Injection mold for plastic part

Abstract

The invention relates to the technical field of injection molds, in particular to an injection mold for plastic parts, a top end mold and a bottom end mold are arranged in a mold body, an injection molding cavity is formed in the top end of the bottom end mold, a sliding cavity communicated with the injection molding cavity is formed in the bottom end mold, and a demolding cylinder is installed in the sliding cavity in an up-down sliding mode; a plurality of swing holes are uniformly formed in the outer end of the demolding cylinder, a demolding rod is rotatably mounted at the lower end of each swing hole, a sliding shell is mounted in each swing hole in an up-down sliding manner, a supporting rod is connected between each sliding shell and the corresponding demolding rod, an extrusion spring is fixedly mounted on each sliding shell, and an extrusion device is arranged on the lower side of the demolding cylinder. By spraying the release agent, the defects such as scratches and strain on the surface of the plastic box can be effectively avoided, it is ensured that the surface smoothness meets the requirement, meanwhile, the time needed for demolding each time is shortened, the yield is remarkably increased, direct friction and adhesion with the surface of a mold are avoided, and the abrasion degree of the mold is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molds, in particular to an injection mold for plastic parts. Background Art

[0002] An injection mold, also known as an injection mold, is a tool used for injection molding. It's typically made of metal and includes a male and female mold. During the injection molding process, plastic pellets are heated to a molten state, then pressure is applied and injected into the mold. The mold cools to form the plastic product. Currently, injection molds are commonly used to make plastic boxes, which offer enhanced user experience, durable packaging, moisture resistance, waterproofing, high toughness, and safe transportation.

[0003] After the existing injection mold is completed for casting the plastic box, in order to prevent the plastic box from sticking to the mold, a release agent is usually applied to the inside of the mold to prevent the plastic box from sticking to the mold. In general, the mold is manually applied with the release agent. Due to the high temperature of the mold itself, it is easy to get burned when applying the release agent, which poses a certain safety hazard. In addition, after removing the plastic box, some plastic impurities will be stuck on the inner surface of the mold. If the impurities are not cleaned in time, it will affect the subsequent molding of the plastic box. In general, it is manually cleaned, which greatly reduces work efficiency.

[0004] Therefore, the present invention provides an injection mold for plastic parts to solve the above problems. Summary of the Invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides an injection mold for plastic parts, which effectively solves the problem of being easily burned when manually applying release agent to the mold and reducing work efficiency when manually cleaning impurities.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: An injection mold for plastic parts includes a mold body, wherein a top mold and a bottom mold are provided inside the mold body, an injection cavity is provided at the top of the bottom mold, and a sliding cavity that passes through the injection cavity is provided inside the bottom mold, a demolding cylinder is installed inside the sliding cavity for sliding up and down, a plurality of swing holes are evenly provided on the outer end of the demolding cylinder, a demolding rod is rotatably installed at the lower end of each swing hole, a sliding shell is installed inside each swing hole for sliding up and down, a support rod is connected between each sliding shell and the corresponding demolding rod, an extrusion spring is fixedly installed on each sliding shell, and an extrusion device is provided on the lower side of the demolding cylinder.

[0007] Preferably, side shells are fixedly installed on both sides of the top of the mold body, a fixed horizontal plate is fixedly installed between the tops of the two side shells, a hydraulic telescopic rod is installed on the fixed horizontal plate, a lifting plate is installed between the two side shells for sliding up and down, the telescopic end of the hydraulic telescopic rod is fixedly connected to the lifting plate, the top mold is detachably installed on the bottom end of the lifting plate, a fixed pad is fixedly installed on the top of the mold body, and the bottom mold is installed on the top of the fixed pad.

[0008] Preferably, the extrusion device includes a supporting cylinder, a coaxial rod is coaxially fixedly installed on the lower end of the demoulding cylinder, a positioning ring shell is coaxially fixedly installed on the coaxial rod, a stabilizing ring is rotatably installed on the outer end of the positioning ring shell, a storage ring is fixedly installed on the lower end of the demoulding cylinder, each of the demoulding rods is connected to the storage ring, and the storage ring and the positioning ring shell are connected by a fixed tube, a demoulding agent assembly is provided on the left side of the bottom mold, and a supporting cylinder is provided on one side of the bottom mold.

[0009] Preferably, a plurality of movement cavities are evenly opened at the outer end of the demoulding cylinder, a driving shell is installed inside each movement cavity for sliding up and down, an injection rod is rotatably installed at the lower end of each movement cavity, a push rod is connected between each driving shell and the injection rod, a driving spring is fixedly installed at one end of each driving shell, and an injection assembly is provided below the bottom mold.

[0010] Preferably, a load plate is detachably mounted on the top of the fixed pad, a guide shaft is fixedly mounted on the top of the load plate, a buffer spring is sleeved on the guide shaft, a driving telescopic rod is provided on the top of the load plate, and the other end of the driving telescopic rod is connected to the bottom mold.

