CN112372991A

CN112372991A - Extrusion blow molding machine and method for processing product by using extrusion blow molding machine

Info

Publication number: CN112372991A
Application number: CN202011319400.0A
Authority: CN
Inventors: 陈华卿
Original assignee: Taizhou Xianglong Food Container Technology Co ltd
Current assignee: Taizhou Xianglong Food Container Technology Co ltd
Priority date: 2020-11-23
Filing date: 2020-11-23
Publication date: 2021-02-19
Also published as: WO2022105935A1

Abstract

The invention provides an extrusion blow molding machine and a method for processing a product by using the same, belonging to the technical field of plastic processing. The blow molding machine solves the problem that the existing blow molding machine is not suitable for processing products by partial types of extrusion blow molding dies. The extrusion blow molding machine comprises a rack and two groups of extrusion blow molding die opening and closing devices, wherein each group of extrusion blow molding die opening and closing devices is provided with a set of extrusion blow molding die opening and closing devices which are connected with the rack through a second linear guide assembly; when one set of the extrusion blow molds is in an open state, the other set of the extrusion blow molds is in a closed state, and one set of the extrusion blow mold opening and closing devices moves relative to the other set of the extrusion blow mold opening and closing devices along the guiding direction of the second linear guiding assembly, the extrusion blow molds in the closed state can pass between two half molds in the open extrusion blow molds. The blow molding machine is suitable for processing products by extrusion blow molding dies (application No. 2020103650986).

Description

Extrusion blow molding machine and method for processing product by using extrusion blow molding machine

Technical Field

The invention belongs to the technical field of plastic processing, relates to blow molding, and particularly relates to an extrusion blow molding machine.

The invention belongs to the technical field of plastic processing, relates to blow molding, and particularly relates to a method for processing a product by using an extrusion blow molding machine.

Background

Extrusion blow molding is a process for manufacturing hollow thermoplastic articles such as bottles, pails, cans, cases and containers for packaging food, beverages, cosmetics, pharmaceuticals and commodities.

Many of the related documents relating to extrusion blow molding machines, such as a blow molding machine described in chinese patent document (application No. 201710658468.3); the device comprises a rack, a turntable and a plurality of groups of blow mold opening and closing devices, wherein the plurality of groups of blow mold opening and closing devices are distributed around the axial core line of the turntable in the circumferential direction; each set of blow mold opening and closing device is provided with one set of blow mold, so that the number of blow molds is large, and the equipment is not suitable for small-batch production. Further, the applicant has proposed an extrusion blow mold (application No. 202010365098.6), which has problems that the product processing using the above blow molding machine and the above extrusion blow molding mold has a long debugging time, and the abutting matching between two adjacent molds is not possible, which affects the product yield.

Disclosure of Invention

The invention provides an extrusion blow molding machine, and aims to solve the technical problem of how to provide an extrusion blow molding machine suitable for producing products in small batches.

The invention provides a method for processing a product by using an extrusion blow molding machine, and aims to solve the technical problem of how to provide a method for processing a product by using an extrusion blow molding machine, which is suitable for industrial production.

The technical problem to be solved by the invention can be realized by the following technical scheme: an extrusion blow molding machine comprises a rack and two sets of extrusion blow molding die opening and closing devices, wherein each set of extrusion blow molding die opening and closing device is provided with a set of extrusion blow molding die; the two groups of extrusion blow molding die opening and closing devices are arranged oppositely, and the extrusion blow molding die opening and closing devices are connected with the rack through a second linear guide assembly; when one set of the extrusion blow molds is in an open state, the other set of the extrusion blow molds is in a closed state, and one set of the extrusion blow mold opening and closing devices moves relative to the other set of the extrusion blow mold opening and closing devices along the guiding direction of the second linear guiding assembly, the extrusion blow molds in the closed state can pass between two half molds in the open extrusion blow molds.

