CN218948284U

CN218948284U - Single-point needle valve type liquid silica gel cold nozzle

Info

Publication number: CN218948284U
Application number: CN202223191446.6U
Authority: CN
Inventors: 杨秀成; 林长跃
Original assignee: Zhuhai Hanwei Injection Technology Co ltd
Current assignee: Zhuhai Hanwei Injection Technology Co ltd
Priority date: 2022-11-28
Filing date: 2022-11-28
Publication date: 2023-05-02
Anticipated expiration: 2032-11-28

Abstract

The utility model discloses a single-point needle valve type liquid silica gel cold nozzle capable of shortening an injection molding period and improving injection molding efficiency, which comprises a cold nozzle body, a valve needle arranged in the cold nozzle body and a cylinder for driving the valve needle, wherein the cold nozzle body, the valve needle and the cylinder are coaxially arranged, a split fluid is arranged between the cylinder and the cold nozzle body, a flow channel is arranged in the center of the cold nozzle body, a double spiral groove is arranged on the side wall of the cold nozzle body, a body jacket is sleeved on the outer wall of the cold nozzle body, a cooling cavity is formed between the double spiral groove and the body jacket, a dish-shaped elastic sheet is arranged at the joint of the cold nozzle body and the split fluid, the lower end of the cold nozzle body is connected with a flange, a heat insulation cap is connected with an injection molding port communicated with the flow channel, the head end of the valve needle penetrates through the split fluid to be connected with a piston in the cylinder, the tail end penetrates through the injection molding port, and the valve needle is driven by the cylinder to realize injection molding in the flow channel.

Description

Single-point needle valve type liquid silica gel cold nozzle

Technical Field

The utility model relates to the field of cold runner molds, in particular to a single-point needle valve type liquid silica gel cold nozzle.

Background

The silica gel is a thermosetting material, is in a liquid state at low temperature and becomes a solid state at normal temperature, so that the common plastic product is molded by heating the plastic product into molten plastic by using a hot runner system, then injecting the molten plastic into a mold cavity for cooling molding, and the silica gel product is realized by using a cold runner cold nozzle. The cold nozzle is used for guiding the liquid of the cold runner, the cold runner comprises an open cold nozzle and a needle valve cold nozzle, and the needle valve cold nozzle can control the fusion position of plastics, so that the product has better appearance and molding quality, and the consistency of the product is improved.

The patent document with publication number CN216465936U discloses a cold nozzle structure for cold runner silica gel, which comprises a cold nozzle body, a nozzle head and a valve needle, wherein the nozzle head is arranged in the bottom end of the cold nozzle body and extends downwards out of the cold nozzle body, and the valve needle is arranged in the cold nozzle body and extends downwards out of the nozzle head; the cold mouth body comprises an outer cold mouth body and an inner cold mouth body, wherein the inner cold mouth body is arranged in the outer cold mouth body, and a water tank for cooling liquid to circulate is arranged between the inner cold mouth body and the outer cold mouth body.

The utility model can ensure that the silica gel is not solidified due to the temperature rise when flowing through the cold nozzle body, but when the cold nozzle is used for injection molding of the mold, the high temperature on the mold can be transferred to the cold nozzle, and the glue is easy to solidify, thereby influencing the glue outlet, the low temperature of the cold nozzle is conducted on the mold, influencing the molding cycle of the mold, the valve needle is easy to insert and damage the gate of the mold when in feeding movement, the appearance of the gate and the service life of the mold are influenced, and the problems that the mold is damaged due to non-concentricity when the valve needle moves are difficult to be avoided after long-term use.

Disclosure of Invention

The utility model aims to solve the technical problem of overcoming the defects of the prior art and providing a single-point needle valve type liquid silica gel cold nozzle which shortens the injection molding period and improves the injection molding efficiency.

