Injection molding device and method based on processing of conductive plastic for cable shielding

Abstract

The invention relates to the technical field of injection molding, and particularly discloses an injection molding device based on cable shielding conductive plastic processing, which comprises a machine body, a screw extrusion component configured at the right part of the machine body and used for injecting plastic, a fixed mold configured on the machine body, a movable mold configured at the left side of the fixed mold, a mold core configured at the right part of the movable mold, and a ring sleeve configured at the left part of the fixed mold, the injection molding device is characterized in that the injection molding device further comprises a clamping assembly arranged outside the mold core and used for clamping a mold core injection molding part during demolding, the clamping assembly comprises a circular plate frame, a clamping frame is arranged on the right side of the circular plate frame in a sliding mode, the circular plate frame is provided with a connecting frame and a rotating assembly, and the rotating assembly is arranged on the left portion of the mold core and used for clamping the mold core injection molding part during demolding. Through cooperation of the structure, the pipe fitting and the mold core can rotate, so that rolling friction is generated on the contact face, the friction coefficient is small, the pipe fitting can be separated conveniently, and therefore the machining efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding, in particular to an injection molding device and method based on processing conductive plastics for cable shielding. Background Art

[0002] Conductive plastics are functional polymer materials that are made by mixing resin and conductive substances and processing them using the same processing methods as plastics. They are mainly used in electronics, integrated circuit packaging, electromagnetic wave shielding and other fields.

[0003] Conductive plastics are generally made of polyethylene, polypropylene or polyvinyl chloride, which are non-conductive. To make conductive plastics, it is necessary to add carbon black or graphene materials to polyethylene, polypropylene or polyvinyl chloride so that the produced plastics have a certain conductivity and can be used for cable electromagnetic shielding. Polyethylene is a recyclable material.

[0004] In some special locations, electromagnetic interference is more serious. For example, in areas with dense electronic equipment, cables inside or around computer hosts, server cabinets, routers and other equipment need special attention to electromagnetic shielding. In order to improve the electromagnetic shielding effect in this location, it is necessary to add a sheath made of conductive plastic to the cable for electromagnetic shielding to reduce electromagnetic interference.

[0005] When processing conductive plastic into cable shielding sheath, an injection molding device is required for processing. For example, the "Injection molding machine with a flip-type cooling and demolding mechanism" with the authorization announcement number "CN112172015B" drives the flip support adjustment plate to flip by a lateral drive motor to switch the lower first and second molding molds to cooperate with the upper molding mold, which facilitates gravity demolding at the lower end of the mold and improves the efficiency of injection molding. However, the sheath is usually tubular. During injection molding, the shrinkage rate of polyethylene is as high as 1.5% to 3.5% when cooling. The inner wall of the molded pipe will tightly hold the core, generating a huge holding force, which makes it difficult to demold. Therefore, the above scheme is not suitable for demolding of anti-shielding sheaths. The existing technology also uses direct ejection for demolding. When the traditional ejector pushes the pipe, there is pure sliding friction between the inner wall of the tubular sheath and the stationary core, and the friction coefficient is high, which makes it difficult to demold the tubular sheath, thereby affecting the processing efficiency. Summary of the Invention

[0006] The purpose of the present invention is to provide an injection molding device and method based on the processing of conductive plastics for cable shielding, which can automatically demold the pipe and the core at the same time to generate rolling friction on the contact surface. The friction coefficient is small, which can facilitate the separation of the pipe, thereby improving the processing efficiency and solving the problems raised in the above-mentioned background technology.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: an injection molding device for processing conductive plastic for cable shielding, comprising a body, a screw extrusion assembly for injecting plastic is disposed on the right side of the body, a fixed mold is disposed on the body, a movable mold is disposed on the left side of the fixed mold, a core is disposed on the right side of the movable mold, and a ring is disposed on the left side of the fixed mold, wherein a cooling cavity for cooling is provided inside the ring. The injection molding device is characterized in that it further comprises:

[0008] The clamping assembly is arranged outside the core and is used for clamping the core injection molded part when demoulding. The clamping assembly includes a circular plate frame, a clamping frame is slidably arranged on the right side of the circular plate frame, and the circular plate frame is equipped with a connecting frame;

[0009] The rotating assembly is arranged on the left side of the core, and the rotating assembly includes a straight rod arranged on the left side of the core, a spiral groove is opened on the left side of the straight rod, a guide slider is arranged inside the spiral groove, and a movable fixed frame is arranged outside the straight rod. When the guide slider moves in the spiral groove, the straight rod and the fixed frame generate relative rotation;

[0010] The driving assembly is used to drive the movable mold to move left and right. When the movable mold is driven away from the fixed mold, the connecting frame contacts the left inner side of the machine body, causing the clamping assembly and the movable mold to move relative to each other to demold the injection molded part.

