KR101829268B1 - Manufacture of synthetic fiber yarn spinning pack - Google Patents

Abstract

The present invention relates to a spinning pack for manufacturing a synthetic fiber yarn which can be disassembled and assembled quickly, simply, and safely even in a high temperature state.
A spinning pack for producing a synthetic fiber yarn according to the present invention comprises: a pack cover (100) for binding to an extruder through which a molten polymer is extruded; A pack case 200 rotatably coupled to the pack cover; A spinneret 300 coupled to the bottom of the pack case so as to be disassembled and assembled; A pressure plate 400 positioned on the spinneret; A fixing pin (500) for preventing any rotation of the spinneret coupled to the pack case; And a rotating means (600) for rotating the pack case rotatably coupled to the pack cover.
According to the present invention, the disassembly and assembly can be quickly and firmly performed by the pack case rotated by the rotating means and the fixing pin for fixing the pack case and the pack case to each other, The parts can be supported by the lift at the bottom of the spinning pack, and at the same time, the entire parts inside the spinning pack can be put into and discharged from the spinning pack using the lift, so that the spinning pack can be disassembled and assembled easily and safely even at high temperature Productivity can be expected to be improved.

Description

[0001] The present invention relates to a manufacturing method of a synthetic fiber yarn spinning pack,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a spinning pack for manufacturing synthetic fiber yarns, and more particularly, to a spinning pack for manufacturing synthetic fiber yarns that can be disassembled and assembled quickly, easily, and safely even at high temperatures.

Generally, synthetic fiber yarn is also called monofilament yarn. It is a fiber which can be continuously produced continuously without any joint or twist. It mainly melts a synthetic resin raw material by using an extruder, and then the molten polymer is mixed with a spinning pack ) To produce a synthetic fiber yarn.

6 is a perspective view of a typical case of the radiation pack 1 according to the first embodiment of the present invention. As shown in FIG. 6, a typical radiation pack 1 includes a pack case 2 having a cylindrical body whose upper and lower surfaces are opened, A pressure ring 6 having a plurality of polymer flow holes 5, a wire mesh filter 7, a ring-shaped filter material receiving spacer 8, a spacer 7 having a plurality of polymer holes 5, A packed cover 11 for holding a granular filtration material layer 9 accommodated in the inside of the packed bed 8 and a polymer introduction hole 10 through which the molten polymer flows into the center and closing the top face of the packed case 2, (12) formed between the inner surface of the granular filtration media (11) and the upper surface of the granular filtration media (9), and a second space (12) formed between the upper surface of the spinneret 2 spatial part 13 as shown in Fig.

At this time, the pack case, the spinneret, the pressure-bearing plate, the filter material receiving spacer and the pack cover are usually made of metal, and the particulate filter material layer is usually composed of a sand layer made of stainless steel particles, glass particles or quartz particles.

Therefore, the molten polymer as a raw material for producing synthetic fiber yarn is introduced into the first space portion from the polymer inflow hole at the center of the pack cover, passes through the granular filtration material layer and the mesh filter, passes through the polymer flow holes of the pressure- 2 space to reach a plurality of radiation holes of the spinneret.

The molten polymer introduced into the plurality of spinnerets passes through the spinneret and is cooled immediately after being discharged to form a plurality of filaments, that is, a synthetic fiber yarn.

On the other hand, since the diameter of the spinneret of the spinneret is usually 0.25 to 0.5 mm, the number of spinnerets formed in one spinneret ranges from several tens to several hundred, and therefore, If the polymer residue is left unused, the polymer residue will interfere with the molten polymer that is radiated through the radiation hole, causing the occurrence of truncation and scratching, resulting in product failure After using the spinneret for a certain period of time, it is necessary to perform the removal of the polymer residue generated in the spinneret.

In addition, disassembly and assembly of pack case and pack cover are essential for replacing consumable parts such as wire mesh filters, or for manufacturing synthetic fiber yarns of various diameters through the replacement of various spinnerets having different diameters.

However, in the pack case and the pack cover, a very rigid connection is inevitable in order to cope with the extrusion radiation pressure of the molten polymer.

Therefore, in order to disassemble and assemble the pack cover coupled to the pack case for the replacement or cleaning of the wire mesh filter or the spinneret, it is necessary to repeat the process of loosening and fastening all the bolt nuts radially coupled in a plan view There is a problem that a considerable working time is required.

