Multi-nozzle co-injection hot runner

Abstract

Two sets of feeding structures are symmetrically arranged on the left side and the right side of a mold base, a nozzle body is installed in the middle of the lower end of the mold base, the nozzle body is sleeved with a nozzle body heater, and three sets of nozzle structures which are distributed in a linear mode and arranged in an up-down sliding mode are arranged in the nozzle body. A grading mechanism used for driving the nozzle structures to slide up and down is installed on the rear side of the interior of the fixed mold plate, a valve element lifting mechanism used for opening and closing the nozzle structures is further installed on the upper portion of the interior of the mold base, and two feeding structures are arranged, and each feeding structure is independently provided with one independently-controlled valve element lifting mechanism; and the two groups of hot runners are arranged in the runner plate in a matched manner and are in butt joint with the two groups of feeding structures respectively, so that injection molding can be performed by using two plastics or two different colors at the same time, and injection molding can also be performed independently as required.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding equipment, in particular to a multi-nozzle co-injection hot runner. Background Art

[0002] The hot nozzles currently used for injection molding are all single-channel structures, and the hot runners used have only one injection head for feeding. The hot nozzles of this structure are very convenient to process and manufacture, and can be applied to most products. At present, if two plastics need to be injected at the same time, it can only be achieved by dividing into two molds. For some injection molds, the spacing between the multiple injection ports on the injection mold is small, and multiple nozzles cannot be used for contact injection at the same time. For this reason, we designed a multi-nozzle co-injection hot runner. Summary of the invention

[0003] The multi-nozzle co-injection hot runner proposed by the invention solves the problem of simultaneously injecting two kinds of plastics.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A multi-nozzle co-injection hot runner, comprising a fixed template, a hot runner fixed plate is installed above the fixed template, a hot runner fixing plate is recessed above to form a hot runner installation cavity, a runner plate is fixed in the hot runner installation cavity, a top plate is installed above the hot runner fixing plate, and the fixed template, the hot runner fixed plate, the runner plate and the top plate form a mold base;

[0006] The mold base is symmetrically provided with two groups of feeding structures, a nozzle body is installed in the middle of the lower end of the mold base, a nozzle body heater is sleeved on the outside of the nozzle body, three groups of nozzle structures that are linearly distributed and slide up and down are arranged inside the nozzle body, a grading mechanism for driving the nozzle structure to slide up and down is installed on the rear side of the fixed template, and a valve core lifting mechanism for opening and closing the nozzle structure is also installed on the top of the mold base.

[0007] Furthermore, the feeding structure includes two main nozzles symmetrically arranged on the top plate, a heating element is arranged between the main nozzles and the top plate, and positioning rings are respectively installed above the two main nozzles;

[0008] Two groups of sealed cylinders are symmetrically arranged below the fixed template, and side valve cores are arranged on the push rods of the two groups of sealed cylinders. The side valve cores pass through the flow channel plate and extend above the inner wall of the main nozzle, and the side valve cores are sealed with the flow channel plate and the top of the main nozzle.

[0009] Furthermore, two groups of hot runners are symmetrically arranged inside the runner plate, the upper parts of the two groups of hot runners are aligned with and abutted against the outlets of the two main nozzles, and the lower ends of the two groups of hot runners are connected to the nozzle bodies, respectively. A heating couple for heating the material inside the hot runner is also arranged inside the runner plate, so that the material inside the main nozzle can enter the hot runner and then enter the nozzle structure. The heating couple is arranged in cooperation with the material so that the material will not solidify, thereby facilitating the flow of the material.

[0010] A through hole is opened at the lower end of the flow channel plate, which is connected to the hot runner so that the side valve core can extend into the main nozzle. The side valve core and the through hole are sealed and designed to slide, so that the valve core can move up and down under the action of the closed cylinder, thereby releasing the seal of the inlet above the main nozzle and allowing the material to enter the hot runner.

[0011] Furthermore, a diverter groove is provided at the top of the nozzle body, and the bottom end of the diverter groove penetrates downward to form three groups of linearly distributed sockets. A plug-in tube is plugged into the upper part of the socket, and the plug-in tube is slid up and down and plugged into the nozzle structure. A guide block is provided above the nozzle body, and the guide block has two groups of openings symmetrically on the left and right. The lower end of the opening is connected to the diverter groove, and the top of the nozzle body abuts against the bottom of the guide block.

[0012] Furthermore, the nozzle structure includes an extension tube that is slidably inserted in the sleeve port up and down, a nozzle head is fixed at the bottom end of the extension tube, the bottom end of the nozzle head passes through the nozzle body and is placed below it, the lower end of the plug-in tube slides and is sealed and inserted in the extension tube, a main valve core is slidably arranged inside the extension tube up and down, the lower end of the main valve core passes through the nozzle head and is placed below the outside, and a seal is arranged between the main valve core and the lower end of the nozzle head, a small outlet end is arranged at the bottom end of the nozzle head, the lower end of the main valve core is plugged and sealed with the outlet end, thereby ensuring that the internal material will not leak in the gap between the outlet end and the main valve core;

[0013] A contact piece is provided inside the extension tube, and the contact piece is a 1 / 4 circular structure. The contact piece is tilted downward at one end close to the main valve core. A downward pressure head is provided outside the main valve core, and the downward pressure head contacts the lower surface of the contact piece. When the nozzle structure moves downward, the main valve core can move downward therewith, thereby ensuring that the lower end of the valve core is still placed at the outlet end, thereby ensuring the sealing.

