Device and method for injection molding of shielding cover

Abstract

The invention relates to the technical field of injection molding equipment, and particularly discloses a shielding cover injection molding device and method.The shielding cover injection molding device comprises a rack, a plurality of injection devices containing different materials are arranged on the rack in a sliding mode, and the rack is further provided with a first inner mold, a left mold base and a right mold base, a mold cavity is formed in the two; the first inner mold comprises a mounting pipe, an elastic sleeve and a plurality of supporting plates, the supporting plates are arranged in an annular array relative to the mounting pipe, the supporting plates move in the radial direction of the mounting pipe through a driving assembly, and the supporting plates are sleeved with the elastic sleeve; a plurality of injection holes are formed in the injection seat, one end of each injection hole is matched with the corresponding injection device, the other end of each injection hole is communicated with a part between the first inner mold and the mold cavity, and the distances between the ends, communicated with the mold cavity, of the injection holes and the axis of the mounting pipe are different; the problems that the research and development difficulty of the shielding cover is large, and the performance parameters of the shielding cover produced at present are relatively low are solved.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding equipment, and in particular to a device and method for injection molding of a shielding cover. Background Art

[0002] During the implementation of the non-stop operation pole operation method, it is often difficult to control the safe distance between the operator on the pole and the static contact of the isolating switch. When the safe distance between the human body and the static contact of the isolating switch is less than 0.4m, the charged body may break through the air gap and discharge to the human body, forming a loop between the human body and the earth, causing a single-phase grounding accident, which puts the operator on the pole in danger of life. In order to avoid harm to the operator during live operation, an insulating shield is usually set on the isolating switch to isolate the charged body, ensure the safe distance between the operator on the pole and the charged body, and avoid the risk of electric shock.

[0003] The performance that the shielding hood needs to have needs to be considered at the beginning of its design. At least it needs to have UV / weather resistance, maintain a certain shape, and high insulation properties. During research and development, the combination materials of injection molding production need to be proportioned and verified. Currently, most shielding hoods are injection molded in one step. To have multiple properties, the formula requirements are high, a lot of experiments are needed, and the research and development is difficult. The performance parameters of the shielding hoods currently produced are still relatively low. Summary of the invention

[0004] The object of the present invention is to provide a device and method for injection molding of a shielding cover, which solves the problems that the research and development of the shielding cover is difficult and the performance parameters of the shielding covers currently produced are relatively low.

[0005] The present invention is implemented by the following technical scheme: a device for injection molding of a shielding cover, comprising a frame, on which a plurality of injection devices filled with different materials are slidably arranged, and a first inner mold and a left mold seat and a right mold seat symmetrically arranged about the first inner mold are also arranged on the frame, and the left mold seat and the right mold seat are each controlled to move by a mold clamping cylinder, and when the two are embraced together, a mold cavity is formed inside, and the first inner mold extends into the mold cavity; The first inner mold comprises a mounting tube, an elastic sleeve and a plurality of support plates, one end of the mounting tube is fixedly connected to the frame, a plurality of the support plates are arranged in a circular array about the mounting tube, the plurality of the support plates are moved radially along the mounting tube by a driving assembly, and the elastic sleeve is sleeved on the plurality of the support plates; It also includes an injection seat, which is sleeved on one end of the first inner mold. The injection seat is provided with a plurality of injection holes. One end of the plurality of injection holes is respectively matched with a plurality of injection devices, and the other end of the plurality of injection holes is connected with the part between the first inner mold and the mold cavity. The distances between the ends of the plurality of injection holes connected with the mold cavity and the axis of the mounting tube are all different.

[0006] Further, the driving assembly includes a driving shaft, a bevel gear, a bevel gear, an internal thread sleeve and a first screw, the driving shaft is coaxially rotatably arranged in the mounting tube, and a plurality of bevel gears are spaced apart on the driving shaft; A plurality of internal threaded sleeves are arranged in a circular array on the mounting tube at a position of the bevel gear disk, and the internal threaded sleeves are rotatably arranged on the mounting tube, and one end of the internal threaded sleeves is sleeved with the bevel gear, and the bevel gear is meshed with the bevel gear disk; one end of the first screw is fixedly connected to the support plate, and the other end of the first screw extends into the internal threaded sleeve and cooperates with the thread of the internal threaded sleeve.

[0007] Furthermore, a mounting frame is provided on the frame, a plurality of vertical slide rails are provided in a circular array between the mounting frame and the frame, a plurality of the injection devices are respectively slidably provided on the plurality of the vertical slide rails, and a driving cylinder is provided on the top of the mounting frame; Guide rods are symmetrically arranged on both sides of the vertical slide rail, and the upper and lower ends of the guide rods are respectively connected to the mounting frame and the frame, and the injection device on the vertical slide rail is slidably sleeved on the two corresponding guide rods, and the guide rods are sleeved with a first return spring, and the two ends of the first return spring are respectively in contact with the injection device and the frame; The upper end sliding sleeve of the driving shaft is provided with a driving tube, the driving tube is spline-connected with the driving shaft, the upper end of the driving tube is sealed, a driving plate is provided on the driving tube, and a plurality of the injection devices are located on the rotation path of the driving plate; A sliding seat and a second return spring are slidably arranged in the driving tube, the lower end of the sliding seat is connected to the driving shaft, and the upper and lower ends of the second return spring are respectively abutted against the driving tube and the sliding seat; the upper end of the driving tube is abutted against the telescopic end of the driving cylinder through the second return spring.

[0008] Furthermore, it also includes a reducer and a transmission shaft, wherein the reducer is arranged on the frame, and the output end of the reducer is transmission-connected to the transmission shaft; The transmission shaft is rotatably arranged on the frame, a first threaded section is arranged on the transmission shaft, a first turbine is sleeved on the drive shaft, and the first threaded section is meshed with the first turbine.

[0009] Furthermore, the injection seat is slidably disposed on the mounting tube, the injection seat is slidably matched with the mold cavity, and the injection seat moves into the mold cavity until it abuts against the ends of the plurality of support plates; It also includes a driving ring and a third return spring, wherein the driving ring and the third return spring are both slidably sleeved on the mounting tube, and the upper and lower ends of the third return spring are respectively in contact with the driving ring and the injection seat; The driving ring is provided with a plurality of tapered holes, and the plurality of tapered holes are respectively located on the moving paths of the plurality of injection devices.

[0010] Furthermore, an annular piston cavity is formed between the injection seat and the mounting tube, and the piston cavity is communicated with a portion between the support plate and the mounting tube; A piston head is slidably arranged in the piston cavity, and the piston head is coaxially connected to the driving ring through a piston tube.

