Injection molding method of plastic household product

Abstract

The invention discloses an injection molding method for plastic household products, relates to the field of plastic household product production, and provides an injection molding device which comprises a machine table, a feeding unit, a movable mold and a static mold, a boss is arranged on the end face of the movable mold, and a cavity is formed among the movable mold, the static mold and the boss. A discharging unit is arranged below the movable mold and the static mold, and a conveying unit is arranged on the lower portion in the machine table. Molten plastic fluid is input into the cavity through a feeding unit, pressure maintaining and cooling are conducted, and a finished storage box product is obtained; and the movable mold and the static mold are separated, so that the finished storage box is withdrawn from the interior of the cavity. According to the injection molding method of the plastic household product, through cooperative use of the discharging unit, the storage box can be rapidly ejected out and guided and conveyed after being formed, so that the storage box can efficiently and stably fall onto the conveying unit to be transferred, and the injection molding preparation efficiency of the storage box is effectively improved.

Description

Technical Field

[0001] The invention relates to a production technology of plastic household products, and in particular to an injection molding method of plastic household products. Background Art

[0002] Plastic storage boxes are a common household item in family life. They can not only be used to store food in the kitchen, but also to store clothes, toys, etc., bringing great convenience to people's lives.

[0003] The production method of plastic storage boxes is mainly through injection molding through molds. However, after the existing injection molding equipment prepares and molds the plastic storage boxes, it is usually necessary to demold them with the assistance of a robotic arm, and then place the demolded plastic storage boxes on a conveying device for transportation. However, during the operation of the robotic arm, it not only requires extremely high-precision stroke control, but also requires high-cost maintenance. At the same time, the movement process of the robotic arm is relatively slow and takes more time, which greatly increases the production cost of the plastic storage boxes. Summary of the invention

[0004] The object of the present invention is to provide an injection molding method for plastic household products to solve the above-mentioned deficiencies in the prior art.

[0005] In order to achieve the above object, the present invention provides the following technical solution: a method for injection molding of a plastic household product, comprising the following steps:

[0006] S1. Provide an injection molding device, the injection molding device comprising a machine platform, a feeding unit, a movable mold, and a static mold, the end surface of the movable mold is provided with a boss, a cavity is formed between the movable mold, the static mold and the boss, a feeding unit is provided below the movable mold and the static mold, and a conveying unit is provided below the inside of the machine platform;

[0007] S2, inputting molten plastic fluid into the cavity through the feeding unit, and performing pressure maintenance and cooling to obtain a finished storage box;

[0008] S3, separating the movable mold and the static mold, so that the finished storage box is ejected from the cavity;

[0009] S4, assisting unloading by the unloading unit, so that the finished storage box falls on the conveying unit, and the injection molding preparation of the finished storage box is completed;

[0010] The above-mentioned unloading unit includes unloading plates which are rotatably connected to the bottom of the movable mold and the bottom of the static mold respectively. The bottom of the two unloading plates is rotatably connected to the same material guide box. The two ends of the surface of the two unloading plates facing each other are fixedly connected with multiple groups of elastic wide bands. An auxiliary unit is arranged inside the material guide box, and the auxiliary unit is used to drive the two unloading plates to perform synchronous reverse movement.

[0011] Furthermore, the conveying unit includes a conveying platform arranged below the machine platform, a conveying belt is arranged on the conveying platform, and the conveying belt is arranged below the movable mold and the static mold.

[0012] Furthermore, the auxiliary unit includes a through groove in a rectangular shape opened on the surface of the boss, the inner side surface of the through groove is slidably connected with a push rod, the size specification of the push rod is adapted to the through groove, and the end face of the push rod close to the static mold is flush with the surface of the boss, the end of the push rod away from the static mold is fixedly connected to the same connecting plate, the end of the movable mold away from the static mold is fixedly installed with a control cylinder, the telescopic end of the control cylinder is fixedly connected to the connecting plate, when the control cylinder drives the connecting plate to move toward the side close to the movable mold, the push rod drives the storage box finished product to separate from the boss, and when the storage box finished product is separated from the boss, the position of the storage box finished product corresponds to the material guide box.

[0013] Furthermore, two rotating shafts are symmetrically rotatably connected on both sides of the top of the material guide box, and the bottom ends of the unloading plates on both sides are fixedly connected to the two rotating shafts respectively. A movable cavity is opened inside the material guide box, and the outsides of the two rotating shafts are rotatably connected to the first gears located inside the movable cavity respectively, and the inner side surface of the movable cavity is rotatably connected to two second gears distributed up and down, and the two second gears are meshed with each other, and the upper and lower ends of the inner side surface of the movable cavity are respectively slidably connected to the first rack and the second rack.

