A plastic parts injection molding automatic overmolding device

Abstract

The present invention discloses an automatic overmolding device for plastic parts injection molding, which relates to the technical field of injection molding machines, a main unit, which includes a support frame and a movable mold and a fixed mold arranged on the side of the support frame; and an injection unit, which is installed on the side of the support frame. By designing the processing cylinder to be composed of two release sections and a conveying section with different diameters, when the hollow screw and the reciprocating cylinder move in the release section, the release section with a relatively enlarged diameter provides a larger space and surface area, and the surface of the reciprocating cylinder arranged inside the release section is provided with an air suction section, so that the reciprocating cylinder reciprocates and exhausts the inside of the release section through the air suction section, so that the gas generated by the melting of the raw materials inside the release section is extracted by the reciprocating reciprocating cylinder, and the reciprocating reciprocating cylinder provides additional dynamic shearing and stirring effects, which further destroy the bubble structure in the melt and promote the gas to be dispersed and discharged more effectively.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding machines, and in particular to an automatic injection molding device for plastic parts. Background Art

[0002] The molding of plastic parts will transfer the material from the injection cavity to the mold cavity through the transfer molding process. This method first heats the plastic material to a certain temperature in the heating cavity, and then applies pressure through the plunger (or screw) to push it into the mold cavity for curing. If coating is required, the metal to be coated is placed in the mold in advance, and then injection coating molding is performed.

[0003] Chinese patent CN202310767021.5 discloses an exhaust type injection molding machine, which relates to the technical field of injection molding machines, and solves the problem that the exhaust gas of the exhaust type injection molding machine contains a large amount of water vapor, and the water vapor has a certain inhibitory effect on the adsorption capacity of activated carbon, resulting in poor filtering effect of activated carbon on the exhaust gas. The invention comprises a machine base, a hopper is installed at the feed port of the machine base, and an anti-blocking mechanism for preventing material blockage is installed at the discharge port of the hopper. Two symmetrically distributed exhaust structures for discharging gas or water vapor in the threaded barrel are installed on the outer side of the threaded barrel in the machine base, and the exhaust structure includes an exhaust structure fixedly installed on the upper end of the machine base; the above scheme can effectively avoid water vapor from inhibiting the adsorption capacity of the activated carbon filter element by installing the exhaust structure and the condensation structure; through the dredging component, it is conducive to automatically dredging the filter plate to avoid the accumulation of particles at the entrance end of the filter plate and affecting the filtering capacity of the filter plate to the gas.

[0004] The above patents and prior art have the following problems:

[0005] When the existing injection molding machine is performing injection molding, the gas generated by the melting of the raw material needs to be exhausted through the gap between the screw groove and the barrel. The gas is discharged through these narrow gap paths and is easily blocked by the melt, resulting in low efficiency of gas exhaust inside the melt. In addition, when the raw material is melted unevenly, large particles of unevenly melted raw materials are easily pushed to the injection port by the screw, causing accidental blockage, thereby affecting the efficiency of injection molding. Summary of the invention

[0006] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] A plastic parts injection automatic overmolding device, comprising:

[0009] A main body unit, the main body unit comprising a support frame and a movable mold and a fixed mold arranged on the side of the support frame;

[0010] An injection unit, the injection unit being mounted on a side of the support frame;

[0011] The injection unit includes a heating cylinder arranged on the top of the fixed mold, the heating cylinder is connected to the processing cylinder through a heating element, a hollow screw for conveying plasticized raw materials is rotatably arranged inside the processing cylinder, a reciprocating cylinder for disturbing the melt exhaust is movably arranged inside the hollow screw, an air suction section is arranged on the surface of the reciprocating cylinder, a reflux circular plate for filtering back large particle materials is movably arranged inside the reciprocating cylinder, and the reflux circular plate is conductively connected to the middle part of the hollow screw through the reciprocating cylinder and the reflux port.

[0012] As a preferred solution of the automatic injection molding device for plastic parts of the present invention, wherein:

[0013] A mounting platform is installed on the top of the support frame, a material discharge head is installed on the top of the mounting platform, and the material discharge head is conductively connected with the processing cylinder through a material discharge pipe;

[0014] The mounting platform is fixedly connected via a pulling rod and a pull ring, a heating cylinder is fixedly connected inside the pull ring, and a downward pressure driving source is fixedly connected to the bottom of the mounting platform.

[0015] As a preferred solution of the automatic injection molding device for plastic parts of the present invention, wherein:

[0016] The injection unit further comprises a synchronization plate, the output shaft of the downward pressure driving source is fixedly connected to the top of the synchronization plate, and the bottom of the synchronization plate is fixedly connected to a rotation driving source and a fixed back plate;

[0017] The fixed back plate is slidably connected with the sliding strip on the surface of the reciprocating cylinder through the second movable groove.

[0018] As a preferred solution of the automatic injection molding device for plastic parts of the present invention, wherein:

[0019] The surface of the fixed back plate is symmetrically provided with a moving groove 1, and the inside of the symmetrical moving groove 1 is slidably provided with a main tooth plate and a slave tooth plate;

[0020] The symmetrical surfaces of the main tooth plate and the slave tooth plate are provided with teeth, the main tooth plate is meshed and connected with the slave tooth plate through a rotating member, the rotating member is rotatably arranged on the surface of the fixed back plate, the bottom of the slave tooth plate is fixedly connected with a cross plate, and the bottom of the cross plate is fixedly connected with a moving rod.

