CN114055664A

CN114055664A - Screw type dewatering extruder

Info

Publication number: CN114055664A
Application number: CN202110788446.5A
Authority: CN
Inventors: 罗炳烈
Original assignee: Xincheng Technology Co ltd
Current assignee: Xincheng Technology Co ltd
Priority date: 2020-07-31
Filing date: 2021-07-13
Publication date: 2022-02-18
Also published as: KR102218471B1

Abstract

The present invention discloses a screw type dehydration extruder, which is simultaneously suitable for a screw dehydration mode and an extrusion mode, and is provided with a material supply area, a first stage dehydration area and a second stage dehydration area based on compression, a third stage dehydration area based on vacuum and a high pressure extrusion area as a whole, and a particle forming unit is rotatably arranged at the rear side of a cylinder body, thereby not only greatly improving the dehydration capability, but also greatly reducing the equipment and the cost for inputting a rear end drying procedure without additionally arranging an extruder at the rear end like the existing dehydration device, and easily and rapidly producing particles with the cut size from materials after the dehydration and extrusion processes. Further, when the lead screw rotates in the forward direction, the powder moves from the front side to the rear side of the cylinder, and at this time, the reverse screw type blade exerts an effect of preventing the powder from moving, and finally, the powder dehydration effect is further improved. The cooling air injection unit injects cooling air to the powder extruded through the die holes to rapidly granulate the powder, thereby enabling mass production.

Description

Screw type dewatering extruder

Technical Field

The present invention discloses a screw type dehydration extruder, more specifically, the screw type dehydration extruder is simultaneously suitable for screw dehydration mode and extrusion mode and is integrally equipped with a feeding (feeding) zone, a first stage dehydration zone and a second stage dehydration zone based on compression, a third stage dehydration zone based on vacuum and a high pressure extrusion zone, and is also equipped with a particle forming unit rotatably at the rear side of a cylinder body, which can rapidly produce particles with proper size in batches from powder subjected to dehydration and extrusion processes.

Background

In the production process of a thermoplastic resin polymer, a crushed product (resin material) of a waste recycling process of a resin material or a plastic product thereof usually contains a large amount of moisture, and therefore, a dehydration process for removing the contained moisture is required at the end of each production process of the polymer.

For example, in a conventional dehydration step, a method such as a fluidized drying furnace is used in a process for producing an ABS (acrylonitrile-butadiene-styrene) resin.

However, the ABS latex produced by the fluidized polymerization is coagulated and washed with water to form a slurry containing a large amount of water, and the slurry is dehydrated by supplying the slurry to a centrifugal dehydrator to form a water-containing powder or wet cake having a water content of about 30 to 40%.

The water-containing powder is dried by heat energy until the water content reaches about 1% by using a drying tube, a fluidized drying furnace or the like in order to prevent compounding by an extruder in the final step, a vent up in the pellet production process, or a foaming phenomenon.

The resin material having a water content of about 1% is supplied to a uniaxial or biaxial screw extruder, finally subjected to a drying process, and then compounded to prepare pellets.

Generally, an Extruder (Extruder) feeds a resin material into a hopper (hopper) provided in a cylinder (cylinder) and supplies (feeds) the resin material in a forward direction, that is, to a cross-head side by means of a rotating screw (screw) and receives heat from the cylinder so that the resin material is heated, kneaded and melted, and the resin material in a fluidized state is made into a product having a certain shape after passing through a die (dies), and is solidified, and the product is continuously produced in a longitudinal direction by means of a tension capstan (tensioning capstan).

However, the conventional dehydration apparatus requires an additional extruder at the rear end, which increases the equipment and cost required for the rear-end drying process, and cannot granulate the material subjected to dehydration and extrusion.

[ Prior art documents ]

[ patent document ]

(patent document 1) Korea publication No. 1998-0008506

(patent document 2) Korean registered patent No. 10-1901571

Disclosure of Invention

[ technical problem ] to be solved

The present invention has been made to solve the above problems, and an object of the present invention is to provide a dehydration type screw extruder which is capable of rapidly mass-producing a powder subjected to dehydration and extrusion processes into particles of an appropriate size by integrally disposing a feeding zone, a first stage dehydration zone and a second stage dehydration zone based on compression, a third stage dehydration zone based on vacuum, and a high-pressure extrusion zone, and by rotatably disposing a particle forming unit on the rear side of a cylinder body, while simultaneously employing a screw dehydration method and an extrusion method.