[0014] Furthermore, two groups of lifting cavities are symmetrically arranged inside the nozzle body, and three groups of sliding openings are opened on the inner side of the lifting cavities, and the three groups of sliding openings are respectively connected to the inside of the three groups of sleeve ports;

[0015] The grading mechanism comprises two groups of lifting groups arranged in a circumferential array in the lifting chambers on the left and right sides, each group of the lifting groups comprises three lifting plates, and the multiple lifting plates on the left and right sides are independently connected to the three extension pipes through support plates respectively;

[0016] Multiple lifting plates are arranged in parallel at the left and right ends, and the innermost lifting plate is connected to the nozzle structure close to the grading cylinder through a support plate, the middle lifting plate is connected to the middle nozzle structure through a support plate, and the nozzle structure farthest from the grading cylinder is connected to the outermost lifting plate through a support plate. The three groups of nozzle structures can move up and down under the action of the three lifting plates, and can move downward as needed;

[0017] Three driving grooves of different sizes are separately arranged on the three lifting plates of the lifting group in the same group, and linear sliders are arranged in the lifting chambers of the left and right groups for sliding forward and backward. A lifting column is arranged at one end of the linear slider facing inward, and the lifting column extends into the driving groove and makes sliding contact with the driving groove. An extension rod is connected to one of the linear sliders, and the other end of the extension rod is connected to the push rod of the grading cylinder, and the grading cylinder is installed on the fixed template. The extension or telescopic extension of the push rod of the grading cylinder can make the movable slider move forward and backward along the lifting chamber, thereby making the lifting plate move up and down, so that the nozzle structure extends downward, and the injection molding operation can be performed;

[0018] The fixed template is provided with two groups of ejection holes, and the ejection holes are connected with the lifting chamber. A driving rod 1 and a driving rod 2 are respectively provided in the two groups of ejection holes for sliding back and forth, and the driving rod 1 and the driving rod 2 are respectively connected with two linear sliders. The driving rod 1 and the driving rod 2 are both provided with tooth grooves. A gear is also rotatably installed inside the fixed template. The driving rod 1 and the driving rod 2 are meshed with the gears through the tooth grooves. When a linear slider moves back and forth due to the stepping cylinder, the other linear slider will move in the opposite direction under the action of the driving rod 1, the driving rod 2 and the gear, so that the corresponding nozzle structure is subjected to force on both sides synchronously, so that the lifting and lowering are more stable.

[0019] Furthermore, the driving groove includes a horizontal portion 1 and a horizontal portion 2 in a linear structure, and the horizontal portion 2 is located above the horizontal portion 1, and the horizontal portion 1 and the horizontal portion 2 are connected via a downward pressing portion in an arc structure. In an initial state, the lifting column is placed in the horizontal portion 1, and when the lifting column moves along the horizontal portion 1 to the downward pressing portion, it will cause the corresponding lifting plate to move downward, thereby enabling the corresponding nozzle structure to move downward, and the lifting plate not placed in the downward pressing portion and the horizontal portion 2 will maintain its original position unchanged;

[0020] The length of the horizontal part 1 of the three driving grooves gradually increases from the inside to the outside, the size of the downward pressure part remains unchanged, and the length of the horizontal part 2 gradually decreases. When moving, the nozzle structure closest to the grading cylinder moves downward first, followed by the middle nozzle structure.

[0021] Furthermore, the valve core lifting mechanism includes three groups of deflection sleeves distributed linearly, the three groups of deflection sleeves are embedded in the flow channel plate, and circular holes are set through the top and bottom thereof, and the inner wall of the circular hole is provided with a deflection structure for the main valve core deflection, the three groups of main valve cores pass through the three circular holes respectively and are placed above them, the main valve core is placed in the inner part of the circular hole and is provided with a deflection column, the deflection column is slidably placed in the deflection structure, and the two are slidably connected, the main valve core will move down along the deflection structure in the process of moving down with the extension tube and the nozzle head, and deflect along the designated path in the process of moving down, so that the pressure head is separated from the contact piece, and the main valve core can move upward at this time, so that the main valve core is separated from the outlet end of the nozzle head, so that the internal material can flow out of the injection molding;

[0022] A connecting cylinder is installed on the top plate, and a connecting cover is installed at the lower end of the connecting cylinder. The interior of the connecting cover is hollow to form a plug-in cavity. Three linearly distributed notches are arranged below the connecting cover. The three main valve cores pass through the three notches and are movably placed in the plug-in cavity, and a lifting plate is arranged on the top of the main valve core. There is a certain distance between the lifting plate and the top and bottom of the plug-in cavity. After one or more main valve cores move down a distance with the nozzle structure, the main valve core is close to the bottom end of the plug-in cavity, and the connecting cover moves downward under the action of the connecting cylinder, and the main valve core moves upward and returns to its initial position through the lifting plate. At this time, the bottom end of the main valve core will be separated from the outlet end of the nozzle head, and the remaining main valve core and the nozzle structure remain unchanged and the material cannot flow out of the injection molding.