[0021] As a preferred solution of the automatic injection molding device for plastic parts of the present invention, wherein:

[0022] A rotating cylinder is rotatably arranged inside the treatment cylinder, and a reciprocating cylinder is slidably arranged inside the rotating cylinder and the hollow screw;

[0023] A closed rail is provided on the surface of the rotating cylinder, the interior of the closed rail is rollingly connected to one end of the insertion roller head, and the other end of the insertion roller head is fixedly connected to the surface of the reciprocating cylinder;

[0024] The closed rail is composed of an upper rail, a lower rail and two oblique connecting rails between the upper rail and the lower rail.

[0025] As a preferred solution of the automatic injection molding device for plastic parts of the present invention, wherein:

[0026] The processing cylinder is composed of a release section and a conveying section, and the diameter of the release section is larger than the diameter of the conveying section;

[0027] The discharge head is connected to the conveying section through a discharge pipe, and hollow screws are provided for rotation inside the release section and the conveying section;

[0028] The part of the reciprocating cylinder arranged at the release section is provided with an air suction section, and the surface of the air suction section is evenly provided with air holes. The moving rod is slidably connected with the surface of the reciprocating cylinder through a circular scraper.

[0029] As a preferred solution of the automatic injection molding device for plastic parts of the present invention, wherein:

[0030] The bottom of the synchronous plate is fixedly connected with a fixed plate, the synchronous plate is fixedly connected with a clamping sleeve through the fixed plate, the inner part of the clamping sleeve is rotatably clamped with a clamping ring, and the clamping ring is fixedly sleeved on the surface of the rotating cylinder;

[0031] The rotating cylinder is rotatably arranged inside the conveying section, and a hollow screw is fixedly connected to the bottom end of the rotating cylinder arranged inside the conveying section.

[0032] As a preferred solution of the automatic injection molding device for plastic parts of the present invention, wherein:

[0033] The reciprocating cylinder and the synchronous plate are fixedly connected with a connecting plate on the opposite side, and a second air guide pipe is conductively connected between the top of the connecting plate and the filter;

[0034] The connecting plate is movably passed through the conveying section and the push ring for fixed connection via a movable rod, and a push ring is movably arranged between the hollow screw and the conveying section.

[0035] As a preferred solution of the automatic injection molding device for plastic parts of the present invention, wherein:

[0036] A middle sealing block is fixedly arranged in the middle of the reciprocating cylinder, a convex head is arranged at the bottom of the middle sealing block, and a moving rod is movably arranged in the middle of the middle sealing block and the convex head;

[0037] The convex head is provided with a partition rod corresponding to the surface of the reciprocating cylinder, and a reflux port is provided between adjacent partition rods. A reflux circular plate is fixedly connected to the bottom of the moving rod, and through holes are evenly provided on the surface of the reflux circular plate. An extension ring is installed upward on the outer contour of the reflux circular plate.

[0038] The bottom of the hollow screw is fixedly connected with a plunger, the surface ring of the plunger is provided with a sealing ring, the inner ring of the bottom end of the release section is provided with a check ring, the plunger is rotatably connected to the check ring through the sealing ring, and the bottom of the release section is conductively connected with an injection head.

[0039] As a preferred solution of the automatic injection molding device for plastic parts of the present invention, wherein:

[0040] The main unit comprises a support frame, a lifting cavity is fixedly connected to the bottom of the support frame, an auxiliary rod and a lifting driving source are fixedly connected to the bottom end of the lifting cavity, a movable mold is slidably arranged on the surface of the auxiliary rod, an output shaft of the lifting driving source is fixedly connected to the middle part of the bottom surface of the movable mold, and a fixed mold is fixedly connected to the top of the auxiliary rod;

[0041] The side of the support frame is fixedly connected with an air extraction member, and the air extraction member is conductively connected with the filter through an air guide pipe.

[0042] Beneficial effects of the present invention:

[0043] 1. By adding the raw materials to be processed into the inside of the discharge head, the solenoid valve installed in the discharge pipe is opened, so that the raw materials inside the discharge pipe enter the inside of the conveying section, and the rotary drive source and the heating element are started, the rotary drive source is rotated and the transmission of the pulley and the driven member is made to drive the rotating cylinder to rotate, and the rotation of the rotating cylinder will drive the hollow screw inside the processing cylinder to rotate, so that the hollow screw drives the raw materials entering the processing cylinder to move along the conveying section to the release section, and starting the heating element will heat the processing cylinder, so that in the process of the hollow screw conveying the raw materials, the heating element heats and plasticizes the raw materials conveyed by the hollow screw.

[0044] Second, the closed rail opened on its surface drives the internal roller head to move along the upper rail, the oblique connecting rail and the lower rail in the closed rail, and there is a height difference between the upper rail and the lower rail, and then when the upper rail and the lower rail in the closed rail are in rolling contact with the roller head respectively, the reciprocating cylinder will be driven to move up and down, and the oblique connecting rail will be connected between the upper rail and the lower rail, acting as a transfer traction between the upper rail and the lower rail, and the reciprocating cylinder will reciprocate inside the hollow screw, thereby increasing the activity of the raw materials between the hollow screw and the processing cylinder, that is, under the push of the reciprocating cylinder, the raw materials close to the reciprocating cylinder are pushed between the hollow screw and the processing cylinder, increasing the shear force generated when the hollow screw rotates, and the processing effect on the raw materials inside the hollow screw, so that the reciprocating cylinder increases the raw materials when the heating element heats and melts the raw materials during the reciprocating motion, so that the raw materials are melted more evenly and mixed more fully.