The extrusion blow molding machine realizes the up-and-down reciprocating movement of the extrusion blow mold opening and closing device by controlling the two sets of extrusion blow mold opening and closing devices to move along the guide direction of the second linear guide assembly, realizes the reciprocating movement of the extrusion blow mold opening and closing device by controlling the movement of the extrusion blow mold opening and closing device, and can realize the up-and-down alternate arrangement of the two sets of extrusion blow molds by orderly controlling the movement of the two sets of extrusion blow mold opening and closing devices and controlling the movement of the extrusion blow mold opening and closing device, if one set of extrusion blow mold moves downwards and is in a blow molding step, the other set of extrusion blow mold moves upwards and is in a mold opening state.

In the above extrusion blow molding machine, the guide direction of the second linear guide assembly is perpendicular to the mold opening and closing direction of the two half molds of the extrusion blow mold.

In the above extrusion blow molding machine, two sets of driving assemblies including motors are mounted on the frame, and the two sets of driving assemblies are connected with the two sets of extrusion blow mold opening and closing devices in a one-to-one correspondence manner.

In the above extrusion blow molding machine, the driving assembly further comprises a transmission belt, the housing of the motor is fixed on the frame, and the rotating shaft of the motor is connected with the mold opening and closing device of the extrusion blow mold through the transmission belt.

In the extrusion blow molding machine, the rack is provided with the follower wheel, the driving belt is sleeved on the follower wheel, and the driving belt is provided with the auxiliary balancing weight.

In the extrusion blow molding machine, the rack is also provided with two groups of counterweight components, and the two groups of counterweight components are correspondingly connected with the two groups of extrusion blow molding die opening and closing devices one by one.

In the extrusion blow molding machine, the counterweight assembly comprises a counterweight block and a connecting belt, the rack is provided with a roller, the connecting belt is sleeved on the roller, and the connecting belt is connected with the counterweight block and the extrusion blow mold opening and closing device.

In the extrusion blow molding machine, the mold opening and closing device of the extrusion blow molding mold comprises an opening and closing mold base, a sliding base and two opening and closing swing rods, wherein the opening and closing mold base is connected with the rack through a second linear guide assembly; the sliding seat is connected with the opening and closing die holder through a first linear guide assembly, and a driving piece connected with the sliding seat is installed on the opening and closing die holder; the middle part of the opening and closing swing rod is connected with the sliding seat, one end of the opening and closing swing rod is provided with a half-mold mounting seat, a half mold of the extrusion blow molding mold is arranged on the half-mold mounting seat, and the other end of the opening and closing swing rod is rotatably connected with the opening and closing mold seat through a first rotating shaft; when the driving piece drives the sliding seat to move along the guiding direction of the first linear guiding assembly, one end parts of the two opening and closing swing rods are close to or far away from each other. The mold opening and closing device of the extrusion blow molding mold enables one end part of the opening and closing swing rod to swing relative to the other end part, so that the swing amplitude of the half mold mounting seat can be improved, and the distance between two half molds is increased when the extrusion blow molding mold is in an open state; whereby one set of extrusion blow molds in a closed position can pass between two mold halves of another set of extrusion blow molds in an open position.

A method for processing a product by using the extrusion blow molding machine, which is characterized by comprising the following steps in sequence;

firstly, clamping extruded raw materials by a set of extrusion blow molding dies in a closed state, and driving the extrusion blow molding dies in the closed state to move by a driving assembly; the control driving assembly drives the other set of the extrusion blow molding mold in the open state to move, so that the extrusion blow molding mold in the closed state passes through the two half molds in the extrusion blow molding mold in the open state until the raw material is positioned between the two half molds in the extrusion blow molding mold;

secondly, operating a driving piece to switch the extrusion blow molding die from an open state to a closed state; and controlling the driving assembly to drive the other set of extrusion blow molding die to move towards the one set of extrusion blow molding die, so that one end part of the one set of extrusion blow molding die is in butt joint with the other set of extrusion blow molding die.

