PET bottle production device

Abstract

The utility model discloses a PET (Polyethylene Terephthalate) bottle production device which comprises a three-station injection blow molding machine, the three-station injection blow molding machine comprises a machine base and a rotary working table arranged on the machine base, and the working table is provided with three core rod groups which are arranged according to a 120-degree equilateral triangle; a blank injection station, a blow molding station and a demolding station which are matched with the core rod sets arranged in an equilateral triangle mode and distributed in a triangle mode are arranged beside the workbench, and each of the blank injection station and the blow molding station comprises a fixedly-arranged lower mold assembly, an upper mold assembly which is driven by a hydraulic machine to ascend and descend and matched with the lower mold assembly and a lever mechanism. A guide column in sliding connection with the upper die assembly is arranged on the machine base in the vertical direction, and the locking force of the hydraulic machine for pushing the upper die assembly to be matched with the lower die assembly through the lever mechanism is not smaller than five times of the thrust of the hydraulic machine. According to the PET bottle production device, qualified locking force is generated through the lever principle under the condition that the thrust of a hydraulic machine is insufficient, and produced bottle bodies do not have joint lines.

Description

Technical Field

[0001] The utility model relates to a PET bottle production device, belonging to the technical field of blow molding plastic bottle production equipment. Background Art

[0002] In order to improve the smoothness and transparency of plastic cosmetic bottles, PET materials are now used to make bottles. In order to improve production efficiency, a three-station injection blow molding machine disclosed in application number CN201811280712.8 has appeared. It includes a rotary workbench with three core rod groups arranged in an equilateral triangle of 120 degrees. Beside the workbench are provided with an injection station, a blow molding station, and a demoulding station that are arranged in a triangular pattern with the core rod groups arranged in an equilateral triangle. Each time the workbench rotates 120 degrees, the core rod group is sequentially connected to the injection station, the blow molding station, and the demoulding station. The molding station and the demolding station cooperate with each other to realize injection, blow molding and demolding. However, the injection station and blow molding station of the existing three-station injection-blow molding machine both directly install the upper mold assembly on the hydraulic press, and the upper mold assembly and the lower mold assembly are locked together by directly pressing down with the hydraulic press. In this case, the locking force can only reach about 35 tons, and there will be a gap at the joint of the upper and lower molds, so that there will be a parting line on the produced bottle body. If the produced bottle body is to have no parting line, the locking force needs to be at least 150 tons, which is beyond the reach of the existing three-station injection-blow molding machine. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide a PET bottle production device, which uses a three-station injection blow molding machine whose hydraulic press is connected to the mold through a lever mechanism. When the thrust of the hydraulic press is insufficient, a qualified locking force is generated through the lever principle, so that the produced bottle body will not have a mold line, which can solve the shortcomings of the existing technology.

[0004] The technical solution of the utility model is: a PET bottle production device, including a three-station injection blow molding machine, the three-station injection blow molding machine includes a machine base, a rotary workbench arranged on the machine base, the workbench is provided with three core rod groups arranged in an equilateral triangle of 120 degrees, and the workbench is provided with an injection station, a blow molding station, and a demoulding station that are triangularly distributed and matched with the core rod groups arranged in the equilateral triangle. The injection station and the blow molding station both include a fixed lower mold assembly, an upper mold assembly that cooperates with the lower mold assembly and is driven to rise and fall by a hydraulic press, including a lever mechanism, a guide column that is slidably connected to the upper mold assembly in a vertical direction is provided on the machine base, the lever mechanism is transferred to the machine base, one end is connected to the upper mold assembly, and the other end is connected to the hydraulic press, and the hydraulic press pushes the upper mold assembly and the lower mold assembly to cooperate with each other through the lever mechanism, and the locking force is not less than 5 times the thrust of the hydraulic press.

[0005] Further, a conveyor belt is provided beside the demolding station. The demolding station includes a driving device and a demolding rack. The demolding rack is provided with a clamping groove that cooperates with the bottle body. The demolding rack is driven by the driving device to move reciprocally, and the bottle body located on the mandrel group is transferred to the conveyor belt.

[0006] Further, it includes an air pump. The driving device includes a rotating mechanism. An air duct connected to the air pump is provided on the demolding rack, and an air port communicating with the air duct is provided at the clamping groove. When the air pump operates, a negative pressure for adsorbing the bottle body can be generated at the air port. The demolding rack is driven by the rotating mechanism to rotate and, in cooperation with the operation of the air pump, enables the bottle body to stand upright on the conveyor belt for conveying.

