Rotary injection molding device for plastic production

Abstract

The invention discloses a rotary injection molding device for plastic production, and belongs to the technical field of plastic injection. Comprising a frame body mechanism, and the frame body mechanism is provided with an injection mechanism used for plastic injection and a mold mechanism used for plastic forming; by arranging the rotatable mold frame and the double-mold alternate working structure, one mold can be cooled and demolded while the other mold can be synchronously subjected to injection molding, so that the production period is greatly shortened, and the equipment utilization rate is increased; the injection mechanism with the conical head matched with the one-way ring is adopted, secondary compaction is conducted before plastic melt enters the mold, it is guaranteed that plastic is fully filled, the defects of bubbles and material shortage are reduced, and the product forming quality is improved; according to the invention, the two lower molds can be configured with different cavities, and are matched with the independent discharging slopes, so that alternate production and classified collection of different plastic parts are realized, and the customization requirements of multiple varieties and small batches are met.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic injection, in particular to a rotary injection molding device for plastic production. Background Art

[0002] Plastic injection molding technology is one of the important processes in the current production of plastic products. It injects molten plastic into the mold cavity, and obtains plastic parts of the desired shape after cooling and solidification. Traditional injection molding equipment usually adopts a fixed mold structure, which has limited production efficiency and makes it difficult to achieve alternating production of multiple varieties of plastic parts on the same equipment. In addition, there is still room for optimization of ordinary injection molding devices in terms of injection density, cooling efficiency and demolding automation. In the existing technology, some rotary injection molding equipment improves production efficiency by setting a rotatable mold rack. However, these devices are often complex in structure, lack mold switching accuracy, and it is difficult to achieve independent control of different molds, resulting in low production flexibility. At the same time, the demolding process of traditional equipment mostly relies on manual or simple mechanical ejection, which can easily affect the production rhythm and may cause product damage. Therefore, there is an urgent need for a rotary injection molding device with a reasonable structure, a high degree of automation, flexible mold switching and improved injection density to meet the efficient production needs of diversified plastic parts. Summary of the Invention

[0003] In response to the above technical problems, the technical solution adopted by the present invention is: a rotary injection molding device for plastic production, including a frame mechanism, the frame mechanism includes a base, a slide is slidably mounted on the base, and the frame mechanism is provided with an injection mechanism for plastic injection and a mold mechanism for plastic molding.

[0004] Furthermore, the frame mechanism includes two demoulding electric cylinders fixedly mounted on a base, and two discharge slopes are provided on the base.

[0005] Furthermore, the injection mechanism includes an injection molding frame fixedly mounted on the base, an injection molding motor and an injection frame fixedly mounted on the injection molding frame, a feed barrel fixedly mounted on the injection molding frame, an injection molding gear fixedly mounted on the motor shaft of the injection molding motor, a docking block fixedly mounted on the injection frame, and four heaters arranged outside the injection frame.

[0006] Furthermore, two upper molds are fixedly installed on the injection molding frame, a sliding plate is fixedly installed on the output end of the upper mold, a conveying shaft is rotatably installed on the sliding plate, a conveying gear is fixedly installed on the conveying shaft, the conveying gear is engaged with the injection molding gear, and the conveying shaft is located in the injection frame.

[0007] Furthermore, a cone head is fixedly installed at the end of the conveying shaft, four output grooves are provided on the cone head, and a one-way ring is slidably installed on the cone head.

[0008] Put the plastic granules into the feed barrel and they fall onto the conveying shaft. The injection motor drives the injection gear to rotate, which drives the conveying gear and the conveying shaft to rotate. The plastic granules are conveyed through the conveying shaft and melted by the heater. When the melted plastic reaches the one-way ring, the plastic pushes the one-way ring to slide relative to the conveying shaft, and then the plastic enters the output groove, and then the plastic enters between the docking block and the lower mold. Then the upper mold contracts, driving the sliding plate, the conveying shaft and the cone head to move toward the docking block. The cone head applies pressure to the plastic in the docking block, and the plastic between the docking block and the lower mold is compacted to increase the density of the plastic injection. At this time, the one-way ring slides along the cone head to reset.

[0009] Furthermore, the mold mechanism includes a motor fixedly mounted on a slide, a motor gear fixedly mounted on the motor shaft of the motor, an eccentric wheel rotatably mounted on the slide, a large gear and a side bevel gear fixedly mounted on the eccentric wheel, the large gear meshes with the motor gear, a rotating rod eccentrically rotatably mounted on the eccentric wheel, the rotating rod is rotatably mounted on the base, a gear shaft rotatably mounted on the slide, a spur bevel gear and an upper gear fixedly mounted on the gear shaft, the spur bevel gear meshes with the side bevel gear.