The technical scheme of the utility model is as follows: the utility model provides a cold mouth of single-point needle valve formula liquid silica gel, is including cold mouth body, setting are in cold needle and the drive of mouth body inside needle and the cylinder of needle, the cylinder with be provided with the branch fluid between the cold mouth body, needle and the coaxial setting of cylinder, cold mouth body center is provided with the runner, is provided with double helix groove on the lateral wall, and the cover is equipped with the body overcoat on the outer wall, double helix groove with form the cooling chamber between the body overcoat, cold mouth body with branch fluid junction is provided with dish shell fragment, cold mouth body lower extreme is connected with the flange, be connected with the heat-proof cap on the flange, the heat-proof cap tip be provided with the mouth of moulding plastics of runner intercommunication, the head end of needle wear divide the fluid with piston connection in the cylinder, the tail end is passed the mouth of moulding plastics stretches out, the drive of cylinder is in the runner through feeding motion realization injection moulding plastics.

According to the scheme, when the valve needle moves upwards under the driving of the air cylinder, the liquid silica gel flows out of the injection port from the runner to complete injection; the valve needle stretches out downwards to block up the mouth of moulding plastics, stops moulding plastics, the cooling chamber is used for loading as the coolant liquid, and double helix groove spiral circulation fortune water does benefit to the flow of water for the water flows more evenly, and the cold effect of chewing of cooling is good, ensures that the silica gel can not be because of the temperature rise solidification when flowing through the cold body of chewing that makes the sizing material flow stable smooth and easy, when cold chewing moulding plastics, the heat-proof cap can avoid cold heat conduction between body and the mould of chewing, prevents that the high temperature conduction on the mould from leading to gluing solidification and influencing out the glue on cold chewing, avoids cold low temperature conduction of chewing simultaneously on the mould, influences the molding cycle of mould, the dish shell fragment lets cold body of chewing have certain elasticity activity space, effectively reduces machining error and the phenomenon of leaking glue appears.

The split body comprises an upper split body and a lower split body, the upper split body is connected with the lower split body through a first anti-rotation pin, the air cylinder is connected to the top of the upper split plate, and the cold nozzle body is connected to the bottom of the lower split body. It can be seen that the first anti-rotation pin is used for connecting the upper split flow body and the lower split flow body, and prevents the rotation of the valve needle between the upper split flow body and the lower split flow body caused by the movement of the cold nozzle body from affecting the accuracy of the feeding movement of the valve needle.

The upper end of the cylinder is connected with an SR head, the end part of the SR head is provided with a glue injection port communicated with the runner, and the cylinder is connected with the SR head through a second anti-rotation pin. Therefore, the rotation of the air cylinder during the movement of the valve needle can be effectively avoided, and the liquid silica gel enters the flow channel from the gel injection port.

The upper fluid separating device is characterized in that a valve needle sleeve is arranged at the joint of the upper fluid separating device and the valve needle, and RPS double-purpose seals are arranged on two end faces of the valve needle sleeve. Therefore, the two double seals are used for the RPS double-purpose sealing, so that the RPS double-purpose sealing is not easy to leak glue, and is more durable.

The cold nozzle body is provided with a valve needle guide ring between the valve needle and the flange. Therefore, the valve needle guide ring plays a role in positioning the valve needle, ensures that the valve needle is concentric with the mold gate during feeding movement, and prevents the non-concentric valve needle from damaging the mold gate by inserting, thereby influencing the appearance of the mold gate and the service life of the mold.

The cold mouth body and the split body junction are provided with dish-shaped shrapnel, the cold mouth body is gone up to overlap and is equipped with the body overcoat, the body overcoat with the split body passes through the second and prevents the rotary pin to be connected. Therefore, the dish-shaped elastic sheet enables the cold nozzle body to have a certain elastic movement space, and the phenomenon of glue leakage caused by machining errors is effectively reduced.

A piston positioning block is arranged between the piston and the upper split flow body, and a piston sealing ring is arranged on the piston. It follows that the piston positioning block and the piston sealing ring are used for sealing and positioning the piston.

