Liquid silicone screw tube device

Abstract

The invention relates to a liquid silicone screw material pipe device, comprising a material pipe assembly, a screw assembly and a nozzle assembly, wherein the screw assembly is arranged on a material pipe body, the screw assembly comprises a screw body and a glue head, a sealing member is arranged in a sealing groove of the screw body, the rod head of the glue head comprises a seat body and a conical head which are separately arranged, the seat body comprises a blending cavity, a non-return annular portion, a first material hole and a second material hole, the feeding cavity is divided into a first feeding cavity and a second feeding cavity by the non-return annular portion, the blending cavity is divided into a first blending cavity and a second blending cavity by a sealing ring of the conical head, the first material hole is connected to the first blending cavity, the second material hole is connected to the second blending cavity, the sealing ring slides forward and backward with the conical head to make the first material hole connected to or not connected to the second blending cavity, and the injection flow channel of the nozzle assembly is connected to the second feeding cavity; the mixing uniformity of the raw materials is improved, and the amount of the raw materials can be controlled for mixing, thereby improving the mixing accuracy and the subsequent injection molding quality.

Description

Technical Field

[0001] The invention relates to the technical field of material pipes, in particular to a liquid silicone screw material pipe device. Background Art

[0002] At present, the silicone molding process generally uses a material tube, a nozzle arranged at the front end of the material tube, and a screw installed in the material tube. The material tube generally has a feeding cavity that runs through the front and back, and the front and rear ends of the feeding cavity form a feed inlet and a discharge port respectively, and the screw extends into the feeding cavity from the feed inlet. The existing screw and the screw head are an integrated structure, and it is difficult to blend the raw materials at the screw head, which affects the quality of subsequent injection molding. In addition, the existing screw and the material tube have poor sealing performance, which is easy to leak from the screw inlet during the injection molding process, resulting in a waste of raw materials.

[0003] Therefore, in the patent application of the present invention, the applicant carefully studied a liquid silicone screw material tube device to solve the above problems. Summary of the invention

[0004] The present invention aims to overcome the deficiencies in the above-mentioned prior art and aims to provide a liquid silicone screw material pipe device, which enables the raw materials to be blended in the blending chamber, improves the mixing uniformity of the raw materials, and can also control the amount of raw materials for mixing, thereby improving the mixing accuracy and subsequent injection molding quality.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme:

[0006] A liquid silicone screw material tube device, comprising a material tube assembly, a screw assembly and a nozzle assembly, wherein:

[0007] The material pipe assembly includes a material pipe body, and a feed port connected to a feeding cavity is concavely arranged on the outer periphery of the rear section of the material pipe body; the material pipe body has a feeding cavity that passes through the interior of the material pipe body from front to back, and the feeding cavity is respectively formed with a corresponding discharge port and a screw insertion port at the front and rear ends of the material pipe body;

[0008] The screw assembly is arranged on the material pipe body, and the screw assembly includes a screw body and a glue head; the glue head includes a rod head and a rod shaft detachably connected to the screw body, the rod head includes a seat body and a conical head which are separately arranged, the seat body is integrally connected to the rod shaft, the seat body has a blending cavity with a front end opening, a non-return annular portion sealingly connected to the inner side wall of the feeding cavity, and a first material hole and a second material hole arranged on the outer periphery of the seat body, the feeding cavity is divided into a first feeding cavity and a second feeding cavity by the non-return annular portion, the first material hole is connected to the first feeding cavity and the blending cavity respectively, and the second material hole is connected to the second feeding cavity and the blending cavity respectively;

[0009] The rear end of the conical head is convexly provided with a connecting portion, and the rear end of the connecting portion is integrally extended vertically outward to form a sealing ring. The conical head is slidably installed in the blending cavity from the front end opening along the front and rear directions, and the inner wall of the blending cavity is formed with a stopper, and the conical head travels between the stopper and the rear end wall of the blending cavity; the sealing ring is sealed and connected to the inner side wall of the blending cavity, and the blending cavity is divided into a first blending cavity and a second blending cavity by the sealing ring, the first material hole is connected to the first blending cavity, and the second material hole is connected to the second blending cavity, and the sealing ring slides forward and backward with the conical head to make the first material hole connected to or not connected to the second blending cavity;

[0010] The nozzle assembly is connected to the material pipe body, and the nozzle assembly has an ejection flow channel and an injection flow channel connected to the ejection flow channel, and the injection flow channel is connected to the second feeding cavity.