The technical problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems not mentioned above can be clearly understood by those skilled in the art to which the present invention pertains from the following description.

[ technical means for solving problems ]

In order to achieve the above object, a screw type dewatering extruder according to the present invention includes: a cylinder body having a supply unit for inputting powder containing moisture mounted at one side thereof and a discharge unit for discharging the powder mounted at the other side thereof; a lead screw rotatably installed inside the cylinder, compressing and dehydrating the powder charged through the supply unit, and extruding the dehydrated powder through the discharge unit; a lead screw driving unit for driving the lead screw to rotate; and a granule forming unit provided at the other side of the cylinder to cool and granulate the powder extruded by the discharging unit.

The cylinder body is provided with a feeding area, a first stage dehydration area based on compression, a second stage dehydration area, a third stage dehydration area based on vacuum and a high-pressure extrusion area.

Heaters (heater) may be installed in the first and second stage dewatering zones.

The outer peripheral surface of the lead screw can be formed with forward spiral blades, and the middle of the forward spiral blades can be formed with reverse spiral blades.

The particle forming unit comprises: a cooling air injection unit injecting cooling air to the powder extruded through the die hole of the discharge unit; the particle forming machine frame is rotatably arranged on the other side of the cylinder body; the cutter shaft is rotatably arranged on the particle forming rack and can be arranged in a forward and backward mode; a cutter shaft driving motor for driving the cutter shaft; a cutter formed on an outer circumferential surface of the cutter shaft to cut the powder cooled by the cooling air injected by the cooling air injection unit into a certain size; and a distance adjusting unit installed at a rear end portion of the cutter shaft so as to adjust a distance between the die hole and the cutter.

Also, when the cutter shaft rotates, the cutter rotates and cuts the powder, which is cooled by the cooling air injected from the cooling air injection unit, into a certain size.

And, the interval adjusting unit is provided with an adjusting bracket installed at the rear end of the cutter shaft, and a handle connected to the adjusting bracket.

Further, a bearing housing fixing frame may be attached to an outer periphery of the cutter shaft, and a bearing may be attached to an inside of the bearing housing fixing frame.

Further, in order to transmit the power of the cutter shaft driving motor, a synchronizing wheel is attached to the cutter shaft, and a belt is connected between the synchronizing wheel and a driving pulley of the cutter shaft driving motor.

[ PROBLEMS ] the present invention

According to the present invention, a feeding zone, a first stage dehydration zone and a second stage dehydration zone by compression, a third stage dehydration zone by vacuum, and a high pressure extrusion zone are integrally provided by applying a screw method and an extrusion method, and a pellet forming unit is rotatably provided at the rear side of a cylinder body, so that not only can the dehydration capability be greatly improved, but also the equipment and cost for putting into the rear end drying process can be greatly reduced without additionally providing an extruder at the rear end like the conventional dehydration apparatus, and pellets having cut sizes can be rapidly mass-produced from the material subjected to the dehydration and extrusion processes.

Further, when the lead screw is rotated in the forward direction, the powder (powder) is supplied (feeding) from the front side of the cylinder to the rear side, and the reverse screw type blade exerts an effect of preventing the movement of the powder, and as a result, the dehydration effect of the powder can be further improved.

Further, the powder extruded through the die holes (die holes) of the die plate is sprayed with cooling air at the cooling air spraying unit to rapidly granulate the powder, thereby mass-producing the powder.

The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned above can be clearly understood by those skilled in the art from the description of the claims.

Drawings

Fig. 1 is a front view showing a screw type dewatering extruder according to the present invention.

FIG. 2 is a top view of a screw dewatering extruder according to the present invention showing the combination of cylinders with a pellet forming stand.

FIG. 3 is a top view of a screw dewatering extruder according to the present invention showing the separation of the cylinders from the pellet forming stand.

Fig. 4 is a right side view showing a screw type dewatering extruder according to the present invention.

Fig. 5 is an enlarged view illustrating the particle forming unit shown in fig. 1.

