CN210026241U

CN210026241U - Novel stretch bending blow molding equipment for plastic bent bottle

Info

Publication number: CN210026241U
Application number: CN201920810568.8U
Authority: CN
Inventors: 黄伟镜
Original assignee: Foshan Qianfeng Industrial Co Ltd
Current assignee: Foshan Qianfeng Industrial Co Ltd
Priority date: 2019-05-30
Filing date: 2019-05-30
Publication date: 2020-02-07
Anticipated expiration: 2029-05-30

Abstract

The utility model relates to the field of plastic forming equipment, in particular to novel stretch-bending and blowing forming equipment for plastic bent bottles, which comprises a material conveying device, a heating device and a stretch-blowing device, wherein the heating device comprises a plurality of heating wires which are arranged above the material conveying device in parallel and can be independently controlled by temperature; the drawing and blowing device comprises an ejector rod, a blowing mechanism, a lower die set, an upper die set and a mechanical claw; the mechanical claw is a clamp which is used for grabbing the tail material at the tail end of the bottle blank and moves along an arc track with the bottle blank bending point as the center of a circle, and a transmission rod which drives the mechanical claw to move is arranged above the mechanical claw. The utility model discloses the curved bottle of plastics or return bend of production have machining efficiency height, raw materials high-usage, the body of blowing more exquisite pleasing to the eye, thinner more even advantage.

Description

Novel stretch bending blow molding equipment for plastic bent bottle

Technical Field

The utility model relates to a plastics former field specifically discloses a novel stretch bending blow molding equipment of curved bottle of plastics.

Background

With the development of modern chemical industry, plastic products become the first choice for commodity packaging, and the production and life of people are greatly facilitated due to the characteristics of beating resistance, antibiosis, good sealing, chemical stability and recyclability.

The existing plastic bottles are generally used for packaging beverages, medicines and chemical preparations, the production amount is very large, and the industrial production degree is very high. The existing plastic bottle industrial production generally has two modes:

one is an extrusion blowing process, wherein plastic raw materials are extruded to drop from top to bottom through an extrusion port, clamped by a mold, cut and blown to form;

the other method is that after plastic material is first injection molded into bottle blank, the bottle blank is heated and drawn to certain height inside a drawing and blowing machine to close the mold, and high pressure air is then blown into the bottle blank for final formation.

The two methods are the most common industrial plastic bottle production processes, but both methods have a defect that the produced plastic bottles are generally straight bottles, namely, the produced plastic bottles always comprise an axis which penetrates through the whole bottle mouth, the whole bottle body and the whole bottle bottom.

Through the extrusion-blow technology, a large bending mould is opened, and a bent bottle or a bent pipe is blown by cutting off redundant raw materials of a vertical part, however, the mode has high requirements on a die assembly side edge of the mould, and the side surface of the produced plastic bottle has a heavy die assembly line, is not attractive and harsh to touch, and has low structural strength at the die assembly position and is fragile. The mold clamping line is difficult to control, a large amount of raw materials are wasted, the production efficiency is low, the quality is difficult to control, and the precision requirement on the mold and the processing equipment is higher.

However, in some applications, an integrally bent plastic bottle or a plastic elbow is required, such as a bent-mouth bottle which is convenient for a patient to open the bottle directly to take a medicine without raising his head. The existing large-scale production mode cannot meet the actual requirement, if the traditional extrusion blowing process is adopted for production, a large amount of plastic raw materials are wasted and cut at the turning position, the process requirement is more severe during realization, the finished product rate is low, and the product thickness is difficult to control.

SUMMERY OF THE UTILITY MODEL

In order to overcome the problem that the existing plastic bent bottle is difficult to realize through the large-scale production of the stretch-blow process, the utility model provides a novel stretch-blow molding equipment for the plastic bent bottle.

The utility model adopts the technical proposal that: a novel stretch bending blow molding device for plastic bent bottles comprises a material conveying device, a heating device and a stretch blowing device, wherein the stretch blowing device comprises an ejector rod, an air blowing mechanism and a die closing mechanism; the die assembly mechanism comprises a lower die set for fixing a bottle opening and an upper die set comprising a bent cavity corresponding to a plastic bent bottle, the lower die set and the upper die set are respectively a left half die and a right half die which are arranged in parallel along the vertical direction, lower die assembly driving parts are arranged on two sides of the lower die set, and upper die assembly driving parts are arranged on two sides of the upper die set; and a power mechanism for driving the mechanical claw to move along an arc track with a bottle blank bending point as a circle center is arranged above the mechanical claw.

