Precise control mechanism for single-nozzle multi-sprue needle valve hot runner

Abstract

The invention belongs to the technical field of injection molding, and particularly relates to a single-nozzle multi-sprue needle valve hot runner precision control mechanism which comprises a hot runner plate, an air cylinder assembly and a hot nozzle assembly, the hot runner plate comprises a first base plate and a second base plate which are stacked front and back, and the hot nozzle assembly comprises a main nozzle installed on the first base plate and a hot nozzle body installed on the second base plate; a first hot flow channel is formed in the main injection nozzle, a plurality of second hot flow channels are formed in the hot nozzle body, the air cylinder assembly comprises a piston and a valve needle, the piston drives the valve needle to slide in a nozzle core guide of the hot nozzle body to achieve glue sealing, and meanwhile melt is guided into a mold cavity. Through the arrangement of the second heat flow channel, the conventional splitter plate and the hot nozzle body are integrated, and through the integrated design, the functions of melt splitting and multi-cavity injection molding of the single hot nozzle body are achieved at the same time, the number of assembly interfaces of components is reduced, and the cost is effectively reduced while the system reliability is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of injection molding, in particular to a single-nozzle multi-gate needle valve hot runner precision control mechanism. BACKGROUND

[0002] Waste plastics can reduce environmental pollution and save resources through efficient recycling and reprocessing. Reprocessing can melt the treated waste plastics through an injection molding machine and inject them into a mold to form new products. The needle valve hot runner control mechanism is a key component in the injection molding machine for precisely controlling the injection of molten plastic. The precise opening and closing of the valve needle controls the timing, speed, and flow of molten material into the mold cavity.

[0003] A patent application with publication number CN105619716A discloses a valve needle type hot runner system, which includes a flow divider plate, a valve needle guide sleeve and a nozzle mounted on the flow divider plate, a valve needle inserted into the valve needle guide sleeve and the nozzle, a valve needle driver mounted on the valve needle, which can drive the valve needle to move back and forth along the axial direction, a main body mounted on the valve needle guide sleeve, and a heat-conducting wing plate mounted on the main body. The valve needle is precisely driven by the valve needle driver to move back and forth, thereby controlling the opening and closing of the nozzle. When the valve needle retreats, the nozzle opens, and the molten plastic enters the mold cavity under the action of injection pressure, completing the injection molding process. When the injection is completed, the valve needle moves forward to close the nozzle, cutting off the flow of molten material.

[0004] In the injection molding process, the valve needle type hot runner system usually adopts a multi-nozzle cooperative working mode. The molten plastic first enters the flow divider plate through the injection nozzle of the injection molding machine, is evenly distributed by the flow divider plate, and is then delivered to each independently controlled nozzle unit. Each nozzle is equipped with a precise valve needle driving mechanism. By coordinating the reciprocating motion of each valve needle, the synchronous or sequential opening and closing of multiple nozzles is achieved. However, this technology requires the integration of multiple nozzles, which is costly and has a complex overall structure with a large volume. This not only requires the mold size to be correspondingly enlarged to accommodate the installation space of the hot runner system, but also increases the mold manufacturing cost.

[0005] Therefore, the present application provides a single-nozzle multi-gate needle valve hot runner precision control mechanism. SUMMARY

[0006] To make up for the shortcomings of the prior art and solve at least one technical problem raised in the background art.

[0007] The technical scheme adopted by the present application to solve its technical problems is: a single nozzle multi-gate needle valve hot runner precision control mechanism, comprising a hot runner plate, a cylinder assembly and a hot nozzle assembly, the hot runner plate comprises front and rear stacked base plate one and base plate two, the hot nozzle assembly comprises a main nozzle mounted on the base plate one, the cylinder assembly comprises a valve needle, the hot nozzle assembly further comprises: a hot nozzle body mounted on the base plate two, the valve needle is in sliding connection with the hot nozzle body; a plurality of valve needles are installed on the hot nozzle body, the valve needle contains a plurality of valve needles, each valve needle is respectively guided to control the opening and closing of the corresponding nozzle core; a hot flow channel one is opened in the main nozzle; a plurality of hot flow channels two are opened in the hot nozzle body, one end of the hot flow channel two is in communication with the hot flow channel one, the other end of the hot flow channel two is in communication with the nozzle core, and the main nozzle uniformly introduces the melted waste plastic into the plurality of nozzle cores through the hot flow channel one and the hot flow channel two.

