Energy-saving injection molding equipment for producing plastic shell of eye protection instrument

Abstract

The invention relates to the technical field of injection molding equipment, in particular to energy-saving injection molding equipment for producing a plastic shell of an eye protection instrument. Comprising a workbench, a hydraulic push rod, an injection molding machine and a male die fixing plate, the hydraulic push rod, the injection molding machine and the male die fixing plate are arranged on the workbench, the telescopic end of the hydraulic push rod is fixedly connected with a female die fixing plate, the female die fixing plate is fixedly connected with a female die part, the male die fixing plate is fixedly connected with a male die part, and the male die part is provided with a male die block. The female die piece, the male die piece and the male die block jointly form a forming cavity, and the workbench is provided with liquid supplementing mechanisms which are symmetrically distributed. The liquid supplementing mechanism comprises a first electric push rod, a material supplementing needle and a communicating assembly. The material injected into the material supplementing needle directly crosses the boundary, with the maximum resistance and the fastest cooling speed, of the outermost side of the material injected into the injection pipeline and enters the interior of the material which is injected firstly, mutual fusion of two strands of molten materials is facilitated, and the probability of weld lines is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding equipment, and particularly relates to an energy-saving injection molding equipment for producing plastic shells of eye massagers. Background Art

[0002] As an intelligent device dedicated to relieving eye fatigue, an eye massager helps improve discomfort symptoms such as dry eyes, soreness, and blurred vision through multiple functions such as acupoint massage, hot compress physiotherapy, and air pressure circulation. Since it needs to fit the facial curve of the human body, the shell of the eye massager often needs to combine aesthetics and ergonomics, which poses strict requirements on the production process.

[0003] The structure of the eye massager shell is complex. When using traditional injection molding technology for production, there is a problem: when the molten material is injected into the mold cavity, the pressure and temperature of the material gradually decay as the flow distance increases, resulting in defects often appearing in the corner areas of the mold cavity due to insufficient pressure, and the finished product of the eye massager shell is prone to weak strength areas, affecting the overall quality of the produced eye massager.

[0004] The existing injection molding equipment usually solves the above problems in two ways: 1. Single-point high-pressure injection molding: By increasing the injection power to forcibly increase the corner pressure, although the probability of defective products can be reduced, because the required energy consumption soars, it is obviously contrary to the concept of green and energy-saving manufacturing.

[0005] 2. Multi-gate collaborative injection molding: Injection ports are opened at different positions of the mold, and feeding is carried out at different times. Theoretically, the pressure of the material in the mold cavity can be evenly distributed, and it is more energy-saving than single-point high-pressure injection molding. However, the amount of data required for this method and the number of special situations to be dealt with are huge. Once there are problems with control accuracy during the injection process, such as the material temperature dropping too fast, uneven temperature and pressure distribution at different injection ports, it will cause a weld line to form at the intersection of different materials when multiple strands of materials spread in the mold cavity. The weld line belongs to a microscopic structure defect, which will lead to a decrease in the overall impact resistance of the shell and an increase in the risk of fracture.

[0006] As described above, how to achieve a balance between energy efficiency control and process complexity has become a technical bottleneck in the mass production of eye massager shells. In response to this industry pain point, the R & D team of our company has proposed an energy-saving injection molding equipment for producing plastic shells of eye massagers. Summary of the Invention

[0007] In order to overcome the defect that the corner areas of the mold cavity of the existing device often have defects due to insufficient pressure holding, and the existing device is difficult to solve the above problems while taking into account energy efficiency control and process complexity, the present invention provides an energy-saving injection molding equipment for producing plastic shells of eye massagers.

[0008] Technical solution: An energy-saving injection molding device for producing a plastic shell of an eye protection instrument, including a workbench, a hydraulic push rod, an injection molding machine and a convex mold fixing plate arranged on the workbench. The telescopic end of the hydraulic push rod is fixedly connected with a concave mold fixing plate, the concave mold fixing plate is fixedly connected with a concave mold part, the convex mold fixing plate is fixedly connected with a convex mold part, the convex mold part is provided with convex mold blocks, and the concave mold part, the convex mold part and the convex mold blocks together form a molding cavity. The injection molding machine is fixedly connected and communicated with an injection pipeline. It is characterized in that the workbench is provided with a liquid supplement mechanism symmetrically distributed; The liquid supplement mechanism includes a first electric push rod, a feeding needle and a connecting component. The first electric push rod is fixedly connected with the workbench, the telescopic end of the first electric push rod is fixedly connected with the feeding needle, the convex mold block is provided with a feeding port communicated with the molding cavity, the feeding needle is coaxial with the feeding port and the outer diameter of the feeding needle is equal to the inner diameter of the feeding port. The feeding needle is used for inserting into the molding cavity to inject molten material, and the connecting component is arranged on the workbench for connecting the feeding needle and the injection molding machine.

[0009] Further, the connecting component includes a connecting cylinder and a blocking component. The connecting cylinder is fixedly connected to the workbench, the connecting cylinder is fixedly connected and communicated with a connecting pipe, the connecting pipe is fixedly connected and communicated with the injection molding machine, the connecting cylinder is slidably connected with the feeding needle, the feeding needle is communicated with the connecting cylinder when inserted into the feeding port, a first stop valve is arranged on the connecting pipe, a second stop valve is arranged on the injection pipeline, and the blocking component is arranged on the convex mold fixing plate for blocking the corresponding feeding port.

[0010] Further, the blocking component includes a steel wire rope, a baffle plate and symmetrically distributed electric rotating shafts. The electric rotating shafts are arranged on the convex mold fixing plate, the steel wire rope is wound around the symmetrically distributed electric rotating shafts at the same time, the steel wire rope penetrates through the convex mold part and the convex mold block and is fixedly connected with the baffle plate, the baffle plate is closely attached to the convex mold block, the baffle plate is used for blocking the corresponding feeding port, and the steel wire rope is used for dragging the baffle plate to slide relative to the convex mold block.

