Feeding system with speed reducer in injection molding machine

Abstract

The feeding system with a speed reducer in the injection molding machine includes a feeding cylinder with a feed inlet at the top. A heat-insulating pipe is connected to the bottom of the feeding cylinder, and the heat-insulating pipe is connected to an injection assembly. A heating and stirring mechanism is provided in the feeding cylinder, and a switch assembly for controlling the flow of plastic fluid into the heat-insulating pipe is located at the bottom of the feeding cylinder. The injection assembly includes an injection seat, on which a fluid pump and a regulating pressure valve are sequentially arranged along the direction of plastic fluid flow, and a nozzle is provided at one end of the injection seat. A heating block is installed around the feeding cylinder and the injection seat. Compared with the prior art, this application has the following advantages: setting the stirring process inside the feeding cylinder makes the stirring more thorough, avoids insufficient stirring caused by screw problems, and improves the yield rate.

Description

Technical Field

[0001] This invention belongs to the technical field of injection molding machine feeding mechanism, specifically relating to a feeding system with a reducer in an injection molding machine. Background Technology

[0002] Injection molding machines, also known as injection molding machines or injection molding machines, are molding devices that combine the thermal processing characteristics of plastics with the die-casting principle of metals to produce various shapes of plastic products from thermoplastic or thermosetting plastics using plastic molds. The working principle of an injection molding machine is to use the thrust of a screw (or plunger) to inject pre-plasticized molten plastic (i.e., viscous flow state) into a closed mold cavity, where it solidifies and sets to obtain the finished product.

[0003] The feeding systems of current mainstream injection molding machines are mainly driven by screws, which have the following problems: 1. The screw mechanism is complex and enclosed, making cleaning and maintenance troublesome. 2. A large amount of residual material accumulates in the screw cavity, resulting in a large amount of mixed waste material during material changeovers, making the process troublesome and wasteful. 3. Due to insufficient material drying, excessively fine material, and unreasonable injection parameters, screw slippage is prone to occur, causing agitation, which severely reduces the yield rate and prolongs the molding cycle.

[0004] Therefore, based on some of the situations in the prior art described above, this application has made further designs and improvements. Summary of the Invention

[0005] To address the shortcomings of the existing technology, this invention provides a feeding system with a speed reducer for injection molding machines. The mixing process is set inside the feeding cylinder, making the mixing more thorough, avoiding insufficient mixing caused by screw problems, and improving the yield rate.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution.

[0007] A feeding system with a speed reducer for an injection molding machine includes a feeding cylinder, with a heat-insulating pipe connected to the bottom of the feeding cylinder, and an injection assembly connected to the heat-insulating pipe. The feeding cylinder is equipped with a heating and stirring mechanism, and a switching assembly for controlling the flow of plastic fluid into the heat-insulating pipe is located at the bottom of the feeding cylinder. The injection assembly includes an injection seat, on which a fluid pump and a regulating pressure valve are sequentially arranged along the direction of plastic fluid flow. A heating block is externally mounted on both the feeding cylinder and the injection seat.

[0008] In a preferred embodiment, the heating and stirring mechanism includes a stirring drum shaft and a stirring assembly disposed outside the stirring drum shaft. The stirring assembly includes an assembly ring seat and a stirring frame, and the feeding cylinder has a receiving cavity for accommodating the assembly ring seat. The assembly ring seat is provided with conductive protrusions, the stirring frame is provided with a heating module electrically connected to the conductive protrusions, and the receiving cavity is provided with a conductive ring band that abuts against the conductive protrusions.

[0009] In a preferred embodiment, the stirring rack includes an assembly plate and a scraper. The assembly plate is connected to an assembly ring seat, and the assembly plate and the scraper are connected by an elastic telescopic member. The assembly plate and the scraper are spirally arranged around the stirring cylinder axis, and the heating module is disposed within the assembly plate and the scraper.

[0010] In a preferred embodiment, the outer side of the scraper is adapted to the inner wall of the feeding cylinder, and the scraper is provided with a scraping edge. In low-speed stirring, there is a gap between the scraper and the inner wall of the feeding cylinder; in high-speed rotation, the scraper adheres to the inner wall of the feeding cylinder under the action of centrifugal force.

[0011] In a preferred embodiment, the elastic telescopic member is provided with a guide plate extending along the stirring direction.

[0012] In a preferred embodiment, the stirring drum shaft includes a stirring shaft driven by a stirring motor and a through-tube, and the assembly ring seat is provided with an outflow hole. The stirring shaft and the through-tube are connected by helical blades, and the helical blades rotate in the opposite direction to the stirring frame.

[0013] In a preferred embodiment, the bottom of the feeding cylinder is an inverted cone shape that converges towards the center.