[0023] Furthermore, the deflection structure includes a downward displacement groove and an upward displacement groove vertically downward, the bottom end of the upward displacement groove is below the downward displacement groove, and the bottom end of the downward displacement groove is connected to the bottom end of the upper displacement groove by a curved deflection groove, and a reversing groove 1 is arranged at a connection point between the bottom end of the upper displacement groove and the deflection groove, and a reversing groove 2 is arranged vertically upward away from one end of the upper displacement groove, and the top end of the reversing groove 2 is connected to the deflection groove, and the deflection sleeve is a cylindrical structure. During processing, a rectangular plate is milled as shown in FIG. Fig. 9 The deflected structure shown can then be rolled into a cylindrical structure;

[0024] The inner wall of the deflection structure is tangent to the outer surface of the deflection column. In the initial state, the deflection column is in the downward groove, and the lower pressure head is in contact with the lower surface of the contact piece. When working, the grading mechanism causes the nozzle structure to move downward. At this time, the deflection column will move along the downward groove and the deflection groove to just below the upper groove. At this time, the nozzle structure moves into place, and the main valve core will also rotate accordingly. At this time, the lower pressure head is deflected and does not contact the lower surface of the contact piece. At this time, the lifting plate corresponding to the upper end of the main valve core is close to the bottom end of the plug-in cavity, and the connecting cylinder rises to make the main valve core free from the blockage of the nozzle head, so that It can unload materials for injection molding, and after injection molding, it will descend along the upward groove to its bottom again to seal it. When it needs to be reset, the main valve core continues to move downward, and then moves upward. It will enter the flip groove two along the flip groove one. When its height is consistent with the height of the bottom end of the upward groove, the nozzle structure and the main valve core move upward together under the action of the grading cylinder and the connecting cylinder respectively, and the main valve core is in place. During the movement, the main valve core will deflect along the deflection groove, so that the lower pressure head will contact with the lower surface of the contact piece. At this time, the whole returns to its initial state.

[0025] Beneficial effects of the present invention:

[0026] 1. By setting two sets of feeding structures, and each feeding structure is provided with an independently controlled valve core lifting mechanism, in conjunction with two sets of hot runners arranged in the flow channel plate, the two sets of hot runners are respectively connected with the two sets of feeding structures, so that two plastics or two different colors can be used for injection molding at the same time, and injection molding can also be performed separately according to needs;

[0027] 2. By setting three sets of independently distributed nozzle structures in the mold base and cooperating with the grading mechanism, the three nozzle structures can select the corresponding downward movement amount according to the needs, and then can contact the injection mold and perform injection molding operations on it. The three nozzle structures correspond to three sizes, and then during injection molding, the flow distribution of each part inside the mold is uniform, which greatly improves the injection molding quality of the product, and there is no need to replace the nozzle when injecting molds of different sizes, which improves convenience;

[0028] 3. Through the setting of the grading mechanism, the three nozzle structures can select the corresponding amount of downward movement according to the needs, and cooperate with the valve core lifting mechanism, which can make the main valve core in the nozzle mechanism move upward, release the seal of the nozzle structure, so that the internal circulating material can be discharged, and injection molding can only be carried out after the nozzle structure is extended upward, avoiding the collision caused by the mold base being too close to the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of a front and cross-sectional view of a multi-nozzle co-injection hot runner proposed by the present invention;

[0030] Figure 2 for Figure 1 A front cross-sectional schematic diagram of

[0031] Figure 3 for Figure 1 A right sectional schematic diagram of

[0032] Figure 4 for Figure 2 Structural diagram of the intermediate grading mechanism, valve core lifting mechanism, and nozzle structure;

[0033] Figure 5 for Figure 4 Structural diagram of the middle grading mechanism and the nozzle structure;

[0034] Figure 6 for Figure 4 The structural diagram of the three lifting plates in the same group;

[0035] Figure 7 for Figure 4 A cross-sectional view of

[0036] Figure 8 for Figure 7 The enlarged schematic diagram at A in the middle;

[0037] Fig. 9 for Figure 4 An expanded view of the interior of the middle deflection sleeve;

[0038] Fig.10 for Figure 2 The enlarged schematic diagram of point B in the middle;

[0039] Fig.11 for Figure 2 Top view of the nozzle body.

