A multi-pass tube annular die and a method of forming a multi-pass tube

Abstract

A multi-port pipe annular mold and a method for forming a multi-port pipe are disclosed. The multi-port pipe annular mold includes: a male mold, a female mold, an ejector assembly, and a synchronous feeding assembly; venting channels are distributed on both sides of the mold groove opening and connected to the outside of the multi-port pipe annular mold; a main feeding nozzle is installed on the male mold, and a secondary feeding nozzle is installed on the female mold; the main feeding port of the main feeding nozzle is used to input material, and the main discharge port of the main feeding nozzle is adjacent to and connected to the secondary feeding port of the secondary feeding nozzle; a feeding valve needle is movably installed on the main feeding nozzle, and the feeding valve needle can move to disengage from or block the main discharge port; the main feeding nozzle is connected to the discharge nozzle of the male mold; and the secondary feeding nozzle is connected to the discharge nozzle of the female mold. This solution solves the problems of uneven material feeding caused by the time difference before and after mold feeding, as well as the problem of flash caused by difficulty in venting during pipe forming.

Description

Technical Field

[0001] This invention relates to the field of pipe forming, and more particularly to a multi-port pipe annular mold and a multi-port pipe forming method. Background Technology

[0002] Existing tubular molding processes use a unidirectional discharge method to deliver plastic to the mold. The plastic enters from one side of the mold cavity and is gradually transferred from one side to the other, eventually forming a tubular structure. However, as the plastic is transferred to the other side of the mold cavity, air from the original cavity also gradually flows to the other side. Just before the tubular structure is formed, the gas is compressed and concentrated on the other side of the mold cavity. Under pressure, this can cause deformation of the plastic during molding, leading to problems such as flash. Furthermore, the plastic's placement at different times on the front and rear sides of the tubular structure after entering the mold cavity results in different physical and chemical properties at different locations within the tubular structure. This leads to variations in the mechanical properties of the tubular structure during molding, such as uneven stress distribution. This is especially problematic for multi-channel tubular structures, where unidirectional discharge not only fails to solve the flash problem but also results in longer molding times and significant structural differences between the main pipe and branch pipes. Summary of the Invention

[0003] The purpose of this invention is to propose a multi-channel annular mold, which uses the main feeding nozzle as the main material feeding mechanism. By linking the feeding valve needle of the main feeding nozzle with the discharge valve needle of the discharge nozzle, the time difference between the material entering the mold cavity from the male mold and the female mold can be shortened. This not only achieves synchronous feeding to shorten the feeding time, but also allows the gas in the mold cavity to be discharged synchronously through the venting channels on both sides of the mold cavity during the feeding process to prevent the material from deforming during molding.

[0004] The present invention also proposes a method for forming a multi-port pipe.

[0005] To achieve this objective, the present invention adopts the following technical solution: A multi-port pipe annular mold includes: a male mold, a female mold, a discharge assembly, and a synchronous feeding assembly; The male mold and the female mold are horizontally fitted together, with their mold grooves abutting each other to form a mold cavity; the groove shape of each mold groove includes half of the contour of the multi-port pipe, and the shape of the mold cavity includes the overall contour of the multi-port pipe; the male mold and / or the female mold are provided with exhaust channels on their contact surfaces, the exhaust channels are distributed on both sides of the groove opening and connected to the outside of the multi-port pipe annular mold. The discharge assembly includes: a discharge nozzle and a discharge valve needle; the discharge nozzle is respectively installed on the male mold and the female mold, and the output end of the discharge nozzle is connected to the mold groove; the discharge valve needle is movably installed inside the discharge nozzle; The synchronous feeding assembly includes: a main feeding nozzle, a slave feeding nozzle, and a feeding valve needle; The main feed nozzle is installed on the male mold, and the secondary feed nozzle is installed on the female mold; the main feed port of the main feed nozzle is used to input material, and the main discharge port of the main feed nozzle is adjacent to and connected to the secondary feed port of the secondary feed nozzle; the feed valve needle is movably installed on the main feed nozzle, and the feed valve needle can move to disengage from or block the main discharge port; the main feed nozzle is connected to the discharge nozzle of the male mold; and the secondary feed nozzle is connected to the discharge nozzle of the female mold.