[0011] Preferably, the clamping frame is configured with multiple ones, the right side of the clamping frame passes through the movable mold to configure the clamping plate, the fixed frame is fixed to the guide slider, the fixed frame is fixed to the circular plate frame, the clamping frame slides with the movable mold, and the inner side of the clamping plate is fixedly connected with a rubber anti-slip pad.

[0012] Preferably, the clamping assembly further comprises:

[0013] The annular groove is provided on the right side of the movable mold. The inner side of the annular groove is fixedly connected to the limit frame at the position corresponding to the clamping frame. The right side of the clamping frame is inclined and bent.

[0014] The mounting ring is arranged on the left side of the movable mold. The interior of the mounting ring is fixedly connected to a fixed plate. The interior of the fixed plate is slidably connected to a vertical rod. The bottom of the vertical rod is fixedly connected to a frame. A first spring is fixedly connected between the vertical rod and the fixed plate. The clamping frame passes through the interior of the frame.

[0015] Preferably, a rotating shaft is rotatably connected to the inner side of the frame near the clamping frame and the inner side of the limiting frame near the clamping frame.

[0016] Preferably, the right parts of the front and rear ends of the connecting frame are fixedly connected with long rods, the outer wall of the long rods slides with the movable mold, and the outer part of the long rods is sleeved with a second spring, and the two ends of the second spring are respectively fixed to the movable mold and the connecting frame.

[0017] Preferably, the rotating assembly further comprises:

[0018] The blocking plate is arranged on the outer wall of the straight rod and is located on the left side of the movable mold. The distance between the core and the straight rod is greater than the thickness of the movable mold. The right part of the blocking plate is rotated with a ball for reducing friction.

[0019] Preferably, the interior of the core is configured with an injection assembly, which includes a circular groove opened inside the core, a push rod slidably connected to the interior of the circular groove, a blocking rod that can move inside the core, and the curvature of the end of the blocking rod is adapted to the outer wall of the core. The left part of the circular groove is fixedly connected to the first magnetic block, the left part of the push rod is fixedly connected to the second magnetic block, the outer side of the second magnetic block is tilted, the blocking rod is tilted near the second magnetic block, and the interior of the straight rod is hollow.

[0020] Preferably, the jet assembly further comprises:

[0021] A ventilation cavity is opened inside the core, and the ventilation cavity is connected to the internal hollow of the straight rod. A sealing plate is fixedly connected to the outer wall of the blocking rod. A cavity is opened inside the core outside the sealing plate. The interior of the cavity is inclined, and the interior of the cavity is connected to the ventilation cavity.

[0022] Preferably, the right side of the movable mold is provided with an air source assembly, which includes a bellows fixed between the connecting frame and the movable mold, an exhaust pipe fixedly connected to the left side of the bellows, and the air source assembly also includes a rotary joint installed on the left end of the straight rod, the exhaust pipe is connected to the rotary joint, and an air intake pipe is fixedly connected to the right side of the bellows, and the exhaust pipe is made of soft material.

[0023] The injection molding method for processing conductive plastics for cable shielding comprises the following steps:

[0024] S1, injection, the movable mold and the fixed mold are closed, and the molten raw material is injected through the screw extrusion assembly;

[0025] S2, demoulding, the clamping assembly clamps the molding material and generates relative movement with the core to achieve demoulding.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. Through the cooperation of the clamping assembly and the rotating assembly, the tube and the core can rotate to generate rolling friction on the contact surface during automatic demoulding. The friction coefficient is small, which can facilitate the separation of the tube and thus improve the processing efficiency.