[0011] Preferably; the release agent assembly includes a spray tube, the stabilizing ring is fixedly connected to the spray tube, an extension body is fixedly installed on the left side of the bottom mold, a supporting cylinder is fixedly installed on the extension body, the spray tube is fixedly connected to the supporting cylinder, a first piston rod is installed inside the supporting cylinder for sliding up and down, a first scale shell is fixedly installed on the top end of the first piston rod, a quantitative column is threadedly connected to the top end of the first scale shell, a follower plate is fixedly installed on the first piston rod, and a descending rod is provided on the left side of the top mold.

[0012] Preferably, the jet assembly includes an air storage ring, a jet ring is fixedly mounted on the coaxial rod, the air storage ring and the jet ring are connected by a conduit, a self-rotating disk is rotatably mounted on the lower end of the jet ring, a chassis is fixedly mounted on the bottom end of the bottom mold, an air outlet pipe passing through the chassis is fixedly mounted on the self-rotating disk, an extrusion cylinder is fixedly mounted on the bottom end of the bottom mold, the air outlet pipe and the extrusion cylinder are fixedly connected, a second piston rod is slidably mounted inside the extrusion cylinder, a second scale shell is fixedly mounted on the bottom end of the second piston rod, and a quantitative rod is threadedly connected to the second scale shell.

[0013] Preferably; the lower end of the chassis is rotatably mounted with a sleeve mounted on the demoulding rod, the bottom end of the coaxial rod is mounted with a reset spring, a bevel gear set is mounted on the sleeve, and a partition is fixedly mounted on the bottom end of the bottom mold, and a one-way gear and a drive rack are mounted on the partition.

[0014] Preferably, the four corners of the top end of the bottom mold are respectively fixedly mounted with insertion rods, and each of the insertion rods is sleeved with a pressure spring.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. Spraying the release agent can effectively avoid scratches, scratches and other defects on the surface of the plastic box, ensure that the surface smoothness meets the requirements, and also reduce the time required for each demoulding, significantly improve the output, avoid direct friction and adhesion with the mold surface, and reduce the wear of the mold.

[0016] 2. Through the coordinated use of the jet rod, ejector rod, drive housing, and drive spring, impurities attached to the inner wall of the injection cavity are cleaned, and the blown gas can clean the impurities outside the plastic box, ensuring a smooth product surface, reducing defects, and improving the overall quality of the product.

[0017] 3. By adjusting the length of the quantitative column, you can control the length of the piston sliding down along the bearing cylinder, thereby achieving quantitative control of the amount of release agent sprayed.

[0018] 4. By adjusting the length of the metering rod, you can control the length of the piston sliding down along the extrusion cylinder, thereby achieving quantitative control of the amount of gas ejected.

[0019] 5. The mold can not only spray the release agent in a quantitative manner, but also spray the gas in a quantitative manner, which improves automation, reduces the physical strength of the personnel, and will not cause personal injury. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional schematic diagram of the present invention; Figure 2 Schematic diagram of the top mold and bottom mold structure of the present invention; Figure 3 It is a schematic structural diagram of the demoulding cylinder of the present invention; Figure 4 This is a schematic diagram of the installation position of the carrier tube of the present invention; Figure 5 Schematic diagram of the cross section of the bottom mold of the present invention; Figure 6 This is a schematic diagram of the installation position of the one-way gear of the present invention; Figure 7 It is a schematic cross-sectional view of the extrusion cylinder of the present invention; Figure 8 Schematic cross-sectional view of the demoulding cylinder of the present invention; Figure 9 It is a cross-sectional schematic diagram of the carrier tube of the present invention; Figure 10 This is a schematic diagram of the installation position of the sliding cavity of the present invention; Figure 11 For the present invention Figure 5 A is an enlarged schematic diagram.

[0021] Markings in the figure: 1. mold body; 2. top mold; 3. bottom mold; 4. injection cavity; 5. sliding cavity; 6. demoulding cylinder; 7. swing hole; 8. demoulding rod; 9. sliding shell; 10. support rod; 11. extrusion spring; 12. side shell; 13. fixed cross plate; 14. hydraulic telescopic rod; 15. lifting plate; 16. fixed pad; 17. bearing cylinder; 18. coaxial rod; 19. positioning ring shell; 20. stabilizing ring; 21. storage ring; 22. motion cavity; 23. drive shell; 24. jet rod; 25. ejector pin; 26. drive spring; 27. load plate; 28. guide shaft; 29. Buffer spring; 30. Driving telescopic rod; 31. Spray tube; 32. Extension body; 34. First piston rod; 35. First scale housing; 36. Dosing column; 37. Driven plate; 38. Air storage ring; 39. Jet ring; 40. Conduit; 41. Rotating disk; 42. Chassis; 43. Exhaust pipe; 44. Extrusion cylinder; 45. Second piston rod; 46. Second scale housing; 47. Dosing rod; 48. Sleeve; 49. Return spring; 50. Bevel gear set; 51. Partition; 52. One-way gear; 53. Driving rack; 54. Insert rod; 55. Pressure spring; 56. Lowering rod. DETAILED DESCRIPTION