[0006] Preferably, the synchronous feeding assembly includes: a receiving valve needle; The receiving valve needle is movably mounted on the feed nozzle; the receiving valve needle moves to disengage from or block the feed inlet.

[0007] More preferably, the main feed nozzle is provided with a main conveyor channel and a secondary conveyor channel; The feed valve needle is disposed on the main conveyor channel, which has the main feed port and the main discharge port; the input end of the auxiliary conveyor channel is connected to the main conveyor channel and is located near the main discharge port; the output end of the auxiliary conveyor channel is connected to the discharge nozzle of the male mold.

[0008] Preferably, one end of the secondary conveyor is located close to the main discharge port, and the other end of the secondary conveyor extends towards the main feed port of the main conveyor and connects to the discharge nozzle of the male mold, so that the distance from the main feed port to the male mold is greater than the distance from the main feed port to the female mold.

[0009] Preferably, it further includes: a controller and multiple valve needle actuators; The output of a single valve needle driver is connected to the discharge valve needle, feed valve needle, or receiving valve needle, and is used to drive the discharge valve needle, feed valve needle, or receiving valve needle to move linearly. The controller is communicatively connected to multiple valve needle actuators.

[0010] Preferably, the controller acquires the material conveying parameters, calculates the first time of the material between the main feed port and the mold groove of the male mold, and calculates the second time of the material between the main feed port and the mold groove of the female mold, and controls multiple valve needle drivers to make the first time and the second time close to or the same, so that the material arrives at the mold grooves of both the male mold and the female mold synchronously.

[0011] Preferably, it further includes: a docking device; The connector is installed on one of the male mold and the female mold, and the other mold moves to abut against the connector; the connector is provided with a docking groove, and the docking groove is provided with a male part, a docking part and a female part that are interconnected in sequence; the inner diameter of the male part and / or the inner diameter of the female part gradually decreases in the direction of the docking part; The main feed nozzle is located at one end of the main discharge port and is disposed at the male connector; the secondary feed nozzle is located at one end of the secondary feed port and is disposed at the female connector; the main discharge port and the secondary feed port are connected through the mating part.

[0012] Preferably, it further includes: a mold core component; The mold core component is provided with a fixing part and a main core part; The mold groove is composed of one or more molding units; the molding unit includes: a core-slotted groove and a core-slotted groove; The fixing part is installed in the core slot; the main core extends into the core slot, and the outer wall of the main core and the inner wall of the core slot form a frame space gap so that the material is formed along the outer wall of the main core.

[0013] Preferably, the inner diameter of the exhaust duct is less than 0.5 mm.

[0014] A method for forming a multi-port pipe includes the following steps: (1) The male mold and the female mold are fitted together, and their mold grooves are close together to form a mold cavity; (2) Input material into the main feed nozzle of the mold, and the material flows through the inside of the main feed nozzle; (3) Open the feed valve needle, and the material is transferred to the feed nozzle near the main discharge port, so that the discharge nozzle of the female mold is conveyed, and at the same time it is also conveyed to the discharge nozzle of the male mold. (4) Simultaneously open the discharge valve needles of the discharge nozzles of both the male mold and the female mold, so that the material is output from the mold groove. The material is output from the inner wall of the mold groove towards the mating surface of the male mold and the female mold, and the air is discharged through the exhaust channels on both sides of the mating surface at the mating surface of the male mold and the female mold.

[0015] Compared with the prior art, one of the above technical solutions has the following beneficial effects: This solution provides a multi-port pipe ring mold, which uses the main feeding nozzle as the main material feeding mechanism. By linking the feeding valve needle of the main feeding nozzle with the discharge valve needle of the discharge nozzle, the time difference between the material entering the mold cavity from the male mold and the female mold can be shortened. This not only achieves synchronous feeding to shorten the feeding time, but also allows the gas in the mold cavity to be discharged synchronously through the venting channels on both sides of the mold cavity during the feeding process to prevent the material from deforming during molding. This solves the problems of uneven material feeding caused by the time difference before and after mold feeding, as well as the problem of flash caused by the difficulty in venting the tube mold during molding. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of one embodiment of a multi-port annular mold; Figure 2 This is a schematic diagram of one embodiment of the connection between the discharge component and the synchronous feeding component; Figure 3 This is a cross-sectional structural diagram of one embodiment of the connection between the discharge component and the synchronous feeding component; Figure 4 This is a cross-sectional structural schematic diagram of one embodiment of a multi-port annular mold; Figure 5 This is a structural schematic diagram of one embodiment of the docking device; Figure 6 This is a structural schematic diagram of one embodiment of the male or female mold.

