WO2020098237A1

WO2020098237A1 - Connecting rod mechanism for linkage of die bases of bottle blowing machine

Info

Publication number: WO2020098237A1
Application number: PCT/CN2019/087182
Authority: WO
Inventors: 冯志华; 倪俊芳; 钱志良; 王家善; 刘丁丁; 吴书朋; 叶鹏
Original assignee: 江苏新美星包装机械股份有限公司
Priority date: 2018-11-15
Filing date: 2019-05-16
Publication date: 2020-05-22
Also published as: CN109263023B; CN109263023A

Abstract

A connecting rod mechanism for linkage of die bases of a bottle blowing machine. A bottom die base (5) is provided with a wedge-shaped annular groove, and a left die base (3) and a right die base (4) are each provided with a wedge-shaped clamping ring; a rack (2) is provided with a support (10) positioned under the bottom die base (5); the connecting rod mechanism comprises a second shaft (6) disposed on the rack (2), a first swing arm (7) fixedly disposed on the second shaft (6), a first driving mechanism disposed between the second shaft (6) and a die opening and closing base, a cam mechanism for driving the first swing arm (7), a reset spring (11) disposed between the bottom die base (5) and the support (10), a first connecting rod (12) having one end thereof hinged onto the first swing arm (7), a second connecting rod (13) having one end thereof hinged onto the bottom die base (5), and a third connecting rod (14) having one end thereof hinged onto the support (10) and the other end separately hinged to the first connecting rod (12) and the second connecting rod (13); only one of the three connecting rods is broken from the middle and thus forms a connecting mechanism having at least one redundant degree of freedom; the connecting rod having the connecting mechanism has straightened and non-straightened states. The problem that the bottom die base (5) cannot move when the left die base (3) and the right die base (4) start to be opened or is almost closed is solved.

Description

Connecting rod mechanism used for linkage of mold blowing frame of bottle blowing machine

Technical field

The invention relates to the technical field of bottle blowing machines, in particular to a link mechanism used for the linkage of the mold frame of the bottle blowing machine.

Background technique

The bottle blowing machine is the key equipment for producing plastic bottles for various liquid packages (filling). Generally, the bottle blowing machine contains left and right mold frames that can be opened and closed in a plane. The left and right mold frames are built with molds respectively. The left and right mold frames swing to form the opening and closing of the mold frame by the opening and closing mold mechanism. Closed, there is a bottom mold controlled by the precession mechanism in another plane perpendicular to the swing motion plane of the left and right mold bases. When the left and right molds are closed and close to close, the wedge card of the built-in molds of the left and right mold bases The ring is gradually embedded into the wedge-shaped ring groove of the bottom mold precessing until it locks and forms a cavity that is consistent with the appearance of the desired processed product (plastic bottle). The preforms processed by the heating process are sent to the aforementioned cavity by the preform feeding mechanism, and the required processed products (plastic bottles) are finally formed by blowing, stretching, cooling and other processes, and then removed by the bottle taking mechanism and sent to the next channel Process. The blow molding machine has strict requirements for each process and high mutual cooperation requirements, especially for the synchronization between the mold frame and the bottom mold.

In the prior art, according to the division of power source transmission, the movement forms of the bottom mold and the mold frame are divided into two types: separation type and linkage type. Separate bottom mold motion control mechanism is limited by factors such as design, manufacturing, and installation due to the opening and closing mold motion control mechanism of the mold frame. The synchronous linkage of the two movements is affected. The dynamic characteristics of the mechanism are poor, resulting in bottle blowing The increase in machine speed is limited. The power of the linked bottom mold motion control mechanism is derived from the rotor arm of the mold opening and closing cam, so the bottom mold and the mold frame movement have good consistency. Since the plane of swinging movement of the opening and closing mold and the plane of movement of the bottom mold are perpendicular to each other, the linkage between the bottom mold and the mold frame is difficult to be realized by the plane mechanism. There are two main types of linkage: one is the cylindrical cam type (mechanism); the other is the compound type (mechanism) of space four-bar and plane cam. The cylindrical cam has a single structure and few moving parts, but the cylindrical cam is a space cam. The design and processing of the cylindrical cam flange or groove profile, especially the installation and positioning of the cylindrical cam center, is difficult. The rotor and the cam profile are easy Stuck or only form point contact, the compressive stress is large, and the amount of wear is relatively large, especially when the bottom die has a large stroke, the pressure angle of the cylindrical convex profile surface restricted by the space size will increase sharply, resulting in more serious wear; space four The design, processing and installation of the compound contour of the connecting rod and the flat cam is simpler than that of the cylindrical cam, but when the space four-bar linkage is compressed, its weak points of poor bearing capacity will be exposed, directly affecting the whole machine of the bottle blowing machine High-speed performance.