[0011] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, the present invention mainly divides the rod head of the glue head into a seat body and a conical head slidably installed in the blending cavity of the seat body. The blending cavity of the seat body is divided into a first blending cavity and a second blending cavity by a sealing ring of the conical head. The sealing ring slides forward and backward with the conical head to make the first feeding cavity connected or not connected to the second blending cavity. Through the design of the sealing ring and the blending cavity, on the one hand, the raw materials can be blended in the blending cavity, thereby improving the mixing uniformity of the raw materials. On the other hand, the amount of raw materials can be controlled for mixing, thereby improving the mixing accuracy and subsequent injection molding quality.

[0012] In order to more clearly illustrate the structural features and effects of the present invention, it is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of the present invention;

[0014] Figure 2 It is a partial decomposition structure schematic diagram of an embodiment of the present invention;

[0015] Figure 3 It is a schematic diagram of a partial first cross-sectional structure of an embodiment of the present invention;

[0016] Figure 4 is a partial second cross-sectional structural schematic diagram of an embodiment of the present invention;

[0017] Figure 5 It is a schematic diagram of the decomposition structure of the laminating head according to an embodiment of the present invention;

[0018] Figure 6 2. It is a schematic diagram of the three-dimensional assembly structure of the nozzle assembly according to an embodiment of the present invention;

[0019] Figure 7It is a schematic diagram of the three-dimensional assembly structure of the nozzle assembly of an embodiment of the present invention from another angle;

[0020] Figure 8 1 is a schematic diagram of a first exploded structure of a nozzle assembly according to an embodiment of the present invention;

[0021] Fig. 9 is a second exploded structural schematic diagram of the nozzle assembly according to an embodiment of the present invention;

[0022] Fig.10 is a schematic diagram of the cross-sectional structure of a nozzle assembly according to an embodiment of the present invention;

[0023] Fig.11 is a schematic cross-sectional structural diagram of a nozzle assembly according to another embodiment of the present invention;

[0024] Fig.12 It is a schematic diagram of the three-dimensional assembly structure of the material tube assembly of an embodiment of the present invention;

[0025] Fig.13 It is a schematic diagram of the main structure of the material pipe according to an embodiment of the present invention;

[0026] Fig.14 It is a schematic diagram of the three-dimensional assembly structure of a material tube assembly according to another embodiment of the present invention;

[0027] Fig.15 yes Fig.14 Schematic diagram of the cross-section structure (mounting nuts not shown);

[0028] Fig.16 yes Fig.15 Enlarged structural diagram at A in the middle. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] like Figures 1 to 16 As shown, a liquid silicone screw material tube device, which is mainly used for liquid silicone injection molding, includes a material tube assembly, a screw assembly and a nozzle assembly, wherein:

[0031] exist Figures 12 to 16 In the embodiment, the material pipe assembly includes a material pipe body 40, a heat-conducting ring sleeve 50 and an auxiliary cooling unit. The material pipe body 40 has a feeding cavity 41 that passes through the interior of the material pipe body 40 from front to back. The feeding cavity 41 is formed with corresponding discharge ports 411 and screw inlets 412 at the front and rear ends of the material pipe body 40, respectively.

[0032] The outer periphery of the rear section of the material tube body 40 is recessed with a feed port 43 connected to the feeding cavity 41. In this embodiment, a clearance groove 42 is opened on the side of the rear section of the material tube body 40, and the feed port 43 is recessed inward from the inner wall surface of the clearance groove 42.

[0033] The outer circumference of the material tube body 40 is spirally provided with a first spiral groove 44 along the circumferential direction of the feeding cavity 41, and the first spiral groove 44 is located at the front side of the feed port 43; in this embodiment, the front end surface of the material tube body 40 is recessed with a plurality of screw holes 45, and the screw holes 45 are evenly spaced along the circumferential direction on the outer circumference of the discharge port 411, and are connected to the nozzle assembly through the screw holes 45.

[0034] A second shaft-shaped protrusion 46 is extended from the rear end of the material tube body 40. The diameter of the second shaft-shaped protrusion 46 is smaller than that of the material tube body 40. The feeding cavity 41 extends backward to the rear end surface of the second shaft-shaped protrusion 46. The rear section of the second shaft-shaped protrusion 46 is detachably connected with a mounting nut 461. Preferably, the mounting nut 461 is threadedly connected to the second shaft-shaped protrusion 46. A pin mounting hole 462 is recessed on the outer peripheral side of the front end of the second shaft-shaped protrusion 46. The pin mounting hole 462 does not penetrate the inner wall surface of the material tube body 40. The pin mounting hole 462 and the feed port 43 are located on opposite sides. A pin 463 is installed at the pin mounting hole 462. A first annular groove 464 is recessed on the outer peripheral of the front end of the second shaft-shaped protrusion 46. A second annular groove 47 is recessed forward on the rear end surface of the material tube body 40. The second annular groove 47 is arranged around the second shaft-shaped protrusion 46. The second annular groove 47 is connected to the first annular groove 464.