[0011] Further, the baffle plate always covers the position where the steel wire rope penetrates through the convex mold block and enters the molding cavity.

[0012] Further, a guiding part is arranged on one side of the feeding needle close to the adjacent feeding port, and the guiding part is located on the side of the feeding needle close to the injection pipeline.

[0013] Further, it also includes an exhaust mechanism symmetrically distributed. The exhaust mechanism corresponds to the liquid supplement mechanism one by one. The exhaust mechanism is arranged on the workbench. The exhaust mechanism includes a second electric push rod, a sealing member and a leak-proof component. The second electric push rod is fixedly connected to the workbench, and the telescopic end of the second electric push rod is fixedly connected to the sealing member. The punch member, the punch block and the feeding needle are all in sealed sliding connection with the sealing member. The sealing member and the punch block jointly form an exhaust cavity near the corresponding feeding port. The exhaust cavity is communicated with the feeding port. An exhaust port and an exhaust hole which are communicated with each other are arranged in the sealing member. The exhaust port is communicated with the exhaust cavity, and the exhaust hole is communicated with the outside. The leak-proof component is arranged on the sealing member, and the leak-proof component is used for blocking adjacent exhaust holes.

[0014] Further, the length of the guiding part along the axis direction of the feeding needle is greater than the length of the feeding port along the axis direction of the feeding needle.

[0015] Further, the leak-proof component includes a plugging member and a plugging block. The plugging member is slidably connected to the sealing member, and a tension spring is installed between the two. The plugging member is slidably connected to the exhaust port. The plugging block is fixedly connected to the exhaust port in the sealing member. The plugging member is provided with a ventilation channel corresponding to the plugging block, and the plugging block is used for blocking the ventilation channel.

[0016] Further, the exhaust port is located above the adjacent exhaust cavity, and the ventilation channel is located above the adjacent exhaust port.

[0017] Further, the plugging component also includes a magnetic attraction component. The magnetic attraction component is arranged on the punch block. The magnetic attraction component includes symmetrically distributed first magnetic attraction blocks and symmetrically distributed second magnetic attraction blocks. The symmetrically distributed first magnetic attraction blocks are respectively fixedly connected to both sides of the baffle plate, and the symmetry axis of the symmetrically distributed first magnetic attraction blocks is parallel to the moving path of the baffle plate. The symmetrically distributed second magnetic attraction blocks are all fixedly connected inside the punch block, and the first magnetic attraction block is magnetically attracted to the adjacent second magnetic attraction block.

[0018] Compared with the prior art, the present invention has the following advantages: 1. The present invention directly supplements the molten material into the interior of the molten material in the forming cavity through the feeding needle to make up the pressure at the corners of the forming cavity, rather than relying on increasing the power consumption of the injection molding machine in the prior art to apply pressure to the material at the corners of the forming cavity. It has a low dependence on large energy-consuming components, conforms to the strategic concept of energy-saving and green development, and the material injected into the feeding needle directly crosses the boundary where the resistance of the material injected through the injection pipeline is the greatest and the cooling is the fastest, and enters the interior of the previously injected material, which is more conducive to the mutual fusion of the two molten materials and reduces the probability of the appearance of weld lines.

[0019] 2. In the present invention, the molten material in the feeding needle discharges the air in the feeding needle and the air in the exhaust cavity outwards, so as to reduce the probability that the feeding needle brings air bubbles into the molding cavity when the feeding needle passes through the feeding port and enters the molding cavity. At the same time, because the exhaust cavity is pre-filled with material, when the baffle is opened and the feeding needle is ready to be inserted into the feeding port or pulled out of the feeding port, it is difficult for the material in the molding cavity to flow into the exhaust cavity, thereby reducing the amount of material leaked out of the molding cavity when the baffle is opened and reducing the difficulty of maintaining pressure on the molten material in the molding cavity by the injection pipeline.

[0020] 3. In the present invention, the first magnetic attraction block and the second magnetic attraction block attract each other magnetically, enhancing the extrusion force between the baffle and the convex module and reducing the probability that the molten material enters between the convex module and the baffle. Description of the Drawings

[0021] Figure 1 is a three-dimensional structural schematic diagram of the present invention; Figure 2 is a three-dimensional structural schematic diagram of the punch fixing plate and the die fixing plate of the present invention; Figure 3 is a three-dimensional structural schematic diagram of the die part and the die groove of the present invention; Figure 4 is a three-dimensional structural schematic diagram of the punch fixing plate and the punch part of the present invention; Figure 5 is a sectional view of the punch fixing plate and the punch part of the present invention; Figure 6 is a sectional view of the workbench and the connecting cylinder of the present invention; Figure 7 is a sectional view of the punch part and the convex module of the present invention; Figure 8 is a three-dimensional structural schematic diagram of the sealing part and the exhaust cavity of the present invention; Figure 9 is a sectional view of the sealing part of the present invention; Figure 10 is a three-dimensional structural schematic diagram of the feeding needle and the sealing part of the present invention; Figure 11 is a three-dimensional structural schematic diagram of the sealing part and the plugging part of the present invention; Figure 12 is a three-dimensional structural schematic diagram of the first magnetic attraction block and the second magnetic attraction block of the present invention; Figure 13 is a three-dimensional structural schematic diagram of the electric rotating shaft and the steel wire rope of the present invention.