Summary of the invention

The purpose of the present invention is to provide a link mechanism for the linkage of the mold frame of a bottle blowing machine, which solves the problem that the bottom mold frame cannot move when the left mold frame and the right mold frame are opened and near the closing stage in the linkage mechanism.

To achieve the above objectives, the technical solutions adopted by the present invention are:

A link mechanism used for linkage of the mold frame of the bottle blowing machine is used for linkage of the mold opening and closing mold base and the bottom mold base. The opening and closing mold base includes a left side rotating on a first axis and arranged on the frame A mold base and a right mold base, the bottom mold base is raised and lowered along a bottom mold guide post fixed on the frame, the bottom mold base is provided with a wedge-shaped ring groove, the left mold base and the right Each of the mold frames is provided with a wedge-shaped snap ring for snapping into the wedge-shaped ring groove; the link mechanism includes a second shaft that is rotated on the axis of the shaft and is fixed on one end A first swing arm on the second shaft for driving the rotation of the second shaft, and provided between the second shaft and the mold opening and closing mold holder for rotating the second shaft A first driving mechanism that drives the left mold holder and the right mold holder to cooperate with each other in rotational mold opening or rotational mold clamping, and a cam mechanism for driving the first swing arm to swing, the frame is provided with a A bracket below the bottom mold formwork;

The link mechanism further includes a second drive mechanism and a return spring provided between the bottom mold formwork and the bracket for providing an elastic restoring force that drives the bottom formwork rise;

The second drive mechanism includes a first link hinged at one end to the first swing arm, a second link hinged at one end to the bottom mold form, and a third link hinged at one end to the bracket Rod; the other end of the third link is hinged to the other end of the first link and the other end of the second link; the first link, the second link, the The third connecting rod, one of which has only one connecting rod disconnected therefrom and forms a connecting mechanism with at least one redundant degree of freedom;

The connecting rod with connecting mechanism includes unstraightened state and straightened state;

When the mold is opened, the first swing arm swings forward: Before the wedge-shaped snap ring is detached from the wedge-shaped ring groove, the connecting rod with the connecting mechanism is in an unstraightened state; when the wedge-shaped snap ring is detached from the wedge After the ring groove, the connecting rod with the connecting mechanism is in a straightened state;

When the mold is closed, the bottom mold base rises and resets. Before the wedge-shaped snap ring enters the wedge ring groove, the connecting rod with the connecting mechanism is in a straightened state; the bottom mold base stops rising, and the first A swing arm continues to swing in the reverse direction. After the wedge-shaped snap ring enters the wedge-shaped ring groove, the connecting rod with the connecting mechanism is in an unstraightened state.

Preferably, the first connecting rod, the second connecting rod, and the third connecting rod, and only one of the three connecting rods is disconnected from the connecting rod at least once, and each opening is formed The connection mechanism is described.

More preferably, the connection mechanism is a hinge point with a redundant degree of freedom.

More preferably, the connection mechanism is a flexible connection with at least one redundant degree of freedom.

Preferably, the first connecting rod is disconnected therefrom to form a front holding hand and a rear holding hand, and the front holding hand and the rear holding hand are hinged to each other.

Preferably, when the bottom mold holder is clamped in place, both the second link and the third link extend in the vertical direction.

More preferably, the bracket is further provided with a limit block, and when the third link extends in the vertical direction, the limit block is pressed against a part of the third link that is away from the first link side.

Preferably, the first driving mechanism includes a second swing arm fixedly connected to the second shaft, and a link of a mold opening and closing mechanism disposed between the second swing arm and the mold opening and closing mold frame .

Preferably, the cam mechanism includes a cam rotor provided on the first swing arm, and a cam guide rail for driving the first swing arm through the cam rotor.

Due to the application of the above technical solutions, the present invention has the following advantages compared with the prior art: The present invention provides a link mechanism for the linkage of the mold frame of a blow molding machine. By providing at least one redundant degree of freedom on a link The connecting mechanism not only makes the left mold frame and the right mold frame open at the beginning, the connecting rod is not straightened to form a redundant amount, and the bottom mold frame cannot be driven to link, so that the wedge-shaped snap ring and the wedge-shaped ring groove can be smoothly disengaged. When the connecting rod is straightened, the bottom mold base is lowered synchronously with the mold opening. When the bottom mold base is raised and reset, the connecting rod is straightened, which drives the left mold base and the right mold base to synchronously close the mold. When the die frame is close to the closing stage, the connecting rod is turned to form a redundant amount, that is, the die frame of the bottom die cannot be driven upward when the mold clamping is continued, so that the wedge-shaped snap ring can be smoothly inserted into the wedge-shaped ring groove.

