Liquid silica gel injection molding machine

Abstract

The invention discloses a liquid silica gel injection molding machine, and relates to the technical field of injection molding equipment, the liquid silica gel injection molding machine comprises a base, and a shell is fixed on the upper end face of the base; the driving assembly is installed on the upper end face of the base and located in the shell; the control panel is fixed on one side of the driving assembly; the number of the feeding devices is two, and the feeding devices are fixed to the upper end face of the driving assembly. The injection assembly is fixed to the upper end face of the driving assembly and close to the control panel, and the injection assembly communicates with the feeding equipment; wherein the feeding device at least comprises a raw material storage bin, a conveying device and a metering device, a discharging port of the raw material storage bin is communicated with the conveying device, a discharging port of the conveying device is communicated with the metering device, and a discharging port of the metering device is communicated with the injection assembly.

Description

Technical Field

[0001] This invention relates to the field of injection molding equipment technology, specifically a liquid silicone injection molding machine. Background Technology

[0002] Liquid silicone, also known as liquid silicone rubber, is a liquid rubber relative to solid high-temperature vulcanized silicone rubber. It has the characteristics of good fluidity, fast vulcanization, and is safer and more environmentally friendly. It can fully meet the requirements of food grade. Liquid silicone has excellent tear resistance, resilience, anti-yellowing, thermal stability, and heat resistance and anti-aging properties. It is mainly used in infant products, medical products, and electronic products. Liquid silicone injection molding requires precise measurement and uniform mixing of the A and B two-component rubber materials at low temperature and injection into a hot mold for curing.

[0003] The existing equipment has a compact overall layout and the injection structure is not easy to disassemble, making it difficult to clean when color changes are needed. Moreover, most of it adopts static mixing, which is a passive mixing method. Its mixing efficiency depends entirely on the flow rate, pressure and viscosity of the material. During the production process, any factor that causes flow fluctuations (such as the pulsation of the metering pump, the pressure impact caused by the reversal of the injection cylinder, and slight changes in the viscosity of the material) will immediately affect the mixing uniformity. This means that the mixing effect may vary between different batches of the same equipment, or even between different injection cycles of the same batch, making it difficult to guarantee the uniformity of product performance.

[0004] To address the above problems, this invention provides a liquid silicone injection molding machine to solve them. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides the following technical solution: a liquid silicone injection molding machine, comprising:

[0006] The base has a housing fixed to its upper surface;

[0007] A drive assembly is mounted on the upper surface of the base and located within the housing;

[0008] The control panel is fixed to one side of the drive assembly;

[0009] Two feeding devices are configured and fixed to the upper end face of the drive assembly;

[0010] An injection assembly is fixed to the upper surface of the drive assembly and close to the control panel; the injection assembly is connected to the feeding device.

[0011] The feeding equipment includes at least a raw material storage bin, a conveying device, and a metering device. The outlet of the raw material storage bin is connected to the conveying device, the outlet of the conveying device is connected to the metering device, and the outlet of the metering device is connected to the injection assembly.

[0012] Further, preferably, the driving component includes:

[0013] Fixing plate one and fixing plate two are both fixed to the upper end surface of the base, and a template is fixed to the side of fixing plate two away from fixing plate one;

[0014] The sliding plate is slidably mounted on the first fixed plate and the second fixed plate using multiple guide rods, and is close to the first fixed plate.

[0015] A closing plate is fixed to one end of multiple guide rods away from the sliding plate, and a movable template is fixed to the side of the closing plate near the fixed plate. The movable template is arranged correspondingly to the fixed template.

[0016] Link 1 has one end hinged to the middle position of the sliding plate, and the other end hinged to one end of link 2. The other end of link 2 is hinged to the fixed plate 2.

[0017] The drive cylinder is hinged to the base by two rotating parts, and its output end is hinged to the connection between the first connecting rod and the second connecting rod.

[0018] Further, preferably, the injection component includes:

[0019] The base plate is fixed to the first fixing plate and the second fixing plate.