In the above extrusion blow molding machine, in the first step, the driving unit moves the extrusion blow mold in the closed state to stretch the material.

Compared with the prior art, the extrusion blow molding machine can realize continuous production of products by only two sets of extrusion blow molding dies, the required number of the extrusion blow molding dies is obviously reduced, and the manufacturing cost of the products is further obviously reduced; the extrusion blow molding machine is particularly suitable for the production of small-batch products.

When two sets of extrusion blow molding dies in the extrusion blow molding machine alternately act up and down, one set of extrusion blow molding die in a closed state directly passes through between two half dies in the other set of extrusion blow molding die in an open state, so that the action steps of the extrusion blow molding machine are reduced, the structural compactness of the extrusion blow molding machine is improved, the manufacturing cost of the extrusion blow molding machine is reduced, and the operation stability of the extrusion blow molding machine is improved.

When the two sets of extrusion blow molding dies in the extrusion blow molding machine alternately move up and down, the moving speeds of the two sets of extrusion blow molding die opening and closing devices can be separately controlled, and the two sets of extrusion blow molding dies can be more tightly butted end to end in combination with the time length of the extrusion blow molding dies for opening and closing the dies, so that the butting efficiency is higher, and the production efficiency and the product qualification rate of products are further improved.

Drawings

Fig. 1 and 2 are schematic perspective views of an extrusion blow molding machine in different states.

Fig. 3 is a schematic perspective view of the open/close device of the extrusion blow mold in a closed state of the extrusion blow mold.

Fig. 4 is a schematic bottom view of the mold opening and closing device for the extrusion blow mold with the extrusion blow mold in a closed state.

Fig. 5 is a schematic perspective view of the open/close device of the extrusion blow mold in the open state of the extrusion blow mold.

Fig. 6 is a schematic bottom view of the open/close device of the extrusion blow mold with the extrusion blow mold in an open state.

In the figure, 1, a frame; 2. an extrusion blow mold; 2a, a half mold; 2b, a gas injection mechanism; 3. an extrusion blow mold opening and closing mold device; 3a, opening and closing the die holder; 3b, a sliding seat; 3c, opening and closing the swing rod; 3d, a first linear guide assembly; 3e, a driving member; 3f, a first rotating shaft; 3g, connecting rods; 3h, a second rotating shaft; 3i, a third rotating shaft; 3j, a half-mold mounting seat; 3k, a fifth rotating shaft; 4. a second linear guide assembly; 5. a drive assembly; 5a, a motor; 5b, a transmission belt; 5c, a follow-up wheel; 5d, driving wheels; 6. a counterweight assembly; 6a, a balancing weight; 6b, connecting bands; 6c, rollers; 7. an extrusion head; 8. raw materials; 9. auxiliary balancing weight.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

The first embodiment is as follows: as shown in fig. 1 and 2, an extrusion blow molding machine includes a frame 1 and two sets of extrusion blow mold opening and closing devices 3, the two sets of extrusion blow mold opening and closing devices 3 being disposed opposite to each other; each set of extrusion blow molding die opening and closing device 3 is provided with a set of extrusion blow molding die 2.

As shown in fig. 3 to 6, an opening and closing mold device 3 for an extrusion blow mold includes an opening and closing mold base 3a, a slide base 3b, and two opening and closing swing levers 3 c.

Both sides of the sliding seat 3b are connected with the opening and closing die holder 3a through the first linear guide assembly 3d, so that the bearing capacity of the sliding seat 3b is improved, and the motion stability of the sliding seat 3b is improved. The guide direction of the first linear guide unit 3d is the horizontal direction, whereby the slide base 3b can be horizontally moved along the guide direction of the first linear guide unit 3 d.

A driving piece 3e connected with the sliding seat 3b is arranged on the opening and closing die holder 3 a; the driving part 3e is an oil cylinder or an air cylinder, the cylinder body is rotatably connected with the opening and closing die holder 3a, and the piston rod is rotatably connected with the sliding seat 3b, so that the installation precision of the driving part 3e can be reduced, and the sliding flexibility and stability of the sliding seat 3b can be ensured.