[0045] Third, by designing the processing cylinder to consist of a release section and a conveying section with two different diameters, the diameter of the release section is made larger than the diameter of the conveying section, and then when the hollow screw and the reciprocating cylinder move in the release section, the release section with a relatively enlarged diameter provides a larger space and surface area, which is more conducive to more efficient exhaust when the raw materials are melted, and the surface of the reciprocating cylinder arranged inside the release section is provided with an air suction section, and then when the reciprocating cylinder moves in the release section, the vacuum member is started to exhaust the inside of the reciprocating cylinder, and combined with the reciprocating motion of the reciprocating cylinder and the large space change brought about by the release section with an enlarged diameter, the reciprocating cylinder exhausts the inside of the release section through the air suction section. The reciprocating motion for exhaust makes the exhaust range more flexible and larger, so that the gas generated by the melting of the raw materials in the release section can be extracted by the reciprocating reciprocating cylinder, and the reciprocating reciprocating cylinder provides additional dynamic shearing and stirring effects, which further destroy the bubble structure in the melt and promote the gas to be more effectively dispersed and discharged. The reciprocating cylinder is arranged inside the hollow screw, which is equivalent to being wrapped by the melt. Therefore, in the reciprocating motion of the reciprocating cylinder, the gas inside the melt can be discharged more directly through the suction section, which is different from the existing exhaust through the gap between the screw and the cylinder, which requires gas to gather and float through the melt to block the exhaust.

[0046] Fourth, by spraying a wear-resistant ceramic coating on the surface of the reciprocating cylinder, the reciprocating cylinder and the hollow screw can fit and slide in contact, and the wear of the reciprocating cylinder is reduced under the action of the coating. The reciprocating motion of the reciprocating cylinder relative to the hollow screw and the rotation of the hollow screw on the surface of the reciprocating cylinder can make the suction section on the surface of the reciprocating cylinder intermittently scraped by the hollow screw, thereby reducing the coverage and blockage of the suction section by the melt, which is convenient for improving the exhaust effect of the suction section.

[0047] 5. The reciprocating motion of the reciprocating cylinder will drive the connecting plate and the movable rod to reciprocate along the fixed back plate, so that the movable rod passes through the conveying section and drives the push ring to reciprocate inside the conveying section, so that the reciprocating push ring pushes the raw material that falls into the processing cylinder to move forward, thereby reducing the blockage of the material discharge pipe, and by giving the raw material additional thrust, and then through the raw material to the push ring The thrust is transmitted, the raw material is subjected to an additional thrust other than the rotating conveying of the hollow screw, so that the raw material pushes the melt forward, thereby partially reducing the reflux phenomenon of the reciprocating cylinder and the hollow screw in the transmission of the melt. When the push ring is reset, it will not generate excessive additional suction because its front end is unmelted raw material.

[0048] 6. When the reciprocating cylinder moves upward, it will be transmitted through the main tooth plate and the rotating part as well as the slave tooth plate, so that the horizontal plate and the moving rod at the bottom of the slave tooth plate will move downward, so that the moving rod will drive the reflux circular plate to extend out of the reciprocating cylinder, so that the extended reflux circular plate can improve the mixing effect of the hollow screw and the release section.

[0049] 7. When the reciprocating cylinder moves downward, the main tooth plate, the rotating part and the transmission from the tooth plate will cause the moving rod at the bottom of the slave tooth plate to move upward, so that when the moving rod moves upward, it will drive the reflux circular plate to move upward, so that the melt at the front end of the hollow screw is filtered by the upwardly lifted reflux circular plate, so that the large particles of raw materials inside the melt are retained in the space surrounded by the extension ring and the reflux circular plate, and with the lifting of the reflux circular plate, the extension ring and the moving rod, the reflux circular plate and the extension ring move to the inside of the reciprocating cylinder, and the reflux circular plate finally contacts with the convex head, and with the blocking and dispersion of the convex head, the large particles of material are dispersed by the convex head and discharged through the reflux port to between the hollow screw and the release section, so that the large particles of raw materials filtered by the reflux circular plate are sheared and melted again by the hollow screw, thereby improving the melting and plasticization degree of the raw materials inside the release section, and when the reflux circular plate contacts with the convex head, the reflux circular plate and the extension ring will block and seal the reflux port.

[0050] 8. By starting the downward pressure driving source, the downward pressure driving source pushes the synchronous plate, the reciprocating cylinder and the rotating cylinder downward, so that the hollow screw at the front end of the rotating cylinder drives the plunger and the sealing ring away from the surface of the check ring, so that the seal between the sealing ring and the check ring is opened, and the rotation of the hollow screw and the push of the plunger allow the plasticized melt to enter the interior of the fixed mold through the injection head. Before the injection head injects the melt into the fixed mold, the lifting driving source is started to cause the movable mold to drive the metal parts artificially placed on its surface to move upward, so that the movable mold and the fixed mold are closed, and then after the injection head injects the melt into the interior of the fixed mold, the melt will be dispersed inside the closed fixed mold and movable mold, thereby overmolding the metal parts inside the fixed mold and the movable mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the following is a brief introduction to the drawings required for describing the embodiment, wherein:

[0052] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0053] Figure 2 This is a schematic diagram of the structural connection of the injection molding unit of the present invention;

[0054] Figure 3 for Figure 2 A schematic diagram of the enlarged structure of part A;

[0055] Figure 4 This is a schematic diagram of the internal structure connection of the injection molding unit of the present invention;

[0056] Figure 5 for Figure 4 A schematic diagram of the enlarged structure of part B;

[0057] Figure 6 for Figure 4 A schematic diagram of the enlarged structure of the middle C part;

[0058] Figure 7 for Figure 4 A schematic diagram of the enlarged structure of the D part;

[0059] Figure 8 for Figure 4 A schematic diagram of the enlarged structure of part E in the middle;

[0060] Fig. 9 for Figure 5 A schematic diagram of the enlarged structure of part F;

[0061] Fig.10 This is a schematic diagram of the internal structure of the closed rail of the present invention;

[0062] Fig.11 for Figure 4 A schematic diagram of a top view of the cross-section of the bottom of the middle moving rod;

[0063] Fig.12 for Fig.11 A schematic diagram of the enlarged structure of the G portion;

[0064] Fig.13 It is a schematic diagram of the internal structure connection of the treatment cylinder of the present invention.