[0040] Numbers in the figure: 1, fixed template; 11, ejection hole; 2, hot runner fixed plate; 21, hot runner installation cavity; 3, top plate; 4, valve core lifting mechanism; 41, connecting cylinder; 42, connecting cover; 421, plug-in cavity; 43, deflection sleeve; 44, deflection structure; 441, downward displacement groove; 442, deflection groove; 443, upward displacement groove; 444, flip groove one; 445, flip groove two; 5, grading mechanism; 51, grading cylinder; 52, extension rod; 53, lifting plate; 531, horizontal part one; 532, downward pressure part; 533, horizontal part two; 54, drive Rod one; 55, gear; 56, driving rod two; 57, linear slider; 571, lifting column; 6, feeding structure; 61, positioning ring; 62, main nozzle; 63, heating element; 64, closed cylinder; 65, side valve core; 7, flow channel plate; 71, hot runner; 8, nozzle body; 81, nozzle heater; 82, guide block; 83, diverter groove; 84, lifting chamber; 85, plug-in tube; 9, nozzle structure; 91, extension tube; 911, contact piece; 92, nozzle head; 93, main valve core; 931, deflection column; 932, lifting plate; 933, pressure head. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0042] Reference Figure 1-11 A multi-nozzle co-injection hot runner comprises a fixed template 1, a hot runner fixed plate 2 is installed above the fixed template 1, a hot runner installation cavity 21 is formed by a depression above the hot runner fixed plate 2, a runner plate 7 is fixed in the hot runner installation cavity 21, a top plate 3 is installed above the hot runner fixed plate 2, and the fixed template 1, the hot runner fixed plate 2, the runner plate 7 and the top plate 3 form a mold base;

[0043] The mold base is symmetrically provided with two groups of feeding structures 6, a nozzle body 8 is installed in the middle of the lower end of the mold base, a nozzle body heater 81 is sleeved on the outside of the nozzle body 8, three groups of nozzle structures 9 which are linearly distributed and slide up and down are arranged inside the nozzle body 8, a grading mechanism 5 for driving the nozzle structure 9 to slide up and down is installed on the rear side of the fixed template 1, and a valve core lifting mechanism 4 for opening and closing the nozzle structure 9 is also installed on the upper part of the mold base.

[0044] The feeding structure 6 includes two main nozzles 62 symmetrically arranged on the top plate 3, a heating element 63 is arranged between the main nozzles 62 and the top plate 3, and positioning rings 61 are respectively installed above the two main nozzles 62;

[0045] Two groups of sealed cylinders 64 are symmetrically arranged below the fixed template 1. Side valve cores 65 are arranged on the push rods of the two groups of sealed cylinders 64. The side valve cores 65 pass through the flow channel plate 7 and extend above the inner wall of the main nozzle 62. The side valve cores 65, the flow channel plate 7 and the top of the main nozzle 62 are all sealed.

[0046] A through hole is opened at the lower end of the flow channel plate 7, which is connected to the hot runner 71 so that the side valve core 65 can extend into the main nozzle 62, and the side valve core 65 and the through hole are sealed and designed to slide, so that the valve core can move up and down under the action of the closed cylinder 64, thereby releasing the seal of the upper inlet of the main nozzle 62, allowing the material to enter the hot runner 71.

[0047] Two groups of hot runners 71 are symmetrically arranged inside the runner plate 7. The upper parts of the two groups of hot runners 71 are aligned with and abut against the outlets of the two main nozzles 62 respectively. The lower ends of the two groups of hot runners 71 are connected to the nozzle bodies 8 respectively. A heating couple for heating the material inside the hot runner 71 is also arranged inside the runner plate 7 to facilitate the material inside the main nozzle 62 to enter the hot runner 71 and then enter the nozzle structure 9. The heating couple is arranged in combination to prevent the material from solidifying, thereby facilitating the flow of the material.

[0048] A through hole is opened at the lower end of the flow channel plate 7 from bottom to top, and the through hole is connected to the hot runner 71 so that the side valve core 65 can extend into the main nozzle 62. The side valve core 65 and the through hole are sealed and designed to slide, so that the valve core can move up and down under the action of the closed cylinder 64, thereby releasing the seal of the upper inlet of the main nozzle 62, allowing the material to enter the hot runner 71.

[0049] A diverter groove 83 is provided at the top of the nozzle body 8, and the bottom end of the diverter groove 83 penetrates downward to form three groups of linearly distributed sockets. A plug-in tube 85 is plugged at the top of the socket, and the plug-in tube 85 is slid up and down and plugged into the nozzle structure 9. A guide block 82 is provided above the nozzle body 8. The guide block 82 has two groups of openings symmetrically provided on the left and right. The lower end of the opening is connected to the diverter groove 83, and the top of the nozzle body 8 is abutted against the bottom of the guide block 82. The two groups of openings on the guide block 82 are respectively aligned with the bottom outlets of the two hot runners 71 of the flow channel plate 7.

[0050] The nozzle structure 9 includes an extension tube 91 that is slidably inserted in the socket up and down, a nozzle head 92 is fixed at the bottom end of the extension tube 91, the bottom end of the nozzle head 92 passes through the nozzle body 8 and is placed below it, the lower end of the plug-in tube 85 is slidably and sealedly inserted in the extension tube 91, a main valve core 93 is slidably arranged inside the extension tube 91, the lower end of the main valve core 93 passes through the nozzle head 92 and is placed below the outside, and the main valve core 93 is sealed between the lower end of the nozzle head 92, a small outlet end is arranged at the bottom end of the nozzle head 92, the lower end of the main valve core 93 is plugged and sealed with the outlet end, thereby ensuring that the internal material will not leak in the gap between the outlet end and the main valve core 93;

[0051] A contact piece 911 is provided inside the extension tube 91. The contact piece 911 is a 1 / 4 circular structure, and the end of the contact piece 911 close to the main valve core 93 is tilted downward. A downward pressure head 933 is provided outside the main valve core 93. The downward pressure head 933 contacts the lower surface of the contact piece 911. When the nozzle structure 9 moves downward, the main valve core 93 can move downward therewith, thereby ensuring that the lower end of the valve core is still placed at the outlet end, thereby ensuring the sealing.