[0008] Preferably, the cylinder assembly further comprises: a push plate for controlling the movement of the plurality of valve needles; a cylinder for driving the push plate to move, the cylinder comprises a piston inside for reciprocating movement, and the push plate is fixedly connected with the piston of the cylinder.

[0009] Preferably, the mechanism further comprises: a through hole opened in the base plate one, the valve needle penetrates through the through hole and is connected with the push plate, and the push plate is arranged outside the non-heating area of the base plate one; a valve needle sleeve is mounted on the hot nozzle body, the valve needle sleeve is in sliding connection with the valve needle, and the top end surface of the valve needle sleeve and the bottom surface of the through hole of the base plate one form a sealing fitting surface.

[0010] Preferably, the hot nozzle assembly further comprises a first heating wire wound on the main nozzle and a second heating wire wound on the hot nozzle body, the first heating wire and the second heating wire are used to maintain the flowability of the molten plastic, and the heating range of the second heating wire covers the nozzle core.

[0011] Preferably, the cylinder assembly further comprises: a connecting plate mounted on the push plate; a pressing plate fixedly mounted on the connecting plate, the valve needle is located below the pressing plate, and the connecting plate and the pressing plate jointly drive the valve needle to move up and down.

[0012] Preferably, the connecting plate is in front and rear sliding connection with the push plate, the cylinder assembly further comprises a sliding plate slidingly mounted on the push plate, the sliding plate is provided with a sliding groove, the connecting plate is provided with a connecting block, the sliding plate drives the connecting plate to move forward and backward through the sliding groove and the connecting block, a mounting seat is fixedly mounted on the push plate, a threaded rod for driving the sliding plate to move is rotatably mounted on the mounting seat.

[0013] Preferably, the connecting block is cylindrical, and the connecting block is rotatably connected to the connecting plate.

[0014] Preferably, the mechanism further comprises: a mounting shell fixedly mounted on the base plate; a magnetic bar fixedly mounted on the push plate; a first disc rotatably mounted on the mounting shell, the magnetic bar being used to drive the first disc to rotate, the first disc being provided with a first ratchet; an intermittent transmission structure mounted on the mounting shell; a second ratchet rotatably mounted on the mounting shell, the first disc driving the second ratchet to rotate through the intermittent transmission structure, the second ratchet being provided with a protrusion, a torsional spring one being mounted between the second ratchet and the mounting shell; a second disc mounted on the mounting shell, the second disc being provided with a first switch, the first switch being located in the moving range of the protrusion; a supporting rod fixedly mounted on the mounting shell, the supporting rod being rotatably provided with two pawls, the pawls being used to drive the first ratchet and the second ratchet to drive in one direction.

[0015] Preferably, the push plate is provided with a second switch, the supporting rod adopts a telescopic structure, and the second switch is used to control the supporting rod to extend or retract after being triggered.

[0016] Preferably, the second disc is provided with a protruding block, the protruding block is located in the moving range of the protrusion, the second disc is rotatably connected to the mounting shell, and a torsional spring two is mounted between the second disc and the mounting shell.

[0017] The beneficial effects of the present application are as follows:

[0018] 1. The single-nozzle multi-gate needle valve hot runner precision control mechanism, through the arrangement of the second hot flow channel, combines the conventional flow distribution plate and the hot nozzle body into one, the integrated design realizes the functions of melt flow distribution and multi-cavity injection molding of a single hot nozzle body, reduces the number of components and assembly interfaces, improves the system reliability, effectively reduces the cost, effectively reduces the installation space required by the mold, optimizes the size of the mold, further reduces the cost, and integrates the function of the flow distribution plate into the hot nozzle body, thereby reducing the connection interface between the traditional flow distribution plate and the hot nozzle body, combining part of the heating area, and reducing the redundant heating group number.

