Cold flow sleeve needle valve guiding device of liquid silicone mold and liquid silicone mold

Abstract

The utility model discloses a liquid silicone rubber mould cold flow sleeve needle valve guiding device and a liquid silicone rubber mould, which comprise a cold flow outer sleeve, a cold flow inner sleeve, a cold flow sleeve nozzle, a needle valve, a piston and a guiding component, a first flow channel and a second flow channel which are through and communicated in the axial direction are formed in the cold flow inner sleeve and the cold flow sleeve nozzle respectively, the needle valve is movably inserted into the first flow channel and the second flow channel, a mounting groove is formed in the head end of the cold flow inner sleeve, and the guide assembly is arranged at the connecting position of the cold flow sleeve nozzle and the mounting groove. The guide assembly comprises a nozzle head butterfly-shaped gasket, a first sealing ring and a valve needle guide sleeve, and the valve needle guide sleeve is of a hollow structure. According to the utility model, the guide component is additionally arranged in the cold flow sleeve of the mold and plays a role in guiding and positioning, so that the needle valve can be prevented from swinging and deviating, the needle valve can be effectively prevented from swinging to accelerate the abrasion of the needle valve and the mold core hole, the service lives of the needle valve and the front mold core are prolonged, and the product quality is also ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid silicone mold cold flow sleeves, and more specifically, to a liquid silicone mold cold flow sleeve needle valve guide device and a liquid silicone mold. Background Art

[0002] With the continuous development of industrial manufacturing, injection molding technology has become a very important production method in industrial production. It has the advantages of fast production speed, high efficiency, and precise size, and is widely used in the molding production of liquid silicone. In the existing liquid silicone mold injection molding production line, the injection of the injection molding machine is started, and the injection rubber is injected into the mold cavity through the opening of the cold flow sleeve valve needle. When the injection is completed and the action stops, the needle valve of the cold flow sleeve is closed, and the solidification molding and demolding are completed to complete a cycle of product production. However, the needle valve of the cold flow sleeve is easy to swing and deviate during movement, which will cause friction with the inclined wall of the mold core injection hole, which is easy to cause the mold core hole and the front end of the needle valve to wear too quickly, resulting in depressions and burrs on the sealing surface of the product injection gate, resulting in uneven sealing surface of the product, reducing product quality, and reducing the service life of the needle valve and mold core hole. Utility Model Content

[0003] The utility model aims to overcome the above-mentioned defects in the prior art and to provide a liquid silicone mold cold flow sleeve needle valve guide device and a liquid silicone mold, which can play a guiding and positioning role by adding a guide component inside the mold cold flow sleeve, prevent the needle valve from swinging, improve the front end deviation of the needle valve, and effectively prevent the swing of the front end of the needle valve from accelerating the wear of the needle valve and the mold core hole.

[0004] To achieve the above-mentioned purpose, the first aspect of the utility model provides a liquid silicone mold cold flow sleeve needle valve guide device, comprising a cold flow outer sleeve, a cold flow inner sleeve, a cold flow sleeve nozzle, a needle valve, a piston and a guide assembly, wherein the cold flow outer sleeve is sleeved on the outside of the cold flow inner sleeve, and the cold flow sleeve nozzle is installed at the head end of the cold flow inner sleeve, and a first flow channel is provided inside the cold flow inner sleeve that runs through the cold flow inner sleeve along its axial direction, and a second flow channel is provided inside the cold flow sleeve nozzle that runs through the cold flow inner sleeve along its axial direction, the first flow channel and the second flow channel are connected, the needle valve is movably inserted in the first flow channel and the second flow channel, the rear end of the needle valve extends out of the cold flow outer sleeve and is fixedly connected to the piston, and a mounting groove is provided at the head end of the cold flow inner sleeve The guide assembly is arranged at the connection position between the cold flow sleeve nozzle and the mounting groove. The cold flow sleeve nozzle includes an integrally formed nozzle barrel and a nozzle cone sleeve. The guide assembly includes a nozzle butterfly gasket, a first sealing ring and a valve needle guide sleeve. The valve needle guide sleeve is arranged as a hollow structure. The valve needle guide sleeve is sleeved on the outer wall of the needle valve and contacts with the inner wall of the mounting groove and is located between the top surface of the nozzle barrel and the inner end surface of the mounting groove. A first annular groove is recessed on the outer wall of the nozzle barrel. The first sealing ring is sleeved on the first annular groove and contacts with the inner wall of the mounting groove. The nozzle butterfly gasket is sleeved on the nozzle barrel and is located between the top surface of the nozzle cone sleeve and the bottom surface of the cold flow sleeve.