Since not only the pack case constituting the above-mentioned radiation pack, but also the spinneret, the pressure-bearing plate, the filter material receiving spacer and the pack cover are made of metal, their weight is considerable. In the process of disassembling the pack case and the pack cover, There is no such a structure as to stably support the weight of the spinneret, the pressure-bearing plate, the filter housing receiving spacer, and the pack cover to be installed. Therefore, in the process of disassembling and assembling the spinning pack, There is a problem in that it is difficult to disassemble and assemble the radiating pack, and there is also a problem that an operator is often injured due to falling of heavy parts.

In addition, the spinning pack is heated to a high temperature by a band heater in order to spin the molten polymer. In the case where the spinning pack is decomposed due to defective spinning during the spinning operation of the synthetic fiber yarn, the spinning pack heated to a high temperature causes the operator's image It is necessary to wait until the spinning pack has sufficiently cooled down due to the high degree of relief. As a result, the working time is significantly delayed, thereby causing a problem of lowering the productivity.

In order to solve the problem of disassembling and assembling the conventional radiation pack, it is necessary to improve the coupling structure of the radiation pack. A typical prior art radiation pack having improved coupling structure will be described as follows.

As shown in FIG. 7, the radiating pack body 10 is connected to an outer cylinder 12 connected to one polymer flow path 16 and another polymer flow path 18, And the inner cylinder 14 located at the center of the first spinneret 12 and the sand cup 20, the perforated plate 22 and the distribution plate 24 and the spinneret 26 are both circular, 28 are fixed in the inner cylinder 14 and the sand cup 30, the perforated plate 32 and the distribution plate 34 and the nip 36 are both hollow, with the hollow 40, A pack 38 is fixed between the outer cylinders 14 and a female screw 42 is provided on the inner surface of the lower end of the inner cylinder 14 and a male screw 44 is provided on the outer circumferential surface, A first tightening ring 50 having a male screw portion 48 on the outer circumferential surface thereof and a second tightening ring 54 and a male screw portion 56 having an female screw portion 52 on the inner circumferential surface thereof, And a first spinning pack (28) and a second spinning pack (38) are fixed to the spinning pack body (10) with a third tightening ring (58) on the outer circumferential surface of the spinning pack have.

Registration Utility Model No. 20-0162866 (Dec. 15, 1999)

In the conventional art as described above, the fastening rings 50, 54 and 58 having the female thread portion formed at the lower portion of the spinning pack body 10 are disassembled and screwed to the female thread portion formed in the spinning pack body 10, The disassembling and assembling of the pack can be performed more quickly. However, in the prior art, the sand cup 30 installed in the inside of the spinning pack in the process of disassembling the spinning pack by loosening the tightening ring screwed to the female threaded portion of the spinning pack body The worker has to bear the weight of the stencil plate 32 and the distribution plate 34 and the detents 36 so that the work is not easy due to the weight of the components constituting the radiation pack, There is a disadvantage in that the disassembly and assembly of the radiation pack can not be performed due to the risk of burns of the operator.

Further, since the prior art is formed in the spinning pack body 10 and the tightening rings 50, 54 and 58 are screwed to the female threaded part, when the spinning pack is disassembled and assembled frequently, Various parts installed inside the body 10 are not firmly fixed, and when the abrasion of the thread portion is severe, leaking of the molten polymer occurs, resulting in waste of the raw material.

Therefore, in order to solve the problems of the related art as described above, in the disassembling and assembling process of the spinning pack, the load of the main parts installed in the spinning pack is not transferred to the operator, It is inevitable to develop a spinning pack for manufacturing a synthetic fiber yarn which enables easy disassembly and assembly of the spinning pack.