[0019] 2. The single-nozzle multi-gate needle valve hot runner precision control mechanism, through the arrangement of the push plate, for small multi-cavity plastic products, only one air cylinder is needed to control all the valve needles at the same time, thereby reducing the size and processing difficulty of the mold, reducing the manufacturing cost of the mold, and making the entire system simple and easy to install. At the same time, the air cylinder is external, avoiding the heat aging of the rubber ring inside, making the air cylinder more stable and durable, and increasing the number of corresponding air cylinders to increase the thrust according to the required thrust.

[0020] 3. The single nozzle multi-gate needle valve hot runner precision control mechanism according to the present application, by setting the second heating wire close to the front end, the temperature at the gate can be effectively guaranteed, and it is especially suitable for high temperature materials and sensitive glue materials.

[0021] 4. The single nozzle multi-gate needle valve hot runner precision control mechanism according to the present application, by externally arranging the push plate and cooperating with the pressing plate, when the valve needle needs to be maintained, only the pressing plate needs to be removed from the connecting plate, without disassembling the entire cylinder, the maintenance is convenient, and cooperating with the sliding plate, when the valve needle is worn due to long time use, the relative distance between the push plate and the valve needle can be adjusted to realize compensation for wear.

[0022] 5. The single nozzle multi-gate needle valve hot runner precision control mechanism according to the present application, by the ratchet and intermittent transmission structure, the number of actions of the valve needle is recorded in real time, before the critical failure of the sealing performance of the valve needle, active maintenance is reminded to avoid sudden leakage in the production process and reduce the waste rate, and cooperating with the protruding block, if the maintenance is not in time, the first ratchet forces the second disc to be linked, so that the alarm signal is continuously locked. BRIEF DESCRIPTION OF DRAWINGS

[0023] The present application will be further described below in combination with the drawings.

[0024] Figure 1 is the sectional view of the cylinder assembly and the hot nozzle assembly of the present application;

[0025] Figure 2 is the position schematic view of the hot flow channel one and the hot flow channel two of the present application;

[0026] Figure 3 is Figure 1 is the local enlarged view of A in the present application;

[0027] Figure 4 is the sectional view of the push plate of the present application;

[0028] Figure 5 is the sectional view of the installation shell of the present application;

[0029] In the diagram: 1. Cylinder assembly; 11. Valve needle; 12. Push plate; 13. Cylinder; 14. Connecting plate; 15. Pressure plate; 16. Slide plate; 17. Slide groove; 18. Connecting block; 19. Mounting base; 110. Bolt; 120. Threaded rod; 2. Hot nozzle assembly; 21. Hot nozzle body; 22. Nozzle core; 23. Hot flow channel one; 24. Hot flow channel two; 25. First heating wire; 26. Second heating wire; 27. Main nozzle; 3. Base plate one; 4. Base plate two; 5. Through hole; 6. Valve needle sleeve; 7. Mounting shell; 8. Magnetic rod; 9. No. 1 disc; 10. Intermittent transmission structure; 101. No. 2 ratchet; 102. No. 2 disc; 103. No. 1 switch; 104. Support rod; 105. No. 2 switch; 106. Protrusion; 107. Pawl; 108. No. 1 ratchet. Detailed Implementation