[0052] Two sets of lifting cavities 84 are symmetrically arranged inside the nozzle body 8, and three sets of sliding ports are opened on the inner side of the lifting cavities 84, and the three sets of sliding ports are respectively connected to the inside of the three sets of sleeve ports;

[0053] The grading mechanism 5 includes two lifting groups arranged in a circumferential array in the lifting chambers 84 on the left and right sides, each lifting group includes three lifting plates 53, and the multiple lifting plates 53 on the left and right sides are independently connected to three extension pipes 91 through support plates;

[0054] Multiple lifting plates 53 are arranged in parallel at the left and right ends, and the innermost lifting plate 53 is connected to the nozzle structure 9 close to the grading cylinder 51 through a support plate, the middle lifting plate 53 is connected to the middle nozzle structure 9 through a support plate, and the nozzle structure 9 farthest from the grading cylinder 51 is connected to the outermost lifting plate 53 through a support plate. The three groups of nozzle structures 9 can move up and down under the action of the three lifting plates 53, and can move downward as needed.

[0055] Three driving grooves of different sizes are separately arranged on the three lifting plates 53 of the same lifting group, and linear sliders 57 are arranged in the left and right lifting chambers 84 for sliding forward and backward. A lifting column 571 is arranged at one end of the linear slider 57, and the lifting column 571 extends into the driving groove and is in sliding contact with the driving groove. An extension rod 52 is connected to one of the linear sliders 57, and the other end of the extension rod 52 is connected to the push rod of the grading cylinder 51, and the grading cylinder 51 is installed on the fixed template 1;

[0056] The extension or retraction of the push rod of the grading cylinder 51 can make the movable slider move forward and backward along the lifting chamber 84, thereby making the lifting plate 53 move up and down, so that the nozzle structure 9 extends downward, and the injection molding operation can be performed;

[0057] Two groups of ejection holes 11 are provided on the fixed template 1, and the ejection holes 11 are connected to the lifting chamber 84. A driving rod 1 54 and a driving rod 2 56 are respectively provided in the two groups of ejection holes 11 for sliding back and forth, and the driving rod 1 54 and the driving rod 2 56 are respectively connected to two linear sliders 57. The driving rod 1 54 and the driving rod 2 56 are both provided with tooth grooves. A gear 55 is also rotatably installed inside the fixed template 1, and the driving rod 1 54 and the driving rod 2 56 are meshed and connected with the gear 55 through the tooth grooves.

[0058] When the grading cylinder 51 causes a linear slider 57 to move forward and backward, under the action of the driving rod 1 54, the driving rod 2 56 and the gear 55, the other linear slider 57 will move in the opposite direction, thereby causing the corresponding nozzle structure 9 to be subjected to force on both sides synchronously, making its lifting and lowering more stable.

[0059] The driving groove includes a horizontal portion 1 531 and a horizontal portion 2 533 in a linear structure, and the horizontal portion 2 533 is located above the horizontal portion 1 531. The horizontal portion 1 531 and the horizontal portion 2 533 are connected through a downward pressing portion 532 in an arc structure. In the initial state, the lifting column 571 is placed in the horizontal portion 1 531. When the lifting column 571 moves along the horizontal portion 1 531 to the downward pressing portion 532, it will cause the corresponding lifting plate 53 to move downward, thereby enabling the corresponding nozzle structure 9 to move downward. The lifting plate 53 not placed in the downward pressing portion 532 and the horizontal portion 2 533 maintains its original position unchanged.

[0060] The length of the horizontal portion 1 531 of the three driving grooves gradually increases from the inside to the outside, the size of the pressing portion 532 remains unchanged, and the length of the horizontal portion 2 533 gradually decreases. When moving, the nozzle structure 9 closest to the grading cylinder 51 moves downward first, followed by the middle nozzle structure 9.

[0061] The valve core lifting mechanism 4 includes three groups of deflection sleeves 43 distributed linearly. The three groups of deflection sleeves 43 are embedded in the flow channel plate 7, and circular holes are set through the top and bottom thereof. The inner wall of the circular hole is provided with a deflection structure 44 for deflecting the main valve core 93. The three groups of main valve cores 93 pass through the three circular holes respectively and are placed above them. The main valve core 93 is placed in the inner part of the circular hole and a deflection column 931 is provided. The deflection column 931 is slidably placed in the deflection structure 44, and the two are slidably connected;

[0062] The main valve core 93 moves downward along the deflection structure 44 when it moves downward together with the extension tube 91 and the nozzle head 92, and deflects along a specified path during the downward movement, so that the pressure head 933 is separated from the contact piece 911. At this time, the main valve core 93 can move upward, so that the main valve core 93 is separated from the outlet end of the nozzle head 92, so that the internal material can flow out of the injection molding;

[0063] A connecting cylinder 41 is installed on the top plate 3, and a connecting cover 42 is installed at the lower end of the connecting cylinder 41. The connecting cover 42 is hollow inside to form a plug-in cavity 421. Three linearly distributed notches are arranged below the connecting cover 42. Three main valve cores 93 pass through the three notches and are movably placed in the plug-in cavity 421, and a lifting plate 932 is arranged on the top of the main valve core 93.

