Screw sealing device of injection molding machine

Abstract

The utility model discloses a screw sealing device of an injection molding machine, which comprises a sol cylinder and a screw rotating in the sol cylinder, the front end of the screw is fixedly provided with a fork-type glue distributing nozzle, the fork-type glue distributing nozzle is sequentially sleeved with a first bolt rubber ring, a connecting ring, a second bolt rubber ring and a glue injection meson, and the outer side surfaces of the first bolt rubber ring and the second bolt rubber ring are in sliding contact with the inner wall of the sol cylinder. The glue injection meson is fixed at the tail end of the fork type glue distribution nozzle, a gap is reserved between the outer side face of the glue injection meson and the inner wall of the glue melting cylinder, the connecting ring is located between the first glue tying ring and the second glue tying ring, and four inserting holes are evenly formed in the two sides of the connecting ring respectively. Inserting rods movably inserted into inserting holes in the two sides of the connecting ring are fixed to the sides, close to the connecting ring, of the first bolt rubber ring and the second bolt rubber ring respectively, and springs are installed in the inserting holes. The bolt rubber ring has the advantages that abrasion of the bolt rubber ring is relieved, and the service life of the bolt rubber ring is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of plunger machines, in particular to a screw sealing device for an injection molding machine. Background Art

[0002] The screw sealing device of the injection molding machine is a key component for realizing the above-mentioned screw injection of molten plastic. At present, the common sealing devices of the injection molding machine include a fork-type dispensing nozzle, a plug rubber ring, and a glue injection meson. The principle is that when the fork-type dispensing nozzle and the glue injection meson inject the molten plastic to the front nozzle, the plug rubber ring located between the fork-type dispensing nozzle and the glue injection meson will be affected by inertia and stick to one side of the glue injection meson. Since the outer side of the plug rubber ring slides in contact with the inner wall of the sol cylinder, the plug rubber ring and the glue injection meson will block the molten plastic in front. The gap for material reflux ensures that the molten plastic in the front is smoothly injected out of the sol cylinder. At the same time, when the fork dispensing nozzle and the injection meson retreat to the rear, the plug rubber ring will be tightly attached to the head of the fork dispensing nozzle. Since the conical head of the fork dispensing nozzle has more grooves, and there is a gap between the inner side of the plug rubber ring and the outer side of the fork dispensing nozzle, the molten plastic behind the injection meson will be squeezed by the screw rotation and move to the front of the fork dispensing nozzle through the above gap and groove to prepare for subsequent injection work.

[0003] However, during the actual use of the above-mentioned injection molding machine sealing device, the fork-type glue dispensing nozzle head and the glue injection medium will continuously collide back and forth with the middle plug rubber ring. This collision will not only accelerate the sliding friction between the plug rubber ring and the sol cylinder wall, causing the plug rubber ring to wear faster, but also because the fork-type glue dispensing nozzle head has to rotate with the rear screw during the retraction process, the plug rubber ring that is in close contact with it will produce a certain relative rotation with the inner wall of the sol cylinder wall under the drive of the rotation friction of the fork-type glue dispensing nozzle head, thereby further accelerating the wear speed of the plug rubber ring and shortening the service life of the plug rubber ring. Utility Model Content

[0004] The utility model aims to provide a screw sealing device for an injection molding machine, which has the effects of slowing down the wear of the plug rubber ring and ensuring the service life of the plug rubber ring.

[0005] The cam is secured to the front of the sealant and is adapted to engage the sealant when the sealant is released, the sealant then being secured to the sealant when the sealant is released.

[0006] The present invention is further configured such that a gap is left between the outer side surface of the connecting ring and the inner wall of the sol cylinder.

[0007] The present invention is further configured as follows: the number of the jacks on both sides of the connecting ring is four respectively.

[0008] The utility model is further configured as follows: a cylindrical limit slider is fixedly provided at one end of the insertion rod, the limit slider slides in the socket, and a limit ring is fixedly provided at the opening of the socket to prevent the limit slider from sliding out of the socket, and the two ends of the spring respectively abut against one side of the limit slider and the bottom of the socket.

[0009] The present invention is further configured as follows: the jacks on both sides of the connecting ring are symmetrical to each other, and a vent communicating with the jacks on both sides is provided in the middle of the connecting ring.

[0010] The utility model is further configured as follows: a protective tube body is fixedly connected to the inner side wall of the connecting ring, and the first and second rubber rings are respectively slidably sleeved on the protective tube body, with a gap being left between the inner side surface of the protective tube body and the outer side surface of the fork-type glue dispensing nozzle.