One end part of the opening and closing swing rod 3c is rotatably connected with the opening and closing die holder 3a through a first rotating shaft 3 f; the two opening and closing swing rods 3c share the first rotating shaft 3f, so that the structure compactness of the extrusion blow molding mold opening and closing device 3 can be improved, and the manufacturing cost is reduced.

The middle part of the opening and closing swing rod 3c is connected with the sliding seat 3b, a connecting rod 3g is arranged between the opening and closing swing rod 3c and the sliding seat 3b, one end of the connecting rod 3g is rotatably connected with the opening and closing swing rod 3c through a second rotating shaft 3h, and the other end of the connecting rod 3g is rotatably connected with the sliding seat 3b through a third rotating shaft 3 i. When the sliding seat 3b moves, the sliding seat 3b drives the connecting rod 3g to move, and the connecting rod 3g drives the opening and closing swing rod 3c to swing around the first rotating shaft 3 f; therefore, the structure not only ensures that the sliding seat 3b can drive the opening and closing swing rod 3c to swing when moving, but also accords with the lever characteristic, has the boosting function, and can reduce the output acting force of the driving piece 3e when ensuring the mold clamping force of the extrusion blow mold 2.

The two opening and closing swing rods 3c are positioned between the two groups of first linear guide assemblies 3d, the opening and closing swing rods 3c are bent, the two opening and closing swing rods 3c are oppositely arranged, and the maximum distance between the other ends of the two opening and closing swing rods 3c can be controlled by controlling the bending angle and the length of the opening and closing swing rods 3 c.

And a half-mold mounting seat 3j is mounted at the other end of the opening and closing swing rod 3c, and the half mold mounting seat 3j is used for mounting a half mold 2a of the extrusion blow molding mold 2. The half-mold mounting seat 3j is rotatably connected with the opening and closing swing rod 3c through a fifth rotating shaft 3 k. The extrusion blow molding mold opening and closing device 3 further comprises an elastic part which can enable the half mold mounting seat 3j to reset, the elastic part is a torsion spring, the torsion spring is sleeved on the fifth rotating shaft 3k, one end of the torsion spring is connected with the opening and closing swing rod 3c, and the other end of the torsion spring is connected with the half mold mounting seat 3 j. According to actual conditions, the spring part can also adopt a tension spring, one end of the tension spring is connected with the opening and closing swing rod 3c, and the other end of the tension spring is connected with the half-mold mounting seat 3 j.

The first rotating shaft 3f is positioned between the half-mold mounting seat 3j and the sliding seat 3b, and the sliding seat 3b is positioned between the opening and closing swing rod 3c and the driving part 3 e; the arrangement structure has the advantages of reasonable arrangement, simple structure and large space between the two half mold installation seats 3j, and the space satisfies the installation of the extrusion blow molding mold 2 and the condition that one group of the extrusion blow molding molds 2 in the closed state can pass through between the two half molds 2a in the other group of the extrusion blow molding molds 2 in the open state.

The extrusion blow molding die 2 comprises two half dies 2a and a group of gas injection mechanisms 2b, wherein the two half dies 2a and two half die mounting seats 3j are correspondingly mounted one by one; the gas injection mechanism 2b is mounted on a first rotating shaft 3f, and the gas injection mechanism 2b can rotate with one of the mold halves 2 a. The function and advantages of the various components are further illustrated by illustrating the mold opening and closing process of the extrusion blow mold 2. As shown in fig. 3 and 4, the piston rod of the driver 3e is in an extended state, and the extrusion blow mold 2 is in a mold clamping state; as shown in fig. 5 and 6, the piston rod of the driver 3e is in a retracted state and the extrusion blow mold 2 is in an open state.