Fig. 6 is an enlarged view of a portion a shown in fig. 1.

Description of reference numerals:

1: screw type dewatering extruder 2: base frame

10: the cylinder body 11: supply unit

15: discharge unit 15 a: die hole

20: the lead screw 21: forward spiral blade

23: reverse spiral blade 23 a: discontinuous portion

30: the lead screw drive unit 31: gear box

32: high-speed coupling 33: protecting cover

34: low-speed coupling 35: protecting cover

100: particle forming unit 110: cooling air injection unit

120: particle forming machine frame 121: hinge assembly

130: cutter shaft 131: synchronizing wheel

135: belt 140: cutter shaft driving motor

150: the cutter 160: spacing adjustment unit

161: the adjusting bracket 165: handle bar

170: bearing-holder fixing frame 171: bearing assembly

Z1: feeding area

Z2, Z3: compression-based first stage dewatering zone, second stage dewatering zone

Z4: vacuum based third stage dewatering zone

Z5: high pressure extrusion zone

H: heating device

Detailed Description

In order that those skilled in the art can easily realize the present invention, a preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

In describing the present embodiment, a description of technical contents that are widely known in the technical fields to which the present invention pertains and that are not directly related to the present invention will be omitted. This is for the purpose of omitting unnecessary descriptions so as not to obscure the gist of the present invention.

For the same reason, some elements in the drawings may be enlarged or roughly illustrated or omitted.

Moreover, the dimensions of the various elements do not fully reflect their actual dimensions. The same or corresponding elements in each figure are represented by the same figure symbols.

Furthermore, expressions and terms used in the present invention with respect to terms such as device or element orientation (e.g., "front", "back", "up", "down", "top", "bottom", "left", "right", "horizontal") are used only for the sake of simplicity and clarity in describing the present invention, and do not indicate or imply that the related device or element must have a specific orientation.

For reference, in a resin process performed in a conventional petrochemical process, a water-containing powder is dehydrated in a first stage centrifugal dehydrator and then dehydrated again in a screw dehydrating apparatus, and then the coagulated powder is pulverized by a pin mill and dried by a Fluidized Bed Dryer (FBD) to produce a dried powder, the screw dehydrating extruder of the present embodiment is adapted to a screw dehydrating method and an extruding method at the same time, and a feeding zone, a first stage dehydrating zone and a second stage dehydrating zone by compression, a third stage dehydrating zone by vacuum, and a high pressure extruding zone are integrally arranged, so that not only can a dehydrating capability be greatly improved, but also an additional extruder does not need to be arranged at a rear end as in the conventional dehydrating apparatus, thereby greatly reducing equipment and costs for putting into a rear end drying process, and a pellet forming unit (a cooling unit and a pellet forming unit) is arranged at a rear side of a cylinder body in a separable structure (for example, a rotatable structure) A cutting unit) so that the material subjected to the dehydration and extrusion processes can be rapidly mass-produced into pellets having the cut size.

The present invention will be described in detail below by way of examples of the present invention in conjunction with the accompanying drawings for illustrating a screw type dewatering extruder.

Fig. 1 is a front view showing a screw type dewatering extruder according to the present invention, and fig. 2 is a plan view of the screw type dewatering extruder according to the present invention, showing a combination of a cylinder and a pellet forming frame. Fig. 3 is a plan view of a screw type dewatering extruder according to the present invention, showing separation of a cylinder from a pellet forming frame, fig. 4 is a right side view showing the screw type dewatering extruder according to the present invention, fig. 5 is an enlarged view showing a pellet forming unit shown in fig. 1, and fig. 6 is an enlarged view of a portion a shown in fig. 1.

As shown in the foregoing figures, a screw type dewatering extruder 1 according to the present invention comprises: a cylinder 10 mounted at one side with a supply unit 11 for inputting powder (powder) containing moisture and mounted at the other side with a discharge unit 15 for discharging the powder; a lead screw 20 rotatably installed inside the cylinder 10, compressing and dehydrating the powder charged through the supply unit 11, and extruding the dehydrated powder through the discharge unit 15; a lead screw driving unit 30 for driving the lead screw 20 to rotate; and a granule forming unit 100 disposed at the other side of the cylinder 10 to cool and granulate the powder extruded through the discharging unit 15.