[0017] in: Male mold 1, female mold 2, ejection assembly 3, synchronous feeding assembly 4; valve pin actuator 5; connector 6; mold core 7; Mold groove 100; mold cavity 101; venting channel 102; core slot 1011; core slot 1012; Discharge nozzle 31, discharge valve needle 32; Main feed nozzle 41, feed slave nozzle 42, feed valve needle 43; receiving valve needle 44; Main conveyor 411, secondary conveyor 412; main feed inlet 413; main discharge outlet 414; secondary feed inlet 415; Connecting groove 61; male part 611, connecting part 612, female part 613; Fixing part 71, main core part 72; frame space gap 73. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0019] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," "inner side," "outer side," "inner end," "outer end," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, features defined with "first" and "second" may explicitly or implicitly include one or more of these features, used to distinguish descriptive features, without any order or emphasis. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0020] like Figure 1-6 A multi-tube ring mold includes: a male mold 1, a female mold 2, a discharge assembly 3, and a synchronous feeding assembly 4; The male mold 1 and the female mold 2 are horizontally fitted together, with their mold grooves 100 abutting each other to form a mold cavity 101; the groove shape of each mold groove 100 includes half of the contour of the multi-port pipe, and the shape of the mold cavity 101 includes the overall contour of the multi-port pipe; the male mold 1 and / or the female mold 2 are provided with exhaust channels 102 on their contact surfaces, the exhaust channels 102 are distributed on both sides of the groove opening of the mold groove 100 and connected to the outside of the multi-port pipe annular mold; The discharge assembly 3 includes a discharge nozzle 31 and a discharge valve needle 32; the discharge nozzle 31 is respectively installed on the male mold 1 and the female mold 2, and the output end of the discharge nozzle 31 is connected to the mold groove 100; the discharge valve needle 32 is movably installed inside the discharge nozzle 31. The synchronous feeding assembly 4 includes: a main feeding nozzle 41, a secondary feeding nozzle 42, and a feeding valve needle 43; The main feed nozzle 41 is installed on the male mold 1, and the secondary feed nozzle 42 is installed on the female mold 2. The main feed port 413 of the main feed nozzle 41 is used to input materials, and the main discharge port 414 of the main feed nozzle 41 is adjacent to and connected to the secondary feed port 415 of the secondary feed nozzle 42. The feed valve needle 43 is movably installed on the main feed nozzle 41, and the feed valve needle 43 can move to disengage from or block the main discharge port 414. The main feed nozzle 41 is connected to the discharge nozzle 31 of the male mold 1, and the secondary feed nozzle 42 is connected to the discharge nozzle 31 of the female mold 2.

[0021] This solution provides a multi-port pipe ring mold, which uses the main feeding nozzle 41 as the main material feeding mechanism. The feeding valve needle 43 of the main feeding nozzle 41 and the discharge valve needle 32 of the discharge nozzle 31 can be linked to shorten the time difference between the material entering the mold groove 100 from the male mold 1 and the female mold 2 respectively. This can achieve synchronous feeding to shorten the feeding time, and can also simultaneously discharge the gas in the mold cavity 101 through the exhaust channels 102 on both sides of the mold groove 100 during the feeding process to prevent the material from deforming during molding. This solves the problem of uneven material feeding caused by the time difference before and after the mold feeding, as well as the problem of flash caused by the difficulty in venting the tube mold during molding.

