Automatic cover opening and closing device for extrusion blow mold

Abstract

The application discloses an automatic opening and closing cover device for an extrusion blow mold, which comprises a front mold half assembly and a rear mold half assembly, the front mold half assembly and the rear mold half assembly are arranged opposite to each other, the front mold half assembly comprises a first fixed upper mold, a first connecting rod mechanism and a first movable bottom mold, the first connecting rod mechanism is connected with the first fixed upper mold and the first movable bottom mold, the rear mold half assembly comprises a second fixed upper mold, a second connecting rod mechanism and a second movable bottom mold, and the second connecting rod mechanism is connected with the second fixed upper mold and the second movable bottom mold. The front mold half assembly and the rear mold half assembly are divided into the fixed upper mold and the movable bottom mold, the movable bottom mold can be separated from the fixed upper mold or combined with the fixed upper mold in the mold opening and closing process through the connecting rod mechanism, the recessed area of a product is avoided, interference between the mold and the product in the mold opening process is prevented, the automatic opening and closing of the fixed upper mold and the movable bottom mold are realized by using the mechanical principle of the connecting rod mechanism, and the structure of the equipment is simplified, and the use of a power source is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of mold structures, in particular to an automatic opening and closing cover device for an extrusion blow molding mold. Background Art

[0002] In the field of extrusion blow molding, for products with complex geometric shapes, especially those with recessed features on the upper or lower surface, the presence of the recessed features can cause interference between the front and rear mold halves and the molded product during the mold opening process, preventing the mold from opening smoothly. To address this issue, the industry typically splits the front and rear mold halves into two or more sections, arranged one above the other, based on the specific location of the recessed features on the upper or lower surface of the product. A power source, such as an oil cylinder, pneumatic cylinder, or motor, is used to drive the movable and fixed parts of the mold to combine or separate while the clamping device opens and closes the mold. This split mold half structure effectively avoids interference caused by the recessed areas of the product during the mold opening process, ensuring smooth opening and closing of the blow mold, and improving the yield and efficiency of the product molding process. However, adding a power source not only increases the energy consumption of production equipment but also increases the complexity and cost of motion control. Summary of the Invention

[0003] The purpose of the present invention is to provide an automatic opening and closing cover device for an extrusion blow molding mold to solve one or more technical problems existing in the above-mentioned background technology.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] An automatic opening and closing cover device for an extrusion blow molding mold comprises a front half mold assembly and a rear half mold assembly, the front half mold assembly and the rear half mold assembly being arranged front and rear opposite to each other, the front half mold assembly comprising a first fixed upper mold, a first connecting rod mechanism and a first movable bottom mold, the first movable bottom mold being arranged below the first fixed upper mold, the first connecting rod mechanism being connected to the first fixed upper mold and the first movable bottom mold, the rear half mold assembly comprising a second fixed upper mold, a second connecting rod mechanism and a second movable bottom mold, the second movable bottom mold being arranged below the second fixed upper mold, the second rod mechanism being connected to the second fixed upper mold and the second movable bottom mold;

[0006] When the front half mold assembly and the rear half mold assembly are closed, the first link mechanism and the second link mechanism respectively abut against the rear half mold assembly and the front half mold assembly, so that the first link mechanism drives the first movable bottom mold to fit against the bottom of the first fixed upper mold, and at the same time, the second link mechanism drives the second movable bottom mold to fit against the bottom of the second fixed upper mold;

[0007] When the front half mold assembly and the rear half mold assembly are opened, the first link mechanism and the second link mechanism are respectively separated from the rear half mold assembly and the front half mold assembly, and at the same time, the first movable mold and the second movable mold are respectively separated from the first fixed upper mold and the second fixed upper mold.

[0008] Preferably, the first connecting rod mechanism includes multiple first upper connecting rods, multiple first lower connecting rods and a first push rod, one end of the first upper connecting rod is hinged to the outer side of the first fixed upper mold, the other end of the first upper connecting rod is hinged to one end of the first lower connecting rod, the other end of the first lower connecting rod is hinged to the outer side of the first movable bottom mold, and the first push rod is horizontally arranged and hinged to the middle part of the multiple first connecting rods.

[0009] Preferably, the second connecting rod mechanism includes multiple second upper connecting rods, multiple second lower connecting rods and a second push rod, one end of the second upper connecting rod is hinged to the outer side of the second fixed upper mold, the other end of the second upper connecting rod is hinged to one end of the second lower connecting rod, the other end of the second lower connecting rod is hinged to the outer side of the second movable bottom mold, the second push rod is horizontally arranged and hinged to the middle part of the multiple second upper connecting rods, and the first push rod and the second push rod are arranged up and down.

