Extrusion blow molding mold opening and closing device and extrusion blow molding machine

Abstract

The present invention provides an extrusion blow molding mold opening and closing device and an extrusion blow molding machine, belonging to the field of plastic processing technology. It solves the problem that the existing extrusion blow molding mold opening and closing device types are insufficient. The extrusion blow molding mold opening and closing device includes an opening and closing mold base, a sliding base and two opening and closing swing rods. The sliding base is connected to the opening and closing mold base through a first linear guide assembly, and a driving member connected to the sliding base is installed on the opening and closing mold base; the middle part of the opening and closing swing rod is connected to the sliding base, and a half mold mounting seat is installed at one end of the opening and closing swing rod. The half mold of the extrusion blow molding mold can be mounted on the half mold mounting seat, and the other end of the opening and closing swing rod is rotatably connected to the opening and closing mold base through a first rotating shaft; when the driving member drives the sliding base to move along the guiding direction of the first linear guide assembly, one end of the two opening and closing swing rods approaches or moves away from each other. The extrusion blow molding mold opening and closing device can increase the swing amplitude of the half mold mounting seat and increase the distance between the two half molds.

Description

Technical Field

[0001] The invention belongs to the technical field of plastic processing and relates to a blow molding, in particular to an extrusion blow molding mold opening and closing device.

[0002] The invention belongs to the technical field of plastic processing and relates to a blow molding machine, in particular to an extrusion blow molding machine. Background Art

[0003] Extrusion blow molding is a method for manufacturing hollow thermoplastic parts. Blow molding objects include bottles, barrels, cans, boxes, and containers for packaging food, beverages, cosmetics, medicines, and daily necessities. The extrusion blow molding mold is one of the important components of blow molding, and there is a parison in the extrusion blow molding mold. The extrusion blow molding mold has two half molds, usually both half molds are installed on a set of linear guide rails, and the mold is opened and closed by moving the half mold. There are many related literatures on the opening and closing of extrusion blow molds, such as blow mold opening and closing device and blow molding machine (application number 201710658425.5), blow molding machine (application number 201710658468.3).

[0004] The applicant has proposed an extrusion blow molding mold (application number 202010365098.6). Using an extrusion blow molding mold to process blow molded products can reduce the weight proportion of flash in blow-molded parts and reduce the manufacturing cost of containers. When using a blow molding machine (application number 201710658468.3) for production, there are the following shortcomings: 1. A large number of extrusion blow molding molds are required, which will increase the manufacturing cost of products when produced in small batches; 2. Due to the synchronous rotation linkage between the extrusion blow molding molds, the movement speed of the extrusion blow molding mold is only controlled by the shape of the guide groove. Since the shape of the guide groove is fixed, it is not conducive to adjusting the speed of the extrusion blow molding mold. In actual production, it is difficult to ensure that all two adjacent sets of extrusion blow molding molds can be docked head to tail and ensure docking fit; if the required technical requirements need to be met, there are also problems with high precision requirements for blow molding machines and long debugging time; if the required technical requirements cannot be met, some products cannot meet the required technical requirements, that is, there is a problem of low product qualification rate. Summary of the invention

[0005] The present invention proposes an extrusion blow molding mold opening and closing device. The technical problem to be solved by the present invention is how to propose another extrusion blow molding mold opening and closing device, preferably one that can make it easier to connect the ends of two adjacent sets of extrusion blow molding molds and improve the connection fit.

[0006] The present invention proposes an extrusion blow molding machine. The technical problem to be solved by the present invention is how to propose another extrusion blow molding machine, preferably one that can make it easier to connect the ends of two adjacent sets of extrusion blow molding molds and improve the connection fit.

[0007] The technical problem to be solved by the present invention can be achieved through the following technical solutions: an extrusion blow molding mold opening and closing device includes an opening and closing mold base, a sliding seat and two opening and closing rocker arms, the sliding seat and the opening and closing mold base are connected by a first linear guide assembly, and a driving member connected to the sliding seat is installed on the opening and closing mold base; the middle part of the opening and closing rocker arm is connected to the sliding seat, and a half-mold mounting seat is installed at one end of the opening and closing rocker arm, and the half-mold of the extrusion blow molding mold can be mounted on the half-mold mounting seat, and the other end of the opening and closing rocker arm is rotatably connected to the opening and closing mold base by a first rotating shaft; when the driving member drives the sliding seat to move along the guide direction of the first linear guide assembly, one end of the two opening and closing rocker arms approaches or moves away from each other.