[0010] Furthermore, a mold frame is rotatably mounted on the slide, a mold frame gear is fixedly mounted on the mold frame, the mold frame gear is engaged with the upper gear, two mold frames are fixedly mounted on the mold frame, a lower mold is slidably mounted in the mold frame, the interior of the lower mold is a hollow structure, two water inlet pipes are provided on the lower mold, the water inlet pipes are connected to the external water pipes, and the water inlet pipes are connected to the empty space inside the lower mold.

[0011] Furthermore, a docking electric cylinder is fixedly installed on the mold frame, a docking frame is fixedly installed on the output end of the docking electric cylinder, the lower mold is fixedly installed on the docking frame, a stripping plate is slidably installed on the lower mold, a reset spring is provided between the stripping plate and the lower mold, and multiple ejector rods are fixedly installed on the stripping plate, and the ejector rods are slidably installed with the lower mold.

[0012] After the plastic injection is completed, the cold water in the lower mold quickly cools the completed plastic part. The docking cylinder then extends, driving the docking frame and the lower mold away from the docking block, and the lower mold leaves the docking block with the plastic part. The motor then drives the motor gear to rotate, driving the large gear, eccentric wheel, and side bevel gear to rotate. The rotation of the eccentric wheel cooperates with the rotating rod and the base, driving the slide to slide along the base. The side bevel gear drives the spur bevel gear, gear shaft, and upper gear to rotate, thereby driving the mold frame gear and mold frame to rotate. The motor starts once, driving the slide to move outward and then inward to return to its initial position. At the same time, the mold frame rotates 90 degrees. The lower mold with the completed plastic part reaches the discharge slope. The other lower mold moves to the docking block. The docking cylinder then retracts, allowing the other lower mold to dock with the docking block, preparing for the next plastic injection. The demoulding cylinder extends, pushing the stripper plate on the lower mold carrying the plastic part. The return spring is compressed, and the ejector rod pushes the plastic part on the lower mold onto the discharge slope. The plastic part is then pulled out along the discharge slope for collection, and this cycle repeats.

[0013] The two lower molds can use different molds to produce different plastic parts, and each lower mold corresponds to a different discharge slope, so that the plastic parts produced by different lower molds can be collected separately. Moreover, through separate control, plastic injection can be stopped when any lower mold is docked with the docking block, so as to process different quantities of different plastic parts.

[0014] Compared with the prior art, the present invention has the following advantages: (1) By providing a rotatable mold rack and a dual-mold alternating working structure, the present invention enables one mold to be cooled and demolded while the other mold can be injection molded simultaneously, thereby significantly shortening the production cycle and improving equipment utilization; (2) The present invention adopts an injection mechanism in which a cone head and a one-way ring are combined to perform secondary compaction before the plastic melt enters the mold, thereby ensuring that the plastic is fully filled, reducing bubbles and material defects, and improving product molding quality; (3) The present invention provides two lower molds with different cavities, and cooperates with independent discharge slopes to achieve alternating production and classified collection of different plastic parts, meeting the customized needs of multiple varieties and small batches; (4) The present invention realizes automatic switching, precise positioning and demolding and ejection of molds through electric cylinders, gear transmission and eccentric wheel mechanisms, reducing manual intervention, reducing labor intensity, and improving production stability and consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 It is a schematic diagram of the frame structure of the present invention.

[0017] Figure 3 Schematic diagram of the injection mechanism structure of the present invention Figure 1 .

[0018] Figure 4 Schematic diagram of the injection mechanism structure of the present invention Figure 2 .

[0019] Figure 5 Schematic diagram of the injection mechanism structure of the present invention Figure 3 .

[0020] Figure 6 Schematic diagram of the injection mechanism structure of the present invention Figure 4 .

[0021] Figure 7 Schematic diagram of the mold structure of the present invention Figure 1 .

[0022] Figure 8 Schematic diagram of the mold structure of the present invention Figure 2 .

[0023] Figure 9 Schematic diagram of the mold structure of the present invention Figure 3 .

[0024] Figure 10 Schematic diagram of the mold structure of the present invention Figure 4 .

[0025] Figure 11 Schematic diagram of the mold structure of the present invention Figure 5 .