[0022] Specifically, the male mold 1 and female mold 2 move relative to each other and fit together during use, which can be achieved by means of a mechanism such as a press; the male mold 1 and female mold 2 are each provided with a mold groove 100, and when the male mold 1 and female mold 2 fit together, the mold grooves 100 of the two can form a closed mold cavity 101; the mold groove 100 is provided with a half-profile of a multi-port pipe, which refers to the shape of the overall profile of the multi-port pipe after being divided into two halves; the male mold 1 and female mold 2 are each provided with a discharge nozzle 31, and a discharge valve needle 32 is installed in the discharge nozzle 31, and the discharge nozzles 31 at different positions output materials to the mold groove 100 at their respective positions; according to common knowledge, the discharge valve needle 32 can be driven by a common linear actuator to move in the discharge nozzle 31. It can detach from or block the output end of the discharge nozzle 31; in the initial state, the discharge valve needle 32 blocks the output end of the discharge nozzle 31; the feed valve needle 43 blocks the main discharge port 414 of the main feed nozzle 41; the main feed port 413 of the main feed nozzle 41 inputs material, and the material is conveyed along the main feed nozzle 41, which can drive the feed valve needle 43 to move relatively within the main feed nozzle 41; the material has two conveying paths; one conveying path is that the material is conveyed along the main feed nozzle 41 and transferred to the discharge nozzle 31 of the male mold 1; the other conveying path is that after the feed valve needle 43 detaches from the main discharge port 414 of the main feed nozzle 41, the material is output to the feed port 415 of the feed slave nozzle 42 and transferred to the female mold 2. The discharge nozzle 31; at this time, the discharge valve needle 32 can be driven to move almost synchronously, so that the discharge valve needle 32 disengages from the output end of the discharge nozzle 31, thereby allowing the material to be output to the mold groove 100 almost synchronously, so that the material fills the mold groove 100 of the male mold 1 and the female mold 2 almost synchronously, and the mold cavity 101 is finally filled with material; in this solution, the feeding method of the discharge nozzles 31 facing each other can make the material start to fill from the inner wall of the mold groove 100. The material first fills the inner wall of the mold groove 100 and then fills the opening of the mold groove 100, which can make the gas in the mold groove 100 discharged towards the groove opening. Finally, the gas in the mold cavity 101 moves towards the mating surface of the male mold 1 and the female mold 2; and the exhaust channel 102 is distributed on both sides of the groove opening of the mold groove 100. Gas is discharged outside the multi-tube annular mold through the exhaust channels 102 on both sides of the groove opening of the mold groove 100. In this way, the male mold 1 and female mold 2 can achieve the effect of synchronous feeding in opposite directions through the linkage of the discharge valve needle 32 and the feed valve needle 43, which can avoid the problem of gas being difficult to discharge due to unidirectional feeding. At the same time, in this solution, the discharge valve needles 32 of the male mold 1 and female mold 2 can be opened or closed almost synchronously. The material moves from the inner wall of the mold groove 100 to the opening of the mold groove 100. Since the groove shape of the mold groove 100 is a half contour, the feeding of the material is equivalent to the material being distributed from the outside of the overall contour of the workpiece to the center. The material can be placed symmetrically on the symmetrical position of the workpiece with close feeding parameters, so that the material is more uniform.This solution primarily addresses the issue of large-sized through-tubes. A unidirectional feeding method would prolong the feeding time, leading to differences in the material's environment before and after feeding. This results in variations in material parameters, such as different stresses during workpiece formation, making the workpiece prone to defects. The most significant difference occurs between the starting and ending points of the feeding process. Therefore, this solution achieves synchronous feeding to shorten the feeding time. Furthermore, during the feeding process, the venting channels 102 on both sides of the mold groove 100 simultaneously expel gas from the mold cavity 101, preventing material deformation during molding. This solves the problems of uneven material feeding due to the time difference before and after mold feeding, as well as the problem of flash caused by difficulty in venting during tube molding.

[0023] Furthermore, in this scheme, the male mold 1 and the female mold 2 are horizontally fitted. Since the mold groove 100 has a groove half-contour, the mold groove 100 can be equipped with a discharge nozzle 31 along the length of the channel. The output end of the discharge nozzle 31 is preferably located in the middle of the mold groove 100, that is, in the middle position between the top and the bottom. This position is located on the left and right sides of the through pipe.

[0024] In one embodiment of this solution, the feed nozzle 42 may not be equipped with a receiving valve needle 44, that is, the output of the main feed nozzle 41 is controlled only by the feed valve needle 43.

[0025] In the optimal embodiment, the feed nozzle 42 may be equipped with a receiving valve needle 44. The synchronous feeding assembly 4 includes: a receiving valve needle 44; The receiving valve needle 44 is movably mounted on the feed nozzle 42; the receiving valve needle 44 can move to disengage from or block the feed inlet 415.

