Pneumatic silica gel nozzle

Abstract

The invention relates to a pneumatic silica gel nozzle which comprises a secondary nozzle, a primary nozzle, a nozzle body and a connecting unit which are sequentially connected from front to back, a sliding groove is formed in the axis of the nozzle body, the tail end of a valve needle is installed in the sliding groove in a sliding mode, and the front end of the valve needle is inserted into a third conveying channel and a fourth conveying channel. The needle head of the valve needle is the same as the outlet of the fourth conveying channel in shape; the nozzle body is provided with a long-strip-shaped through groove perpendicular to the axial direction, the through groove penetrates through the rear end of the sliding groove, the long edge of the through groove is distributed in the axial direction of the nozzle body, a needle sealing ram is inserted into the through groove, the two ends of the needle sealing ram are exposed out of the side wall of the nozzle body, the needle sealing ram can move along the long edge of the through groove, and the tail end of the valve needle is connected with the middle of the needle sealing ram. And the outer wall of the nozzle body is provided with a driving unit which is propped against the sealing needle ram and drives the sealing needle ram to move forwards. The device has the advantages of being simple in structure, convenient to disassemble, assemble and clean, capable of guaranteeing the silica gel production quality, suitable for extrusion equipment of various models and the like.

Description

Technical Field

[0001] This invention relates to the field of extruder equipment technology, and specifically to a pneumatic silicone nozzle. Background Technology

[0002] Silicone is now used more and more widely, such as in baby products, medical equipment consumables, and daily necessities. The amount of silicone used is increasing day by day, and silicone processing technology is also gradually increasing, such as extrusion molding, thermoforming, injection molding, etc. Among them, injection molding has higher requirements for equipment and processes than others, and it can mold more complex products.

[0003] Existing silicone injection equipment, especially the nozzle section, has a complex structure. Because silicone requires water cooling and temperature control during injection, existing equipment, due to its complex flow channels, necessitates the installation of numerous sealing rings, making installation and disassembly cumbersome. Most existing silicone nozzles are only suitable for a specific color and flow rate of silicone. Changing the silicone color is extremely difficult to clean, and adapting to different flow rates requires replacing the entire device, resulting in very high costs. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a pneumatic silicone nozzle that is easy to assemble and disassemble and suitable for various machine models.

[0005] To achieve the objectives of this invention, the following technical solutions are provided in this application.

[0006] In a first aspect, this application provides a pneumatic silicone nozzle, comprising a sub-nozzle, a female nozzle, a nozzle body, and a connecting unit connected sequentially from front to back. The connecting unit has a first conveying channel running through its axis; the female nozzle has a third conveying channel running through its axis; the sub-nozzle has a fourth conveying channel running through its axis; the nozzle body has multiple second conveying channels inside, with the rear end of each second conveying channel communicating with the first conveying channel and the front end of each second conveying channel communicating with the third conveying channel; the nozzle body has a groove at its axis, through which the tail end of a valve needle slides. The valve needle is installed within the chute, with its front end inserted into the third and fourth feeding channels. The needle tip of the valve needle has the same shape as the outlet of the fourth feeding channel. The nozzle body has an elongated groove perpendicular to the axial direction, passing through the rear end of the chute. The long side of the groove is distributed along the axial direction of the nozzle body. A sealing needle rod is inserted into the groove, with both ends of the sealing needle rod protruding from the sidewall of the nozzle body. The sealing needle rod can move along the long side of the groove. The tail end of the valve needle is connected to the middle of the sealing needle rod. The outer wall of the nozzle body is provided with a drive unit that abuts against the sealing needle rod and drives it to move forward. In this application, there are no steps or turning structures from the first feeding channel to the fourth feeding channel. Therefore, the silicone material will not linger for a long time from entering the nozzle to leaving the nozzle, effectively improving product quality. Moreover, when it is necessary to change colors and clean, the lack of steps or other areas where adhesive can be trapped makes cleaning easier and will not affect subsequent production.

[0007] In one embodiment of the first aspect, the nozzle body is T-shaped, and a first locking platform and a second locking platform are provided sequentially from front to back at the tail end of the nozzle body. The outer diameter of the second locking platform is larger than the outer diameter of the first locking platform and larger than the outer diameter of the front body of the nozzle body.