[0010] Preferably, the first connecting rod mechanism also includes a first connecting bracket and a second connecting bracket, the first connecting bracket and the second connecting bracket are arranged on both sides of the first fixed upper mold and the first movable bottom mold, one end of the first upper connecting rod is hinged to the first connecting bracket, and the other end of the first lower connecting rod is hinged to the second connecting bracket; the second connecting rod mechanism also includes a third connecting bracket and a fourth connecting bracket, the third connecting bracket and the fourth connecting bracket are arranged on both sides of the second fixed upper mold and the second movable bottom mold, one end of the second upper connecting rod is hinged to the second connecting bracket, and the other end of the second lower connecting rod is hinged to the second connecting bracket.

[0011] Preferably, the first connecting rod mechanism also includes a first pin and a first bearing, the first pin is arranged at the end of the first push rod away from the first fixed upper mold, and the first bearing sleeve is arranged on the outside of the first pin; the second connecting rod mechanism also includes a second pin and a second bearing, the second pin is arranged at the end of the second push rod away from the second fixed upper mold, and the second bearing sleeve is arranged on the outside of the second pin.

[0012] Preferably, the first connecting rod mechanism also includes a first limit block, which is arranged on the outside of the first fixed upper mold, and the first limit block is horizontally arranged with the second push rod; the second connecting rod mechanism also includes a second limit block, which is arranged on the outside of the second fixed upper mold, and the second limit block is horizontally arranged with the first push rod.

[0013] Preferably, the front half mold assembly also includes a first mounting plate, the first fixed upper mold is fixed on the first mounting plate, and the first movable bottom mold is slidably engaged with the first mounting plate; the rear half mold assembly also includes a second mounting plate, the second fixed upper mold is fixed on the second mounting plate, and the second movable bottom mold is slidably engaged with the second mounting plate.

[0014] The beneficial effects of the present invention are as follows: the present invention divides the front half mold assembly and the rear half mold assembly into a fixed upper mold and a movable bottom mold, and through the connecting rod mechanism, the movable bottom mold can be separated or combined with the fixed upper mold during the mold opening and closing process, avoiding the recessed area of ​​the product and preventing interference between the mold and the product during the mold opening process, thereby significantly improving the molding quality and yield of the product. Compared with the prior art, there is no need to set up an additional power source to drive the movable bottom mold. The present invention uses the mechanical principle of the connecting rod mechanism to realize the automatic opening and closing of the fixed upper mold and the movable bottom mold, which not only simplifies the structure of the equipment, but also reduces the use of power sources, thereby reducing the energy consumption, maintenance costs and complexity of motion control of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings further illustrate the present invention, but the contents in the accompanying drawings do not constitute any limitation to the present invention.

[0016] Figure 1 It is a schematic diagram of the overall structure of one embodiment of the present invention;

[0017] Figure 2 This is a schematic structural diagram of a front half mold assembly according to one embodiment of the present invention;

[0018] Figure 3 Schematic diagram of the structure of the rear half mold assembly of one embodiment of the present invention.

[0019] Among them: front half mold assembly 1, rear half mold assembly 2, first fixed upper mold 11, first connecting rod mechanism 12, first movable bottom mold 13, second fixed upper mold 21, second connecting rod mechanism 22, second movable bottom mold 23, first upper connecting rod 121, first lower connecting rod 122, first push rod 123, second upper connecting rod 221, second lower connecting rod 222, second push rod 223, first connecting bracket 124, second connecting bracket 125, third connecting bracket 224, fourth connecting bracket 225, first pin 126, first bearing 127, second pin 226, second bearing 227, first limit block 111, second limit block 211, first mounting plate 14, second mounting plate 24, first recess 131, second recess 231. DETAILED DESCRIPTION