[0035] In another embodiment, the heat-conducting ring sleeve 50 is made of metal, preferably copper. Fig.14 and Fig.15 In the embodiment, a plurality of heat dissipation fins 51 are fixedly connected to the outer peripheral wall of the heat-conducting ring sleeve 50, and reinforcing ribs 52 are arranged between adjacent heat-dissipating fins 51. The heat of the material tube body 40 will be conducted to the inner wall of the heat-conducting ring sleeve 50, and then the heat-conducting ring sleeve 50 will be conducted to the heat-dissipating fins 51, and the heat-dissipating fins 51 will dissipate the heat into the surrounding air. Since the heat-dissipating fins 51 are extremely thin and have a large contact area with the air, the overall heat dissipation area of ​​the heat-conducting ring sleeve 50 can be increased, and the cooling effect of the heat-conducting ring sleeve 50 can be improved. Since reinforcing ribs 52 are arranged between the heat-dissipating fins 51, the overall heat dissipation area of ​​the heat-conducting ring sleeve 50 can be increased, and the cooling performance of the heat-conducting ring sleeve 50 can be further improved, and the heat conduction efficiency can be enhanced. At the same time, since the reinforcing ribs 52 and the heat-dissipating fins 51 are fixedly connected, the structural strength of the heat-conducting ring sleeve 50 can be effectively strengthened, and local deformation and damage of the heat-conducting ring sleeve 50 will not occur during use, thereby improving the strength of the heat-conducting ring sleeve 50, thereby ensuring that it can be used multiple times and for a long time.

[0036] The heat-conducting ring sleeve 50 sealing sleeve is arranged on the outer periphery of the front side of the feed port 43 of the material pipe body 40, and the sealing cavity between the inner wall of the heat-conducting ring sleeve 50 and the first spiral groove 44 forms a first cooling spiral water channel 53. The heat-conducting ring sleeve 50 is provided with a first coolant inlet 54 and a first coolant outlet 55, and the first coolant inlet 54 and the first coolant outlet 55 are both connected to the first cooling spiral water channel 53. Preferably, the first coolant inlet 54 and the first coolant outlet 55 are located on the same side, and a filter fixing frame 541 is arranged at the first coolant inlet 54, and a filter layer 542 is arranged on the filter fixing frame 541. The material of the filter layer 542 is not limited, such as an activated carbon layer, and can be selected and replaced according to actual needs. Through the filter layer 542, impurities in the first cooling spiral water channel 53 can be effectively removed to a certain extent to avoid clogging of the first cooling spiral water channel 53.

[0037] The auxiliary cooling unit includes a bendable spiral cooling pipe 61, which extends along the spiral direction of the first spiral groove 44 and is adapted to the first cooling spiral water channel 53. The material pipe body 40 is provided with a second coolant inlet 48 and a second coolant outlet 49. The two ends of the spiral cooling pipe 61 are respectively connected to the second coolant inlet 48 and the second coolant outlet 49. The water flow direction in the spiral cooling pipe 61 is opposite to the water flow direction in the first cooling spiral water channel 53. Preferably, the first spiral groove 44 is located between the second coolant inlet 48 and the second coolant outlet 49, the second coolant inlet 48 and the second coolant outlet 49 are located on the same side, the first coolant inlet 54 and the second coolant inlet 48 are arranged diagonally, and the first coolant outlet 55 and the second coolant outlet 49 are arranged diagonally.

[0038] Preferably, the second coolant inlet 48 and the second coolant outlet 49 are both L-shaped hollow structures, and the L-shaped hollow structure has a transverse hollow portion 491 and a vertical hollow portion 492 which is integrally and vertically connected and connected to the transverse hollow portion 491. The vertical hollow portions 492 of the second coolant inlet 48 and the second coolant outlet 49 are both connected to the outside, and the transverse hollow portions 491 of the second coolant inlet 48 and the second coolant outlet 49 are both connected to the first spiral groove 44. The two ends of the spiral cooling tube 61 are respectively extended into the corresponding transverse hollow portions 491, and then the outer peripheries of the two ends of the spiral cooling tube 61 are sealed and fixed to the inner walls of the corresponding transverse hollow portions 491 to avoid the transverse hollow portion 491 from connecting to the first spiral groove 44. Therefore, the coolant delivered from the second coolant inlet 48 can only flow into the spiral cooling tube 61 and can only flow out from the second coolant outlet 49.