[0011] Furthermore, it also includes a cooling plate, the cooling plate is also fixed on the support plate, and the elastic sleeve is located between the cooling plate and the support plate; A heat exchange cavity is provided in the cooling plate, a plurality of grooves are provided in a circular array on the inner wall of the mounting tube, a water inlet pipe is provided in one of the grooves, and a water return pipe is provided in another of the grooves; It also includes a first water distribution ring pipe and a second water distribution ring pipe, the first water distribution ring pipe and the second water distribution ring pipe are arranged in the installation pipe at intervals, the water inlet pipe is connected to the first water distribution ring pipe, and the first water distribution ring pipe is connected to one end of a plurality of the heat exchange chambers through a plurality of first branch pipes; The return pipe is communicated with the second water distribution ring pipe, and the second water distribution ring pipe is communicated with one end of a plurality of heat exchange chambers away from the first branch pipe through a plurality of second branch pipes.

[0012] Furthermore, it also includes a second inner mold, the second inner mold has the same structure as the first inner mold, and the second inner mold is obliquely connected to the first inner mold; The two installation pipes are sealed and connected, the two drive shafts are transmission-connected through a first universal coupling, the two elastic sleeves are sealed and connected, the two water inlet pipes are interconnected, and the two water return pipes are also interconnected; It also includes a sealing seat, the structure of which is the same as that of the injection seat, and the driving ring on the sealing seat is threadedly matched with the mounting pipe of the second inner mold; The mounting tube of the second inner mold extends out of the mold cavity and is connected to the frame.

[0013] Furthermore, it also includes a separator, which is slidably disposed between the first inner mold and the second inner mold and abuts against the first inner mold and the second inner mold; The partition comprises a driving box, two first partitions and two second partitions, the driving box moves along the midline of the angle between the first inner mold and the second inner mold, the two first partitions are respectively arranged on the left mold seat and the right mold seat for horizontal sliding, and the two second partitions are respectively arranged on the left mold seat and the right mold seat for vertical sliding; The driving box is provided with a first slide bar and a second slide bar respectively, and a first slide groove is provided at one end of the two first partitions close to each other, and when the two first partitions are butted against each other, the first slide bar is placed between the two opposite first slide grooves; A second slide groove is provided at one end of the two second partitions that are close to each other. When the two second partitions are butted against each other, the second slide bar is placed between two opposite second slide grooves. A worm is obliquely arranged on the driving box, a second turbine and a third turbine are arranged in the driving box at intervals, and the worm is meshed with the second turbine and the third turbine at the same time; A first driving gear is sleeved on the shaft on which the second turbine is mounted, and a second driving gear is sleeved on the shaft on which the third turbine is mounted. A first sealing strip is vertically slidably provided on the drive box, the first sealing strip abuts against the two first partitions at the same time, a first rack is provided on the first sealing strip, and the first rack meshes with the first driving gear; a second sealing strip is horizontally slidably provided on the drive box, the second sealing strip abuts against the two second partitions at the same time; a second rack is provided on the second sealing strip, and the second rack meshes with the second driving gear; It also includes a second screw, a nut sleeve, an internal spline tube, a rotating shaft and a second universal coupling, wherein the nut sleeve is fixed on the frame, the second screw is threadedly matched with the nut sleeve, one end of the second screw is coaxially connected with the worm; the other end of the second screw passes through the nut sleeve and is sleeved with the internal spline tube, and the second screw is spline-connected with the internal spline tube; The rotating shaft is rotatably arranged on the frame, one end of the rotating shaft is drivingly connected to the inner spline tube through the second universal coupling, a fourth turbine is sleeved on the rotating shaft, a second threaded section is arranged on the transmission shaft, and the second threaded section is meshed with the fourth turbine.

[0014] Furthermore, a shielding cover injection molding method, using a shielding cover injection molding device, includes the following steps: S1, driving the left mold base and the right mold base to respectively embrace the first inner mold and the second inner mold through two mold clamping cylinders; S2, start the driving cylinder to press down the driving pipe and then press down the first group of injection devices through the driving plate to inject into the current mold cavity, then pump cooling water into the water inlet pipe, and reset the driving cylinder after the layer of plastic is cooled and formed; S3, start the reducer to drive the drive shaft to rotate, and the drive shaft drives the drive plate to rotate to the next group of injection devices through the drive tube; At the same time, the driving shaft drives the bevel gear to rotate through the bevel gear plate, and the bevel gear drives the first screw to rotate through the internal thread sleeve, thereby driving the plurality of support plates to move inward, thereby reducing the diameters of the first inner mold and the second inner mold; S4, then repeat steps S2-S3 to injection mold all the remaining layers; S5. Separate the left mold base and the right mold base through two mold clamping cylinders, and then demold.

[0015] The technical solution of the present invention has at least the following advantages and beneficial effects: 1. Several support plates move synchronously, and cooperate with the expansion and contraction of the elastic sleeve to adjust and control the outer diameter of the first inner mold, thereby controlling the distance between the first inner mold and the injection cavity, and can injection mold shielding covers of different thicknesses.

[0016] 2. After the first group of injection devices have completed the injection molding and forming between the first inner mold and the injection cavity, the support plates are controlled to move inward to form a new injection cavity between the first inner mold and the first layer after injection molding. Then, the new cavity is injected by the second group of injection devices. In this way, multiple layers can be injected back and forth. If the properties of the plastic raw materials are consistent, the layered injection molding can be quickly cooled to improve the injection molding effect. At the same time, each layer can use plastic raw materials with different properties, and then according to the needs of the shielding cover, plastics with various properties are layered and injected to form a shielding cover with multiple overlapping layers and various properties. Usually, the outer layer can be made of elastic, soft or wear-resistant materials, and then the plastic material with a certain support capacity can be selected inside to make it complete. The shielding cover after molding can maintain a relatively fixed shape and can also have a certain elasticity when necessary. Materials with high insulation properties can be selected for the inner part. In view of the invention being used to prevent discharge from causing harm to the human body during live working, the innermost layer can be made of materials that protect the high insulation layer and have certain wear-resistant properties. Then, a multi-layer shielding cover with different properties can be injection molded according to actual needs. There is no need to develop and blend a product that is injection molded once, which greatly reduces the research and development cost and time. The injection molding method provided by the invention can also adjust the performance parameters of different layers according to actual needs. The actual use value is higher and more reliable. The multi-layer combination shielding cover has a variety of performance parameters, which improves the overall performance level.