When the piston rod of the driving element 3e gradually extends out from the retraction state, the driving element 3e pushes the sliding seat 3b to move horizontally to the front along the guiding direction of the first linear guiding component 3 d; the sliding seat 3b pushes the two connecting rods 3g to synchronously move and swing, the connecting rods 3g push the opening and closing swing rods 3c to rotate around the first rotating shaft 3f, the two opening and closing swing rods 3c synchronously swing in opposite directions, and the distance between the other ends of the two opening and closing swing rods 3c is gradually reduced; the opening and closing swing rod 3c drives the half-mold mounting seat 3j and the half mold 2a of the extrusion blow molding mold 2 to swing, so that the two half molds 2a of the extrusion blow molding mold 2 are gradually closed to realize mold closing, the distance between the extrusion blow molding mold 2 and the opening and closing mold seat 3a is increased, and the extrusion blow molding mold 2 extends out of the opening and closing mold seat 3a to facilitate product processing.

When the piston rod of the driving element 3e is gradually retracted from the extending state, the driving element 3e pulls the sliding seat 3b to move horizontally backwards along the guiding direction of the first linear guiding component 3 d; the sliding seat 3b pulls the two connecting rods 3g to synchronously move and swing, the connecting rods 3g pull the opening and closing swing rods 3c to rotate around the first rotating shaft 3f, and the two opening and closing swing rods 3c synchronously swing in opposite directions; the opening and closing swing rods 3c drive the half-mold mounting seat 3j and the half mold 2a of the extrusion blow molding mold 2 to swing, and the distance between the other ends of the two opening and closing swing rods 3c is gradually increased; thus, the space between the two half moulds 2a of the extrusion blow moulding mould 2 is gradually increased, and the mould opening is realized; and the distance between the extrusion blow molding die 2 and the opening and closing die holder 3a is reduced, and the extrusion blow molding die 2 is partially contracted to the opening and closing die holder 3a, so that the distance between the two half dies 2a is increased, the occupied volume is reduced, and the interference caused by the movement of the two sets of extrusion blow molding dies 2 is avoided.

The mold opening and closing device 3 for the extrusion blow molding mold can also reduce the overhanging size of the extrusion blow molding mold 2, thereby improving the installation stability of the extrusion blow molding mold 2 and improving the up-and-down butt joint goodness of fit of the two sets of extrusion blow molding molds 2. The structure of the mold opening and closing device 3 of the extrusion blow mold can lead the extrusion blow mold 2 to extend or retract, thus reducing the distance between the two groups of mold opening and closing devices 3 of the extrusion blow mold and further improving the structural compactness of the extrusion blow molding machine.

The left side and the right side of an opening and closing die holder 3a in the extrusion blow molding die opening and closing device 3 are connected through a second linear guide assembly 4; this improves the load-bearing capacity and stability of the mold opening and closing device 3 for the extrusion blow mold. The second linear guide assembly 4 is guided in a vertical direction, so that the mold opening and closing device 3 for the extrusion blow mold can be moved up and down along the direction guided by the second linear guide assembly 4. The axis of the first rotating shaft 3f is vertically arranged, so that the two half molds 2a of the extrusion blow molding mold 2 are horizontally opened and closed, and the raw material 8 in a vertical state can be extruded, thereby being beneficial to improving the quality of products.

Two groups of driving components 5 are installed on the frame 1, and the two groups of driving components 5 are correspondingly connected with the two groups of extrusion blow molding mold opening and closing devices 3 one by one. The driving assembly 5 comprises a motor 5a and a transmission belt 5b, a shell of the motor 5a is fixed on the rack 1, and the transmission belt 5b is connected with an opening and closing die holder 3a of the extrusion blow molding die opening and closing device 3; a follower wheel 5c connected with the transmission belt 5b is arranged on the frame 1, and a driving wheel 5d connected with the transmission belt 5b is fixed on the rotating shaft of the motor 5 a. The lifting or descending of the mold opening and closing device 3 of the extrusion blow mold and the adjustment of the lifting speed can be controlled by controlling the rotating direction and the rotating speed of the motor 5 a; the speed of the upper and lower sets of extrusion blow molding dies 2 can be controlled respectively, the speed can be adjusted flexibly according to actual conditions, and the head-to-tail butt joint directionality between the upper and lower sets of extrusion blow molding dies 2 is improved remarkably. The rotating speed regulating range of the motor 5a is wide, the precision is high, and the descending speed of the blow mold opening and closing device can be guaranteed to be the same as the plastic extrusion speed or higher than the plastic extrusion speed.