[0026] Reference numerals: 101-base; 102-slide; 103-ejection cylinder; 104-discharging slope; 201-injection frame; 202-injection motor; 203-injection gear; 204-feed barrel; 205-injection frame; 206-heater; 207-docking block; 208-upper mold; 209-sliding plate; 210-conveying gear; 211-conveying shaft; 212-one-way ring; 213-cone head; 214-output slot; 301 -motor; 302-motor gear; 303-large gear; 304-eccentric wheel; 305-rotating rod; 306-side bevel gear; 307-gear shaft; 308-spur bevel gear; 309-upper gear; 310-mold frame; 311-mold frame gear; 312-mold frame; 313-lower mold; 314-docking frame; 315-docking electric cylinder; 316-water inlet pipe; 317-stripping plate; 318-reset spring; 319-ejection rod. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0028] Among them, the drawings are only used for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting this patent; in order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0029] Example: Figures 1-11 As shown, a rotary injection molding device for plastic production includes a frame mechanism, the frame mechanism includes a base 101, a slide 102 is slidably mounted on the base 101, and an injection mechanism for plastic injection and a mold mechanism for plastic molding are provided on the frame mechanism.

[0030] like Figure 2 As shown, the frame mechanism includes two demoulding electric cylinders 103 fixedly mounted on a base 101 , and two discharge slopes 104 are provided on the base 101 .

[0031] like Figure 3-Figure 6 As shown, the injection mechanism includes an injection molding frame 201 fixedly mounted on the base 101, an injection molding motor 202 and an injection frame 205 fixedly mounted on the injection molding frame 201, a feed barrel 204 fixedly mounted on the injection frame 205, an injection molding gear 203 fixedly mounted on the motor shaft of the injection molding motor 202, a docking block 207 fixedly mounted on the injection frame 205, and four heaters 206 are arranged outside the injection frame 205.

[0032] like Figure 3-Figure 6 As shown, two upper molds 208 are fixedly installed on the injection molding frame 201, a sliding plate 209 is fixedly installed on the output end of the upper mold 208, a conveying shaft 211 is rotatably installed on the sliding plate 209, a conveying gear 210 is fixedly installed on the conveying shaft 211, the conveying gear 210 is engaged with the injection molding gear 203, and the conveying shaft 211 is located in the injection frame 205.

[0033] like Figure 3-Figure 6 As shown, a cone head 213 is fixedly mounted on the end of the conveying shaft 211 , four output grooves 214 are provided on the cone head 213 , and a one-way ring 212 is slidably mounted on the cone head 213 .

[0034] Plastic particles are put into the feed barrel 204 and fall onto the conveying shaft 211. The injection motor 202 drives the injection gear 203 to rotate, driving the conveying gear 210 and the conveying shaft 211 to rotate, and the plastic particles are conveyed by the conveying shaft 211. The plastic particles are heated and melted by the heater 206. When the melted plastic reaches the one-way ring 212, the plastic pushes the one-way ring 212 to slide relative to the conveying shaft 211, and then the plastic enters the output groove 214. Then the plastic enters between the docking block 207 and the lower mold 313. Then the upper mold 208 contracts, driving the sliding plate 209, the conveying shaft 211 and the cone head 213 to move toward the docking block 207. The cone head 213 applies pressure to the plastic in the docking block 207, and the plastic between the docking block 207 and the lower mold 313 is compacted to improve the plastic injection density. At this time, the one-way ring 212 slides along the cone head 213 to reset.

[0035] like Figure 7-11 As shown, the mold mechanism includes a motor 301 fixedly mounted on the slide 102, a motor gear 302 fixedly mounted on the motor shaft of the motor 301, an eccentric wheel 304 rotatably mounted on the slide 102, a large gear 303 and a side bevel gear 306 fixedly mounted on the eccentric wheel 304, the large gear 303 is engaged with the motor gear 302, a rotating rod 305 is eccentrically rotatably mounted on the eccentric wheel 304, the rotating rod 305 is rotatably mounted on the base 101, a gear shaft 307 is rotatably mounted on the slide 102, a spur bevel gear 308 and an upper gear 309 are fixedly mounted on the gear shaft 307, and the spur bevel gear 308 is engaged with the side bevel gear 306.

[0036] like Figure 7-11 As shown, a mold rack 310 is rotatably mounted on the slide 102, a mold rack gear 311 is fixedly mounted on the mold rack 310, the mold rack gear 311 is engaged with the upper gear 309, two mold frames 312 are fixedly mounted on the mold rack 310, a lower mold 313 is slidably mounted in the mold frame 312, the interior of the lower mold 313 is a hollow structure, two water inlet pipes 316 are provided on the lower mold 313, the water inlet pipes 316 are connected to the external water pipe, and the water inlet pipes 316 are communicated with the hollow interior of the lower mold 313.