[0014] Furthermore, the first rack is meshed with the second gear at the top and the top of the first gear on one side, and the second rack is meshed with the second gear at the bottom and the bottom of the first gear on the other side.

[0015] Furthermore, the shape of the material guiding box is compatible with the finished storage box, and the size of the internal cavity of the material guiding box is greater than the size of the finished storage box.

[0016] Furthermore, guide grooves are symmetrically provided on both sides of the top of the conveying platform, guide blocks are slidably connected to the inner sides of the guide grooves, a connecting frame is fixedly connected to the top of the guide block, and the same auxiliary guide box is fixedly connected between the connecting frames on both sides.

[0017] Furthermore, the auxiliary guide box is slidably connected to the outer surface of the material guide box.

[0018] Furthermore, the auxiliary guide box includes a material unloading section, a contraction section and a material discharging section which are arranged in sequence from top to bottom. The contraction section is arranged in an inward shape from top to bottom, and the shape and size of the internal cavity of the material discharging section are compatible with the finished storage box.

[0019] Furthermore, the distance between the bottom end of the auxiliary guide box and the surface of the conveyor belt is adapted to the height of the finished storage box.

[0020] Compared with the prior art, the injection molding method of a plastic household product provided by the present invention has the following beneficial effects:

[0021] 1. The injection molding method of the plastic household product can quickly eject the storage box after it is formed and guide it for transportation through the use of the unloading unit, so that it can fall smoothly on the conveying unit for transportation, thereby not needing to spend much time on the grasping action of the robot arm, so that the injection molding preparation efficiency of the storage box can be effectively improved.

[0022] 2. The injection molding method of the plastic household product can only make the two side blanking plates rotate synchronously in the opposite direction through the mutual cooperation between the first gear, the second gear, the first rack and the second rack. Therefore, in the process of the movable mold and the static mold approaching each other for mold closing, the two side blanking plates rotate and approach each other, and the two gradually tend to a vertical state, so that the state of the finished storage box can be corrected so that it can smoothly enter the material guide box, thereby ensuring the stability of the finished storage box blanking.

[0023] 3. The injection molding method of the plastic household product can smoothly guide the storage box finished product during the molding and unloading process through the mutual cooperation between the guide groove, the guide block and the auxiliary guide box, and the mutual cooperation between the unloading section, the contraction end and the discharging section can unify the state of the storage box finished product after falling, so as to facilitate the precise grasping of the grasping unit in the subsequent process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0025] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0026] Figure 2 A schematic diagram of a partial cross-sectional structure of a machine provided in an embodiment of the present invention;

[0027] Figure 3A schematic diagram of the structures of a movable mold, a static mold, a material discharge unit and a conveying unit provided in an embodiment of the present invention;

[0028] Figure 4 A schematic diagram of the structure of a movable mold, a static mold and a blanking unit provided in an embodiment of the present invention;

[0029] Figure 5 A schematic diagram of the structure of the movable mold and the static mold in the mold closing state provided by an embodiment of the present invention;

[0030] Figure 6 The embodiment of the present invention provides Figure 5 The enlarged structural diagram at A in the middle;

[0031] Figure 7 A schematic diagram of a partial cross-sectional structure of a material guide box provided in an embodiment of the present invention;

[0032] Figure 8 The embodiment of the present invention provides Figure 7 The enlarged structural diagram at B in the middle;

[0033] Fig. 9 The embodiment of the present invention provides Figure 7 Enlarged structural diagram at point C in the middle.

[0034] Description of reference numerals:

[0035] 1. Machine table; 101. Feeding unit; 102. Moving mold; 103. Static mold; 104. Boss; 105. Cavity; 2. Unloading unit; 21. Unloading plate; 22. Guide box; 23. Elastic wide band; 24. Auxiliary unit; 241. Through slot; 242. Push rod; 243. Connecting plate; 244. Control cylinder; 245. Rotating shaft; 246. First gear; 247. Second gear; 248. First rack; 249. Second rack; 3. Conveying unit; 31. Conveying table; 32. Conveying belt; 4. Finished storage box; 5. Guide slot; 51. Guide block; 52. Connecting frame; 53. Auxiliary guide box; 531. Unloading section; 532. Contraction section; 533. Discharging section. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0037] Embodiment 1:

[0038] See also Figure 1-Figure 9 , a method for injection molding of a plastic household product, comprising the following steps:

[0039] S1. Provide an injection molding device, the injection molding device comprising a machine 1, a feeding unit 101, a movable mold 102, and a static mold 103. The end surface of the movable mold 102 is provided with a boss 104. A cavity 105 is formed between the movable mold 102, the static mold 103, and the boss 104. A feeding unit 2 is provided below the movable mold 102 and the static mold 103. A conveying unit 3 is provided below the machine 1.