To describe the structure of the screw type dewatering extruder 1 according to the present invention more specifically, first, the lead screw driving unit 30 may be attached to the front side (head end) of the cylinder 10 and the pellet forming unit 100 may be disposed on the rear side of the cylinder 10.

The lead screw driving unit 30 for driving the lead screw 20 to rotate is connected to the gear box 31 through the high speed coupling 32, and a protective cover 33 may be installed outside the high speed coupling 32.

The gear case 31 may be connectively mounted to the lead screw 20 via a low speed coupling 34, and a cover 35 may be mounted to the outside of the low speed coupling 34.

The protection covers 33, 35 are installed to effectively prevent safety accidents of the worker.

The base frame 2 is a supporting structure for supporting the screw dewatering extruder 1, a cylinder 10 is mounted on the base frame 2, and the lead screw 20 is rotatably mounted inside the cylinder 10. The lead screw 20 is rotated by the power of the lead screw driving unit 30, and a control unit (not shown) controls the rotation speed, the rotation time, and the like of the lead screw 20.

Further, the cylinder 10 includes a feed zone Z1, a compression-based first stage dewatering zone Z2 and a second stage dewatering zone Z3, a vacuum-based third stage dewatering zone Z4, and a high pressure extrusion zone Z5.

One of the technical features of this embodiment is that the feed zone Z1, the compression-based first stage dewatering zone Z2 and second stage dewatering zone Z3, the vacuum-based third stage dewatering zone Z4 and the high pressure extrusion zone Z5 are integrally constructed.

That is, although the conventional dehydration apparatus requires an additional extruder at the rear end and increases the equipment and cost required for the rear-end drying process, in the present embodiment, the feed zone Z1, the first stage dehydration zone Z2 and the second stage dehydration zone Z3 by compression, the third stage dehydration zone Z4 by vacuum, and the high-pressure extrusion zone Z5 are integrally configured, and thus the problems of the conventional dehydration apparatus can be solved.

In the first stage dehydrating zone Z2 of this embodiment, a heater H may be installed inside the cylinder 10, and the heater H functions to heat the powder (powder) containing moisture to accelerate the dehydrating function.

A forward screw type blade 21 is formed on an outer circumferential surface of the lead screw 20, and a reverse screw type blade 23 is formed in a middle of the forward screw type blade 21.

When the lead screw 20 is rotated in the forward direction, the powder (powder) moves in the backward direction in the front side of the cylinder 10, and at this time, the reverse screw type blade 23 acts to prevent the powder from moving, and as a result, the dehydration effect of the powder can be further improved.

In this embodiment, the number of the reverse screw type blades 23 may be set to one or more according to design conditions, which is different from the forward screw type blades 21, and the reverse screw type blades 23 are formed in a discontinuous structure, and the dehydrated powder is moved from the front side to the rear side of the cylinder 10 through the discontinuous portion 23 a.

Here, the forward direction of the lead screw 20 refers to a direction in which the powder is moved from the front side to the rear side of the cylinder 10, and the reverse direction refers to the opposite direction.

Further, the particle forming unit 100 is rotatably installed at the rear side of the cylinder 10 centering on the hinge 121, and the particle forming frame 120 is rotatably coupled to or separated from the cylinder 10 centering on the hinge 121, so that it is very convenient to use and easy to maintain and repair.

As an example of the structure in which the particle forming unit 100 is separated from the rear side of the cylinder 10, the present embodiment has described only the structure of rotation, but the present invention is not limited thereto, and as another example, a structure such as a slide structure can be cited.

The particle forming unit 100 includes: a cooling air injection unit 110 for injecting cooling air to the powder extruded through the orifice 15a of the discharge unit (orifice plate) 15; a particle forming frame 120 rotatably installed at the other side of the cylinder 10; a cutter shaft 130 rotatably mounted on the particle molding frame 120 to be movable forward and backward; a cutter shaft driving motor 140 for driving the cutter shaft 130; a cutter 150 formed on an outer circumferential surface of the cutter shaft 130 to cut the powder cooled by the cooling air injected from the cooling air injection unit 110 into a certain size; and a spacing adjustment unit 160 installed at a rear end portion of the cutter shaft 130 so as to adjust a spacing between the die hole 15a and the cutter 150.