[0017] 3. The reducer controls the forward and reverse rotation of the drive shaft by driving the first turbine to rotate, and then adjusts the outer diameter of the first inner mold and the position of the drive plate. After injection molding to different layers, the injection device driven by the drive cylinder is also different, and no manual or additional electronic control system is required to adjust, which greatly simplifies the equipment structure.

[0018] 4. When the driving cylinder drives one of the injection devices to move downward for injection, its reciprocating movement can be controlled. Under the action of the third return spring, the piston head is driven to reciprocate. At this time, the air pressure in the cavity between the mounting tube and the plurality of support plates can be controlled. Since there is a gap for injection molding between the first inner mold and the inner wall of the mold cavity or the upper layer after injection molding, the elastic sleeve can be completely separated from the inner wall of the upper layer by controlling the reciprocating movement of the piston head, and it is also ensured that there is no collapse of the first inner mold. At the same time, when injection molding is to be performed, the piston head is pressed down for the last time and the injection seat is abutted against the end of the first inner mold, so that the inside of the first inner mold, that is, the part inside the elastic sleeve, has a certain pressure. Then, during the injection molding and pressure maintaining, as long as the air pressure on both sides of the elastic sleeve is consistent, the elastic sleeve will not or is not easy to deform, thereby ensuring the stability of the first inner mold support and ensuring that the inner cavity is relatively flat after each layer of injection molding is completed.

[0019] 5. The transmission shaft is driven to rotate by the reducer, thereby driving the fourth turbine to rotate. The fourth turbine drives the inner spline tube to rotate through the rotating shaft and the second universal coupling. The inner spline tube rotates synchronously with the second screw and the worm. During the rotation of the second screw, the second screw cooperates with the nut sleeve to move linearly on the frame, thereby driving the drive box to move tiltedly. Here, the setting direction of the second screw is consistent with the travel direction of the drive box. The second screw is spline-connected with the inner spline tube to ensure that the second screw can move linearly while ensuring the transmission connection between the two. The second screw also drives the worm to rotate when rotating, thereby controlling the movement of the first sealing strip and the second sealing strip to seal the gap between the drive box and the first partition and the second partition; the injection-molded shielding cover contains a gap connected to its inner cavity, which is convenient for the installation and removal of the shielding cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A schematic diagram of the internal structure of a device for injection molding a shielding cover provided by the present invention; Figure 2 for Figure 1 A magnified schematic diagram of the structure at center A; Figure 3 for Figure 1 A magnified schematic diagram of the structure at B in the middle; Figure 4 for Figure 1 A magnified schematic diagram of the structure at C in the middle; Figure 5 for Figure 1 A magnified schematic diagram of the structure at D in the middle; Figure 6 A schematic diagram of the top view of the structure of the left mold base and the right mold base of the shielding cover injection molding device provided by the present invention; Figure 7 A schematic diagram of the top view of the structure of the driving plate and injection device of a shielding cover injection molding device provided by the present invention;. Figure 8 A schematic diagram of a top view of a section of a first inner mold located at a driving assembly in a device for injection molding a shield provided by the present invention; Fig. 9 A schematic diagram of the top view of the structure of a first inner mold located at a section of a water inlet pipe in a device for injection molding a shield provided by the present invention; Fig.10 A schematic diagram of the top view of the structure of a section of a first inner mold located at a water return pipe in a device for injection molding of a shielding cover provided by the present invention; Icons: 1. Frame, 11. Left mold base, 12. Right mold base, 13. Clamping cylinder, 14. Mold cavity, 15. Mounting frame, 151. Vertical slide rail, 152. Guide rod, 153. First return spring, 2. Injection device, 3. First inner mold, 31. Mounting tube, 311. Groove, 32. Elastic sleeve, 33. Support plate, 34. Drive assembly, 341. Drive shaft, 342. Bevel gear, 343. Bevel gear, 344, internal thread sleeve, 345, first screw, 35, cooling plate, 351, heat exchange chamber, 36, water inlet pipe, 361, first water distribution ring pipe, 362, first branch pipe, 37, return pipe, 371, second water distribution ring pipe, 372, second branch pipe, 4, second inner mold, 41, first universal coupling, 42, sealing seat, 5, injection seat, 51, injection hole, 52, drive ring, 521, tapered hole, 53, third return spring , 54, piston chamber, 55, piston head, 56, piston tube, 6, driving cylinder, 61, driving tube, 62, driving plate, 63, slide seat, 64, second return spring, 7, reducer, 71, transmission shaft, 72, first threaded section, 73, first turbine, 74, second threaded section, 8, partition, 81, driving box, 811, first slide bar, 812, second slide bar, 82, first partition, 821, first slide groove, 83 , second partition, 831, second slide groove, 84, worm gear, 841, second turbine, 842, third turbine, 843, first drive gear, 844, second drive gear, 845, first sealing strip, 846, first rack, 847, second sealing strip, 848, second rack, 85, second screw, 86, nut sleeve, 87, internal spline tube, 88, rotating shaft, 89, second universal coupling, 810, fourth turbine. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Embodiment 1: Reference Figures 1 to 10 As shown, this embodiment provides a device for injection molding of a shielding cover, which is mainly optimized and improved for the performance parameters of this type of shielding cover, including a frame 1, on which a plurality of injection devices 2 filled with different materials are slidably arranged, and the injection devices 2 are basically the same as traditional injection molding machines, and mainly include: Screw / plunger: responsible for conveying, compressing, melting and mixing plastics. The screw structure is widely used due to its uniform plasticization; Barrel: The metal cylinder that surrounds the screw and contains a heating element to melt the plastic; Heating and cooling system: Temperature control is achieved through resistance heating coils or oil heating, and the cooling system prevents overheating; Nozzle: The channel connecting the barrel and the mold, controlling the flow direction and pressure of the molten plastic; ‌Hydraulic / electric drive unit‌: provides the power required for injection. The hydraulic system generates high pressure through the cylinder, while the electric system relies on a servo motor‌; Injection cylinder: drives the screw or plunger to perform high-speed, high-pressure injection; The remaining structures are conventional settings in this field and will not be described in detail.

[0025] More specifically, Figure 1 and Figure 6As shown, the frame 1 is also provided with a first inner mold 3 and a left mold base 11 and a right mold base 12 which are symmetrically arranged about the first inner mold 3. Both the left mold base 11 and the right mold base 12 have concave cavities. The left mold base 11 and the right mold base 12 are respectively controlled to move by a clamping cylinder 13. Of course, for the movement of the left mold base 11 and the right mold base 12, a right guide rod 152 is also provided. The two clamping cylinders 13 serve as the main power source. When the two are embraced together, a mold cavity 14 is formed inside. The first inner mold 3 extends into the mold cavity 14, and the first inner mold 3 and the mold cavity 14 are gap-matched to form an injection cavity. At the same time, the left mold base 11 and the right mold base 12 are connected with circulating cooling water to cool the two separately so that the shielding cover after injection molding can be quickly cooled and formed. Of course, other cooling equipment can also be used to cool the two separately.