[0020] The top plate is fixed to the base plate by two columns;

[0021] The injection cylinder is fixed to the upper end face of the top plate;

[0022] The drive plate is slidably mounted on the two columns;

[0023] At least one injection rod is mounted on the drive plate;

[0024] A mixing component is mounted on the lower end face of the base plate and corresponds to the injection rod;

[0025] An injection head is fixed to the lower end face of the mixing assembly, and a sleeve is fitted on its outer wall. The sleeve is used to adjust the temperature of the injection head.

[0026] Furthermore, preferably, both the base plate and the drive plate are provided with elongated holes, and the injection rod and the mixing assembly are both installed in the elongated holes in an adjustable manner using bolts.

[0027] Further, preferably, the hybrid component includes:

[0028] The mixing component is bolted to the bottom of the elongated hole in the base plate, and three valves are installed on its upper end face. The three valves are respectively connected to two feeding devices and an external pressure supply device.

[0029] A sliding sleeve is fixed to the lower end face of the injection rod;

[0030] The first mixing component is rotatably and sealed at the bottom of the sliding sleeve, and the interior of the mixing component is divided into a mixing chamber and an injection chamber by the first mixing component, and the mixing chamber is connected to the three valves;

[0031] The screw has one end slidably disposed inside the sliding sleeve and the other end fixed to the injection head, and the first mixing component is threadedly connected to the screw.

[0032] Further, preferably, the first hybrid component includes:

[0033] A rotating plug is rotatably and slidably disposed within the mixing component to separate the mixing component, and is rotatably connected to the sliding sleeve;

[0034] A clearance chamber is provided on the upper end face of the rotating plug;

[0035] Multiple hybrid blades are configured and evenly distributed circumferentially within the avoidance chamber;

[0036] Multiple connecting holes are configured to be formed within the clearance chamber and extend through the rotating plug;

[0037] The second mixing component is fixed inside the connecting hole.

[0038] Furthermore, preferably, all of the multiple connecting holes are arranged at an angle, and the angle is the same as the rotation direction when the rotating plug slides upward.

[0039] Further, preferably, the second mixing component includes:

[0040] A sealing ring is fixed inside the communicating hole;

[0041] A fixing plate is fixed inside the communicating hole, located below the sealing ring, and a through hole is provided in the middle of the fixing plate;

[0042] The sealing column is composed of multiple sliding columns that are slidably disposed on the fixed plate and contact the sealing ring for sealing.

[0043] The mixing column is fixed inside the communicating hole and located below the fixing plate.

[0044] Furthermore, preferably, a return spring is fitted onto the sealing post.

[0045] Furthermore, preferably, the mixing column has multiple circumferentially arranged diversion holes, the lower ends of the multiple diversion holes are all inclined, and a mixing hole is formed at the focal position.

[0046] Compared with the prior art, the present invention provides a liquid silicone injection molding machine, which has the following beneficial effects:

[0047] In this invention, the injection rod and mixing component are bolted into an elongated hole, enabling quick disassembly and fine-tuning of their positions. After disassembly, the key mixing areas can be thoroughly cleaned directly, greatly reducing the cleaning difficulty when changing colors or materials. The rotating plug of the first mixing component actively rotates under the drive of the screw, causing the mixing blades to perform strong shearing and stirring of the material, improving the mixing effect. The mixing efficiency is determined by mechanical drive, no longer entirely dependent on the flow rate and pressure fluctuations of the material, thus effectively eliminating the problem of uneven mixing caused by metering pump pulsation and reversing impact, ensuring a high degree of consistency in product performance across different batches and cycles. After primary mixing by the first mixing component, a swirling flow is generated through the inclined connecting hole, and then converged and sheared through the diversion hole and mixing hole of the second mixing component, forming a multi-stage, multi-dimensional mixing, which greatly improves the uniformity of mixing. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of the overall structure of a liquid silicone injection molding machine;

[0049] Figure 2 This is a schematic diagram of the drive component structure of a liquid silicone injection molding machine;

[0050] Figure 3 This is a schematic diagram of the injection component structure of a liquid silicone injection molding machine;

[0051] Figure 4 A schematic diagram of the mixing component structure of a liquid silicone injection molding machine;

[0052] Figure 5 A schematic diagram of the structure of the first mixing component of a liquid silicone injection molding machine;

[0053] Figure 6 A schematic diagram of the structure of the second mixing component of a liquid silicone injection molding machine;