[0022] Refer to the following Figures 1 to 11 The embodiments of the present invention are described in detail. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0023] An injection mold for plastic parts, such as Figure 1 、 Figure 2 、 Figure 5 、 Figure 7 、 Figure 8 、 Figure 11 As shown, it includes a mold body 1, and a top mold 2 and a bottom mold 3 are provided inside the mold body 1. The top mold 2 is a convex mold, and the bottom mold 3 is a concave mold. An injection cavity 4 is provided at the top of the bottom mold 3, and the injection cavity 4 is used for molding the plastic box. A molding convex block is fixedly installed on the bottom end of the top mold 2. A sliding cavity 5 that passes through the injection cavity 4 is provided inside the bottom mold 3. The bottom end of the sliding cavity 5 does not pass through the bottom end of the bottom mold 3. A demoulding cylinder 6 is installed inside the sliding cavity 5 for sliding up and down. A closing plate is fixedly installed on the top end of the demoulding cylinder 6. The closing plate can close the top end of the sliding cavity 5. The outer diameter of the closing plate is larger than the outer diameter of the demoulding cylinder 6. The outer end of the demoulding cylinder 6 is evenly provided with three swing Hole 7, a demoulding rod 8 is rotatably installed inside the lower end of each swing hole 7, and the demoulding rod 8 can swing freely along the inside of the swing hole 7, or can be hidden inside the swing hole 7. A built-in hole is opened in the middle of the demoulding rod 8, and a built-in shaft is fixedly installed inside the built-in hole. A sliding shell 9 is installed inside the swing hole 7 for sliding up and down. A support rod 10 is rotatably connected to each sliding shell 9, and the other end is rotatably connected to the built-in shaft. An extrusion spring 11 is fixedly installed on the upper end of each sliding shell 9, and the other end of the extrusion spring 11 is fixedly connected to the inner wall of the bottom end of the swing hole 7. An extrusion device is provided on the lower side of the demoulding cylinder 6 (it should be noted that the components in this application are made of high-temperature resistant material); The personnel push the closing plate and the demoulding cylinder 6 toward the inside of the sliding cavity 5. The three demoulding rods 8 slide along the top edge of the sliding cavity 5. The demoulding rods 8 push the corresponding support rods 10 and the sliding shell 9 to compress the extrusion spring 11, so that the three support rods 10 are hidden inside the corresponding swing holes 7. Finally, the closing plate completely closes the top of the sliding cavity 5. When injection molding a plastic box, the mold body 1 is placed in a suitable area, the top mold 2 and the bottom mold 3 are brought close to each other, so that the molding protrusion is inserted into the injection cavity 4, and then the plastic melt is injected into the injection cavity 4. After waiting for the cooling time to end, the top mold 2 and the bottom mold 3 are moved away from each other to a suitable distance, and the demoulding cylinder 6 is driven to slide upward along the sliding cavity 5 and lift the plastic box. After the plastic box is lifted up, it is convenient for people to take it out; When the demoulding cylinder 6 slides upward along the sliding cavity 5, due to the rebound force of the extrusion spring 11, the three sliding shells 9 push the corresponding demoulding rods 8 through the support rods 10 from the initial parallel state to gradually become parallel. Figure 4In the tilted state, when the personnel takes out the plastic box, they push the closing plate and the demoulding cylinder 6 to move toward the inside of the sliding cavity 5. The demoulding agent inside the three demoulding rods 8 will be sprayed into the inside of the injection cavity 4, making it convenient to take out the plastic box. At the same time, the demoulding rods 8 slide along the top edge of the sliding cavity 5. The demoulding rods 8 push the corresponding support rods 10 and the sliding shell 9 to compress the extrusion spring 11, so that the three support rods 10 are hidden in the corresponding swing holes 7. The closing plate completely seals the top of the sliding cavity 5, and subsequent injection molding is carried out. By spraying the release agent, scratches, tearing and other defects on the surface of the plastic box can be effectively avoided, ensuring that the surface smoothness meets the requirements. At the same time, it also reduces the time required for each demoulding, significantly improves production, avoids direct friction and adhesion with the mold surface, and reduces the degree of mold wear.