[0026] like Figure 1 and Figure 8-Figure 10 As shown, the first inner mold 3 includes a mounting tube 31, an elastic sleeve 32 and a plurality of support plates 33. One end of the mounting tube 31 is fixedly connected to the frame 1. The plurality of support plates 33 are arranged in a ring array about the mounting tube 31. The plurality of support plates 33 are radially moved along the mounting tube 31 by a driving assembly 34. The elastic sleeve 32 is sleeved on the plurality of support plates 33. The elastic sleeve 32 has greater elasticity and high temperature resistance, such as silicon-based composite aerogel.

[0027] In specific implementation, the driving assembly 34 includes a driving shaft 341, a bevel gear 342, a bevel gear 343, an internal threaded sleeve 344 and a first screw 345. The driving shaft 341 is coaxially rotatably arranged in the mounting tube 31, and a plurality of bevel gears 342 are sleeved at intervals on the driving shaft 341; therefore, when the driving shaft 341 rotates, multiple bevel gears 342 are synchronously driven to rotate, and a plurality of internal threaded sleeves 344 are arranged in a ring array at a position of a bevel gear 342 on the mounting tube 31, and the internal threaded sleeve 344 is rotatably arranged on the mounting tube 31, and a bevel gear 343 is sleeved on one end of the internal threaded sleeve 344, and the bevel gear 343 is meshed with the bevel gear 342; one end of the first screw 345 is fixedly connected to the support plate 33, and the other end of the first screw 345 extends into the internal threaded sleeve 344 and is threadably matched with the internal threaded sleeve 344.

[0028] When each bevel gear disk 342 rotates, it synchronously drives several bevel gears 343 to rotate, and then the bevel gears 343 drive the internal threaded sleeve 344 to rotate. When the internal threaded sleeve 344 rotates, it cooperates with the first screw rod 345 that cannot rotate, and drives the first screw rod 345 to make linear motion. Several first screw rods 345 on the same support plate 33 cooperate to realize the translation of the support plate 33. Several support plates 33 move synchronously, and cooperate with the expansion and contraction of the elastic sleeve 32 to realize the adjustment and control of the outer diameter of the first inner mold 3, thereby controlling the distance between the first inner mold 3 and the injection cavity, and can injection mold shielding covers of different thicknesses.

[0029] More specifically, Figure 1 and Figure 2 As shown, it also includes an injection seat 5, which is sleeved on one end of the first inner mold 3. The injection seat 5 is provided with a plurality of injection holes 51, one end of the plurality of injection holes 51 cooperates with a plurality of injection devices 2 respectively, and the other end of the plurality of injection holes 51 is connected with the part between the first inner mold 3 and the mold cavity 14, and the distances between the ends of the plurality of injection holes 51 connected with the mold cavity 14 and the axis of the mounting tube 31 are all different. Then, when the first inner mold 3 and the injection cavity are injection-molded and formed by the first group of injection devices 2, the plurality of support plates 33 are controlled to move inwardly so that a new injection cavity is formed between the first inner mold 3 and the first layer after injection molding, and then the new cavity is injection-molded by the second group of injection devices 2. In this way, multiple layers can be injection-molded reciprocatingly. If the properties of the plastic raw materials are consistent, the layered injection molding can be quickly cooled to improve the injection molding effect. At the same time, each layer can use plastic raw materials with different properties, and then the plastics with various properties can be layered according to the needs of the shielding cover. Injection molding forms a shielding cover with multiple overlapping layers and multiple properties. Usually, the outer layer can be made of elastic, soft or wear-resistant materials, and then a plastic material with a certain supporting capacity can be selected inside to enable the molded shielding cover to maintain a relatively fixed shape. It can also have a certain elastic capacity when necessary, and a material with high insulation performance can be selected inside. In view of the use of the present invention to prevent discharge from causing harm to the human body during live working, the innermost layer can be made of a material that protects the high insulation layer and has a certain wear-resistant property. Then, according to actual needs, a shielding cover with multiple layers and different properties can be injection molded. There is no need to develop and blend a product that is injection molded once, which greatly reduces the research and development cost and time. The injection molding method provided by the present invention can also adjust the performance parameters of different layers according to actual needs, and the actual use value is higher and more reliable. The shielding cover with multiple layers has multiple performance parameters, thereby improving the overall performance level.

[0030] A mounting frame 15 is provided on the frame 1, and a plurality of vertical slide rails 151 are provided in a circular array between the mounting frame 15 and the frame 1. A plurality of injection devices 2 are slidably provided on the plurality of vertical slide rails 151, and a driving cylinder 6 is provided on the top of the mounting frame 15. The driving cylinder 6 is mainly used to drive the injection device 2 to slide on the vertical slide rail 151; more specifically, guide rods 152 are symmetrically provided on both sides of the vertical slide rail 151, and the upper and lower ends of the guide rods 152 are respectively connected to the mounting frame 15 and the frame 1, and the injection device 2 on the vertical slide rail 151 is slidably sleeved on the two corresponding guide rods 152, and the guide rods 152 are sleeved with a first reset Spring 153, the two ends of the first return spring 153 are respectively in contact with the injection device 2 and the frame 1, and then in the initial state, a group of injection devices 2 are driven to a high position by the two first return springs 153, and then driven in cooperation with the driving cylinder 6; as another embodiment, the first return spring 153 can also adopt other elastic structures or devices, which do not need to drive the injection device 2 to reset and move to a certain height, and can make the nozzle of the injection device 2 leave the injection hole 51 and not act on the driving ring 52, thereby not affecting the air entering the mold cavity 14 when the left mold base 11 and the right mold base 12 are demolded, so as to facilitate the demolding of both.

[0031] When implementing it, Figure 1 and Figure 7 As shown, the upper end sliding sleeve of the driving shaft 341 is provided with a driving tube 61, and the driving tube 61 is spline-connected with the driving shaft 341, so that the driving tube 61 can rotate synchronously with the driving shaft 341. The upper end of the driving tube 61 is sealed, and a driving plate 62 is provided on the driving tube 61. Several injection devices 2 are located on the rotation path of the driving plate 62.

