Automatic cover opening and closing device for extrusion blowing mold

Abstract

The automatic cover opening and closing device comprises a front half mold assembly and a rear half mold assembly, the front half mold assembly and the rear half mold assembly are oppositely arranged front and back, and the front half mold 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 die and the first movable bottom die, the rear half die assembly comprises a second fixed upper die, a second connecting rod mechanism and a second movable bottom die, and the second rod mechanism is connected with the second fixed upper die and the second movable bottom die. The front half mold assembly and the rear half mold assembly are divided into the fixed upper mold and the movable bottom mold, the movable bottom mold can be separated from or combined with the fixed upper mold in the mold opening and closing process through the connecting rod mechanism, a concave area of a product is avoided, interference between the mold and the product in the mold opening process is prevented, and the product quality is improved. Automatic opening and closing of the fixed upper die and the movable bottom die are achieved through the mechanical principle of a connecting rod mechanism, the structure of equipment is simplified, and 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 concave features on the upper or lower surface, due to the presence of the concave features, the front and rear molds will interfere with the molded product during the mold opening process, making it impossible to open the mold smoothly. In order to solve this problem, the industry usually divides the front and rear molds into two or more parts arranged up and down according to the specific location of the concave features on the upper or lower surface of the product, and uses a power source such as an oil cylinder, an air cylinder or a motor to drive the movable part of the mold to combine or separate with the fixed part while the clamping device opens and closes the mold. The use of this split half-mold structure effectively avoids the interference caused by the concave area of ​​the product during the mold opening process, ensures that the blow molding mold can be opened and closed smoothly, and improves the yield and efficiency of product molding. 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: 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, wherein the front half mold assembly and the rear half mold assembly are arranged front and rear opposite to each other, the front half mold 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 half mold 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, and the second rod mechanism is connected to the second fixed upper mold and the second movable bottom mold; When the front half mold assembly is molded with the rear half mold assembly, 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 the bottom of the first fixed upper mold, and the second link mechanism drives the second movable bottom mold to fit the bottom of the second fixed upper mold; When the front half mold assembly and the rear half mold assembly are opened, the first connecting rod mechanism and the second connecting rod 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.

[0005] Preferably, 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.

[0006] Preferably, 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, 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 parts of the plurality of second upper connecting rods, and the first push rod and the second push rod are arranged vertically.

[0007] 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.

[0008] Preferably, the first connecting rod mechanism also includes a first pin and a first bearing, the first pin is arranged at an end of the first push rod away from the first fixed upper mold, and the first bearing sleeve is arranged on the outer side of the first pin; the second connecting rod mechanism also includes a second pin and a second bearing, the second pin is arranged at an end of the second push rod away from the second fixed upper mold, and the second bearing sleeve is arranged on the outer side of the second pin.

[0009] Preferably, the first connecting rod mechanism also includes a first limit block, which is arranged on the outer side 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 outer side of the second fixed upper mold, and the second limit block is horizontally arranged with the first push rod.

[0010] Preferably, the front half mold assembly also includes a first mounting plate, the first fixed upper mold is fixed on the first mounting plate, the first movable bottom mold is slidably matched with the first mounting plate, and 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 matched with the second mounting plate.

[0011] 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 a 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 rate 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 utilizes 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 the power source, thereby reducing the energy consumption, maintenance cost and complexity of motion control of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings further illustrate the present invention, but the contents in the accompanying drawings do not constitute any limitation to the present invention.

[0013] Figure 1 It is a schematic diagram of the overall structure of one embodiment of the present invention; Figure 2 is a schematic structural diagram of a front half mold assembly of one embodiment of the present invention; Figure 3 It is a schematic structural diagram of a rear half mold assembly according to one embodiment of the present invention.

[0014] 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 recessed portion 131, second recessed portion 231. DETAILED DESCRIPTION

[0015] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0016] An automatic cover opening and closing device for an extrusion blow molding mold of this embodiment is shown in FIG. 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 locking 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 first movable bottom mold 13 has a first recessed portion 131 at the bottom of the cavity, and the second movable bottom mold 23 has a second recessed portion 231 at the bottom of the cavity; When the front half mold assembly 1 and the rear half mold assembly 2 are molded together, the first link mechanism 12 and the second link mechanism 22 respectively abut against the rear half mold assembly 2 and the front half 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 the second link mechanism 22 drives the second movable bottom mold 23 to fit the bottom of the second fixed upper mold 21; When the front half mold assembly 1 and the rear half mold assembly 2 are opened, the first connecting rod mechanism 12 and the second connecting rod 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.

[0017] 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 and a second fixed upper mold 21 and a second movable bottom mold 23, and respectively enables the first movable bottom mold 13 and the second movable bottom mold 23 to be separated or combined with the first fixed upper mold 11 and the second fixed upper mold 21 during the mold opening and closing process through the first link mechanism 12 and the second link mechanism 22. During the mold opening process of the mold clamping device for completing the molding process, the first movable bottom mold 13 and the second movable bottom mold 23 move away from the molded product from below the concave area of ​​the product, thereby allowing the first fixed upper mold 11 and the second fixed upper mold 21 moving forward and backward to avoid the concave 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 of the equipment, maintenance costs and the complexity of motion control.