[0005] Preferably, a through hole for the needle valve to pass through is formed in the middle of the valve needle guide sleeve, and arc-shaped holes symmetrically arranged with the through hole as the center and opening inwards are formed on both sides of the valve needle guide sleeve.

[0006] Preferably, the first sealing ring is fitted with the inner wall of the mounting groove in an interference fit manner, and the nozzle barrel is inserted into the mounting groove and sealedly connected with the mounting groove through the first sealing ring.

[0007] Preferably, the cold flow inner sleeve and the cold flow outer sleeve are connected by welding.

[0008] Preferably, a third flow channel is provided between the inner wall of the cold flow outer sleeve and the outer wall of the cold flow inner sleeve, and flow channel holes communicating with the third flow channel are provided on both sides of the outer wall of the cold flow outer sleeve.

[0009] Preferably, it also includes a second sealing ring and a third sealing ring, a second annular groove is opened on the outer wall of the cold flow jacket above the two flow holes, the second sealing ring is sleeved on the second annular groove, and the third sealing ring is sleeved on the outer wall of the cold flow jacket and located below the two flow holes.

[0010] The second aspect of the utility model provides a liquid silicone mold, including a mold body, a liquid silicone mold cold flow sleeve needle valve guide device is installed inside the mold body, the mold body includes a rear mold core, a front mold core, a heating plate, an insulation plate, a cooling water circuit plate, a glue diverter plate and a cylinder piston plate, and the cylinder piston plate, the glue diverter plate, the cooling water circuit plate, the insulation plate, the heating plate, the front mold core and the rear mold core are connected in sequence from top to bottom.

[0011] Preferably, a piston accommodating groove for movable installation of the piston is provided inside the cylinder piston plate, two air channels connecting the two ends of the piston accommodating groove are provided on the cylinder piston plate, a glue flow channel connecting the first flow channel of the cold flow inner sleeve is provided on the glue flow diversion plate, and the two side walls of the cooling water circuit plate are connected with flow channel holes connecting the two cold flow outer sleeves and cooling water pipes of the third flow channel, two hot runners are provided inside the heating plate, and the pointed tip of the needle valve can pass through the nozzle of the cold flow sleeve and be inserted into the mold core hole of the front mold core, thereby blocking the mold core hole and realizing needle sealing.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The utility model has a simple structure and a reasonable design. The installation and coordination between the liquid silicone mold cold flow sleeve needle valve guide device and the various plates of the liquid silicone mold are simple. By adding a guide component inside the mold cold flow sleeve, the guide component can play a guiding and positioning role, which is used to prevent the needle valve from swinging and improve the front end deviation of the needle valve, effectively preventing the swing of the front end of the needle valve from accelerating the wear of the needle valve and the mold core hole, extending the service life of the needle valve and the front mold core, making the sealing surface of the product smooth to avoid dents and burrs, and ensuring product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 This is a structural schematic diagram of a liquid silicone mold cold flow sleeve needle valve guide device provided in Example 1 of the utility model;

[0016] Figure 2 It is a cross-sectional schematic diagram of a liquid silicone mold cold flow sleeve needle valve guide device provided in the first embodiment of the utility model;

[0017] Figure 3It is a partially enlarged schematic diagram of a liquid silicone mold cold flow sleeve needle valve guide device provided in the first embodiment of the utility model;

[0018] Figure 4 It is an enlarged cross-sectional schematic diagram of a liquid silicone mold cold flow sleeve needle valve guide device provided in the first embodiment of the utility model;

[0019] Figure 5 It is a structural schematic diagram of a valve needle guide sleeve of a liquid silicone mold cold flow sleeve needle valve guide device provided in Example 1 of the utility model;

[0020] Figure 6 It is a schematic cross-sectional assembly diagram of a liquid silicone mold and a liquid silicone mold cold flow sleeve needle valve guide device provided in the second embodiment of the present utility model. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Embodiment 1

[0023] Please refer to Figure 1 Embodiment 1 of the present utility model provides a liquid silicone mold cold flow sleeve needle valve guide device, including a cold flow outer sleeve 1, a cold flow inner sleeve 2, a cold flow sleeve nozzle 3, a needle valve 4, a piston 5 and a guide assembly. The various components of this embodiment are described in detail below in conjunction with the accompanying drawings.

