Plastic forming machine head and servo adaptive plastic forming machine

Abstract

This invention discloses a plastic molding die head and a follow-up adaptive plastic molding machine, including a material cylinder with an open top. A material plug assembly is installed inside the material cylinder. The top of the material plug assembly extends from the top opening of the material cylinder and is connected to an injection cylinder. A die opening assembly is installed at the outlet of the material cylinder, and the die opening assembly is connected to a thickness adjustment device. Multiple pull rods passing through the material plug assembly are installed between the injection cylinder and the material cylinder. Multiple plastic flow channels are provided inside the material plug assembly, and multiple inlets corresponding to and communicating with the plastic flow channels are provided at the upper part of the material plug assembly. Under the premise of the same material cylinder specification, this structure can obtain a larger material plug stroke, thereby obtaining a larger material storage cavity, which is conducive to the miniaturization of injection molding equipment. The reduction in size also shortens the length of the plastic flow channels, improves the problem of healing lines in plastic products, and improves product quality.

Description

Technical Field

[0001] This invention relates to the field of injection molding equipment technology, and more particularly to a plastic molding die head and a follow-up adaptive plastic molding machine. Background Technology

[0002] In daily production and life, large plastic containers are frequently used. The injection molding process for large plastic containers involves relatively large machinery. During production, plastic raw materials are first extruded into the storage chamber of the material cylinder. During the injection process, the plug inside the material cylinder is pushed up and moved upward. When the plug reaches the top, the storage chamber is filled, and filling stops. The plug moves inside the material cylinder, and the stroke of the plug is the height of the material cylinder minus the height of the plug. In order to obtain more filler to make larger containers, the equipment needs to be made very large. Due to the limitations of the material cylinder and plug structure, in traditional plastic molding equipment, the extruder is fixedly connected to the material cylinder of the die head, and the material cylinder is also fixedly connected to the frame. Summary of the Invention

[0003] One of the technical problems to be solved by the present invention is to provide a compact plastic molding head.

[0004] To solve the above-mentioned technical problems, the technical solution of the present invention is: a plastic molding head, including a material cylinder with an open top, a material plug assembly installed inside the material cylinder, the top end of the material plug assembly extending from the top opening of the material cylinder and connected to an injection cylinder, a die opening assembly installed at the outlet of the material cylinder, and a thickness adjustment device connected to the die opening assembly; multiple pull rods passing through the material plug assembly are installed between the injection cylinder and the material cylinder.

[0005] The feed plug assembly has multiple plastic flow channels inside, and the upper part of the feed plug assembly has multiple feed inlets that are connected to the plastic flow channels.

[0006] As a preferred technical solution, the plug assembly includes a core sleeve and a plug outer body fitted together from the inside to the outside. At least one plug inner body is disposed between the core sleeve and the plug outer body. The plastic flow channel is disposed between the plug outer body and the plug inner body, between two adjacent plug inner bodies, or between the plug inner body and the core sleeve. An outer guide sleeve is connected to the bottom end of the core sleeve, and the outer guide sleeve is connected to the mold assembly.

[0007] A feed body is installed at the top of the outer body of the feed plug, and the feed port is provided on the feed body. A transverse plastic channel is provided between each feed port and the corresponding plastic flow channel, which passes through the feed body, the outer body of the feed plug and / or the inner body of the feed plug in sequence.

[0008] As a preferred technical solution, the top of the material plug assembly is connected to a top plate via multiple push rods, and the piston rod of the injection cylinder extends outward and is connected to the top plate in a driving connection.

[0009] As a preferred technical solution, the die assembly includes a die installed at the discharge port of the material cylinder, a core die installed inside the die, and the core die being connected to the thickness adjustment device.

[0010] As a preferred technical solution, the thickness adjustment device includes a core lifting rod whose bottom end is connected to the die opening assembly and whose top end passes sequentially through the material plug assembly, the material injection cylinder and the thickness adjustment cylinder. The bottom of the core lifting rod is fitted with an inner guide sleeve connected to the material plug assembly, and the top end of the core lifting rod is connected to the piston of the thickness adjustment cylinder.