[0030] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0031] like Figures 1-5 As shown in the figure, a single-nozzle multi-gate needle valve hot runner precision control mechanism of the present invention includes a hot runner plate, a cylinder assembly 1, and a hot nozzle assembly 2. The hot runner plate includes a first base plate 3 and a second base plate 4 stacked front and rear. The hot nozzle assembly 2 includes a main nozzle 27 mounted on the first base plate 3. The cylinder assembly 1 includes a valve needle 11. The hot nozzle assembly 2 further includes a hot nozzle body 21 mounted on the second base plate 4, with the valve needle 11 slidably connected to the hot nozzle body 21; and a plurality of nozzles mounted on the hot nozzle body 21. The nozzle core 22 contains several valve needles 11, each valve needle 11 guiding and controlling the opening and closing of the corresponding nozzle core 22; a first heat flow channel 23 is opened in the main nozzle 27; several second heat flow channels 24 are provided in the hot nozzle body 21, one end of the second heat flow channel 24 is connected to the first heat flow channel 23, and the other end of the second heat flow channel 24 is connected to the nozzle core 22. The main nozzle 27 melts the waste plastic through the first heat flow channel 23 and the second heat flow channel 24 and evenly introduces it into several nozzle cores 22.

[0032] Specifically, in the injection molding process, the existing valve needle 11 type hot runner system usually adopts the method of hot nozzle body 21 working together. The molten plastic first enters the manifold through the main nozzle 27 of the injection molding machine. After being evenly distributed by the manifold, it is delivered to each independently controlled hot nozzle body 21. Each hot nozzle body 21 is equipped with a precision valve needle 11 drive mechanism. By coordinating and controlling the reciprocating motion of each valve needle 11, the synchronous or sequential opening and closing of multiple hot nozzle bodies 21 can be achieved. However, this technology requires the integration of multiple hot nozzle bodies 21, which is costly and has a relatively complex overall structure and large volume. This not only requires the mold size to be increased accordingly to accommodate the installation space of the hot runner system, but also increases the manufacturing cost of the mold.

[0033] In the injection molding process, the molten plastic first passes through the hot flow channel one 23 of the main nozzle 27, and then is uniformly distributed to the plurality of hot flow channels two 24 of the nozzle body 21, which deliver the melt to the entrances of the nozzle cores 22, the control valve needle 11 retracts to open the nozzle core 22 discharge port, and the melt fills the mold cavity under the action of injection pressure, after the pressure holding is completed, the control valve needle 11 extends to completely close the nozzle core 22 discharge port, realizing accurate cutting of the melt flow to prevent drooling and material degradation;

[0034] By providing the hot flow channel two 24, the conventional distribution plate and the nozzle body 21 are integrated, the integrated design realizes the functions of melt distribution and multi-cavity injection molding of a single nozzle body 21, reduces the number of components and assembly interfaces, improves the system reliability while effectively reducing the cost, the integrated structure effectively reduces the installation space required by the mold, optimizes and reduces the size of the mold, further reduces the cost, and integrates the function of the distribution plate into the nozzle body 21, reduces the connection interface between the traditional distribution plate and the nozzle body 21, thereby merging part of the heating area and reducing the number of redundant heating groups.

[0035] As shown in Figure 1 The cylinder assembly 1 further comprises a push plate 12 for controlling the movement of the plurality of valve needles 11, and a cylinder 13 for driving the movement of the push plate 12, the cylinder 13 comprising a piston inside for reciprocating movement, and the push plate 12 is fixedly connected with the piston of the cylinder 13.

[0036] Specifically, in the injection molding of small multi-cavity plastic products, when the valve needle 11 type glue injection system is used, each glue discharge port needs to be equipped with an independent cylinder 13 control mechanism, and the traditional cylinder 13 is limited by the minimum size and cannot be further miniaturized, resulting in the forced enlargement of the overall size of the mold to meet the installation space requirements of these control elements. The size enlargement phenomenon caused by the volume limitation of the cylinder 13 not only increases the material consumption and processing difficulty of the mold, but also significantly increases the manufacturing cost of the mold;

[0037] In operation, the cylinder 13 drives the piston to reciprocate by alternating intake, the piston drives the push plate 12 to reciprocate forward and backward, the push plate 12 drives the valve needle 11 to reciprocate forward and backward, and the valve needle 11 controls the opening and closing of the nozzle core 22. By providing the push plate 12, only one cylinder 13 is needed to control all valve needles 11, which improves the above problems and makes the entire system simple and easy to install.