[0024] like Figure 1 and Figure 2 As shown, the cold flow outer sleeve 1 can be sleeved on the outside of the cold flow inner sleeve 2, the cold flow sleeve nozzle 3 is installed at the head end of the cold flow inner sleeve 2, the cold flow inner sleeve 2 is provided with a first flow channel 21 running through it along its axial direction, the cold flow sleeve nozzle 3 is provided with a second flow channel 31 running through it along its axial direction, the first flow channel 21 and the second flow channel 31 are connected, the needle valve 4 is movably inserted in the first flow channel 21 and the second flow channel 31, the rear end of the needle valve 4 extends out of the cold flow outer sleeve 1 and is fixedly connected to the piston 5, the head end of the cold flow inner sleeve 2 is provided with a mounting groove 22, the guide assembly is arranged at the connecting portion of the cold flow sleeve nozzle 3 and the mounting groove 22, and the cold flow sleeve nozzle 3 includes an integrally formed nozzle barrel 32 and a nozzle cone sleeve 33.

[0025] Preferably, the cold flow inner sleeve 2 and the cold flow outer sleeve 1 can be connected by welding, and the cold flow inner sleeve 2 and the cold flow outer sleeve 1 can be made of stainless steel.

[0026] like Figure 3 and Figure 4 As shown, the guide assembly may include a nozzle butterfly gasket 61, a first sealing ring 62 and a valve needle guide sleeve 63. The valve needle guide sleeve 63 is arranged as a hollow structure. The valve needle guide sleeve 63 is sleeved on the outer wall of the needle valve 4 and contacts with the inner wall of the mounting groove 22 and is located between the top surface of the nozzle cylinder 32 and the inner end surface of the mounting groove 22. A first annular groove 321 is recessed on the outer wall of the nozzle cylinder 32. The first sealing ring 62 is sleeved on the first annular groove 321 and contacts with the inner wall of the mounting groove 22. The nozzle butterfly gasket 61 is sleeved on the nozzle cylinder 32 and is located between the top surface of the nozzle cone sleeve 33 and the bottom surface of the cold flow jacket 1.

[0027] Among them, the nozzle butterfly gasket 61 is provided with two and stacked layers to provide additional support and sealing effect, and the valve needle guide sleeve 63 is used to guide and position the front end of the needle valve 4, ensuring that it moves in the correct axial direction in the second flow channel 31, preventing it from swinging left and right, improving the front end deviation of the needle valve 4, thereby slowing down the excessive wear of the needle valve 4 and the mold core hole.

[0028] In the first embodiment, the first sealing ring 62 and the inner wall of the mounting groove 22 may be fitted in an interference fit, and the nozzle barrel 32 is inserted into the mounting groove 22 and sealedly connected with the mounting groove 22 through the first sealing ring 62 .

[0029] like Figure 5 As shown, a through hole 631 for the needle valve 4 to pass through may be provided in the middle of the valve needle guide sleeve 63, and arc holes 632 symmetrically arranged with the through hole 631 as the center and opening inward are provided on both sides of the valve needle guide sleeve 63. The diameter of the through hole 631 is Φ1.98±0.02mm, the wall thickness between the inner wall of the arc hole 632 and the outer wall of the valve needle guide sleeve 63 is preferably set to 0.35±0.05mm, and the maximum width between the two arc holes 632 is 4.98±0.015mm.

[0030] Preferably, a third flow channel 11 may be provided between the inner wall of the cold flow jacket 1 and the outer wall of the cold flow inner jacket 2, and flow channel holes 12 connected to the third flow channel 11 are provided on both sides of the outer wall of the cold flow jacket 1. The third flow channel 11 may be a cooling water flow channel, and the two flow channel holes 12 may be respectively set as the water inlet and the water outlet of the cooling water flow channel. The cooling water flow channel forms a swirling water channel between the inner wall of the cold flow jacket 1 and the outer wall of the cold flow inner jacket 2, thereby ensuring balanced cooling of the cold flow jacket as a whole and enabling the rubber material to flow stably and smoothly.

[0031] Furthermore, in order to prevent cooling water leakage, a second sealing ring 7 and a third sealing ring 8 may also be included. A second annular groove 13 is opened on the outer wall of the cold flow jacket 1 above the two flow holes 12, and the second sealing ring 7 is sleeved on the second annular groove 13. The third sealing ring 8 is sleeved on the outer wall of the cold flow jacket 1 and located below the two flow holes 12.