[0032] At the same time, a slide 63 and a second return spring 64 are slidably arranged in the driving tube 61, the lower end of the slide 63 is connected to the driving shaft 341, and the upper and lower ends of the second return spring 64 are respectively abutted against the driving tube 61 and the slide 63; the upper end of the driving tube 61 is abutted against the telescopic end of the driving cylinder 6 by the second return spring 64, and then in the initial state, the driving tube 61 is moved to a high place by the second return spring 64, and then the driving plate 62 is located at the upper end of several injection devices 2, and while the driving tube 61 is rotated, the orientation of the driving plate 62 is adjusted, thereby realizing the driving of different injection devices 2.

[0033] like Figure 1As shown, it also includes a reducer 7 and a transmission shaft 71. The reducer 7 is arranged on the frame 1, and the output end of the reducer 7 is connected to the transmission shaft 71 through a coupling; the transmission shaft 71 is rotatably arranged on the frame 1, and a first threaded section 72 is arranged on the transmission shaft 71. A first turbine 73 is sleeved on the drive shaft 341, and the first threaded section 72 is engaged with the first turbine 73. Then, the reducer 7 controls the forward and reverse rotation of the drive shaft 341 by driving the first turbine 73 to rotate, and then when adjusting the outer diameter of the first inner mold 3, the orientation of the drive plate 62 is adjusted. After injection molding to different layers, the injection device 2 driven by the drive cylinder 6 is also different, and there is no need for manual or additional adjustment through the electronic control system, which greatly simplifies the equipment structure.

[0034] More specifically, the injection seat 5 is slidably disposed on the mounting tube 31, and the injection seat 5 is slidably matched with the mold cavity 14. The injection seat 5 moves into the mold cavity 14 until it abuts against the ends of several support plates 33; the end of the injection seat 5 close to the first inner mold 3 can be provided with a rubber pad to enhance the air tightness when it abuts against several support plates 33 and the elastic sleeve 32 at the same time, so as to prevent the injection plastic from entering between the support plate 33 and the mounting tube 31.

[0035] It also includes a driving ring 52 and a third return spring 53, both of which are slidably sleeved on the mounting tube 31, and the upper and lower ends of the third return spring 53 are respectively in contact with the driving ring 52 and the injection seat 5; a plurality of tapered holes 521 are provided on the driving ring 52, and the plurality of tapered holes 521 are respectively located on the moving paths of the plurality of injection devices 2. When the driving cylinder 6 drives a group of injection devices 2 to move downward for injection molding, the thinner part of the lower end of the nozzle will first pass through the tapered hole 521, and then after the nozzle completely enters the tapered hole 521, the driving ring 52 is driven to move downward, thereby compressing the third return spring 53, and then pushing the injection seat 5 to move downward, and finally the nozzle is docked with the corresponding injection hole 51, so that the injection seat 5 is in contact with the end of the first inner mold 3, and the injection seat 5 is sealed with the left mold seat 11 and the right mold seat 12.

[0036] like Figure 2As shown, an annular piston cavity 54 is formed between the injection seat 5 and the mounting tube 31, and the piston cavity 54 is connected to the cavity portion between the plurality of support plates 33 and the mounting tube 31; a piston head 55 is slidably arranged in the piston cavity 54, and the piston head 55 is coaxially connected to the drive ring 52 through a piston tube 56. In specific implementation, when the driving cylinder 6 drives one group of injection devices 2 to move downward for injection, its reciprocating movement can be controlled. Under the action of the third return spring 53, the piston head 55 is driven to reciprocate. At this time, the air pressure in the cavity between the mounting tube 31 and the plurality of support plates 33 can be controlled. Since there is a gap for injection molding between the first inner mold 3 and the inner wall of the mold cavity 14 or the upper layer after injection molding, the reciprocating movement of the piston head 55 is controlled so that the elastic sleeve 32 can be completely separated from the inner wall of the upper layer, and it is also ensured that the first inner mold 3 will not have any collapsed areas. At the same time, when injection molding is to be performed, the piston head 55 is pressed down for the last time and the injection seat 5 is abutted against the end of the first inner mold 3, so that the interior of the first inner mold 3, that is, the part inside the elastic sleeve 32, has a certain pressure. Then, during the injection molding and pressure maintaining, as long as the air pressure on both sides of the elastic sleeve 32 is consistent, the elastic sleeve 32 will not or is not easy to deform, thereby ensuring the stability of the support of the first inner mold 3 and ensuring that the inner cavity is relatively flat after each layer of injection molding is completed.

[0037] More specifically, Fig. 9 As shown, it also includes a cooling plate 35, and a cooling plate 35 is also fixed on the support plate 33, and the elastic sleeve 32 is located between the cooling plate 35 and the support plate 33; a heat exchange cavity 351 is arranged in the cooling plate 35, and a plurality of grooves 311 are provided in a circular array on the inner wall of the mounting tube 31, a water inlet pipe 36 is arranged in one groove 311, and a water return pipe 37 is arranged in another groove 311; it also includes a first water distribution ring pipe 361 and a second water distribution ring pipe 371, the first water distribution ring pipe 361 and the second water distribution ring pipe 371 are arranged in the mounting tube 31 at intervals, the water inlet pipe 36 is connected to the first water distribution ring pipe 361, and the first water distribution ring pipe 361 is connected to one end of the plurality of heat exchange cavities 351 through a plurality of first branch pipes 362.

[0038] like Fig.10 As shown, the return pipe 37 is connected to the second water distribution ring pipe 371, and the second water distribution ring pipe 371 is connected to one end of a plurality of heat exchange chambers 351 away from the first branch pipe 362 through a plurality of second branch pipes 372.

[0039] After the injection molding of the current layer is completed, while waiting for the plastic to cool down, cooling water is pumped into the water inlet pipe 36 through a water pump. The cooling water enters from one end of the heat exchange chamber 351 and is discharged from the other end of the heat exchange chamber 351. It is recovered through the return pipe 37 to achieve cooling of the inside of the injection molded part. During layered injection molding, each layer can be cooled separately. In conjunction with the cooling equipment on the left mold base 11 and the right mold base 12, the injection molded part can be quickly cooled and formed.

[0040] Embodiment 2: Based on the first embodiment, Figure 1-Figure 10 As shown, it also includes a second inner mold 4, which has the same structure as the first inner mold 3, and is obliquely connected to the first inner mold 3; thus, special-shaped injection molded parts can be injection-molded in layers.

[0041] The two mounting tubes 31 are sealed and connected, the two drive shafts 341 are connected through the first universal coupling 41, the two elastic sleeves 32 are sealed and connected, the two water inlet pipes 36 are interconnected, and the two water return pipes 37 are also interconnected; thus, the second inner mold 4 is interconnected with the first inner mold 3, and the overall control and operation mode are basically the same, so that special-shaped injection molded parts can be injection molded in layers.