In order to overcome the above-described problems, the present invention provides a spinning pack for manufacturing a synthetic fiber yarn, which comprises a polymer inflow hole (101) through which a molten polymer supplied from an extruder flows, A pack cover 100 having a fixing hole 102 formed in a longitudinal direction and having an engagement groove portion 103 formed in a tooth shape on an outer circumferential surface thereof and coupled to the extruder;

And a coupling protrusion 201 is formed on an upper portion of the coupling protrusion 201 so as to be male and female corresponding to the coupling groove 103 so as to be rotatably coupled to the pack cover 100, (200) in which a battery pack (202) is formed;

And a plurality of latching pieces 302 corresponding to the support pieces 202 are radially formed on the outer circumferential surface so that the lower opening portion of the pack case 200 A spinneret 300 coupled to a lower portion of the pack case 200 so as to be cut off and having a fixing groove 303 corresponding to the fixing hole 102 formed at one side thereof;

Pressure plate 400 which forms a plurality of flow holes 401 through which the molten polymer is dispersed and has a detachable wire mesh filter 403 on its upper surface to be disassembled and assembled on the spinneret 300;

The fixing hole 102 of the pack cover 100 and the fixing groove 303 of the spinneret 300 prevent simultaneous rotation of the spinneret 300 coupled to the pack case 200 A fixing pin 500;

And a rotating means (600) for rotating the pack case (200) rotatably coupled to the pack cover (100).

A coupling groove 304 is formed on an upper surface of the spinneret 300 so that the lower end of the pressure plate 400 is seated in the coupling groove 304.

The rotating means 600 includes a coupling portion 203 protruding from one side of the pack case 200 and having a coupling hole 203a formed in the coupling portion 203 of the pack case 200, And a hydraulic cylinder 601 that engages the end of the rod 602 to enable the rotation of the pack case 200 by the stroke of the piston rod 602. [

The present invention provides a method of manufacturing a synthetic fiber yarn in which a yarn is wound around a yarn in a state where the yarn pack is heated to a high temperature It is possible to quickly and easily disassemble and assemble the radiation pack, thereby minimizing the radiation stop time due to the disassembly and assembly of the radiation pack, thereby improving the productivity. In addition, it is possible to prevent a safety accident The goal is to achieve.

INDUSTRIAL APPLICABILITY The spinning pack for manufacturing a synthetic fiber yarn of the present invention has the effect that the disassembly and assembling of the pack cover and the pack case are performed quickly and firmly by the rotation of the pack case rotated by the hydraulic cylinder and the fixing pin fixing the pack cover and the pack case .

In the process of disassembling and assembling the radiating pack, the main parts inside the radiating pack can be supported by the lift from the bottom of the radiating pack, and at the same time, the entire parts inside the radiating pack can be put into and discharged from the radiating pack by using the lift There is an advantage that the disassembling and assembling of the spinning pack is simple and safe.

In addition, in the disassembling and assembling process of the spinning pack, the operator can disassemble and assemble the spinning pack without directly contacting the spinning pack, so that the spinning pack can be disassembled and assembled as well as the spinneret can be replaced even when the spinning pack is heated to high temperature It is possible to minimize the radiation stop time due to the disassembly and assembly of the radiation pack and to improve the productivity, as well as to prevent the safety accident caused by the disassembly and assembly of the radiation pack.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of an embodiment of a spinning pack for making synthetic fiber yarn of the present invention.
2 is an exploded perspective view of a spinning pack for manufacturing a synthetic fiber yarn according to an embodiment of the present invention.
3 is a front cross-sectional view of an embodiment of a spinning pack for making a synthetic fiber yarn of the present invention.
4 is a plan view of an embodiment of a spinning pack for making a synthetic fiber yarn of the present invention.
5 is a front cross-sectional view showing a process of disassembling a spinning pack according to an embodiment of a spinning pack for manufacturing a synthetic fiber yarn of the present invention.
Figs. 6 and 7 are cross-sectional views illustrating a prior art related to a spinning pack for manufacturing synthetic fiber yarn. Fig.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the structure and operation of a spinning pack for manufacturing a synthetic fiber yarn according to a preferred embodiment of the present invention will be described in more detail with reference to the accompanying drawings.