[0024] like Figure 1 As shown, side shells 12 are fixedly installed on both sides of the top of the mold body 1, and a fixed horizontal plate 13 is fixedly installed between the tops of the two side shells 12. A hydraulic telescopic rod 14 is fixedly provided on the fixed horizontal plate 13. The hydraulic telescopic rod 14 is connected to the controller, and the controller is connected to the power supply. A lifting plate 15 is installed between the two side shells 12 for sliding up and down. The telescopic end of the hydraulic telescopic rod 14 is fixedly connected to the lifting plate 15. The top mold 2 is installed on the bottom end of the lifting plate 15 by bolts. A fixed pad 16 located between the two side shells 12 is fixedly installed on the top of the mold body 1, and the bottom mold 3 is installed on the top of the fixed pad 16. Turn on the power, the controller starts the hydraulic telescopic rod 14, the hydraulic telescopic rod 14 pushes the lifting plate 15 and the top mold 2 to move downward, and the bottom mold 3 moves upward synchronously, and then the subsequent injection molding work.

[0025] like Figure 2 、 Figure 3 、 Figure 7As shown, the extrusion device includes a carrying cylinder 17, and the bottom end of the bottom mold 3 is provided with a coaxial hole that penetrates the sliding cavity 5. The diameter of the coaxial hole is smaller than the diameter of the sliding cavity 5. The lower end of the demoulding cylinder 6 is coaxially fixed with a coaxial rod 18, and the coaxial rod 18 is slidably installed in the inside of the coaxial hole. A positioning ring shell 19 is coaxially fixed on the coaxial rod 18, and a stabilizing ring 20 is rotatably connected to the outer end of the positioning ring shell 19. The interior of the positioning ring shell 19 is a cavity structure, and a sealing strip in contact with the stabilizing ring 20 is fixedly installed on the positioning ring shell 19. The sealing strip can improve the sealing between the positioning ring shell 19 and the stabilizing ring 20. The sealing between the fixed ring 20, the lower end of the demoulding cylinder 6 is coaxially fixedly installed with a storage ring 21, the storage ring 21 is arranged above the positioning ring shell 19, the interior of the demoulding rod 8 is a cavity structure, and the top of the demoulding rod 8 is fixedly connected with a nozzle, each of the demoulding rods 8 is fixedly connected to the storage ring 21 through an infusion tube, and the storage ring 21 is fixedly connected to the positioning ring shell 19 through a fixed tube, the storage ring 21, the stabilizing ring 20, and the positioning ring shell 19 are arranged inside the sliding cavity 5, a demoulding agent assembly is provided on the left side of the bottom mold 3, and a supporting cylinder 17 is provided on one side of the bottom mold 3.

[0026] like Figure 7 、 Figure 8 As shown, three movement cavities 22 are evenly opened at the outer end of the demoulding cylinder 6, and a movement cavity 22 is provided between every two swing holes 7. A driving shell 23 is installed in the interior of each movement cavity 22 for sliding up and down. An air jet rod 24 is rotatably installed in the lower end of each movement cavity 22, and a positioning ring is fixedly installed in the middle of each air jet rod 24. A push rod 25 is rotatably connected to each drive shell 23, and the other end of the push rod 25 is rotatably connected to the drive shell 23. A driving spring 26 is fixedly installed at the other end of each drive shell 23, and the other end of the driving spring 26 is fixedly connected to the inner wall of the inner end of the movement cavity 22. An air jet assembly is provided below the bottom mold 3. A person pushes the closing plate and the demoulding cylinder 6 toward the interior of the sliding cavity 5. The three air-jet rods 24 slide along the top edge of the sliding cavity 5. The air-jet rods 24 push the corresponding ejector rods 25 and the drive housing 23 to compress the drive spring 26. The three air-jet rods 24 are hidden in the interior of the corresponding movement cavity 22. Finally, the closing plate completely seals the top of the sliding cavity 5. When the cooling time of the plastic box is over, the top mold 2 and the bottom mold 3 are moved away from each other to a suitable distance, driving the demoulding cylinder 6 to slide upward along the sliding cavity 5 and lift the plastic box. Due to the rebound force of the driving spring 26, the three driving shells 23 push the corresponding air injection rods 24 from the initial parallel state through the ejector rod 25 and gradually become Figure 4 The tilted state in When the demoulding cylinder 6 slides upward along the sliding cavity 5 and lifts the plastic box, each air injection rod 24 blows air into the injection cavity 4 to clean the impurities adhering to the inner wall of the injection cavity 4. The blown air can also clean the impurities outside the plastic box, ensuring a smooth product surface, reducing defects, and improving the overall quality of the product. After the personnel takes out the plastic box, they push the closing plate and the demoulding cylinder 6 toward the inside of the sliding cavity 5. The three jet rods 24 slide along the top edge of the sliding cavity 5. The jet rods 24 push the corresponding ejector rods 25 and the drive shell 23 to compress the drive spring 26. The three jet rods 24 are hidden in the corresponding motion cavity 22. Finally, the closing plate completely closes the top of the sliding cavity 5 for subsequent injection molding.