[0038] As shown in Figures 1-2As shown, the mechanism further comprises a through hole 5 opened on the first substrate 3, the valve needle 11 penetrates through the through hole 5 and is connected with the push plate 12, the push plate 12 is arranged on the outside of the first substrate 3 in the non-heating area, a valve needle sleeve 6 is installed on the hot nozzle body 21, the valve needle sleeve 6 is in sliding connection with the valve needle 11, and the top end face of the valve needle sleeve 6 forms a sealing fit surface with the bottom face of the through hole 5 of the first substrate 3.

[0039] Specifically, the push plate 12 is arranged on the outside, so that the air cylinder 13 can be externally arranged, the air cylinder 13 can be away from the heater, the rubber ring inside the air cylinder 13 can be prevented from being heated and aged, the air cylinder 13 is more stable and durable, and the number of air cylinders 13 corresponding to the required thrust can be increased to increase the thrust.

[0040] As shown in the Figure 1 , the hot nozzle assembly 2 further comprises a first heating wire 25 wound on the main nozzle 27 and a second heating wire 26 wound on the hot nozzle body 21, and the first heating wire 25 and the second heating wire 26 are used to maintain the fluidity of the molten plastic, and the heating range of the second heating wire 26 covers the nozzle core 22.

[0041] Specifically, the second heating wire is close to the front end, which can effectively ensure the temperature accuracy of the gate, and is particularly suitable for high-temperature materials and sensitive rubber materials.

[0042] As shown in the Figure 1 and Figure 3 , the air cylinder assembly 1 further comprises a connecting plate 14 installed on the push plate 12, and a pressing plate 15 fixedly installed on the connecting plate 14, the valve needle 11 is located below the pressing plate 15, and the connecting plate 14 and the pressing plate 15 jointly drive the valve needle 11 to move up and down.

[0043] Specifically, in the hot runner system, the valve needle 11 may be bent, worn, strained and the like due to long-term use or uneven stress, which affects the sealing performance and injection precision. In the traditional design, the valve needle 11 is directly and rigidly connected with the piston rod of the air cylinder 13, so that the air cylinder 13 needs to be disassembled during maintenance, and the operation is complex. Through the arrangement of the pressing plate 15, when the valve needle 11 needs to be maintained, the pressing plate 15 can be simply taken off from the connecting plate 14, and the maintenance is convenient.

[0044] As shown in the Figure 1 , Figure 3 and Figure 4 , the connecting plate 14 and the push plate 12 are in sliding connection front and back, the air cylinder assembly 1 further comprises a sliding plate 16 slidingly installed on the push plate 12, the sliding plate 16 is provided with a sliding groove 17, the connecting plate 14 is provided with a connecting block 18, the sliding plate 16 drives the connecting plate 14 to move front and back through the sliding groove 17 and the connecting block 18, the push plate 12 is fixedly installed with a mounting seat 19, and the mounting seat 19 is rotatably installed with a threaded rod 120 for driving the sliding plate 16 to move.

[0045] Specifically, when the valve needle 11 is worn due to long-term use, the existing drive cylinder 13 slides forward and backward to realize compensation, the cylinder 13 mounting shell 7 or slide rail has flexibility and is easy to vibrate and deform, resulting in a decrease in positioning accuracy of the valve needle 11, and the existing technology adopts a direct forward and backward adjustment mode of the threaded rod 120, and the threaded pair is easy to wear; when the valve needle 11 is worn due to long-term use, the threaded rod 120 can be rotated to drive the sliding plate 16 to move, the sliding plate 16 moves to drive the connecting block 18 and the sliding groove 17 to drive the connecting plate 14 to move forward and backward, the connecting plate 14 moves to drive the valve needle 11 to move synchronously, and the wear is compensated; after the adjustment is completed, the sliding plate 16 and the push plate 12 are fixed by the bolt 110; the full-rigid transmission chain eliminates the elastic deformation inherent in the pneumatic system, the upward and downward movement of the sliding plate 16 is converted into the forward and backward movement of the valve needle 11 through the inclined sliding groove 17, the force flow path does not pass through the threaded pair, there is no threaded wear problem, and meanwhile, the single cylinder 13 of the application can control all the valve needles 11, and different valve needles 11 can be adjusted.