[0008] In one embodiment of the first aspect, the drive unit includes a piston sleeved on the outer wall of the nozzle body and a cylinder liner sleeved on the outside of the nozzle body and fixed to the nozzle body. The cylinder liner is through-hole, and has a first cavity at the front end and a second cavity at the rear end at the axial center. The inner diameter of the second cavity is the same as the outer diameter of the first clamping platform, and the rear end side of the cylinder liner abuts against the second clamping platform. The inner diameter of the first cavity is larger than the outer diameter of the front body of the nozzle body. The front end of the second cavity is provided with a first air inlet hole communicating with the outside, and the rear end of the second cavity is provided with a second air inlet hole communicating with the outside. The piston is T-shaped and includes a piston head and a push rod. The axial center of the piston is provided with a through-hole, and the inner diameter of the through-hole matches the outer diameter of the front body of the nozzle body. The piston head is located in the second cavity, and the outer diameter of the piston head is the same as the inner diameter of the second cavity. The push rod is inserted between the inner wall of the first cavity and the outer wall of the front body of the nozzle body, and the middle part of the push rod is provided with an insertion hole through which the sealing needle rod passes. When air enters through the second air inlet and the first air inlet is closed, gas enters the space between the piston tail and the second chamber. As the gas pressure increases, the gas pushes the piston forward. At this time, the piston moves forward along with the sealing needle lever, thereby driving the valve needle forward. The front end of the valve needle then blocks the outlet of the sub-needle, stopping the silicone extrusion. When the first air inlet is open and the second air inlet is closed, gas enters the air space between the piston front and the second chamber. As the gas pressure increases, the gas pushes the piston backward, ultimately causing the valve needle to move backward, opening the outlet of the sub-needle and ejecting the silicone forward.

[0009] In one embodiment of the first aspect, the cylinder liner is fixed to the nozzle body by a first bolt, and the first bolt is perpendicular to the axial direction of the nozzle body. The first mounting plate is provided with a first sealing groove, and a first sealing ring is installed in the first sealing groove. The inner wall of the first cavity is provided with a second sealing groove, and a second sealing ring is installed in the second sealing groove. This arrangement is mainly to ensure that the air entering from the first and second air intake ports only stays in the second cavity and acts on the piston, preventing gas leakage.

[0010] In one embodiment of the first aspect, the inner wall and outer wall of the piston head are respectively provided with a seventh sealing groove and an eighth sealing groove, and a seventh sealing ring and an eighth sealing ring are provided in the seventh sealing groove and the eighth sealing groove.

[0011] In one embodiment of the first aspect, the pneumatic silicone nozzle is provided with a water-cooling unit, the water-cooling unit includes a water jacket, the water jacket is fitted onto the outer wall of the female nozzle, the second mounting platform is provided with a water inlet and a water outlet, the nozzle body, the female nozzle and the water jacket are provided with a water inlet channel and a water outlet channel connected in sequence, the tail ends of the water inlet channel and the water outlet channel are respectively connected to the water inlet and the water outlet, and the front ends of the water inlet channel and the water outlet channel are connected to the gap between the inner wall of the water jacket and the outer wall of the female nozzle.

[0012] In one embodiment of the first aspect, the female nozzle is T-shaped and includes a first mounting plate and a body. A first protrusion and a second protrusion are respectively provided on the front and rear sides of the sidewall of the body. A third sealing groove and a fourth sealing groove are respectively provided on the first protrusion and the second protrusion, and a third sealing ring and a fourth sealing ring are respectively provided in the third sealing groove and the fourth sealing groove. The water jacket is T-shaped and includes a second mounting plate and a sleeve. A through-hole is provided at the axis of the water jacket. The inner diameter of the through-hole is the same as the outer diameter of the first protrusion and the second protrusion. The front end faces of the second mounting plate, the first mounting plate, and the nozzle body abut against each other in sequence and are fixedly connected by a second bolt.

[0013] In one embodiment of the first aspect, a continuous water pipe channel is provided at the connection between the front end faces of the second mounting plate, the first mounting plate, and the nozzle body. A water pipe is installed within the water pipe channel. A fifth sealing groove and a sixth sealing groove are sequentially provided on the front and rear sides of the outer wall of the water pipe. A fifth sealing ring and a sixth sealing ring are installed within the fifth and sixth sealing grooves. The fifth sealing ring is located between the outer wall of the water pipe and the inner wall of the water pipe channel of the second mounting plate; the sixth sealing ring is located between the outer wall of the water pipe and the inner wall of the water pipe channel of the nozzle body. A water passage hole is provided between the water pipe channel of the second mounting plate and the shaft hole. By providing a water pipe, the water inlet channel avoids having to pass through the contact surfaces between the first mounting plate and the nozzle body, and between the first mounting plate and the second mounting plate. Since sealing these contact surfaces is difficult, leakage can easily occur at these points, affecting product quality and the production environment.

[0014] In one embodiment of the first aspect, the tail end of the valve needle is provided with a positioning hole, through which the sealing needle rod passes.

[0015] In one embodiment of the first aspect, the connecting unit is a flange connector, and a fixing seat is provided between the nozzle body and the flange connector. A first mounting cavity is provided at the axial center of the fixing seat, and the inner wall of the first mounting cavity has internal threads. A second mounting cavity is provided at the axial center of the rear end of the nozzle body. The front end of the flange connector has an insertion part that matches the second mounting cavity (i.e., the first mounting cavity), and the side wall of the rear end of the insertion part has external threads. The nozzle body and the fixing seat are fixed by multiple third bolts. The rear end of the flange connector has multiple threaded holes. In this application, the connecting unit can take many forms; this is only a preferred embodiment, where the rearmost end of the nozzle is a flange connector. Therefore, as long as the size of the insertion part of the flange connector matches the nozzle body, the size of the rear end of the flange connector can be changed, thus making it suitable for different models of extrusion equipment. Furthermore, the replacement and maintenance of the pneumatic silicone nozzle are convenient; simply remove the entire flange connector from the extrusion equipment.