[0027] like Figure 1 、 Figure 2 、 Figure 4 As shown, the top bolt of the fixed pad 16 is installed with a load plate 27, and the four corners of the top of the load plate 27 are respectively fixedly installed with guide shafts 28, and the guide shafts 28 are sleeved with buffer springs 29. The bottom end of the bottom mold 3 is slidably installed between the top ends of the four guide shafts 28, and the top end of the guide shaft 28 slides up and down through the bottom mold 3. One end of the buffer spring 29 is fixedly connected to the bottom end of the guide shaft 28, and the other end is fixedly connected to the bottom end of the bottom mold 3. A driving telescopic rod 30 is fixedly installed on the top of the load plate 27, and the telescopic end of the driving telescopic rod 30 is fixedly installed on the bottom end of the bottom mold 3. The driving telescopic rod 30 is a hydraulic telescopic rod and is connected to the controller and the power supply. A protective cover is installed between the load plate 27 and the bottom mold 3, and the protective cover has compression and tension characteristics. When the power is turned on, the controller starts to drive the telescopic rod 30 to push the bottom mold 3 to slide upward. The bottom mold 3 slides upward along the four guide shafts 28, and the buffer spring 29 is gradually stretched, thereby performing subsequent injection molding work.

[0028] like Figure 3 、 Figure 4 、 Figure 5 、 Figure 9As shown, the release agent assembly includes a spray tube 31, the stabilizing ring 20 is fixedly connected to the spray tube 31, and the spray tube 31 is slidably arranged inside the bottom mold 3, the stabilizing ring 20 can slide freely with the spray tube 31, the spray tube 31 is long enough, and the left end of the bottom mold 3 is fixedly installed with an extension body 32, and a supporting cylinder 17 is fixedly installed on the extension body 32. The bottom end of the supporting cylinder 17 is in a closed state and the top end is in an open state. The other end of the spray tube 31 is fixedly connected to the bottom end of the supporting cylinder 17, and a first one-way valve is fixedly installed inside the outer end of the spray tube 31. The bottom end of the supporting cylinder 17 is fixedly connected to an inlet pipe located on one side of the spray tube 31, and the other end of the inlet pipe is inserted into the outside of the release agent barrel. A second one-way valve is fixedly installed inside the inlet pipe, and the interior of the supporting cylinder 17 is slidably installed up and down. There is a first piston rod 34, the bottom end of the first piston rod 34 is coaxially fixed with a first piston, the first piston is slidably connected to the inner wall of the carrying cylinder 17, the top end of the first piston rod 34 is fixedly mounted with a first scale housing 35, the first scale housing 35 is provided with a scale, the top end of the first scale housing 35 is threadedly connected with a quantitative column 36, the rotation of the quantitative column 36 can move up and down along the first scale housing 35, the first piston rod 34 is fixedly mounted with a driven plate 37, the driven plate 37 is provided at an upper position of the carrying cylinder 17, the driven plate 37 is slidably connected to the outer wall of the bottom mold 3, a compression spring is fixedly mounted on the driven plate 37, the other end of the compression spring is fixedly connected to the extension body 32, the left end of the top mold 2 is fixedly provided with a descending rod 56, and the descending rod 56 is provided correspondingly to the quantitative column 36 up and down; When the plastic box is injection molded, the mold body 1 is placed in a suitable area, the top mold 2 and the bottom mold 3 are close to each other, the descending rod 56 presses the quantitative column 36 and the first piston rod 34 to slide downward, and the driven plate 37 slides downward. The compression spring is continuously compressed, and the first piston squeezes the release agent in the carrier cylinder 17. The second one-way valve is in a closed state and the first one-way valve is opened. Since the first piston continuously squeezes the release agent in the carrier cylinder 17, the release agent enters the interior of the stabilizing ring 20 through the spray pipe 31, and then the release agent passes through the positioning ring shell 19, the fixing tube, and the storage ring 21 and enters the interior of the three demoulding rods 8 respectively, and is finally sprayed into the interior of the injection cavity 4, thereby realizing the function of automatic spraying of the release agent, reducing the physical strength of the personnel and not causing burns. In addition, by spraying the release agent, it is possible to effectively avoid scratches, strains and other defects on the surface of the plastic box, ensuring that the surface smoothness meets high precision requirements; When the top mold 2 and the bottom mold 3 move away from each other, the descending rod 56 is no longer in contact with the quantitative column 36. Due to the rebound force of the compression spring, the driven plate 37 slides upward with the first piston rod 34 and the first scale housing 35. At this time, the second one-way valve is in the open state, and the first one-way valve is in the closed state. Due to the negative pressure, the release agent on the outside is transported to the inside of the carrier cylinder 17 through the inlet pipe, thereby automatically adding the release agent to the inside of the carrier cylinder 17, preparing for subsequent work and reducing the physical strength of the personnel. When the amount of mold release agent sprayed needs to be quantitatively controlled, the quantitative column 36 is rotated to slide up and down along the first scale shell 35, the scale line is observed, and the length of the quantitative column 36 is adjusted to control the length of the piston sliding downward along the supporting cylinder 17, thereby achieving quantitative control of the amount of mold release agent sprayed.