Preferably, a transmission rod is arranged above the mechanical claw, and the other end of the transmission rod is connected with a power mechanism.

Preferably, a mechanical claw fixing frame is arranged on the side surface of the mechanical claw, and a track limiting mechanism used for assisting in positioning the motion track of the mechanical claw is arranged on the inner wall of the mechanical claw fixing frame.

Preferably, the heating device comprises a plurality of heating wires which are arranged above the material conveying device in parallel and each heating wire can independently control the temperature.

Preferably, when the upper die set is opened, the width between the upper die sets is larger than the widest position of the mechanical claw between the upper die sets, and a cavity corresponding to the mechanical claw is reserved at the position of the upper die set corresponding to the bent mechanical claw.

Preferably, the heating device is a heating wire horizontally arranged above the material conveying device in parallel, a plurality of independent stations are arranged in the material conveying device, a rotating mechanism used for driving the bottle blanks to rotate is arranged in each station, and each heating wire is connected with an independent temperature control circuit.

Preferably, the stretch-blow device further comprises a material shearing mechanism for shearing off the tailings.

Preferably, the material shearing mechanism is arranged at the front end of the mechanical claw.

Preferably, the material shearing mechanism is arranged at the rear end of the material conveying device positioned at the pulling and blowing device.

The utility model has the advantages that: through the bending process, large-scale industrial production of bent plastic bottles or bent plastic pipes can be realized, compared with the traditional special-shaped bottle injection molding, a large amount of raw materials with edges needing to be cut off are saved, the requirements on the cutting force and the strength of the die are reduced, and therefore the precision of the die is improved, and the die opening cost is reduced. Because the temperature of the bottle blank and the thickness of the blank wall are easier to control, the plastic bent bottle or bent pipe produced by the equipment has the advantages of high processing efficiency, high raw material utilization rate, more exquisite and beautiful blown bottle body and thinner and more uniform bottle body.

Drawings

Fig. 1 is a schematic view of the heating device of the present invention.

Fig. 2 is a schematic view of the internal structure of the lower mold closing device of the present invention.

Fig. 3 is a front view of the stretched bottle preform of the present invention.

Fig. 4 is a schematic view of the internal structure of the bottle blank of the present invention.

Fig. 5 is a schematic view of the bottle blank of the present invention.

Fig. 6 is a schematic view of the plastic curved bottle of the present invention.

Fig. 7 is a schematic view of the special-shaped plastic bent bottle of the present invention.

In the figure: 101. bottle blank 102, bottle mouth 103 and tail material; 201. the device comprises a material conveying device 202, a station 203, a rotating mechanism 204 and a bottle mouth fixing piece; 301. a heating vertical base 302 and a heating wire; 401. a push rod motor 402, a push rod 403, a positioning piece 404, a push rod 405 and a base; 501. an air pump 502, an air delivery pipe 503 and an air blowing mechanism; 601. a lower die set, 602, an upper die set, 603, a lower die cavity, 604, an upper die cavity, 605, a lower die closing driving part, 606, an upper die closing driving part, 607 and a side wall vertical plate; 701. the mechanical claw fixing frame comprises a mechanical claw 702, a mechanical claw fixing frame 703, a track limiting mechanism 704, a transmission rod 705 and a power mechanism.

Detailed Description

Referring to fig. 1 to 7, the utility model relates to a novel stretch bending blow molding equipment of curved bottle of plastics, include: material conveying device 201, heating device and drawing and blowing device.

The heating device is arranged at the front end of the material conveying device 201, and the drawing and blowing device is arranged at the rear end of the material conveying device 201.

Referring to fig. 5, a bottle mouth 102 is arranged at the upper end of the bottle blank 101, an outward-protruding tailing 103 is arranged in the middle of the lower end of the bottle blank 101, and the tailing 103 is a cylindrical or pointed-conical injection molding runner reserved during injection molding of the bottle blank 101.

Referring to fig. 1, the heating device includes a plurality of heating wires 302 arranged in parallel on two sides of the upper portion of the material conveying device, one side of the heating wires 302 facing the outer side of the material conveying device 201 is provided with a heating vertical seat 301 for fixing the heating wires 302 and focusing heat radiation, and the heating wires 302 are embedded in a groove on the inner wall of the heating vertical seat 301 or fixed in the middle of the groove in a suspending manner.