[0008] A half mold mounting seat is installed on each of the two opening and closing swing rods, so the number of the half mold mounting seats is two; the two half molds of the extrusion blow molding mold are installed in a one-to-one correspondence with the two half mold mounting seats. When the driving member in the extrusion blow molding mold opening and closing device drives the sliding seat to move, the sliding seat drives the opening and closing swing rod to swing around the first rotating shaft, so that the half mold and the half mold mounting seat are equivalent to swinging around the first rotating shaft, so that the two half molds are opened or closed.

[0009] In the above-mentioned extrusion blow mold opening and closing device, the first rotating shaft is located between the half-mold mounting seat and the sliding seat, and the sliding seat is located between the opening and closing rocker and the driving member.

[0010] In the above-mentioned extrusion blow mold opening and closing device, the driving member is an oil cylinder or an air cylinder, the cylinder body is rotatably connected to the opening and closing mold base, and the piston rod is also rotatably connected to the sliding base.

[0011] In the above-mentioned extrusion blow mold opening and closing device, the two opening and closing swing arms share a first rotating shaft.

[0012] In the above-mentioned extrusion blow molding mold opening and closing device, a connecting rod is provided between the opening and closing rocker arm and the sliding seat, one end of the connecting rod is rotationally connected to the opening and closing rocker arm through a second rotating shaft, and the other end of the connecting rod is rotationally connected to the sliding seat through a third rotating shaft; or the opening and closing rocker arm and the sliding seat are connected through a fourth rotating shaft, and the axial hole of the sliding seat is strip-shaped.

[0013] In the above-mentioned extrusion blow mold opening and closing device, the opening and closing swing rod is bent, and the two opening and closing swing rods are arranged opposite to each other.

[0014] In the above-mentioned extrusion blow mold opening and closing device, the half-mold mounting seat and the opening and closing swing arm are rotationally connected via a fifth rotating shaft.

[0015] In the above-mentioned extrusion blow mould opening and closing device, the extrusion blow mould opening and closing device also includes an elastic member capable of resetting the half mould mounting seat.

[0016] An extrusion blow molding machine comprises a frame and two groups of the above-mentioned extrusion blow mold opening and closing devices, each group of extrusion blow mold opening and closing devices is equipped with a set of extrusion blow molds; the two groups of extrusion blow mold opening and closing devices are arranged opposite to each other, and the opening and closing mold bases are connected to the frame through a second linear guide component; when one set of extrusion blow molds is in an open state and the other set of extrusion blow molds is in a closed state, and one group of extrusion blow mold opening and closing devices moves relative to the other group of extrusion blow mold opening and closing devices along the guiding direction of the second linear guide component, the extrusion blow mold in the closed state can pass between the two half molds of the extrusion blow mold in the open state.

[0017] The extrusion blow molding machine can realize the upper and lower alternating arrangement of the two sets of extrusion blow molds by controlling the opening and closing mold devices of the two sets of extrusion blow molds to move along the guiding direction of the second linear guide component and controlling the action of the driving member, such as one set of extrusion blow molds is in the blow molding step and the other set of extrusion blow molds is in the product demoulding step.

[0018] Compared with the prior art, the extrusion blow mold opening and closing device enables one end of the opening and closing rocker arm to swing relative to the other end, thereby increasing the swing amplitude of the half-mold mounting seat, thereby increasing the distance between the two half-molds when the extrusion blow mold is in an open state; thereby, one set of extrusion blow molds in a closed state can pass between the two half-molds of another set of extrusion blow molds in an open state.

[0019] Compared with the prior art, the extrusion blow molding machine only needs two sets of extrusion blow molding molds to realize continuous production of products, and the number of extrusion blow molding molds required is significantly reduced, thereby significantly reducing product manufacturing costs; the extrusion blow molding machine is particularly suitable for the production of small batches of products.