[0029] like Figure 3 、 Figure 5 、 Figure 7 、 Figure 8 、 Figure 10 、 Figure 11 As shown, the jet assembly includes an air storage ring 38, and an air jet pipe is connected between each air jet rod 24 and the air storage ring 38. A cavity is provided inside the air jet rod 24, and an air jet ring 39 is fixedly mounted on the coaxial rod 18. The air jet ring 39 is arranged on the lower side of the positioning ring shell 19. The air storage ring 38 is fixedly connected with a conduit 40, one end of the conduit 40 passes through the positioning ring shell 19 and is fixedly connected to the air jet ring 39, and a cavity is opened at the lower end of the air jet ring 39, and a rotating disk 41 located inside the cavity is rotatably connected to the air jet ring 39, and a sealing strip in contact with the inner wall of the cavity is fixedly connected to the outer side of the rotating disk 41, thereby improving the sealing between the rotating disk 41 and the air jet ring 39, and the bottom end of the bottom mold 3 is fixedly mounted with a chassis 42, and an air outlet pipe 43 that passes through the chassis 42 and the bottom mold 3 is fixedly connected on the rotating disk 41, and the air outlet pipe 43 can slide freely along the chassis 42 and the bottom mold 3, and the air outlet pipe 43 is long enough. 3 is fixedly installed with an extrusion cylinder 44 at the bottom end, the top of the extrusion cylinder 44 is in a closed state, and the bottom end is in an open state. The other end of the air outlet pipe 43 is fixedly connected to the top of the extrusion cylinder 44, and one end of the air outlet pipe 43 is fixedly installed with a third one-way valve. A second piston rod 45 is installed inside the extrusion cylinder 44 for sliding up and down. A piston is fixedly installed on the second piston rod 45. A piston is sleeved on the second piston rod 45. One end of the piston spring is fixedly connected to the piston, and the other end is fixedly connected to the bottom end of the extrusion cylinder 44. The piston spring is arranged inside the extrusion cylinder 44, and the piston is slidably connected to the inside of the extrusion cylinder 44. A second scale housing 46 is fixedly installed on the bottom end of the second piston rod 45, and a scale is provided on the second scale housing 46. A quantitative rod 47 is threadedly connected to the second scale housing 46. The quantitative rod 47 can slide up and down along the second scale housing 46 during rotation, and a fourth one-way valve is fixedly installed on the extrusion cylinder 44. When the amount of mold release agent sprayed needs to be quantitatively controlled, the quantitative rod 47 is rotated to slide up and down along the second scale shell 46, the scale line is observed, and the length of the quantitative rod 47 is adjusted to control the length of the piston sliding downward along the extrusion cylinder 44, thereby achieving quantitative control of the gas ejection amount.