[0028] 2. The role of the jet assembly can further reduce the friction coefficient and further reduce the difficulty of demoulding the pipe fittings, thereby improving the efficiency of demoulding. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the specific embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 It is an overall structural view of the present invention;

[0031] Figure 2 It is a schematic diagram of a half-section structure of the present invention;

[0032] Figure 3 Schematic diagram of the half-section structure of the movable mold of the present invention;

[0033] Figure 4 For the present invention Figure 3 A magnified view of point A;

[0034] Figure 5 For the present invention Figure 3 Enlarged view of point B;

[0035] Figure 6 It is a schematic diagram of the partial structure of the mounting ring of the present invention;

[0036] Figure 7 This is a schematic diagram of the partial structure of the clamping frame of the present invention when it is not limited by the limiting frame;

[0037] Figure 8 This is a schematic diagram of the local structure of the clamping frame of the present invention when it is limited by the limiting frame;

[0038] Figure 9 It is a schematic diagram of the partial structure of the driving assembly of the present invention;

[0039] Figure 10 It is a schematic diagram of a half-section structure of the fixing frame of the present invention;

[0040] Figure 11 It is a side structural schematic diagram of the circular plate frame of the present invention;

[0041] Figure 12 It is a partial side structural schematic diagram of the movable mold of the present invention.

[0042] Description of reference numerals:

[0043] 1. Machine body; 2. Fixed mold; 3. Moving mold; 4. Core; 5. Ring sleeve; 6. Clamping assembly; 61. Circular plate frame; 62. Clamping frame; 63. Clamping plate; 64. Connecting frame; 65. Ring groove; 66. Limiting frame; 67. Mounting ring; 68. Fixed plate; 69. Vertical rod; 610. Frame; 611. First spring; 612. Rubber anti-skid pad; 7. Rotating assembly; 71. Straight rod; 72. Guide slide; 73. Fixed Frame; 74, blocking plate; 8, jet assembly; 81, circular groove; 82, push rod; 83, blocking rod; 84, first magnetic block; 85, second magnetic block; 86, ventilation cavity; 87, sealing plate; 88, cavity; 9, air source assembly; 91, bellows; 92, exhaust pipe; 93, rotary joint; 94, air inlet pipe; 10, drive assembly; 11, long rod; 12, second spring; 13, cooling cavity; 14, screw extrusion assembly. DETAILED DESCRIPTION

[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0045] Example 1: Please refer to Figures 1 to 12 The present invention provides a technical solution: an injection molding device based on the processing of conductive plastic for cable shielding, comprising a body 1, the front part of the body 1 is rotatably connected to a cabinet door, which is convenient for opening the cabinet door and taking out the injection-molded sheath, and the right part of the body 1 is provided with a screw extrusion assembly 14 for injecting plastic. The screw extrusion assembly 14 is a mature existing technology and will not be described in detail. The conductive plastic made of recycled polyethylene is added into the barrel of the screw extrusion assembly 14 from the feed port of the screw extrusion assembly 14. The screw rotation can transport the raw material, and a heating assembly for melting the raw material is provided outside the barrel of the screw extrusion assembly 14. The transmission system of the screw extrusion assembly 14 can realize the screw movement to transport the raw material or inject the melted polyethylene conductive plastic into the mold.

[0046] The machine body 1 is fixed with a fixed mold 2, and the machine body 1 is located on the left side of the fixed mold 2 and a movable mold 3 is slid thereon. A core 4 is arranged on the right side of the movable mold 3, and a ring sleeve 5 is fixed on the left side of the fixed mold 2. A cooling chamber 13 for cooling is provided inside the ring sleeve 5. The injection molding device also includes a clamping assembly 6 arranged on the outside of the core 4, and the clamping assembly 6 is used to clamp the injection-molded part of the core 4 when it is demolded. The clamping assembly 6 includes a circular plate frame 61, and a clamping frame 62 is slid on the right side of the circular plate frame 61, and a connecting frame 64 is fixedly connected to the left side of the circular plate frame 61. The injection molding device also includes a rotating assembly 7 arranged on the left side of the core 4, and the rotating assembly 7 includes a straight rod 71 fixed to the left side of the core 4, and a spiral groove is provided on the left side of the straight rod 71. A guide slider 72 is movable inside the spiral groove, and an external movable fixed frame 73 of the straight rod 71. When the guide slider 72 moves in the spiral groove, relative rotation is generated between the straight rod 71 and the fixed frame 73.