[0016] In one embodiment of the first aspect, the connecting unit is a linear connector, and a fixing seat is provided between the nozzle body and the linear connector. A first mounting cavity is provided at the axial center of the fixing seat, and the inner wall of the first mounting cavity has internal threads. A second mounting cavity is provided at the axial center of the rear end of the nozzle body. The front end of the linear connector has a plug-in portion that matches the second mounting cavity (i.e., the first mounting cavity), and the side wall of the rear end of the plug-in portion has external threads. The nozzle body and the fixing seat are fixed together by multiple third bolts. The rear side wall of the linear connector has external threads. This is a second preferred embodiment, where the connection to the extrusion equipment is changed from a flange connection to a threaded connection.

[0017] In one embodiment of the first aspect, the connecting unit is a linear connector. A second mounting cavity is provided at the axial center of the nozzle body's tail end, and multiple inclined screw holes are provided obliquely inward at the tail end of the nozzle body. The front end of the linear connector has a plug-in portion that matches the second mounting cavity, and multiple inclined steps are provided on the side wall of the plug-in portion. When the plug-in portion is inserted into the second mounting cavity and abuts against the front wall of the second mounting cavity, the inclined steps are exactly aligned with the inclined screw holes. When the mounting bolt is installed into the inclined screw holes, the front end of the mounting bolt abuts against the inclined steps. The rear side wall of the linear connector has external threads. This is another preferred method, changing the connection between the nozzle body and the connecting unit from a threaded + bolt combination to an inclined bolt abutment connection.

[0018] It should be noted that the above connection units can be randomly combined regardless of how they are connected to the nozzle body or the extrusion equipment. Other common installation methods, such as using a top flange for connection, are also acceptable. The purpose is to allow the nozzle body to be adapted to different extrusion equipment and increase its applicability.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The sealing ring of this application is easy to install and remove, and can achieve good sealing of cooling water and piston gas.

[0020] (2) The material conveying channel of this application does not have steps, backflow or other situations, and the silicone is not easy to be stuck, which can improve the quality of silicone products and is easier to clean. It is more advantageous for silicone injection that needs to be changed in color.

[0021] (3) It can be connected to extrusion equipment through multiple connection units, and is suitable for different models of extrusion equipment. The entire pneumatic silicone nozzle is easier to assemble and disassemble. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the material flow channel distribution in Example 1.

[0023] Figure 2 This is a schematic diagram of the cooling water channel distribution in Example 1.

[0024] Figure 3 This is a schematic diagram of the fixed installation distribution in Example 1.

[0025] Figure 4 This is a schematic diagram of the flange connection body in Example 1.

[0026] Figure 5 This is a schematic diagram of the material flow channel distribution of the nozzle body.

[0027] Figure 6 This is a schematic diagram of the cooling water channel distribution of the nozzle body.

[0028] Figure 7 This is a schematic diagram showing the fixed installation distribution of the nozzle body.

[0029] Figure 8 This is a schematic diagram of the piston structure.

[0030] Figure 9 This is a schematic diagram of the cylinder liner.

[0031] Figure 10 This is a schematic diagram of the cooling water channel distribution for the mother nozzle.

[0032] Figure 11 This is a schematic diagram showing the fixed installation distribution of the female nozzle.

[0033] Figure 12 This is a schematic diagram of the cooling water channel distribution of the water jacket.

[0034] Figure 13 This is a schematic diagram showing the fixed installation distribution of the water jacket.

[0035] Figure 14 This is a schematic diagram of the sub-injector nozzle.

[0036] Figure 15 This is a schematic diagram of the valve needle.

[0037] Figure 16 This is a schematic diagram of the water pipe structure.

[0038] Figure 17 This is a schematic diagram of the material flow channel distribution in Example 2.

[0039] Figure 18 This is a schematic diagram of the cooling water channel distribution in Example 2.

[0040] Figure 19 This is a schematic diagram of the fixed installation distribution in Example 2.

[0041] Figure 20 This is a schematic diagram of the flange connection body in Example 2.

[0042] Figure 21 This is a schematic diagram of the material flow channel distribution of the nozzle body in Example 2.

[0043] Figure 22 This is a schematic diagram of the cooling water channel distribution of the nozzle body in Example 2.

[0044] Figure 23 This is a schematic diagram of the fixed installation distribution of the nozzle body in Example 2.

[0045] Figure 24 This is a schematic diagram of the fixed base.

[0046] Figure 25 This is a schematic diagram of the flange connection body in Example 3.

[0047] Figure 26 This is a schematic diagram of the fixed installation distribution in Example 4.