[0040] S2, feeding molten plastic fluid into the cavity 105 through the feeding unit 101, and maintaining pressure and cooling to obtain a storage box finished product 4;

[0041] S3, separating the movable mold 102 and the static mold 103, so that the storage box product 4 is removed from the cavity 105;

[0042] S4, performing auxiliary unloading through the unloading unit 2, so that the storage box finished product 4 falls on the conveying unit 3, and the injection molding preparation of the storage box finished product 4 is completed;

[0043] The above-mentioned unloading unit 2 includes unloading plates 21 which are rotatably connected to the bottom of the movable mold 102 and the bottom of the static mold 103 respectively. The bottom of the two unloading plates 21 is rotatably connected to the same material guide box 22. The two ends of the surface of the two unloading plates 21 facing each other are fixedly connected with multiple groups of elastic wide bands 23. An auxiliary unit 24 is arranged inside the material guide box 22. The auxiliary unit 24 is used to drive the two unloading plates 21 to perform synchronous reverse movement.

[0044] It should be noted that when the movable mold 102 moves to the end of the stroke during the separation process from the static mold 103, the distance between the boss 104 and the static mold 103 is greater than the width of the storage box product 4, so that the molded storage box product 4 can be smoothly separated from the boss 104 and fall.

[0045] In this embodiment, the conveying unit 3 includes a conveying platform 31 disposed below the machine platform 1 . A conveying belt 32 is disposed on the conveying platform 31 . The conveying belt 32 is disposed below the movable mold 102 and the static mold 103 .

[0046] In this embodiment, the auxiliary unit 24 includes a rectangular through groove 241 opened on the surface of the boss 104, and the inner side surface of the through groove 241 is slidably connected with a push rod 242. The size specification of the push rod 242 is compatible with the through groove 241, and the end face of the push rod 242 close to the static mold 103 is flush with the surface of the boss 104, and the end of the push rod 242 away from the static mold 103 is fixedly connected to the same connecting plate 243, and the end of the movable mold 102 away from the static mold 103 is fixedly installed with a control cylinder 244, and the telescopic end of the control cylinder 244 is fixedly connected to the connecting plate 243. When the control cylinder 244 drives the connecting plate 243 to move toward the side close to the movable mold 102, the push rod 242 drives the storage box finished product 4 to separate from the boss 104, and when the storage box finished product 4 is separated from the boss 104, the position of the storage box finished product 4 corresponds to the material guide box 22.

[0047] Furthermore, two rotating shafts 245 are symmetrically rotatably connected on both sides of the top of the material guide box 22, and the bottom ends of the material discharge plates 21 on both sides are fixedly connected to the two rotating shafts 245 respectively. A movable cavity is opened inside the material guide box 22, and the outsides of the two rotating shafts 245 are rotatably connected to the first gears 246 located inside the movable cavity respectively, and the inner side surface of the movable cavity is rotatably connected to two second gears 247 distributed up and down, and the two second gears 247 are meshed with each other, and the upper and lower ends of the inner side surface of the movable cavity are respectively slidably connected to the first rack 248 and the second rack 249.

[0048] It should be noted that the first rack 248 meshes with the upper second gear 247 and the upper part of the first gear 246 on one side, and the second rack 249 meshes with the lower second gear 247 and the lower part of the first gear 246 on the other side.

[0049] It should be noted that when the movable mold 102 moves and separates from the static mold 103, the distance between the two gradually increases, so that the top parts of the two side blanking plates 21 can be pulled away from each other. Due to the coordination restriction between the first gear 246, the second gear 247 and the first rack 248, the second rack 249, the two side blanking plates 21 can only rotate synchronously in the opposite direction. Therefore, when the movable mold 102 moves, the two side blanking plates 21 rotate synchronously in the opposite direction, and at the same time, they will also pull the guide box 22 to move in the horizontal direction.

[0050] In this embodiment, the shape of the material guiding box 22 is compatible with the finished storage box 4 , and the size of the internal cavity of the material guiding box 22 is greater than the size of the finished storage box 4 .

[0051] It should be noted that the size of the material guide box 22 is larger than that of the finished product storage box 4, so that the finished product storage box 4 can fall into the material guide box 22 more smoothly, thereby facilitating its transportation.