BRIEF DESCRIPTION

Figure 1 is a schematic structural diagram 1 of the device of the present invention;

Figure 2 is a second structural diagram of the device of the present invention;

Figure 3 is a schematic diagram of the device of the present invention.

Among them: 1. The first shaft; 2. The frame; 3. The left mold frame; 4. The right mold frame; 5. The bottom mold frame; 6. The second axis; 7. The first swing arm; 8. The second swing Arm; 9, opening and closing mechanism connecting rod; 10, bracket; 11, return spring; 12, first connecting rod; 121, front holding hand; 122, rear holding hand; 123, hinge point; 13, second connecting rod; 14 3. Third connecting rod; 15. Limit block; 16. Cam rotor; 17. Bottom mold guide post.

detailed description

The technical solution of the present invention will be further elaborated below with reference to the drawings.

As shown in FIGS. 1-3, the above-mentioned link mechanism for the linkage of the mold frame of the bottle blowing machine is used for linkage of the opening and closing mold frame and the bottom mold frame 5.

The mold opening and closing mold base includes a left mold base 3 disposed on the frame 2 rotating around the first axis 1, and a mold base 2 rotating around the first axis 1 disposed on the frame 2 to cooperate with the left mold base 3 to open and close the mold The right mold frame 4; the bottom mold frame 5 moves up and down along the bottom mold guide column 17 fixed on the frame 2 (bracket 10). The bottom mold frame 5 is provided with a wedge-shaped ring groove, and the left mold frame 3 and the right mold frame 4 are provided with a wedge-shaped snap ring for snapping into the wedge-shaped ring groove.

The above-mentioned link mechanism for the linkage of the mold frame of the bottle blowing machine includes a second shaft 6 provided on the frame 2 rotating around its own axis, and one end fixed on the second shaft 6 for driving the second shaft The first swing arm 7 which is rotated by the two shafts 6 and the rotation opening which is provided between the second shaft 6 and the mold opening and closing mold to drive the left mold base 3 and the right mold base 4 to cooperate with each other when the second shaft 6 rotates The first driving mechanism for the mold or the rotary mold clamping, and the cam mechanism for driving the first swing arm 7 to swing. The frame 2 is provided with a bracket 10 located under the bottom mold frame 5. The frame 2 and the bracket 10 are integrally formed.

In this embodiment, the first shaft 1 and the second shaft 6 both extend in the vertical direction; the first drive mechanism includes a second swing arm 8 fixedly connected to the second shaft 6, a second swing arm 8 and The opening and closing mechanism connecting rod 9 between the opening and closing mold frames; the cam mechanism includes a cam rotor 16 provided on the first swing arm 7 and a cam guide rail for driving the first swing arm 7 through the cam rotor 16.

The above-mentioned link mechanism for the linkage of the mold base of the bottle blowing machine further includes a second driving mechanism, which is provided between the bottom mold base 5 and the bracket 10 and is used to provide an elastic restoring force for driving the bottom mold base 5 upward. Reset spring 11.

The above-mentioned second driving mechanism includes a first link 12 hinged to the first swing arm 7 at one end, a second link 13 hinged to the bottom mold frame 5 at one end, and a third link 14 hinged to the bracket 10 at one end ; The other end of the third link 14 is hinged to the other end of the first link 12 and the other end of the second link 13, respectively; The first connecting rod 12, the second connecting rod 13, and the third connecting rod 14, some of which have only one connecting rod disconnected from it at least once and form a connecting mechanism, the connecting mechanism has at least one redundant degree of freedom, each Each disconnected place forms a connecting mechanism. The connecting mechanism may be a hinge point 123 with one redundant degree of freedom, or a flexible connecting piece with at least one redundant degree of freedom. By providing the connection mechanism with at least one redundant degree of freedom, the connecting rod with the connection mechanism includes an unstraightened state and a straightened state. In this embodiment, the first link 12 is disconnected therefrom to form a front holding hand 121 and a rear holding hand 122, and the front holding hand 121 and the rear holding hand 122 are hinged to each other.