[0020] When two sets of extrusion blow molding molds in the extrusion blow molding machine move up and down alternately, one set of extrusion blow molding molds in a closed state directly passes between two half molds of the other set of extrusion blow molding molds in an open state, thereby reducing the action steps of the extrusion blow molding machine, improving the compactness of the structure of the extrusion blow molding machine, reducing the manufacturing cost of the extrusion blow molding machine and improving the operating stability of the extrusion blow molding machine.

[0021] When the two sets of extrusion blow molding molds in the extrusion blow molding machine move up and down alternately, the moving speeds of the opening and closing devices of the two sets of extrusion blow molds can be controlled separately. Combined with the opening and closing time of the extrusion blow molds, the two sets of extrusion blow molds can be more closely butted end to end, with higher butt-jointing efficiency, thereby improving product production efficiency and product qualification rate.

[0022] In the above-mentioned extrusion blow molding machine, two sets of driving components including motors are installed on the frame, and the two sets of driving components are connected to two sets of extrusion blow molding mold opening and closing devices in a one-to-one correspondence. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structural schematic diagram of an extrusion blow mold in a mold closing state on an extrusion blow mold opening and closing device.

[0024] Figure 2 It is a schematic diagram of the structure of the extrusion blow mold in a mold closing state when viewed from above on an extrusion blow mold opening and closing device.

[0025] Figure 3 It is a three-dimensional structural schematic diagram of an extrusion blow mold in an open mold state on an extrusion blow mold opening and closing device.

[0026] Figure 4 It is a schematic diagram of the structure of an extrusion blow mold in an open mold state on an extrusion blow mold opening and closing device, viewed from above.

[0027] Figure 5 and Figure 6 It is a three-dimensional structural schematic diagram of the extrusion blow molding machine in different states.

[0028] In the figure, 1, frame; 2, extrusion blow molding mold; 2a, half mold; 2b, air injection mechanism; 3, extrusion blow molding opening and closing device; 3a, opening and closing mold seat; 3b, sliding seat; 3c, opening and closing swing rod; 3d, first linear guide assembly; 3e, driving member; 3f, first rotating shaft; 3g, connecting rod; 3h, second rotating shaft; 3i, third rotating shaft; 3j, half mold mounting seat; 3k, fifth rotating shaft; 4, second linear guide assembly; 5, driving assembly; 5a, motor; 5b, transmission belt; 5c, follower wheel; 5d, driving wheel; 6, counterweight assembly; 6a, counterweight block; 6b, connecting belt; 6c, roller; 7, extrusion head; 8, raw material. DETAILED DESCRIPTION

[0029] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0030] Embodiment 1: Figures 1 to 4 As shown, an extrusion blow molding mold opening and closing device 3 includes an opening and closing mold base 3a, a sliding base 3b and two opening and closing swing rods 3c.

[0031] The two sides of the sliding seat 3b are connected to the opening and closing mold seat 3a through the first linear guide assembly 3d, thereby improving the bearing capacity of the sliding seat 3b and improving the movement stability of the sliding seat 3b. The guiding direction of the first linear guide assembly 3d is horizontal, so that the sliding seat 3b can move horizontally along the guiding direction of the first linear guide assembly 3d.

[0032] A driving member 3e connected to the sliding seat 3b is installed on the opening and closing mold base 3a; the driving member 3e is an oil cylinder or an air cylinder, and the cylinder body is rotationally connected to the opening and closing mold base 3a, and the piston rod and the sliding seat 3b are also rotationally connected. This can reduce the installation accuracy of the driving member 3e and ensure the sliding flexibility and stability of the sliding seat 3b.

[0033] One end of the opening and closing swing rod 3c is rotatably connected to the opening and closing mold base 3a through a first rotating shaft 3f; the two opening and closing swing rods 3c share a first rotating shaft 3f, which can improve the compactness of the structure of the extrusion blow mold opening and closing device 3 and reduce the manufacturing cost.

[0034] The middle part of the opening and closing swing rod 3c is connected to the sliding seat 3b. The attached figure of the specification shows that 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 to the opening and closing swing rod 3c through the second rotating shaft 3h, and the other end of the connecting rod 3g is rotatably connected to the sliding seat 3b through the third rotating shaft 3i. 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 3f; it can be seen that this structure not only ensures that the opening and closing swing rod 3c can be driven to swing when the sliding seat 3b moves, but also conforms to the lever characteristics and has a force-increasing effect, and can reduce the output force of the driving member 3e when ensuring the clamping force of the extrusion blow molding mold 2.