[0048] Figure 27 This is a schematic diagram of the structure of the straight-line connector in Example 4.

[0049] In the attached drawings, 1 is the flange connector, 2 is the fixed base, 3 is the nozzle body, 4 is the cylinder liner, 5 is the piston, 6 is the female nozzle, 7 is the water jacket, 8 is the female nozzle, 9 is the first material conveying channel, 10 is the second material conveying channel, 11 is the third material conveying channel, 12 is the fourth material conveying channel, 13 is the valve needle, 14 is the sealing needle lever, 15 is the first air inlet, and 16 is the second air inlet. 17 is the water inlet, 18 is the water inlet channel, 19 is the water pipe, 20 is the water outlet channel, 21 is the water outlet, 22 is the third bolt, 23 is the first bolt, 24 is the second bolt, 25 is the mounting screw hole, 26 is the insertion part, 27 is the first external thread, 28 is the abutment platform, 29 is the second mounting cavity, 30 is the second locking platform, 31 is the first locking platform, 32 is the first sealing groove, 33 is the sliding groove, 34 is the through groove, 35 is the water pipe channel, 36 is the third screw hole, 37 is the first screw hole, 38 is the second screw hole, 39 is the piston head, 40 is the push rod, 41 is the seventh sealing groove, 42 is the eighth sealing groove, 43 is the insertion hole, and 44 is the second Cavity, 45 is the first cavity, 46 is the second sealing groove, 47 is the second protrusion, 48 is the first protrusion, 49 is the third sealing groove, 50 is the fourth sealing groove, 51 is the first mounting plate, 52 is the body, 53 is the second external thread, 54 is the water passage hole, 55 is the shaft hole, 56 is the second mounting plate, 57 is the sleeve, 58 is the second internal thread, 59 is the needle head, 60 is the needle tail, 61 is the positioning hole, 62 is the fifth sealing groove, 63 is the sixth sealing groove, 64 is the first mounting cavity, 65 is the first internal thread, 66 is the straight connecting body, 67 is the third external thread, 68 is the mounting bolt, 69 is the inclined step, and 70 is the inclined screw hole. Detailed Implementation

[0050] Unless otherwise defined, the technical or scientific terms used in this specification and claims shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. All values ​​listed herein, ranging from the minimum to the maximum, refer to all values ​​obtained by incrementing the minimum and maximum values ​​by one unit when the difference between the minimum and maximum values ​​is more than two units.

[0051] The following describes specific embodiments of the present invention. It should be noted that, in order to provide a concise description, this specification cannot provide a detailed description of all features of the actual embodiments. Without departing from the spirit and scope of the present invention, those skilled in the art can modify and substitute the embodiments of the present invention, and the resulting embodiments are also within the protection scope of the present invention. Example

[0052] The embodiments of the present invention will be described in detail below. These embodiments are implemented based on the technical solution of the present invention, and detailed implementation methods and specific operation processes are given. However, the scope of protection of the present invention is not limited to the following embodiments. Example 1

[0053] A pneumatic silicone nozzle, the structure of which is as follows: Figure 1 , Figure 2 , Figure 3 As shown, the device includes, from front to back, a sub-nozzle 8, a female nozzle 6, a nozzle body 3, a fixed base 2, and a linear connector 66. A piston 5 and a cylinder liner 4 are located outside the nozzle body 3, and a valve needle 13 is installed inside the nozzle body 3. A water jacket 7 is fitted around the outside of the female nozzle 6. Inside this pneumatic silicone nozzle, there is a material flow channel distribution structure for the silicone fluid, such as… Figure 1 As shown, there is a cooling water flow channel distribution structure, such as Figure 2 As shown, there is a distribution structure for the fixed installation (i.e., bolts) of various components, such as... Figure 3 As shown. The specific structure of each component is as follows.

[0054] Linear connector 66 Figure 4 As shown, the front end of the linear connector 66 is provided with a plug-in portion 26, and the side wall of the plug-in portion 26 is provided with multiple inclined steps 69. The rear end side wall of the linear connector 66 is provided with a third external thread 67.