The inner wall of the heat insulation cap is provided with a buckling groove, and the heat insulation cap is connected with the flange through the buckling groove. Therefore, the buckling groove can effectively buckle the heat insulation cap, and is convenient to install and maintain.

The cold nozzle body is provided with a special-shaped sealing ring groove at the joint of the cold nozzle body and the flange. Therefore, the special-shaped sealing ring is enabled to be pressed to be loose and have a good sealing effect, and the sealing ring is not easy to damage and is durable.

And a gap exists between the valve needle and the injection molding opening. Therefore, the gap is used for preventing the valve needle from moving irregularly due to machining errors, but the gap is not too large, the residual glue thickness is affected by the too large gap, the solidification is caused by the high temperature of the die, and the valve needle sealing is affected.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic view of the internal structure of the present utility model;

fig. 3 is a schematic view of the internal structure of the present utility model.

Detailed Description

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.

As shown in fig. 1 to 3, the utility model discloses a single-point needle valve type liquid silica gel cold nozzle, which comprises a cold nozzle body 1, a valve needle 2 arranged in the cold nozzle body 1 and a cylinder 3 for driving the valve needle 2, wherein a split fluid 4 is arranged between the cylinder 3 and the cold nozzle body 1, the valve needle 2 and the cylinder 3 are coaxially arranged, a flow passage 101 is arranged in the center of the cold nozzle body 1, a double spiral groove 102 is arranged on the side wall, a body jacket 5 is sleeved on the outer wall, a cooling cavity is formed between the double spiral groove 102 and the body jacket 5, a butterfly-shaped elastic sheet 6 is arranged between the cold nozzle body 1 and the split fluid 4, a flange 7 is connected at the lower end of the cold nozzle body 1, a special-shaped sealing ring groove 12 is arranged between the valve needle 3 and the flange 7, a heat insulation cap 8 is connected to the flange 7, a buckling groove 82 is arranged on the inner wall of the heat insulation cap 8, a sealing ring 92 is arranged between the heat insulation cap 82 and the piston 8 and the piston rod through the piston ring 9, the piston rod is connected with the piston rod through the piston ring 9 in an injection molding way, the piston 81 is arranged at the end of the piston ring 9, the piston rod is connected with the piston rod through the split sealing ring 9, the piston ring 81 is connected with the piston ring 1 through the split sealing ring, the piston ring 81 through the sealing ring 9, both of them are a combination seal of an O-ring and a polytetrafluoroethylene ring. The actuation of the valve needle 2 in the cylinder 3 effects injection molding by a feed motion in the flow channel 11.

The split body 4 comprises an upper split body 41 and a lower split body 42, the upper split body 41 and the lower split body 42 are connected through a first anti-rotation pin 43, the air cylinder 3 is connected to the top of the upper split body 41, the body outer sleeve 5 is connected to the bottom of the lower split body 42, the upper split body 41 is provided with a valve needle sleeve 21 at the joint of the upper split body 41 and the valve needle 2, and two end faces of the valve needle sleeve 21 are respectively provided with an RPS double-purpose seal 22.

The upper end of the cylinder 3 is connected with an SR head 10, the end part of the SR head 10 is provided with a glue injection port 103 communicated with the runner 101 and used for feeding glue, and the cylinder 3 is connected with the SR head 10 through a second anti-rotation pin 31.

In this embodiment, a liquid inlet pipe 104 for feeding cooling liquid and a liquid outlet pipe 105 for discharging cooling liquid, which are communicated with the cooling cavity, are provided in the present utility model.