[0022] In the figure: 1. Workbench, 11. Hydraulic push rod, 12. Injection molding machine, 121. Injection pipe, 13. Control terminal, 14. Discharge port, 15. Scrap port, 2. Punch fixing plate, 21. Die fixing plate, 22. Die part, 221. Die groove, 23. Punch part, 231. Punch block, 232. Feeding port, 24. Guide pillar, 3. First electric push rod, 31. Feeding needle, 311. Guide part, 4. Connecting cylinder, 41. Connecting pipe, 411. Liquid storage cavity, 42. First stop valve, 43. Second stop valve, 5. Second electric push rod, 51. Sealing part, 511. Exhaust cavity, 512. Exhaust port, 513. Exhaust hole, 52. Blocking part, 521. Vent passage, 522. Blocking block, 6. Electric rotating shaft, 61. Steel wire rope, 62. Baffle plate, 63. First magnetic block, 64. Second magnetic block, 65. Guide wheel, 100. Plastic shell. Detailed implementation mode

[0023] Although the present invention may be described with respect to a particular application or industry, those skilled in the art will recognize the broader applicability of the present invention. Those of ordinary skill in the art will recognize that terms such as: up, left, right, etc. are used to describe the drawings and do not represent a limitation on the scope of the present invention. Any numerical labels such as: first or second are merely illustrative and are not intended to limit the scope of the present invention in any way.

[0024] Example 1, this example discloses an energy-saving injection molding device for producing the plastic shell of an eye massager, which is used to produce the plastic shell 100 of the eye massager.

[0025] Refer to Figures 1 - 5 , the injection molding device includes a workbench 1, and a hydraulic push rod 11, an injection molding machine 12, a punch fixing plate 2 and symmetrically distributed liquid supplement mechanisms arranged on the workbench 1. The telescopic end of the hydraulic push rod 11 is fixedly connected with a die fixing plate 21, the die fixing plate 21 is fixedly connected with a die part 22, the punch fixing plate 2 is fixedly connected with a punch part 23, the die part 22 is provided with a die groove 221, the punch part 23 is provided with a punch block 231, the die groove 221, the punch part 23 and the punch block 231 on the die part 22 correspond to each other and jointly form a molding cavity. The injection molding machine 12 is provided with an injection pipe 121, the injection pipe 121 is fixedly connected with the punch fixing plate 2 and communicates with the molding cavity. The injection molding machine 12 injects molten material into the molding cavity through the injection pipe 121 to produce the plastic shell 100 of the eye massager (such as Figure 4 and Figure 5As shown in the figure, during the injection process, the injection molding machine 12 first injects the molten material into the molding cavity through the injection pipeline 121. When the molten material fills the molding cavity (or is about to fill the molding cavity), the liquid supplement mechanism supplements new molten material into the interior of the molten material in the molding cavity, and the molten material cools to form the plastic shell 100 under the condition that the pressure is relatively sufficient everywhere.

[0026] The specific structures and connection relationships of the above-mentioned components are as follows: Workbench 1, hydraulic push rod 11, injection molding machine 12, punch fixing plate 2 and die fixing plate 21: Refer to Figures 1 - 3 , a control terminal 13 and a blanking port 14 are arranged on the workbench 1. The control terminal 13 is fixedly connected to the workbench 1. The hydraulic push rod 11 is electrically connected to the control terminal 13. The blanking port 14 is located below the punch fixing plate 2 and the die fixing plate 21. The punch fixing plate 2 and the die fixing plate 21 correspond to each other in the horizontal direction, and the two are connected by guide posts 24 (as shown in Figure 2 and Figure 3 ), the punch part 23 is provided with a positioning block for ensuring the alignment of the die groove 221 and the punch block 231, the die part 22 is provided with a positioning groove aligned with the positioning block on the punch part 23, and a screw feeding mechanism (an existing device, not shown in the figure) is arranged in the injection molding machine 12.

[0027] The die fixing plate 21 and the punch fixing plate 2 are jointly provided with a cooling component (an existing device, not shown in the figure). The cooling component cools the die part 22 and the punch part 23 through cooling water. The punch fixing plate 2 is provided with an automatic unloading component and a vacuum pumping component (an existing device, not shown in the figure). The automatic unloading component is used to automatically push down the plastic shell 100 formed on the punch part 23. The vacuum pumping component is used to pump the molding cavity into a vacuum state. The injection molding machine 12 is provided with a heat preservation component (an existing device, not shown in the figure). The heat preservation component is used to heat and keep warm the molten material in the injection molding machine 12 to keep the molten material in a molten state. The cooling component, the automatic unloading component, the vacuum pumping component and the heat preservation component are electrically connected to the control terminal 13.

[0028] The above settings can achieve that during the production process, the heat preservation component continuously heats and keeps the molten material in the injection molding machine 12 warm. After the female die part 22 and the male die part 23 are fitted to form the molding cavity, the vacuum pumping component evacuates the molding cavity to a vacuum state, reducing the probability of bubbles appearing during the material injection process. When the injection molding machine 12 fills the molding cavity with molten material, the cooling component cools down the female die part 22 and the male die part 23, accelerating the cooling process of the material in the molding cavity. When the material cools and forms the plastic shell 100, when the female die part 22 and the male die part 23 are separated, the automatic unloading component pushes the plastic shell 100 on the male die part 23, causing the plastic shell 100 to fall downward to the blanking port 14, completing the process of automatically collecting the plastic shell 100.

[0029] Liquid supplement mechanism: Refer to Figure 4 , two liquid supplement mechanisms are respectively located on the front and back sides of the injection pipeline 121. The liquid supplement mechanism includes a first electric push rod 3, a feeding needle 31 and a connecting component.