[0037] like Figure 7-11 As shown, a docking electric cylinder 315 is fixedly installed on the mold frame 310, a docking frame 314 is fixedly installed on the output end of the docking electric cylinder 315, the lower mold 313 is fixedly installed on the docking frame 314, a stripping plate 317 is slidably installed on the lower mold 313, a return spring 318 is provided between the stripping plate 317 and the lower mold 313, a plurality of ejector rods 319 are fixedly installed on the stripping plate 317, and the ejector rods 319 are slidably installed with the lower mold 313.

[0038] After the plastic injection is completed, the cold water in the lower mold 313 is used to quickly cool the finished plastic parts. Then the docking electric cylinder 315 extends, driving the docking frame 314 and the lower mold 313 away from the docking block 207, and the lower mold 313 takes the plastic parts away from the docking block 207. Then the motor 301 drives the motor gear 302 to rotate, driving the large gear 303, the eccentric wheel 304 and the side bevel gear 306 to rotate. The rotation of the eccentric wheel 304 cooperates with the base 101 through the rotating rod 305, driving the slide 102 to slide along the base 101. The side bevel gear 306 drives the spur bevel gear 308, the gear shaft 307 and the upper gear 309 to rotate, thereby driving the mold frame gear 311 and the mold frame 310 to rotate. 301 starts once, driving the slide 102 to move outward first and then inward to return to the initial position. At the same time, the mold frame 310 rotates ninety degrees, and the lower mold 313 brings the completed plastic parts to the discharge slope 104. The other lower mold 313 moves to the side of the docking block 207. Then the docking electric cylinder 315 contracts, so that the other lower mold 313 docks with the docking block 207, preparing for the next plastic injection. The demoulding electric cylinder 103 extends, pushing the stripping plate 317 on the lower mold 313 carrying the plastic parts. The return spring 318 is compressed, and the plastic parts on the lower mold 313 are pushed onto the discharge slope 104 through the ejector rod 319. Then the plastic parts are drawn out along the discharge slope 104 for collection, and this cycle repeats.

[0039] The two lower molds 313 can use different molds to produce different plastic parts, and each lower mold 313 corresponds to a different discharge slope 104, so that the plastic parts produced by different lower molds 313 can be collected separately, and through separate control, plastic injection can be omitted when any lower mold 313 is docked with the docking block 207, so as to process different quantities of different plastic parts.

[0040] The working principle of a rotary injection molding device for plastic production disclosed in the present invention is as follows: plastic particles are put into the feed barrel 204, and the plastic particles fall onto the conveying shaft 211. The injection motor 202 drives the injection gear 203 to rotate, driving the conveying gear 210 and the conveying shaft 211 to rotate, and the plastic particles are conveyed by the conveying shaft 211. The plastic particles are heated and melted by the heater 206. When the melted plastic reaches the one-way ring 212, the plastic pushes the one-way ring 212 to slide relative to the conveying shaft 211, and then the plastic enters the output groove 214. Then the plastic enters between the docking block 207 and the lower mold 313. Then the upper mold 208 contracts, driving the sliding plate 209, the conveying shaft 211 and the cone head 213 to move toward the docking block 207. The cone head 213 applies pressure to the plastic in the docking block 207, and the plastic between the docking block 207 and the lower mold 313 is compacted to improve the injection density of the plastic. At this time, the one-way ring 212 slides along the cone head 213 to reset. After the plastic injection is completed, the cold water in the lower mold 313 is used to quickly cool the finished plastic parts. Then the docking electric cylinder 315 extends, driving the docking frame 314 and the lower mold 313 away from the docking block 207, and the lower mold 313 takes the plastic parts away from the docking block 207. Then the motor 301 drives the motor gear 302 to rotate, driving the large gear 303, the eccentric wheel 304 and the side bevel gear 306 to rotate. The rotation of the eccentric wheel 304 cooperates with the base 101 through the rotating rod 305, driving the slide 102 to slide along the base 101. The side bevel gear 306 drives the positive bevel gear 308, the gear shaft 307 and the upper gear 309 to rotate, thereby driving the mold frame gear 311 and the mold frame 310 to rotate. The motor 301 is started once, driving the slide 102 to move outward first The movement then moves inward back to the initial position, while the mold frame 310 rotates ninety degrees, and the lower mold 313 brings the completed plastic parts to the discharge slope 104. The other lower mold 313 moves to the side of the docking block 207, and then the docking electric cylinder 315 contracts, so that the other lower mold 313 docks with the docking block 207, preparing for the next plastic injection, and the demoulding electric cylinder 103 extends, pushing the stripping plate 317 on the lower mold 313 carrying the plastic parts, the return spring 318 is compressed, and the plastic parts on the lower mold 313 are pushed onto the discharge slope 104 through the ejector rod 319, and then the plastic parts are drawn out along the discharge slope 104 for collection, and this reciprocating cycle is repeated.

