KR101685080B1 - System For Vertical Elongating, Part Thickness Prevention, and Air Tightness Maintenance Of PET Preform - Google Patents

Abstract

The present invention relates to a system for vertically elongation, irregular thickness prevention, and air tightness maintenance of pet preform. The system comprises: a vertical support integrated with a horizontal support on the ground; a servo motor installed on a front surface of the vertical support; a pinion installed on one side of a rotary shaft of the servo motor, and disposed on a rear side of the vertical support; a rack gear having teeth provided on one side thereof, and vertically moving by the teeth engaging with teeth of the pinion; a plate protruding toward the vertical support, having two or more protruding portions disposed at an interval, and horizontally attached to one side of a lower end of the rack gear; two or more LM guides each having a guide rail and a bearing, and installed on the rear side of the vertical support to be coupled to the two or more protruding portions, respectively, guiding the vertical movement of the plate; a plurality of stretch rods vertically installed on a lower side of the plate; an air inlet and outlet portions installed around a portion of the stretch rods, and having an air inlet, an air outlet, and an air sealing portion; a blow nozzle injecting air to the air inlet and outlet portions such that the air is injected into the pet preform through the air inlet and outlet portions to expand the pet preform in a circumferential direction thereof; and a guide block fixed on an upper surface of the vertical support, spaced apart from the rack gear at an interval, and guiding the vertical movement of the rack gear while preventing the rack gear from slanting toward the vertical support below the rack gear.

Description

(Vertical Elongating, Part Thickness Prevention, and Air Tightness Maintenance of PET Preform)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical stretching of a pet preform, prevention of curling, and a hermetic maintaining system. More particularly, the present invention relates to a vertical preform, A servo motor provided on the front side of the vertical stand; A pinion disposed on one side of a rotary shaft of the servomotor and disposed on a rear side of the vertical base; A rack gear having teeth on one side thereof and vertically moving vertically with the teeth of the pinion meshing with the teeth; A plate horizontally attached to one side of the lower end of the rack gear, the plate having two or more protrusions projecting toward the vertical band and spaced apart from each other; Two or more LM guides, which include a guide rail and a bearing, and are provided on a back surface side of the vertical stand and are respectively engaged with the two or more protrusions to guide up and down vertical movement of the plate; A plurality of stretch rods vertically installed on the lower side of the plate; An air inflow / outflow portion provided around a part of the stretch rod and having an air inlet, an air outlet, and an air sealing portion; A blow nozzle injecting air into the pet preform through the air inflow / outflow portion to inject air into the air inflow / outflow portion so that the pet preform is expanded in a circumferential direction of the pet preform; And a guide block fixed to the upper surface of the vertical stand and spaced from the rack gear so as to prevent inclination of the lower portion of the rack gear toward the vertical stand and to guide up and down vertical movement of the rack gear The present invention relates to a vertical stretching of a pet preform, prevention of curling, and a confidential maintenance system.

Hereinafter, the background art will be described with reference to the accompanying drawings.

Generally, a process of manufacturing a pet preform by a vertically stretched blowing system of a pet preform includes a step of grasping a pet preform gripped by a preform preform (PET preform) preliminarily formed at a stage prior to the production of a pet bottle In the pet preform, heat is absorbed, air is injected into the pet preform, the stretch rod vertically installed on the lower side of the plate horizontally attached to the lower end of the rack gear enters the pet preform through the neck of the pet preform, And a step of stretching the pet preform by pushing the preform bottom.

6 is a cross-sectional view of one side of a vertical drawing blow system of a conventional pet preform.

Referring to FIG. 6, the conventional vertically extending blow system of the pet preform for the stretching process comprises a vertical bar 20 integrally formed with a horizontal bar 50 on the ground; A servomotor 40 installed on the vertical stand; A pinion 70 installed on one side of the rotary shaft of the servo motor 40; A rack gear (10) having teeth (10-1) at one side and the teeth of the pinion (70) and the teeth (10-1) engaged with each other and moving vertically; An LM guide (80) including a guide rail and a bearing and installed on the vertical base (20) and guiding vertical movement of the rack gear (10); A plate horizontally attached to one side of the lower end of the rack gear 10; A stretch rod 12 vertically installed on the lower side of the plate 11; An air flow-in portion 13 provided around a part of the stretch rod 12 and having an air inlet 13-2, an air outlet 13-3, and an air-sealing portion 13-1; And a blow nozzle 60 for injecting air into the pet preform 90 through the air inflow / outflow portion 13 so that air is injected into the pet preform 90 to expand the pet preform 90 in the circumferential direction of the pet preform.