[0065] In the figure:

[0066] 1. Main unit; 101. Support frame; 102. Lifting cavity; 1021. Auxiliary rod; 1022. Lifting driving source; 103. Moving mold; 104. Fixed mold; 105. Mounting table; 1051. Feeding head; 1052. Feeding pipe; 1053. Pulling rod; 1054. Pull ring; 106. Air extraction part; 1061. Air guide pipe 1; 1062. Filter; 10621. Air guide pipe 2;

[0067] 2. Injection unit; 201. Heating cylinder; 2011. Heating element; 202. Processing cylinder; 2021. Release section; 20211. Check ring; 20212. Injection head; 2022. Conveying section; 203. Rotating cylinder; 2031. Hollow screw; 2032. Plunger; 20321. Sealing ring; 2033. Pulley; 20331. Follower; 2034. Rotary drive source; 2035. Cardan; 2036. Cardan sleeve; 2037. Fixed plate; 2038. Closing rail; 20381. Upper rail; 20382. Oblique connecting rail; 20383. Lower rail; 204. Reciprocating cylinder; 2 041, connecting plate; 20411, movable rod; 20412, push ring; 2042, main tooth plate; 2043, suction section; 2044, middle sealing block; 20441, convex head; 2045, dividing rod; 2046, reflux port; 2047, roller plug head; 2048, slide bar; 205, synchronous plate; 206, downward pressure driving source; 207, fixed back plate; 2071, moving groove one; 2072, rotating part; 2073, slave tooth plate; 2074, horizontal plate; 2075, moving rod; 20751, circular scraper; 2076, reflux circular plate; 20761, extension ring; 2077, moving groove two. DETAILED DESCRIPTION Embodiment 1

[0068] like Figure 1-13 As shown, a plastic parts injection molding automatic overmolding device comprises:

[0069] A main body unit 1, the main body unit 1 comprises a support frame 101 and a movable mold 103 and a fixed mold 104 arranged on the side of the support frame 101;

[0070] An injection unit 2, the injection unit 2 being installed on the side of the support frame 101;

[0071] The injection unit 2 includes a heating cylinder 201 arranged on the top of the fixed mold 104, the heating cylinder 201 is connected to the processing cylinder 202 through a heating element 2011, the processing cylinder 202 is internally rotatably provided with a hollow screw 2031 for conveying plasticized raw materials, the hollow screw 2031 is internally movable and provided with a reciprocating cylinder 204 for disturbing the melt exhaust, the surface of the reciprocating cylinder 204 is provided with a suction section 2043, the internal movable arrangement of the reciprocating cylinder 204 is used to pull a reflux circular plate 2076 for filtering back large particle materials, the reflux circular plate 2076 is conductively connected to the middle part of the hollow screw 2031 through the reciprocating cylinder 204 and the reflux port 2046, the heating element 2011 is preferably a heating coil, which is powered by an external energy source and controlled by a unified PLC.

[0072] like Figure 1-3 As shown, the main unit 1 includes a support frame 101, a lifting cavity 102 is fixedly connected to the bottom of the support frame 101, an auxiliary rod 1021 and a lifting driving source 1022 are fixedly connected to the bottom end of the lifting cavity 102, a movable mold 103 is slidably provided on the surface of the auxiliary rod 1021, an output shaft of the lifting driving source 1022 is fixedly connected to the middle of the bottom surface of the movable mold 103, and a fixed mold 104 is fixedly connected to the top of the auxiliary rod 1021;

[0073] The side of the support frame 101 is fixedly connected with an exhaust component 106, which is preferably an air pump and is powered by an external energy source and controlled by a unified PLC. The exhaust component 106 is connected through an air duct 1061 and a filter 1062, and the filter 1062 is preferably an activated carbon filter. The air duct 1061 and the air duct 2 10621 are preferably high-temperature resistant telescopic hoses.

[0074] like Figure 1-4 As shown, a mounting platform 105 is installed on the top of the support frame 101, and a material discharge head 1051 is installed on the top of the mounting platform 105. The material discharge head 1051 is connected to the processing cylinder 202 through a material discharge pipe 1052. Preferably, a solenoid valve is provided inside the material discharge pipe 1052;

[0075] The mounting platform 105 is fixedly connected via a pull rod 1053 and a pull ring 1054, a heating tube 201 is fixedly connected inside the pull ring 1054, a downward pressure driving source 206 is fixedly connected to the bottom of the mounting platform 105, and the downward pressure driving source 206 is preferably a pneumatic cylinder or an oil cylinder, powered by an external energy source and controlled by a unified PLC.

[0076] like Figure 3-5 Shown and Figure 11-12As shown, the injection unit 2 further includes a synchronization plate 205, the output shaft of the downward pressure driving source 206 is fixedly connected to the top of the synchronization plate 205, and the bottom of the synchronization plate 205 is fixedly connected to a rotation driving source 2034 and a fixed back plate 207, and the rotation driving source 2034 is preferably a servo motor, which is powered by an external energy source and controlled by a unified PLC;

[0077] The fixed back plate 207 is slidably connected to the sliding strip 2048 on the surface of the reciprocating cylinder 204 via the second movable groove 2077 .