[0047] The injection molding device also includes a driving assembly 10 for driving the movable mold 3 to move left and right. The driving assembly 10 is composed of a motor and a screw. The motor is fixedly connected to the left part of the body 1, and the output shaft of the motor is fixed to the screw. The screw is threadedly connected to the front and rear ends of the movable mold 3. By rotating the output shaft of the motor, the screw can be rotated to drive the movable mold 3 to move left and right. When the movable mold 3 is driven away from the fixed mold 2, the connecting frame 64 contacts the inner left part of the body 1, so that the clamping assembly 6 and the movable mold 3 move relative to each other to demold the injection molded part. The clamping frame 62 is configured with multiple, and the right side of the clamping frame 62 passes through the movable mold 3 to fix the clamping plate 63, the fixing frame 73 is fixed to the guide slider 72, the fixing frame 73 is fixed to the circular plate frame 61, the clamping frame 62 slides with the movable mold 3, and the inner side of the clamping plate 63 is fixedly connected with a rubber anti-slip pad 612 The right parts of the front and rear ends of the connecting frame 64 are fixedly connected with the long rod 11, the outer wall of the long rod 11 slides with the movable mold 3, the outer part of the long rod 11 is provided with a second spring 12, and the two ends of the second spring 12 are respectively fixed to the movable mold 3 and the connecting frame 64, the clamping assembly 6 also includes an annular groove 65 opened on the right part of the movable mold 3, the inner side of the annular groove 65 is fixedly connected to the position of the clamping frame 62 to the limit frame 66, the right part of the clamping frame 62 is inclined and bent, the clamping assembly 6 also includes a mounting ring 67 fixed to the left part of the movable mold 3, the interior of the mounting ring 67 is fixedly connected to the fixing plate 68, the interior of the fixing plate 68 is slidably connected to the vertical rod 69, the bottom of the vertical rod 69 is fixedly connected to the frame 610, the first spring 611 is fixedly connected between the vertical rod 69 and the fixing plate 68, and the clamping frame 62 passes through the inside of the frame 610.

[0048] By adopting the above technical solution, when the cable shielding sheath is produced by injection molding, the driving component 10 drives the movable mold 3 to move in the direction close to the fixed mold 2, so that the fixed mold 2 and the movable mold 3 are closed. At this time, the core 4 is located inside the ring sleeve 5, and the inner diameter of the ring sleeve 5 is larger than the inner part of the core 4. At this time, the melted raw material is extruded by the screw extrusion component 14, so that the melted raw material enters the gap between the core 4 and the ring sleeve 5, and then the coolant for cooling is introduced into the interior of the cooling chamber 13 to realize the melted raw material, so that the cable shielding sheath can be quickly formed.

[0049] When the cable shielding sheath needs to be demoulded after being formed, the driving assembly 10 drives the movable mold 3 to move away from the fixed mold 2. Therefore, when the movable mold 3 brings the core 4 and the anti-shielding pipe fitting that is tightly attached to the core 4 away from the fixed mold 2 and the ring sleeve 5, the anti-shielding pipe fitting can be easily separated from the inner side of the ring sleeve 5 due to the shrinkage of the polyethylene material after cooling. When the movable mold 3 brings the core 4 and the anti-shielding pipe fitting that is tightly attached to the core 4 completely away from the ring sleeve 5 to the left and continues to move a distance to the left, the left part of the connecting frame 64 begins to contact the inner side of the body 1. The movable mold 3 moves to the left side, and then continues to move the movable mold 3 to the left direction. At this time, the connecting frame 64 is limited by the body 1, so that the movable mold 3, the core 4 and the connecting frame 64, the circular plate frame 61, the clamping frame 62 and the clamping plate 63 produce relative movement. At this time, movement occurs between the clamping frame 62 and the limiting frame 66. In this process, under the limiting action of the limiting frame 66, the rotating shaft set on the limiting frame 66 rolls along the right inclined part of the clamping frame 62, causing the clamping frame 62 to produce a displacement close to the anti-shielding pipe.

[0050] When the rotating shaft of the limit frame 66 rolls along the inclined right part of the clamping frame 62 to the flat part of the top of the clamping frame 62, the inner side of the rubber anti-skid pad 612 is in close contact with the pipe fitting. At this time, the driving assembly 10 drives the movable mold 3 to continue to move away from the fixed mold 2, so that the clamping frame 62 and the clamping plate 63 continue to move relative to the core 4. Since the rubber anti-skid pad 612 clamps the pipe fitting at this time, the pipe fitting and the core 4 can move relative to each other, thereby realizing automatic separation of the injection-molded pipe fitting and improving production efficiency.

[0051] When the pipe fitting is detached, due to the relative movement between the circular plate frame 61 and the movable mold 3, relative movement can be generated between the fixed frame 73 and the guide slider 72 installed inside it and the straight rod 71. In this process, since the guide slider 72 moves inside the spiral groove, the straight rod 71 can rotate with the core 4. With this design, when the pipe fitting is detached from the core 4, the core 4 can rotate, and under the action of the clamping assembly 6, the pipe fitting does not rotate. When the pipe fitting is detached, if there is pure sliding friction between the inner wall of the pipe fitting and the core 4, the friction coefficient is relatively high. When the pipe fitting is detached, the pipe fitting and the core 4 rotate to generate rolling friction on the contact surface, and the friction coefficient is relatively small, which can facilitate the detachment of the pipe fitting, thereby improving the processing efficiency.