[0064] There is a certain distance between the lifting plate 932 and the top and bottom of the plug-in chamber 421. After one or more main valve cores 93 move down a certain distance together with the nozzle structure 9, the main valve core 93 is close to the bottom end of the plug-in chamber 421, and the connecting cover 42 moves downward under the action of the connecting cylinder 41. The main valve core 93 moves upward and returns to its initial position through the lifting plate 932. At this time, the bottom end of the main valve core 93 will be separated from the outlet end of the nozzle head 92, and the remaining main valve core 93 and the nozzle structure 9 remain unchanged and the material cannot flow out of the injection molding.

[0065] The deflection structure 44 includes a downward displacement groove 441 and an upward displacement groove 443, the bottom end of the upward displacement groove 443 is below the downward displacement groove 441, and the bottom end of the downward displacement groove 441 is connected to the bottom end of the upward displacement groove 443 through a curved deflection groove 442, and a reversing groove 1 444 is arranged at a downward inclination at the connection between the bottom end of the upward displacement groove 443 and the deflection groove 442, and a reversing groove 2 445 is arranged vertically upward at one end of the reversing groove 1 444 away from the upward displacement groove 443, and the top end of the reversing groove 2 445 is connected to the deflection groove 442. The deflection sleeve 43 is a cylindrical structure, and during processing, a rectangular plate is milled out as shown in FIG. Fig. 9 The deflection structure 44 shown can then be rolled into a cylindrical structure;

[0066] The inner wall of the deflection structure 44 is tangent to the outer surface of the deflection column 931. In the initial state, the deflection column 931 is in the downward displacement groove 441, and at this time, the downward pressure head 933 is in contact with the lower surface of the contact piece 911;

[0067] When working, the grading mechanism 5 makes the nozzle structure 9 move downward, and the deflection column 931 will move along the downward groove 441 and the deflection groove 442 to the position directly below the upward groove 443 (such as Fig. 9As shown in , the nozzle structure 9 is now moved into position, and the main valve core 93 will also rotate accordingly. At this time, the lower pressure head 933 is deflected and does not contact the lower surface of the contact piece 911. At this time, the lifting plate 932 corresponding to the upper end of the main valve core 93 is close to the bottom end of the plug-in cavity 421. The connecting cylinder 41 rises to make the main valve core 93 free from the blockage of the nozzle head 92, so that it can be unloaded for injection molding. After injection molding, it descends again along the upward moving groove 443 to its bottom end to be blocked;

[0068] When resetting is required, the main valve core 93 continues to move downward and then moves upward. It will enter the flip groove 2 445 along the flip groove 1 444. When its height is consistent with the bottom height of the upward groove 443, the nozzle structure 9 and the main valve core 93 move upward together under the action of the grading cylinder 51 and the connecting cylinder 41 respectively, and the main valve core 93 is in place. During the movement, the main valve core 93 will deflect along the deflection groove 442, so that the lower pressure head 933 contacts the lower surface of the contact piece 911, and the whole returns to the initial state.

[0069] Working principle: During the injection molding operation, our existing products have three sizes: large, medium and small. In order to ensure the uniformity of flow distribution during the injection molding process, we usually select a suitable number of nozzles for injection molding according to molds of different sizes, and select a suitable number of nozzle structures 9 according to the size of the product mold. The mold is divided into three different sizes: large, medium and small according to the product size, and the three nozzle structures 9 correspond to the three sizes, so that the flow distribution of each part inside the mold is uniform during injection molding, which greatly improves the injection molding quality of the product;

[0070] When one nozzle structure 9 is used for injection molding, the power of the grading cylinder 51 is first turned on, and the push rod of the grading cylinder 51 pushes the linear slider 57 to move a certain distance. The lifting column 571 on the linear slider 57 will move along the driving groove of the innermost lifting plate 53. When it moves to the pressing portion 532, the lifting plate 53 will drive the corresponding nozzle structure 9 to move downward together. The driving grooves of the other two sets of lifting plates 53 are still in contact with the lifting column 571 through the horizontal portion 1 531, and their positions will not change.

[0071] When two or three nozzle structures 9 are needed to perform injection molding together, the lifting column 571 can be moved to the upper part of the corresponding horizontal portion 2 533 by the step cylinder 51, and the multiple nozzle structures 9 will move downward and extend together.

[0072] When the nozzle structure 9 is moving upward and extending, since the contact piece 911 in the extension tube 91 contacts the pressure head 933 on the main valve core 93, the entire part of the nozzle structure 9 will move downward together, and the deflection column 931 on the main valve core 93 is connected to the deflection structure 44, so that when the main valve core 93 moves downward, the main valve core 93 will also deflect to a certain extent. When it moves to the specified position, the pressure head 933 is deflected and does not contact the lower surface of the contact piece 911. At this time, the lifting plate 932 corresponding to the upper end of the main valve core 93 is close to the bottom end of the plug-in cavity 421. The connecting cylinder 41 rises to make the main valve core 93 free from the blockage of the nozzle head 92, so that it can be unloaded for injection molding. After injection molding, it descends to its bottom along the upward groove 443 again to be blocked.