[0030] Refer to Figures 5 - 8 , the first electric push rod 3 is electrically connected to the control terminal 13. The first electric push rod 3 is fixedly connected to one side of the workbench 1 close to the injection molding machine 12. The telescopic end of the first electric push rod 3 is fixedly connected to the feeding needle 31 (as Figure 7 shown), a feeding port 232 is arranged on the left part of the convex module 231 (as Figure 8 shown), the feeding port 232 is communicated with the molding cavity, the feeding needle 31 is coaxial with the feeding port 232, and the leftmost end of the feeding needle 31 is communicated with the feeding port 232 and the molding cavity (as Figure 8 shown). The outer diameter of the feeding needle 31 is equal to the inner diameter of the adjacent feeding port 232. The workbench 1 is provided with a connecting component.

[0031] Refer to Figure 5 and Figure 6 , the connecting component includes a connecting cylinder 4 and a plugging component.

[0032] Refer to Figure 5 and Figure 6 , the connecting cylinder 4 is fixedly connected to one side of the workbench 1 close to the feeding needle 31. The connecting cylinder 4 is located on the right side of the adjacent feeding needle 31. The connecting cylinder 4 is coaxial with the feeding needle 31 and is in sealed sliding connection with it (as Figure 5 and Figure 6 shown). A connecting pipe 41 is fixedly connected between the connecting cylinder 4 and the injection molding machine 12. The heat preservation component on the injection molding machine 12 keeps the connecting cylinder 4 and the connecting pipe 41 warm together. A liquid storage cavity 411 is arranged in the connecting pipe 41. One end of the connecting pipe 41 is communicated with the liquid storage cavity 411, the other end of the connecting pipe 41 is communicated with the injection molding machine 12, and the rightmost end of the feeding needle 31 is communicated with the liquid storage cavity 411 (as Figure 6As shown in the figure, a first stop valve 42 is provided on the connecting pipe 41, a second stop valve 43 is provided at the injection pipeline 121, and the plugging assembly is arranged on the punch fixing plate 2. The plugging assembly is used to plug the corresponding feeding port 232. The first stop valve 42, the second stop valve 43 and the plugging assembly are all electrically connected to the control terminal 13.

[0033] The above settings can achieve that when the telescopic end of the first electric push rod 3 extends, it drives the feeding needle 31 to move along the axial direction of the feeding port 232. When the feeding needle 31 moves to contact the feeding port 232, the right end of the feeding needle 31 is communicated with the liquid storage cavity 411. The material in the injection molding machine 12 flows along the connecting pipe 41, the liquid storage cavity 411, and the right end of the feeding needle 31 to the left end of the feeding needle 31. When the feeding needle 31 passes through the feeding port 232 and enters the interior of the molten material in the molding cavity, the molten material in the feeding needle 31 is directly injected into the interior of the molten material injected first in the molding cavity. Compared with the existing direct injection method, the later-injected molten material directly enters the middle position of the previously injected molten material, which is more conducive to the mutual fusion of the two materials; the first stop valve 42 is used to control whether the adjacent connecting pipe 41 is communicated with the injection molding machine 12, and the second stop valve 43 is used to control whether the adjacent injection pipeline 121 injects material into the molding cavity.

[0034] Reference Figures 7 - 10 , the plugging mechanism includes a steel wire rope 61, a baffle 62 and symmetrically distributed electric rotating shafts 6.

[0035] Reference Figure 5 、 Figures 7 - 10 、 Figure 12 and Figure 13 , the symmetrically distributed electric rotating shafts 6 are all arranged on the punch fixing plate 2. The electric rotating shafts 6 are electrically connected to the control terminal 13. The feeding port 232 is located on the symmetry plane of two adjacent and symmetrically distributed electric rotating shafts 6 (as shown in Figure 5 ), the two ends of the steel wire rope 61 are respectively wound around the two symmetrically distributed electric rotating shafts 6. The baffle 62 is located on the left side of the punch block 231. The leftmost end of the feeding needle 31 never contacts the baffle 62. The steel wire rope 61 penetrates through the punch part 23 and the punch block 231 and is fixedly connected to the baffle 62. The baffle 62 is in close fit with the punch block 231 under the pulling force of the steel wire rope 61 (as shown in Figure 8 ). Each electric rotating shaft 6 can wind multiple steel wire ropes 61, but the steel wire ropes 61 on the same electric rotating shaft 6 are only fixedly connected to the same baffle 62. The punch fixing plate 2 is fixedly connected with spaced guide wheels 65, and the guide wheels 65 guide the adjacent steel wire ropes 61.

[0036] Reference Figure 9 and Figure 13 , the baffle 62 always covers the part of the steel wire rope 61 located in the molding cavity.

[0037] The above settings can achieve the following: when the feeding needle 31 does not need to pass through the feeding port 232 and enter the molding cavity, the baffle 62 blocks the feeding port 232 to prevent the material in the molding cavity from gushing out through the feeding port 232. When the feeding needle 31 is ready to be inserted into the molding cavity, two adjacent and symmetrically distributed electric rotating shafts 6 rotate in the same direction, dragging the steel wire rope 61 to drive the baffle 62 to move, so that the baffle 62 releases the blockage of the adjacent feeding port 232, enabling the feeding needle 31 to pass through the feeding port 232; since the baffle 62 always covers the part of the steel wire rope 61 located in the molding cavity, the steel wire rope 61 will not contact the molten material at the penetration point of the feeding port 232, and the molten material will not hinder the movement of the steel wire rope 61 due to sticking to the steel wire rope 61.

[0038] The working process of the energy-saving injection molding equipment for producing the plastic shell 100 of the eye massager in this embodiment is as follows: Injection preparation process: The staff sprays the mold release agent on the concave die groove 221 and the convex die block 231, and starts the heat preservation device on the injection molding machine 12 through the control terminal 13. Subsequently, the staff adds materials into the injection molding machine 12, and the materials gradually melt under the action of the heat preservation device. At this time, the baffle 62 is located at the position blocking the adjacent feeding port 232.