Two groups of counterweight components 6 are also arranged on the frame 1, and the two groups of counterweight components 6 are correspondingly connected with the two groups of extrusion blow molding die opening and closing devices 3 one by one. The counterweight assembly 6 comprises a counterweight block 6a and a connecting belt 6b, a roller 6c is installed on the rack 1, the connecting belt 6b is sleeved on the roller 6c, and the connecting belt 6b is connected with the counterweight block 6a and an opening and closing die holder 3a of the extrusion blow molding die opening and closing device 3. The driving belt 5b is provided with an auxiliary balancing weight 9. The counterweight block 6a and the auxiliary counterweight block 9 with proper weight are selected according to the gravity of the extrusion blow molding die opening and closing device 3 and the extrusion blow molding die 2, so that the load of the motor 5a is obviously reduced, the speed regulation and control precision is improved, and the lifting flexibility and stability of the extrusion blow molding die opening and closing device 3 are also improved.

The transmission belt 5b has slight elasticity which is objective, and the transition rotation of the motor 5a is controlled, so that the complete fitting of the upper and lower extrusion blow molding dies 2 is ensured, a certain pressure is generated between the upper and lower extrusion blow molding dies 2, and the end-to-end butt joint inosculation of the upper and lower extrusion blow molding dies 2 is obviously improved.

When a product is processed by the extrusion blow molding machine, the extrusion head 7 is positioned right above the extrusion blow molding machine, and the raw material 8 extruded from the extrusion head 7 naturally moves vertically downward. The driving component 5 drives the extrusion blow molding die opening and closing device 3 to reciprocate downwards and upwards; the extrusion blow mold 2 is in a mold closing state in the downward process; in the upward process the extrusion blow mould 2 is in the open position.

The function and advantages of the various components are further illustrated by illustrating several specific processes for processing a product using an extrusion blow molding machine. For convenience of description, the two sets of the extrusion blow mold opening and closing device 3 are respectively referred to as a first extrusion blow mold opening and closing device 3 and a second extrusion blow mold opening and closing device 3; the extrusion blow mold 2 attached to the first extrusion blow mold opening and closing device 3 is referred to as a first extrusion blow mold 2, and the extrusion blow mold 2 attached to the second extrusion blow mold opening and closing device 3 is referred to as a second extrusion blow mold 2; the drive assembly 5 connected to the first extrusion blow mold opening and closing device 3 is referred to as a first drive assembly 5, and the drive assembly 5 connected to the second extrusion blow mold opening and closing device 3 is referred to as a second drive assembly 5.

As shown in fig. 1, the first extrusion blow mold 2 is positioned above the second extrusion blow mold 2, the first extrusion blow mold 2 is in a mold closed state, and the second extrusion blow mold 2 is in an open state. In this state, it is suitable to blow the material 8 in the first extrusion blow mold 2 and further blow mold the material 8 in the first extrusion blow mold 2 into a product. In the blow molding process of the first extrusion blow molding die 2, a motor 5a in the first driving component 5 needs to be controlled to rotate, so that the first driving component 5 drives the first extrusion blow molding die opening and closing device 3 to continuously move downwards; in the process, the second driving assembly 5 drives the second extrusion blow mold opening and closing device 3 to move upwards, and the first extrusion blow mold 2 passes between the two half molds 2a in the second extrusion blow mold 2; the first extrusion blow mold opening and closing device 3 is typically moved downward at the same rate that the extrusion head 7 extrudes the feedstock 8.