[0011] By adopting the above technical solution, a plastic molding head includes a material cylinder with an open top. A material plug assembly is installed inside the material cylinder. The top of the material plug assembly extends from the top opening of the material cylinder and is connected to an injection cylinder. A die opening assembly is installed at the outlet of the material cylinder, and the die opening assembly is connected to a thickness adjustment device. Multiple pull rods passing through the material plug assembly are installed between the injection cylinder and the material cylinder. Multiple plastic flow channels are provided inside the material plug assembly, and multiple inlets corresponding to and communicating with the plastic flow channels are provided at the upper part of the material plug assembly. Under the premise of the same material cylinder specification, this structure can obtain a larger material plug stroke, thereby obtaining a larger material storage cavity, which is conducive to the miniaturization of injection molding equipment. The reduction in size also shortens the length of the plastic flow channels, improves the problem of healing lines in plastic products, and improves product quality.

[0012] Another technical problem to be solved by the present invention is to provide a compact follow-up adaptive plastic molding machine.

[0013] To solve the above-mentioned technical problems, the technical solution of the present invention is: a follow-up adaptive plastic molding machine, including a frame, an extruder mounting plate mounted on the frame, a plurality of extruders mounted on the extruder mounting plate, and a rolling support device installed between the extruder mounting plate and the frame; a plastic molding die head as described in claim 1 is rotatably mounted on the frame, and the discharge end of the extrusion screw of the extruder is respectively fixedly connected to the feed port of the plastic molding die head;

[0014] The rolling support device includes a roller rotatably mounted on the bottom end face of the extruder mounting plate, and the axial direction of the roller is perpendicular to the axial direction of the extrusion screw.

[0015] Support components are symmetrically installed on the outer wall of the material cylinder of the plastic molding head. Insert blocks are rotatably connected to the support components, and insertion slots that cooperate with the insert blocks are provided on the frame.

[0016] As a preferred technical solution, two bearing seats are fixedly installed on the bottom end face of the extruder mounting plate, and the two ends of the roller are rotatably connected to the two bearing seats respectively. A rotating bearing is installed between the end of the roller and the bearing seat.

[0017] As a preferred technical solution, a pad is installed between the roller and the frame.

[0018] As a preferred technical solution, the support assembly includes a cylinder connector fixedly mounted on the cylinder, a support shaft mounted on the cylinder connector, an insert block rotatably mounted on the support shaft, and a rotating bearing installed between the support shaft and the insert block.

[0019] As a preferred technical solution, the insert block is a square insert block.

[0020] By adopting the above technical solution, this follow-up adaptive plastic molding machine uses the plastic molding head described above, and makes corresponding improvements to the mechanism of the plastic molding head, resulting in a compact and miniaturized plastic molding machine that saves costs. Attached Figure Description

[0021] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:

[0022] Figure 1 This is a schematic diagram of the structure of the plastic molding machine head in the empty state according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the plastic molding machine head in a full-material state according to an embodiment of the present invention;

[0024] Figure 3 This is a top view of the adaptive plastic molding machine according to an embodiment of the present invention;

[0025] Figure 4 This is a cross-sectional view of the following adaptive plastic molding machine rolling support device according to an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the material empty state of the follow-up adaptive plastic molding machine according to an embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the following adaptive plastic molding machine in the full material state according to an embodiment of the present invention;

[0028] In the diagram: 11-Material cylinder; 12-Injection cylinder; 13-Pull rod; 21-Core sleeve; 22-Inner body of the material plug; 23-Outer body of the material plug; 24-Inner layer plastic flow channel; 25-Outer layer plastic flow channel; 26-Outer guide sleeve; 27-Feed body; 28-Inner layer transverse plastic channel; 29-Outer layer transverse plastic channel; 31-Ejector rod; 32-Top plate; 41-Die; 42-Pressure ring; 43-Core mold; 51-Thickness adjustment cylinder; 52-Core lifting rod; 53-Inner guide sleeve; 61-Frame; 62-Extruder; 63-Extruder mounting plate; 64-Extrusion screw; 71-Roller; 72-Shaft seat; 73-Pad plate; 81-Insertion block; 82-Material cylinder connector; 83-Support shaft. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the following detailed description, only certain exemplary embodiments of the invention are described by way of illustration. Undoubtedly, those skilled in the art will recognize that various modifications can be made to the described embodiments without departing from the spirit and scope of the invention. Therefore, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