[0052] It should be noted that the curvature of the inner side of the clamping plate 63 and the rubber anti-slip pad 612 is adapted to the curvature of the outer side of the anti-shielding pipe fitting, and there are multiple clamping frames 62 and clamping plates 63 to improve the clamping effect of the pipe fitting, thereby facilitating the detachment effect of the pipe fitting and improving the demolding efficiency.

[0053] The inner side of the frame 610 near the clamping frame 62 and the limiting frame 66 near the clamping frame 62 are both rotatably connected with a rotating shaft, and the rotating shaft is used to reduce friction during movement.

[0054] By adopting the above technical solution, when the movable mold 3 approaches the fixed mold 2 for mold closing, under the elastic force of the second spring 12, the distance between the circular plate frame 61 and the movable mold 3 returns to the initial state, facilitating the next demoulding operation.

[0055] When the clamping frame 62 moves, it passes through the inside of the frame 610. When the clamping frame 62 moves up and down, the frame 610, the vertical rod 69 and the fixed plate 68 move relative to each other, and the first spring 611 is deformed. When the movable mold 3 approaches the fixed mold 2 for mold closing, the inclined part of the clamping frame 62 gradually returns to the position of the rotation axis of the limit frame 66. At this time, under the action of the elastic force of the first spring 611, the clamping plate 63 returns to a position away from the core 4 to avoid blocking the core 4 from inserting into the inside of the ring sleeve 5.

[0056] The design of the frame 610 can improve the structural stability of the clamping frame 62 when it moves.

[0057] The rotating assembly 7 also includes a blocking plate 74 fixed to the outer wall of the straight rod 71 and located on the left side of the movable mold 3. The distance between the core 4 and the straight rod 71 is greater than the thickness of the movable mold 3. The right part of the blocking plate 74 rotates with a ball for reducing friction, and the straight rod 71 and the movable mold 3 move.

[0058] By adopting the above technical solution, the design of the blocking plate 74 prevents the straight rod 71 from moving with the fixed frame 73. When the mold is closed, under the extrusion cooperation of the movable mold 3 and the fixed mold 2, the left end of the core 4 is close to the right side of the movable mold 3 to ensure the sealing of the molding chamber.

[0059] When demoulding, as the fixed frame 73 moves, a gap is generated between the left end of the core 4 and the movable mold 3, which is beneficial to reducing the friction when the core 4 rotates, facilitating the rotation of the core 4, and thus improving the demoulding efficiency. At this time, the ball contacts the movable mold 3, which can reduce the friction of the movement.

[0060] It should be noted that after the relative movement between the clamping assembly 6 and the core 4 is completed, a small portion of the pipe is still on the core 4. At this time, due to the small contact surface, it is easy to

[0061] Embodiment 2: The technical solution of this embodiment is different from that of embodiment 1 in that: Figures 1 to 6 and Figure 11 The core 4 is internally provided with an injection assembly 8, which includes a circular groove 81 provided inside the core 4, a push rod 82 being slidably connected to the inside of the circular groove 81, a blocking rod 83 being movable inside the core 4, and the end curvature of the blocking rod 83 being adapted to the outer wall of the core 4, a first magnetic block 84 being fixedly connected to the left portion of the circular groove 81, a second magnetic block 85 being fixedly connected to the left portion of the push rod 82, the outer side of the second magnetic block 85 being tilted, the blocking rod 83 being tilted near the second magnetic block 85, the interior of the straight rod 71 being hollow, the injection assembly 8 also includes a ventilation cavity 86 provided inside the core 4, the ventilation cavity 86 being connected to the internal hollow of the straight rod 71, the outer wall of the blocking rod 83 being fixedly connected to a blocking plate 87, and the interior of the core 4 being located at the blocking plate 87 A cavity 88 is provided on the outside, and the interior of the cavity 88 is inclined. The interior of the cavity 88 is connected to the ventilation cavity 86. The right part of the movable mold 3 is provided with an air source component 9, and the air source component 9 includes a corrugated bag 91 fixed between the connecting frame 64 and the movable mold 3. The left part of the corrugated bag 91 is fixedly connected with an exhaust pipe 92. The air source component 9 also includes a rotary joint 93 installed on the left end of the straight rod 71. The principle and installation method of the rotary joint 93 are mature existing technologies and will not be elaborated on. The exhaust pipe 92 is connected to the rotary joint 93, and the right side of the corrugated bag 91 is fixedly connected with an air intake pipe 94. The exhaust pipe 92 is made of soft material, and the first magnetic block 84 is close to the magnetic pole on one side of the second magnetic block 85. The bottom of the blocking rod 83 is made of iron material.