The first extrusion blow mold opening and closing device 3 moves downward, and the second extrusion blow mold opening and closing device 3 moves upward, so that the state shown in fig. 2 can be achieved; the second extrusion blow mold 2 is located above the first extrusion blow mold 2.

When the blow molding machine is in the state shown in fig. 2, the upper end portion of the first extrusion blow mold 2 is abutted against the lower end portion of the second extrusion blow mold 2 and the second extrusion blow mold 2 is clamped by operating the second drive unit 5 and the drive member 3e of the second extrusion blow mold opening and closing device 3. Before the two half molds 2a in the second extrusion blow mold 2 are closed, the downward moving speed of the first extrusion blow mold opening and closing device 3 is made to be higher than the same speed of extruding the raw material 8 by the extrusion head 7 by controlling the rotating speed of the motor 5a in the first driving assembly 5; the extruded material 8 is thereby stretched axially, which facilitates the reshaping of the molecular chains of the material 8 and improves the properties of the material, in particular the transparency.

After first extrusion blow molding mould 2 and second extrusion blow molding mould 2 are all in the compound die state, control the rotation of motor 5a in the second drive assembly 5, realize that second drive assembly 5 drives second extrusion blow molding mould mold opening and closing device 3 and continues the downstream, be fit for in this process carrying out the blow molding to raw materials 8 in the second extrusion blow molding mould 2, and then make in the second extrusion blow molding mould 2 raw materials 8 by blow molding for the product. In the process, the rotating speed of the motor 5a in the first driving assembly 5 is also increased, so that the downward moving speed of the first extrusion blow molding die opening and closing device 3 is greater than the downward moving speed of the second extrusion blow molding die opening and closing device 3; thereby, the first extrusion blow mold 2 is separated from the second extrusion blow mold 2, and the raw material 8 in the first extrusion blow mold 2 is pulled apart from the raw material 8 in the second extrusion blow mold 2.

After the first extrusion blow mold 2 is separated from the second extrusion blow mold 2, the driving member 3e of the first extrusion blow mold opening and closing device 3 is operated to open the first extrusion blow mold 2 and drop the product in the first extrusion blow mold 2.

Example two: the structure and principle of the present embodiment are substantially the same as those of the first embodiment, and the substantially same parts are not described redundantly, but only different parts are described, and the different parts are: the middle part of the opening and closing swing rod 3c is connected with the sliding seat 3b through a fourth rotating shaft, and the shaft hole of the sliding seat 3b is in a strip shape. When the sliding seat 3b moves, the sliding seat 3b drives the fourth rotating shaft to move, and the fourth rotating shaft drives the opening and closing swing rod 3c to swing around the first rotating shaft 3 f; in this process, the fourth rotating shaft moves along the side wall of the shaft hole.

Claims

1. An extrusion blow molding machine comprises a rack and is characterized by further comprising two sets of extrusion blow molding die opening and closing devices (3), wherein each set of extrusion blow molding die opening and closing device (3) is provided with a set of extrusion blow molding die (2); the two groups of extrusion blow molding die opening and closing devices (3) are arranged oppositely, and the extrusion blow molding die opening and closing devices (3) are connected with the rack through a second linear guide assembly (4); when one set of the extrusion blow molding dies (2) is in an open state, the other set of the extrusion blow molding dies (2) is in a closed state, and one set of the extrusion blow molding die opening and closing device (3) moves relative to the other set of the extrusion blow molding die opening and closing device (3) along the guiding direction of the second linear guiding component (4), the extrusion blow molding dies (2) in the closed state can pass between two half dies (2 a) in the open state of the extrusion blow molding dies (2).

2. An extrusion blow mold opening and closing device according to claim 1, characterized in that the guiding direction of the second linear guiding assembly (4) is arranged perpendicular to the mold opening and closing direction of the two mold halves (2 a) of the extrusion blow mold (2).