When the mold is opened, the first swing arm 7 swings forward, and the first driving mechanism drives the mold opening and closing mold holder to open the mold. Before the wedge-shaped snap ring comes out of the wedge-shaped ring groove, the first link 12 with the connecting mechanism is not straightened. In the state, the bottom mold base 5 does not move, forming a mold-opening idle period for the bottom mold base 5; after the wedge-shaped snap ring leaves the wedge-shaped ring groove, the first connecting rod 12 with the connecting mechanism is in a straightened state, the first swing The arm 7 continues to swing forward, the mold opening and closing mold base continues to open the mold, and the bottom mold base 5 is simultaneously lowered;

When the mold is closed, the bottom mold base 5 rises and resets. Before the wedge-shaped snap ring enters the wedge-shaped ring groove, the first connecting rod 12 with the connecting mechanism is in a straightened state, and the first swing arm 7 is synchronously reversed and driven to open and close Simultaneous mold clamping of the mold base; the bottom mold base 5 stops rising, and the first swing arm 7 continues to swing in reverse. After the wedge-shaped snap ring enters the wedge-shaped ring groove, the first connecting rod 12 with the connecting mechanism is in an unstraightened state. The bottom mold base 5 does not move to form a mold closing idle period for the bottom mold base 5, and the mold opening and closing mold base continues to close the mold until the wedge-shaped snap ring snaps into the wedge-shaped ring groove.

When the bottom mold base 5 is closed, the second link 13 and the third link 14 both extend in the vertical direction. The bottom mold base 5 can be adjusted by adjusting the length of the second link 13 or the third link 14 'S clamping height. In this embodiment, the bracket 10 is further provided with a limit block 15. When the third link 14 extends in the vertical direction, the limit block 15 is pressed against the side of the third link 14 away from the first link 12. That is, the first link 12 and the limit block 15 are located on different sides of the third link 14. When the third link 14 and the second link 13 are in the mold clamping position, the overshooting motion of the third link 14 is easily formed, and the positioning block 15 can limit the overshooting motion.

The sliding of the bottom mold base 5 on the frame 2 constitutes a sliding pair, and the connections of other components are hinge connections to form a rotating pair or a spherical pair. Therefore, the above-mentioned link mechanism for the linkage of the blowing machine mold base has The low-level mechanism usually has the advantages of simple structure, easy manufacturing, reliable operation, being able to withstand a large load and transmitting large power.

The first swing arm 7, the front holding hand 121, the rear holding hand 122, the third link 14, and the bracket 10 constitute a space five-link mechanism. The first swing arm 7 drives the left mold frame 3 and the right mold frame 4 to gradually open until the wedge-shaped snap ring completely disengages from the wedge-shaped ring groove. The space five-bar linkage mechanism is essentially a space four-bar linkage mechanism, and the bottom mold frame 5 No movement, forming an open mold idle period for the bottom mold base 5; the left mold base 3 and the right mold base 4 are gradually closed by the first swing arm 7, and the return spring 11 drives the bottom mold base 5 to reset, since the wedge-shaped snap ring After being inserted into the wedge-shaped ring groove on the bottom mold base 5 in the mold clamping position and locking the bottom mold base 5, the space five-link mechanism is essentially a space four-link mechanism, and the bottom mold base 5 does not move, forming a target The mold clamping idle period of the bottom mold base 5. Ingeniously using the conversion between the five-bar linkage in the low auxiliary space and the four-bar linkage in the low auxiliary space, the problem of the immovability of the bottom mold frame 5 at the beginning of the left mold frame 3 and the right mold frame 4 opening and near the closing stage is solved.

The following specifically describes the working process of this embodiment:

When the mold is opened, the cam mechanism drives the first swing arm 7 to swing forward, and the first drive mechanism drives the mold opening and closing mold holder to open the mold. Before the wedge-shaped snap ring comes out of the wedge-shaped ring groove, the first link 12 with the connecting mechanism is in In the non-straightened state, the bottom mold base 5 does not move, forming a mold-opening idle period for the bottom mold base 5; after the wedge-shaped snap ring is detached from the wedge-shaped ring groove, the first link 12 with the connecting mechanism is in the straightened state, The cam mechanism drives the first swing arm 7 to continue to swing forward, the mold opening and closing mold base continues to open the mold, and the bottom mold base 5 is simultaneously lowered;

When the mold is closed, the return spring 11 drives the bottom mold base 5 to rise and reset. Before the wedge-shaped snap ring enters the wedge-shaped ring groove, the first connecting rod 12 with the connecting mechanism is in a straightened state, and the first swing arm 7 is synchronized to swing in reverse , Driving the mold opening and closing mold base to synchronously close; the bottom mold base 5 stops closing after the mold is in place, and the cam mechanism drives the first swing arm 7 to continue to swing in reverse. After the wedge-shaped snap ring enters the wedge-shaped ring groove, it has a connecting mechanism The first connecting rod 12 is in an unstraightened state, and the bottom mold base 5 does not move, forming a mold closing idle period for the bottom mold base 5, and the mold opening and closing mold base continues to close the mold until the wedge-shaped snap ring is completely snapped into the wedge-shaped ring In the slot.