[0046] As shown in Figure 4 , the connecting block 18 is in the form of a cylinder, and the connecting block 18 is rotationally connected with the connecting plate 14.

[0047] Specifically, by setting the connecting block 18 in the form of rotation, the connecting block 18 rotates in the sliding groove 17 during the movement of the sliding plate 16, effectively reducing the loss caused by friction and ensuring the accuracy of adjustment.

[0048] As shown in Figure 1 and Figure 5 , the mechanism further comprises: a mounting shell 7 fixedly installed on the base plate 1; a magnetic bar 8 fixedly installed on the push plate 12; a first disc 9 rotationally installed on the mounting shell 7, the magnetic bar 8 being used to drive the first disc 9 to rotate, the first disc 9 being provided with a first ratchet wheel 108; an intermittent transmission structure 10 installed on the mounting shell 7; a second ratchet wheel 101 rotationally installed on the mounting shell 7, the disc being driven by the intermittent transmission structure 10 to rotate the second ratchet wheel 101, the second ratchet wheel 101 being provided with a protrusion, and a torsional spring one being installed between the second ratchet wheel 101 and the mounting shell 7; a second disc 102 installed on the mounting shell 7, the second disc 102 being provided with a first switch 103, and the first switch 103 being located within the moving range of the protrusion; a support rod 104 fixedly installed on the mounting shell 7, the support rod 104 being rotationally provided with two pawls 107, and the pawls 107 being used to limit the one-way rotation of the first ratchet wheel 108 and the second ratchet wheel 101.

[0049] As shown in Figure 1 and Figure 5 , the push plate 12 is provided with a second switch 105, the support rod 104 adopts a telescopic structure, and the second switch 105 is used to control the telescopic expansion of the support rod 104 after being triggered.

[0050] As Figure 1 and Figure 5 As shown in the figure, the second disc 102 is provided with a protrusion 106, the protrusion 106 is located in the moving range of the protrusion, the second disc 102 is rotatably connected with the mounting shell 7, and the torsional spring two is installed between the second disc 102 and the mounting shell 7.

[0051] Specifically, the intermittent transmission structure 10 is composed of a plurality of complete gears and incomplete gears, the second switch 105 is located in the moving range of the bolt 110, the rotation of the magnetic rod 8 and the first disc 9 is realized through spiral magnetic field coupling, when the magnetic rod 8 moves forward and backward, the spiral magnetic field forces the first disc 9 to rotate, and the first disc 9 can only rotate in one direction due to the arrangement of the first ratchet 108 and the pawl 107; When the push plate 12 and the valve needle 11 move forward and backward under the action of the cylinder 13, the magnetic rod 8 moves forward and backward synchronously, driving the first disc 9 to rotate, and the first disc 9 drives the second ratchet 101 to rotate through the intermittent transmission structure 10, when the valve needle 11 is used for several times, the protrusion on the second ratchet 101 contacts the first switch 103, the first switch 103 is triggered, and the signal is transmitted to the worker, so that maintenance can be carried out before the valve needle 11 cannot close the orifice core 22, and the bolt 110 needs to be removed during maintenance, and the slide plate 16 is moved, after the bolt 110 is removed, the second switch 105 is triggered, the second switch 105 controls the extension and retraction of the supporting rod 104, so that the second ratchet 101 is reset, if the worker does not handle it in time, after the protrusion on the second ratchet 101 triggers the first switch 103, the protrusion contacts the protrusion 106, the second ratchet 101 rotates subsequently, and the second disc 102 is driven to rotate by the protrusion and the protrusion 106, so that the first switch 103 is always in the triggered state, until the worker maintains the valve needle 11, and the bolt 110 needs to be removed during maintenance, so that the second switch 105 is triggered, so that the second ratchet 101 and the second disc 102 can be reset.