[0062] Check valves are installed inside the air intake pipe 94 and the exhaust pipe 92. The check valve is a mature existing technology and will not be described in detail. The check valve inside the air intake pipe 94 only allows external gas to enter the interior of the bellows 91 through the air intake pipe 94, and the check valve inside the exhaust pipe 92 only allows the gas inside the bellows 91 to enter the interior of the rotary joint 93.

[0063] By adopting the above technical solution, during demoulding, when the connecting frame 64 is limited by the body 1, the connecting frame 64 and the movable mold 3 produce relative movement. At this time, the gas inside the corrugated bag 91 enters the interior of the rotary joint 93, so that the gas enters the interior of the straight rod 71 through the rotary joint 93. The gas follows the vent cavity 86 into the interior of the cavity 88, and is discharged from the gap between the blocking rod 83 and the core 4 at this time, so that the gas enters between the pipe fitting and the core 4. In this way, the air forms an air film between the core 4 and the inner wall of the pipe fitting, and the direct contact solid-solid friction is converted into solid-gas-solid friction. The friction coefficient can be reduced, further reducing the difficulty of demoulding the pipe fitting, thereby improving the efficiency of demoulding.

[0064] When the mold is closed, the bellows 91 stretches and the gas on the outer wall enters the interior of the bellows 91 to prepare for the next demolding.

[0065] When the mold is closed, the push rod 82 is squeezed by the fixed mold 2, so that the push rod 82 completely enters the interior of the circular groove 81, and at this time the right part of the core 4 is tightly attached to the fixed mold 2 to ensure sealing. During this process, the blocking rod 83 is limited by the extrusion of the left part of the outer wall of the push rod 82, and the top of the blocking rod 83 blocks the hole that the core 4 and the blocking rod 83 are adapted to, and the top of the sealing plate 87 is tightly attached to the inner top of the cavity 88 to ensure the sealing performance there.

[0066] When demolding is performed, since the fixed mold 2 and the movable mold 3 are separated, the push rod 82 moves to the right under the magnetic force of the first magnetic block 84 and the second magnetic block 85, and the bottom of the blocking rod 83 is located at the inclined part of the second magnetic block 85. At this time, under the magnetic force of the second magnetic block 85, the blocking rod 83 moves close to the second magnetic block 85. At this time, a gap is generated between the blocking rod 83 and the core 4, which facilitates the smooth discharge of gas when gas is introduced.

[0067] It should be noted that the gas temperature entering the corrugated bag 91 can be 80 degrees Celsius to 100 degrees Celsius. When the gas enters the inside of the pipe, the inside of the polyethylene pipe is softened, reducing the bite between the core 4 and further improving the demolding efficiency.

[0068] It should be noted that when the gas is discharged, the relative rotation between the core 4 and the tube facilitates the gas to be discharged to different positions inside the tube, softening different positions, further reducing friction and improving demoulding efficiency.

[0069] The injection molding method for processing conductive plastics for cable shielding comprises the following steps:

[0070] S1, injection, the driving assembly 10 drives the movable mold 3 to move in the direction close to the fixed mold 2, so that the fixed mold 2 and the movable mold 3 are molded. At this time, the core 4 is located inside the ring sleeve 5, and the inner diameter of the ring sleeve 5 is larger than the inner part of the core 4. At this time, the molten raw material is extruded by the screw extrusion assembly 14, so that the molten raw material enters the gap between the core 4 and the ring sleeve 5, and then the coolant for cooling is introduced into the cooling chamber 13 to realize the molten raw material, so that the cable shielding sheath can be quickly formed;