[0026] The receiving valve needle 44 is movably mounted on the feed nozzle 42, and abuts against the feed port 415 of the feed nozzle 42. Thus, the main discharge port 414 of the main feed nozzle 41 and the feed port 415 of the feed nozzle 42 abut against each other. The timing of material output at the main discharge port 414 can be controlled by the feed valve needle 43, and the timing of material input at the feed port 415 can be controlled by the receiving valve needle 44. The discharge valve needles 32 of both the male mold 1 and the female mold 2 can respectively control the timing of material output from the mold groove 100. This further ensures that the time of material input into the male mold 1 and the female mold 2 is similar, and also that the time of material output to the mold groove 100 is similar, further improving the uniformity of the channel.

[0027] More preferably, the main feed nozzle 41 is provided with a main conveyor channel 411 and a secondary conveyor channel 412; The feed valve needle 43 is disposed on the main conveyor channel 411, which is provided with the main feed port 413 and the main discharge port 414; the input end of the auxiliary conveyor channel 412 is connected to the main conveyor channel 411 and is located near the main discharge port 414; the output end of the auxiliary conveyor channel 412 is connected to the discharge nozzle 31 of the male mold 1.

[0028] To ensure that the output time of the main feed nozzle 41 to the male mold 1 and the female mold 2 is close, this solution preferably uses a "dual-channel structure" for the main feed nozzle 41. The main conveyor channel 411 is mainly used to install the feed valve needle 43. When the feed valve needle 43 blocks the main discharge port 414, the material can only be transferred to the secondary conveyor channel 412 because the connection position of the secondary conveyor channel 412 is close to the main discharge port 414 of the main conveyor channel 411. When the feed valve needle 43 is disengaged from the main discharge port 414 and the receiving valve needle 44 is disengaged from the secondary feed port 415, the material can enter the feed nozzle 42 from the main discharge port 414 through the secondary feed port 415. The main feed nozzle 41 is equivalent to diverting the flow, sending the material to the discharge nozzles 31 of both the male mold 1 and the female mold 2 at the same time. Furthermore, since the discharge nozzles 31 are all equipped with discharge valve needles 32, the problem of premature material feeding will not occur. Furthermore, the secondary conveyor channel 412 can extend the distance from the material output to the discharge nozzle 31 of the male mold 1. Combined with the linkage of the feed valve needle 43 and the receiving valve needle 44, the material can arrive at the discharge valve needle 32 simultaneously. For example, when the path between the discharge nozzle 31 of the male mold 1 and the main feed nozzle 41 is greater than the path between the discharge nozzle 31 of the female mold 2 and the feed nozzle 42, the secondary conveyor channel 412 can be used to feed material first, while the receiving valve needle 44 blocks the feed port 415. After the material is conveyed to a specific distance, the feed port 415 is opened, and then the material is fed through the secondary conveyor channel 412. Material is conveyed to the feed nozzle 42 to ensure that the material reaches the discharge valve needle 32 of both the male mold 1 and the female mold 2 simultaneously. When the path between the discharge nozzle 31 of the male mold 1 and the main feed nozzle 41 is shorter than the path between the discharge nozzle 31 of the female mold 2 and the feed nozzle 42, the main discharge port 414 of the main feed nozzle 41 and the feed port 415 of the feed nozzle 42 can be opened directly after feeding, and the material is diverted to the secondary conveyor channel 412. The secondary conveyor channel 412 extends the material conveying distance, ensuring that the material reaches the discharge valve needle 32 of both the male mold 1 and the female mold 2 simultaneously.

[0029] Preferably, one end of the secondary conveyor channel 412 is located close to the main discharge port 414, and the other end of the secondary conveyor channel 412 extends towards the main feed port 413 of the main conveyor channel 411 and connects to the discharge nozzle 31 of the male mold 1, so that the distance from the main feed port 413 to the male mold 1 is greater than the distance from the main feed port 413 to the female mold 2.