[0039] Subsequently, the control terminal 13 controls the telescopic end of the hydraulic push rod 11 to drive the concave die fixing plate 21 and the concave die part 22 to move to the right until the concave die part 22 is in close fit with the convex die part 23. The control terminal 13 closes the hydraulic push rod 11 and starts the vacuum pumping component. The vacuum pumping component evacuates the molding cavity to a vacuum state, reducing the flow resistance of the material in the molding cavity and simultaneously reducing the probability of bubbles appearing after the material is injected into the molding cavity. Subsequently, the control terminal 13 closes the vacuum pumping component.

[0040] Injection process: The control terminal 13 first opens the second stop valve 43, and the injection molding machine 12 injects the molten material therein into the molding cavity through the injection pipeline 121. When the molten material gradually fills the molding cavity (or is about to fill the molding cavity), the control terminal 13 opens the two first stop valves 42, and the injection molding machine 12 simultaneously transports the materials therein to the liquid storage cavity 411 through the two connecting pipes 41. The control terminal 13 controls the telescopic ends of the two first electric push rods 3 to extend to the left together. Taking the first electric push rod 3 on the front side as an example; the telescopic end of the first electric push rod 3 drives the adjacent feeding needle 31 to extend to the left until the feeding needle 31 moves to the corresponding feeding port 232. At this time, the feeding needle 31 does not enter the corresponding feeding port 232. The control terminal 13 closes the first electric push rod 3, and the baffle 62 still blocks the adjacent feeding port 232. The right end of the feeding needle 31 is communicated with the liquid storage cavity 411, and the molten material in the liquid storage cavity 411 flows through the feeding needle 31 to the feeding port 232, squeezing out the air existing in the feeding needle 31 and the feeding port 232.

[0041] After the air in the feeding needle 31 is exhausted, the control terminal 13 controls the two electric rotating shafts 6 to work. The two electric rotating shafts 6 rotate counterclockwise (viewed from top to bottom), and drive the steel wire rope 61 to drive the baffle 62 to move forward. The baffle 62 gradually releases the blockage of the feeding port 232. Subsequently, the control terminal 13 closes the two electric rotating shafts 6, and at the same time controls the telescopic end of the first electric push rod 3 to continue to extend to the left, so that the telescopic end of the first electric push rod 3 inserts and passes through the feeding port 232 with the feeding needle 31. The leftmost end of the feeding needle 31 enters the interior of the molten material in the molding cavity. When the left end of the feeding needle 31 enters the middle of the molding cavity, the control terminal closes the first electric push rod 3, and the feeding needle 31 stops moving. At this time, the feeding needle 31 is hermetically attached to the feeding port 232, and the molten material in the liquid storage cavity 411 is supplemented into the interior of the molten material in the molding cavity through the feeding needle 31, increasing the pressure on the molten material at the corners of the molding cavity.

[0042] Among them, since the material injected into the molding cavity by the feeding needle 31 directly enters the interior of the material injected by the injection pipeline 121, rather than relying on increasing the power consumption of the injection molding machine 12 in the existing device to apply pressure to the material at the corners of the molding cavity, the dependence of this device on large energy-consuming components is reduced, which conforms to the concept of the green development strategy. Moreover, the material injected into the feeding needle 31 directly crosses the outermost boundary of the material injected by the injection pipeline 121, where the resistance is the greatest and the cooling is the fastest, and enters the interior position of the previously injected material, so that the subsequently injected material pushes the previously injected material to continue to flow. Compared with the existing technology where the two materials intersect with each other, it is more conducive to the mutual fusion between the subsequently injected material and the previously injected material, reducing the probability of the appearance of weld lines.

[0043] When the injection process is over, the control terminal controls the telescopic end of the first electric push rod 3 to drive the feeding needle 31 to retract to the right for reset. The feeding needle 31 replenishes the liquid into the gap that appears when it moves out of the molding cavity during the movement. When the leftmost end of the feeding needle 31 driven by the telescopic end of the first electric push rod 3 moves into the feeding port 232, the control terminal 13 closes the two first stop valves 42, so that the injection molding machine 12 stops injecting molten material into the feeding needle 31. At the same time, the control terminal 13 controls the two electric rotating shafts 6 to drive the steel wire rope 61 and the baffle 62 to move back to their original positions together. The baffle 62 re-blocks the feeding port 232 to prevent the material in the molding cavity from continuously flowing out through the feeding port 232. The telescopic end of the first electric push rod 3 continues to drive the feeding needle 31 to reset to the right. The feeding needle 31 moves out of the convex mold part 23. At this time, the injection pipeline 121 mainly provides the holding pressure required for the material in the molding cavity. The control terminal 13 starts the cooling component, and the cooling component cools the concave mold part 22, the convex mold part 23 and the molten material in the molding cavity.

[0044] The feeding needle 31 resets to the connection cylinder 4, and the heat preservation component on the injection molding machine 12 heats the connection cylinder 4, the connecting pipe 41 and the feeding needle 31 to prevent the material from solidifying and blocking.

[0045] Unloading process: After the material is cooled to form the plastic shell 100, the control terminal 13 closes the cooling component and the second cut-off valve 43. The control terminal 13 controls the hydraulic push rod 11 to drive the female die fixing plate 21 and the female die part 22 to move back to their original positions, and the automatic unloading component on the male die fixing plate 2 pushes the plastic shell 100 on the male die part 23 down. The plastic shell 100 falls to the blanking port 14 for unified collection, completing the process of manufacturing one plastic shell 100.