[0052] During the demolding process of the finished storage box product 4, the movable mold 102 is separated from the static mold 103. When the two separate and move to the end of the stroke, at this time, the control cylinder 244 drives the connecting plate 243 to move toward the side close to the static mold 103. The movement of the connecting plate 243 drives the push rod 242 to move. During the movement of the push rod 242, the finished storage box product 4 will be pushed to move, so that the finished storage box product 4 moves toward the static mold 103 until it is separated from the boss 104. After it is separated from the boss 104, it falls under the action of its own weight and falls into the material guide box 22. Then, it is guided by the material guide box 22 so that it can fall onto the conveyor belt 32 below.

[0053] It should be further explained that, since the storage box is a box with an opening on one side, its center is biased toward the sealing side, which makes it impossible to ensure that it falls in a vertical state during the falling process, and it will deflect, resulting in asymmetric airflow on its surface during the falling process, which aggravates its deflection process and makes it impossible to determine its own state after falling. Through the mutual cooperation between the first gear 246, the second gear 247, the first rack 248, and the second rack 249, the two side unloading plates 21 can only rotate synchronously in the opposite direction, so that in the process of the movable mold 102 and the static mold 103 approaching each other for mold closing, the two side unloading plates 21 rotate and approach each other, and the two gradually tend to a vertical state, so that the state of the storage box finished product 4 can be corrected so that it can smoothly enter the guide box 22, thereby ensuring the stability of the unloading of the storage box finished product 4.

[0054] Embodiment 2:

[0055] See also Figure 3-Figure 5 This embodiment provides a technical solution based on the above embodiment: guide grooves 5 are symmetrically opened on both sides of the top of the conveying platform 31, and the inner side of the guide groove 5 is slidably connected with a guide block 51, and the top of the guide block 51 is fixedly connected with a connecting frame 52, and the same auxiliary guide box 53 is fixedly connected between the connecting frames 52 on both sides.

[0056] It should be noted that the auxiliary guide box 53 is slidably connected to the outer surface of the material guide box 22 .

[0057] In addition, the auxiliary guide box 53 includes a unloading section 531, a contraction section 532 and a discharge section 533 which are arranged in sequence from top to bottom. The contraction section 532 is arranged inwardly from top to bottom, and the shape and size of the internal cavity of the discharge section 533 are compatible with the finished storage box 4.

[0058] In this embodiment, the distance between the bottom end of the auxiliary guide box 53 and the surface of the conveyor belt 32 is adapted to the height value of the storage box finished product 4, so that the storage box finished product 4 can fall smoothly on the surface of the conveyor belt 32, and the position accuracy of the storage box on the conveyor belt 32 is relatively high, thereby facilitating the grabbing unit to grab it in the subsequent process.

[0059] During the movement of the movable mold 102 and the separation of the static mold 103, the movable mold 102 will pull the blanking plate 21 to rotate, and the blanking plate 21 will drive the guide box 22 to move synchronously during the rotation, so that the guide box 22 can move upward while moving horizontally, so that the guide box 22 can slide upward along the inner wall of the auxiliary guide box 53 while driving the auxiliary guide box 53 to move horizontally, and under the cooperation of the guide block 51 and the guide groove 5, the position height between the bottom of the auxiliary guide box 53 and the conveyor belt 32 remains unchanged. After the guide box 22 falls into the auxiliary guide box 53, the finished storage box 4 slides downward along the unloading section 531, the contraction section 532 and the discharging section 533 in sequence, and in the process of falling, its own state gradually changes until it falls on the surface of the conveyor belt 32 from the bottom end of the discharging section 533. This not only allows the finished storage box 4 to fall on the surface of the conveyor belt 32 in a fixed state, but also makes the distance between the position where the finished storage box 4 falls on the conveyor belt 32 and the two sides of the conveying platform 31 relatively constant, making it convenient for the subsequent process grasping unit to perform precise grasping.