[0078] like Figure 5-6 As shown, the surface of the fixed back plate 207 is symmetrically provided with a moving groove 2071, and the main tooth plate 2042 and the slave tooth plate 2073 are symmetrically provided inside the moving groove 2071;

[0079] The symmetrical surfaces of the main tooth plate 2042 and the slave tooth plate 2073 are provided with teeth, the main tooth plate 2042 is meshedly connected with the slave tooth plate 2073 through a rotating member 2072, the rotating member 2072 is preferably a transmission gear, the rotating member 2072 is rotatably set on the surface of the fixed back plate 207, the bottom of the slave tooth plate 2073 is fixedly connected with a horizontal plate 2074, and the bottom of the horizontal plate 2074 is fixedly connected with a moving rod 2075.

[0080] like Figure 5-6 and Figure 9-10 As shown, a rotating cylinder 203 is rotatably arranged inside the treatment cylinder 202, and a reciprocating cylinder 204 is slidably arranged inside the rotating cylinder 203 and the hollow screw 2031;

[0081] The surface of the rotating cylinder 203 is provided with a closed rail 2038, the interior of the closed rail 2038 is rollingly connected with one end of the plug-in roller head 2047, and the other end of the plug-in roller head 2047 is fixedly connected to the surface of the reciprocating cylinder 204;

[0082] The closed rail 2038 is composed of an upper rail 20381, a lower rail 20383 and two oblique connecting rails 20382 between the upper rail 20381 and the lower rail 20383.

[0083] Operation process:

[0084] The raw materials to be processed are loaded into the discharge head 1051, and the electromagnetic valve installed in the discharge pipe 1052 is opened, so that the raw materials in the discharge pipe 1052 enter the conveying section 2022, and the rotary drive source 2034 and the heating element 2011 are started, so that the rotary drive source 2034 rotates and drives the rotating cylinder 203 through the pulley 2033 and the driven element 20331, and the rotation of the rotating cylinder 203 drives the hollow screw 2031 in the processing cylinder 202 to rotate, so that the hollow screw 2031 drives the raw materials entering the processing cylinder 202 to move along the conveying section 2022 to the release section 2021, and the starting of the heating element 2011 heats the processing cylinder 202, so that when the hollow screw 2031 is conveying the raw materials, the heating element 2011 heats and plasticizes the raw materials conveyed by the hollow screw 2031;

[0085] When the rotating cylinder 203 rotates, the closed rail 2038 provided on the surface thereof drives the roller inserting head 2047 inside thereof to move along the upper rail 20381, the oblique connecting rail 20382 and the lower rail 20383 in the closed rail 2038. There is a height difference between the upper rail 20381 and the lower rail 20383. When the upper rail 20381 and the lower rail 20383 in the closed rail 2038 respectively roll in contact with the roller inserting head 2047, the reciprocating cylinder 204 is driven to move up and down. The oblique connecting rail 20382 is connected between the upper rail 20381 and the lower rail 20383, acting as the upper rail 2038 1 and the lower moving rail 20383, and the reciprocating cylinder 204 will reciprocate inside the hollow screw 2031, thereby improving the activity of the raw materials between the hollow screw 2031 and the processing cylinder 202, that is, under the push of the reciprocating cylinder 204, the raw materials close to the reciprocating cylinder 204 are pushed to between the hollow screw 2031 and the processing cylinder 202, and the shear force generated when the hollow screw 2031 rotates is increased. The processing effect on the raw materials inside the hollow screw 2031 is increased, and the reciprocating cylinder 204 increases the raw materials when the heating element 2011 heats and melts the raw materials during the reciprocating motion, so that the raw materials are melted more evenly and mixed more fully. Embodiment 2

[0086] This embodiment is different from the first embodiment in that:

[0087] like Figure 3-4 and Fig.13 As shown, the treatment cylinder 202 is composed of a release section 2021 and a conveying section 2022, and the diameter of the release section 2021 is larger than the diameter of the conveying section 2022;

[0088] The discharge head 1051 is connected to the conveying section 2022 through the discharge pipe 1052, and the release section 2021 and the conveying section 2022 are internally rotatably provided with a hollow screw 2031;

[0089] The reciprocating cylinder 204 is provided with an air suction section 2043 at the release section 2021 , and the surface of the air suction section 2043 is evenly provided with air holes. The moving rod 2075 is slidably connected to the surface of the reciprocating cylinder 204 through a circular scraper 20751 .

[0090] Preferably, the circular scraper 20751 supports the moving rod 2075 inside the reciprocating cylinder 204 to reduce the stability of the moving rod 2075 during movement.

[0091] like Figure 3-5 and Fig. 9 As shown, the bottom of the synchronous plate 205 is fixedly connected with a fixed plate 2037, and the synchronous plate 205 is fixedly connected with a clamping sleeve 2036 through the fixed plate 2037. The inner part of the clamping sleeve 2036 is rotatably clamped with a snap ring 2035, and the snap ring 2035 is fixedly sleeved on the surface of the rotating cylinder 203;

[0092] The surface of the rotating drum 203 and the bottom of the rotating driving source 2034 are both fixedly connected with pulleys 2033, and the two pulleys 2033 are connected through a driven member 20331, and the driven member 20331 is preferably a belt;

[0093] The rotating cylinder 203 is rotatably disposed inside the conveying section 2022 , and a hollow screw 2031 is fixedly connected to the bottom end of the rotating cylinder 203 disposed inside the conveying section 2022 .