That is, the discharging unit 15 refers to a die plate, and the discharging unit 15 is formed with a die hole 15 a. The dehydrated powder is discharged (or extruded) in a compressed state through the die hole 15 a.

The cooling air injection unit 110 injects cooling air to the dehydrated powder through the die hole 15a to solidify the powder, and when the cutter shaft driving motor 140 rotates the cutter shaft 130, the cutter 150 rotates, and the solidified powder is cooled and solidified by the cooling air injected from the cooling air injection unit 110, and is cut into a predetermined size to perform particle molding.

The cooling air injection unit 110 may be installed at one side of the discharge unit 15 to inject cooling air to the powder compressed through the die hole 15a, and the nozzle 111 of the cooling air injection unit 110 is configured to communicate with the die hole 15 a.

The interval adjusting unit 160 is provided with an adjusting bracket 161 installed at the rear end of the cutter shaft 130, and a handle 165 connected to the adjusting bracket 161.

The adjustment holder 161 is moved forward and backward by rotating the knob 165 forward and backward so that the cutter shaft 130 is also moved forward and backward, thereby adjusting the distance between the die hole 15a and the cutter 150.

Here, the forward direction of the handle 165 refers to a forward direction of the handle 165, and the reverse direction refers to a backward direction of the handle 165.

A bearing-seat fixing frame 170 is attached to the outer periphery of the cutter shaft 130, and a bearing 171 is attached to the inside of the bearing-seat fixing frame 170. The bearing 171 enables the cutter shaft 130 to rotate along the field.

Further, a synchronizing wheel 131 is mounted on the cutter shaft 130 to transmit power of the cutter shaft driving motor 140, and a belt 135 may be connected between the synchronizing wheel 131 and a driving pulley 141 of the lead screw driving unit 30.

That is, the power of the cutter shaft driving motor 140 is transmitted to the cutter shaft 130 via the belt 135 connecting the timing pulley 131 and the driving pulley 141, and the cutter shaft 130 is rotated.

The operation of the screw type dewatering extruder of the present invention configured as described above will be described in detail with reference to fig. 1 to 6.

First, after powder containing moisture (hydrous powder) is put into the supply unit 11, the lead screw drive unit 30 drives the lead screw 20 to rotate in the forward direction. The lead screw 20 compresses and dehydrates the water-containing powder charged through the supply unit 11, and extrudes the dehydrated powder through the die hole 15a of the discharge unit 15.

When the lead screw 20 is rotated in the forward direction, the powder (powder) moves (feeding) in the backward direction from the front side of the cylinder 10, and at this time, the reverse screw type blade 23 exerts an effect of preventing the powder from moving, so that the powder compression effect is maximized, and as a result, the dehydration effect of the powder can be further improved.

The pellet forming unit 100 cools and granulates the powder extruded through the discharging unit 15.

The operation of the pellet forming unit 100 is described below. The cooling air injection unit 110 injects cooling air to the powder extruded through the orifice 15a of the discharge unit (orifice plate) 15. At this time, the powder is rapidly cooled and solidified. The cutter shaft driving motor 140 rotates the cutter shaft 130.

The cutter 150 cuts the powder cooled by the cooling air injected from the cooling air injection unit 110 into a certain size to be granulated. The size of the particles can be adjusted by controlling the rotation speed of the cutter shaft 130.

That is, the faster the rotation speed of the cutter shaft 130, the smaller the particle size, and conversely, the slower the rotation speed of the cutter shaft 130, the larger the particle size. Further, the discharge of the powder can be rapidly induced by adjusting the distance between the die hole 15a and the cutting knife 150 using the distance adjusting unit 160.

As described above, according to the present invention, the feeding zone, the first stage and second stage dehydration zones by compression, the third stage dehydration zone by vacuum, and the high pressure extrusion zone are integrally provided while the screw dehydration method and the extrusion method are applied, and the pellet forming unit is rotatably provided at the rear side of the cylinder body, so that not only can the dehydration ability be greatly improved, but also the equipment and cost for inputting the rear end drying process can be greatly reduced without providing a separate extruder at the rear end as in the conventional dehydration apparatus, and the pellets having the cut size can be easily and rapidly produced from the material subjected to the dehydration and extrusion processes.