[0018] Preferably, refer to the attached Figure 2 The first link 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, 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, 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 plurality of first links, and the end of the first push rod 123 extends toward the second fixed upper mold 21. By setting a plurality of first upper links 121 and a plurality of first lower links 122 in hinged connection, a stable link structure is formed between the first fixed upper mold 11 and the first movable bottom mold 13, ensuring that the product and the mold can be stably supported during the opening and closing process. The first push rod 123 is horizontally arranged and hinged to the middle of the plurality of first connecting rods, so that the first push rod 123 can 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.

[0019] Similarly, refer to the attached Figure 3The second link mechanism 22 includes a plurality of second upper links 221, a plurality of second lower links 222, and a second push rod 223. One end of the second upper link 221 is hinged to the outside of the second fixed upper mold 21, the other end of the second upper link 221 is hinged to one end of the second lower link 222, the other end of the second lower link 222 is hinged to the outside of the second movable bottom mold 23, the second push rod 223 is horizontally arranged and hinged to the middle of the plurality of second upper links, and the first push rod 123 and the second push rod 223 are arranged up and down. The arrangement of the second link mechanism 22 ensures that the product and the mold can be stably supported during the opening and closing process, and realizes the combination or separation of the second movable bottom mold 23 and the second fixed upper mold 21. The up and down arrangement of the first push rod 123 and the second push rod 223 avoids motion interference.

[0020] Preferably, the first link 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 link 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 setting of the connecting brackets avoids the influence of the link mechanism on the molding surface of the mold.

[0021] Preferably, the first link mechanism 12 further includes a first pin 126 and a first bearing 127, wherein the first pin 126 is disposed at one end of the first push rod 123 away from the first fixed upper die 11, and the first bearing 127 is sleeved on the outside of the first pin 126; the second link mechanism 22 further includes a second pin 226 and a second bearing 227, wherein the second pin 226 is disposed at one end of the second push rod 223 away from the second fixed upper die 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, prolongs service life, and saves maintenance costs.

[0022] Preferably, the first link mechanism 12 further includes a first stopper 111, which is disposed on the outer side of the first fixed upper mold 11 and is horizontally arranged with the second push rod 223; the second link mechanism 22 further includes a second stopper 211, which is disposed on the outer side of the second fixed upper mold 21 and is horizontally arranged with the first push rod 123. The arrangement of these stoppers ensures the precise control and stability of the mold during the opening and closing process.

[0023] Preferably, the front half mold assembly 1 further includes a first mounting plate 14, the first fixed upper mold 11 is fixed on the first mounting plate 14, and the first movable bottom mold 13 is slidably matched with the first mounting plate 14; the rear half mold assembly 2 further includes a second mounting plate 24, the second fixed upper mold 21 is fixed on the second mounting plate 24, and the second movable bottom mold 23 is slidably matched with the second mounting plate 24. The arrangement of these mounting plates not only plays a fixing role, but also plays a guiding and limiting role in the movement of the movable bottom mold.

[0024] 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 the mold is closed, 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 respectively make relative movements in the opposite directions to the first fixed upper mold 11 and the second fixed upper mold 21. 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 respectively fit with the bottom of the first fixed upper mold 11 and the second fixed upper mold 21.

[0025] 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 first recessed portion 131 and the second recessed portion 231 in the mold cavity of the product and the first movable bottom mold 13 and the second movable bottom mold 23 cooperate, a downward thrust is generated during the mold opening process, and the first movable bottom mold 13 and the second movable bottom mold 23 move downward under the action of their own weight, so as to separate the first movable bottom mold 13 from the first fixed upper mold 11, and the second movable bottom mold 23 from the second fixed upper mold 21, and complete the mold opening of the front half mold assembly 1 and the rear half mold assembly 2.

[0026] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the scope of protection of the present invention.

Claims

1. An automatic cover opening and closing device for an extrusion blow molding mold, characterized in that: The front half mold assembly comprises a front half mold assembly and a rear half mold assembly, wherein the front half mold assembly and the rear half mold assembly are arranged front and rear oppositely, the front half mold 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 with the first fixed upper mold and the first movable bottom mold, the rear half mold 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, and the second rod mechanism is connected with the second fixed upper mold and the second movable bottom mold; When the front half mold assembly is molded with the rear half mold assembly, 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 the bottom of the first fixed upper mold, and the second link mechanism drives the second movable bottom mold to fit the bottom of the second fixed upper mold; When the front half mold assembly and the rear half mold assembly are opened, the first connecting rod mechanism and the second connecting rod 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.

2. The automatic cover opening and closing device for an extrusion blow molding mold according to claim 1, characterized in that: 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.

3. The automatic cover opening and closing device for an extrusion blow molding mold according to claim 2, characterized in that: 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 parts of the multiple second upper connecting rods, and the first push rod and the second push rod are arranged up and down.

4. The automatic cover opening and closing device for an extrusion blow molding mold according to claim 3, 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.

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

6. The automatic cover opening and closing device for an extrusion blow molding mold according to claim 3, characterized in that: The first connecting rod mechanism also includes a first limit block, which is arranged on the outer side 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 outer side of the second fixed upper mold, and the second limit block is horizontally arranged with the first push rod.

7. The automatic cover opening and closing device for an extrusion blow molding mold according to claim 1, characterized in that: 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 matched 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 matched with the second mounting plate.

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