Every heater strip 302 homoenergetic independently carries out temperature control, and heating device corresponds every heater strip outward and is equipped with independent control by temperature change circuit, can carry out the segmentation heating of different temperatures to bottle embryo 101, and the heating control by temperature change precision is accurate to 0.1 degree. The heating device on the material conveying device 201 can be divided into a single section or multiple sections, and the multi-section heating device can realize segmented preheating and final heating, so that the heating process is more stable.

The material conveying device 201 is provided with a plurality of stations 202 which are used for circulating and moving on the material conveying device 201 in a unidirectional mode, the stations 202 are internally provided with rotating mechanisms 203 used for driving the bottle blanks 101 to rotate, and a bottle opening fixing piece 204 used for fixing the bottle openings 102 is arranged in the middle of the stations 202.

In addition, the heating wire 302 in the heating device can be provided with the heating wire 302 only on one side, or can be provided with the heating wire 302 on both sides as shown in the figure, and the material conveying device 201 in the heating device can be simultaneously distributed with single-row or double-row stations 202, and can simultaneously heat a plurality of bottle blanks 101 distributed in single-row or double-row, so as to shorten the size of the heating device, and play a role of energy saving by reducing the movement speed of the stations 202.

The material conveying device 201 of this embodiment is set to be annular, and after the feeding mechanism or the manual work were fixed in the bottle embryo 101 on the station 202, the incessant circulation of material conveying device 201 transported the bottle embryo 101 and passed through heating device, got into after the heating and draw and blow the device blow molding, and the curved bottle of plastics after the shaping got into the finished product and placed the district after breaking away from station 202 through manual work or mechanical equipment.

Referring to fig. 2 to 4, the stretch blow device includes a ram 404, a blow mechanism 503, a lower die set 601, an upper die set 602, and a gripper 701.

A push rod motor 401 for jacking the push rod 404 upwards is arranged below the push rod 404, a base 405 for supporting a drawing and blowing device is arranged below the material conveying device 201, the push rod motor 401 is fixed in the base 405, and a first through hole for allowing the push rod 404 to pass through is formed in the middle of the bottle mouth fixing piece 204; the top of the push rod 402 at the upper end of the push rod motor 401 is provided with a positioning piece 403 for increasing the motion precision of the push rod 404, so that the push rod 404 can be vertically arranged.

The top end of the ram 404 is preferably spherical or arcuate.

The blowing mechanism 503 comprises a blowing nozzle for blowing air into the bottle parison 101 through the first through hole and an electromagnetic valve for adjusting the air output, an air pipe 502 is arranged below the blowing mechanism 503, and an air pump 501 is arranged at the other end of the air pipe 502.

The lower die set 601 is used for fixing the bottle mouth 102, the upper die set 602 comprises a bending cavity corresponding to a plastic bent bottle, the lower die set 601 and the upper die set 602 are respectively a left half die and a right half die which are arranged in parallel along the vertical direction, a lower die cavity 603 is arranged in the lower die set 601, and an upper die cavity 604 is arranged in the upper die set 602. Wherein, the boundary line of the lower die set 601 and the upper die set 602 is located in the middle area of the bending point of the bottle mouth 102 and the bottle blank 101.

The lower die assembly driving part 605 is arranged on two sides outside the lower die set 601, and the upper die assembly driving part 606 is arranged on two sides outside the upper die set 602.

The lower die closing driving part 605 and the upper die closing driving part 606 have two design ideas, one is that 2 sets of die closing driving parts which independently run are separately arranged, and a push rod motor or an air cylinder is adopted to provide power. The other is that the lower mold closing driving member 605 is a set of elastic mechanisms, such as springs or pneumatic rods, the other end of the springs is connected with the pushing surface of the upper mold closing driving member 606, the two sides of the lower mold assembly 601 respectively protrude out of the upper mold assembly 602 by the difference of the extension length of one elastic mechanism, at this time, when the upper mold closing driving member 606 starts to close, the lower mold assembly 601 protrudes out of the upper mold assembly 602, therefore, the lower mold assembly 601 is closed first, and then, when the upper mold closing driving member 606 continues to push in the box, the elastic mechanism of the lower mold closing driving member 605 is compressed and shortened, and finally, the upper mold assembly 602 is also closed. Fixed vertical plates 607 are arranged on two sides of the drawing and blowing device, an upper die set 602 is movably fixed in the middle of the inner walls of the fixed vertical plates 607 through an upper die assembly driving part 606, and a lower die set 601 is movably fixed below the inner walls of the fixed vertical plates 607 through a lower die assembly driving part 605.