[0030] This design extends the distance of material from the main feed port 413 to the male mold 1 by extending the secondary conveyor channel 412. This increases the distance between the main feed nozzle 41 and the secondary feed nozzle 42, making the distance from the main feed port 413 to the male mold 1 greater than the distance from the main feed port 413 to the female mold 2. This allows the secondary conveyor channel 412 to compensate for the time required for the main feed nozzle 41 and the secondary feed nozzle 42 to align and discharge the material. At the same time, since the secondary conveyor channel 412 extends in the opposite direction, with one end connected to a position near the main discharge port 414 and the other end extending towards the main feed port 413, the space occupied by the main feed nozzle 41 can be reduced.

[0031] Preferably, it further includes: a controller and multiple valve needle actuators 5; The output end of a single valve needle driver 5 is connected to the discharge valve needle 32, the feed valve needle 43 or the receiving valve needle 44, and is used to drive the discharge valve needle 32, the feed valve needle 43 or the receiving valve needle 44 to move linearly. The controller is communicatively connected to multiple valve needle drivers 5.

[0032] The controller can control multiple valve needle actuators 5, so that each valve needle actuator 5 drives the valve needle to move at a specific feeding point. For example, it can simultaneously control the discharge valve needle 32, or simultaneously control the feed valve needle 43 and the receiving valve needle 44, so that the valve needle can be moved to disengage from or block the nozzle opening, thereby achieving the function of controlling material transfer.

[0033] More preferably, the controller acquires the material conveying parameters, calculates the first time of the material between the main feed port 413 and the mold groove 100 of the male mold 1, and calculates the second time of the material between the main feed port 413 and the mold groove 100 of the female mold 2, and controls the multiple valve needle drivers 5 to make the first time and the second time close to or the same, so that the material arrives at the mold groove 100 of both the male mold 1 and the female mold 2 synchronously.

[0034] The material conveying parameters include chemical composition, viscosity, flow rate, conveying cross-section, temperature, etc.; the path between the main feed port 413 and the mold groove 100 of the male mold 1 is known, and the path between the main feed port 413 and the mold groove 100 of the female mold 2 is also known. These paths are preset during mold design and can be adjusted manually to correct errors. That is, given the material flow rate and path, the time it takes for the material to reach the discharge nozzles 31 of both the male mold 1 and the female mold 2 can be calculated. When the first time is less than the second time, the controller can disengage the feed valve needle 43 and the receiving valve needle 44 from their corresponding openings, allowing the material to be discharged. Valve needle 32 blocks the discharge nozzle 31 of male mold 1, so that the first time is equal to the second time, and the material is output to the mold slots 100 of both male mold 1 and female mold 2. When the first time is greater than the second time, the controller can control the feed valve needle 43 and the receiving valve needle 44 to block the corresponding openings, so that the material enters the secondary conveyor 412 in advance. After a specific time, the controller can control the feed valve needle 43 and the receiving valve needle 44 to disengage from the corresponding openings, and the material is output from the feed nozzle 42, so that the first time is equal to the second time, and the material is output to the mold slots 100 of both male mold 1 and female mold 2.

[0035] Preferably, it further includes: a docking device 6; The connector 6 is installed on one of the male mold 1 and the female mold 2, while the other is movable to abut against the connector 6; the connector 6 is provided with a docking groove 61, and the docking groove 61 is provided with a male part 611, a docking part 612 and a female part 613 that are interconnected in sequence; the inner diameter of the male part 611 and / or the inner diameter of the female part 613 gradually decreases in the direction of the docking part 612; The main feed nozzle 41 is disposed at one end of the main discharge port 414 on the male connector 611; the secondary feed nozzle 42 is disposed at one end of the secondary feed port 415 on the female connector 613; the main discharge port 414 and the secondary feed port 415 are connected through the docking part 612.

[0036] The connector 6 allows for more accurate alignment of the main feed nozzle 41 and the secondary feed nozzle 42 when the male mold 1 and female mold 2 are engaged, thereby reducing the difficulty of their engagement. Since the connector 6 is installed on one of the male mold 1 and female mold 2, and the other moves to abut against the connector 6, the main feed nozzle 41 can be pre-positioned on the male connection 611, and the secondary feed nozzle 42 can be placed on the female connection 613 during mold closing; or vice versa. The feed nozzle 41 can be pre-set in the female part 613, and then placed in the male part 611 when the mold is closed; at the same time, the male part 611 and the female part 613 can be provided with inclined end faces, which are inclined from the opening direction to the mating part 612, so that the inner diameter of the male part 611 and / or the inner radial direction of the female part 613 towards the mating part 612 gradually decrease, so as to guide the feed nozzle 41 and the feed nozzle 42 to be mated in place, thereby reducing the difficulty of matching the feed nozzle 41 and the feed nozzle 42.