[0032] Embodiment 2

[0033] The second embodiment of the present utility model provides a liquid silicone mold, including a mold body 9, and the liquid silicone mold cold flow sleeve needle valve guide device of the first embodiment is installed inside the mold body 9. Among them, the liquid silicone mold cold flow sleeve needle valve guide device in the second embodiment has the same structure as the first embodiment, and will not be repeated here.

[0034] In the second embodiment, the mold body 9 may include a rear mold core 91, a front mold core 92, a heating plate 93, an insulation plate 94, a cooling water circuit plate 95, a glue diverter plate 96 and a cylinder piston plate 97. The cylinder piston plate 97, the glue diverter plate 96, the cooling water circuit plate 95, the insulation plate 94, the heating plate 93, the front mold core 92 and the rear mold core 91 are connected in sequence from top to bottom.

[0035] Furthermore, a piston accommodating groove 971 for movable installation of the piston 5 may be provided inside the cylinder piston plate 97, two air channels 972 connecting the two ends of the piston accommodating groove 971 are provided on the cylinder piston plate 97, a glue flow channel 961 connecting the first flow channel 21 of the cold flow inner sleeve 2 is provided on the glue diverter plate 96, and cooling water pipes 951 connecting the flow channel holes 12 and the third flow channel 11 of the two cold flow outer sleeves 1 are connected to the two side walls of the cooling water circuit plate 95, and two hot runners 931 are provided inside the heating plate 93, and the tip of the needle valve 4 can pass through the cold flow sleeve nozzle 3 and be inserted into the mold core hole 921 of the front mold core 92, thereby blocking the mold core hole 921 to achieve needle sealing.

[0036] The heat insulation plate 94 can isolate the heat conduction between the cooling water channel plate 95 and the heating plate 93, thereby ensuring the stable glue discharge of the cold flow sleeve nozzle 3 and ensuring the temperature of the mold body 9, thereby improving the product quality.

[0037] In a specific implementation, the cold flow jacket 1 can be used as an outer protective shell, connected to the two cooling water pipes 951, and the cooling water is passed between the cold flow jacket 1 and the cold flow inner jacket 2 to provide a cooling effect, thereby adjusting or maintaining the temperature of the cold flow inner and outer jackets. The cold flow inner jacket 2 can be connected to the glue flow channel 961, and ensure that the glue passes through the glue flow channel 961 of the glue diverter plate 96, the first flow channel 21, the second flow channel 11 and the mold core hole 921 between the front mold core 92 and the rear mold core 91 in sequence. When the needle valve 4 is not inserted into the mold core hole 921 of the front mold core 92, it finally enters into the product, thereby realizing glue injection. When the needle valve 4 moves so that its pointed tip passes through the cold flow sleeve nozzle 3 and is inserted into the mold core hole 921 of the front mold core 92, the pointed tip of the needle valve 4 can block the mold core hole 921, so that the glue cannot pass through, thereby realizing needle sealing. Among them, the valve needle guide sleeve 63 is used to guide and position the front end of the needle valve 4, effectively preventing the front end of the needle valve 4 from swinging and accelerating the wear of the mold core hole 921.

[0038] To sum up, the installation and coordination between the liquid silicone mold cold flow sleeve needle valve guide device of the utility model and the various plates of the liquid silicone mold are simple, and by adding a guide component inside the mold cold flow sleeve, the guide component can play a guiding and positioning role, which is used to prevent the needle valve from swinging and improve the front end deviation of the needle valve, effectively preventing the swing of the front end of the needle valve from accelerating the wear of the needle valve and the mold core hole, extending the service life of the needle valve and the front mold core, and can make the sealing surface of the product smooth to avoid dents and burrs, thereby ensuring product quality.