[0030] like Figure 3 、 Figure 4 、 Figure 6 、 Figure 7 、 Figure 10 As shown, the lower end of the chassis 42 is rotatably mounted with a sleeve 48 sleeved on the outside of the coaxial rod 18, and a positioning key is fixedly mounted on the inner end of the sleeve 48. The outer end of the coaxial rod 18 is fixedly provided with a keyway, and the positioning key is slidably mounted inside the keyway. A return spring 49 is sleeved on the bottom end of the coaxial rod 18, and one end of the return spring 49 is fixedly mounted on the bottom end of the sleeve 48, and the other end is rotatably mounted on the bottom end of the coaxial rod 18. A bevel gear set 50 is mounted on the sleeve 48, and the bevel gear set 50 includes a first bevel gear, a second bevel gear, and an L-shaped plate. The first bevel gear and the second bevel gear are rotatably mounted on the L-shaped plate. The first bevel gear and the second bevel gear are meshed and connected, and the first bevel gear is coaxially fixedly mounted on the sleeve 48. A partition 51 is fixedly mounted on the bottom end of the bottom mold 3, and the partition 51 is fixedly mounted on the bottom end of the bottom mold 3. 1 is rotatably mounted on a linkage shaft coaxially fixedly mounted with the second bevel gear, and a one-way gear 52 is rotatably mounted on the partition plate 51. The one-way gear 52 is coaxially fixedly connected to the linkage shaft (the one-way gear 52 is a prior art and will not be described in detail here. In actual use, a suitable existing one-way gear 52 is selected). A driving rack 53 meshing with the one-way gear 52 is fixedly mounted on the load plate 27. The top four corners of the bottom mold 3 are respectively fixedly mounted with an insertion rod 54, each of which is provided with a pressure spring 55. One end of the pressure spring 55 is fixedly connected to the top of the bottom mold 3, and a positioning hole is respectively opened at the top four corners of the bottom mold 3; each insertion rod 54 is arranged corresponding to the positioning hole below. Due to the rebound force of the reset spring 49, the demoulding rod 8 is always in contact with the load plate 27; Under normal conditions, the demoulding cylinder 6 extends into the interior of the injection cavity 4, and the demoulding rod 8 and the air injection rod 24 are in an inclined state; Turn on the power, the controller activates the hydraulic telescopic rod 14 to push the lifting plate 15 and the top mold 2 downward, and drives the telescopic rod 30 to push the bottom mold 3 to slide upward. The bottom mold 3 slides upward along the four guide shafts 28, and the buffer spring 29 is gradually stretched, driving the rack 53 to engage the one-way gear 52 to rotate. At this time, the linkage shaft, the second bevel gear, and the first bevel gear rotate, and then the sleeve 48 drives the coaxial rod 18, the return spring 49, the air injection ring 39, the positioning ring shell 19, the air storage ring 38, the agent storage ring 21, and the demoulding cylinder 6 to rotate synchronously; Then the descending rod 56 presses the quantitative column 36 and the first piston rod 34 to slide downward, the driven plate 37 presses the compression spring to continue to compress, the second one-way valve is in the closed state, the first one-way valve is opened, and the first piston squeezes the release agent in the bearing cylinder 17 into the interior of the stabilizing ring 20 through the spray pipe 31, and the release agent passes through the positioning ring shell 19, the fixed tube, and the storage ring 21 and respectively enters the interior of the three demoulding rods 8, and finally is evenly sprayed into the interior of the injection cavity 4 until the closing plate completely closes the top of the sliding cavity 5, and the release agent stops spraying. At the same time, the insertion rod 54 is just inserted into the corresponding positioning hole, and the molding protrusion is also inserted into the interior of the injection cavity 4, realizing the function of automatic rotary injection demoulding, reducing the physical strength of the personnel, and improving the surface smoothness of the plastic box; Then, the plastic melt is injected into the injection cavity 4. After the cooling time is over, the controller starts the hydraulic telescopic rod 14, which moves the lifting plate 15 and the top mold 2 upward, driving the telescopic rod 30 to slide the bottom mold 3 downward. The bottom mold 3 slides downward along the four guide shafts 28, and the buffer spring 29 gradually resets, driving the rack 53 to slide downward, and the one-way gear 52 remains stationary. The rebound force of the compression spring drives the driven plate 37 to push the first scale housing 35 and the first piston rod 34 to slide upward. At this time, the second one-way valve is in the open state, and the first one-way valve is in the closed state. The release agent on the outside is transported to the inside of the carrier cylinder 17 through the inlet pipe. At the same time, the return spring 49 is gradually compressed, and the coaxial rod 18 moves gradually toward the upper end of the sliding cavity 5 with the closing plate and the demoulding cylinder 6, the demoulding rod 8 and the air injection rod 24 gradually slide outward, and the closing plate slides upward against the plastic box, and the air injection rod 24 and the demoulding rod 8 gradually tilt outward. At the same time, the quantitative rod 47 slides upward against the load plate 27, the second scale shell 46, the second piston rod 45, and the piston slide upward against the extrusion cylinder 44, the third one-way valve opens, the fourth one-way valve is closed, the piston spring is compressed, and the gas inside the extrusion cylinder 44 enters the inside of the air injection ring 39 through the air outlet pipe 43. The gas is sprayed into the inside of the injection cavity 4 through the conduit 40, the air storage ring 38, and the gas in the air injection rod 24, blowing away the impurities outside the plastic box and the impurities inside the injection cavity 4, ensuring a smooth product surface, reducing defects, improving the overall quality of the product, and also realizing the function of automatically cleaning impurities.

[0031] It should be noted that in the description of the present invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. These are merely for ease of description and are not intended to indicate or imply that the device or component described must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed installation, detachable connection, or integral connection; they may refer to mechanical connection or electrical connection; they may refer to direct connection or indirect connection through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0033] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. An injection mold for a plastic part, comprising a mold body (1), characterized in that: The mold body (1) is provided with a top mold (2) and a bottom mold (3), the top of the bottom mold (3) is provided with an injection cavity (4), the bottom mold (3) is provided with a sliding cavity (5) which is connected with the injection cavity (4), the sliding cavity (5) is provided with a demoulding cylinder (6) which is slidably mounted up and down, the outer end of the demoulding cylinder (6) is evenly provided with a plurality of swing holes (7), the lower end of each swing hole (7) is rotatably provided with a demoulding rod (8), the inside of each swing hole (7) is provided with a sliding shell (9) which is slidably mounted up and down, each sliding shell (9) is connected to the corresponding demoulding rod (8) with a support rod (10), each sliding shell (9) is fixedly provided with an extrusion spring (11), and the lower side of the demoulding cylinder (6) is provided with an extrusion device.