[0020] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0021] An automatic opening and closing cover device for an extrusion blow molding mold of this embodiment is shown in the attached Figure 1 , including a front half mold assembly 1 and a rear half mold assembly 2, the front half mold assembly 1 and the rear half mold assembly 2 are respectively installed on the two locking platens of the clamping device, the front half mold assembly 1 and the rear half mold assembly 2 are arranged front and back relative to each other, the front half mold assembly 1 includes a first fixed upper mold 11, a first connecting rod mechanism 12 and a first movable bottom mold 13, the first movable bottom mold 13 is arranged below the first fixed upper mold 11, the first connecting rod mechanism 12 is connected to the first fixed upper mold 11 and the first movable bottom mold 13, the rear half mold assembly 2 includes a second fixed upper mold 21, a second connecting rod mechanism 22 and a second movable bottom mold 23, the second movable bottom mold 23 is arranged below the second fixed upper mold 21, the second connecting rod mechanism 22 is connected to the second fixed upper mold 21 and the second movable bottom mold 23, the bottom of the cavity of the first movable bottom mold 13 is provided with a first recessed portion 131, and the bottom of the cavity of the second movable bottom mold 23 is provided with a second recessed portion 231;

[0022] When the front mold assembly 1 and the rear mold assembly 2 are closed, the first link mechanism 12 and the second link mechanism 22 respectively abut against the rear mold assembly 2 and the front mold assembly 1, so that the first link mechanism 12 drives the first movable bottom mold 13 to fit the bottom of the first fixed upper mold 11, and at the same time the second link mechanism 22 drives the second movable bottom mold 23 to fit the bottom of the second fixed upper mold 21;

[0023] When the front half mold assembly 1 and the rear half mold assembly 2 are opened, the first link mechanism 12 and the second link mechanism 22 are respectively separated from the rear half mold assembly 2 and the front half mold assembly 1, and at the same time, the first movable bottom mold 13 and the second movable bottom mold 23 are respectively separated from the first fixed upper mold 11 and the second fixed upper mold 21.

[0024] The device divides the front half mold assembly 1 and the rear half mold assembly 2 into a first fixed upper mold 11 and a first movable bottom mold 13, as well as a second fixed upper mold 21 and a second movable bottom mold 23. The first movable bottom mold 13 and the second movable bottom mold 23 are respectively separated from or combined with the first fixed upper mold 11 and the second fixed upper mold 21 during the mold opening and closing process via a first link mechanism 12 and a second link mechanism 22. During the mold opening process of the mold clamping device, the first movable bottom mold 13 and the second movable bottom mold 23 move upward and downward away from the molded product from below the recessed area of ​​the product, thereby allowing the first fixed upper mold 11 and the second fixed upper mold 21, which move forward and backward, to avoid the recessed area of ​​the product, preventing interference between the mold and the product during the mold opening process, thereby significantly improving the molding quality and yield rate of the product. Compared with the prior art which requires an additional power source to drive the movement of the movable bottom mold, this embodiment utilizes the mechanical principle of the connecting rod mechanism to realize the automatic opening and closing of the first fixed upper mold 11 and the first movable bottom mold 13, and the second fixed upper mold 21 and the second movable bottom mold 23, which not only simplifies the structure of the equipment, but also reduces the use of power sources, thereby reducing the energy consumption, maintenance costs and complexity of motion control of the equipment.

[0025] Preferably, refer to the attached Figure 2 The first linkage mechanism 12 includes two first upper links 121, two first lower links 122, and a first push rod 123. The two first upper links 121 are arranged in parallel, and the two first lower links 122 are arranged in parallel. One end of the first upper link 121 is hinged to the outside of the first fixed upper mold 11, and the other end of the first upper link 121 is hinged to one end of the first lower link 122. The other end of the first lower link 122 is hinged to the outside of the first movable bottom mold 13. The first push rod 123 is arranged horizontally and hinged to the middle of the multiple first links. The end of the first push rod 123 extends toward the second fixed upper mold 21. The hinged connection of the multiple first upper links 121 and the multiple first lower links 122 forms a stable linkage structure between the first fixed upper mold 11 and the first movable bottom mold 13, ensuring that the product and mold can be stably supported during the opening and closing process. The horizontal arrangement of the first push rod 123 and the hinged connection with the middle portions of the plurality of first connecting rods enable the first push rod 123 to drive the movement of the first upper connecting rod 121 and the first lower connecting rod 122 to realize the opening and closing of the mold.

[0026] Likewise, refer to the attached Figure 3The second linkage mechanism 22 includes multiple second upper links 221, multiple second lower links 222, and a second push rod 223. One end of the second upper links 221 is hinged to the outside of the second fixed upper mold 21, and the other end of the second upper links 221 is hinged to one end of the second lower links 222. The other end of the second lower links 222 is hinged to the outside of the second movable bottom mold 23. The second push rod 223 is arranged horizontally and hinged to the middle of the multiple second upper links. The first push rod 123 and the second push rod 223 are arranged vertically. The arrangement of the second linkage mechanism 22 ensures stable support for the product and mold during opening and closing, and enables the second movable bottom mold 23 to be combined or separated from the second fixed upper mold 21. The vertical arrangement of the first push rod 123 and the second push rod 223 prevents motion interference.