[0071] S2, the driving assembly 10 drives the movable mold 3 to move away from the fixed mold 2, so when the movable mold 3 with the core 4 and the anti-shielding pipe fittings close to the core 4 are away from the fixed mold 2 and the ring sleeve 5, the anti-shielding pipe fittings can be easily separated from the inner side of the ring sleeve 5 due to the shrinkage of the polyethylene material after cooling. When the movable mold 3 with the core 4 and the anti-shielding pipe fittings close to the core 4 are completely separated from the ring sleeve 5 to the left and continue to move to the left for a distance, the left part of the connecting frame 64 begins to contact the inner left part of the body 1, and then Continue to move the movable mold 3 toward the left side. At this time, the connecting frame 64 is limited by the body 1, so that relative movement occurs between the movable mold 3, the core 4 and the connecting frame 64, the circular plate frame 61, the clamping frame 62 and the clamping plate 63. At this time, movement occurs between the clamping frame 62 and the limiting frame 66. In this process, under the limiting action of the limiting frame 66, the rotating shaft set on the limiting frame 66 rolls along the right inclined part of the clamping frame 62, causing the clamping frame 62 to produce a displacement close to the anti-shielding pipe.

[0072] When the rotating shaft of the limit frame 66 rolls along the right inclined part of the clamping frame 62 to the flat part of the top of the clamping frame 62, the inner side of the rubber anti-skid pad 612 is in close contact with the pipe fitting. At this time, the driving assembly 10 drives the movable mold 3 to continue to move away from the fixed mold 2, so that the clamping frame 62 and the clamping plate 63 continue to move relative to the core 4. Since the rubber anti-skid pad 612 clamps the pipe fitting at this time, the pipe fitting and the core 4 can move relative to each other. Since the circular plate frame 61 and the movable mold 3 produce relative movement, the fixed frame 73 and the guide installed inside thereof can be There is a relative motion between the slider 72 and the straight rod 71. During this process, since the guide slider 72 moves inside the spiral groove, the straight rod 71 can rotate with the core 4. With this design, when the pipe is separated from the core 4, the core 4 can rotate, and under the action of the clamping assembly 6, the pipe does not rotate. When the pipe is separated, if there is pure sliding friction between the inner wall of the pipe and the core 4, the friction coefficient is relatively high. When the pipe is separated, the pipe and the core 4 rotate to generate rolling friction on the contact surface, and the friction coefficient is relatively small, which can facilitate the separation of the pipe, thereby improving the processing efficiency.

[0073] And when the connecting frame 64 is limited by the body 1, the connecting frame 64 and the movable mold 3 produce relative movement. At this time, the gas inside the corrugated bag 91 enters the interior of the rotary joint 93, so that the gas enters the interior of the straight rod 71 through the rotary joint 93. The gas follows the vent cavity 86 into the interior of the cavity 88. At this time, it is discharged from the gap between the blocking rod 83 and the core 4, so that the gas enters between the pipe fitting and the core 4. In this way, the air forms an air film between the core 4 and the inner wall of the pipe fitting, and the direct contact solid-solid friction is converted into solid-gas-solid friction. The friction coefficient can be reduced, further reducing the difficulty of demolding the pipe fitting, thereby improving the demolding efficiency.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An injection molding device for processing conductive plastic for cable shielding, comprising a body (1), a screw extrusion assembly (14) for injecting plastic is arranged on the right side of the body (1), a fixed mold (2) is arranged on the body (1), a movable mold (3) is arranged on the left side of the fixed mold (2), a core (4) is arranged on the right side of the movable mold (3), a ring sleeve (5) is arranged on the left side of the fixed mold (2), and a cooling cavity (13) is opened inside the ring sleeve (5) for cooling, characterized in that: The injection molding device also includes: A clamping assembly (6) is arranged outside the core (4) and is used for clamping the core (4) when the injection molded part is demoulded. The clamping assembly (6) includes a circular plate frame (61). A clamping frame (62) is slidably provided on the right side of the circular plate frame (61). The circular plate frame (61) is provided with a connecting frame (64). The rotating assembly (7) is arranged on the left side of the core (4). The rotating assembly (7) includes a straight rod (71) arranged on the left side of the core (4). A spiral groove is provided on the left side of the straight rod (71). A guide slider (72) is arranged inside the spiral groove. A movable fixing frame (73) is provided outside the straight rod (71). When the guide slider (72) moves in the spiral groove, relative rotation occurs between the straight rod (71) and the fixing frame (73). The driving assembly (10) is used to drive the movable mold (3) to move left and right. When the movable mold (3) is driven away from the fixed mold (2), the connecting frame (64) contacts the left inner side of the machine body (1), so that the clamping assembly (6) and the movable mold (3) move relative to each other to demould the injection molded part.