The polymeric yarn for manufacturing a synthetic fiber yarn according to the present invention has a polymer inflow hole 101 into which a molten polymer fed from an extruder flows. The polymer inflow hole 101 is formed at a central portion in the longitudinal direction, a fixing hole 102 is formed at one side thereof in the longitudinal direction, A pack cover (100) for forming an engaging groove portion (103) formed in the extruder and connecting to the extruder;

A coupling protrusion 201 is formed at an upper portion of the coupling protrusion 201 so as to engage with the coupling recess 103 in a rotatable manner and a plurality of support pieces 202 are radially formed on the bottom surface of the coupling protrusion 201, A case 200;

And a plurality of latching pieces 302 corresponding to the support pieces 202 are radially formed on the outer circumferential surface so that the lower opening portion of the pack case 200 A spinneret 300 coupled to a lower portion of the pack case 200 so as to be cut off and having a fixing groove 303 corresponding to the fixing hole 102 formed at one side thereof;

Pressure plate 400 which forms a plurality of flow holes 401 through which the molten polymer is dispersed and has a detachable wire mesh filter 403 on its upper surface to be disassembled and assembled on the spinneret 300;

The fixing hole 102 of the pack cover 100 and the fixing groove 303 of the spinneret 300 prevent simultaneous rotation of the spinneret 300 coupled to the pack case 200 A fixing pin 500;

And a rotating means (600) for rotating the pack case (200) rotatably coupled to the pack cover (100).

The pack cover 100 has a polymer inflow hole 101 communicating with a molten polymer discharge port of the extruder so that molten polymer extruded from an extruder can be disassembled and assembled on the bottom surface of the extruder, As shown in Fig.

In this case, the diameter of the polymer inflow hole 101 is formed to be the same diameter from the upper end portion to the lower predetermined position, and is formed in the form of a funnel whose diameter increases from the lower predetermined position to the lower end portion. The diameter is preferably equal to the outer diameter of the pressure-resistant plate 400.

A number of fixing holes 102 are formed at one side of the pack cover 100 in the longitudinal direction. The number of the fixing holes 102 is at least two on the left and right sides, Forming a dog. It should be noted that the number of the fixing holes 102 is not limited and that the number of the fixing holes 102 can be increased or decreased according to the size of the pack cover 100.

Further, a coupling groove portion 103 having a tooth shape is formed on the outer peripheral surface of the pack cover 100.

The packing case 200 has a cylindrical body that penetrates vertically and has an upper portion formed with a coupling protrusion 201 having male and female engaging portions corresponding to the coupling recesses 103 to define a vertical center axis of the pack cover 100 To be rotatable about the center.

A plurality of support pieces 202 are radially formed on the bottom surface of the pack case 200.

That is, the support piece 202 is formed so as to protrude inward from the lower end of the inner circumferential surface of the pack case 200, and the diameter of the imaginary circle connecting the inner circumferential surfaces of the support pieces 202 is formed inside the pack case 200 The spinneret 300 is formed to be larger than the outer diameter of the spinneret 300 so that the spinneret 300 inserted into the spinneret 300 can be smoothly inserted into the packer case 200 from below the packer case 200, It is desirable to maintain a minimum clearance between the virtual circle and the outer diameter of the spinneret 300 so that the spinneret 300 is tightly coupled.

It is needless to say that the number of the support pieces 202 may be increased or decreased according to the size of the pack case 200.

The spinneret 300 forms a plurality of radiating holes 301 through which the molten polymer is extruded and radiated and a plurality of retaining pieces 302 corresponding to the support pieces 202 are radially formed on the outer circumferential surface of the spinneret 300, And is coupled to the lower portion of the pack case 200 so that the lower opening portion of the pack case 200 is blocked.

The diameter of the synthetic fiber yarn is determined according to the diameter of the radiation hole 301. The diameter of the synthetic fiber yarn 301 is determined according to the diameter of the radiation hole 301. [

Therefore, it is possible to manufacture a synthetic fiber yarn having a different diameter through the replacement of the spinneret 300 having the radiating holes 301 of various diameters.

The spinneret 300 may further include a female screw portion for screwing the pressure plate 400 in the center of the upper surface of the spinneret 300.

The pressure plate 400 can be assembled precisely and firmly on the upper surface of the spinneret 300 by providing a coupling groove 304 in which the pressure plate 400 is fitted on the upper surface of the spinneret 300 It is possible to prevent disassembly and disassembly of the pressure plate 400 located above the spinneret 300 during disassembly and assembly of the spinneret 300 from the pack case 200, The process can be performed more safely.

The hooking piece 302 protrudes outward from the outer circumferential surface of the spinneret 300. When the pack case 200 and the spinneret 300 are assembled, The size of the retaining piece 302 is smaller than the size of the support piece 202 formed in the pack case 200 so that the retaining piece 302 is seated on the support piece 202 of the pack case 200, It is preferable to form the engaging piece 302 smaller than the gap between the supporting pieces 202 so that the engaging piece 302 is inserted between the supporting pieces 202 of the pack case 200 in the process of assembling the detachment 300.