[0042] It also includes a sealing seat 42, the structure of which is the same as that of the injection seat 5. The injection holes 51 on the sealing seat 42 are connected to the mold cavity 14 one by one as the diameter of the second inner mold 4 gradually decreases and the injection is gradually injected into the inner layer, so as to facilitate the discharge of air during injection molding; the driving ring 52 on the sealing seat 42 is threadedly matched with the mounting tube 31 of the second inner mold 4, and the driving ring 52 can be rotated to make the sealing seat 42 abut against the end of the second inner mold 4. Since the sealing seat 42 also has a third reset spring 53, it will not affect the reduction of the diameter of the second inner mold 4 and the subsequent reset and enlargement. At the same time, the mounting tube 31 of the second inner mold 4 extends out of the mold cavity 14 and is connected to the frame 1, so that the entire first inner mold 3 and the second outer mold are stably connected to the frame 1, and a fixed gap is maintained with the injection cavity to ensure stable injection molding.

[0043] Embodiment three: Based on the first and second embodiments, Figure 1-Figure 10 As shown, this embodiment provides a device for injection molding of a shielding cover, mainly for the injection molding production of a shielding cover in an integrated shielding cover of an isolating switch and a drainage line with a non-stop operating lever operation method, with invention number: CN2023228558691. The usage of the shielding cover will not be described in detail. The present invention mainly optimizes and improves the performance parameters of this type of shielding cover.

[0044] It also includes a separator 8, which is slidably arranged between the first inner mold 3 and the second inner mold 4, and abuts against the first inner mold 3 and the second inner mold 4; thus, the shielding cover after injection molding contains a gap connected to its inner cavity, which is convenient for installation and removal of the shielding cover.

[0045] like Figure 1 , Figure 3 and Figure 4As shown, the partition 8 includes a driving box 81, two first partitions 82 and two second partitions 83. The driving box 81 moves along the midline of the angle between the first inner mold 3 and the second inner mold 4, which is usually 45°. The two first partitions 82 are respectively arranged on the left mold seat 11 and the right mold seat 12 for horizontal sliding, and the two second partitions 83 are respectively arranged on the left mold seat 11 and the right mold seat 12 for vertical sliding; furthermore, when the first inner mold 3 and the second inner mold 4 shrink, the first partition 82 and the second partition 83 can move synchronously and always abut against the two. After the layered injection molding is completed, each layer has a gap, and the position of the gap is consistent.

[0046] The driving box 81 is respectively provided with a first slide bar 811 and a second slide bar 812; the ends of the two first partitions 82 close to each other are provided with a first slide groove 821, and when the two first partitions 82 are connected to each other, the first slide bar 811 is placed between the two opposite first slide grooves 821; the ends of the two second partitions 83 close to each other are provided with a second slide groove 831, and when the two second partitions 83 are connected to each other, the second slide bar 812 is placed between the two opposite second slide grooves 831; due to the contraction of the first inner mold 3 and the second inner mold 4, the two first partitions 82 move horizontally and the two second partitions 83 move vertically, and both of them are away from the driving box 81, and thus it is necessary to block the gap between the driving box 81 and the two.

[0047] like Figure 1 , Figure 3 and Figure 4 As shown, more specifically, a worm 84 is obliquely arranged on the drive box 81, and a second turbine 841 and a third turbine 842 are arranged in the drive box 81 at intervals. The worm 84 is meshed with the second turbine 841 and the third turbine 842 at the same time; a first driving gear 843 is sleeved on the shaft on which the second turbine 841 is installed, and a second driving gear 844 is sleeved on the shaft on which the third turbine 842 is installed. A first sealing strip 845 is vertically slidably arranged on the drive box 81, and the first sealing strip 845 is simultaneously meshed with the two first spacers. The ends of the plates 82 are abutted, and a first gear rail 846 is provided on the first sealing strip 845, and the first gear rail 846 is meshed with the first driving gear 843; a second sealing strip 847 is horizontally slidably provided on the driving box 81, and the second sealing strip 847 abuts against the two second partitions 83 at the same time; a second gear rail 848 is provided on the second sealing strip 847, and the second gear rail 848 is meshed with the second driving gear 844; thereby blocking the gaps between the driving box 81 and the two first partitions 82 and the two second partitions 83.

[0048] More specifically, it also includes a second screw 85, a nut sleeve 86, an internal spline tube 87, a rotating shaft 88 and a second universal coupling 89. The nut sleeve 86 is fixed on the frame 1, the second screw 85 is threadedly matched with the nut sleeve 86, and one end of the second screw 85 is coaxially connected with the worm 84; the other end of the second screw 85 passes through the nut sleeve 86 and is sleeved with an internal spline tube 87, and the second screw 85 is spline-connected with the internal spline tube 87; the rotating shaft 88 is rotatably set on the frame 1, one end of the rotating shaft 88 is transmission-connected with the internal spline tube 87 through the second universal coupling 89, a fourth turbine 810 is sleeved on the rotating shaft 88, and a second threaded segment 74 is provided on the transmission shaft 71, and the second threaded segment 74 is meshed with the fourth turbine 810.

[0049] During specific implementation, the transmission shaft 71 is driven to rotate through the reducer 7, thereby driving the fourth turbine 810 to rotate. The fourth turbine 810 drives the inner spline tube 87 to rotate through the rotating shaft 88 and the second universal coupling 89. The inner spline tube 87 rotates synchronously with the second screw 85 and the worm 84. During the rotation of the second screw 85, the second screw 85 cooperates with the nut sleeve 86 to make a linear movement on the frame 1, thereby driving the drive box 81 to tilt and move. Here, the setting direction of the second screw 85 is consistent with the travel direction of the drive box 81. The second screw 85 is spline-connected with the inner spline tube 87 to ensure that the two are connected in transmission. At the same time, the second screw 85 can make a linear motion. When the second screw 85 rotates, it also drives the worm 84 to rotate, thereby controlling the movement of the first sealing strip 845 and the second sealing strip 847 to seal the gap between the drive box 81 and the first partition plate 82 and the second partition plate 83; of course, the motor and reducer can also be set separately to drive the rotating shaft 88 to rotate.

[0050] like Figure 1-Figure 10 As shown, a shielding cover injection molding method, using a shielding cover injection molding device, includes the following steps: S1. Drive the left mold base 11 and the right mold base 12 to respectively embrace the first inner mold 3 and the second inner mold 4 through two mold clamping cylinders 13; and also need to embrace the injection seat 5 and the sealing seat 42.