[0030] like Figure 1 and Figure 2 As shown, a plastic molding head includes a material cylinder 11 with an open top. A material plug assembly is installed inside the material cylinder 11. The top of the material plug assembly extends from the top opening of the material cylinder 11 and is connected to an injection cylinder 12. A die opening assembly is installed at the outlet of the material cylinder 11, and the die opening assembly is connected to a thickness adjustment device. Multiple pull rods 13 are installed between the injection cylinder 12 and the material cylinder 11, passing through the material plug assembly. Multiple plastic flow channels are provided inside the material plug assembly, and multiple feed ports corresponding to and communicating with the plastic flow channels are provided at the upper part of the material plug assembly.

[0031] The plug assembly includes a core sleeve 21 and a plug outer body 23 fitted together from the inside out. At least one plug inner body 22 is disposed between the core sleeve 21 and the plug outer body 23. The plastic flow channel is disposed between the plug outer body 23 and the plug inner body 22, between two adjacent plug inner bodies 22, or between the plug inner body 22 and the core sleeve 21. The bottom end of the core sleeve 21 is connected to an outer guide sleeve 26, which is connected to the mold assembly.

[0032] The top of the outer body 23 of the feed plug is equipped with a feed body 27, and the feed port is provided on the feed body 27. Each feed port and the corresponding plastic flow channel are provided with a transverse plastic channel that passes through the feed body 27, the outer body 23 of the feed plug and / or the inner body 22 of the feed plug in sequence.

[0033] Taking a molding head for producing double-walled plastic containers as an example, the plug assembly includes a core sleeve 21, a plug inner body 22, and a plug outer body 23, which are fitted together from the inside out. The two plastic flow channels include an inner plastic flow channel 24 and an outer plastic flow channel 25. The outer plastic flow channel 25 is located between the plug outer body 23 and the plug inner body 22, and the inner plastic flow channel 24 is located between the plug inner body 22 and the core sleeve 21. An outer guide sleeve 26 is connected to the bottom end of the core sleeve 21. 26 is connected to the mold assembly; a feed body 27 is installed at the top of the outer body 23 of the material plug, and the feed port is located on the feed body 27. An inner transverse plastic channel 28 is provided between the feed port of the inner plastic layer and the inner plastic flow channel 24, passing through the feed body 27, the outer body 23 of the material plug, and the inner body 22 of the material plug in sequence; an outer transverse plastic channel 29 is provided between the feed port of the outer plastic layer and the outer plastic flow channel 25, passing through the feed body 27 and the outer body 23 of the material plug in sequence. The top of the material plug assembly is connected to a top plate 32 through multiple push rods 31, and the piston rod of the injection cylinder 12 extends outward and is drivenly connected to the top plate 32.

[0034] The die assembly includes a die 41 installed at the outlet of the material cylinder 11, and a pressure ring 42 installed on the material cylinder 11 to press the die 41. A core mold 43 is installed inside the die 41, and the core mold 43 is connected to the thickness adjustment device. The thickness adjustment device includes a core lifting rod 52 whose bottom end is connected to the die assembly and whose top end passes through the material plug assembly, the injection cylinder 12, and the thickness adjustment cylinder 51 in sequence. The bottom of the core lifting rod 52 is fitted with an inner guide sleeve 53 connected to the material plug assembly, and the top end of the inner guide sleeve 53 extends into the outer guide sleeve 26 of the material plug assembly and is slidably connected to the outer guide sleeve 26. Both the inner guide sleeve 53 and the outer guide sleeve 26 are made of wear-resistant material. The top end of the core lifting rod 52 is connected to the piston of the thickness adjustment cylinder 51. When the thickness adjustment cylinder 51 controls the core lifting rod 52 to move downward, the gap between the die 41 and the core die 43 becomes larger, and the blank coming out of the die assembly becomes thicker, and vice versa.

[0035] The core-lifting rod 52 is centrally located, extending from the bottom core mold 43 of the plastic molding head to the top of the head. The pull rod 13 connects the injection cylinder 12 and the material cylinder 11. Multiple pull rods are symmetrically distributed circumferentially around the core-lifting rod 52. The two ends of the pull rod 13 are fixedly connected to the flanges of the injection cylinder 12 and the material cylinder 11, respectively. The multiple push rods 31 between the top plate 32 and the piston assembly are also symmetrically distributed circumferentially around the core-lifting rod 52.