[0039] exist Figures 1 to 5In the embodiment, the screw assembly is arranged on the material pipe body 40, and the screw assembly includes a screw body 70 and a glue head 80. The screw body 70 includes a feeding section 71, a sealing groove 72 and a transmission key groove 73 from front to back, and the outer circumferential surface of the feeding section 71 is provided with spiral feeding teeth along its length direction. The feeding section 71 is connected to the glue head 80, and the screw assembly is installed in the feeding cavity 41 from the screw introduction port 412, and the glue head 80 and the transmission key groove 73 are respectively exposed outside the material pipe body 40. A sealing member 721 is provided in the sealing groove 72, and the sealing groove 72 is located at the rear side of the feeding port 411, and the sealing member 721 is sealed and connected with the inner side wall of the feeding cavity 41;

[0040] The glue head 80 includes a rod head 81 and a rod shaft 801 detachably connected to the feeding section 71, the rod head 81 includes a seat body 82 and a conical head 83 which are separately arranged, the seat body 82 is integrally connected to the rod shaft 801, the seat body 82 has a blending cavity with a front end opening, a non-return ring portion 823 which is sealed and connected to the inner wall of the feeding cavity 41, and a first material hole 824 and a second material hole 825 which are arranged on the outer periphery of the seat body 82, the feeding cavity 41 is divided into a first feeding cavity 413 and a second feeding cavity 414 by the non-return ring portion 823, the rear end of the nozzle assembly is connected to the material pipe body 40, the nozzle assembly has an injection channel 13 and an injection channel 21 connected to the injection channel 13, the injection channel 21 is arranged toward the discharge port 411, and the injection channel 21 is connected to the second feeding cavity 414. The first material holes 824 are respectively connected to the first feeding chamber 413 and the blending chamber, and the second material holes 825 are respectively connected to the second feeding chamber 414 and the blending chamber; preferably, the first material holes 824 are arranged tilted outward from front to back, and the second material holes 825 are arranged tilted inward from front to back.

[0041] The rear end of the conical head 83 is provided with a connecting portion 831, and the rear end of the connecting portion 831 is integrally extended vertically outward to form a sealing ring 832. The outer diameter of the connecting portion 831 is smaller than the outer diameter of the sealing ring 832 so that a gap is formed between the connecting portion 831 and the blending cavity. The conical head 83 is installed in the blending chamber by sliding along the front-back direction from the front end opening, and a stopper 826 is formed on the inner wall of the blending chamber. The conical head 83 travels between the stopper 826 and the rear end wall of the blending chamber, and the sealing ring 832 is sealed and connected to the inner side wall of the blending chamber. The blending chamber is divided into a first blending chamber 821 and a second blending chamber 822 by the sealing ring 832. The first material hole 824 is connected to the first blending chamber 821, and the second material hole 825 is connected to the second blending chamber 822. The sealing ring 832 slides forward and backward with the conical head 83 to make the first material hole 824 connected to or not connected to the second blending chamber 822; preferably, a conical groove 827 is recessed backward on the inner wall of the rear end of the first blending chamber 821, and the first material hole 824 is connected to the conical groove 827.

[0042] Next, we will briefly explain the working principle of the glue head 80:

[0043] When the screw body 70 moves forward, the seat body 82 also moves forward, and the conical head 83, the connecting portion 831 and the sealing ring 832 slide toward the conical groove 827 together until the rear end of the sealing ring 832 abuts against the inner wall of the conical groove 827. At this time, the first material hole 824 is connected to the second blending chamber 822.

[0044] Next, by rotating the screw body 70, the raw materials in the first feeding cavity 413 are blended along the feeding section 71 of the screw body 70 from the first material hole 824 into the second blending cavity 822;

[0045] Then, when the screw body 70 is moved backward, the seat body 82 also moves backward, and the conical head 83, the connecting part 831 and the sealing ring 832 slide together toward the conical groove 827 until the front end of the sealing ring 832 contacts the stop part 826. At this time, the first material hole 824 is not connected to the second blending chamber 822, and the raw material in the second blending chamber 822 enters the second feeding chamber 414 from the second material hole 825.