[0054] In the diagram: 1. Base; 2. Housing; 3. Drive assembly; 4. Control panel; 5. Feeding device; 6. Injection assembly; 31. Fixing plate one; 32. Fixing plate two; 33. Sliding plate; 34. Guide rod; 35. Closing plate; 36. Connecting rod one; 37. Connecting rod two; 38. Drive cylinder; 39. Rotating component; 61. Base plate; 62. Top plate; 63. Column; 64. Oblong hole; 65. Injection cylinder; 66. Injection rod; 67. Mixing assembly; 68. Injection head; 69. First mixing... Components; 681, sleeve; 671, mixing component; 672, mixing chamber; 673, injection chamber; 674, valve; 675, sliding sleeve; 676, screw; 691, rotating plug; 692, clearance chamber; 693, mixing blade; 694, connecting hole; 695, second mixing component; 6951, sealing ring; 6952, fixed plate; 6953, sealing column; 6954, sliding column; 6955, through hole; 6956, mixing column; 6957, diversion hole; 6958, mixing hole. Detailed Implementation

[0055] Reference Figures 1-6 The present invention provides a technical solution: a liquid silicone injection molding machine, comprising:

[0056] Base 1, with housing 2 fixed to its upper end face;

[0057] The drive assembly 3 is installed on the upper surface of the base 1 and is located inside the housing 2;

[0058] Control panel 4 is fixed to one side of the drive component 3;

[0059] The feeding device 5 is configured as two and fixed on the upper end face of the drive assembly 3;

[0060] The injection assembly 6 is fixed to the upper surface of the drive assembly 3 and close to the control panel 4. The injection assembly 6 is connected to the feeding device 5.

[0061] The feeding equipment includes at least a raw material storage bin, a conveying device, and a metering device. The outlet of the raw material storage bin is connected to the conveying device, the outlet of the conveying device is connected to the metering device, and the outlet of the metering device is connected to the injection assembly 6.

[0062] In this embodiment, the driving component 3 includes:

[0063] Fixing plate 1 31 and fixing plate 2 32 are both fixed to the upper end surface of the base 1, and a template is fixed to the side of fixing plate 2 32 away from fixing plate 1 31.

[0064] The sliding plate 33 is slidably mounted on the first fixed plate 31 and the second fixed plate 32 using multiple guide rods 34, and is close to the first fixed plate 31;

[0065] A closing plate 35 is fixed to one end of a plurality of guide rods 34 away from the sliding plate 33, and a moving template is fixed to the side of the closing plate 35 near the fixed plate 32. The moving template is arranged correspondingly to the fixed template.

[0066] Link 1 36 is hinged at one end to the middle position of the sliding plate 33, and the other end is hinged to one end of link 2 37. The other end of link 2 37 is hinged to the fixed plate 2 32.

[0067] The drive cylinder 38 is hinged to the base 1 by two rotating parts 39, and its output end is hinged to the connection between the first connecting rod 36 and the second connecting rod 37.

[0068] In other words, when the output section of the drive cylinder 38 extends, the connecting rod 36 pulls the sliding plate 33 to slide towards the fixed plate 31 and pushes the closing plate 35 to slide, thereby moving the moving mold away from the fixed mold, which facilitates material handling. When the mold is closed, the drive cylinder 38 moves in the opposite direction. The linkage movement of the connecting rod 36 and the connecting rod 37 can save space significantly and reduce the overall footprint of the equipment.

[0069] In addition, the linkage movement of connecting rod 36 and connecting rod 37 enables the sliding plate 33 to have a self-locking and force-amplifying effect, that is, a large clamping force can be generated with a small cylinder thrust and it remains stable with low energy consumption.

[0070] In a preferred embodiment, the injection component 6 includes:

[0071] The base plate 61 is fixed to the first fixing plate 31 and the second fixing plate 32;

[0072] The top plate 62 is fixed to the bottom plate 61 by two columns 63;

[0073] The injection cylinder 65 is fixed to the upper end face of the top plate 62;

[0074] The drive plate is slidably mounted on the two columns 63;

[0075] At least one injection rod 66 is mounted on the drive plate;

[0076] The mixing component 67 is installed on the lower end face of the base plate 61 and corresponds to the injection rod 66;

[0077] The injection head 68 is fixed to the lower end face of the mixing component 67, and a sleeve 681 is fitted on its outer wall. The sleeve 681 is used to adjust the temperature of the injection head 68.