2. The injection mold for plastic parts according to claim 1, characterized in that: Side shells (12) are fixedly installed on both sides of the top of the mold body (1), a fixed transverse plate (13) is fixedly installed between the tops of the two side shells (12), a hydraulic telescopic rod (14) is installed on the fixed transverse plate (13), a lifting plate (15) is installed between the two side shells (12) so as to slide up and down, the telescopic end of the hydraulic telescopic rod (14) is fixedly connected to the lifting plate (15), the top mold (2) is detachably installed on the bottom end of the lifting plate (15), a fixed pad (16) is fixedly installed on the top of the mold body (1), and the bottom mold (3) is installed on the top end of the fixed pad (16).

3. The injection mold for plastic parts according to claim 2, characterized in that: The extrusion device includes a supporting cylinder (17), a coaxial rod (18) is coaxially fixedly installed on the lower end of the demoulding cylinder (6), a positioning ring shell (19) is coaxially fixedly installed on the coaxial rod (18), a stabilizing ring (20) is rotatably installed on the outer end of the positioning ring shell (19), a storage ring (21) is fixedly installed on the lower end of the demoulding cylinder (6), each demoulding rod (8) is connected to the storage ring (21), and the storage ring (21) and the positioning ring shell (19) are connected through a fixed tube, a demoulding agent assembly is provided on the left side of the bottom mold (3), and a supporting cylinder (17) is provided on one side of the bottom mold (3).

4. The injection mold for plastic parts according to claim 3, characterized in that: The outer end of the demoulding cylinder (6) is evenly provided with a plurality of movement cavities (22), a driving shell (23) is slidably installed inside each movement cavity (22), an air jet rod (24) is rotatably installed at the lower end of each movement cavity (22), a push rod (25) is connected between each driving shell (23) and the air jet rod (24), a driving spring (26) is fixedly installed at one end of each driving shell (23), and an air jet assembly is provided below the bottom mold (3).

5. The injection mold for plastic parts according to claim 2, characterized in that: A load plate (27) is detachably mounted on the top of the fixed pad (16), a guide shaft (28) is fixedly mounted on the top of the load plate (27), a buffer spring (29) is sleeved on the guide shaft (28), a driving telescopic rod (30) is provided on the top of the load plate (27), and the other end of the driving telescopic rod (30) is connected to the bottom mold (3).

6. The injection mold for plastic parts according to claim 3, characterized in that: The release agent assembly includes a spray pipe (31), the stabilizing ring (20) is fixedly connected to the spray pipe (31), an extension body (32) is fixedly installed on the left side of the bottom mold (3), a supporting cylinder (17) is fixedly installed on the extension body (32), the spray pipe (31) is fixedly connected to the supporting cylinder (17), a first piston rod (34) is slidably installed inside the supporting cylinder (17), a first scale shell (35) is fixedly installed on the top end of the first piston rod (34), a quantitative column (36) is threadedly connected to the top end of the first scale shell (35), a driven plate (37) is fixedly installed on the first piston rod (34), and a descending rod (56) is provided on the left side of the top mold (2).

7. The injection mold for plastic parts according to claim 4, characterized in that: The jet assembly includes an air storage ring (38), an air jet ring (39) is fixedly mounted on the coaxial rod (18), the air storage ring (38) and the air jet ring (39) are connected via a conduit (40), a self-rotating disc (41) is rotatably mounted on the lower end of the air jet ring (39), a chassis (42) is fixedly mounted on the bottom end of the bottom end mold (3), an air outlet pipe (43) penetrating the chassis (42) is fixedly mounted on the self-rotating disc (41), an extrusion cylinder (44) is fixedly mounted on the bottom end of the bottom end mold (3), the air outlet pipe (43) and the extrusion cylinder (44) are fixedly connected, a second piston rod (45) is slidably mounted inside the extrusion cylinder (44), a second scale housing (46) is fixedly mounted on the bottom end of the second piston rod (45), and a quantitative rod (47) is threadedly connected to the second scale housing (46).

8. The injection mold for plastic parts according to claim 7, characterized in that: A sleeve (48) sleeved on the demoulding rod (8) is rotatably mounted on the lower end of the chassis (42), a return spring (49) is sleeved on the bottom end of the coaxial rod (18), a bevel gear set (50) is mounted on the sleeve (48), and a partition (51) is fixedly mounted on the bottom end of the bottom mold (3), and a one-way gear (52) and a drive rack (53) are mounted on the partition (51).

9. The injection mold for plastic parts according to claim 1, characterized in that: Insertion rods (54) are fixedly mounted on the four corners of the top end of the bottom mold (3), and each of the insertion rods (54) is sleeved with a pressure spring (55).

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