[0046] Preferably, the rod head 81 also includes a limiting column 84, and a limiting column mounting hole 841 is also opened on the outer periphery of the seat body 82, and the limiting column mounting hole 841 is respectively connected to the second feeding cavity 414 and the second blending cavity 822, and the limiting column 84 is installed in the limiting column mounting hole 841 and one end of the limiting column 84 extends into the second blending cavity 822 to form a stop portion 826.

[0047] In this embodiment, Figures 6 to 9 as well as Fig.11 In the embodiment, the nozzle assembly is a pneumatic nozzle assembly, which includes a nozzle body 10, a sealing body 30, a cylinder 20 detachably connected to the nozzle body 10, and a nozzle sleeve 18 having a hollow cavity;

[0048] The nozzle body 10 has two first branch channels 11, two first cooling channels 12 and a nozzle hole 15 for injecting liquid silicone. The two first cooling channels 12 are respectively arranged on both sides of the injection channel 13. The injection channel 13 runs through the nozzle body 10 from front to back. The two first branch channels 11 are respectively arranged on both sides of the injection channel 13. The front end of each first branch channel 11 is connected to the injection channel 13. The injection channel 13 extends forward and passes through the nozzle hole 15.

[0049] The cylinder 20 has two second branch channels 22, a piston chamber 23 with an opening at the front end, a water inlet 24, a water outlet 25, a second cooling channel 26 and a third cooling channel 27; the injection channel 21 is arranged on the cylinder 20, and the injection channel 21 is respectively connected to the two second branch channels 22, and each second branch channel 22 is connected to the rear end of a corresponding first branch channel 11; a filter screen installation groove 28 is formed at the connection point between each second branch channel 22 and a first branch channel 11, and a filter screen 281 is installed in the filter screen installation groove 28.

[0050] The sealant body 30 includes a sealant valve core 31 and a stopper 32 disposed at the front end opening of the piston chamber 23. The stopper 32 is provided with a through hole 321 that penetrates the interior of the stopper 32 from front to back. The sealant valve core 31 is installed in the piston chamber 23 and the front end of the sealant valve core 31 extends into the injection flow channel 13 from the through hole 321. Under the action of the gas source, the sealant valve core 31 moves forward and backward in the piston chamber 23 relative to the stopper 32 and the rear end inner wall of the piston chamber 23 to open or close the nozzle hole 15. By controlling the distance that the sealant valve core 31 moves forward, the injection amount injected at the nozzle hole 15 is controlled. Preferably, a first driving hole 202 and a second driving hole 203 are provided on the side wall of the cylinder 20, and the first driving hole 202 and the second driving hole 203 are both connected to the piston chamber 23. A pressure gas source is filled into the piston chamber 23 through the first driving hole 202 or the second driving hole 203 to drive the sealing valve core 31 to move forward and backward to open or close the nozzle hole 15 for glue injection.

[0051] In this embodiment, the two first branch channels 11 intersect each other in a V shape, and the intersection of the two first branch channels 11 is located on the axis of the ejection channel 13. Preferably, each second branch channel 22 includes a transverse channel 221 extending from front to back and an oblique channel 222 connected to the rear end of the transverse channel 221, each transverse channel 221 is parallel to the axis of the ejection channel 13, the front end of each transverse channel 221 is connected to a corresponding first branch channel 11, and the rear end of each oblique channel 222 is connected to the injection channel 21. The two oblique channels 222 intersect each other in a V shape, and the intersection of the two oblique channels 222 is located on the axis of the injection channel 21. The angle between the two oblique channels 222 is greater than the angle between the two first branch channels 11; all transverse channels 221, the second cooling channel 26 and the third cooling channel 27 are parallel to each other.

[0052] A truncated cone groove 14 is formed at the front end of the injection channel 13, and the truncated cone groove 14 is connected to the nozzle hole 15. A truncated cone portion 311 is formed at the front end of the sealing valve core 31. The angle of the truncated cone portion 411 forms a thrust angle of 1 degree with the truncated cone groove 14. A column portion 312 is integrally protruded forward at the front end of the truncated cone portion 311, and the outer diameter of the column portion 312 is smaller than the outer diameter of the truncated cone portion 311. The column portion 412 extends into or exits the nozzle hole 15 as the sealing valve core 31 moves forward and backward, and after the column portion 312 extends into the nozzle hole 15, a gap is maintained with the nozzle hole 15 so that the liquid silicone can be sequentially delivered from the injection channel 13, the thrust angle and the nozzle hole 15. The flow direction of the liquid silicone is roughly: from the injection channel 21, the oblique channel 222, the transverse channel 221, the first branch channel 11, the injection channel 13, the truncated cone groove 14 and the nozzle hole 15 in sequence.