[0007] Further, an adjusting mechanism is provided on the conveyor belt. Baffles connected to the adjusting mechanism are provided on both sides of the conveyor belt. The distance and height of the baffles are adjusted by the adjusting mechanism.

[0008] Further, a height adjusting mechanism is provided at the bottom of the conveyor belt, and the height of the conveyor belt is adjusted by the height adjusting mechanism.

[0009] By implementing the present utility model, the lower die assembly at the preform injection station and the blow molding station is fixedly arranged on the machine base. The upper die assembly is connected to the hydraulic press through a lever mechanism. The machine base is fixedly provided with guide columns that are slidably connected to the upper die assembly. The thrust of the hydraulic press is about 35 tons, and the ratio of the length of the power arm to the resistance arm of the lever mechanism is not less than 5. After being transmitted by the lever mechanism, the locking force between the upper die assembly and the lower die assembly will not be less than 150 tons, which can closely fit the upper die assembly and the lower die assembly. There will be no mold joint line on the produced bottle body, improving the quality of the product. Description of the Drawings

[0010] Figure 1 It is a schematic diagram when the demolding rack of the present utility model takes the bottle body away from the mandrel group;

[0011] Figure 2 It is a schematic diagram of the bottle body of the present utility model placed on the conveyor.

[0012] As shown in the figure: machine base 1; workbench 2; preform injection station 3; blow molding station 4; demolding station 5; lower die assembly 6; upper die assembly 7; guide column 8; lever 9; conveyor belt 10; demolding rack 11; clamping groove 12; air port 13; bracket 14; motor 15; baffle 16; vertical sliding rod 17; connecting piece 18; horizontal sliding rod 19; screw rod lifting mechanism 20; mandrel group 21; hydraulic press 22; telescopic air cylinder 23. Detailed Description of the Embodiment

[0013] Embodiment of the present utility model: As Figures 1 to 2As shown, a PET bottle production device includes a three-station injection blow molding machine, which includes a machine base 1 and a rotary workbench 2 arranged on the machine base 1. The workbench 2 is provided with three core rod groups 21 arranged in an equilateral triangle of 120 degrees. Beside the workbench 2, there are provided with an injection station 3, a blow molding station 4, and a demolding station 5, which are arranged in a triangular distribution to cooperate with the core rod groups arranged in the equilateral triangle. The workbench 2 is lifted and rotated 120 degrees each time to achieve the coordination of the core rod groups 21 on each side with each station. The injection station 3 and the blow molding station 4 both include a fixed lower mold assembly 6, which is driven by a hydraulic press 22 to lift and lower the lower mold assembly. The upper mold assembly 7 that cooperates with the mold assembly 6 includes a lever mechanism. A guide column 8 that slides with the upper mold assembly 6 is provided on the machine base 1 in the vertical direction. The lever mechanism includes a lever 9 connected to the machine base 1. One end of the lever 9 is connected to the upper mold assembly 7, and the other end is connected to the hydraulic press 22. The thrust of the hydraulic press 22 is usually 35 tons. The ratio of the length of the power arm of the lever mechanism to the resistance arm is not less than 5, so that the locking force between the upper mold assembly 7 and the lower mold assembly 6 after transmission by the lever mechanism will not be less than 150 tons, so that the upper mold assembly 7 and the lower mold assembly 6 can be tightly matched, and there will be no mold line on the produced bottle body, thereby improving the quality of the product.

[0014] As a preferred option, Figure 1 As shown, a conveyor belt 10 is provided next to the demoulding station 5. The demoulding station 5 includes a driving device and a demoulding frame 11. The demoulding frame 11 has a slot 12 that cooperates with the bottleneck of the bottle body. The driving device includes a telescopic cylinder 23. The telescopic cylinder 23 contracts to make the demoulding frame 11 close to the workbench 2. When the workbench 2 descends, the formed bottle body on the mandrel group 21 cooperates with the slot 12 on the demoulding frame 11. The telescopic cylinder 23 extends to push the bottle body away from the mandrel group 21 so that it falls on the conveyor belt 10 for output, thereby realizing automatic transportation of the bottle body.