[0036] The material cylinder 11 adopts an open-top structure, with the top of the plug assembly extending out from inside the material cylinder 11. During operation, as long as the bottom of the plug assembly is always lower than the upper opening of the material cylinder 11, the stroke of the plug is basically the same as the longitudinal length of the material cylinder 11. Compared with the traditional closed material cylinder 11 (the closed material cylinder 11 structure will cause the plug stroke to be only the longitudinal length of the material cylinder 11 minus the longitudinal length of the plug), a larger plug stroke can be obtained through a more miniaturized mechanism, thus realizing the miniaturization of the injection molding equipment.

[0037] During operation, the flowing plastic raw material enters the corresponding transverse channel from the feed port, and then enters the corresponding plastic flow channel through the transverse channel. The two layers of plastic raw material merge in the material cavity of the material cylinder 11. As the amount of plastic raw material in the material cavity increases, the material plug assembly moves upward. When the material cavity is full, the injection cylinder 12 is activated. The injection cylinder 12 drives the material plug assembly to move downward, extruding the plastic raw material from the die assembly to form a blank. After being squeezed by the die 41 and the core die 43, it enters the mold below the die head and then enters the blow molding process.

[0038] like Figures 1 to 6 As shown, a follow-up adaptive plastic molding machine includes a frame 61, on which an extruder mounting plate 63 is mounted. Multiple extruders 62 are mounted on the extruder mounting plate 63. A rolling support device is installed between the extruder mounting plate 63 and the frame 61. The aforementioned plastic molding head is rotatably mounted on the frame 61. The discharge ends of the extrusion screws 64 of the extruders 62 are respectively fixedly connected to the feed inlets of the plastic molding head. The rolling support device includes rollers 71 rotatably mounted on the bottom surface of the extruder mounting plate 63, with the axial direction of the rollers 71 perpendicular to the axial direction of the extrusion screws 64. Support components are symmetrically mounted on the outer wall of the material cylinder 11 of the plastic molding head. Insertion blocks 81 are rotatably connected to the support components. The frame 61 is provided with insertion slots that mate with the insertion blocks 81.

[0039] Two bearing seats 72 are fixedly mounted on the bottom surface of the extruder mounting plate 63. Both ends of the roller 71 are rotatably connected to the two bearing seats 72, and a rotary bearing is installed between the end of the roller 71 and the bearing seat 72. A pad 73 is installed between the roller 71 and the frame 61. The support assembly includes a cylinder connector 82 fixedly mounted on the cylinder 11, a support shaft 83 mounted on the cylinder connector 82, and an insert block 81 rotatably mounted on the support shaft 83. A rotary bearing is installed between the support shaft 83 and the insert block 81. The insert block 81 is a square insert block 81.

[0040] When the material storage chamber 11 of the plastic molding head is empty, the material plug assembly moves downward, which in turn moves the discharge end of the extrusion screw 64 connected to it downward. Because the extrusion screw 64 is vertically fixed to the molding head, in order to accommodate the position change of the material plug assembly, the support shaft 83 connected to the molding head will rotate within the insert block 81 to adjust the angle of the molding head. At the same time, the extruder mounting plate 63 and the pad plate 73 will also be tilted around the roller 71 to accommodate the angle change of the extrusion screw 64. When the material storage chamber 11 of the material cylinder 11 is full of raw material, the material plug assembly moves upward to the highest position. At this time, the molding head is in a vertical state and the extrusion screw 64 is in a horizontal state.

[0041] Specific working process: With the material cylinder 11 empty, the extruder 62 operates. As more plastic is added, the feed plug assembly is lifted until the cylinder is full. During this process, the rising feed plug assembly causes the front end of the extruder 62 to rise, i.e., the front end of the extrusion screw 64 rises. The tilt angle of the forming head is automatically adjusted by the rotating insert block 81. The vertical angle and front-back position of the extruder 62 are automatically adjusted by the rolling support device under the extruder mounting plate 63. After the cylinder is full, feeding begins, and the descending feed plug assembly causes the front end of the extruder 62 to descend. The tilt angle of the forming head is automatically adjusted by the rotating insert block 81. The vertical angle and front-back position of the extruder 62 are automatically adjusted by the rolling support device under the extruder mounting plate 63.