In the vertically extending blow system of the conventional pet preform configured as described above, even though the rack gear 10 is vertically guided by the LM guide 80, when the rack gear 10 is used for a long period of time, And the stretch rod 12 vertically installed on the lower side of the plate 11 is installed on one side of the rack gear 10 and is weighted only on one side so that the guide rail of the LM guide 80 And the bearing may be worn or damaged. Therefore, the LM guide 80 often fails to guide accurate vertical movement of the rack gear 10.

If the LM guide 80 fails to guide the vertical movement of the rack gear 10, the stretch rod 12 vertically installed on the lower side of the plate 11 can not accurately perform vertical movement. In this case, the airtight seal portion 13-1 is worn by the stretch rod 12, which is vertically moved in the inclined direction, so that the seal rod 12 can not function as a seal, The stretch rod 12 can not accurately push the bottom center of the pet preform 90 when the pet preform 90 enters the pet preform 90 and the pet preform 90 is stretched. In this state, the stretch rod 12 pushes the portion off the center of the bottom of the pet preform 90 to stretch the pet preform 90 in the longitudinal direction of the pet preform, and the air is injected from the blow nozzle, The pet preform 90 may expand in the circumferential direction of the stretch in the longitudinal direction, but a phenomenon of chipping phenomenon, that is, a part of the pet preform 90 becomes thick and a part of the pet preform 90 becomes thin. As a result, (90) is defective and is destroyed.

As a conventional vertical drawing blow system of a related pet preform, Korean Patent Registration No. 10-1357989 (hereinafter referred to as "Prior Art 1") "Biaxially Oriented Blow Molded Container and its Manufacturing Method" .

In the above prior art 1, a pet preform having a layer made of a trimethylene naphthalate type polyester resin as described in claim 7 of the prior art 1 is formed by (i) biaxially oriented blow molding at a draw temperature of 110 to 130 캜 (ii) biaxial oriented blow molding and heat setting in a mold at 90 to 150 ° C, (iii) stretching at a temperature of 110 to 130 ° C, biaxial stretching blow molding in a mold at 90 to 150 ° C, , Or any one of them.

According to the constitution of the above-mentioned prior art 1, in a biaxially oriented blow-molded container made of a trimethylene naphthalate-based polyester resin, a biaxially oriented biaxially stretched blow molded container in which trimethylene naphthalate- A method for producing a recycled polyester resin excellent in transparency is provided from a multilayered container having a layer of a trimethylene naphthalate based polyester resin and an ethylene terephthalate based polyester resin by providing a blow molded container and a method of producing the same There is an effect.

In relation to the stretching in the length and the circumferential direction, the prior art 1 described above is characterized in that the pet preform is stretched by means of hot air, an infrared heater, high frequency induction heating, or the like before the stretch blow molding, The preheated pet preform up to the temperature is fed into a known draw blow molding machine and is set in a mold and is stretched in the axial direction by press fitting of the stretching rod and stretched in the circumferential direction by blowing of the fluid .

However, in the prior art 1, air is injected into the pet preform through the blow nozzle, and the pet preform is expanded in the circumferential direction thereof while pushing the pet preform bottom to reduce or eliminate the chipping phenomenon of the pet preform generated when the pet preform is stretched And does not disclose any consideration or configuration of the material, and thus has such a problem that such shearing phenomenon can occur at any time.

Korean Patent Registration No. 10-1357989 (Feb.

SUMMARY OF THE INVENTION The present invention has been conceived in order to solve the above problems, and it is an object of the present invention to provide a rack preloading apparatus and a rack preloading apparatus, in which a stretch rod vertically installed on a plate horizontally attached to a lower end of a rack gear enters a pet preform through a neck of a pet preform, The pet preform is inflated in its circumferential direction by injecting air into the pet preform. The pet preform is pushed to the floor to stretch the pet preform. When the pet preform is stretched and the air preform is not generated, Prevention, and confidentiality of the system.

The present invention has the following features in order to achieve the above object.