[0051] S2, start the driving cylinder 6 to press down the driving tube 61 and then press down the first group of injection devices 2 through the driving plate 62 to inject the current mold cavity 14, then pump cooling water into the water inlet pipe 36, and after the layer of plastic is cooled and formed, reset the driving cylinder 6; S3, start the reducer 7 to drive the driving shaft 341 to rotate, and the driving shaft 341 drives the driving plate 62 to rotate to the next group of injection devices 2 through the driving tube 61; At the same time, the driving shaft 341 drives the bevel gear 343 to rotate through the bevel gear plate 342, and the bevel gear 343 drives the first screw 345 to rotate through the internal thread sleeve 344, thereby driving the plurality of support plates 33 to move inward, thereby reducing the diameters of the first inner mold 3 and the second inner mold 4; At the same time, the driving box 81 is driven to move obliquely, so that the partition 8 abuts against the first inner mold 3 and the second inner mold 4 .

[0052] S4, then repeat steps S2-S3 to injection mold all the remaining layers; S5. The left mold base 11 and the right mold base 12 are separated by two mold clamping cylinders 13, and then demolding is performed. As the left mold base 11 and the right mold base 12 are separated, the two first partitions 82 and the second partitions 83 embedded in the gap of the shielding cover also move to both sides, thereby stretching the shielding cover at the gap. When the maximum bearing limit is reached, the shielding cover automatically separates and pops out from the two first partitions 82 and the second partitions 83, and falls out under the action of gravity. If some parts have large friction and are not separated automatically, demolding can also be performed manually or with additionally designed demolding parts.

[0053] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for injection molding of a shielding cover, characterized in that: The invention comprises a frame (1), on which a plurality of injection devices (2) containing different materials are slidably arranged, and on which a first inner mold (3) and a left mold base (11) and a right mold base (12) which are symmetrically arranged with respect to the first inner mold (3) are also arranged, wherein the left mold base (11) and the right mold base (12) are respectively controlled to move by a mold clamping cylinder (13), and when the two are clamped together, a mold cavity (14) is formed inside, and the first inner mold (3) extends into the mold cavity (14); The first inner mold (3) comprises a mounting tube (31), an elastic sleeve (32) and a plurality of support plates (33); one end of the mounting tube (31) is fixedly connected to the frame (1); the plurality of support plates (33) are arranged in a ring array with respect to the mounting tube (31); the plurality of support plates (33) are moved radially along the mounting tube (31) by a driving assembly (34); and the elastic sleeve (32) is sleeved on the plurality of support plates (33); It also includes an injection seat (5), the injection seat (5) is sleeved on one end of the first inner mold (3), and a plurality of injection holes (51) are provided on the injection seat (5), one end of the plurality of injection holes (51) respectively cooperates with the plurality of injection devices (2), the other end of the plurality of injection holes (51) is connected to the portion between the first inner mold (3) and the mold cavity (14), and the distances between the ends of the plurality of injection holes (51) connected to the mold cavity (14) and the axis of the mounting tube (31) are all different.

2. The device for injection molding of a shielding cover according to claim 1, characterized in that: The driving assembly (34) comprises a driving shaft (341), a bevel gear (342), a bevel gear (343), an internal thread sleeve (344) and a first screw (345); the driving shaft (341) is coaxially rotatably arranged in the mounting tube (31); and a plurality of bevel gears (342) are spaced apart on the driving shaft (341); A plurality of internal thread sleeves (344) are provided in a ring array at a location on the mounting tube (31) where the bevel gear disk (342) is located. The internal thread sleeve (344) is rotatably mounted on the mounting tube (31). One end of the internal thread sleeve (344) is sleeved with the bevel gear (343), and the bevel gear (343) is meshed with the bevel gear disk (342). One end of the first screw rod (345) is fixedly connected to the support plate (33), and the other end of the first screw rod (345) extends into the internal thread sleeve (344) and is threadably matched with the internal thread sleeve (344).

3. The device for injection molding of a shielding cover according to claim 2, characterized in that: A mounting frame (15) is arranged on the frame (1), a plurality of vertical slide rails (151) are arranged in a ring array between the mounting frame (15) and the frame (1), a plurality of injection devices (2) are slidably arranged on the plurality of vertical slide rails (151), and a driving cylinder (6) is arranged on the top of the mounting frame (15); Guide rods (152) are symmetrically arranged on both sides of the vertical slide rail (151), and the upper and lower ends of the guide rods (152) are respectively connected to the mounting frame (15) and the frame (1), and the injection device (2) on the vertical slide rail (151) is slidably sleeved on the two corresponding guide rods (152), and the guide rods (152) are sleeved with a first return spring (153), and the two ends of the first return spring (153) are respectively in contact with the injection device (2) and the frame (1); The upper end sliding sleeve of the driving shaft (341) is provided with a driving tube (61), the driving tube (61) is spline-connected to the driving shaft (341), the upper end of the driving tube (61) is sealed, a driving plate (62) is provided on the driving tube (61), and a plurality of the injection devices (2) are located on a rotation path of the driving plate (62); A slide seat (63) and a second return spring (64) are slidably arranged in the driving tube (61); the lower end of the slide seat (63) is connected to the driving shaft (341); the upper and lower ends of the second return spring (64) are respectively in contact with the driving tube (61) and the slide seat (63); and the upper end of the driving tube (61) is in contact with the telescopic end of the driving cylinder (6) through the second return spring (64).

4. The device for injection molding of a shielding cover according to claim 3, characterized in that: It also comprises a reducer (7) and a transmission shaft (71), wherein the reducer (7) is arranged on the frame (1), and an output end of the reducer (7) is in transmission connection with the transmission shaft (71); The transmission shaft (71) is rotatably arranged on the frame (1), a first threaded section (72) is arranged on the transmission shaft (71), a first turbine (73) is sleeved on the drive shaft (341), and the first threaded section (72) meshes with the first turbine (73).

5. The device for injection molding of a shielding cover according to claim 4, characterized in that: The injection seat (5) is slidably arranged on the mounting tube (31), the injection seat (5) is slidably matched with the mold cavity (14), and the injection seat (5) moves into the mold cavity (14) until it abuts against the ends of the plurality of support plates (33); It also includes a driving ring (52) and a third return spring (53), wherein the driving ring (52) and the third return spring (53) are both slidably mounted on the mounting tube (31), and the upper and lower ends of the third return spring (53) are respectively in contact with the driving ring (52) and the injection seat (5); A plurality of tapered holes (521) are provided on the driving ring (52), and the plurality of tapered holes (521) are respectively located on the moving paths of the plurality of injection devices (2).