[0078] The temperature control function of the sleeve 681 can be used in conjunction with the injection process to achieve more precise process control. For example, the injection head 68 can be preheated before injection to prevent the material at the nozzle from solidifying prematurely due to the cold head.

[0079] In addition, both the base plate 61 and the drive plate are provided with elongated holes 64, and the injection rod 66 and the mixing component 67 are installed in the elongated holes 64 in an adjustable manner using bolts.

[0080] In other words, the elongated holes 64 on the base plate 61 and the drive plate are not only easy to disassemble, but also allow for adjustment of the lateral spacing between the injection rod 66 and the mixing component 67 within a limited range. When production requires the use of multiple sets of small injection units to correspond to multiple sprues on the mold, this design provides flexible layout adjustment capabilities without the need to replace the entire plate.

[0081] In a preferred embodiment, the hybrid component 67 includes:

[0082] The mixing component 671 is bolted to the bottom of the elongated hole 64 of the base plate 61, and three valves 674 are installed on its upper end face. The three valves 674 are respectively connected to the two feeding devices 5 and an external pressure supply device.

[0083] The sliding sleeve 675 is fixed to the lower end face of the injection rod 66;

[0084] The first mixing component 69 is rotatably and sealed at the bottom of the sliding sleeve 675, and the interior of the mixing component 671 is divided into a mixing chamber 672 and an injection chamber 673 by the first mixing component 69. The mixing chamber 672 is connected to the three valves 674.

[0085] The screw 676 has one end slidably disposed inside the sliding sleeve 675 and the other end fixed on the injection head 68, and the first mixing component 69 is threadedly connected to the screw 676.

[0086] It should be noted that the initial position of the first mixing component 69 is located above the mixing component 671. At this time, the mixing chamber 672 is smaller than the injection chamber 673. When material is injected into the mixing chamber 672, the injection rod 66 is driven to press down. Since the screw 676 cannot rotate, it can only be fixed axially. At this time, the injection rod presses down on the sliding sleeve 675, forcing the first mixing component 69, which is threadedly connected to the screw, to move downward while rotating relative to the screw. This rotation drives the mixing blade 693 on it to shear and stir components A and B at high speed in the mixing chamber 672, realizing forced active mechanical mixing directly driven by the injection action. At this time, the injection rod 66 is driven to move upward, and the material in the mixing chamber 672 enters the injection chamber 673. At the same time, it is stirred and sheared again by the first mixing component 69, improving the mixing effect. When the material has completely entered the injection chamber 673, the injection rod 66 moves in the direction of injection to perform the injection action, while feeding the next batch of material into the mixing chamber 672.

[0087] When the first mixing component 69 is attached to the top of the mixing chamber 672, pressure is supplied by an external pressure supply device so that the material in the mixing chamber 672 completely enters the injection chamber 673.

[0088] Preferably, the first mixing component 69 includes:

[0089] Rotary plug 691 is rotatably and slidably disposed within the mixing component 671 to separate the mixing component 671, and is rotatably connected to the sliding sleeve 675;

[0090] The clearance chamber 692 is formed on the upper end face of the rotating plug 691;

[0091] Multiple hybrid blades 693 are configured and evenly distributed circumferentially within the avoidance chamber 692;

[0092] Multiple connecting holes 694 are configured to be formed within the clearance chamber 692 and penetrate the rotating plug 691;

[0093] The second mixing component 695 is fixed inside the connecting hole 694.

[0094] In addition, the multiple connecting holes 694 are all arranged at an angle, and the angle is the same as the rotation direction when the rotating plug 691 slides upward.

[0095] In other words, the initially mixed material flows out through the inclined connecting hole 694 on the rotating plug 691. The inclined direction is consistent with the rotation direction of the rotating plug, and centrifugal force is used to generate swirling flow to enhance mixing.

[0096] In a preferred embodiment, the second hybrid component 695 includes:

[0097] The sealing ring 6951 is fixed inside the communicating hole 694;

[0098] The fixing plate 6952 is fixed inside the communicating hole 694 and located below the sealing ring 6951, and a through hole 6955 is provided in the middle position of the fixing plate 6952;

[0099] The sealing column 6953 is slidably disposed on the fixed plate 6952 by means of multiple sliding columns 6954, and contacts the sealing ring 6951 for sealing.