[0055] The structure of nozzle body 3 is as follows Figure 5 , Figure 6 , Figure 7 As shown, the nozzle body 3 is T-shaped. From front to back, a first retaining platform 31 and a second retaining platform 30 are sequentially arranged in the middle of the nozzle body 3. The outer diameter of the second retaining platform 30 is larger than the outer diameter of the first retaining platform 31, which is also larger than the outer diameter of the front side of the nozzle body 3. A second mounting cavity 29 is provided at the axial center of the tail end of the nozzle body 3. The shape and size of the second mounting cavity 29 match the insertion part 26, and multiple inclined screw holes 70 are obliquely inwardly arranged at the tail end of the nozzle body 3. When the insertion part 26 is inserted into the second mounting cavity 29 and abuts against the front wall of the second mounting cavity 29, the inclined platform 69 is exactly aligned with the inclined screw holes 70. Then, the mounting bolt 68 is installed into the inclined screw holes 70 until the front end of the mounting bolt 68 abuts against the inclined platform 69. Multiple second feeding channels 10 are provided inside the nozzle body 3 (only two are shown as an example in the figure). The rear end of each second feeding channel 10 is connected to the first feeding channel 9, and the front end of each second feeding channel 10 is connected to the third feeding channel 11 at the axis of the female nozzle 6. A groove 33 is provided at the axis of the nozzle body 3, and the tail 60 of a valve needle 13 is slidably installed in the groove 33. The structure of the valve needle 13 is as follows: Figure 15As shown, the front end is provided with a needle head 59, and the rear end is provided with a needle tail 60. The outer diameter of the needle tail 60 is fitted with the inner diameter of the slide groove 33 (i.e., the gap between the two is 2~15μm). The tail end of the valve needle 13 is provided with a positioning hole 61. The front end of the valve needle 13 is inserted into the third material conveying channel 11 on the axis of the female nozzle 6 and the fourth material conveying channel 12 on the axis of the female nozzle 8, and the needle head 59 of the valve needle 13 has the same shape as the outlet of the fourth material conveying channel 12. The nozzle body 3 is provided with an elongated through groove 34 perpendicular to the axial direction. The through groove 34 passes through the rear end of the slide groove 33, and the long side of the through groove 34 is distributed along the axial direction of the nozzle body 3.

[0056] The outer wall of the nozzle body 3 is fitted with something like Figure 8 Piston 5 as shown and as Figure 9 The cylinder liner 4 shown is a through-type cylinder liner, with a first cavity 45 at the front end and a second cavity 44 at the rear end. The inner diameter of the second cavity 44 is the same as the outer diameter of the first mounting plate 31, and the rear end of the cylinder liner 4 abuts against the second mounting plate 30. The inner diameter of the first cavity 45 is larger than the outer diameter of the front body of the nozzle body 3. The front end of the second cavity 44 has a first air inlet 15 communicating with the outside, and the rear end of the second cavity 44 has a second air inlet 16 communicating with the outside. The nozzle body 3 has a first threaded hole 37 perpendicular to the axial direction. The cylinder liner 4 is fixed to the nozzle body 3 by a first bolt 23, which matches the first threaded hole 37. The first mounting plate 31 has a first sealing groove 32, and a first sealing ring is installed in the first sealing groove 32. The inner wall of the first cavity 45 has a second sealing groove 46, and a second sealing ring is installed in the second sealing groove 46.

[0057] Piston 5 is T-shaped and includes piston 39 and push rod 40. A through-hole is provided at the axis of piston 5, the inner diameter of which matches the outer diameter of the front body of nozzle body 3. Piston 39 is located within the second cavity 44, and its outer diameter is the same as the inner diameter of the second cavity 44. Push rod 40 is inserted between the inner wall of the first cavity 45 and the outer wall of the front body of nozzle body 3, and has a insertion hole 43 in its middle. A sealing needle rod 14 is provided within the through groove 34 of nozzle body 3. The sealing needle rod 14 can move along the long side of the through groove 34. The middle part of the sealing needle rod 14 passes through the positioning hole 61 of the needle tail 60, and both ends of the sealing needle rod 14 protrude from the nozzle body 3 and pass through the insertion hole 43 on the push rod 40. Therefore, the movement of piston 5 will drive the movement of sealing needle rod 14, which in turn drives the valve needle 13 to move axially. The piston 39 has a seventh sealing groove 41 and an eighth sealing groove 42 on its inner and outer walls, and a seventh sealing ring and an eighth sealing ring are provided in the seventh sealing groove 41 and the eighth sealing groove 42, respectively.

[0058] The nozzle body 3 has a second mounting plate 30 with an inlet 17 and an outlet 21. Inside the nozzle body 3, there is an inlet channel 18 communicating with the inlet 17 and an outlet channel 20 communicating with the outlet 21. At the front end of the nozzle body 3, the inlet channel 18 and outlet channel 20 are connected to a water pipe channel 35. A second screw hole 38 is also provided on the front end face of the nozzle body 3.

[0059] The structure of the mother nozzle 6 is as follows Figure 10 , Figure 11 As shown, it is T-shaped and includes a first mounting plate 51 and a body 52. ​​A first protrusion 48 and a second protrusion 47 are respectively provided on the front and rear sides of the sidewall of the body 52. ​​A third sealing groove 49 and a fourth sealing groove 50 are respectively provided on the first protrusion 48 and the second protrusion 47, and a third sealing ring and a fourth sealing ring are respectively provided in the third sealing groove 49 and the fourth sealing groove 50. A second external thread 53 is provided at the front end of the body 52, such as... Figure 14 The tail end of the sub-nozzle 8 is provided with a second internal thread 58 that matches the second external thread 53, thereby fixing the sub-nozzle 8 to the front end of the female nozzle 6 and connecting the fourth material conveying channel 12 of the sub-nozzle 8 with the third material conveying channel 11 of the female nozzle 6. A second screw hole 38 is provided on the first mounting plate 51. A through water pipe channel 35 is also provided on the first mounting plate 51.