[0037] Preferably, it further includes: a mold core component 7; The mold core 7 is provided with a fixing part 71 and a main core part 72; The mold groove 100 is composed of one or more molding units; the molding unit includes: a core dividing groove 1011 and a core dividing groove 1012; The fixing part 71 is installed in the core-fixing groove 1011; the main core part 72 extends into the core-fixing groove 1012, and the outer wall of the main core part 72 and the inner wall of the core-fixing groove 1012 form a frame space gap 73 so that the material is formed along the outer wall of the main core part 72.

[0038] Without the core component 7, this solution can produce a solid tubular object, which can then be processed into a hollow through-tube. Alternatively, the core component 7 can be used. The fixing part 71 of the core component 7 is located in the core-fixing groove 1011. With the inner wall of the fixing part 71 in contact with the inner wall of the core-fixing groove 1011, material is prevented from entering the fixing part 71. The main core part 72 of the core component 7 extends into the core-fixing groove 1012. The outer wall of the main core part 72 and the inner wall of the core-fixing groove 1012 form a support space gap 73, which is equivalent to making the main core part 72 suspended. After the material enters the support space gap 73 of the mold cavity 101, it can be formed along the outer wall of the main core part 72, thereby forming a through-tube structure.

[0039] The mold groove 100 is composed of one or more molding units; for the multi-channel pipe, it has different branches, and each branch can correspond to a single molding unit, so that the placement of the mold core 7 can be more stable and flexible.

[0040] Preferably, the inner diameter of the exhaust duct 102 is less than 0.5 mm.

[0041] The inner diameter of the exhaust channel 102 is preferably controlled to be less than 0.5 mm, for example, 0.4 mm, 0.3 mm, 0.2 mm, or 0.1 mm; in the optimal embodiment, the inner diameter of the exhaust channel 102 is 0.01-0.05 mm; with this inner diameter, the exhaust channel 102 can be used only for exhaust, without allowing material to enter the exhaust channel 102 and causing blockage, and further preventing the occurrence of flash.

[0042] A method for forming a multi-port pipe includes the following steps: (1) The male mold 1 and the female mold 2 are fitted together, and their mold grooves 100 are close together to form a mold cavity 101; (2) Material is fed into the main feed nozzle 41 of the mold 1, and the material flows through the inside of the main feed nozzle 41; (3) Open the feed valve needle 43, and the material is transferred to the feed nozzle 42 at the position close to the main discharge port 414, so that the discharge nozzle 31 of the female mold 2 is conveyed, and at the same time it is also conveyed to the discharge nozzle 31 of the male mold 1. (4) Simultaneously open the discharge valve needle 32 of the discharge nozzle 31 of both male mold 1 and female mold 2, so that the material is output from the mold groove 100. The material is output from the inner wall of the mold groove 100 towards the mating surface of male mold 1 and female mold 2, and the air is discharged through the exhaust channel 102 on both sides of the mating surface at the mating surface of male mold 1 and female mold 2.

[0043] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A multi-port pipe annular mold, characterized in that, include: Male mold, female mold, ejection assembly, and synchronous feeding assembly; The male mold and the female mold are horizontally fitted together, with their mold grooves abutting each other to form a mold cavity; the groove shape of each mold groove includes half of the contour of the multi-port pipe, and the shape of the mold cavity includes the overall contour of the multi-port pipe; the male mold and / or the female mold are provided with exhaust channels on their contact surfaces, the exhaust channels are distributed on both sides of the groove opening and connected to the outside of the multi-port pipe annular mold. The discharge assembly includes: a discharge nozzle and a discharge valve needle; the discharge nozzle is respectively installed on the male mold and the female mold, and the output end of the discharge nozzle is connected to the mold groove; the discharge valve needle is movably installed inside the discharge nozzle; The synchronous feeding assembly includes: a main feeding nozzle, a slave feeding nozzle, and a feeding valve needle; The main feed nozzle is installed on the male mold, and the secondary feed nozzle is installed on the female mold; the main feed port of the main feed nozzle is used to input material, and the main discharge port of the main feed nozzle is adjacent to and connected to the secondary feed port of the secondary feed nozzle; the feed valve needle is movably installed on the main feed nozzle, and the feed valve needle can move to disengage from or block the main discharge port; the main feed nozzle is connected to the discharge nozzle of the male mold; and the secondary feed nozzle is connected to the discharge nozzle of the female mold.