[0014] In a preferred embodiment, the stirring motor and the stirring shaft are connected and driven by a reducer. The reducer includes a housing consisting of an upper housing and a lower housing, and a sun gear, planet gears, and a planet carrier are installed inside the housing. The sun gear is connected to an input shaft, which is connected to the stirring motor via a coupling. The planet carrier is connected to an output shaft, which is connected to the stirring shaft via a coupling.

[0015] In a preferred embodiment, the switching assembly includes several rotating plates, and the bottom of the feeding cylinder is provided with several discharge ports communicating with the insulation pipe. The rotating plates are disposed in the discharge ports; the rotating plates are driven to rotate by a switching motor.

[0016] In a preferred embodiment, the switch assembly further includes a control ring, on which a first gear ring and a second gear ring are provided. A bevel gear is connected to the rotating plate, and the bevel gear meshes with the first gear ring. The switch motor is connected to a drive gear, and the drive gear meshes with the second gear ring.

[0017] Compared with the prior art, this application has the following beneficial effects:

[0018] 1. Set the mixing process inside the feeding cylinder to make the mixing more thorough, avoid insufficient mixing caused by screw problems, and improve the yield rate.

[0019] 2. A heating and stirring mechanism is provided. The stirring component of the heating and stirring mechanism can scrape off the material adhering to the inner wall of the feeding cylinder, reduce the accumulation of material in the feeding system, and help save material.

[0020] 3. The manufacturer can clean it by disassembly, which is convenient and thorough. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of the material feeding system.

[0022] Figure 2 This is a cross-sectional view of the internal structure of the feeding system.

[0023] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle.

[0024] Figure 4 This is a partial structural diagram of the assembly of the switch assembly and the feed cylinder.

[0025] Figure 5 This is a three-dimensional schematic diagram of the heating and stirring mechanism.

[0026] Figure 6 This is a schematic diagram of the internal structure of the stirring drum shaft.

[0027] Figure 7 This is a schematic diagram of the speed reducer.

[0028] The following is an explanation of the markings in the accompanying drawings:

[0029] 1. Feeding cylinder; 11. Inlet; 12. Conductive ring belt; 13. Outlet;

[0030] 2. Mounting bracket;

[0031] 3. Insulation pipe;

[0032] 4. Heating block;

[0033] 51. Stirring drum shaft; 511. Stirring shaft; 512. Through-tube; 513. Spiral blade; 52. Stirring assembly; 521. Assembly ring seat; 522. Outlet through-hole; 523. Conductive protrusion; 524. Assembly plate; 525. Scraper; 526. Edge scraper; 527. Elastic telescopic component; 528. Guide plate; 53. Stirring motor;

[0034] 61. Rotating plate; 62. Switch motor; 63. Control ring; 631. First gear ring; 632. Second gear ring; 64. Bevel gear; 65. Drive gear;

[0035] 7. Injection seat; 71. Fluid pump; 72. Regulating pressure valve; 73. Nozzle;

[0036] 8. Reducer; 81. Upper housing; 82. Lower housing; 83. Sun gear; 84. Planet gears; 85. Planet carrier; 86. Input shaft; 87. Output shaft. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0038] In the following embodiments, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0039] In the description of this invention, it should be understood that terms such as center, longitudinal, transverse, length, width, thickness, upper, lower, front, rear, left, right, vertical, horizontal, top, bottom, inner, outer, clockwise, counterclockwise, etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing and simplifying the description of this invention; therefore, they should not be construed as limiting this invention. Furthermore, terms such as first, second, etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features shown. In the description of this invention, unless otherwise expressly specified and limited, terms such as installation, connection, linking, etc., should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] Reference Figures 1 to 7 A feeding system with a speed reducer for an injection molding machine includes a feeding cylinder 1, which is fixed to the injection molding machine via a mounting bracket 2. The feeding cylinder 1 has a feed inlet 11 at its top and an inverted cone shape at its bottom. A heat insulation pipe 3 is connected to the bottom of the feeding cylinder 1, and an injection assembly is connected to the heat insulation pipe 3. The feeding cylinder 1 contains a heating and stirring mechanism, and a switch assembly for controlling the flow of plastic fluid into the heat insulation pipe 3 is located at its bottom. The injection assembly includes an injection seat 7, on which a fluid pump 71 and a regulating pressure valve 72 are sequentially arranged along the direction of plastic fluid flow. A nozzle 73 is located at one end of the injection seat 7. A heating block 4 is externally mounted on the feeding cylinder 1 and the injection seat 7.