[0073] Then, the corresponding closed cylinder 64 moves the corresponding side valve core 65 downward, and the fluid material enters the hot runner 71 through the corresponding main nozzle 62, and then enters the nozzle structure 9 for injection molding. The two main nozzles 62 can be used for injection molding with two plastics or two different colors at the same time, or one can be opened first and then the other can be opened at will;

[0074] When resetting is required, the main valve core 93 continues to move downward and then moves upward. It will enter the flip groove 2 445 along the flip groove 1 444. When its height is consistent with the bottom height of the upward groove 443, the nozzle structure 9 and the main valve core 93 move upward together under the action of the grading cylinder 51 and the connecting cylinder 41 respectively, and the main valve core 93 is in place. During the movement, the main valve core 93 will deflect along the deflection groove 442, so that the lower pressure head 933 contacts the lower surface of the contact piece 911, and the whole returns to the initial state.

[0075] By arranging three groups of independently distributed nozzle structures 9 in the mold base and cooperating with the grading mechanism 5, the three nozzle structures 9 can select the corresponding number of downward movement according to the needs, and then can contact the injection mold and perform injection molding operation on it. The three nozzle structures 9 correspond to three sizes, and then during injection molding, the flow distribution of each part inside the mold is uniform, which greatly improves the injection molding quality of the product, and there is no need to replace the nozzle when injecting molds of different sizes, which improves convenience;

[0076] By means of the grading mechanism 5, the three nozzle structures 9 can select the corresponding amount of downward movement according to the needs, and cooperate with the valve core lifting mechanism 4, which can make the main valve core 93 in the nozzle mechanism move upward, release the seal of the nozzle structure 9, so that the internal circulating material can be discharged, and injection molding can only be carried out after the nozzle structure 9 is extended upward, avoiding the collision caused by the mold base being too close to the mold.

[0077] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0078] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0079] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A multi-nozzle co-injection hot runner, characterized in that: It comprises a fixed template (1), a hot runner fixed plate (2) is installed above the fixed template (1), a hot runner fixing plate (2) is recessed above the hot runner fixing plate (2) to form a hot runner installation cavity (21), a runner plate (7) is fixed in the hot runner installation cavity (21), a top plate (3) is installed above the hot runner fixing plate (2), and the fixed template (1), the hot runner fixing plate (2), the runner plate (7), and the top plate (3) constitute a mold base; The mold base is symmetrically provided with two groups of feeding structures (6), a nozzle body (8) is installed in the middle of the lower end of the mold base, the outside of the nozzle body (8) is sleeved with a nozzle body heater (81), and the inside of the nozzle body (8) is provided with three groups of nozzle structures (9) that are linearly distributed and slide up and down. A grading mechanism (5) for driving the nozzle structure (9) to slide up and down is installed on the rear side of the fixed template (1), and a valve core lifting mechanism (4) for opening and closing the nozzle structure (9) is also installed on the upper part of the mold base.

2. The multi-nozzle co-injection hot runner according to claim 1, characterized in that: The feeding structure (6) comprises two main nozzles (62) symmetrically arranged on the top plate (3), a heating element (63) is arranged between the main nozzles (62) and the top plate (3), and positioning rings (61) are respectively installed above the two main nozzles (62); Two groups of sealed cylinders (64) are symmetrically arranged below the fixed template (1), and side valve cores (65) are arranged on the push rods of the two groups of sealed cylinders (64). The side valve cores (65) pass through the flow channel plate (7) and extend to the top of the inner wall of the main nozzle (62), and the side valve cores (65) are sealed with the flow channel plate (7) and the top of the main nozzle (62).

3. The multi-nozzle co-injection hot runner according to claim 2, characterized in that: Two groups of hot runners (71) are symmetrically arranged inside the flow channel plate (7), the upper ends of the two groups of hot runners (71) are respectively aligned with and abut against the outlets of the two main nozzles (62), the lower ends of the two groups of hot runners (71) are respectively connected to the nozzle body (8), and a heating couple for heating the material inside the hot runner (71) is also arranged inside the flow channel plate (7).

4. The multi-nozzle co-injection hot runner according to claim 1, characterized in that: The top of the nozzle body (8) is provided with a flow dividing groove (83), the bottom of the flow dividing groove (83) penetrates downward to form three groups of linearly distributed sockets, the upper part of the socket is plugged with a plug-in tube (85), the plug-in tube (85) is slidably plugged into the inside of the nozzle structure (9) up and down, and a guide block (82) is provided above the nozzle body (8), the guide block (82) is symmetrically provided with two groups of openings, the lower end of the opening is connected to the flow dividing groove (83), and the upper part of the nozzle body (8) is in contact with the lower part of the guide block (82).