2. The injection molding device based on conductive plastic processing for cable shielding according to claim 1 is characterized in that: The clamping frame (62) is provided with a plurality of clamping plates (63) on the right side of the clamping frame (62) passing through the movable mold (3). The fixing frame (73) is fixed to the guide slider (72), the fixing frame (73) is fixed to the circular plate frame (61), the clamping frame (62) slides with the movable mold (3), and the inner side of the clamping plate (63) is fixedly connected with a rubber anti-slip pad (612).

3. The injection molding device based on conductive plastic processing for cable shielding according to claim 2, characterized in that The clamping assembly (6) further comprises: The annular groove (65) is provided on the right side of the movable mold (3). The inner side of the annular groove (65) is fixedly connected to the limiting frame (66) at the position corresponding to the clamping frame (62). The right side of the clamping frame (62) is tilted and bent. The mounting ring (67) is arranged on the left side of the movable mold (3). The interior of the mounting ring (67) is fixedly connected to a fixed plate (68). The interior of the fixed plate (68) is slidably connected to a vertical rod (69). The bottom of the vertical rod (69) is fixedly connected to a frame (610). A first spring (611) is fixedly connected between the vertical rod (69) and the fixed plate (68). The clamping frame (62) passes through the interior of the frame (610).

4. The injection molding device based on conductive plastic processing for cable shielding according to claim 3 is characterized in that: The inner side of the frame (610) near the clamping frame (62) and the limiting frame (66) near the clamping frame (62) are both rotatably connected with a rotating shaft.

5. The injection molding device based on conductive plastic processing for cable shielding according to claim 1 is characterized in that: The right parts of the front and rear ends of the connecting frame (64) are fixedly connected with a long rod (11), the outer wall of the long rod (11) slides with the movable mold (3), the outer part of the long rod (11) is provided with a second spring (12), and the two ends of the second spring (12) are respectively fixed to the movable mold (3) and the connecting frame (64).

6. The injection molding device based on conductive plastic processing for cable shielding according to claim 1 is characterized in that The rotating assembly (7) further comprises: The blocking plate (74) is arranged on the outer wall of the straight rod (71) and is located on the left side of the movable mold (3). The distance between the core (4) and the straight rod (71) is greater than the thickness of the movable mold (3). The right part of the blocking plate (74) is rotated with a ball for reducing friction.

7. The injection molding device based on conductive plastic processing for cable shielding according to claim 1 is characterized in that The core (4) is provided with an injection assembly (8), which includes a circular groove (81) provided inside the core (4), a push rod (82) slidably connected inside the circular groove (81), a blocking rod (83) movably provided inside the core (4), the end curvature of the blocking rod (83) being adapted to the outer wall of the core (4), a first magnetic block (84) being fixedly connected to the left of the circular groove (81), a second magnetic block (85) being fixedly connected to the left of the push rod (82), the outer side of the second magnetic block (85) being tilted, the blocking rod (83) being tilted near the second magnetic block (85), and the interior of the straight rod (71) being hollow.

8. The injection molding device based on conductive plastic processing for cable shielding according to claim 7, characterized in that The jet assembly (8) further comprises: A vent cavity (86) is provided inside the core (4), the vent cavity (86) is connected to the inner hollow of the straight rod (71), a blocking plate (87) is fixedly connected to the outer wall of the blocking rod (83), a cavity (88) is provided inside the core (4) outside the blocking plate (87), the interior of the cavity (88) is inclined, and the interior of the cavity (88) is connected to the vent cavity (86).

9. The injection molding device based on conductive plastic processing for cable shielding according to claim 8, characterized in that: The right side of the movable mold (3) is provided with an air source assembly (9), which includes a bellows (91) fixed between the connecting frame (64) and the movable mold (3), an exhaust pipe (92) fixedly connected to the left side of the bellows (91), and a rotary joint (93) installed on the left end of the straight rod (71), the exhaust pipe (92) being connected to the rotary joint (93), an air intake pipe (94) fixedly connected to the right side of the bellows (91), and the exhaust pipe (92) being made of soft material.

10. An injection molding method for processing conductive plastics for cable shielding, characterized in that: The method is applicable to an injection molding device for processing conductive plastic for cable shielding according to any one of claims 1 to 9, comprising the following steps: S1, injection, the movable mold (3) and the fixed mold (2) are closed, and the molten raw material is injected through the screw extrusion assembly (14); S2, demoulding, the clamping assembly (6) clamps the molding material and generates relative motion with the core (4) to achieve demoulding.

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