[0027] Preferably, the first linkage mechanism 12 further includes a first connecting bracket 124 and a second connecting bracket 125, which are arranged on both sides of the first fixed upper mold 11 and the first movable bottom mold 13. One end of the first upper connecting rod 121 is hinged to the first connecting bracket 124, and the other end of the first lower connecting rod 122 is hinged to the second connecting bracket 125. The second linkage mechanism 22 further includes a third connecting bracket 224 and a fourth connecting bracket 225, which are arranged on both sides of the second fixed upper mold 21 and the second movable bottom mold 23. One end of the second upper connecting rod 221 is hinged to the third connecting bracket 224, and the other end of the second lower connecting rod 222 is hinged to the fourth connecting bracket 225. The provision of the connecting brackets prevents the linkage mechanism from affecting the molding surface of the mold.

[0028] Preferably, the first linkage mechanism 12 further includes a first pin 126 and a first bearing 127. The first pin 126 is disposed at an end of the first push rod 123 away from the first fixed upper mold 11, and the first bearing 127 is sleeved on the outside of the first pin 126. The second linkage mechanism 22 further includes a second pin 226 and a second bearing 227. The second pin 226 is disposed at an end of the second push rod 223 away from the second fixed upper mold 21, and the second bearing 227 is sleeved on the outside of the second pin 226. The arrangement of these pins and bearings reduces friction, extends service life, and saves maintenance costs.

[0029] Preferably, the first linkage 12 further includes a first stopper 111, which is disposed on the outside of the first fixed upper mold 11 and is arranged horizontally with the second push rod 223. The second linkage 22 further includes a second stopper 211, which is disposed on the outside of the second fixed upper mold 21 and is arranged horizontally with the first push rod 123. The provision of these stoppers ensures precise control and stability of the mold during opening and closing.

[0030] Preferably, the front mold assembly 1 further includes a first mounting plate 14, to which the first fixed upper mold 11 is fixed, and to which the first movable bottom mold 13 is slidably engaged. The rear mold assembly 2 further includes a second mounting plate 24, to which the second fixed upper mold 21 is fixed, and to which the second movable bottom mold 23 is slidably engaged. The provision of these mounting plates not only serves to fix the mold but also guides and limits the movement of the movable bottom mold.

[0031] The working principle of this embodiment is as follows: the front half mold assembly 1 and the rear half mold assembly 2 of this embodiment are respectively installed on the two locking platens of the locking device. When closing the mold, the locking device provides power to make the first fixed upper mold 11 and the second fixed upper mold 21 move relatively close to each other at the same time. During the mold closing process, the first push rod 123 and the second push rod 223 respectively abut against the second limit block 211 and the first limit block 111, and make the first push rod 123 and the second push rod 223 make relative movements in the opposite directions to the first fixed upper mold 11 and the second fixed upper mold 21 respectively. Under the limitation of the first mounting plate 14 and the second mounting plate 24, the first lower connecting rod 122 and the second lower connecting rod 222 pull the first movable bottom mold 13 and the second movable bottom mold 23 to move upward until they reach the locking position, and the first movable bottom mold 13 and the second movable bottom mold 23 are respectively fitted with the bottom of the first fixed upper mold 11 and the second fixed upper mold 21.

[0032] When the mold is opened, the first fixed upper mold 11 and the second fixed upper mold 21 are moved away from each other at the same time by relying on the power of the clamping device. Since the product cooperates with the first recessed portion 131 and the second recessed portion 231 in the mold cavity of the first movable bottom mold 13 and the second movable bottom mold 23, a downward thrust is generated during the mold opening process, and under the action of the self-weight of the first movable bottom mold 13 and the second movable bottom mold 23, the first movable bottom mold 13 and the second movable bottom mold 23 move downward, realizing the separation of the first movable bottom mold 13 and the first fixed upper mold 11, and the second movable bottom mold 23 and the second fixed upper mold 21, thereby completing the mold opening of the front half mold assembly 1 and the rear half mold assembly 2.

[0033] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are intended solely to illustrate the principles of the present invention and are not to be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, those skilled in the art will readily conceive of other specific embodiments of the present invention without inventive effort, and such embodiments will fall within the scope of protection of the present invention.