[0094] like Figure 1-6 As shown, the reciprocating cylinder 204 and the synchronous plate 205 are fixedly connected with a connecting plate 2041 on their opposite surfaces. The surface of the connecting plate 2041 is provided with a notch that matches the surface contours of the fixed back plate 207 and the second movable groove 2077. The top of the connecting plate 2041 is connected to the filter 1062 by a second air guide pipe 10621.

[0095] The connecting plate 2041 is movably connected through the conveying section 2022 and the push ring 20412 by the movable rod 20411, and a push ring 20412 is movably arranged between the hollow screw 2031 and the conveying section 2022. Preferably, the movable range of the push ring 20412 is arranged between the connection position of the rotating cylinder 203 and the hollow screw 2031 and the connection position of the discharge pipe 1052 relative to the conveying section 2022.

[0096] like Figure 7-8As shown, a middle sealing block 2044 is fixedly provided in the middle of the reciprocating cylinder 204, a convex head 20441 is provided at the bottom of the middle sealing block 2044, and a moving rod 2075 is movably provided in the middle of the middle sealing block 2044 and the convex head 20441;

[0097] The convex head 20441 is provided with a partition rod 2045 corresponding to the surface of the reciprocating cylinder 204, and a reflux port 2046 is provided between adjacent partition rods 2045. A reflux circular plate 2076 is fixedly connected to the bottom of the moving rod 2075, and through holes are evenly provided on the surface of the reflux circular plate 2076. An extension ring 20761 is installed upwardly on the outer contour of the reflux circular plate 2076.

[0098] The bottom of the hollow screw 2031 is fixedly connected to a plunger 2032, the surface ring of the plunger 2032 is provided with a sealing ring 20321, the inner ring of the bottom end of the release section 2021 is provided with a check ring 20211, the plunger 2032 is rotatably connected to the check ring 20211 via the sealing ring 20321, the sealing ring 20321 and the check ring 20211 are movably sealed via a sealing ring or a filler or mechanically sealed during rotation, the bottom of the release section 2021 is conductively connected to an injection head 20212, a sealing ring 20321 is movably provided between the injection head 20212 and the check ring 20211.

[0099] It should be noted that mechanical seals are preferably used between the rotating cylinder 203 and the conveying section 2022, and packing seals or piston seals are preferably used between the rotating cylinder 203 and the reciprocating cylinder 204, between the middle sealing block 2044 and the moving rod 2075, and between the circular scraper 20751 and the reciprocating cylinder 204.

[0100] The rest of the structure is the same as that of the first embodiment.

[0101] Operation process:

[0102] By designing the processing cylinder 202 to consist of a release section 2021 and a conveying section 2022 of two different diameters, the diameter of the release section 2021 is made larger than the diameter of the conveying section 2022, and then when the hollow screw 2031 and the reciprocating cylinder 204 move in the release section 2021, the release section 2021 with a relatively enlarged diameter provides a larger space and surface area, which is more conducive to more efficient exhaust when the raw material is melted, and the surface of the reciprocating cylinder 204 arranged inside the release section 2021 is provided with an air suction section 2043, and then when the reciprocating cylinder 204 moves in the release section 2021, the suction member 106 is started to cause the suction member 106 to evacuate the interior of the reciprocating cylinder 204, and combined with the reciprocating motion of the reciprocating cylinder 204 and the large space change brought about by the release section 2021 with an enlarged diameter, The reciprocating cylinder 204 performs reciprocating motion to evacuate the interior of the release section 2021 through the suction section 2043, making the range of suction more flexible and larger, so that the gas generated by the melting of the raw materials in the release section 2021 is extracted by the reciprocating reciprocating cylinder 204, and the reciprocating reciprocating cylinder 204 provides additional dynamic shearing and stirring effects, which further destroy the bubble structure in the melt, prompting the gas to be more effectively dispersed and discharged, and the reciprocating cylinder 204 is arranged inside the hollow screw 2031, which is equivalent to being wrapped by the melt. Therefore, during the reciprocating motion of the reciprocating cylinder 204, the gas inside the melt can be more directly discharged through the suction section 2043, which is different from the existing exhaust through the gap between the screw and the cylinder, which requires gas to gather and float through the melt to block the exhaust.

[0103] By spraying a wear-resistant ceramic coating on the surface of the reciprocating cylinder 204, the reciprocating cylinder 204 and the hollow screw 2031 can be in close sliding contact, and the wear of the reciprocating cylinder 204 is reduced under the action of the coating. The reciprocating motion of the reciprocating cylinder 204 relative to the hollow screw 2031 and the rotation of the hollow screw 2031 on the surface of the reciprocating cylinder 204 can make the suction section 2043 on the surface of the reciprocating cylinder 204 intermittently scraped by the hollow screw 2031, thereby reducing the coverage and blockage of the suction section 2043 by the melt, thereby facilitating improving the exhaust effect of the suction section 2043.