[0060] A sleeve such as is fitted on the outside of the female nozzle 6 Figure 12 , Figure 13 The water jacket 7 shown is T-shaped and includes a second mounting plate 56 and a housing 57. A through-hole 55 is provided at the center of the water jacket 7. The inner diameter of the through-hole 55 is the same as the outer diameter of the first protrusion 48 and the second protrusion 47, and is sealed using a third sealing ring and a fourth sealing ring. The second mounting plate 56 has a second screw hole 38. During installation, the front ends of the second mounting plate 56, the first mounting plate 51, and the nozzle body 3 abut against each other in sequence, connecting their second screw holes 38, and then securing them together with a second bolt 24. The second mounting plate 56 has a rearward-opening water pipe channel 35. After the second mounting plate 56, the first mounting plate 51, and the nozzle body 3 are fixed, their water pipe channels 35 are interconnected, and a device such as... Figure 16 The water pipe 19 is shown. A fifth sealing groove 62 and a sixth sealing groove 63 are sequentially provided on the front and rear sides of the outer wall of the water pipe 19. A fifth sealing ring and a sixth sealing ring are installed in the fifth sealing groove 62 and the sixth sealing groove 63, respectively. The fifth sealing ring is located between the outer wall of the water pipe 19 and the inner wall of the water pipe channel 35 of the second mounting plate 56; the sixth sealing ring is located between the outer wall of the water pipe 19 and the inner wall of the water pipe channel 35 of the nozzle body 3. Additionally, a water passage hole 54 is provided between the water pipe channel 35 of the second mounting plate 56 and the shaft hole 55.

[0061] In this embodiment, the flow paths of the silicone and cooling water are as follows.

[0062] Molten silicone enters the pneumatic silicone nozzle from the first feeding channel 9, splits into multiple streams within the nozzle body 3, enters the second feeding channel 10, then reassembles in the third feeding channel 11, and is finally delivered to the fourth feeding channel 12. Under the action of the valve needle 13, the outlet of the fourth feeding channel 12 is opened or closed.

[0063] When air enters through the second air inlet 16 and the first air inlet 15 is closed, gas enters the space between the tail end of piston 5 and the second chamber 44. As the air pressure increases, the gas pushes piston 5 forward. At this time, piston 5 moves forward along with the sealing needle lever 14, thereby driving valve needle 13 forward. The front end of valve needle 13 blocks the outlet of sub-injector 8, and silicone extrusion stops. When the first air inlet 15 is open and the second air inlet 16 is closed, gas enters the air space between the front end of piston 5 and the second chamber 44. As the air pressure increases, the gas pushes piston 5 backward, thereby ultimately driving valve needle 13 backward, opening the outlet of sub-injector 8, and ejecting silicone forward.

[0064] Cooling water enters from the inlet 17, flows through the inlet channel 18 of the nozzle body 3 into the water pipe 19, then enters the water pipe channel 35 of the second mounting plate 56 in the water jacket 7, then enters the gap between the shaft hole 55 and the outer wall of the female nozzle 6 (located between the first protrusion 48 and the second protrusion 47) through the water hole 54, then enters another water pipe channel 35 through another water hole 54, and enters the outlet channel 20 through another water pipe 19, and finally flows out from the outlet 21. Example 2

[0065] This embodiment 1 adopts a similar structure to that of embodiment 1, including nozzle body 3, female nozzle 6, and female nozzle 8, as detailed in the following figure. Figure 17 , Figure 18 , Figure 19 As shown, the details are as follows.

[0066] This embodiment of the pneumatic silicone nozzle includes, from front to back, a sub-nozzle 8, a female nozzle 6, a nozzle body 3, a fixing base 2, and a flange connector 1. A piston 5 and a cylinder liner 4 are provided on the outside of the nozzle body 3, and a valve needle 13 is installed inside the nozzle body 3. A water jacket 7 is fitted on the outside of the female nozzle 6. Inside this pneumatic silicone nozzle, there is a material flow channel distribution structure for the silicone fluid, such as… Figure 17 As shown, there is a cooling water flow channel distribution structure, such as Figure 18 As shown, there is a distribution structure for the fixed installation (i.e., bolts) of various components, such as... Figure 19As shown. The material flow channel distribution structure and cooling water flow channel distribution structure are basically the same as in Example 1, and the principle is also the same; therefore, they will not be described again in this example. The specific structures of each component are as follows.

[0067] The structure of flange connector 1 is as follows Figure 20 As shown, a first conveying channel 9, which runs through the front and rear, is provided at its axis; a plug-in part 26 is provided at its front end, the front side wall of the plug-in part 26 is smooth, and the rear side wall is provided with a first external thread 27 extending to the abutment platform 28. The rear end of the flange connector 1 is provided with multiple mounting screw holes 25 for fixed connection with the extrusion equipment.