The vertical stretching, curling prevention, and airtightness maintaining system of the pet preform of the present invention comprises a vertical stand integrally formed with a horizontal stand on the ground; A servo motor provided on the front side of the vertical stand; A pinion disposed on one side of a rotary shaft of the servomotor and disposed on a rear side of the vertical base; A rack gear having teeth on one side thereof and vertically moving vertically with the teeth of the pinion meshing with the teeth; A plate horizontally attached to one side of the lower end of the rack gear, the plate having two or more protrusions projecting toward the vertical band and spaced apart from each other; Two or more LM guides, which include a guide rail and a bearing, and are provided on a back surface side of the vertical stand and are respectively engaged with the two or more protrusions to guide up and down vertical movement of the plate; A plurality of stretch rods vertically installed on the lower side of the plate; An air inflow / outflow portion provided around a part of the stretch rod and having an air inlet, an air outlet, and an air sealing portion; A blow nozzle injecting air into the pet preform through the air inflow / outflow portion to inject air into the air inflow / outflow portion so that the pet preform is expanded in a circumferential direction of the pet preform; And a guide block fixed to the upper surface of the vertical stand and spaced from the rack gear so as to prevent inclination of the lower portion of the rack gear toward the vertical stand and to guide up and down vertical movement of the rack gear .

The guide block includes at least one recess provided on an opposite side of the rack gear; A shaft hole penetrating a plurality of protrusions on the left and right sides of the at least one recess; An axis disposed within the shaft hole and the at least one recess; And a roll bearing installed around the shaft, the roll bearing extending partly into the one or more recesses and extending to an end face of the rack gear beyond an end face of the plurality of projections.

Characterized in that the axis is fixed by a set bolt located below the shaft portion located in at least one of the plurality of protrusions.

The fixed installation of the guide block includes a plurality of slots; And a bolt penetrating through the plurality of slots and fastened to the vertical bar to fix the guide block to the vertical bar.

And each of the plurality of slots has a longer length in a direction perpendicular to the axis than a length in a direction parallel to the axis.

The air sealing portion is characterized by being a copper bushing for maintaining airtightness with the stretch rod, or a PTFE belt in which Teflon and carbon are synthesized.

According to the present invention, the stretch rod provided vertically on the lower side of the horizontally attached plate on one side of the lower end of the gear, the stretch rod provided vertically on the pet preform through the neck of the pet preform, And then air is injected into the pet preform through the blow nozzle so that the pet preform is inflated in the circumferential direction while the pet preform is pushed to the bottom to stretch the pet preform so that the pet preform is not entangled and air sealing is maintained It is possible to provide a vertical stretching of a pet preform, prevention of curling, and a hermetic maintaining system.

1 is a cross-sectional view of one embodiment of a vertical stretching, curling prevention, and airtightness maintaining system of a pet preform according to a preferred embodiment of the present invention.
FIG. 2 is a front view of a vertical stretching, curling prevention, and airtightness maintaining system of a pet preform according to a preferred embodiment of the present invention.
Fig. 3 is a cross-sectional view showing a state in which the teeth of the pinion connected to one end of the servo motor and the teeth of the rack gear of Figs. 1 and 2 are engaged with each other.
4 is a horizontal sectional view of the guide block of Fig.
5 is a horizontal cross-sectional view of the LM guide and protrusions of the interdigitated plates of FIGS.
6 is a cross-sectional view of one side of a vertical drawing blow system of a conventional pet preform.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. For the sake of convenience, the size, line thickness, and the like of the components shown in the drawings referenced in the description of the present invention may be exaggerated somewhat. The terms used in the description of the present invention are defined in consideration of the functions of the present invention, and thus may be changed depending on the user, the intention of the operator, customs, and the like. Therefore, the definition of this term should be based on the contents of this specification as a whole.

FIG. 1 is a cross-sectional side view of a vertical stretching, curling prevention, and airtightness maintaining system of a pet preform according to a preferred embodiment of the present invention. FIG. 2 is a cross-sectional view of a pet preform according to a preferred embodiment of the present invention. 3 is a cross-sectional view showing a state in which the teeth of the pinion connected to one end of the servo motor and the teeth of the rack gear of Figs. 1 and 2 are engaged with each other.

1 to 3, the vertical stretching, curling prevention, and airtightness maintaining system of a pet preform according to an embodiment of the present invention includes a vertical stand 20; A servo motor 40; A pinion 70; A rack gear (10); LM guide 80; A plate 11; A stretch rod 12; An air inflow / outflow section 13; A blow nozzle 60; And a guide block (30).

The vertical bar 20 is integrally formed with the horizontal bar 50 on the ground, and vertically protrudes from one side of the horizontal bar 50.