[0104] Of course, in order to reduce the melt on the surface of the air suction section 2043 from entering the interior of the reciprocating cylinder 204, a fine filter is installed on the surface of the air hole of the air suction section 2043, and the pore size of the filter is less than 10 microns, and a porous ceramic membrane is installed on the surface of the air hole arranged inside the reciprocating cylinder 204, so that the gas passes through and the melt passes through less;

[0105] The reciprocating motion of the reciprocating cylinder 204 will drive the connecting plate 2041 and the movable rod 20411 to reciprocate along the fixed back plate 207, so that the movable rod 20411 passes through the conveying section 2022 and drives the push ring 20412 to reciprocate inside the conveying section 2022, so that the reciprocating push ring 20412 pushes the raw materials falling into the processing cylinder 202 to move forward, thereby reducing the blockage of the material discharge of the discharge pipe 1052, and by giving the raw materials additional thrust, and then through the raw materials transmitting the thrust of the push ring 20412, the raw materials are subjected to the additional thrust outside the rotation and transportation of the hollow screw 2031, so that the raw materials push the melt forward, thereby partially reducing the reflux phenomenon of the reciprocating cylinder 204 and the hollow screw 2031 in the transmission of the melt, and when the push ring 20412 is reset, because the front end of the push ring 20412 is the unmelted raw material, it will not generate excessive additional suction;

[0106] The reciprocating cylinder 204 is sleeved on the surface of the fixed back plate 207, so that the reciprocating cylinder 204 is slidably connected with the second moving groove 2077 on the surface of the fixed back plate 207 through the sliding bar 2048. When the reciprocating cylinder 204 slides on the surface of the fixed back plate 207, the main tooth plate 2042 on the surface of the reciprocating cylinder 204 drives the rotating member 2072 to rotate along the first moving groove 2071, and the rotation of the rotating member 2072 drives the slave tooth plate 2073 to do the opposite movement.

[0107] When the reciprocating cylinder 204 moves upward, the main tooth plate 2042, the rotating member 2072 and the slave tooth plate 2073 transmit, so that the horizontal plate 2074 and the moving rod 2075 at the bottom of the slave tooth plate 2073 move downward, so that the moving rod 2075 drives the reflux circular plate 2076 to extend out of the reciprocating cylinder 204, so that the extended reflux circular plate 2076 improves the mixing effect of the hollow screw 2031 and the release section 2021;

[0108] When the reciprocating cylinder 204 moves downward, the main tooth plate 2042, the rotating member 2072 and the slave tooth plate 2073 transmit the movement, so that the moving rod 2075 at the bottom of the slave tooth plate 2073 moves upward, so that when the moving rod 2075 moves upward, it drives the reflux circular plate 2076 to move upward, so that the melt at the front end of the hollow screw 2031 is filtered by the upwardly lifted reflux circular plate 2076, so that the large particles of raw materials in the melt are retained in the space surrounded by the extension ring 20761 and the reflux circular plate 2076, and as the reflux circular plate 2076, the extension ring 20761 and the moving rod 2075 are lifted, the reflux circular plate 2076 and the extension ring 2076 are lifted. 761 moves to the inside of the reciprocating cylinder 204, and makes the reflux circular plate 2076 finally contact with the protrusion 20441, and with the blocking and dispersion of the protrusion 20441, the large particle material is dispersed by the protrusion 20441 and discharged through the reflux port 2046 to between the hollow screw 2031 and the release section 2021, so that the large particle raw material filtered by the reflux circular plate 2076 is sheared and melted again by the hollow screw 2031, thereby improving the melting and plasticization degree of the raw material inside the release section 2021, and when the reflux circular plate 2076 contacts with the protrusion 20441, the reflux circular plate 2076 and the extension ring 20761 will block and seal the reflux port 2046.

[0109] When the raw material inside the release section 2021 is melted and plasticized within a preset time, the downward pressure driving source 206 is started, and the downward pressure driving source 206 pushes the synchronous plate 205, the reciprocating cylinder 204 and the rotating cylinder 203 to move downward, so that the hollow screw 2031 at the front end of the rotating cylinder 203 drives the plunger 2032 and the sealing ring 20321 to move away from the surface of the check ring 20211, so that the seal between the sealing ring 20321 and the check ring 20211 is opened, and the rotation of the hollow screw 2031 and the push of the plunger 2032 make the plasticized The melt enters the interior of the fixed mold 104 through the injection head 20212. Before the injection head 20212 injects the melt into the fixed mold 104, the lifting drive source 1022 is started, so that the movable mold 103 drives the metal parts artificially placed on its surface to move upward, so that the movable mold 103 and the fixed mold 104 are closed. After the injection head 20212 injects the melt into the interior of the fixed mold 104, the melt will be dispersed inside the closed fixed mold 104 and the movable mold 103, thereby overmolding the metal parts inside the fixed mold 104 and the movable mold 103.

Claims

1. A plastic parts automatic injection molding device, characterized in that: include: A main body unit (1), the main body unit (1) comprising a support frame (101) and a movable mold (103) and a fixed mold (104) arranged on the side of the support frame (101); An injection molding unit (2), the injection molding unit (2) being mounted on a side of the support frame (101); The injection unit (2) comprises a heating cylinder (201) arranged on the top of a fixed mold (104); the heating cylinder (201) is connected to a processing cylinder (202) via a heating element (2011); a hollow screw (2031) for conveying plasticized raw materials is rotatably arranged inside the processing cylinder (202); a reciprocating cylinder (204) for disturbing melt exhaust is movably arranged inside the hollow screw (2031); a suction section (2043) is arranged on the surface of the reciprocating cylinder (204); a reflux circular plate (2076) for pulling and filtering back large particle materials is movably arranged inside the reciprocating cylinder (204); and the reflux circular plate (2076) is conductively connected to the middle of the hollow screw (2031) via the reciprocating cylinder (204) and a reflux port (2046).

2. The automatic injection molding device for plastic parts according to claim 1, characterized in that: A mounting platform (105) is installed on the top of the support frame (101), a material discharge head (1051) is installed on the top of the mounting platform (105), and the material discharge head (1051) is conductively connected to the processing cylinder (202) via a material discharge pipe (1052); The mounting platform (105) is fixedly connected via a pulling rod (1053) and a pull ring (1054); a heating cylinder (201) is fixedly connected inside the pull ring (1054); and a downward pressure driving source (206) is fixedly connected to the bottom of the mounting platform (105).