[0046] Repeat the above steps repeatedly. After the last plastic shell 100 is produced, the control terminal 13 shuts down the injection molding machine 12 and performs corresponding cleaning on the injection molding machine 12.

[0047] Example 2, an energy-saving injection molding device for producing the plastic shell of an eye protection instrument disclosed in this example. On the basis of Example 1, the shape and structure of the filling needle 31 are further improved, so that the filling needle 31 has the function of guiding the molten material injected into it.

[0048] The specific structures, connection relationships and working processes of the components in Example 1 will not be elaborated again.

[0049] Refer to Figure 8 and Figure 9 , a guiding part 311 is arranged at the left end of the filling needle 31, and the guiding part 311 is located on the side of the filling needle 31 close to the injection pipeline 121.

[0050] The above structure can achieve that the guiding part 311 guides the molten material injected by the filling needle 31 into the molding cavity to the side away from the injection pipeline 121. Since this direction is similar to the flowing direction of the material injected from the injection pipeline 121 into the molding cavity, the angle difference between the flowing directions of the two materials is reduced, which is more conducive to the co-directional flow and mutual fusion of the two materials.

[0051] Example 3, an energy-saving injection molding device for producing the plastic shell of an eye protection instrument disclosed in this example. On the basis of Example 2, it also has the function of eliminating the air bubbles between the filling needle 31 and the filling port 232.

[0052] The specific structures, connection relationships and working processes of the components in the above examples will not be elaborated again. The exhaust mechanism will be mainly described.

[0053] The injection molding device in Example 2 further includes symmetrically distributed exhaust mechanisms. The exhaust mechanisms correspond to the liquid supplement mechanisms one by one. The exhaust mechanism includes a second electric push rod 5, a sealing part 51 and a leak-proof component. The specific structures and connection relationships of each component are as follows: The second electric push rod 5 and the sealing part 51: Refer to Figures 5 - 10, the second electric push rod 5 is fixedly connected to the right part of the workbench 1, the telescopic end of the second electric push rod 5 is fixedly connected to the sealing member 51, the sealing member 51 penetrates through the punch member 23 and the punch block 231 (as Figure 7 shown), and the three are in sealed sliding connection. The feeding needle 31 penetrates through the sealing member 51 and is in sealed sliding connection with it (as Figure 8 shown). The left side of the sealing member 51 and the punch block 231 together form an exhaust cavity 511 (as Figure 9 shown). The exhaust cavity 511 is located on the right side of the feeding port 232 and the two are interconnected. An exhaust port 512 and an exhaust hole 513 that are interconnected are provided in the sealing member 51 (as Figure 10 shown). The exhaust port 512 is connected to the exhaust cavity 511, and the exhaust hole 513 is connected to the outside. The length of the guiding portion 311 in the left-right direction is greater than the length of the feeding port 232 in the left-right direction (as Figure 9 shown).

[0054] Leakage prevention component: The leakage prevention component includes a plugging member 52 and a plugging block 522.

[0055] Referring to Figures 9 - 11 , the plugging member 52 is slidably connected to the sealing member 51 (as Figure 9 shown), and a tension spring is installed between the two. One end of the plugging member 52 is located outside the sealing member 51 (as Figure 10 shown), and the other end of the plugging member 52 is located in the exhaust port 512 and is slidably connected to the exhaust port 512 (as Figure 11 shown). The plugging member 52 is provided with a ventilation channel 521 (as Figure 11 shown). The ventilation channel 521 is located in the upper part of the plugging member 52. The exhaust port 512 is located in the upper part of the adjacent exhaust cavity 511 (as Figure 10 shown). The plugging block 522 is fixedly connected to the upper part at the exhaust port 512 in the sealing member 51. The shape of the cross-section of the plugging block 522 is the same as the shape of the cross-section of the ventilation channel 521 (as Figure 11 shown), and the areas of their cross-sections are equal. When the plugging block 522 is inserted into the ventilation channel 521, the plugging block 522 and the plugging member 52 complete the sealing of the exhaust port 512. A waste discharging component (using an existing device and having the same principle as the automatic discharging component, not shown in the figure) is provided in the sealing member 51. The waste discharging component is used to discharge the waste in the exhaust cavity 511 to the outside. The workbench 1 is provided with a waste port 15, and the waste port 15 is used to guide the waste discharged by the waste discharging component to the outside.

[0056] The above settings can achieve that when the molten material in the feeding needle 31 flows from right to left, the air in the feeding needle 31 is discharged outwards through the feeding needle 31, the convex module 231, the exhaust cavity 511, the exhaust port 512 and the exhaust hole 513. When the molten material in the feeding needle 31 flows from its right end to the exhaust cavity 511, the molten material gushes into the exhaust cavity 511 through the gap between the guiding part 311 and the feeding port 232. While filling the exhaust cavity 511, the air in the exhaust cavity 511 is extruded outwards. Because the exhaust cavity 511 is pre-filled with molten material, when the baffle 62 is opened, it is difficult for the molten material in the molding cavity to flow towards the exhaust cavity 511; the waste discharging assembly is used to push the waste in the sealing member 51 outwards, so that the waste automatically falls into the waste port 15, thereby realizing the function of automatically cleaning the waste.

[0057] The working process of this embodiment follows that of Embodiment 1 and is described in detail as follows: Before the control terminal 13 starts the first electric push rod 3, the second electric push rod 5 is first started. The telescopic end of the second electric push rod 5 drives the sealing member 51 to move leftwards until the left side surface of the sealing member 51 contacts the convex module 231. Subsequently, the control terminal 13 closes the second electric push rod 5 and starts the first electric push rod 3 to work in the order of Embodiment 1. At this time, the first electric push rod 3 can directly insert the feeding needle 31 into the feeding port 232, and only need to ensure that the feeding needle 31 stops at a position where it does not contact the baffle 62.