Claims

1. An automatic opening and closing cover device for an extrusion blow molding mold, characterized in that: The front mold assembly comprises a front mold half assembly and a rear mold half assembly, wherein the front mold half assembly and the rear mold half assembly are arranged relative to each other front and back, the front mold half assembly comprises a first fixed upper mold, a first connecting rod mechanism and a first movable bottom mold, the first movable bottom mold is arranged below the first fixed upper mold, the first connecting rod mechanism is connected to the first fixed upper mold and the first movable bottom mold, the rear mold half assembly comprises a second fixed upper mold, a second connecting rod mechanism and a second movable bottom mold, the second movable bottom mold is arranged below the second fixed upper mold, the second connecting rod mechanism is connected to the second fixed upper mold and the second movable bottom mold; When the front half mold assembly and the rear half mold assembly are closed, the first link mechanism and the second link mechanism respectively abut against the rear half mold assembly and the front half mold assembly, so that the first link mechanism drives the first movable bottom mold to fit against the bottom of the first fixed upper mold, and at the same time, the second link mechanism drives the second movable bottom mold to fit against the bottom of the second fixed upper mold; When the front half mold assembly and the rear half mold assembly are opened, the first link mechanism and the second link mechanism are respectively separated from the rear half mold assembly and the front half mold assembly, and the first movable mold and the second movable mold are respectively separated from the first fixed upper mold and the second fixed upper mold; The first connecting rod mechanism includes a plurality of first upper connecting rods, a plurality of first lower connecting rods and a first push rod, one end of the first upper connecting rod is hinged to the outer side of the first fixed upper mold, the other end of the first upper connecting rod is hinged to one end of the first lower connecting rod, the other end of the first lower connecting rod is hinged to the outer side of the first movable bottom mold, and the first push rod is horizontally arranged and hinged to the middle part of the plurality of first connecting rods; The second connecting rod mechanism includes a plurality of second upper connecting rods, a plurality of second lower connecting rods and a second push rod, one end of the second upper connecting rod is hinged to the outer side of the second fixed upper mold, the other end of the second upper connecting rod is hinged to one end of the second lower connecting rod, and the other end of the second lower connecting rod is hinged to the outer side of the second movable bottom mold, the second push rod is horizontally arranged and hinged to the middle part of the plurality of second upper connecting rods, and the first push rod and the second push rod are arranged above and below; The front half mold assembly also includes a first mounting plate, the first fixed upper mold is fixed on the first mounting plate, and the first movable bottom mold is slidably engaged with the first mounting plate. The rear half mold assembly also includes a second mounting plate, the second fixed upper mold is fixed on the second mounting plate, and the second movable bottom mold is slidably engaged with the second mounting plate.

2. The automatic opening and closing cover device for an extrusion blow molding mold according to claim 1, characterized in that: The first connecting rod mechanism also includes a first connecting bracket and a second connecting bracket, the first connecting bracket and the second connecting bracket are arranged on both sides of the first fixed upper mold and the first movable bottom mold, one end of the first upper connecting rod is hinged to the first connecting bracket, and the other end of the first lower connecting rod is hinged to the second connecting bracket; the second connecting rod mechanism also includes a third connecting bracket and a fourth connecting bracket, the third connecting bracket and the fourth connecting bracket are arranged on both sides of the second fixed upper mold and the second movable bottom mold, one end of the second upper connecting rod is hinged to the second connecting bracket, and the other end of the second lower connecting rod is hinged to the second connecting bracket.

3. The automatic opening and closing cover device for an extrusion blow molding mold according to claim 1, characterized in that: The first connecting rod mechanism also includes a first pin and a first bearing, the first pin is arranged at the end of the first push rod away from the first fixed upper mold, and the first bearing sleeve is arranged on the outside of the first pin; the second connecting rod mechanism also includes a second pin and a second bearing, the second pin is arranged at the end of the second push rod away from the second fixed upper mold, and the second bearing sleeve is arranged on the outside of the second pin.

4. The automatic opening and closing cover device for an extrusion blow molding mold according to claim 1, characterized in that: The first connecting rod mechanism also includes a first limit block, which is arranged on the outside of the first fixed upper mold, and the first limit block is horizontally arranged with the second push rod; the second connecting rod mechanism also includes a second limit block, which is arranged on the outside of the second fixed upper mold, and the second limit block is horizontally arranged with the first push rod.

Images