The working flow of the utility model is as follows: liquid silica gel flows into the runner 101 from the glue injection port 103, water flows in through the liquid inlet pipeline 104, along with the circulation of the double-spiral groove 102, the cooling cavity between the cold nozzle body 1 and the body jacket 5 is filled, the water flows out from the liquid outlet pipeline 105, the double-spiral groove 102 ensures that water transportation is even, when any one end of the air cylinder 3 is in air, due to pressure difference, the piston 9 in the air cylinder 3 can move up and down, the valve needle 3 moves up along with the piston 9 when the piston 9 moves up, silica gel in the runner 101 flows out from the injection port 81 for injection molding, the valve needle 3 moves down along with the piston 9 when the piston 9 blocks the injection port 81, the circulation of the liquid silica gel is cut off, and injection molding is stopped. The needle valve type glue breaking is adopted in the utility model, which is beneficial to product molding, and the glue injection is accurate and the glue breaking is clean.

Finally, it should be emphasized that the above description is not intended to limit the utility model, but rather that various changes and modifications can be made by those skilled in the art without departing from the spirit and principles of the utility model, and any modifications, equivalents, improvements, etc. are intended to be included within the scope of the present utility model.

Claims

1. A single-point needle valve type liquid silica gel cold nozzle is characterized in that: including cold body (1), setting are in valve needle (2) and the drive in cold body (1) are chewed cylinder (3) of valve needle (2), cold body (1), valve needle (2) and cylinder (3) coaxial setting of chewing, cylinder (3) with be provided with branch fluid (4) between cold body (1), the center that cold body (1) was chewed is provided with runner (101), is provided with double helix groove (102) on the lateral wall, and the cover is equipped with body overcoat (5) on the outer wall, double helix groove (102) with form the cooling chamber between body overcoat (5), cold body (1) with be provided with dish shell fragment (6) between branch fluid (4), the lower extreme that cold body (1) was chewed is connected with flange (7), be connected with on flange (7) and excessively insulate against heat cap (8) tip be provided with runner (81) of moulding plastics, wear fluid (4) and tail end (3) in the lateral wall are equipped with body overcoat (5), the valve needle (3) are stretched out through injection molding (81) in the motion is realized to seal the valve needle (3) in the runner (101).

2. The single point needle valve type liquid silica gel cold nozzle according to claim 1, wherein: the split flow body (4) comprises an upper split flow body (41) and a lower split flow body (42), the upper split flow body (41) and the lower split flow body (42) are connected through a first anti-rotation pin (43), the air cylinder (3) is connected to the top of the upper split flow body (41), and the body jacket (5) is connected to the bottom of the lower split flow body (42).

3. The single point needle valve type liquid silica gel cold nozzle according to claim 1, wherein: the upper end of the cylinder (3) is connected with an SR head (10), the end part of the SR head (10) is provided with a glue injection port (103) communicated with the runner (101), and the cylinder (3) is connected with the SR head (10) through a second anti-rotation pin (31).

4. The single point needle valve type liquid silica gel cold nozzle according to claim 2, wherein: the upper fluid separating device is characterized in that a valve needle sleeve (21) is arranged at the joint of the upper fluid separating device and the valve needle (2), and RPS double-purpose seals (22) are arranged on two end faces of the valve needle sleeve (21).

5. The single point needle valve type liquid silica gel cold nozzle according to claim 1, wherein: the cold nozzle body (1) is provided with a valve needle guide ring (11) between the valve needle (2) and the flange (7).

6. The single point needle valve type liquid silica gel cold nozzle according to claim 2, wherein: a piston positioning block (91) is arranged between the piston (9) and the upper split flow body (41), and a piston sealing ring (92) is arranged on the piston (9).

7. The single point needle valve type liquid silica gel cold nozzle according to claim 1, wherein: the inner wall of the heat insulation cap (8) is provided with a buckling groove (82), and the heat insulation cap (8) is connected with the flange (7) through the buckling groove (82).

8. The single point needle valve type liquid silica gel cold nozzle according to claim 1, wherein: the cold nozzle body (1) is provided with a special-shaped sealing ring groove (12) at the joint of the cold nozzle body and the flange (7).

9. The single point needle valve type liquid silica gel cold nozzle according to claim 1, wherein: a gap (83) exists between the valve needle (2) and the injection molding opening (81).