[0052] Working principle: in the process of small multi-cavity plastic product injection molding, the molten plastic first passes through the hot flow channel one 23 of the main nozzle 27, and then is uniformly distributed to the plurality of hot flow channels two 24 of the nozzle body 21, which deliver the melt to the inlet of each nozzle core 22, the control cylinder 13 works, the cylinder 13 drives the piston to reciprocate by alternating air intake, the piston drives the push plate 12 to move back and forth, the push plate 12 moves to drive the valve needle 11 to move back and forth, the valve needle 11 retreats to open the nozzle core 22 discharge port, the melt fills the mold cavity under the action of injection pressure, after the pressure holding is finished, the valve needle 11 extends to completely close the nozzle core 22 discharge port, realizing accurate cutting of the melt flow to prevent drooling and material degradation; when the cylinder 13 drives the push plate 12 and the valve needle 11 to move back and forth during work, the magnetic bar 8 moves back and forth synchronously, driving the first disc 9 to rotate, the first disc 9 drives the second ratchet wheel 101 to rotate through the intermittent transmission structure 10, when the valve needle 11 is used for several times, the protrusions on the second ratchet wheel 101 contact the first switch 103, the first switch 103 is triggered to transmit a signal to the worker to maintain before the valve needle 11 cannot close the nozzle core 22, during maintenance, the bolt 110 needs to be removed, the threaded rod 120 is rotated to drive the sliding plate 16 to move, the sliding plate 16 moves to drive the connecting plate 14 to move back and forth through the connecting block 18 and the sliding groove 17, the connecting plate 14 moves to drive the valve needle 11 to move synchronously to compensate for wear, after adjustment is finished, the sliding plate 16 and the push plate 12 are fixed again through the bolt 110, after the bolt 110 is removed, the second switch 105 is triggered, the second switch 105 controls the branch rod 104 to extend and retract, so that the second ratchet wheel 101 is reset, if the worker does not handle in time, after the protrusions on the second ratchet wheel 101 trigger the first switch 103, the protrusions contact the protrusions 106, the second ratchet wheel 101 rotates subsequently, the protrusions drive the second disc 102 to rotate, so that the first switch 103 is always in the triggered state, until the worker maintains the valve needle 11, during maintenance, the bolt 110 needs to be removed, then the second switch 105 is triggered, so that the second ratchet wheel 101 and the second disc 102 can be reset.

[0053] The basic principles, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A single nozzle multi-gate needle valve hot runner precision control mechanism, comprising a hot runner plate, a cylinder assembly (1) and a hot nozzle assembly (2), the hot runner plate comprising a front and rear superimposed base plate one (3) and base plate two (4), the hot nozzle assembly (2) comprising a main nozzle (27) mounted on the base plate one (3), the cylinder assembly (1) comprising a valve needle (11), characterized in that: The hot nozzle assembly (2) further comprises: A hot nozzle body (21) mounted on the base plate two (4), the valve needle (11) is in sliding connection with the hot nozzle body (21); A plurality of nozzle cores (22) mounted on the hot nozzle body (21), the valve needle (11) contains a plurality of, each valve needle (11) is respectively oriented to control the opening and closing of the corresponding nozzle core (22); A hot flow channel one (23) opened in the main nozzle (27); A plurality of hot flow channel two (24) provided in the hot nozzle body (21), one end of the hot flow channel two (24) is in communication with the hot flow channel one (23), the other end of the hot flow channel two (24) is in communication with the nozzle core (22), the main nozzle (27) uniformly guides the melted waste plastic into a plurality of nozzle cores (22) through the hot flow channel one (23) and the hot flow channel two (24).

2. A single nozzle multi-gate needle valve hot runner precision control mechanism according to claim 1, characterized in that: The cylinder assembly (1) further comprises: A push plate (12) for controlling the movement of a plurality of valve needles (11); A cylinder (13) for driving the movement of the push plate (12), the cylinder (13) contains a piston inside for reciprocating motion, and the push plate (12) is fixedly connected with the piston of the cylinder (13).