[0015] As a preferred option, Figure 2 As shown, it includes an air pump, and the driving device also includes a rotating mechanism. The demolding frame 11 is provided with an air channel connected to the air pump, the card slot 12 is semi-annular, and the card slot 12 is provided with an air port 13 connected to the air channel. When the air pump is running, the air port 13 can generate negative pressure to adsorb the bottle body. The demolding frame 11 is transferred to the bracket 14, and the bracket 14 is connected to the telescopic cylinder 23. The bracket 14 is provided with a motor 15 for driving the demolding frame 11 to flip back and forth. When the telescopic cylinder 23 is extended to push the bottle body away from the core rod group 21, the air pump generates negative pressure to adsorb the bottle body on the demolding frame 11. The motor 15 drives the demolding frame 11 to rotate 90 degrees, so that the bottle body stands on the conveyor belt 10. The air pump stops running, and the telescopic cylinder 23 contracts to realize the transportation of the bottle body standing on the conveyor belt 10, which is convenient for subsequent induction counting.

[0016] As a preference, an adjusting mechanism is provided on the conveyor belt 10, and baffles 16 connected to the adjusting mechanism are provided on both sides of the conveyor belt 10. The adjusting mechanism includes a vertical slide bar 17, a connecting member 18, and a horizontal slide bar 19. The vertical slide bar 17 is installed on the conveyor belt 10, the connecting member 18 is installed on the vertical slide bar 17, and the horizontal slide bar 19 is slidably connected to the connecting member 18 and connected to the baffle 16. The relative sliding of the horizontal slide bar 19 with respect to the connecting member 18 realizes the adjustment of the distance between the two baffles 16, and the relative up-and-down sliding of the vertical slide bar 17 with respect to the conveyor belt 10 or the relative up-and-down sliding of the connecting member 18 with respect to the vertical slide bar 17 realizes the adjustment of the height of the two baffles 16, which can adapt to the lateral limiting of bottle bodies of various specifications and prevent the bottle bodies from tipping over and falling.

[0017] As a preference, a height adjusting mechanism is provided at the bottom of the conveyor belt 10. The height adjusting mechanism can be a screw rod lifting mechanism 20 or the like to adjust the height of the conveyor belt 10 to adapt to the stable placement of bottle bodies of different heights.

Claims

1. A PET bottle production device, comprising a three-station injection blow molding machine, the three-station injection blow molding machine includes a machine base, a rotary worktable provided on the machine base, the worktable is provided with three mandrel groups arranged in an equilateral triangle at 120 degrees, and beside the worktable are respectively provided with a preform injection station, a blow molding station, and a demolding station that are arranged in a triangle and cooperate with the mandrel groups arranged in an equilateral triangle. The preform injection station and the blow molding station both include a fixed lower mold assembly, and an upper mold assembly that cooperates with the lower mold assembly and is driven to lift by a hydraulic press. It is characterized in that: It includes a lever mechanism, and a guide column is provided on the machine base in the vertical direction, which is slidably connected to the upper mold assembly. The lever mechanism is transferred to the machine base, one end is connected to the upper mold assembly, and the other end is connected to the hydraulic press. The hydraulic press pushes the upper mold assembly and the lower mold assembly through the lever mechanism, and the locking force is not less than 5 times the thrust of the hydraulic press.

2. The PET bottle production device according to claim 1, characterized in that: A conveyor belt is provided next to the demoulding station, and the demoulding station includes a driving device and a demoulding frame. The demoulding frame has a slot that matches the bottle body. The demoulding frame is driven to move back and forth by the driving device to transfer the bottle body on the core rod group to the conveyor belt.

3. The PET bottle production device according to claim 2, wherein: It includes an air pump, the driving device includes a rotating mechanism, the demoulding frame is provided with an air channel connected to the air pump, and the card slot is provided with an air port connected to the air channel. When the air pump is running, a negative pressure that absorbs the bottle body can be generated at the air port. The demoulding frame is driven to rotate by the rotating mechanism and with the cooperation of the air pump, the bottle body is transported upright on the conveyor belt.

4. The PET bottle production device according to claim 3, wherein: The conveyor belt is provided with an adjustment mechanism, and baffles connected to the adjustment mechanism are provided on both sides of the conveyor belt. The spacing and height of the baffles are adjusted by the adjustment mechanism.

5. The PET bottle production device according to claim 3 or 4, characterized in that: A height adjustment mechanism is provided at the bottom of the conveyor belt, and the height of the conveyor belt is adjusted by the height adjustment mechanism.

Images