[0041] The working principle of this embodiment is as follows: The operator pours the material into the feeding cylinder 1. The heating and stirring mechanism and the heating block 4 located on the feeding cylinder 1 heat and melt the material and stir it. After heating is completed, the switch assembly is turned on, and the molten material enters the injection seat 7 through the heat preservation pipe 3. The heating block 4 on the injection seat 7 adjusts the temperature of the material. The fluid pump 71 pumps the material out and ejects it through the nozzle 73. The regulating pressure valve 72 adjusts the injection pressure.

[0042] As a specific embodiment, the heating and stirring mechanism has the following structure: it includes a stirring cylinder shaft 51 and a stirring assembly 52 disposed outside the stirring cylinder shaft 51. The stirring assembly 52 includes an assembly ring seat 521 and a stirring frame. The feeding cylinder 1 has a receiving cavity for accommodating the assembly ring seat 521. The assembly ring seat 521 is provided with conductive protrusions 523. The stirring frame is provided with a heating module electrically connected to the conductive protrusions 523. The receiving cavity is provided with a conductive ring band 12 that abuts against the conductive protrusions 523. The stirring frame includes an assembly plate 524 and a scraper 525. The assembly plate 524 is connected to the assembly ring seat 521, and the assembly plate 524 and the scraper 525 are connected by an elastic telescopic member 527. The assembly plate 524 and the scraper 525 are spirally arranged around the stirring cylinder shaft 51, and the heating module is disposed within the assembly plate 524 and the scraper 525.

[0043] Specifically, the outer side of the scraper 525 is adapted to the inner wall of the feeding cylinder 1, and the scraper 525 is provided with a scraping edge 526. In low-speed stirring mode, there is a gap between the scraper 525 and the inner wall of the feeding cylinder 1. In high-speed rotation mode, the scraper 525 adheres to the inner wall of the feeding cylinder 1 under the action of centrifugal force. The elastic telescopic member 527 is provided with a guide plate 528 extending along the stirring direction, which can reduce stirring resistance.

[0044] The stirring rack functions as follows: During stirring, the stirring shaft 511 rotates at a low speed. During this time, the elastic telescopic member 527 is slightly stretched due to centrifugal force, and a certain gap remains between the scraper 525 and the inner wall of the feeding cylinder 1. When the material in the feeding cylinder 1 has drained, the stirring shaft 511 switches to a high-speed rotation state. During this time, the elastic telescopic member 527 is significantly stretched due to centrifugal force, and the scraper 525 is in close contact with the inner wall of the feeding cylinder 1, scraping off the material adhering to the inner wall of the feeding cylinder 1.

[0045] The specific structure of the stirring drum shaft 51 is as follows: The stirring drum shaft 51 includes a stirring shaft 511 driven by a stirring motor 53 and a through-tube 512. An outflow hole 522 is provided on the assembly ring seat 521. The stirring shaft 511 and the through-tube 512 are connected by a spiral blade 513, which rotates in the opposite direction to the stirring frame. During stirring, the material at the bottom of the feeding cylinder 1 is lifted to the upper part of the feeding cylinder 1 by the stirring drum shaft 51 and then falls through the outflow hole 522 of the assembly ring seat 521, forming a stirring cycle and allowing for more thorough stirring. This prevents the molding quality from being affected by material quality factors such as dryness and particle size.

[0046] In one specific embodiment, the stirring motor 53 and the stirring shaft 511 are connected and driven by a reducer 8. The reducer 8 includes a housing composed of an upper housing 81 and a lower housing 82, and a sun gear 83, planet gears 84, and a planet carrier 85 are installed inside the housing. The inner wall of the housing is provided with a ring gear portion, which meshes with the planet gears 84, and the planet gears 84 mesh with the sun gear 83. The sun gear 83 is connected to an input shaft 86, which is connected to the stirring motor 53 via a coupling. The planet carrier 85 is connected to an output shaft 87, which is connected to the stirring shaft 511 via a coupling.

[0047] In one specific embodiment, the switching assembly includes several rotating plates 61, and the bottom of the feeding cylinder 1 is provided with several discharge ports 13 communicating with the insulation pipe 3. The rotating plates 61 are disposed within the discharge ports 13. The rotating plates 61 are driven to rotate by a switching motor 62. The switching assembly also includes a control ring 63, on which a first gear ring 631 and a second gear ring 632 are provided. The rotating plates 61 are connected to a bevel gear 64, which meshes with the first gear ring 631. The switching motor 62 is connected to a drive gear 65, which meshes with the second gear ring 632.

[0048] When the switch assembly is turned on, the switch motor 62 rotates, and the control ring 63 rotates, driving the rotating plate 61 to rotate, so that the feeding cylinder 1 is connected to the insulation pipe 3, allowing the material to flow into the insulation pipe 3.