[0011] The present invention is further configured as follows: chamfers are provided at both ends of the inner side surface of the protection tube.

[0012] The utility model is further configured as follows: one end of the inner side surface of the second plug rubber ring is provided with a second chamfer, and one end of the outer side surface of the injection meson is provided with a third chamfer parallel to the second chamfer.

[0013] The present invention is further configured as follows: a plurality of hemispherical protrusions are evenly and fixedly provided on the front end of the fork-type glue dispensing nozzle, and the top ends of the hemispherical protrusions can contact and push the plug rubber ring.

[0014] The utility model is further configured as follows: an annular wear-resistant plate contacting the hemispherical protrusion is fixedly provided on one side of the first plug rubber ring.

[0015] The beneficial effect of the present invention is as follows: by adopting the above technical solution, when the injection molding machine is performing injection, and the screw and the fork-type glue dispensing nozzle move toward the nozzle of the sol tube together, the glue-injecting meson at the tail end of the fork-type glue-injecting nozzle will hit one side of the plug rubber ring 2. Since the connecting ring and the plug rubber ring 1 will not slide immediately due to the influence of inertia, the spring in the lateral jacking hole of the connecting ring will absorb the impact kinetic energy of the plug rubber ring 2 to a certain extent through the insertion rod and the slider, and at the same time reduce the initial sliding speed of the plug rubber ring 2, thereby slowing down the wear of the plug rubber ring 2 and the sol tube wall due to sliding friction; when the injection molding machine is preparing for injection molding, and the screw and the fork-type glue dispensing nozzle are moving toward the nozzle of the sol tube together, the glue-injecting meson at the tail end of the fork-type glue dispens ... the one side of the plug rubber ring 2. When moving back together in the sol cylinder, the head of the fork-type glue dispensing nozzle will hit the plug rubber ring 1, and the spring in the socket on the other side of the connecting ring will also absorb the impact of the fork-type glue dispensing nozzle head on the plug rubber ring 1 and reduce the initial sliding speed of the plug rubber ring 1, just like the above-mentioned glue injection meson hitting the plug rubber ring 2. At the same time, the rotating fork-type glue dispensing nozzle head is in contact with the annular wear-resistant plate on one side of the plug rubber ring 1 through the hemispherical protrusion, so the contact surface and static friction between the two are extremely small, and the plug rubber ring 1 and the plug rubber ring 2 cannot be driven to rotate relative to the sol cylinder, thereby further slowing down the wear of the plug rubber ring 1 and the plug rubber ring 2, and effectively ensuring the service life of the plug rubber ring 1 and the plug rubber ring 2. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 2 is a schematic diagram of the three-dimensional structure of this embodiment;

[0018] Figure 2 Schematic diagram of the internal structure of the sol tube of this embodiment;

[0019] Figure 3 It is a structural cross-sectional view of this embodiment;

[0020] In the figure, 1. Sol cylinder; 2. Screw; 3. Fork-type glue dispensing nozzle; 31. Hemispherical protrusion; 4. Rubber plug ring 1; 41. Annular wear-resistant plate; 5. Connecting ring; 51. Plug hole; 52. Limiting ring; 53. Vent; 54. Protective tube body; 541. Chamfer 1; 6. Rubber plug ring 2; 61. Chamfer 2; 7. Glue injection nozzle; 71. Chamfer 3; 8. Insert rod; 81. Limiting slider; 9. Spring. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions of the present invention in conjunction with specific embodiments. Obviously, the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0022] Embodiment: A screw sealing device for an injection molding machine, such as Figure 1-3 As shown, it includes a sol cylinder 1, a screw 2 rotating in the sol cylinder 1, a fork-type glue nozzle 3 is fixed at the front end of the screw 2, and a plug rubber ring 4, a connecting ring 5, a plug rubber ring 2 and a glue injection meson 7 are sequentially sleeved on the fork-type glue nozzle 3. The outer side surfaces of the plug rubber ring 4 and the plug rubber ring 2 6 slide in contact with the inner wall of the sol cylinder 1, and a gap is left between the inner side surface of the two and the connecting ring 5, respectively, and the outer side surface of the fork-type glue nozzle 3. The glue injection meson 7 is fixed to the tail end of the fork-type glue nozzle 3, and the outer side surface There is a gap between the connecting ring 5 and the inner wall of the sol cylinder 1. The connecting ring 5 is located between the plug rubber ring 1 4 and the plug rubber ring 2 6, and four insertion holes 51 are evenly opened on both sides. The plug rubber ring 1 4 and the plug rubber ring 2 6 are close to the side of the connecting ring 5. There are respectively fixed with insertion rods 8 that can be movably inserted into the insertion holes 51 on both sides of the connecting ring 5. A spring 9 is installed in the insertion hole 51, and the two ends of the spring 9 respectively resist one end of the insertion rod 8 and the bottom of the hole 51. There is a gap between the outer side of the connecting ring 5 and the inner wall of the sol cylinder 1.