[0100] The mixing column 6956 is fixed inside the communicating hole 694 and located below the fixing plate 6952.

[0101] In addition, a return spring is fitted onto the sealing post 6953.

[0102] Preferably, the mixing column 6956 has a plurality of circumferentially arranged diversion holes 6957, the lower ends of the plurality of diversion holes 6957 are all inclined, and a mixing hole 6958 is formed at the focal position.

[0103] In other words, the material is divided into multiple fine streams through the multiple diversion holes 6957 inside the mixing column 6956, and finally converges and collides at the mixing hole 6958, further improving the mixing effect.

[0104] In practice:

[0105] Step 1: Preparation and Installation: Install the mold between the moving platen and the fixed platen. According to the product requirements, install the corresponding number of injection rods 66 and the corresponding mixing components 67 in the elongated holes 64 of the drive plate and the base plate 61 with bolts, and adjust them to the appropriate position. Connect the conveying pipes of the two feeding devices 5 to the two valves 674 corresponding to the mixing components 67. Connect the external pressure source, such as an air source or a hydraulic source, to the third valve 674.

[0106] Step 2: Parameter setting: On the control panel 4, set the injection volume, injection pressure, holding time, clamping force and speed of the drive cylinder 38, etc. Connect the temperature control medium to the injection head sleeve 681 and set the required temperature.

[0107] Step 3: Operation and Injection Cycle: Start the equipment, drive cylinder 38 to push sliding plate 33 and closing plate 35 through linkage mechanism, drive moving platen to close mold and lock;

[0108] Step 4: Feeding and Metering: The metering devices of the two feeding devices 5 accurately deliver the two liquid silica gel components A and B into the mixing chamber 672 of the mixing component 67 according to the ratio;

[0109] Step 5: Active mixing: The injection cylinder 65 drives the injection rod 66 to move downward, which in turn drives the sliding sleeve 675 and the first mixing component 69 to rotate and move downward. Material A and material B are initially mixed under the action of the rotating mixing blade 693. Then, they are mixed again by the upward movement of the first mixing component 69, transferring the material in the mixing chamber 672 to the injection chamber 673, and then deeply mixed through the inclined connecting hole 694 and the second mixing component 695.

[0110] Step Six: Injection and Pressure Holding: The uniformly mixed material enters the injection chamber 673. At this time, the injection cylinder 65 drives the injection rod 66 to move downward, thereby causing the rotary plug 691 to rotate and move downward to perform the injection operation. The material is injected into the closed mold cavity through the injection head 68. After the injection is completed, the system enters the pressure holding stage to compensate for the shrinkage of the material. While the rotary plug 691 rotates and moves downward, the next batch of material is injected into the mixing chamber 672 and stirred to further improve the mixing effect.

[0111] Step 7: Mold opening and part removal: After the pressure holding period ends, drive cylinder 38 reverses its movement to open the mold, and the robot or operator removes the molded product.

[0112] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A liquid silicone injection molding machine, characterized in that, include: The base (1) has a shell (2) fixed to its upper end surface; The drive assembly (3) is mounted on the upper surface of the base (1) and located inside the housing (2); The control panel (4) is fixed to one side of the drive assembly (3); The feeding devices (5) are configured as two and fixed on the upper end face of the drive assembly (3); The injection assembly (6) is fixed to the upper surface of the drive assembly (3) and close to the control panel (4). The injection assembly (6) is connected to the feeding device (5). The feeding equipment includes at least a raw material storage bin, a conveying device and a metering device. The outlet of the raw material storage bin is connected to the conveying device, the outlet of the conveying device is connected to the metering device, and the outlet of the metering device is connected to the injection assembly (6).