[0058] When the material in the liquid storage cavity 411 flows towards the feeding port 232 through the feeding needle 31, the air in the feeding needle 31 is discharged outwards through the feeding needle 31, the convex module 231, the exhaust cavity 511, the exhaust port 512 and the exhaust hole 513. After the air in the feeding needle 31 is exhausted, the molten material in the feeding needle 31 gushes into the exhaust cavity 511 through the gap between the guiding part 311 and the feeding port 232, and extrudes the air in the exhaust cavity 511 outwards, avoiding the air bubbles in the exhaust cavity 511 being brought into the molding cavity when the feeding needle 31 is inserted into the feeding port 232.

[0059] When the molten material in the exhaust cavity 511 exceeds the height of the feeding needle 31, while the molten material fills the exhaust cavity 511, the molten material squeezes the blocking member 52 to the right. The blocking member 52 drives the air passage 521 thereon to move to the right together. The tension spring on the blocking member 52 stretches and stores energy. The air passage 521 on the blocking member 52 fits with the blocking block 522, and the two jointly block the exhaust port 512, preventing the material in the exhaust cavity 511 from leaking out through the exhaust hole 513. At the same time, because the exhaust cavity 511 is pre-filled with material, when the baffle 62 is opened and the feeding needle 31 is about to be inserted into the feeding port 232 or when the feeding needle 31 is about to be pulled out of the feeding port 232, it is difficult for the material in the molding cavity to leak to the exhaust cavity 511. Furthermore, when the feeding needle 31 is inserted into or pulled out of the feeding port 232, the amount of material leaking out of the molding cavity is reduced, thereby reducing the pressure maintaining difficulty of the injection pipeline 121.

[0060] When the control terminal 13 controls the first electric push rod 3 to pull out the feeding needle 31 from the feeding port 232, after the control terminal 13 blocks the feeding port 232 with the baffle 62, it controls the telescopic end of the first electric push rod 3 to retract to the right for reset. At this time, the telescopic ends of the second electric push rod 5 and the sealing member 51 have no movement.

[0061] When the material is cooled and molded, when the control terminal 13 controls the telescopic end of the hydraulic push rod 11 to move for reset, it synchronously controls the telescopic end of the second electric push rod 5 to drive the sealing member 51 to move to the right for reset. The sealing member 51 disengages from the contact with the convex die member 23. The control terminal 13 controls the waste discharging assembly in the sealing member 51 to work, pushing the waste filled in the exhaust cavity 511 outwards. The waste falls at the waste port 15 for unified collection.

[0062] Embodiment 4, an energy-saving injection molding device for producing a plastic shell of an eye massager disclosed in this embodiment, on the basis of Embodiment 1, also has the function of enhancing the sealing strength between the baffle 62 and the convex block 231.

[0063] The specific structures, connection relationships and working processes of the components in Embodiment 1 will not be elaborated again. The magnetic attraction assembly will be mainly described.

[0064] The blocking assembly in Embodiment 1 further includes a magnetic attraction assembly. The magnetic attraction assembly is arranged in the convex block 231. The magnetic attraction assembly includes symmetrically distributed first magnetic attraction blocks 63 and symmetrically distributed second magnetic attraction blocks 64. The specific structures and connection relationships are as follows: Referring to Figure 9 and Figure 12 , the vertically symmetrically distributed first magnetic attraction blocks 63 are respectively fixedly connected to the upper and lower sides of the baffle 62 (as Figure 12As shown in the figure, the symmetry axis of the first magnetic attraction blocks 63 symmetrically distributed up and down is parallel to the movement path of the baffle 62. The second magnetic attraction blocks 64 symmetrically distributed up and down are fixedly connected in the convex module 231, and the two second magnetic attraction blocks 64 are respectively located on the upper and lower sides of the adjacent feeding ports 232. The first magnetic attraction block 63 and the adjacent second magnetic attraction block 64 are magnetically attracted to each other. The first magnetic attraction block 63 is made of a material susceptible to magnetic attraction (such as iron). The length of the first magnetic attraction block 63 is greater than or equal to the sum of the length of the second magnetic attraction block 64 and the stroke length of the baffle 62. The second magnetic attraction block 64 is a high-temperature resistant magnet (such as samarium cobalt magnet or alnico magnet).

[0065] The above settings can achieve that the second magnetic attraction block 64 always magnetically attracts the adjacent first magnetic attraction block 63, increasing the extrusion force between the first magnetic attraction block 63 and the baffle 62 and the convex module 231, and reducing the probability of molten material entering between the convex module 231 and the baffle 62.

[0066] The above embodiments are provided for those skilled in the art to implement or use the present invention. Those skilled in the art can make various modifications or changes to the above embodiments without departing from the inventive concept of the present invention. Therefore, the protection scope of the present invention is not limited by the above embodiments, but should be the maximum scope that conforms to the innovative features covered by the present invention.

Claims

1. An energy-saving injection molding device for producing a plastic shell of an eye protector, comprising a workbench (1), and a hydraulic push rod (11), an injection molding machine (12) and a punch fixing plate (2) arranged on the workbench (1), wherein the telescopic end of the hydraulic push rod (11) is fixedly connected to a die fixing plate (21), the die fixing plate (21) is fixedly connected to a die member (22), the punch fixing plate (2) is fixedly connected to a die member (23), the die member (23) is provided with a convex module (231), the die member (22), the convex module (231) and the convex module (231) together constitute a molding cavity, the injection molding machine (12) is fixedly connected to and communicated with an injection pipe (121), and is characterized in that: The workbench (1) is provided with symmetrically distributed fluid replenishing mechanisms; The liquid replenishing mechanism comprises a first electric push rod (3), a material replenishing needle (31) and a connecting component, wherein the first electric push rod (3) is fixedly connected to the workbench (1), the telescopic end of the first electric push rod (3) is fixedly connected to the material replenishing needle (31), the convex module (231) is provided with a material replenishing port (232) connected to the molding cavity, the material replenishing needle (31) and the material replenishing port (232) are coaxial, and the outer diameter of the material replenishing needle (31) is equal to the inner diameter of the material replenishing port (232), the material replenishing needle (31) is used to be inserted into the molding cavity to inject molten material, and the connecting component is provided on the workbench (1) and is used to connect the material replenishing needle (31) with the injection molding machine (12).