On the front side of the vertical stand, a servo motor 40 is installed on one side,

The pinion 70 is disposed on one side of the rotary shaft of the servo motor 40 and disposed on the back side of the vertical base 20. The teeth of the pinion 70 and the teeth 10-1 are configured to mesh with each other. Since the pinion 70 is mounted on one side of the rotary shaft of the servo motor 40, power is supplied to the servo motor 40, The motor 40 is driven to rotate the rotary shaft of the servo motor 40 so that the pinion 70 mounted on the rotary shaft rotates and the rack gear 10 having the teeth 10-1 engaged with the pinion 70 Is vertically moved up and down in accordance with the rotation direction of the pinion 70. [

5 is a horizontal cross-sectional view of the LM guide and protrusions of the mutually coupled plates of FIGS.

5, the rack gear 10 vertically moving up and down as described above is guided by the LM guide 80. The LM guide 80 includes a guide rail and a bearing, And guide the upper and lower vertical motions of the plate 11 by engaging with the two or more protrusions 11-1 on the back side of the LM guide 80. The guide rails 80, A bearing (not shown) is provided between the bearing 11-1.

A plate 11 is horizontally attached to one side of a lower end of the rack gear 10. The plate 11 has two or more protrusions 11-1 protruding toward the vertical base 20 and spaced apart from each other . On the lower side of the plate 11, a plurality of, for example, six or eight stretch rods 12 are installed vertically.

An air inflow / outflow section 13 having an air inflow port 13-2, an air outflow port 13-3 and an air sealing section 13-1 is provided around a part of the stretch rod 12, The nozzle 60 injects air into the air inflow / outflow section 13, and the infused air flows through the air inflow / outflow section 13 into the pet preform 90 which is heated in a previous process and is in a soft state, The preform 90 is expanded in its circumferential direction. In the present embodiment, the air sealing portion 13-1 is a copper bushing that maintains airtightness with the stretch rod 12, or a PTFE belt in which Teflon and carbon are synthesized.

FIG. 4 is a horizontal sectional view of the guide block of FIG. 1, and FIG. 5 is a horizontal sectional view of the protrusions of the mutually coupled plates of FIGS. 1 and 2 and the LM guide.

4 and 5, the guide block 30 is fixed to the upper surface of the vertical table 20 and spaced apart from the rack gear 10 by a distance of, for example, 5-6 mm. The rack gear 10, Since the plate 11 is installed on the lower side of the vertical bar 20 on the opposite side of the vertical bar 20 so that the weight of one of the plates 11 is increased, the rack gear 10 tends to tilt toward the vertical bar 20. The guide block 30 prevents inclination of the lower portion of the rack gear 10 toward the vertical base 20 and at the same time guides the vertical movement of the rack gear 10.

Specifically, in this embodiment, the guide block 30 includes recesses 32A and 32B provided on opposite sides of the rack gear 10; Shaft holes 35A, 35B and 35C penetrating through the protrusions 33A, 33B and 33C on the left and right sides of the recesses 32A and 32B; A shaft 35 provided over the ophthalmic recesses 32A, 32B of the shaft holes 35A, 35B, 35C; 33B and 33C and extending to the end face of the rack gear 10. The other end of the rollers 10A and 20B is fixed to the end of the rack gear 10, And bearings 31A and 31B.

Therefore, even if the rack gear 10 guided by the LM guide 80 vertically and vertically repeatedly reciprocates vertically and vertically for a long period of time to cause the LM guide 80 itself to be worn out, The roll bearings 31A and 31B prevent the rack gear 10 from tilting toward the vertical table 20 through the gap between the guide block 10 and the guide block 30, As shown in FIG.

The stretch rod 12 provided under the rack gear 10 can also move up and down by the vertical movement of the rack gear 10 so that the stretch rod 12 is vertically moved downward The end of the stretch rod 12 can accurately press the center of the lower end surface of the pet preform 90 so that the pet preform 90 can be precisely pivoted during the stretching operation of the pet preform 90. [ 90 are vertically stretched vertically. At the same time, when the air is injected into the pet preform 90 through the blow nozzle 60, the pet preform 90 expands in the circumferential direction of the pet preform. Accordingly, the pet preform 90 can be prevented from being entangled, that is, a part of the pet preform 90 can be prevented from being thickened and a part of the pet preform 90 can be thinned, thereby ensuring the pet preform 90 in a satisfactory state, It is possible to prevent or reduce the abrasion of the airtight portion 13-1 by the stretch rod 12 by the reciprocating motion maintenance, and thus the airtightness maintenance of the air inflow / outflow portion 13 is possible.