[0035] The two opening and closing swing rods 3c are located between the two groups of first linear guide components 3d. The opening and closing swing rods 3c are bent and arranged opposite to each other. 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 3c.

[0036] The other end of the opening and closing swing rod 3c is equipped with a half-mold mounting seat 3j, and the half-mold mounting seat 3j is used to mount the half-mold 2a of the extrusion blow molding mold 2. The half-mold mounting seat 3j is rotatably connected to the opening and closing swing rod 3c through the fifth rotating shaft 3k. The extrusion blow molding mold opening and closing device 3 also includes an elastic member that can reset the half-mold mounting seat 3j. The elastic member is a torsion spring, which is sleeved on the fifth rotating shaft 3k. One end of the torsion spring is connected to the opening and closing swing rod 3c, and the other end of the torsion spring is connected to the half-mold mounting seat 3j. According to actual conditions, the spring member can also be a tension spring, one end of the tension spring is connected to the opening and closing swing rod 3c, and the other end of the tension spring is connected to the half-mold mounting seat 3j.

[0037] The first rotating shaft 3f is located between the half-mold mounting seat 3j and the sliding seat 3b, and the sliding seat 3b is located between the opening and closing rocker arm 3c and the driving member 3e; this arrangement structure has a reasonable arrangement, a simple structure, and a large space between the two half-mold mounting seats 3j. The above space meets the requirements of the installation of the extrusion blow molding mold 2 and the passage of one group of extrusion blow molding molds 2 in a closed state between the two half-molds 2a in another group of extrusion blow molding molds 2 in an open state.

[0038] The extrusion blow molding mold 2 includes two half molds 2a and a set of gas injection mechanisms 2b. The two half molds 2a and two half mold mounting seats 3j are mounted one by one. The gas injection mechanisms 2b are mounted on the first rotating shaft 3f, and the gas injection mechanisms 2b can rotate with one of the half molds 2a. By describing the opening and closing process of the extrusion blow molding mold 2, the functions and advantages of each component are further explained. Figure 1 and Figure 2 As shown, the piston rod of the driving member 3e is in an extended state, and the extrusion blow molding mold 2 is in a closed mold state; Figure 3 and Figure 4 As shown, the piston rod of the driving member 3e is in a retracted state, and the extrusion blow mold 2 is in an open mold state.

[0039] When the piston rod of the driving member 3e gradually extends out from the retracted state, the driving member 3e pushes the sliding seat 3b to move horizontally forward along the guiding direction of the first linear guide component 3d; the sliding seat 3b pushes the two connecting rods 3g to move and swing synchronously, and the connecting rod 3g pushes the opening and closing swing rod 3c to rotate around the first rotating shaft 3f, and the two opening and closing swing rods 3c swing synchronously and in opposite directions, and the distance between the other ends of the two opening and closing swing rods 3c gradually decreases; 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, which not only makes the two half-molds 2a of the extrusion blow molding mold 2 gradually come together to achieve mold closing, but also increases the distance between the extrusion blow molding mold 2 and the opening and closing mold seat 3a, and the extrusion blow molding mold 2 extends out of the opening and closing mold seat 3a, which is convenient for processing products.

[0040] When the piston rod of the driving member 3e gradually retracts from the extended state, the driving member 3e pulls the sliding seat 3b to move horizontally backward along the guiding direction of the first linear guide component 3d; the sliding seat 3b pulls the two connecting rods 3g to move and swing synchronously, and the connecting rod 3g pulls the opening and closing swing rod 3c to rotate around the first rotating shaft 3f, and the two opening and closing swing rods 3c swing synchronously and in opposite directions; 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, and the distance between the other ends of the two opening and closing swing rods 3c gradually increases; this not only makes the distance between the two half-molds 2a of the extrusion blow molding mold 2 gradually increase, realizing mold opening; it also reduces the distance between the extrusion blow molding mold 2 and the opening and closing mold seat 3a, and the extrusion blow molding mold 2 partially shrinks to the opening and closing mold seat 3a, which not only increases the distance between the two half-molds 2a, but also reduces the occupied volume, thereby avoiding interference between the movements of the two sets of extrusion blow molding molds 2.