[0049] Compared with the prior art, this application has the following beneficial effects:

[0050] 1. The mixing process is set inside the feeding cylinder 1 to make the mixing more thorough, avoid insufficient mixing caused by screw problems, and improve the yield rate.

[0051] 2. A heating and stirring mechanism is provided. The stirring component 52 of the heating and stirring mechanism can scrape off the material adhering to the inner wall of the feeding cylinder 1, reduce the accumulation of material in the feeding system, and help save material.

[0052] 3. The manufacturer can clean it by disassembly, which is convenient and thorough.

[0053] The scope of protection of this invention includes, but is not limited to, the above embodiments. The scope of protection of this invention is defined by the claims. Any substitutions, modifications, or improvements to this technology that are easily conceived by those skilled in the art fall within the scope of protection of this invention.

Claims

1. A feeding system with a speed reducer in an injection molding machine, characterized in that, Includes a feeding cylinder (1), with an insulation pipe (3) connected below the feeding cylinder (1), and an injection assembly connected to the insulation pipe (3); The feeding cylinder (1) is equipped with a heating and stirring mechanism, and the bottom of the feeding cylinder (1) is equipped with a switch assembly for controlling the plastic fluid to enter the heat preservation pipe (3); the injection assembly includes an injection seat (7), and the injection seat (7) is equipped with a fluid pump (71) and a regulating pressure valve (72) in sequence along the plastic fluid flow direction. The feed cylinder (1) and injection seat (7) are covered with heating blocks (4); The heating and stirring mechanism includes a stirring cylinder shaft (51) and a stirring assembly (52) disposed outside the stirring cylinder shaft (51); the stirring assembly (52) includes an assembly ring seat (521) and a stirring frame, and the feeding cylinder (1) is provided with a receiving cavity for accommodating the assembly ring seat (521); the assembly ring seat (521) is provided with a conductive protrusion (523), the stirring frame is provided with a heating module electrically connected to the conductive protrusion (523), and the receiving cavity is provided with a conductive ring band (12) abutting against the conductive protrusion (523); the stirring frame includes an assembly plate (524) and a scraper (525), the assembly plate (524) and the assembly ring seat (521) are connected to each other. 521) The assembly plate (524) and the scraper (525) are connected by an elastic telescopic member (527); the assembly plate (524) and the scraper (525) are spirally arranged around the stirring cylinder shaft (51), and the heating module is arranged inside the assembly plate (524) and the scraper (525); the outer side of the scraper (525) is adapted to the inner wall of the feeding cylinder (1), and the scraper (525) is provided with a scraping edge (526); in the low-speed stirring state, there is a gap between the scraper (525) and the inner wall of the feeding cylinder (1); in the high-speed rotation state, the scraper (525) is in contact with the inner wall of the feeding cylinder (1) under the action of centrifugal force; The bottom of the feeding cylinder (1) is an inverted cone shape that converges towards the center; the switch assembly includes several rotating plates (61), and the bottom of the feeding cylinder (1) is provided with several discharge ports (13) that communicate with the heat preservation pipe (3). The rotating plates (61) are located inside the discharge ports (13); the rotating plates (61) are driven to rotate by a switch motor (62); the switch assembly also includes a control ring (63), and the control ring (63) is provided with a first gear ring (631) and a second gear ring (632); the rotating plate (61) is connected to a bevel gear (64), and the bevel gear (64) meshes with the first gear ring (631); the switch motor (62) is connected to a drive gear (65), and the drive gear (65) meshes with the second gear ring (632).

2. The feeding system with a speed reducer in the injection molding machine according to claim 1, characterized in that, The elastic telescopic member (527) is provided with a guide plate (528) extending along the stirring direction.

3. The feeding system with a speed reducer in the injection molding machine according to claim 2, characterized in that, The stirring cylinder shaft (51) includes a stirring shaft (511) driven by a stirring motor (53) and a through cylinder (512) that passes through the middle. The assembly ring seat (521) is provided with an outflow through hole (522). The stirring shaft (511) and the through cylinder (512) are connected by a spiral blade (513), and the spiral blade (513) rotates in the opposite direction to the stirring frame.

4. The feeding system with a reducer in the injection molding machine according to claim 3, characterized in that, The stirring motor (53) and the stirring shaft (511) are connected and driven by a reducer (8); the reducer (8) includes a housing consisting of an upper housing (81) and a lower housing (82), and a sun gear (83), a planet gear (84) and a planet carrier (85) are installed inside the housing; the sun gear (83) is connected to an input shaft (86), and the input shaft (86) is connected to the stirring motor (53) through a coupling; the planet carrier (85) is connected to an output shaft (87), and the output shaft (87) is connected to the stirring shaft (511) through a coupling.

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