[0023] like Figure 3 As shown, a cylindrical limit slider 81 is fixedly provided at one end of the insertion rod 8. The limit slider 81 slides within the insertion hole 51, and a limit ring 52 is fixedly provided at the opening of the insertion hole 51 to prevent the limit slider 81 from sliding out of the insertion hole 51. The two ends of the spring 9 respectively contact one side of the limit slider 81 and the bottom of the insertion hole 51. By adopting the above-mentioned limit slider 81 and limit ring 52, it is possible to prevent the insertion rod 8 from falling out of the insertion hole 51, causing the plug rubber ring 1 4 or the plug rubber ring 2 6 to be disconnected from the connecting ring 5. Among them, the insertion holes 51 on both sides of the connecting ring 5 are symmetrical to each other, and a vent 53 is opened in the middle of the connecting ring 5 to connect the insertion holes 51 on both sides. It can maintain the air pressure balance of the insertion holes 51 on both sides of the connecting ring 5 to ensure the safe operation of the connecting ring 5.

[0024] like Figure 3As shown, a protective tube body 54 is fixedly connected to the inner side wall of the connecting ring 5. The first and second rubber rings 4 and 6 are respectively slidably mounted on the protective tube body 54. A gap is left between the inner side of the protective tube body 54 and the outer side of the forked glue dispensing nozzle 3. The two ends of the inner side of the protective tube body 54 are provided with chamfers 541. By adopting the above-mentioned protective tube body 54, not only can the outer rings of the first and second rubber rings 4 and 6 be ensured to slide stably in contact with the interior of the sol cylinder 1, but they can also cooperate with the first and second rubber rings 4 and 6 to isolate the movable space of the insertion rod 8 and the connecting ring 5 in the sol cylinder 1, thereby ensuring that the insertion rod 8 can slide stably into the socket 51 on the connecting ring 5.

[0025] like Figure 3 As shown, one end of the inner side of the plug rubber ring 2 6 is provided with a chamfer 2 61, and one end of the outer side of the injection meson 7 is provided with a chamfer 3 71 parallel to the chamfer 2 61. By adopting the above chamfer 2 61 and chamfer 3 71, the backflow of the molten plastic can be further suppressed when the plug rubber ring 2 6 and the injection meson 7 are in close contact.

[0026] like Figure 3 As shown, the front end of the forked glue dispensing nozzle 3 is evenly fixed with multiple hemispherical protrusions 31. The top of the hemispherical protrusions 31 can contact and push the plug rubber ring 4. An annular wear-resistant plate 41 is fixed to one side of the plug rubber ring 4 to contact the hemispherical protrusions 31. By using the above-mentioned hemispherical protrusions 31 and annular wear-resistant plate 41, not only can the contact area and static friction between the plug rubber ring 4 and the head of the forked glue dispensing nozzle 3 be reduced, but the wear resistance of the side of the plug rubber ring 4 can also be improved to a certain extent.

[0027] The working principle of this embodiment is as follows:

[0028] When the injection molding machine is performing injection, and the screw 2 and the fork-type glue dispensing nozzle 3 move toward the nozzle of the sol cylinder 1 together, the glue injection meson 7 at the tail end of the fork-type glue dispensing nozzle 3 will hit one side of the plug rubber ring 2 6. Since the connecting ring 5 and the plug rubber ring 1 4 will not slide immediately due to the influence of inertia, during the instantaneous impact of the plug rubber ring 2 6 by the glue injection meson 7, the spring 9 in the side socket 51 of the connecting ring 5 will absorb the impact kinetic energy of the plug rubber ring 2 6 to a certain extent through the insertion rod 8 and the slider, and at the same time reduce the initial sliding speed of the plug rubber ring 2 6, thereby slowing down the wear of the plug rubber ring 2 6 and the wall of the sol cylinder 1 sliding friction; when the injection molding machine is preparing for injection molding, and the screw 2 and the fork-type glue dispensing nozzle 3 move back together in the sol cylinder 1 The head of the fork-type glue dispensing nozzle 3 will hit the plug rubber ring 1 4, and the spring 9 in the socket 51 on the other side of the connecting ring 5 will also absorb the impact of the fork-type glue dispensing nozzle 3 head on the plug rubber ring 1 4 and reduce the initial sliding speed of the plug rubber ring 1 4, just like the above-mentioned glue injection meson 7 hitting the plug rubber ring 2 6. At the same time, the head of the rotating fork-type glue dispensing nozzle 3 is in contact with the annular wear-resistant plate 41 on one side of the plug rubber ring 1 4 through the hemispherical protrusion 31, so the contact surface and static friction between the two are extremely small, and the plug rubber ring 1 4 and the plug rubber ring 2 6 cannot be driven to rotate relative to the sol cylinder 1, thereby further slowing down the wear of the plug rubber ring 1 4 and the plug rubber ring 2 6, and effectively ensuring the service life of the plug rubber ring 1 4 and the plug rubber ring 2 6.