[0041] The extrusion blow mold opening and closing device 3 can also reduce the overhang size of the extrusion blow mold 2, thereby improving the installation stability of the extrusion blow mold 2 and improving the upper and lower docking fit of the two sets of extrusion blow molds 2.

[0042] An extrusion blow molding machine comprises a frame 1 and two sets of the extrusion blow mold opening and closing devices 3, the two sets of the extrusion blow mold opening and closing devices 3 are arranged opposite to each other; a set of extrusion blow mold 2 is installed on each set of the extrusion blow mold opening and closing devices 3. The structure of the extrusion blow mold opening and closing devices 3 can make the extrusion blow mold 2 extend or retract, so that the distance between the two sets of the extrusion blow mold opening and closing devices 3 can be reduced, thereby improving the compactness of the structure of the extrusion blow molding machine.

[0043] The left and right sides of the opening and closing mold base 3a in the extrusion blow mold opening and closing mold device 3 are connected by the second linear guide assembly 4; thereby improving the bearing capacity and stability of the extrusion blow mold opening and closing mold device 3. The guiding direction of the second linear guide assembly 4 is the vertical direction, so that the extrusion blow mold opening and closing mold device 3 can be lifted and moved along the guiding direction of 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 mold 2 are horizontally opened and closed, so that the raw material 8 in the vertical state can be used for extrusion, which is conducive to improving the quality of the product.

[0044] Two sets of drive components 5 are installed on the frame 1, and the two sets of drive components 5 are connected to the two sets of extrusion blow mold opening and closing devices 3 in a one-to-one correspondence. The drive component 5 includes a motor 5a and a transmission belt 5b. The housing of the motor 5a is fixed on the frame 1, and the transmission belt 5b is connected to the opening and closing mold seat 3a of the extrusion blow mold opening and closing device 3; a follower wheel 5c connected to the transmission belt 5b is installed on the frame 1, and a driving wheel 5d connected to the transmission belt 5b is fixed on the rotating shaft of the motor 5a. By controlling the rotation direction and speed of the motor 5a, the extrusion blow mold opening and closing device 3 can be controlled to rise or fall and the lifting speed can be adjusted; the speed of the upper and lower sets of extrusion blow molds 2 can be controlled respectively, and the speed can be flexibly adjusted according to the actual situation, significantly improving the end-to-end docking direction between the upper and lower sets of extrusion blow molds 2. The speed control range of the motor 5a is large and the precision is high, so as to ensure that the descending speed of the blow mold opening and closing device is the same as the plastic extrusion speed or the descending speed of the blow mold opening and closing device is greater than the plastic extrusion speed.

[0045] Two sets of counterweight assemblies 6 are also installed on the frame 1, and the two sets of counterweight assemblies 6 are connected to the two sets of extrusion blow mold opening and closing devices 3 in a one-to-one correspondence. The counterweight assembly 6 includes a counterweight block 6a and a connecting belt 6b. A roller 6c is installed on the frame 1, and the connecting belt 6b is sleeved on the roller 6c. The connecting belt 6b is connected to the counterweight block 6a and the opening and closing mold seat 3a of the extrusion blow mold opening and closing device 3. According to the gravity of the extrusion blow mold opening and closing device 3 and the extrusion blow mold 2, the counterweight block 6a of appropriate weight is selected, which significantly reduces the load of the motor 5a, not only improves the speed control accuracy, but also improves the lifting flexibility and stability of the extrusion blow mold opening and closing device 3.

[0046] It is an objective fact that the transmission belt 5b has slight elasticity. By controlling the transition rotation of the motor 5a, it not only ensures that the upper and lower butted extrusion blow molds 2 are completely fitted together, but also generates a certain pressure between the upper and lower sets of extrusion blow molds 2, thereby significantly improving the end-to-end fit of the upper and lower sets of extrusion blow molds 2.