[0042] If plastic enters the storage chamber through a long plastic flow channel, a healing line will appear where the plastics meet. Because of the reduction in the diameter and volume of the material cylinder 11, this structure can reduce the length that the plastic travels into the storage chamber, which can effectively solve the problem of healing lines in plastic products.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A plastic molding head, characterized in that: The device includes a material cylinder with an opening at the top, a material plug assembly installed inside the material cylinder, the top of the material plug assembly extending from the top opening of the material cylinder and connected to an injection cylinder, a die opening assembly installed at the outlet of the material cylinder, and a thickness adjustment device connected to the die opening assembly; multiple pull rods passing through the material plug assembly are installed between the injection cylinder and the material cylinder. The feed plug assembly is provided with multiple plastic flow channels, and the upper part of the feed plug assembly is provided with multiple feed inlets that are connected to the plastic flow channels. During operation, the bottom of the feed plug assembly is always lower than the top opening of the feed cylinder. The plug assembly includes a core sleeve and a plug outer body that are fitted together from the inside out. At least one plug inner body is disposed between the core sleeve and the plug outer body. The plastic flow channel is disposed between the plug outer body and the plug inner body, between two adjacent plug inner bodies, or between the plug inner body and the core sleeve. An outer guide sleeve is connected to the bottom end of the core sleeve, and the outer guide sleeve is connected to the mold assembly. A feed body is installed at the top of the outer body of the feed plug, and the feed inlet is provided on the feed body. A transverse plastic channel is provided between each feed inlet and the corresponding plastic flow channel, which passes through the feed body, the outer body of the feed plug and / or the inner body of the feed plug in sequence. The top of the feed plug assembly is connected to a top plate via multiple push rods, and the piston rod of the injection cylinder extends outward and is connected to the top plate in a driving connection.

2. The plastic molding head as described in claim 1, characterized in that: The die assembly includes a die installed at the discharge port of the material cylinder, a core die installed inside the die, and the core die connected to the thickness adjustment device.

3. The plastic molding head as described in claim 1 or 2, characterized in that: The thickness adjustment device includes a core lifting rod whose bottom end is connected to the die opening assembly and whose top end passes sequentially through the material plug assembly, the material injection cylinder, and the thickness adjustment cylinder. The bottom of the core lifting rod is fitted with an inner guide sleeve connected to the material plug assembly, and the top end of the core lifting rod is connected to the piston of the thickness adjustment cylinder.

4. A follow-up adaptive plastic molding machine, comprising a frame, characterized in that: An extruder mounting plate is installed on the frame, and multiple extruders are mounted on the extruder mounting plate. A rolling support device is installed between the extruder mounting plate and the frame. A plastic molding head as described in claim 1 is rotatably mounted on the frame, and the discharge end of the extrusion screw of the extruder is fixedly connected to the feed port of the plastic molding head. The rolling support device includes a roller rotatably mounted on the bottom end face of the extruder mounting plate, and the axial direction of the roller is perpendicular to the axial direction of the extrusion screw. Support components are symmetrically installed on the outer wall of the material cylinder of the plastic molding head. Insert blocks are rotatably connected to the support components, and insertion slots that cooperate with the insert blocks are provided on the frame.

5. The follow-up adaptive plastic molding machine as described in claim 4, characterized in that: Two bearing seats are fixedly installed on the bottom end face of the extruder mounting plate. The two ends of the roller are rotatably connected to the two bearing seats respectively, and a rotating bearing is installed between the end of the roller and the bearing seat.

6. The follow-up adaptive plastic molding machine as described in claim 4, characterized in that: A pad is installed between the roller and the frame.

7. The follow-up adaptive plastic molding machine as described in claim 4, characterized in that: The support assembly includes a cylinder connector fixedly mounted on the cylinder, a support shaft mounted on the cylinder connector, an insert block rotatably mounted on the support shaft, and a rotating bearing installed between the support shaft and the insert block.

8. The follow-up adaptive plastic molding machine as described in any one of claims 4-7, characterized in that: The insert block is a square insert block.

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