The above embodiments are only for explaining the technical concept and features of the present invention, and the purpose thereof is to enable those familiar with the technology to understand and implement the content of the present invention and not to limit the scope of protection of the present invention. The equivalent changes or modifications made in substance should be covered by the protection scope of the present invention.

Claims

A link mechanism used for linkage of the mold frame of the bottle blowing machine is used for linkage of the mold opening and closing mold base and the bottom mold base. The opening and closing mold base includes a left side rotating on a first axis and arranged on the frame A mold base and a right mold base, the bottom mold base is raised and lowered along a bottom mold guide post fixed on the frame, the bottom mold base is provided with a wedge-shaped ring groove, the left mold base and the right Each of the mold frames is provided with a wedge-shaped snap ring for snapping into the wedge-shaped ring groove; the link mechanism includes a second shaft that is rotated on the axis of the shaft and is fixed on one end A first swing arm on the second shaft for driving the rotation of the second shaft, and provided between the second shaft and the mold opening and closing mold holder for rotating the second shaft A first driving mechanism that drives the left mold holder and the right mold holder to cooperate with each other in rotational mold opening or rotational mold clamping, and a cam mechanism for driving the first swing arm to swing, the frame is provided with a The bracket under the bottom mold base; characterized by:

The link mechanism further includes a second drive mechanism and a return spring provided between the bottom mold formwork and the bracket for providing an elastic restoring force that drives the bottom formwork rise;

The second drive mechanism includes a first link hinged at one end to the first swing arm, a second link hinged at one end to the bottom mold form, and a third link hinged at one end to the bracket Rod; the other end of the third link is hinged to the other end of the first link and the other end of the second link; the first link, the second link, the The third connecting rod, one of which has only one connecting rod disconnected therefrom and forms a connecting mechanism with at least one redundant degree of freedom;

The connecting rod with connecting mechanism includes unstraightened state and straightened state;

When the mold is opened, the first swing arm swings forward: Before the wedge-shaped snap ring is detached from the wedge-shaped ring groove, the connecting rod with the connecting mechanism is in an unstraightened state; when the wedge-shaped snap ring is detached from the wedge After the ring groove, the connecting rod with the connecting mechanism is in a straightened state;

When the mold is closed, the bottom mold base rises and resets. Before the wedge-shaped snap ring enters the wedge ring groove, the connecting rod with the connecting mechanism is in a straightened state; the bottom mold base stops rising, and the first A swing arm continues to swing in the reverse direction. After the wedge-shaped snap ring enters the wedge-shaped ring groove, the connecting rod with the connecting mechanism is in an unstraightened state.
The connecting rod mechanism for the linkage of the blowing machine mold frame according to claim 1, wherein: the first connecting rod, the second connecting rod and the third connecting rod, among the three There is and only one connecting rod is disconnected from it at least once, and the connecting mechanism is formed at each disconnection.
The connecting rod mechanism for the linkage of the blowing machine mold frame according to claim 1 or 2, wherein the connecting mechanism is an articulation point with a redundant degree of freedom.
The connecting rod mechanism for the linkage of the blowing machine mold frame according to claim 1 or 2, wherein the connecting mechanism is a flexible connecting member with at least one redundant degree of freedom.
The link mechanism for the linkage of the mold frame of a bottle blowing machine according to claim 1, characterized in that: the first link is disconnected therefrom to form a front holding hand and a rear holding hand, the front holding hand and the rear holding hand Articulate with each other in hand.
The connecting rod mechanism for the linkage of the mold frame of a bottle blowing machine according to claim 1, characterized in that: when the bottom mold frame is clamped in place, the second connecting rod and the third connecting rod Both extend in the vertical direction.
The connecting rod mechanism for the linkage of the blowing machine mold frame according to claim 6, characterized in that: a limit block is further provided on the bracket, and when the third connecting rod extends in the vertical direction, the The limiting block is pressed against the side of the third link away from the first link.
The connecting rod mechanism for the linkage of a blow molding machine mold frame according to claim 1, wherein the first driving mechanism includes a second swing arm fixedly connected to the second shaft, A link of a mold opening and closing mechanism between the second swing arm and the mold opening and closing mold frame.
The connecting rod mechanism for the linkage of the mold frame of a bottle blowing machine according to claim 1, characterized in that the cam mechanism includes a cam rotor provided on the first swing arm for passing the cam The rotor drives the cam guide rail of the first swing arm.