3. The automatic injection molding device for plastic parts according to claim 2, characterized in that: The injection unit (2) further comprises a synchronization plate (205), the output shaft of the downward pressure driving source (206) is fixedly connected to the top of the synchronization plate (205), and the bottom of the synchronization plate (205) is fixedly connected to a rotation driving source (2034) and a fixed back plate (207); The fixed back plate (207) is slidably connected via a second movable groove (2077) and a sliding strip (2048) on the surface of the reciprocating cylinder (204).

4. The automatic injection molding device for plastic parts according to claim 3, characterized in that: The surface of the fixed back plate (207) is symmetrically provided with a moving groove 1 (2071), and a main tooth plate (2042) and a slave tooth plate (2073) are slidably provided inside the symmetrical moving groove 1 (2071); Symmetrical surfaces of the main tooth plate (2042) and the slave tooth plate (2073) are provided with teeth; the main tooth plate (2042) is meshedly connected with the slave tooth plate (2073) via a rotating member (2072); the rotating member (2072) is rotatably arranged on the surface of a fixed back plate (207); the bottom of the slave tooth plate (2073) is fixedly connected to a transverse plate (2074); the bottom of the transverse plate (2074) is fixedly connected to a moving rod (2075).

5. The automatic injection molding device for plastic parts according to claim 4, characterized in that: A rotating cylinder (203) is rotatably disposed inside the treatment cylinder (202), and a reciprocating cylinder (204) is slidably disposed inside the rotating cylinder (203) and the hollow screw (2031); A closed rail (2038) is provided on the surface of the rotating cylinder (203), the interior of the closed rail (2038) is rollingly connected to one end of the insertion roller head (2047), and the other end of the insertion roller head (2047) is fixedly connected to the surface of the reciprocating cylinder (204); The closed rail (2038) is composed of an upper rail (20381), a lower rail (20383), and two oblique connecting rails (20382) between the upper rail (20381) and the lower rail (20383).

6. The automatic injection molding device for plastic parts according to claim 5, characterized in that: The processing cylinder (202) is composed of a release section (2021) and a conveying section (2022) connected together, and the diameter of the release section (2021) is greater than the diameter of the conveying section (2022); The discharge head (1051) is connected to the conveying section (2022) via a discharge pipe (1052), and a hollow screw (2031) is rotatably provided inside the release section (2021) and the conveying section (2022); The part of the reciprocating cylinder (204) arranged at the release section (2021) is provided with an air suction section (2043), and the surface of the air suction section (2043) is evenly provided with air holes. The moving rod (2075) is slidably connected to the surface of the reciprocating cylinder (204) via a circular scraper (20751).

7. The automatic injection molding device for plastic parts according to claim 5, characterized in that: The bottom of the synchronization plate (205) is fixedly connected to a fixing plate (2037), the synchronization plate (205) is fixedly connected to a clamping sleeve (2036) via the fixing plate (2037), a clamping ring (2035) is rotatably clamped inside the clamping sleeve (2036), and the clamping ring (2035) is fixedly sleeved on the surface of the rotating cylinder (203); The rotating cylinder (203) is rotatably arranged inside the conveying section (2022), and the bottom end of the rotating cylinder (203) arranged inside the conveying section (2022) is fixedly connected to a hollow screw (2031).

8. The automatic injection molding device for plastic parts according to claim 7, characterized in that: A connecting plate (2041) is fixedly connected to the opposite surface of the reciprocating cylinder (204) and the synchronous plate (205), and a second air guide pipe (10621) is conductively connected between the top of the connecting plate (2041) and the filter (1062); The connecting plate (2041) is movably connected to the conveying section (2022) and the push ring (20412) through the movable rod (20411), and a push ring (20412) is movably provided between the hollow screw (2031) and the conveying section (2022).

9. The automatic injection molding device for plastic parts according to claim 6, characterized in that: A middle sealing block (2044) is fixedly provided in the middle of the reciprocating cylinder (204), a convex head (20441) is provided at the bottom of the middle sealing block (2044), and a moving rod (2075) is movably provided in the middle of the middle sealing block (2044) and the convex head (20441); The convex head (20441) is provided with a partition rod (2045) corresponding to the surface of the reciprocating cylinder (204), and a return port (2046) is provided between adjacent partition rods (2045); a return circular plate (2076) is fixedly connected to the bottom of the moving rod (2075), and through holes are evenly provided on the surface of the return circular plate (2076); an extension ring (20761) is installed upward on the outer contour of the return circular plate (2076); The bottom of the hollow screw (2031) is fixedly connected to a plunger (2032); a sealing ring (20321) is provided on the surface of the plunger (2032); a check ring (20211) is provided inside the bottom of the release section (2021); the plunger (2032) is rotatably connected to the check ring (20211) via the sealing ring (20321); and the bottom of the release section (2021) is conductively connected to an injection head (20212).

10. The automatic injection molding device for plastic parts according to claim 5, characterized in that: The main unit (1) comprises a support frame (101), the bottom of the support frame (101) is fixedly connected to a lifting cavity (102), the bottom end of the lifting cavity (102) is fixedly connected to an auxiliary rod (1021) and a lifting drive source (1022), a movable mold (103) is slidably provided on the surface of the auxiliary rod (1021), the output shaft of the lifting drive source (1022) is fixedly connected to the middle of the bottom surface of the movable mold (103), and the top of the auxiliary rod (1021) is fixedly connected to a fixed mold (104); An air extraction member (106) is fixedly connected to the side of the support frame (101), and the air extraction member (106) is conductively connected to a filter (1062) via an air guide tube 1 (1061).

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