2. An energy-saving injection molding device for producing a plastic shell of an eye protector according to claim 1, characterized in that: The connecting component comprises a connecting cylinder (4) and a plugging component, wherein the connecting cylinder (4) is fixedly connected to the workbench (1), the connecting cylinder (4) is fixedly connected to and connected with a connecting pipe (41), the connecting pipe (41) is fixedly connected to and connected with the injection molding machine (12), the connecting cylinder (4) is slidably connected to the feeding needle (31), the feeding needle (31) is connected with the connecting cylinder (4) when inserted into the feeding port (232), the connecting pipe (41) is provided with a first stop valve (42), the injection pipeline (121) is provided with a second stop valve (43), and the plugging component is provided on the punch fixing plate (2), and the plugging component is used to plug the corresponding feeding port (232).

3. An energy-saving injection molding device for producing a plastic shell of an eye protector according to claim 2, characterized in that: The blocking assembly comprises a steel wire rope (61), a baffle plate (62) and a symmetrically distributed electric rotating shaft (6); the electric rotating shaft (6) is arranged on the punch fixing plate (2); the steel wire rope (61) is wound around the symmetrically distributed electric rotating shaft (6); the steel wire rope (61) penetrates the punch member (23) and the convex module (231) and is fixedly connected to the baffle plate (62); the baffle plate (62) is tightly fitted to the convex module (231); the baffle plate (62) is used to block the corresponding feeding port (232); and the steel wire rope (61) is used to drag the baffle plate (62) to slide relative to the convex module (231).

4. The energy-saving injection molding equipment for producing the plastic shell of the eye protector according to claim 3 is characterized in that: The baffle (62) always covers the position where the steel wire rope (61) penetrates the convex module (231) and enters the molding cavity.

5. The energy-saving injection molding equipment for producing the plastic shell of the eye protector according to claim 2 is characterized in that: A guide portion (311) is provided on a side of the feed needle (31) close to the feed port (232), and the guide portion (311) is located on a side of the feed needle (31) close to the injection pipe (121).

6. An energy-saving injection molding device for producing a plastic shell of an eye protector according to claim 5, characterized in that: The invention also comprises symmetrically distributed exhaust mechanisms, the exhaust mechanisms corresponding to the liquid replenishing mechanisms one by one, the exhaust mechanisms being arranged on the workbench (1), the exhaust mechanisms comprising a second electric push rod (5), a sealing member (51) and a leak-proof component, the second electric push rod (5) being fixedly connected to the workbench (1), the telescopic end of the second electric push rod (5) being fixedly connected to the sealing member (51), the male mold member (23), the male mold member (231) and the replenishing needle (31) being all sealingly and slidably connected to the sealing member (51), the sealing member The sealing member (51) and the convex module (231) form an exhaust cavity (511) together with the corresponding feeding port (232), the exhaust cavity (511) is in communication with the feeding port (232), the sealing member (51) is provided with an exhaust port (512) and an exhaust hole (513) which are in communication with each other, the exhaust port (512) is in communication with the exhaust cavity (511), and the exhaust hole (513) is in communication with the outside, the leak-proof component is provided on the sealing member (51), and the leak-proof component is used to block the adjacent exhaust holes (513).

7. An energy-saving injection molding device for producing a plastic shell of an eye protector according to claim 6, characterized in that: The length of the guide portion (311) along the axial direction of the feed needle (31) is greater than the length of the feed port (232) along the axial direction of the feed needle (31).

8. The energy-saving injection molding equipment for producing the plastic shell of the eye protector according to claim 6 is characterized in that: The anti-leakage component comprises a blocking member (52) and a blocking block (522); the blocking member (52) is slidably connected to the sealing member (51), and a tension spring is installed between the two; the blocking member (52) is slidably connected to the exhaust port (512), the blocking block (522) is fixedly connected to the exhaust port (512) in the sealing member (51); the blocking member (52) is provided with an air passage (521) corresponding to the blocking block (522), and the blocking block (522) is used to block the air passage (521).

9. An energy-saving injection molding device for producing a plastic shell of an eye protector according to claim 8, characterized in that: The exhaust port (512) is located at an upper portion adjacent to the exhaust cavity (511), and the air passage (521) is located at an upper portion adjacent to the exhaust port (512).

10. An energy-saving injection molding device for producing a plastic shell of an eye protector according to claim 4, characterized in that: The blocking component also includes a magnetic attraction component, which is arranged in the convex module (231), and includes a symmetrically distributed first magnetic attraction block (63) and a symmetrically distributed second magnetic attraction block (64), wherein the symmetrically distributed first magnetic attraction blocks (63) are respectively fixed to two sides of the baffle (62), and the symmetry axis of the symmetrically distributed first magnetic attraction blocks (63) is parallel to the moving path of the baffle (62), and the symmetrically distributed second magnetic attraction blocks (64) are both fixed in the convex module (231), and the first magnetic attraction blocks (63) and the adjacent second magnetic attraction blocks (64) are magnetically attracted to each other.

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