[0041] The present invention is not limited to the above-mentioned specific implementation methods. Various changes made by technicians in the relevant technical field based on the above-mentioned conception without creative work are all within the scope of protection of the present invention.

Claims

1. A rotational injection molding device for plastic production, comprising a frame mechanism, characterized in that: The frame mechanism comprises a base (101), a slide seat (102) is slidably mounted on the base (101), and an injection mechanism for plastic injection and a mold mechanism for plastic molding are provided on the frame mechanism.

2. A rotational injection molding device for plastic production according to claim 1, characterized in that: The frame mechanism comprises two demoulding electric cylinders (103) fixedly mounted on a base (101), and two discharge slopes (104) are provided on the base (101).

3. A rotational injection molding device for plastic production according to claim 1, characterized in that: The injection mechanism comprises an injection frame (201) fixedly mounted on a base (101), an injection motor (202) and an injection frame (205) fixedly mounted on the injection frame (201), a feed barrel (204) fixedly mounted on the injection frame (205), an injection gear (203) fixedly mounted on the motor shaft of the injection motor (202), a docking block (207) fixedly mounted on the injection frame (205), and four heaters (206) arranged outside the injection frame (205).

4. A rotational injection molding device for plastic production according to claim 3, characterized in that: Two upper molds (208) are fixedly mounted on the injection molding frame (201), a sliding plate (209) is fixedly mounted on the output end of the upper mold (208), a conveying shaft (211) is rotatably mounted on the sliding plate (209), a conveying gear (210) is fixedly mounted on the conveying shaft (211), the conveying gear (210) is meshed with the injection molding gear (203), and the conveying shaft (211) is located in the injection molding frame (205).

5. A rotational injection molding device for plastic production according to claim 4, characterized in that: A cone head (213) is fixedly mounted on the end of the conveying shaft (211), four output grooves (214) are provided on the cone head (213), and a one-way ring (212) is slidably mounted on the cone head (213).

6. A rotational injection molding device for plastic production according to claim 1, characterized in that: The mold mechanism comprises a motor (301) fixedly mounted on a slide (102), a motor gear (302) fixedly mounted on a motor shaft of the motor (301), an eccentric wheel (304) rotatably mounted on the slide (102), a large gear (303) and a side bevel gear (306) fixedly mounted on the eccentric wheel (304), the large gear (303) meshing with the motor gear (302), a rotating rod (305) eccentrically rotatably mounted on the eccentric wheel (304), the rotating rod (305) rotatably mounted on the base (101), a gear shaft (307) rotatably mounted on the slide (102), a spur bevel gear (308) and an upper gear (309) fixedly mounted on the gear shaft (307), the spur bevel gear (308) meshing with the side bevel gear (306).

7. A rotational injection molding device for plastic production according to claim 6, characterized in that: A mold frame (310) is rotatably mounted on the slide (102), a mold frame gear (311) is fixedly mounted on the mold frame (310), the mold frame gear (311) is meshed with the upper gear (309), two mold frames (312) are fixedly mounted on the mold frame (310), a lower mold (313) is slidably mounted in the mold frame (312), the interior of the lower mold (313) is a hollow structure, and two water inlet pipes (316) are provided on the lower mold (313), the water inlet pipes (316) are connected to the external water pipe, and the water inlet pipes (316) are communicated with the inner space of the lower mold (313).

8. A rotational injection molding device for plastic production according to claim 7, characterized in that: A docking electric cylinder (315) is fixedly mounted on the mold frame (310), a docking frame (314) is fixedly mounted on the output end of the docking electric cylinder (315), the lower mold (313) is fixedly mounted on the docking frame (314), a stripper plate (317) is slidably mounted on the lower mold (313), a return spring (318) is provided between the stripper plate (317) and the lower mold (313), a plurality of ejector rods (319) are fixedly mounted on the stripper plate (317), and the ejector rods (319) are slidably mounted on the lower mold (313).

Images