Claims

1. A screw sealing device for an injection molding machine, comprising a sol cylinder (1) and a screw (2) rotating in the sol cylinder (1), characterized in that: The front end of the screw (2) is fixedly provided with a fork-type glue dispensing nozzle (3), and the fork-type glue dispensing nozzle (3) is sequentially sleeved with a plug rubber ring (4), a connecting ring (5), a plug rubber ring (6) and a glue injection meson (7). The outer side surfaces of the plug rubber ring (4) and the plug rubber ring (6) are in sliding contact with the inner wall of the sol cylinder (1), and there is a gap between the inner side surface of the two and the connecting ring (5) and the outer side surface of the fork-type glue dispensing nozzle (3). The glue injection meson (7) is fixed to the tail end of the fork-type glue dispensing nozzle (3), and the outer side surface and the sol cylinder (1) are in sliding contact. A gap is left between the inner walls of the rubber cylinder (1), the connecting ring (5) is located between the first plug rubber ring (4) and the second plug rubber ring (6), and a plurality of insertion holes (51) are evenly opened on both sides. The first plug rubber ring (4) and the second plug rubber ring (6) are respectively fixed with an insertion rod (8) that can be movably inserted into the insertion holes (51) on both sides of the connecting ring (5). A spring (9) is installed in the insertion hole (51), and the two ends of the spring (9) respectively contact one end of the insertion rod (8) and the bottom of the insertion hole (51).

2. The screw sealing device for an injection molding machine according to claim 1, characterized in that: A gap is left between the outer side surface of the connecting ring (5) and the inner wall of the sol cylinder (1).

3. The screw sealing device for an injection molding machine according to claim 1, wherein: The number of the jacks (51) on both sides of the connecting ring (5) is four respectively.

4. The screw sealing device for an injection molding machine according to claim 1, wherein: A cylindrical limiting slider (81) is fixedly provided at one end of the insertion rod (8), the limiting slider (81) slides in the insertion hole (51), and a limiting ring (52) is fixedly provided at the opening of the insertion hole (51) to prevent the limiting slider (81) from sliding out of the insertion hole (51), and the two ends of the spring (9) respectively contact one side of the limiting slider (81) and the bottom of the insertion hole (51).

5. The screw sealing device for an injection molding machine according to claim 1, wherein: The insertion holes (51) on both sides of the connecting ring (5) are symmetrical to each other, and a vent (53) communicating with the insertion holes (51) on both sides is provided in the middle of the connecting ring (5).

6. The screw sealing device for an injection molding machine according to claim 1, characterized in that: The inner side wall of the connecting ring (5) is also fixedly connected with a protective tube body (54), and the first rubber ring (4) and the second rubber ring (6) are respectively slidably mounted on the protective tube body (54), and a gap is left between the inner side surface of the protective tube body (54) and the outer side surface of the fork-type glue dispensing nozzle (3).

7. The screw sealing device for an injection molding machine according to claim 6, characterized in that: Both ends of the inner side surface of the protection tube body (54) are provided with chamfers (541).

8. The screw sealing device for an injection molding machine according to claim 1, characterized in that: One end of the inner side surface of the second plug rubber ring (6) is provided with a second chamfer (61), and one end of the outer side surface of the injection meson (7) is provided with a third chamfer (71) parallel to the second chamfer (61).

9. The screw sealing device for an injection molding machine according to claim 1, characterized in that: The front end of the fork-type glue dispensing nozzle (3) is evenly and fixedly provided with a plurality of hemispherical protrusions (31), and the top ends of the hemispherical protrusions (31) can contact and push the plug rubber ring (4).

10. The screw sealing device for an injection molding machine according to claim 9, characterized in that: An annular wear-resistant plate (41) contacting the hemispherical protrusion (31) is fixedly provided on one side of the plug rubber ring (4).

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