3. A precision control mechanism for a single nozzle multi-gate pin valve hot runner according to claim 2, wherein: The mechanism further comprises: A through hole (5) opened in the base plate one (3), the valve needle (11) penetrates the through hole (5) and is connected with the push plate (12), and the push plate (12) is arranged on the outside of the base plate one (3) in a non-heating area; A valve needle sleeve (6) mounted on the hot nozzle body (21), the valve needle sleeve (6) is in sliding connection with the valve needle (11), and the top end surface of the valve needle sleeve (6) forms a sealing surface with the bottom surface of the through hole (5) of the base plate one (3).

4. A single nozzle multi-gate needle valve hot runner precision control mechanism according to claim 1, characterized in that: The hot nozzle assembly (2) further comprises a first heating wire (25) wound around the main nozzle (27) and a second heating wire (26) wound around the hot nozzle body (21), the first heating wire (25) and the second heating wire (26) are used to maintain the fluidity of the molten plastic, and the heating range of the second heating wire (26) covers the nozzle core (22).

5. A single nozzle multi-gate needle valve hot runner precision control mechanism according to claim 2, characterized in that: The cylinder assembly (1) further comprises: A connecting plate (14) mounted on the push plate (12); A pressing plate (15) fixedly mounted on the connecting plate (14), the valve needle (11) is located below the pressing plate (15), and the connecting plate (14) and the pressing plate (15) jointly drive the valve needle (11) to move up and down.

6. A single nozzle multi-gate needle valve hot runner precision control mechanism according to claim 5, characterized in that: The connecting plate (14) is in sliding connection with the push plate (12) in front and back, the air cylinder assembly (1) further comprises a sliding plate (16) slidingly installed on the push plate (12), a sliding groove (17) is arranged on the sliding plate (16), a connecting block (18) is arranged on the connecting plate (14), the sliding plate (16) drives the connecting plate (14) to move in front and back through the sliding groove (17) and the connecting block (18), a mounting seat (19) is fixedly installed on the push plate (12), and a threaded rod (120) for driving the sliding plate (16) to move is rotatably installed on the mounting seat (19).

7. A single nozzle multi-gate needle valve hot runner precision control mechanism according to claim 6, characterized in that: The connecting block (18) is in the shape of a cylinder, and the connecting block (18) is in rotary connection with the connecting plate (14).

8. A single nozzle multi-gate needle valve hot runner precision control mechanism according to claim 2, characterized in that: The mechanism further comprises: A mounting shell (7) fixedly installed on the base plate (3); A magnetic bar (8) fixedly installed on the push plate (12); A first disc (9) rotatably installed on the mounting shell (7), the magnetic bar (8) is used for driving the first disc (9) to rotate, and the first disc (9) is provided with a first ratchet wheel (108); An intermittent transmission structure (10) installed on the mounting shell (7); A second ratchet wheel (101) rotatably installed on the mounting shell (7), the first disc (9) drives the second ratchet wheel (101) to rotate through the intermittent transmission structure (10), the second ratchet wheel (101) is provided with a protrusion, and a torsion spring one is installed between the second ratchet wheel (101) and the mounting shell (7); A second disc (102) installed on the mounting shell (7), the second disc (102) is provided with a first switch (103), and the first switch (103) is located in the movement range of the protrusion; A supporting rod (104) fixedly installed on the mounting shell (7), two pawls (107) are rotatably arranged on the supporting rod (104), and the pawls (107) are used for driving the first ratchet wheel (108) and the second ratchet wheel (101) to drive in one direction.

9. A precision control mechanism for a single nozzle multi-gate pin valve hot runner according to claim 8, wherein: A second switch (105) is arranged on the push plate (12), the supporting rod (104) adopts a telescopic structure, and the second switch (105) is used for controlling the supporting rod (104) to telescope after being triggered.

10. A precision control mechanism for a single nozzle multi-gate pin valve hot runner according to claim 9, wherein: The second disc (102) is provided with a protruding block (106), the protruding block (106) is located in the movement range of the protrusion, the second disc (102) is in rotary connection with the mounting shell (7), and a torsion spring two is installed between the second disc (102) and the mounting shell (7).

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