[0047] When the product is processed by the extrusion blow molding machine, the extrusion head 7 is located directly above the extrusion blow molding machine, and the raw material 8 extruded from the extrusion head 7 naturally moves vertically downward. The driving assembly 5 drives the extrusion blow mold opening and closing device 3 to move reciprocatingly downward and upward; during the downward process, the extrusion blow mold 2 is in a closed mold state; during the upward process, the extrusion blow mold 2 is in an open mold state.

[0048] By describing several specific processes of processing products using an extrusion blow molding machine, the functions and advantages of each component are further explained. For ease of description, the two sets of extrusion blow mold opening and closing devices 3 are respectively referred to as the first extrusion blow mold opening and closing device 3 and the second extrusion blow mold opening and closing device 3; the extrusion blow mold 2 installed on the first extrusion blow mold opening and closing device 3 is referred to as the first extrusion blow mold 2, and the extrusion blow mold 2 installed on the second extrusion blow mold opening and closing device 3 is referred to as the 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 the 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 the second drive assembly 5.

[0049] like Figure 5 As shown, the first extrusion blow mold 2 is located above the second extrusion blow mold 2, the first extrusion blow mold 2 is in a mold closing state, and the second extrusion blow mold 2 is in an open mold state. In this state, it is suitable to blow mold the raw material 8 in the first extrusion blow mold 2, so that the raw material 8 in the first extrusion blow mold 2 is blow molded into a product. During the blow molding process of the first extrusion blow mold 2, it is also necessary to control the motor 5a in the first drive assembly 5 to rotate, so that the first drive assembly 5 drives the first extrusion blow mold opening and closing device 3 to move downward continuously; in this process, the second drive assembly 5 drives the second extrusion blow mold opening and closing device 3 to move upward, and the first extrusion blow mold 2 passes between the two half molds 2a in the second extrusion blow mold 2; usually, the downward movement speed of the first extrusion blow mold opening and closing device 3 is the same as the speed of the extrusion head 7 extruding the raw material 8.

[0050] 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 following can be achieved: Figure 6 State shown; the second extrusion blow mold 2 is located above the first extrusion blow mold 2.

[0051] Blow molding machine is in Figure 6After the state shown, the upper end of the first extrusion blow mold 2 is docked with the lower end of the second extrusion blow mold 2 by manipulating the second drive assembly 5 and the drive member 3e in the second extrusion blow mold opening and closing device 3, and the second extrusion blow mold 2 is closed. Before the two half molds 2a in the second extrusion blow mold 2 are closed, the speed of the first extrusion blow mold opening and closing device 3 is controlled by controlling the rotation speed of the motor 5a in the first drive assembly 5 so that the downward movement speed of the first extrusion blow mold opening and closing device 3 is greater than the speed of the extrusion head 7 extruding the raw material 8; thereby, the extruded raw material 8 is axially stretched, which is beneficial to reshape the molecular chain of the raw material 8 and improve the properties of the material, especially the transparency.

[0052] After the first extrusion blow mold 2 and the second extrusion blow mold 2 are both in the mold closing state, the motor 5a in the second drive assembly 5 is controlled to rotate, so that the second drive assembly 5 drives the second extrusion blow mold opening and closing device 3 to move downward continuously. In this process, it is suitable to blow mold the raw material 8 in the second extrusion blow mold 2, so that the raw material 8 in the second extrusion blow mold 2 is blow-molded into a product. In this process, the speed of the motor 5a in the first drive assembly 5 is also increased, so that the downward movement speed of the first extrusion blow mold opening and closing device 3 is greater than the downward movement speed of the second extrusion blow mold 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.

[0053] After the first extrusion blow mold 2 is separated from the second extrusion blow mold 2, the driving member 3e in the first extrusion blow mold opening and closing device 3 is operated to open the first extrusion blow mold 2, and the product in the first extrusion blow mold 2 falls out.

[0054] Embodiment 2: The structure and principle of this embodiment are basically the same as those of Embodiment 1. The similarities are not described here. Only the differences are described. The differences are: the connection structure between the middle of the opening and closing swing rod 3c and the sliding seat 3b, the opening and closing swing rod 3c and the sliding seat 3b are connected by the fourth rotating shaft, and the shaft hole of the sliding seat 3b is strip-shaped. 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 3f; in this process, the fourth rotating shaft moves along the side wall of the shaft hole.