6. The device for injection molding of a shielding cover according to claim 5, characterized in that: An annular piston cavity (54) is formed between the injection seat (5) and the mounting tube (31), and the piston cavity (54) is communicated with a portion between the support plate (33) and the mounting tube (31); A piston head (55) is slidably disposed in the piston chamber (54), and the piston head (55) is coaxially connected to the drive ring (52) via a piston tube (56).

7. The device for injection molding of a shielding cover according to claim 6, characterized in that: It also includes a cooling plate (35), the cooling plate (35) being fixedly mounted on the support plate (33), and the elastic sleeve (32) being located between the cooling plate (35) and the support plate (33); A heat exchange cavity (351) is provided in the cooling plate (35), a plurality of grooves (311) are provided in a circular array on the inner wall of the mounting tube (31), a water inlet pipe (36) is provided in one of the grooves (311), and a water return pipe (37) is provided in another of the grooves (311); It also comprises a first water distribution ring pipe (361) and a second water distribution ring pipe (371), wherein the first water distribution ring pipe (361) and the second water distribution ring pipe (371) are arranged in the installation pipe (31) at intervals, the water inlet pipe (36) is connected to the first water distribution ring pipe (361), and the first water distribution ring pipe (361) is connected to one end of a plurality of the heat exchange chambers (351) through a plurality of first branch pipes (362); The return water pipe (37) is in communication with the second water distribution ring pipe (371), and the second water distribution ring pipe (371) is in communication with one end of a plurality of heat exchange chambers (351) away from the first branch pipe (362) through a plurality of second branch pipes (372).

8. The device for injection molding of a shielding cover according to claim 7, characterized in that: It also comprises a second inner mould (4), the second inner mould (4) having the same structure as the first inner mould (3), and the second inner mould (4) being connected to the first inner mould (3) at an angle; The two mounting pipes (31) are sealed and connected, the two drive shafts (341) are transmission-connected via a first universal coupling (41), the two elastic sleeves (32) are sealed and connected, the two water inlet pipes (36) are interconnected, and the two water return pipes (37) are also interconnected; It also comprises a sealing seat (42), the structure of the sealing seat (42) being the same as that of the injection seat (5), the driving ring (52) on the sealing seat (42) being threadedly matched with the mounting tube (31) of the second inner mold (4); The mounting tube (31) of the second inner mold (4) extends out of the mold cavity (14) and is connected to the frame (1).

9. The device for injection molding of a shielding cover according to claim 8, characterized in that: It also comprises a separator (8), wherein the separator (8) is slidably disposed between the first inner mold (3) and the second inner mold (4), and abuts against the first inner mold (3) and the second inner mold (4); The partition (8) comprises a drive box (81), two first partitions (82) and two second partitions (83); the drive box (81) moves along the midline of the angle between the first inner mold (3) and the second inner mold (4); the two first partitions (82) are respectively arranged on the left mold base (11) and the right mold base (12) for horizontal sliding; and the two second partitions (83) are respectively arranged on the left mold base (11) and the right mold base (12) for vertical sliding; The drive box (81) is provided with a first slide bar (811) and a second slide bar (812), respectively; the ends of the two first partitions (82) close to each other are each provided with a first slide groove (821); when the two first partitions (82) are butted against each other, the first slide bar (811) is placed between two opposite first slide grooves (821); A second slide groove (831) is provided at one end of the two second partitions (83) that are close to each other, and when the two second partitions (83) are butted against each other, the second slide bar (812) is placed between two opposite second slide grooves (831); A worm (84) is obliquely arranged on the drive box (81), a second turbine (841) and a third turbine (842) are arranged in the drive box (81) at intervals, and the worm (84) is meshed with the second turbine (841) and the third turbine (842) at the same time; A first driving gear (843) is sleeved on the shaft on which the second turbine (841) is mounted, and a second driving gear (844) is sleeved on the shaft on which the third turbine (842) is mounted. A first sealing strip (845) is vertically slidably disposed on the driving box (81), the first sealing strip (845) abuts against the two first partitions (82) at the same time, a first rack (846) is disposed on the first sealing strip (845), and the first rack (846) meshes with the first driving gear (843); a second sealing strip (847) is horizontally slidably disposed on the driving box (81), the second sealing strip (847) abuts against the two second partitions (83) at the same time; a second rack (848) is disposed on the second sealing strip (847), and the second rack (848) meshes with the second driving gear (844); It also comprises a second screw rod (85), a nut sleeve (86), an internal spline tube (87), a rotating shaft (88) and a second universal coupling (89), wherein the nut sleeve (86) is fixedly mounted on the frame (1), the second screw rod (85) is threadedly matched with the nut sleeve (86), one end of the second screw rod (85) is coaxially connected to the worm (84); the other end of the second screw rod (85) passes through the nut sleeve (86) and is then sleeved with the internal spline tube (87), and the second screw rod (85) is spline-connected to the internal spline tube (87); The rotating shaft (88) is rotatably arranged on the frame (1); one end of the rotating shaft (88) is drivingly connected to the internal spline tube (87) via the second universal coupling (89); a fourth turbine (810) is sleeved on the rotating shaft (88); a second threaded section (74) is arranged on the transmission shaft (71); and the second threaded section (74) is meshed with the fourth turbine (810).

10. A method for injection molding of a shielding cover, using the device for injection molding of a shielding cover as claimed in claim 9, characterized in that: The following steps are involved: S1, using two mold clamping cylinders (13) to respectively drive the left mold base (11) and the right mold base (12) to clamp onto the first inner mold (3) and the second inner mold (4); S2, starting the driving cylinder (6) to press down the driving tube (61) and then press down the first group of injection devices (2) through the driving plate (62), injecting the current mold cavity (14), then pumping cooling water into the water inlet pipe (36), and after the layer of plastic is cooled and formed, resetting the driving cylinder (6); S3, starting the reducer (7) to drive the driving shaft (341) to rotate, and the driving shaft (341) drives the driving plate (62) to rotate to the next group of injection devices (2) through the driving tube (61); At the same time, the driving shaft (341) drives the bevel gear (343) to rotate via the bevel gear plate (342), and the bevel gear (343) drives the first screw (345) to rotate via the internal thread sleeve (344), thereby driving the plurality of support plates (33) to move inward, thereby reducing the diameters of the first inner mold (3) and the second inner mold (4); S4, then repeat steps S2-S3 to injection mold all the remaining layers; S5. The left mold base (11) and the right mold base (12) are separated by two mold clamping cylinders (13), followed by demoulding.

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