[0053] The front end surface of the nozzle body 10 is convexly provided with a first axial protrusion 101, the diameter of the first axial protrusion 101 is smaller than the nozzle body 10, the nozzle hole 15 is arranged at the front end of the first axial protrusion 101, and the nozzle sleeve 18 is sealed and sleeved on the first axial protrusion 101;

[0054] The outer circumference of the first axial protrusion 101 is spirally provided with a second spiral groove 131 along the circumferential direction of the ejection channel 13. The sealed cavity between the inner wall of the nozzle sleeve 18 and the second spiral groove 131 forms a second cooling spiral water channel 19. One end of all first cooling channels 12 is connected to the second cooling spiral water channel 19. The water inlet 24 is connected to any first cooling channel 12 through the second cooling channel 26. The water outlet 25 is connected to another first cooling channel 12 through the third cooling channel 27. The water inlet 24 and the water outlet 25 are both located on the same side of the cylinder 20. In this embodiment, the two first cooling channels 12 intersect each other in a V shape, and the intersection of the two first cooling channels 12 is located on the axis of the ejection channel 13.

[0055] The front end of the nozzle body 10 is provided with an R angle that matches the injection port of the mold; the rear end of the nozzle body 10 is integrally provided with a first mounting groove 16, and the front end wall of the first mounting groove 16 is integrally provided with a second mounting groove 17, the second mounting groove 17 is connected to the injection channel 13, and a protective sleeve 33 is sleeved on the outer peripheral wall of the sealing valve core 31 extending out of the through hole 421, the protective sleeve 33 is installed in the second mounting groove 17, and a gasket 34 is installed in the first mounting groove 16, and the gasket 34 is clamped between the protective sleeve 33 and the cylinder 20.

[0056] The cylinder 20 is an aluminum alloy cylinder 20, which is much lighter and easier to install. The aluminum alloy has a high thermal conductivity, and when cooled by the coolant in the spiral metal heat pipe 29, the heat dissipation effect can be greatly enhanced. Fig.10 In another embodiment, the outer peripheral side of the aluminum alloy cylinder 20 is provided with a spiral metal heat dissipation pipe 29 filled with coolant, and the spiral metal heat dissipation pipe 29 has a liquid inlet and a liquid outlet. The melting point of the material of the spiral metal heat dissipation pipe 29 is greater than the melting point of the material of the cylinder 20. Preferably, the material of the spiral metal heat dissipation pipe 29 is a metal or alloy with strong thermal conductivity, such as iron, nickel-based alloy, etc.

[0057] The rear end surface of the cylinder 20 is concavely provided with a groove 201, and correspondingly, the front end of the material pipe body 40 is convexly provided with a third shaft-shaped protrusion 401, the outer diameter of which is smaller than the outer diameter of the material pipe body 20, and the third shaft-shaped protrusion 401 is adapted to fit in the groove 201. The front end wall of the groove 201 is concavely provided to form an injection flow channel 21, and a conical flow guide port 211 is formed at the front end of the injection flow channel 21, and the oblique flow channel 222 of each second branch flow channel 22 is connected to the conical flow guide port 211, and the outer diameter of the conical flow guide port 211 gradually increases from front to back.

[0058] The key points of the design of the present invention are that the rod head of the glue head is divided into a seat body and a conical head slidably mounted in the blending cavity of the seat body, the blending cavity of the seat body is divided into a first blending cavity and a second blending cavity by a sealing ring of the conical head, the sealing ring slides forward and backward with the conical head to make the first feeding cavity connected or disconnected with the second blending cavity, through the design of the sealing ring and the blending cavity, on the one hand, the raw materials can be blended in the blending cavity, improving the mixing uniformity of the raw materials, and on the other hand, the amount of the raw materials can be controlled for mixing, improving the mixing accuracy and the subsequent injection molding quality;

[0059] Moreover, a seal is arranged in the sealing groove, which has a good sealing effect, thereby preventing the raw material from leaking from the screw inlet during the injection molding process, thereby reducing the waste of raw materials;