The lower die set 601 and the upper die set 602 are also provided with a cooling mechanism, and cooling liquid is injected into the interior of the grinding tool through a water pump to assist in cooling the die, so that the upper die cavity 604 and the lower die cavity 603 are kept at a certain low temperature, and cooling and shaping of the plastic bottle are accelerated.

The middle of the upper part of the upper die set 602 is provided with a mechanical claw 701 for gripping the tailings 103, a transmission rod 704 is arranged above the mechanical claw 701, and the other end of the transmission rod 704 is provided with a power mechanism 705 for driving the mechanical claw 701 to move along an arc track with the bending point of the bottle blank 101 as the center of a circle through the transmission rod 704. The utility model provides a mainly possess can fix and loosen bottle embryo tails and the mechanism of motion of buckling, all belong to the protection scope of this application.

When the upper mold set 602 is opened, the middle width is larger than the widest position of the gripper 701 between the upper mold set 602, and a corresponding cavity is reserved at the position of the upper mold set 602 corresponding to the bent gripper 701, that is, the final mold cavity integrally includes an upper cavity 604, a lower cavity 603, a bottleneck fixing member 204 and the front end of the gripper 701.

A bottleneck fixing groove is formed in the lower cavity 603 corresponding to the bottleneck 102.

A mechanical claw fixing frame 702 is arranged above the inner wall of the fixed vertical plate 607, a rail limiting mechanism 703 for limiting the movement track of the mechanical claw 701 is arranged on the inner wall of the mechanical claw fixing frame 702, and the rail limiting mechanism 703 can adjust the fixed position and can replace different arc tracks.

The lower end of the gripper 701 is provided with a material shearing mechanism for shearing the tailings 103, or the rear end of the material conveying device 201 is provided with an independent material shearing mechanism for shearing the tailings 103.

Referring to fig. 1 to 4, the plastic bent bottle of the present embodiment is specifically processed as follows:

s1, heating, namely heating the bottle blank 101 through a heating device to soften the bottle blank;

s2, fixing the bottle mouth 102, enabling the bottle blank 101 to enter a drawing and blowing device, and closing the lower grinding tool set 601 to fix the bottle mouth 102;

s3, stretching, namely stretching a push rod 402 into the bottle opening 102 and propping against the bottom of the bottle blank 101, continuously raising the push rod 402 until the bottle blank 101 is stretched to the total length of a plastic bent bottle, and then fixing the reserved tailing 103 at the tail end of the bottle blank 101 by a bending mechanism through a mechanical claw 701;

s4, bending, namely withdrawing the push rod 402, and driving the stretched bottle blank 101 to perform bending action by the bending mechanism to enable the bottle blank 101 to be bent at a bending position by a specified angle;

s5, performing blow molding, closing the upper mold group 602, filling high-pressure gas into the bottle mouth 102 through the blowing mechanism 503 to expand the bottle blank into the shape of the mold cavity, simultaneously cooling and shaping the plastic bent bottle through the mold, and opening the upper mold group 602 and the lower mold group 601;

s6, cutting the tailings, moving the shaped plastic bent bottle out of the die assembly mechanism, and cutting the tailings 103 through the material cutting mechanism to finish the final production of the plastic bent bottle.

Fig. 1 corresponds to step S1, fig. 2 corresponds to step S2, fig. 3 corresponds to step S3, and fig. 4 corresponds to step S4 and step S5.

Referring to fig. 6 and 7, there are shown two types of plastic curved bottles without shearing the tailings 103, which are processed by the present embodiment, wherein the plastic curved bottle of fig. 6 is bent at the middle section of the bottle blank 101, and the plastic curved bottle of fig. 7 is bent at the bottle mouth of the bottle blank 101.

The method for positioning the bending point of the bottle blank 101 by the equipment comprises the following 3 steps:

one is as follows: when the bending point is close to the bottleneck 102, the center of a circle of a motion track of the mechanical claw 701 is adjusted to be aligned with the bending point, the lower die set 601 is closed to fix the bottleneck 102, after the ejector rod 404 exits from the bottleneck 102, the tail material 103 is directly driven to bend through the motion of the mechanical claw 701, and at the moment, because the lower die set is used as a stress support at the bottleneck 102, the bending point is close to the bottleneck 102;