[0068] The structure of nozzle body 3 is as follows Figure 21 , Figure 22 , Figure 23 As shown, the nozzle body 3 is T-shaped, and a second mounting cavity 29 is provided at the rear axis of the nozzle body 3. A space is provided between the nozzle body 3 and the flange connector 1 as shown in the image. Figure 24 The mounting base 2 shown has a first mounting cavity 64 at its axial center. The inner wall of the first mounting cavity 64 has a first internal thread 65. The insertion part 26 at the front end of the flange connector 1 is inserted into the second mounting cavity 29 and the first mounting cavity 64, and the flange connector 1 is fixed to the mounting base 2 by the first internal thread 65 and the first external thread 27. The tail end of the nozzle body 3 and the mounting base 2 have multiple third screw holes 36, and are fixed by third bolts 22. Example 3

[0069] This embodiment adopts a structure that is basically the same as that of Embodiment 2, except that the shaft at the tail end of the flange connector 1 is flared, that is, the inlet of the first material conveying channel 9 has a tapered structure. Figure 25 As shown. Example 4

[0070] This embodiment uses the same structure as Embodiment 2, including the fixed base 2, nozzle body 3, female nozzle 6, and female nozzle 8. The difference is that: In this embodiment, the flange connector is replaced with a straight connector 66, such as... Figure 26 As shown, the structure of the straight-line connector 66 is as follows: Figure 27 As shown, the front end of the linear connector 66 is also provided with a plug-in portion 26. The front sidewall of the plug-in portion 26 is smooth, and the rear sidewall is provided with a first external thread 27 extending to the abutment platform 28. This is the same structure as the front end of the flange connector in Embodiment 1. The rear sidewall of the linear connector 66 is provided with a third external thread 67 and is connected to the extrusion equipment via a thread.

[0071] The above description of the embodiments is intended to enable those skilled in the art to understand and apply this application. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without creative effort. Therefore, this application is not limited to the embodiments described herein, and any improvements and modifications made by those skilled in the art based on the disclosure of this application without departing from the scope and spirit of this application are within the scope of this application.

Claims

1. A pneumatic silicone nozzle, characterized in that, The pneumatic silicone nozzle includes, from front to back, a sub-nozzle, a female nozzle, a nozzle body, and a connecting unit, wherein... The connecting unit has a first conveying channel that runs through the front and back at its axis; the female nozzle has a third conveying channel that runs through the front and back at its axis; the daughter nozzle has a fourth conveying channel that runs through the front and back at its axis; and the nozzle body has multiple second conveying channels inside. The rear end of each second conveying channel is connected to the first conveying channel, and the front end of each second conveying channel is connected to the third conveying channel. The nozzle body has a groove at its axis, and the tail end of a valve needle is slidably installed in the groove. The front end of the valve needle is inserted into the third and fourth material conveying channels, and the needle tip of the valve needle has the same shape as the outlet of the fourth material conveying channel. The nozzle body has an elongated groove perpendicular to the axial direction, which passes through the rear end of the groove. The long side of the groove is distributed along the axial direction of the nozzle body. A sealing needle rod is inserted into the groove, and both ends of the sealing needle rod protrude from the side wall of the nozzle body. The sealing needle rod can move along the long side of the groove. The tail end of the valve needle is connected to the middle part of the sealing needle rod. The outer wall of the nozzle body is provided with a drive unit that abuts against the sealing needle rod and drives the sealing needle rod to move forward.

2. The pneumatic silicone nozzle as described in claim 1, characterized in that, The nozzle body is T-shaped, and a first locking platform and a second locking platform are provided sequentially from front to back at the tail end of the nozzle body. The outer diameter of the second locking platform is larger than the outer diameter of the first locking platform and larger than the outer diameter of the front body of the nozzle body.

3. The pneumatic silicone nozzle as described in claim 2, characterized in that, The drive unit includes a piston sleeved on the outer wall of the nozzle body and a cylinder liner sleeved on the outside of the nozzle body and fixed to the nozzle body. The cylinder liner runs through the nozzle body from front to back and includes a first cavity at the front end and a second cavity at the rear end at the axial center. The inner diameter of the second cavity is the same as the outer diameter of the first clamping platform, and the rear end side of the cylinder liner abuts against the second clamping platform. The inner diameter of the first cavity is larger than the outer diameter of the front side of the nozzle body. The front end of the second cavity is provided with a first air inlet hole communicating with the outside, and the rear end of the second cavity is provided with a second air inlet hole communicating with the outside. The piston is T-shaped and includes a piston head and a push rod. A through-hole is provided at the center of the piston. The inner diameter of the through-hole matches the outer diameter of the front body of the nozzle. The piston head is located in the second cavity, and the outer diameter of the piston head is the same as the inner diameter of the second cavity. The push rod is inserted between the inner wall of the first cavity and the outer wall of the front body of the nozzle, and a hole is provided in the middle of the push rod, through which the sealing needle rod passes.