Further, when the lead screw rotates in the forward direction, the powder (powder) moves in the backward direction from the front side of the cylinder, and at this time, the reverse screw type blade exerts an effect of preventing the powder from moving, and finally, the dehydration effect of the powder can be further improved.

Also, the cooling air injection unit injects cooling air to the powder extruded through the die hole (die hole) to rapidly granulate the powder, thereby enabling mass production.

On the other hand, the specification and the drawings disclose preferred embodiments of the present invention, and although specific terms are used, they are used in a general sense only for the purpose of simplicity of explanation and understanding of the technical contents of the present invention, and do not limit the scope of the present invention. In addition to the embodiments disclosed herein, other modifications based on the technical spirit of the present invention can be implemented as would be apparent to one skilled in the art to which the present invention pertains.

The screw dewatering extruder according to the present invention can be variously deformed and can take various forms. It should be understood, however, that the invention is not limited to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

Claims

1. A screw type dewatering extruder, which is characterized in that,

the method comprises the following steps:

a cylinder (10) having a supply unit (11) for inputting powder containing moisture installed at one side and a discharge unit (15) for discharging the powder installed at the other side, and integrally provided with a supply zone (Z1), a first stage dehydration zone (Z2) and a second stage dehydration zone (Z3) based on compression, a third stage dehydration zone (Z4) based on vacuum, and a high pressure extrusion zone (Z5);

a lead screw (20) rotatably installed inside the cylinder (10), compressing and dehydrating the powder charged through the supply unit (11), extruding the dehydrated powder through the discharge unit (15), forming a forward screw blade (21) on an outer circumferential surface thereof, forming a reverse screw blade (23) in the middle of the forward screw blade (21), the reverse screw blade (23) being formed in a discontinuous structure and moving the dehydrated powder through a discontinuous portion (23 a);

a lead screw drive unit (30) for driving the lead screw (20) to rotate; and

and a pellet forming unit (100) provided with a pellet forming frame (120) and a cooling air injection unit (110), wherein the pellet forming frame (120) can be rotatably installed by taking a hinge (121) arranged at one side of the cylinder body (10) as a center and can be combined to the cylinder body (10) or be separated from the cylinder body, and the cooling air injection unit (110) is installed at one side of the discharge unit (15) in a mode that a nozzle (111) is communicated with the die hole (15a) in order to solidify powder injection cooling air extruded through the die hole (15a) of the discharge unit (15).

2. The screw dewatering extruder of claim 1,

a heater (H) is installed in the first stage dewatering zone (Z2).

3. The screw dewatering extruder of claim 1,

the particle forming unit (100) comprises:

a cutter shaft (130) rotatably mounted on the particle forming machine frame (120) and capable of moving forward and backward;

a cutter shaft driving motor (140) for driving the cutter shaft (130);

a cutter (150) formed on an outer circumferential surface of the cutter shaft (130) to cut the powder cooled by the cooling air injected from the cooling air injection unit (110) to a certain size; and

a spacing adjustment unit (160) mounted at a rear end portion of the cutter shaft (130) so as to adjust a spacing between the die hole (15a) and the cutter (150).

4. The screw dewatering extruder of claim 3,

when the cutter shaft (130) rotates, the cutter (150) rotates and cuts the powder, which is cooled by the cooling air injected from the cooling air injection unit (110), into a certain size.

5. The screw dewatering extruder of claim 3,

the interval adjusting unit (160) is provided with an adjusting frame (161) arranged at the rear end of the cutter shaft (130) and a handle (165) connected to the adjusting frame (161).

6. The screw dewatering extruder of claim 3,

and a fixing frame (170) for a bearing seat is arranged on the periphery of the cutter shaft (130), and a bearing (171) is arranged in the fixing frame (170) for the bearing seat.

7. The screw dewatering extruder of claim 3,

in order to transmit the power of the cutter shaft driving motor (140), a synchronizing wheel (131) is installed on the cutter shaft (130), and a belt (135) is connected between the synchronizing wheel (131) and a driving pulley (141) of the cutter shaft driving motor (140).