[0060] Secondly, a first cooling spiral water channel is formed by a sealed cavity between the inner wall of the heat-conducting ring sleeve and the first spiral groove of the material pipe body, and a spiral cooling pipe with a water flow direction opposite to the water flow direction in the first cooling spiral water channel is arranged in the first cooling spiral water channel, which can effectively cool the spiral fluidity in the first cooling spiral water channel, and the cooling is more sufficient, thereby improving the cooling effect on the material pipe body; and, in combination with the heat dissipation fins and reinforcing ribs on the heat-conducting ring sleeve, the overall heat dissipation area of ​​the heat-conducting ring sleeve is increased, especially, the overall combination of water cooling and heat conduction ensures a better cooling effect on the material pipe body and ensures that the product after injection molding meets the required requirements;

[0061] Furthermore, by setting the first branch channel and the second branch channel between the injection channel and the injection channel, it is beneficial to divert the liquid silicone in the injection channel to avoid blocking the injection channel and improve the fluidity of the liquid silicone; at the same time, through the thrust angle formed between the angle of the truncated cone portion and the truncated cone groove, the column body is extended into the nozzle hole and maintains a gap with the nozzle hole, so that the injection volume can be accurately controlled to ensure the stability and reliability of the injection. Moreover, the cylinder and the nozzle body are detachably connected, which is convenient for assembly and maintenance, and different nozzle bodies can be replaced as needed to control different injection volumes;

[0062] Furthermore, by cooperating with the cooling spiral water channel, the first cooling channel, the second cooling channel and the third cooling channel, the cooling effect of the cylinder and the nozzle body is improved, and the service life of the cylinder and the nozzle body is extended.

[0063] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A liquid silicone screw tube device, characterized in that: It includes a material tube assembly, a screw assembly and a nozzle assembly, wherein: The material pipe assembly includes a material pipe body, and a feed port connected to a feeding cavity is concavely arranged on the outer periphery of the rear section of the material pipe body; the material pipe body has a feeding cavity that passes through the interior of the material pipe body from front to back, and the feeding cavity is respectively formed with a corresponding discharge port and a screw insertion port at the front and rear ends of the material pipe body; The screw assembly is arranged on the material pipe body, and the screw assembly includes a screw body and a glue head; the glue head includes a rod head and a rod shaft detachably connected to the screw body, the rod head includes a seat body and a conical head which are separately arranged, the seat body is integrally connected to the rod shaft, the seat body has a blending cavity with a front end opening, a non-return annular portion sealingly connected to the inner side wall of the feeding cavity, and a first material hole and a second material hole arranged on the outer periphery of the seat body, the feeding cavity is divided into a first feeding cavity and a second feeding cavity by the non-return annular portion, the first material hole is connected to the first feeding cavity and the blending cavity respectively, and the second material hole is connected to the second feeding cavity and the blending cavity respectively; The rear end of the conical head is convexly provided with a connecting portion, and the rear end of the connecting portion is integrally extended vertically outward to form a sealing ring. The conical head is slidably installed in the blending cavity from the front end opening along the front and rear directions, and the inner wall of the blending cavity is formed with a stopper, and the conical head travels between the stopper and the rear end wall of the blending cavity; the sealing ring is sealed and connected to the inner side wall of the blending cavity, and the blending cavity is divided into a first blending cavity and a second blending cavity by the sealing ring, the first material hole is connected to the first blending cavity, and the second material hole is connected to the second blending cavity, and the sealing ring slides forward and backward with the conical head to make the first material hole connected to or not connected to the second blending cavity; The nozzle assembly is connected to the material pipe body, and the nozzle assembly has an ejection flow channel and an injection flow channel connected to the ejection flow channel, and the injection flow channel is connected to the second feeding cavity.

2. A liquid silicone screw material tube device according to claim 1, characterized in that: The screw body includes a feeding section, a sealing groove and a transmission key groove from front to back, the feeding section is connected to the rod shaft, the screw assembly is installed in the feeding cavity from the screw introduction port, the glue head and the transmission key groove are respectively exposed outside the material pipe body, a sealing member is provided in the sealing groove, the sealing groove is located at the rear side of the feed port, and the sealing member is sealed and connected to the inner wall of the feeding cavity.

3. A liquid silicone screw material tube device according to claim 1, characterized in that: The rod head also includes a limiting column, and a limiting column mounting hole is also provided on the outer periphery of the seat body. The limiting column mounting holes are respectively connected to the feeding cavity and the blending cavity. The limiting column is installed in the limiting column mounting hole and one end of the limiting column extends into the blending cavity to form a stopper.

4. A liquid silicone screw material tube device according to claim 1, characterized in that: A conical groove is concavely formed on the inner wall of the rear end of the first blending cavity, and the first material hole is connected to the conical groove.

