed in the sludge dewatering passage 94.

Compression of the sludge solids by the rotation of the screw shaft 10 enables the sludge dewatering with a high water content of 40% or less, and in this process, the sap is additionally drawn out of the sludge solids and the cylindrical screen 32 and the casing. It is led to the sap discharge port 16 along the drainage path 96 formed between (5), and discharged.

The sludge solids from which the sap is additionally removed are converted into a sludge cake, which is further retracted by the cylinder rod 104 of the valve means 100 so that the sludge dewatering passage 94 is opened so that the sludge cakes have the valve means ( It is introduced into the sludge cake discharge passage 98 formed between the screw shaft 10 and the casing 5 from the rear of the 100, and is discharged to the outside through the sludge cake discharge port 14 located on the lower side. Such a series of processes are shown in Figures 1 and 2, the valve means 100 by the operator can adjust the degree of opening appropriately by effectively adjusting the degree of compression of the sludge by the screw shaft 10 Sludge dewatering operation can be obtained.

In the present invention, the first drive means 34 and the second drive means 55 for rotating the cylindrical screen 32 and the screw shaft 10 in the process of performing the sludge dewatering operation share a motor. The cylindrical screen 32 is disposed inside the casing 5, and the hollow screw shaft 10 is disposed inside the casing 5 to have a compact dehydrator structure. In addition, effective sludge dewatering can be achieved.

In the present invention, the sap is first removed from the sludge by the centrifugal force of the cylindrical screen 32 that rotates at a high speed, and then the sludge is dehydrated at a high pressure by using the compression force of the screw shaft 10. The sludge can be treated, as well as highly sludge dewatered with a water content of 40% or less.

In addition, since the present invention obtains a strong dehydration effect using centrifugal force and compression force, the centrifugal force of about 200G to 500G may be applied, so the power is about 1/2 to 2/3 as compared to the conventional centrifugal decanter. The energy alone can achieve effective sludge dewatering.

Although the present invention has been described in detail with reference to the accompanying drawings, the present invention is not limited to such a specific structure. Those skilled in the art may variously modify or change the embodiments of the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. Nevertheless, it will be apparent that all such modifications or design modifications to such simple embodiments will clearly fall within the scope of the present invention.

1 is a side cross-sectional view of the centrifugal screw dehydrator according to the present invention as a whole;

Figure 2 is a planar cross-sectional view of the centrifugal screw dehydrator according to the present invention as a whole;

Figure 3 is a side view showing the first drive means and the second drive means provided in the centrifugal screw dehydrator according to the present invention;

Figure 4 is a cross-sectional view showing in detail the structure of the reducer provided in the centrifugal screw dehydrator according to the present invention;

5 is a detailed view of the reducer provided in the centrifugal screw dehydrator according to the present invention.

       a) section showing turning sun gear, planetary gear, ring gear,

       b) is a side cross-sectional view.

<Description of Symbols for Major Parts of Drawings>

1 ..... centrifugal screw dehydrator according to the present invention

5 ..... Casing 7 ..... Pedestal

10 .... screw shaft 12 .... sludge inlet

14 .... sludge cake outlet 16 .... sap outlet

30 .... centrifugal dewatering part 32 .... cylindrical screen

34 .... First drive means 36 .... drive pulley

38 ... belt 40 ... driven pulley

50 .... compression dewatering part 55 .... second drive means

57 .... belt 60 .... input shaft

62 .... Output axis 64 .... Intermediate axis

66 .... Belt 70 .... Transmission

72 .... Shift Handle 80 .... Reducer

82 .... sun gear 84 .... ring gear

86 .... planetary gear 90 .... sludge moving parts

92 .... sludge inflow passage 94 .... sludge dewatering passage

95 .... hole 96 .... drainage

98 .... Sludge cake outlet 100 .... Valve means

102 ... cylinder 104 .... rod

106 ... Stopper ring 106a .... Slope

112 ... guide bar 114 .... hole

120 ... control panel

Claims (11)

In the dehydrator to separate the sap and solids from the sludge, Hollow casing; A centrifugal dewatering unit having a cylindrical screen rotatable inside the casing, and having one side having first driving means for rotating the screen; A compression dewatering portion having a screw shaft rotatably disposed coaxially within the cylindrical screen and having a second drive means for rotating the screw shaft; And A sludge inflow passage formed into the screw shaft, a sludge dewatering passage formed between the screw shaft and the cylindrical screen, a drainage channel formed between the cylindrical screen and the casing, and a sludge formed between the screw shaft and the casing And a sludge moving unit having a cake discharge passage, wherein the fluid and solids are separated from the sludge by centrifugal and compressive forces. The centrifugal screw dehydrator according to claim 1, wherein the casing is inclined on a pedestal, a sludge cake outlet is formed at a high end of the casing, and a fluid outlet is formed at a low end of the casing. 3. The centrifugal screw dehydrator according to claim 2, wherein the casing has a sludge inlet of the screw shaft disposed at the highest portion, and the sludge moves the sludge inflow passage by its own weight. The method of claim 1, wherein the centrifugal dewatering portion is mounted so that the cylindrical screen is rotatable through the bearing with respect to the casing, the first drive means is a motor, the drive pulley of the motor is connected to the belt, the belt is Centrifugal screw dehydrator, characterized in that the cylindrical screen is rotated by the operation of the first drive means is connected to the driven pulley provided at one end of the cylindrical screen. The method of claim 1, wherein the compression dewatering portion is mounted so that the screw shaft is rotatable with respect to the cylindrical screen through the sleeve bearing, the second drive means for rotating the screw shaft by changing the rotational force transmitted from the first drive means. Centrifugal screw dehydrator, characterized in that. The method of claim 5, wherein the second drive means is connected to the driven pulley of the cylindrical screen, the input shaft is connected to the belt and the output shaft is connected to one end of the intermediate shaft coaxial with the screw shaft through the belt And a transmission and the other end of the intermediate shaft are connected to the screw shaft through a reducer to rotate the screw shaft at a different speed than the cylindrical screen. 7. The speed reducer of claim 6, wherein the reducer is connected to a central sun gear connected to the intermediate shaft, the driven pulley of the cylindrical screen is connected to a ring gear, and the screw shaft is connected to a plurality of planetary gears from the intermediate shaft. Centrifugal screw dehydrator, characterized in that the deceleration is made toward. The centrifugal screw dehydrator of claim 1, wherein the sludge moving unit further includes valve means for opening and closing the sludge dewatering passage at an outlet side of the sludge dewatering passage. According to claim 8, The valve means has a plurality of cylinders fixed to the body on the upper end of the casing, the stopper ring is connected to the rod of the cylinder capable of forward and backward, the operation of the cylinder stopper ring is the sludge Centrifugal screw dehydrator, characterized in that for opening and closing the dehydration passage. The centrifugal screw dehydrator of claim 9, wherein the cylinder is formed of a pneumatic cylinder, and the stopper ring is formed with a conical inclined surface to reduce discharge resistance of the sludge. The centrifugal screw dehydrator according to claim 10, wherein the stopper ring is configured to be linearly movable by being slidably inserted into a plurality of guide bars fixed to the casing.

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