The upper and lower height or thickness of the latching piece 302 may be set to be equal to or smaller than the bottom surface of the pack cover 100 coupled to the inside of the upper portion of the pack case 200, A minimum clearance is formed between the bottom surface of the pack cover 100 and the upper surface of the support piece 202 so that the retaining piece 302 can be held in a tight fit state and maintain a tight and firm assembled state.

The number of the engaging pieces 302 is equal to the number of the supporting pieces 202 so that the diameter of the virtual circle connecting the outer circumferential surfaces of the engaging pieces 302 is smoothly inserted into the pack case 200 It is preferable to maintain the minimum clearance between the imaginary circle and the inner diameter of the pack case 200 so that the spinneret 300 is tightly coupled in the pack case 200 with the inner diameter smaller than the inner diameter of the pack case 200 Do.

A fixing groove 303 corresponding to the fixing hole 102 is formed on one side of the spinneret 300. That is, the fixing groove 303 is formed in the same number as that of the fixing hole 102 formed in the pack cover 100, and the depth of the fixing groove 303 is set to be the same as that of the spinneret 303, It is preferable that the thickness of the light guide plate 300 is not more than half of the total thickness.

The pressure-resistant plate 400 includes a plurality of flow holes 401 through which molten polymer is dispersed, and a detachable wire mesh filter 403 on the upper surface thereof.

As is well known, the diameter and the number of the flow holes 401 are not limited.

A network installation groove 402 having a vertical cross-sectional shape of an endowing so that the network filter 403 can be attached and detached is formed on the upper surface of the pressure-bearing plate 400, and a disk- And is installed inside the groove 402.

The outer diameter of the pressure-resistant plate 400 is larger than the outer diameter of the support piece 202 protruding inward from the inner surface of the pack case 200 so as to be able to be inserted into and discharged from the pack case 200 from the lower part of the pack case 200. Is formed to be smaller than the diameter of the imaginary circle connecting the inner circumferential surface, more preferably smaller than the inner diameter of the pack cover (100) so that the pressure plate (400) is inserted into the pack cover (100).

In order to improve airtightness between the inner circumferential surface of the pack cover 100 and the outer circumferential surface of the pressure plate 400 when the pressure plate 400 is inserted into the pack cover 100, And an installation groove for installing a packing or an O-ring for the O-ring.

The fixing pin 500 is inserted into the fixing hole 102 of the pack cover 100 and the fixing groove 303 of the spinneret 300 and is inserted into the spinneret 300 The lower end corner portion may be curved or chamfered so as to be easily inserted into the fixing hole 102 and the fixing groove 303.

The fixing pin 500 may be inserted into the fixing hole 102 and the fixing groove 303 at the same time and then may be provided with a ring or the like functioning as a handle .

The rotating means 600 may be any means capable of rotating the pack case 200 rotatably coupled to the pack cover 100.

For example, the rotating means 600 may include a coupling portion 203 having a coupling hole 203a formed on one side of the pack case 200 and a coupling portion 203 of the pack case 200 And a hydraulic cylinder 601 that engages the end of the piston rod 602 with the piston rod 602 to allow rotation of the pack case 200 by the stroke of the piston rod 602. [

The process of disassembling and assembling the synthetic fiber yarn for manufacturing synthetic fiber yarn to which the technique of the present invention has been applied will be described as follows.

First, the disassembly process of the spinning pack for manufacturing a synthetic fiber yarn according to the present invention will be described. First, the operation of the extruder is stopped, and the lift table 30 of the lift is brought into close contact with the bottom surface of the spinneret 300 4, the hydraulic cylinder 601 is actuated. By this stroke of the piston rod 602, as shown in FIG. 4, The pack case 200 rotatably coupled to the end of the piston rod 602 is rotated at a predetermined angle.

At this time, the supporting piece 202 radially formed in the lower part of the pack case 200 and the catching piece 302 formed radially below the spinneret 300 are separated from each other, The pack case 200 and the spinneret 300 are separated from each other while the retaining pieces 302 of the spinneret 300 are positioned in a space between the spinneret 300 and the spinneret 300.