the second step is as follows: controlling the bending position through temperature difference, when the bending point is in the middle section of the bottle blank 101, when the bottle blank is heated, increasing the heating temperature of 10% -30% for the heating wire 302 at the bending position, adjusting the circle center of the motion track of the mechanical claw 701 to be aligned with the bending point, after the ejector rod 404 exits from the bottle opening 102, directly driving the tailing 103 to bend through the motion of the mechanical claw 701, and at the moment, because the temperature of the bottle blank 101 at the bending position is higher than that of the rest positions, the plastic is softer, and the bending point is ensured to be positioned at the bottle blank 101 with increased temperature;

and thirdly: the bending position is positioned through the ejector rod 404, the circle center of the motion track of the mechanical claw 701 is adjusted to be aligned with the bending point, after the ejector rod 404 finishes the action of stretching the bottle blank, the ejector rod 404 is lowered to the bending position and stops, at the moment, the tail material 103 is driven to bend through the motion of the mechanical claw 701, and the bending point of the bottle blank 101 is located at the top end of the ejector rod 404 when the bottle blank is bent due to the fact that the bending position is propped against the top of the ejector rod 404, and therefore creases can be possibly left on the flat inner.

The three bending point positioning modes can be combined or used independently, the bending point of the bottle blank 101 is accurately controlled, and the finally blown plastic bent bottle wall is uniform and attractive.

Claims

1. The utility model provides a novel stretch-bending blow molding equipment of curved bottle of plastics, includes material conveyor (201), heating device and stretch-blow device, characterized by:

the drawing and blowing device comprises a push rod (404), a blowing mechanism (503) and a die clamping mechanism; the mold closing mechanism comprises a lower mold set (601) used for fixing a bottle opening (102) and an upper mold set (602) containing a bending cavity corresponding to a plastic bent bottle, the lower mold set (601) and the upper mold set (602) are a left half mold and a right half mold which are arranged in parallel along the vertical direction, lower mold closing driving parts (605) are arranged on two sides of the lower mold set (601), and upper mold closing driving parts (606) are arranged on two sides of the upper mold set (602);

the middle of the upper part of the upper die set (602) is provided with a mechanical claw (701) for bending the bottle blank (101), and a power mechanism (705) for driving the mechanical claw (701) to move along an arc track with a bending point of the bottle blank (101) as a circle center is arranged above the mechanical claw (701).

2. The novel stretch blow molding apparatus for plastic curved bottles of claim 1, wherein: a transmission rod (704) is arranged above the mechanical claw (701), and the other end of the transmission rod (704) is connected with a power mechanism (705).

3. The novel stretch blow molding apparatus for plastic curved bottles of claim 1, wherein: the side surface of the mechanical claw (701) is provided with a mechanical claw fixing frame (702), and the inner wall of the mechanical claw fixing frame (702) is provided with a track limiting mechanism (703) for assisting in positioning the motion track of the mechanical claw (701).

4. The novel stretch blow molding apparatus for plastic curved bottles of claim 1, wherein: the lower die closing driving part (605) is an elastic mechanism of which the tail end is connected with the upper die closing driving part (606).

5. The novel stretch blow molding apparatus for plastic curved bottles of claim 1, wherein: the heating device comprises a plurality of heating wires (302) which are arranged above the material conveying device in parallel and each heating wire can independently control the temperature.

6. The novel stretch blow molding apparatus for plastic curved bottles of claim 1, wherein: when the upper die set (602) is opened, the width between the upper die set (602) is larger than the widest position of the mechanical claw (701) between the upper die set (602), and a cavity corresponding to the mechanical claw (701) is reserved at the position, corresponding to the bent mechanical claw (701), of the upper die set (602).

7. The novel stretch blow molding apparatus for plastic curved bottles of claim 1, wherein: the heating device is a heating wire (302) horizontally arranged on the side face above the material conveying device (201) in parallel, a plurality of independent stations (202) are arranged in the material conveying device (201), a rotating mechanism (203) used for driving the bottle blanks (101) to rotate is arranged in each station (202), and each heating wire (302) is connected with an independent temperature control circuit.

8. The novel stretch blow molding apparatus for plastic curved bottles of claim 1, wherein: the device also comprises a material shearing mechanism for shearing the tailings (103).

9. The stretch blow molding apparatus for plastic curved bottles of claim 8, wherein: the material shearing mechanism is arranged at the front end of the mechanical claw (701).

10. The stretch blow molding apparatus for plastic curved bottles of claim 8, wherein: the material shearing mechanism is arranged at the rear end of the drawing and blowing device, and the material conveying device (201) is positioned at the rear end of the drawing and blowing device.