[0060] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A method for injection molding of plastic household products, characterized in that: The following steps are involved: S1. An injection molding device is provided, the injection molding device comprising a machine platform (1), a feeding unit (101), a movable mold (102), and a static mold (103); a boss (104) is arranged on the end surface of the movable mold (102); a cavity (105) is formed between the movable mold (102), the static mold (103), and the boss (104); a feeding unit (2) is arranged below the movable mold (102) and the static mold (103); and a conveying unit (3) is arranged below the inside of the machine platform (1); S2, feeding molten plastic fluid into the cavity (105) through the feeding unit (101), and performing pressure maintenance and cooling to obtain a finished storage box (4); S3, separating the movable mold (102) and the static mold (103), so that the storage box finished product (4) is ejected from the inside of the mold cavity (105); S4, performing auxiliary unloading through the unloading unit (2), so that the finished storage box product (4) falls on the conveying unit (3), and the injection molding preparation of the finished storage box product (4) is completed; The above-mentioned unloading unit (2) comprises unloading plates (21) which are rotatably connected to the bottom of the movable mold (102) and the bottom of the static mold (103), respectively. The bottoms of the two unloading plates (21) are rotatably connected to the same material guide box (22). The two ends of the surfaces of the two unloading plates (21) facing each other are respectively fixedly connected to multiple groups of elastic wide bands (23). An auxiliary unit (24) is arranged inside the material guide box (22), and the auxiliary unit (24) is used to drive the two unloading plates (21) to perform synchronous reverse movement.

2. The method for injection molding of a plastic household product according to claim 1, characterized in that: The conveying unit (3) comprises a conveying platform (31) arranged below the machine platform (1); a conveying belt (32) is arranged on the conveying platform (31); and the conveying belt (32) is arranged below the movable mold (102) and the static mold (103).

3. The method for injection molding of a plastic household product according to claim 2, characterized in that: The auxiliary unit (24) comprises a through groove (241) in a rectangular shape and opened on the surface of the boss (104); the inner side surface of the through groove (241) is slidably connected with a push rod (242); the size of the push rod (242) is adapted to the through groove (241); the end surface of the push rod (242) close to the static mold (103) is flush with the surface of the boss (104); the end of the push rod (242) away from the static mold (103) is fixedly connected to the same connecting plate (243); the movable mold (10 2) A control cylinder (244) is fixedly installed at one end away from the static mold (103), and the telescopic end of the control cylinder (244) is fixedly connected to the connecting plate (243). When the control cylinder (244) drives the connecting plate (243) to move toward the side close to the movable mold (102), the push rod (242) drives the storage box finished product (4) to separate from the boss (104), and when the storage box finished product (4) is separated from the boss (104), the position of the storage box finished product (4) corresponds to the material guide box (22).

4. The method for injection molding of a plastic household product according to claim 3, characterized in that: Two rotating shafts (245) are symmetrically rotatably connected on both sides of the top of the material guide box (22), and the bottom ends of the material discharge plates (21) on both sides are fixedly connected to the two rotating shafts (245). A movable cavity is opened inside the material guide box (22), and the outsides of the two rotating shafts (245) are respectively rotatably connected to the first gear (246) located inside the movable cavity. The inner side surface of the movable cavity is rotatably connected to two second gears (247) distributed up and down, and the two second gears (247) are meshed with each other. The upper and lower ends of the inner side surface of the movable cavity are respectively slidably connected to the first rack (248) and the second rack (249).

5. The method for injection molding of a plastic household product according to claim 4, characterized in that: The first rack (248) meshes with the second gear (247) at the top and the top of the first gear (246) at one side, and the second rack (249) meshes with the second gear (247) at the bottom and the bottom of the first gear (246) at the other side.

6. The method for injection molding of a plastic household product according to claim 5, characterized in that: The shape of the material guide box (22) is compatible with the finished storage box (4), and the size of the internal cavity of the material guide box (22) is greater than the size of the finished storage box (4).

7. The method for injection molding of a plastic household product according to claim 6, characterized in that: Guide grooves (5) are symmetrically provided on both sides of the top of the conveying platform (31), the inner side of the guide groove (5) is slidably connected with a guide block (51), the top of the guide block (51) is fixedly connected with a connecting frame (52), and the same auxiliary guide box (53) is fixedly connected between the connecting frames (52) on both sides.

8. The method for injection molding of a plastic household product according to claim 7, characterized in that: The auxiliary guide box (53) is slidably connected to the outer surface of the material guide box (22).

9. The method for injection molding of a plastic household product according to claim 8, characterized in that: The auxiliary guide box (53) comprises a material discharge section (531), a contraction section (532) and a material discharge section (533) which are arranged in sequence from top to bottom. The contraction section (532) is arranged in an inwardly contracted shape from top to bottom. The shape and size of the internal cavity of the material discharge section (533) are compatible with the finished storage box (4).

10. The method for injection molding of a plastic household product according to claim 9, characterized in that: The distance between the bottom end of the auxiliary guide box (53) and the surface of the conveyor belt (32) is matched to the height of the finished storage box (4).

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