5. A liquid silicone screw material tube device according to claim 1, characterized in that: The material pipe assembly also includes a heat-conducting ring sleeve and an auxiliary cooling unit; The outer circumference of the material pipe body is spirally provided with a first spiral groove along the circumferential direction of the feeding cavity, and the first spiral groove is located at the front side of the feeding port; The heat-conducting ring sleeve sealing sleeve is arranged on the outer periphery of the front side of the feed port of the material pipe body, and the sealing cavity between the inner wall of the heat-conducting ring sleeve and the first spiral groove forms a first cooling spiral water channel. The heat-conducting ring sleeve is provided with a first coolant inlet and a first coolant outlet, and the first coolant inlet and the first coolant outlet are both connected to the first cooling spiral water channel; The auxiliary cooling unit includes a bendable spiral cooling pipe, which extends along the spiral direction of the first spiral groove and is adapted to the first cooling spiral water channel. A second coolant inlet and a second coolant outlet are provided on the material pipe body. Both ends of the spiral cooling pipe are respectively connected to the second coolant inlet and the second coolant outlet. The water flow direction in the spiral cooling pipe is opposite to the water flow direction in the first cooling spiral water channel.

6. A liquid silicone screw material tube device according to claim 5, characterized in that: A plurality of heat dissipation fins are fixedly connected to the outer peripheral wall of the heat-conducting ring sleeve, and reinforcing ribs are arranged between adjacent heat dissipation fins.

7. A liquid silicone screw-barrel device according to claim 1, characterized in that: The nozzle assembly is a pneumatic nozzle assembly, and the pneumatic nozzle assembly includes a nozzle body, a sealing body, and a cylinder detachably connected to the nozzle body; The nozzle body has two first branch channels and a nozzle hole for injecting liquid silicone, the injection channel runs through the nozzle body from front to back, the two first branch channels are respectively arranged on both sides of the injection channel, the front end of each first branch channel is connected to the injection channel, and the injection channel extends forward and passes through the nozzle hole; The cylinder has two second flow channels and a piston chamber with an opening at the front end; the injection flow channel is arranged on the cylinder, and the injection flow channel is connected to the two second flow channels respectively, and each second flow channel is connected to the rear end of a corresponding first flow channel; The glue sealing body includes a glue sealing valve core and a stopper arranged at the front end opening of the piston chamber. The stopper is provided with a through hole that passes through the interior of the stopper front and back. The glue sealing valve core is installed in the piston chamber and the front end of the glue sealing valve core extends into the injection channel from the through hole. Under the action of the air source, the glue sealing valve core can move forward and backward in the piston chamber relative to the stopper and the rear end inner wall of the piston chamber to open or close the nozzle hole.

8. A liquid silicone screw-barrel device according to claim 7, characterized in that: A filter installation groove is formed at the connection point between each second branch flow channel and a first branch flow channel, and a filter is installed in the filter installation groove.

9. A liquid silicone screw-barrel device according to claim 7, characterized in that: A truncated cone groove is formed at the front end of the injection channel, and the truncated cone groove is connected to the nozzle hole. A truncated cone portion is formed at the front end of the sealing valve core, and a thrust angle of 1 degree is formed between the angle of the truncated cone portion and the truncated cone groove. A column portion is integrally protruded forward at the front end of the truncated cone portion, and the column portion extends into or exits the nozzle hole as the sealing valve core moves forward and backward. After the column portion extends into the nozzle hole, a gap is maintained with the nozzle hole so that the liquid silicone can be sequentially delivered from the injection channel, the thrust angle, the gap and the nozzle hole.

10. A liquid silicone screw-barrel device according to claim 7, characterized in that: It also includes a nozzle sleeve having a hollow cavity, the nozzle body also has two first cooling channels, the two first cooling channels are respectively arranged on both sides of the ejection flow channel, and the cylinder also has a water inlet, a water outlet, a second cooling channel and a third cooling channel; The front end surface of the nozzle body is convexly provided with a first axial convex portion, the diameter of the first axial convex portion is smaller than the nozzle body, the nozzle hole is arranged at the front end of the first axial convex portion, and the nozzle sleeve sealing sleeve is arranged on the first axial convex portion; A second spiral groove is spirally arranged on the outer periphery of the first axial protrusion along the circumferential direction of the injection channel, and a second cooling spiral water channel is formed in the sealed cavity between the inner wall of the nozzle sleeve and the second spiral groove. One end of all the first cooling channels is connected to the second cooling spiral water channel, the water inlet is connected to any second cooling channel through the second cooling channel, and the water outlet is connected to another first cooling channel through the third cooling channel.

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