The shaft 35 is fixed by a set bolt (not shown) below the portion of the shaft 35 located in at least one of the projections 33A, 33B and 33C.

Fixed mounting of the guide block (30) includes slots (30S1, 30S2, 30S3); And the bolts are inserted into the slots 30S1, 30S2 and 30S3 and are fastened to the vertical bar 20 to fix the guide block 30 to the vertical bar 20. The slots 30S1, 30S2, The length in the direction perpendicular to the shaft 35 is longer than the length in the direction parallel to the shaft 35. [ With this configuration, it is possible to adjust the gap of the guide block 30 with the rack gear 10 through the slots 30S1, 30S2, and 30S3 before the bolts are fastened and fixed at the time of installing the guide block 30 .

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. .

10: Rack gear 10-1: Toothed
11: Plate 12: Stretch rod
13: Air inflow / outflow section 13-1: Air sealing section
13-2: Air inlet 13-3: Air outlet
20: vertical stand 30: guide block
30S1, 30S2, 30S3: Slot 31A, 31B: Roll bearing
32A, 32B: recesses 33A, 33B, 33C: protrusions
35A, 35B, 35C: shaft hole 40: servo motor
50: Horizontal band 60: Blow nozzle
70: Pinion 80: LM Guide
90: pet preform

Claims (6)

A vertical table 20 formed integrally with the horizontal table 50 on the ground;
A servomotor (40) mounted on a front side of the vertical stand;
A pinion 70 installed on one side of the rotary shaft of the servomotor 40 and disposed on the rear side of the vertical base 20;
A rack gear (10) having teeth (10-1) at one side and the teeth of the pinion (70) and the teeth (10-1) engaged with each other and moving vertically;
A plate (11) horizontally attached to one side of the lower end of the rack gear (10) with two or more protrusions (11-1) projecting toward the vertical base (20) and spaced apart;
And at least two LMs (11, 12), which are provided on the back surface side of the vertical base (20) and which are coupled to the two or more protrusions (11-1) A guide 80;
A plurality of stretch rods 12 vertically installed on the lower side of the plate 11;
An air flow-in portion 13 provided around a part of the stretch rod 12 and having an air inlet 13-2, an air outlet 13-3, and an air-sealing portion 13-1;
Air is injected into the pet preform 90 through the air inflow and outflow portion 13 to inject air into the air inflow and outflow portion 13 so that the pet preform 90 is expanded in the circumferential direction of the pet preform, ; And
The rack gear 10 is fixed to the upper surface of the vertical bar 20 and spaced apart from the rack gear 10 to prevent inclination of the lower portion of the rack gear 10 toward the vertical bar 20, And a guide block (30) for guiding vertical up and down movement of the pet preform (10). The method according to claim 1,
The guide block (30)
One or more recesses (32A, 32B) provided on opposite sides of the rack gear (10);
A shaft hole (35A, 35B, 35C) passing through a plurality of projections (33A, 33B, 33C) on the left and right of the one or more recesses (32A, 32B);
A shaft 35 disposed within the shaft hole 35A, 35B, 35C and the one or more recesses 32A, 32B; And
33B and 33C and a plurality of protrusions 33A, 33B and 33C are provided around the shaft 35 and partially received in the one or more recesses 32A and 32B, The roll bearings 31A and 31B extending to the end surfaces of the rollers 31A and 31B,
Wherein the pre-stretch, the pre-curtain, and the confidential maintenance system of the pet preform are characterized by comprising: 3. The method of claim 2,
Characterized in that the shaft (35) is fixed by a set bolt below the portion of the shaft (35) located in at least one of the plurality of projections (33A, 33B, 33C) Anti-fouling, and confidentiality systems. The method of claim 3,
The fixed block of the guide block (30)
A plurality of slots (30S1, 30S2, 30S3); And
And a bolt for passing through the plurality of slots (30S1, 30S2, 30S3) and fastened to the vertical bar (20) to fix the guide block (30) to the vertical bar (20) Vertical stretching, anti-caking, and confidentiality systems. 5. The method of claim 4,
Wherein the plurality of slots (30S1, 30S2, 30S3) each have a longer length in a direction perpendicular to the axis (35) than a length in a direction parallel to the axis (35) Prevention, and confidentiality system. The method according to claim 1,
The air sealing portion (13-1) is a PTFE belt in which a copper bushing or a Teflon-carbon composite is maintained to maintain airtightness with the stretch rod (12). The vertical stretching of the Pet preform, Maintenance system.

Images