5, when the pack case 200 and the spinneret 300 are separated from each other as described above, when the rack 30 is lowered, the spinneret 300 and the spinneret 300 are placed on the loading table. The pressure plate 400 coupled to the upper portion of the spinneret 300 is completely separated from the pack case 200 by being lowered by the loading table while being loaded on the loading table, It is possible to easily discharge the chain spinneret 300 and the pressure-resistant plate 400 from the pack case 200 by using a lift, thereby greatly improving convenience and safety of the spinning pack disassembly operation.

On the other hand, the assembling operation of the spinning pack proceeds in the reverse order of the above disassembling operation.

That is, in a state in which the spinneret 300 coupled to the upper portion of the pressure plate 400 to be mounted on the spinning pack is loaded on the loading table of the lift, the loading table is lifted using a lift, The pack case 200 is rotated using the hydraulic cylinder 601 while the pack case 200 is inserted into the pack case 200 through the lower part of the case 200 to couple the pack case 200 and the spinneret 300, When the fixing pin 500 is inserted into the fixing hole 102 so as to be simultaneously inserted into the fixing hole 102 formed in the housing 100 and the fixing groove 303 formed in the spinneret 300, The cover 100 and the spinneret 300 are fixed so that the spinneret 300 is prevented from rotating at an arbitrary speed, so that the spinneret can be assembled quickly and easily.

In addition, in the process of disassembling and assembling the spinning pack as described above, it is possible to eliminate the direct contact of the operator with the outside of the spinning pack, so that even when the spinning yarn heated to a high temperature is not completely cooled It is possible to quickly reprocess the radiator by minimizing the radiation stop time due to the disassembly and assembly of the radiation pack, thereby improving the productivity. In addition, in the process of disassembling and assembling the radiation pack, So that the disassembly and assembly of the radiation pack can be efficiently performed without the risk of a safety accident.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the invention as defined by the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

10: Spinning pack 20: Extruder
100: Pack cover 101: Polymer inflow hole
102: Fixing hole 103: Coupling groove
200: Pack case 201:
202: Support piece 203:
203a: Coupling ball 300: Spinning cage
301: air discharge hole 302:
303: fixing groove 400: pressure plate
401: Flowing hole 402: Network installation groove
403: Wire mesh filter 500: Fixing pin
600: rotating means 601: hydraulic cylinder

Claims (3)

A polymer inlet hole 101 into which a molten polymer supplied from an extruder flows is formed in a longitudinal direction at a central portion thereof, a fixing hole 102 is formed in a longitudinal direction at one side thereof, and a coupling groove portion 103 formed in a tooth- A pack cover (100) for coupling to the extruder;
And a coupling protrusion 201 is formed on an upper portion of the coupling protrusion 201 so as to be male and female corresponding to the coupling groove 103 so as to be rotatably coupled to the pack cover 100, (200) in which a battery pack (202) is formed;
And a plurality of latching pieces 302 corresponding to the support pieces 202 are radially formed on the outer circumferential surface so that the lower opening portion of the pack case 200 A spinneret 300 coupled to a lower portion of the pack case 200 so as to be cut off and having a fixing groove 303 corresponding to the fixing hole 102 formed at one side thereof;
Pressure plate 400 which forms a plurality of flow holes 401 through which the molten polymer is dispersed and has a detachable wire mesh filter 403 on its upper surface to be disassembled and assembled on the spinneret 300;
The fixing hole 102 of the pack cover 100 and the fixing groove 303 of the spinneret 300 prevent simultaneous rotation of the spinneret 300 coupled to the pack case 200 A fixing pin 500;
And a rotating means (600) for rotating the pack case (200) rotatably coupled to the pack cover (100).
The method of claim 1, further comprising:
Wherein a coupling groove (304) is formed on an upper surface of the spinneret (300) so that a lower end of the pressure plate (400) is seated in the coupling groove (304).
The method of claim 1, further comprising:
The rotating means 600 includes a coupling portion 203 protruding from one side of the pack case 200 and having a coupling hole 203a formed in the coupling portion 203 of the pack case 200, And a hydraulic cylinder (601) which engages an end of the rod (602) to enable rotation of the pack case (200) by the stroke of the piston rod (602).

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