2. The liquid silicone injection molding machine according to claim 1, characterized in that, The driving component (3) includes: Fixing plate one (31) and fixing plate two (32) are both fixed to the upper end face of the base (1), and a template is fixed on the side of fixing plate two (32) away from fixing plate one (31); The sliding plate (33) is slidably mounted on the first fixed plate (31) and the second fixed plate (32) by multiple guide rods (34) and is close to the first fixed plate (31). A closing plate (35) is fixed at one end of a plurality of guide rods (34) away from the sliding plate (33), and a moving template is fixed on the side of the closing plate (32) near the fixed plate. The moving template is arranged corresponding to the fixed template. Link 1 (36) has one end hinged to the middle position of the sliding plate (33), and the other end hinged to one end of link 2 (37). The other end of link 2 (37) is hinged to the fixed plate 2 (32). The drive cylinder (38) is hinged to the base (1) by two rotating parts (39), and its output end is hinged to the connection of the first connecting rod (36) and the second connecting rod (37).

3. The liquid silicone injection molding machine according to claim 2, characterized in that, The injection component (6) includes: The base plate (61) is fixed to the first fixing plate (31) and the second fixing plate (32); The top plate (62) is fixed to the bottom plate (61) by two columns (63); The injection cylinder (65) is fixed to the upper end face of the top plate (62); The drive plate is slidably mounted on the two columns (63); At least one injection rod (66) is mounted on the drive plate; A mixing component (67) is mounted on the lower end face of the base plate (61) and corresponds to the injection rod (66); An injection head (68) is fixed to the lower end face of the mixing assembly (67), and a sleeve (681) is fitted on its outer wall. The sleeve (681) is used to adjust the temperature of the injection head (68).

4. A liquid silicone injection molding machine according to claim 3, characterized in that, Both the base plate (61) and the drive plate are provided with elongated holes (64), and the injection rod (66) and the mixing component (67) are installed in the elongated holes (64) in an adjustable manner using bolts.

5. A liquid silicone injection molding machine according to claim 3, characterized in that, The hybrid component (67) includes: The mixing component (671) is bolted to the bottom of the elongated hole (64) of the base plate (61), and three valves (674) are installed on its upper end face. The three valves (674) are respectively connected to two feeding devices (5) and an external pressure supply device. A sliding sleeve (675) is fixed to the lower end face of the injection rod (66); The first mixing component (69) is rotatably and sealed at the bottom of the sliding sleeve (675), and the interior of the mixing component (671) is divided into a mixing chamber (672) and an injection chamber (673) by the first mixing component (69). The mixing chamber (672) is connected to the three valves (674). The screw (676) has one end slidably disposed in the sliding sleeve (675) and the other end fixed on the injection head (68), and the first mixing component (69) is threadedly connected to the screw (676).

6. A liquid silicone injection molding machine according to claim 5, characterized in that, The first hybrid component (69) includes: A rotating plug (691) is rotatably and slidably disposed within the mixing component (671) for separating the mixing component (671) and is rotatably connected to the sliding sleeve (675); A clearance chamber (692) is provided on the upper end face of the rotating plug (691); Multiple mixing blades (693) are configured and evenly distributed circumferentially within the avoidance chamber (692); Multiple connecting holes (694) are configured to be opened in the recess (692) and penetrate the rotating plug (691). The second mixing component (695) is fixed inside the connecting hole (694).

7. A liquid silicone injection molding machine according to claim 6, characterized in that, The multiple connecting holes (694) are all arranged at an angle, and the angle is the same as the rotation direction when the rotating plug (691) slides upward.

8. A liquid silicone injection molding machine according to claim 6, characterized in that, The second hybrid component (695) includes: A sealing ring (6951) is fixed inside the communicating hole (694); The fixed plate (6952) is fixed inside the communicating hole (694) and located below the sealing ring (6951), and a through hole (6955) is provided in the middle position of the fixed plate (6952). The sealing column (6953) is slidably disposed on the fixed plate (6952) by multiple sliding columns (6954) and in contact with the sealing ring (6951) for sealing; The mixing column (6956) is fixed inside the connecting hole (694) and located below the fixing plate (6952).

9. A liquid silicone injection molding machine according to claim 8, characterized in that, A return spring is fitted onto the sealing column (6953).

10. A liquid silicone injection molding machine according to claim 8, characterized in that, The mixing column (6956) has multiple circumferentially arranged diversion holes (6957) inside, and the lower ends of the multiple diversion holes (6957) are all inclined, and a mixing hole (6958) is formed at the focal position.

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