4. The pneumatic silicone nozzle as described in claim 3, characterized in that, The cylinder liner is fixed to the nozzle body by a first bolt, and the first bolt is perpendicular to the axial direction of the nozzle body. The first mounting plate is provided with a first sealing groove, and a first sealing ring is installed in the first sealing groove. The inner wall of the first cavity is provided with a second sealing groove, and a second sealing ring is installed in the second sealing groove.

5. The pneumatic silicone nozzle as described in claim 3, characterized in that, The piston head has a seventh sealing groove and an eighth sealing groove on its inner and outer walls, respectively, and a seventh sealing ring and an eighth sealing ring are provided in the seventh sealing groove and the eighth sealing groove, respectively.

6. The pneumatic silicone nozzle as described in claim 2, characterized in that, The pneumatic silicone nozzle is equipped with a water-cooling unit, which includes a water jacket fitted onto the outer wall of the female nozzle. The second mounting platform is provided with a water inlet and a water outlet. The nozzle body, the female nozzle, and the water jacket are provided with sequentially connected water inlet and water outlet channels. The tail ends of the water inlet and water outlet channels are respectively connected to the water inlet and water outlet, and the front ends of the water inlet and water outlet channels are connected to the gap between the inner wall of the water jacket and the outer wall of the female nozzle.

7. The pneumatic silicone nozzle as described in claim 6, characterized in that, The female nozzle is T-shaped and includes a first mounting plate and a body. A first protrusion and a second protrusion are respectively provided on the front and rear sides of the side wall of the body. A third sealing groove and a fourth sealing groove are respectively provided on the first protrusion and the second protrusion, and a third sealing ring and a fourth sealing ring are respectively provided in the third sealing groove and the fourth sealing groove. The water jacket is T-shaped and includes a second mounting plate and a housing. The water jacket has a through hole at its center, and the inner diameter of the hole is the same as the outer diameter of the first and second protrusions. The front ends of the second mounting plate, the first mounting plate, and the nozzle body abut against each other in sequence and are fixedly connected by a second bolt.

8. The pneumatic silicone nozzle as described in claim 7, characterized in that, A continuous water pipe channel is provided at the connection between the second mounting plate, the first mounting plate, and the front end face of the nozzle body. A water pipe is installed in the water pipe channel. A fifth sealing groove and a sixth sealing groove are provided sequentially on the front and rear sides of the outer wall of the water pipe. A fifth sealing ring and a sixth sealing ring are installed in the fifth sealing groove and the sixth sealing groove. The fifth sealing ring is located between the outer wall of the water pipe and the inner wall of the water pipe channel of the second mounting plate. The sixth sealing ring is located between the outer wall of the water pipe and the inner wall of the water pipe channel of the nozzle body. A water passage hole is provided between the water pipe channel of the second mounting plate and the shaft hole.

9. The pneumatic silicone nozzle as described in claim 1, characterized in that, The valve needle has a positioning hole at its tail end, through which the sealing needle rod passes.

10. The pneumatic silicone nozzle as described in claim 1, characterized in that, The connecting unit is a flange connector, and a fixing seat is provided between the nozzle body and the flange connector. A first mounting cavity is provided at the axial center of the fixing seat, and the inner wall of the first mounting cavity is provided with internal threads. A second mounting cavity is provided at the axial center of the rear end of the nozzle body. The front end of the flange connector is provided with a plug-in part that matches the second mounting cavity, i.e. the first mounting cavity, and the side wall of the rear end of the plug-in part is provided with external threads. The nozzle body and the fixing seat are fixed by multiple third bolts. The rear end of the flange connector is provided with multiple screw holes.

11. The pneumatic silicone nozzle as described in claim 1, characterized in that, The connecting unit is a linear connector, and a fixing seat is provided between the nozzle body and the linear connector. A first mounting cavity is provided at the axis of the fixing seat, and the inner wall of the first mounting cavity is provided with internal threads. A second mounting cavity is provided at the rear axis of the nozzle body. The front end of the linear connector is provided with a plug-in part that matches the second mounting cavity, i.e. the first mounting cavity, and the side wall of the rear end of the plug-in part is provided with external threads. The nozzle body and the fixing seat are fixed by multiple third bolts. The rear side wall of the linear connector is provided with external threads.

12. The pneumatic silicone nozzle as described in claim 1, characterized in that, The connecting unit is a linear connector. A second mounting cavity is provided at the center of the tail end of the nozzle body, and multiple inclined screw holes are provided obliquely inward at the tail end of the nozzle body. The front end of the linear connector is provided with a plug-in part that matches the second mounting cavity, and multiple inclined steps are provided on the side wall of the plug-in part. When the plug-in part is inserted into the second mounting cavity and abuts against the front wall of the second mounting cavity, the inclined steps are exactly in the same straight line as the inclined screw holes. When the mounting bolt is installed into the inclined screw holes, the front end of the mounting bolt abuts against the inclined steps. The rear side wall of the linear connector is provided with external threads.

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