3. The device for opening and closing the extrusion blow mold according to claim 1, wherein two sets of counterweight assemblies (6) are further mounted on the frame (1), and the two sets of counterweight assemblies (6) are connected with the two sets of the device for opening and closing the extrusion blow mold (3) in a one-to-one correspondence manner.

4. The mold opening and closing device for the extrusion blow mold according to claim 3, wherein the counterweight assembly (6) comprises a counterweight (6 a) and a connecting belt (6 b), a roller (6 c) is installed on the frame (1), the connecting belt (6 b) is sleeved on the roller (6 c), and the connecting belt (6 b) is connected with the counterweight (6 a) and the mold opening and closing device (3) for the extrusion blow mold.

5. The device according to claim 1, wherein the device comprises an opening and closing mold base (3 a), a sliding base (3 b) and two opening and closing swing rods (3 c), wherein the opening and closing mold base (3 a) is connected with the frame through a second linear guide assembly (4); the sliding seat (3 b) is connected with the opening and closing die holder (3 a) through a first linear guide component (3 d), and a driving part (3 e) connected with the sliding seat (3 b) is installed on the opening and closing die holder (3 a); the middle part of the opening and closing swing rod (3 c) is connected with the sliding seat (3 b), one end of the opening and closing swing rod (3 c) is provided with a half-mold mounting seat (3 j), a half mold (2 a) of the extrusion blow molding mold (2) is arranged on the half-mold mounting seat (3 j), and the other end of the opening and closing swing rod (3 c) is rotatably connected with the opening and closing mold seat (3 a) through a first rotating shaft (3 f); when the driving piece (3 e) drives the sliding seat (3 b) to move along the guiding direction of the first linear guiding component (3 d), one end parts of the two opening and closing swing rods (3 c) are close to or far away from each other.

6. The extrusion blow mold opening and closing device according to any one of claims 1 to 5, characterized in that two sets of driving assemblies (5) comprising motors (5 a) are mounted on the frame (1), and the two sets of driving assemblies (5) are connected with the two sets of extrusion blow mold opening and closing devices (3) in a one-to-one correspondence.

7. The device according to claim 6, characterized in that the drive unit (5) further comprises a belt (5 b), the housing of the motor (5 a) is fixed on the frame (1), and the rotating shaft of the motor (5 a) is connected with the device (3) through the belt (5 b).

8. The device for opening and closing the extrusion blow molding die according to claim 7, wherein the machine frame (1) is provided with a follower wheel (5 c), the transmission belt (5 b) is sleeved on the follower wheel (5 c), and the transmission belt (5 b) is provided with an auxiliary balancing weight.

9. A method of processing a product using the extrusion blow molding machine of claim 6, 7 or 8, characterized in that the method of processing a product using the extrusion blow molding machine comprises the following sequential steps;

firstly, a set of extrusion blow molding dies (2) in a closed state clamps an extrusion raw material, and a driving assembly (5) drives the extrusion blow molding dies (2) in the closed state to move; the control driving assembly (5) drives the other set of the extrusion blow molding mold (2) in the open state to move, so that the extrusion blow molding mold (2) in the closed state passes through the space between the two half molds (2 a) in the extrusion blow molding mold (2) in the open state until the two half molds (2 a) in the extrusion blow molding mold (2) in the open state are positioned at two sides of the raw materials;

secondly, operating the driving piece (3 e) to switch the extrusion blow molding die (2) from an open state to a closed state; and controlling the driving component (5) to drive the other set of extrusion blow molding die (2) to move towards the one set of extrusion blow molding die (2), so that one end part of the one set of extrusion blow molding die (2) is butted with the other set of extrusion blow molding die (2).

10. Method for processing a product with an extrusion blow-moulding machine according to claim 9, characterised in that in the first step the extrusion blow-moulding die (2) stretches the material while the drive assembly (5) moves the extrusion blow-moulding die (2) in the closed position.