5. The multi-nozzle co-injection hot runner according to claim 4, characterized in that: The nozzle structure (9) comprises an extension tube (91) which is inserted into the socket in a sliding manner up and down, a nozzle head (92) is fixed to the bottom end of the extension tube (91), the bottom end of the nozzle head (92) passes through the nozzle body (8) and is placed below it, the lower end of the insertion tube (85) is inserted into the extension tube (91) in a sliding and sealing manner, a main valve core (93) is provided inside the extension tube (91) in a sliding manner up and down, the lower end of the main valve core (93) passes through the nozzle head (92) and is placed below the outside thereof, and a sealing arrangement is provided between the main valve core (93) and the lower end of the inside of the nozzle head (92); A contact piece (911) is arranged inside the extension tube (91), and the contact piece (911) is a 1 / 4 circular structure, and one end of the contact piece (911) close to the main valve core (93) is designed to be tilted downward, and a pressure head (933) is arranged outside the main valve core (93), and the pressure head (933) is in contact with the lower surface of the contact piece (911).

6. The multi-nozzle co-injection hot runner according to claim 5, characterized in that: Two groups of lifting cavities (84) are symmetrically arranged inside the nozzle body (8), and three groups of sliding openings are opened on the inner side of the lifting cavities (84), and the three groups of sliding openings are respectively connected to the inside of the three groups of sleeve ports; The grading mechanism (5) comprises two groups of lifting groups arranged in a circumferential array in the lifting chambers (84) on the left and right sides, each group of the lifting groups comprises three lifting plates (53), and the plurality of lifting plates (53) on the left and right sides are independently connected to three extension pipes (91) via support plates respectively; A plurality of lifting plates (53) are arranged in parallel at the left and right ends, and the innermost lifting plate (53) is connected to the nozzle structure (9) close to the grading cylinder (51) through a support plate, the middle lifting plate (53) is connected to the middle nozzle structure (9) through a support plate, and the nozzle structure (9) farthest from the grading cylinder (51) is connected to the outermost lifting plate (53) through a support plate; Three driving grooves of different sizes are separately arranged on the three lifting plates (53) of the same lifting group, and linear sliders (57) are arranged in the lifting chambers (84) of the left and right groups to slide forward and backward. A lifting column (571) is arranged at one end of the linear slider (57) facing inward, and the lifting column (571) extends into the driving groove and is in sliding contact with the driving groove. An extension rod (52) is connected to one of the linear sliders (57), and the other end of the extension rod (52) is connected to the push rod of the grading cylinder (51), and the grading cylinder (51) is installed on the fixed template (1); The fixed template (1) is provided with two groups of ejection holes (11), and the ejection holes (11) are communicated with the lifting chamber (84). A driving rod (54) and a driving rod (56) are respectively slidably arranged in the two groups of ejection holes (11), and the driving rod (54) and the driving rod (56) are respectively connected to two linear sliders (57). The driving rod (54) and the driving rod (56) are both provided with tooth grooves. A gear (55) is also rotatably installed inside the fixed template (1), and the driving rod (54) and the driving rod (56) are meshed and connected with the gear (55) through the tooth grooves.

7. The multi-nozzle co-injection hot runner according to claim 6, characterized in that: The driving groove comprises a horizontal portion 1 (531) and a horizontal portion 2 (533) in a straight structure, and the horizontal portion 2 (533) is located above the horizontal portion 1 (531), and the horizontal portion 1 (531) and the horizontal portion 2 (533) are connected via a downward pressing portion (532) in an arc structure, and in an initial state, the lifting column (571) is placed in the horizontal portion 1 (531); The length of the horizontal portion (531) of the three driving grooves gradually increases from the inside to the outside.

8. The multi-nozzle co-injection hot runner according to claim 5, characterized in that: The valve core lifting mechanism (4) comprises three groups of deflection sleeves (43) distributed in a linear manner. The three groups of deflection sleeves (43) are all embedded in the flow channel plate (7), and circular holes are provided through the top and bottom of the deflection sleeves. The inner wall of the circular hole is provided with a deflection structure (44) for deflecting the main valve core (93). The three groups of main valve cores (93) pass through the three circular holes respectively and are placed above them. The main valve core (93) is placed in the inner part of the circular hole and is provided with a deflection column (931). The deflection column (931) is slidably placed in the deflection structure (44), and the two are slidably connected; A connecting cylinder (41) is installed on the top plate (3), and a connecting cover (42) is installed at the lower end of the connecting cylinder (41). The interior of the connecting cover (42) is hollow to form a plug-in cavity (421). Three linearly distributed notches are arranged below the connecting cover (42). The three main valve cores (93) respectively pass through the three notches and are movably placed in the plug-in cavity (421), and a lifting plate (932) is arranged on the top of the main valve core (93).

9. The multi-nozzle co-injection hot runner according to claim 8, characterized in that: The deflection structure (44) comprises a downwardly directed downwardly directed downwardly directed downwardly directed downwardly directed downwardly directed downwardly directed downwardly directed downwardly directed downwardly directed downwardly directed downwardly directed downwardly directed downwardly directed downwardly directed upward ... The inner wall of the deflection structure (44) is tangent to the outer surface of the deflection column (931). In the initial state, the deflection column (931) is in the downward displacement groove (441), and at this time, the downward pressure head (933) is in contact with the lower surface of the contact piece (911).

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