Claims

1. An extrusion blow molding mold opening and closing device, comprising an opening and closing mold base (3a), characterized in that: The extrusion blow molding mold opening and closing device also includes a sliding seat (3b) and two opening and closing swing rods (3c); the sliding seat (3b) is connected to the opening and closing mold seat (3a) via a first linear guide component (3d); a driving member (3e) connected to the sliding seat (3b) is installed on the opening and closing mold seat (3a); the middle part of the opening and closing swing rod (3c) is connected to the sliding seat (3b); one end of the opening and closing swing rod (3c) is installed with a half-mold mounting seat (3j); the half-mold (2a) of the extrusion blow molding mold (2) can be mounted on the half-mold mounting seat (3j); the other end of the opening and closing swing rod (3c) is rotatably connected to the opening and closing mold seat (3a) via a first rotating shaft (3f); when the driving member (3e) drives the sliding seat (3b) to move along the guide direction of the first linear guide component (3d), one end of the two opening and closing swing rods (3c) approaches or moves away from each other.

2. The extrusion blow molding mold opening and closing device according to claim 1, characterized in that: The first rotating shaft (3f) is located between the half-mold mounting seat (3j) and the sliding seat (3b), and the sliding seat (3b) is located between the opening and closing swing rod (3c) and the driving member (3e).

3. The extrusion blow molding mold opening and closing device according to claim 1, characterized in that: The driving member (3e) is an oil cylinder or an air cylinder, the cylinder body is rotationally connected to the opening and closing mold base (3a), and the piston rod is also rotationally connected to the sliding base (3b).

4. The extrusion blow molding mold opening and closing device according to claim 1, characterized in that: The two opening and closing swing rods (3c) share a first rotating shaft (3f).

5. The extrusion blow mold opening and closing device according to claim 1, 2, 3 or 4, characterized in that: A connecting rod (3g) is provided between the opening and closing swing rod (3c) and the sliding seat (3b); one end of the connecting rod (3g) is rotationally connected to the opening and closing swing rod (3c) via a second rotating shaft (3h), and the other end of the connecting rod (3g) is rotationally connected to the sliding seat (3b) via a third rotating shaft (3i); or the opening and closing swing rod (3c) and the sliding seat (3b) are connected via a fourth rotating shaft, and the shaft hole of the sliding seat (3b) is strip-shaped.

6. The extrusion blow mold opening and closing device according to claim 1, 2, 3 or 4, characterized in that: The opening and closing swing rod (3c) is in a bent shape, and the two opening and closing swing rods (3c) are arranged opposite to each other.

7. The extrusion blow mold opening and closing device according to claim 1, 2, 3 or 4, characterized in that: The half-mold mounting seat (3j) and the opening and closing swing rod (3c) are rotationally connected via a fifth rotating shaft (3k).

8. The extrusion blow mold opening and closing device according to claim 7, characterized in that: The extrusion blow mould opening and closing device (3) further comprises an elastic member capable of resetting the half mould mounting seat (3j).

9. An extrusion blow molding machine, comprising a frame, characterized in that: The extrusion blow molding machine also includes two groups of extrusion blow mold opening and closing devices (3) as described in claims 1 to 8, and each group of extrusion blow mold opening and closing devices (3) is equipped with a set of extrusion blow molds (2); the two groups of extrusion blow mold opening and closing devices (3) are arranged opposite to each other, and the opening and closing mold base (3a) is connected to the frame through a second linear guide component (4); when one set of extrusion blow molds (2) is in an open state and the other set of extrusion blow molds (2) is in a closed state, and one group of extrusion blow mold opening and closing devices (3) moves relative to the other group of extrusion blow mold opening and closing devices (3) along the guide direction of the second linear guide component (4), the extrusion blow mold (2) in the closed state can pass between the two half molds (2a) of the extrusion blow mold (2) in the open state.

10. The extrusion blow molding mold opening and closing device according to claim 9, characterized in that: Two sets of drive components (5) including motors (5a) are installed on the frame (1), and the two sets of drive components (5) are connected to two sets of extrusion blow mold opening and closing devices (3) in a one-to-one correspondence.

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