2. The multi-tube annular mold according to claim 1, characterized in that, The synchronous feeding assembly includes: a receiving valve needle; The receiving valve needle is movably mounted on the feed nozzle; the receiving valve needle moves to disengage from or block the feed inlet.

3. A multi-tube annular mold according to claim 2, characterized in that, The main feed nozzle is equipped with a main conveyor channel and a secondary conveyor channel; The feed valve needle is disposed on the main conveyor channel, which has the main feed port and the main discharge port; the input end of the auxiliary conveyor channel is connected to the main conveyor channel and is located near the main discharge port; the output end of the auxiliary conveyor channel is connected to the discharge nozzle of the male mold.

4. A multi-tube annular mold according to claim 3, characterized in that, One end of the secondary conveyor is located close to the main discharge port, and the other end of the secondary conveyor extends towards the main feed port of the main conveyor and connects to the discharge nozzle of the male mold, so that the distance from the main feed port to the male mold is greater than the distance from the main feed port to the female mold.

5. A multi-channel annular mold according to claim 2, 3 or 4, characterized in that, Also includes: Controller and multiple valve needle actuators; The output of a single valve needle driver is connected to the discharge valve needle, feed valve needle, or receiving valve needle, and is used to drive the discharge valve needle, feed valve needle, or receiving valve needle to move linearly. The controller is communicatively connected to multiple valve needle actuators.

6. A multi-port pipe annular mold according to claim 5, characterized in that, The controller acquires the material conveying parameters, calculates the first time of the material between the main feed port and the mold groove of the male mold, and calculates the second time of the material between the main feed port and the mold groove of the female mold, and controls multiple valve needle drivers to make the first time and the second time close to or the same, so that the material arrives at the mold grooves of both the male mold and the female mold synchronously.

7. A multi-tube annular mold according to claim 1, characterized in that, Also includes: docking device; The connector is installed on one of the male mold and the female mold, and the other mold moves to abut against the connector; the connector is provided with a docking groove, and the docking groove is provided with a male part, a docking part and a female part that are interconnected in sequence; the inner diameter of the male part and / or the inner diameter of the female part gradually decreases in the direction of the docking part; The main feed nozzle is located at one end of the main discharge port and is disposed at the male connector; the secondary feed nozzle is located at one end of the secondary feed port and is disposed at the female connector. The main discharge port and the secondary feed port are connected through the docking part.

8. A multi-port pipe annular mold according to claim 1, characterized in that, Also includes: Mold core parts; The mold core component is provided with a fixing part and a main core part; The mold groove is composed of one or more molding units; the molding unit includes: a core-slotted groove and a core-slotted groove. The fixing part is installed in the core slot; the main core extends into the core slot, and the outer wall of the main core and the inner wall of the core slot form a frame space gap so that the material is formed along the outer wall of the main core.

9. A multi-port annular mold according to any one of claims 1-4, 7, or 8, characterized in that, The inner diameter of the exhaust passage is less than 0.5 mm.

10. A method for forming a multi-port pipe, characterized in that, Includes the following steps: (1) The male mold and the female mold are fitted together, and their mold grooves are close together to form a mold cavity; (2) Input material into the main feed nozzle of the mold, and the material flows through the inside of the main feed nozzle; (3) Open the feed valve needle, and the material is transferred to the feed nozzle near the main discharge port, so that the discharge nozzle of the female mold is conveyed, and at the same time it is also conveyed to the discharge nozzle of the male mold. (4) Simultaneously open the discharge valve needles of the discharge nozzles of both the male mold and the female mold, so that the material is output from the mold groove. The material is output from the inner wall of the mold groove towards the mating surface of the male mold and the female mold, and the air is discharged through the exhaust channels on both sides of the mating surface at the mating surface of the male mold and the female mold.

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