[0039] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principle of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A liquid silicone mold cold flow sleeve needle valve guide device, characterized in that: The invention comprises a cold flow outer sleeve (1), a cold flow inner sleeve (2), a cold flow sleeve nozzle (3), a needle valve (4), a piston (5) and a guide assembly. The cold flow outer sleeve (1) is sleeved on the outside of the cold flow inner sleeve (2), the cold flow sleeve nozzle (3) is installed at the head end of the cold flow inner sleeve (2), a first flow channel (21) is provided inside the cold flow inner sleeve (2) and is passed through along its axial direction, a second flow channel (31) is provided inside the cold flow sleeve nozzle (3) and is passed through along its axial direction, the first flow channel (21) and the second flow channel (31) are connected, the needle valve (4) is movably inserted in the first flow channel (21) and the second flow channel (31), the rear end of the needle valve (4) protrudes from the cold flow outer sleeve (1) and is fixedly connected to the piston (5), the head end of the cold flow inner sleeve (2) is provided with a mounting groove (22), and the guide assembly is arranged between the cold flow sleeve nozzle (3) and the mounting groove (22). At the connection part, the cold flow sleeve nozzle (3) includes an integrally formed nozzle barrel (32) and a nozzle cone sleeve (33), the guide assembly includes a nozzle butterfly gasket (61), a first sealing ring (62) and a valve needle guide sleeve (63), the valve needle guide sleeve (63) is arranged as a hollow structure, the valve needle guide sleeve (63) is sleeved on the outer wall of the needle valve (4) and contacts the inner wall of the mounting groove (22) and is located between the top surface of the nozzle barrel (32) and the inner end surface of the mounting groove (22), a first annular groove (321) is recessed on the outer wall of the nozzle barrel (32), the first sealing ring (62) is sleeved on the first annular groove (321) and contacts the inner wall of the mounting groove (22), the nozzle butterfly gasket (61) is sleeved on the nozzle barrel (32) and is located between the top surface of the nozzle cone sleeve (33) and the bottom surface of the cold flow sleeve (1).

2. A liquid silicone mold cold flow sleeve needle valve guide device according to claim 1, characterized in that: A through hole (631) for the needle valve (4) to pass through is formed in the middle of the valve needle guide sleeve (63), and arc-shaped holes (632) symmetrically arranged with the through hole (631) as the center and opening inwards are formed on both sides of the valve needle guide sleeve (63).

3. A liquid silicone mold cold flow sleeve needle valve guide device according to claim 1, characterized in that: The first sealing ring (62) and the inner wall of the mounting groove (22) are fitted in an interference fit manner, and the nozzle barrel (32) is inserted into the mounting groove (22) and is sealedly connected to the mounting groove (22) through the first sealing ring (62).

4. A liquid silicone mold cold flow sleeve needle valve guide device according to claim 1, characterized in that: The cold flow inner sleeve (2) and the cold flow outer sleeve (1) are connected by welding.

5. A liquid silicone mold cold flow sleeve needle valve guide device according to claim 1, characterized in that: A third flow channel (11) is provided between the inner wall of the cold flow outer sleeve (1) and the outer wall of the cold flow inner sleeve (2), and flow channel holes (12) communicating with the third flow channel (11) are provided on both sides of the outer wall of the cold flow outer sleeve (1).

6. A liquid silicone mold cold flow sleeve needle valve guide device according to claim 1, characterized in that: It also includes a second sealing ring (7) and a third sealing ring (8); a second annular groove (13) is provided on the outer wall of the cold flow jacket (1) above the two flow channel holes (12); the second sealing ring (7) is sleeved on the second annular groove (13); and the third sealing ring (8) is sleeved on the outer wall of the cold flow jacket (1) and below the two flow channel holes (12).

7. A liquid silicone mold, characterized in that: The invention comprises a mold body (9), wherein the liquid silicone mold cold flow sleeve needle valve guide device according to any one of claims 1 to 6 is installed inside the mold body (9), and the mold body (9) comprises a rear mold core (91), a front mold core (92), a heating plate (93), a heat insulation plate (94), a cooling water circuit plate (95), a glue diverter plate (96) and a cylinder piston plate (97), and the cylinder piston plate (97), the glue diverter plate (96), the cooling water circuit plate (95), the heat insulation plate (94), the heating plate (93), the front mold core (92) and the rear mold core (91) are connected in sequence from top to bottom.

8. A liquid silicone mold according to claim 7, characterized in that: The cylinder piston plate (97) is provided with a piston receiving groove (971) for movably mounting the piston (5), the cylinder piston plate (97) is provided with two air passages (972) connecting the two ends of the piston receiving groove (971), the glue flow channel (961) connecting the first flow channel (21) of the cold flow inner sleeve (2) is provided on the glue flow distribution plate (96), the two side walls of the cooling water circuit plate (95) are connected with the flow channel holes (12) and the third flow channel (11) connecting the two cold flow outer sleeves (1), the heating plate (93) is provided with two hot flow channels (931), the tip of the needle valve (4) can pass through the cold flow sleeve nozzle (3) and be inserted into the mold core hole (921) of the front mold core (92), thereby blocking the mold core hole (921) and realizing needle sealing.

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