Hot runner system

Abstract

The utility model provides a hot runner system. The hot runner system comprises a mold panel, a splitter plate, an air cylinder, a hot nozzle assembly and a pressing block. A first groove part, a second groove part and a first through hole communicated with the two groove parts in a penetrating manner are formed in the two opposite surfaces of the mold panel in an inwards concave manner respectively; the splitter plate is fixedly arranged in the first groove part and is provided with a second through hole; the air cylinder is at least partially arranged in the second groove part; the hot nozzle assembly comprises a valve needle and a hot nozzle, one end of the valve needle is coaxially connected with the piston rod, and the other end of the valve needle penetrates through the hot nozzle; the pressing block is arranged close to the second end of the air cylinder, fixed to the second surface of the mold panel and tightly attached to the second end of the air cylinder. The hot runner system can solve the problems that in the prior art, a hot runner system is large in machining difficulty and not easy to install.

Description

Technical Field

[0001] The present application relates to the field of thermoplastic processing technology, and in particular to a hot runner system. Background Art

[0002] While the structure of a hot runner system can vary greatly depending on the type and properties of plastic, the shape and structure of the plastic product, and other factors, the basic structure remains consistent. A hot runner system primarily consists of a manifold, main nozzle, hot nozzle, valve needle, and valve needle actuator. Hot runner processing involves heating and temperature-controlling the plastic being injected, then passing the molten plastic through the main nozzle, manifold, hot nozzle, and finally into the mold cavity. Valve needle actuators typically include hydraulic cylinders and pneumatic cylinders. Cylinders are crucial components of needle-valve hot runner systems, driving the valve needle and thus controlling the opening and closing of the gate. In existing technology, cylinders are typically mounted on the mold panel. Specifically, a retaining ring is installed at the bottom of the cylinder, and the retaining ring is then secured to the mold panel via a slot cut into the panel. However, this mounting method increases the difficulty of processing the mold panel and also increases installation complexity. Summary of the Invention

[0003] In response to the above technical problems, the purpose of this application is to provide a hot runner system that is easy to process and install.

[0004] In order to achieve one of the above-mentioned objectives of the invention, an embodiment of the present application provides a hot runner system, comprising:

[0005] The mold panel has a first surface and a second surface opposite to each other, the first surface is concavely provided with a first groove portion, the second surface is concavely provided with a second groove portion, and the mold panel further has a first through hole, the first through hole penetrates and connects the first groove portion and the second groove portion;

[0006] A diverter plate fixedly disposed in the first groove portion, the diverter plate having a third surface and a fourth surface opposite to each other and a second through hole penetrating the third surface and the fourth surface;

[0007] a cylinder, at least partially disposed in the second groove portion, a piston rod disposed inside the cylinder, and having a first end and a second end opposite to each other;

[0008] A hot nozzle assembly, comprising a valve needle and a hot nozzle, wherein one end of the valve needle is coaxially connected to the piston rod of the cylinder, the piston rod drives the valve needle to move, and the other end of the valve needle is inserted into the hot nozzle; and

[0009] A pressing block is arranged adjacent to the second end of the cylinder and is fixed to the second surface of the mold panel. The pressing block is in close contact with the second end of the cylinder.

[0010] As an optional technical solution, the hot nozzle includes a hot nozzle flow channel and a discharge port connected to the hot nozzle flow channel, the other end of the valve needle extends into the hot nozzle flow channel, and the piston rod drives the valve needle to move away from or toward the discharge port.

[0011] As an optional technical solution, the hot nozzle includes a first part, a middle part and a second part connected in sequence, the first part extends in a direction away from the cylinder, the middle part is arranged on the third surface of the diverter plate, and the second part passes through the second through hole and the first through hole in sequence and is sleeved on the first end of the cylinder, wherein the diameter of the first part and the diameter of the second part are both smaller than the diameter of the middle part.

[0012] As an optional technical solution, the valve needle is fixed to the piston rod through a valve needle connector.

[0013] As an optional technical solution, the valve needle connector is a valve needle buckle, one end of the valve needle buckle is connected to the piston rod, and the other end of the valve needle buckle is connected to one end of the valve needle.

[0014] As an optional technical solution, the cylinder includes a cylinder body, in which a first piston and a partition are arranged. The first piston is arranged adjacent to the second end of the cylinder, and one end of the piston rod adjacent to the second end of the cylinder is fixedly connected to the first piston. The partition divides the cylinder body into a first chamber and a second chamber. The first piston is located in the first chamber, and a second piston fixedly connected to the piston rod is also arranged in the second chamber.

[0015] As an optional technical solution, a heat insulation plate is further included, which is arranged on the second surface of the mold panel, and the heat insulation plate is provided with a third through hole for the second end of the cylinder and the pressure block to pass through.

[0016] As an optional technical solution, a sealing ring is further provided between the bottom of the first groove portion and the diverter plate, and a fourth through hole for the hot nozzle to pass through is provided on the sealing ring.

[0017] As an optional technical solution, the pressing block is a U-shaped structure, and the cylinder is accommodated in an accommodating space formed by the pressing block and the second groove portion.

[0018] As an optional technical solution, the second surface of the mold panel and one of the pressure blocks have a hook, and the other one has a buckle, and the pressure block is fixed to the mold panel by engaging the hook and the buckle; or, the second surface of the mold panel has a first fixing hole, and the pressure block has a second fixing hole, and the pressure block is fixed to the mold panel by screws and the first fixing hole and the second fixing hole.

[0019] Compared with the prior art, the present application uses a pressing block to directly fix the cylinder between the pressing block and the mold panel, which not only reduces the processing difficulty of the mold panel, but also makes it very easy to install and disassemble, saving time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A three-dimensional schematic diagram of a hot runner system according to an embodiment of the present application;

[0021] Figure 2 A three-dimensional schematic diagram of a hot runner system according to an embodiment of the present application from another angle;

[0022] Figure 3 This is a front view of a hot runner system according to an embodiment of the present application;

[0023] Figure 4 For the Figure 3 Schematic diagram of the cross section along line AA;

[0024] Figure 5 This is an exploded schematic diagram of a hot runner system according to an embodiment of the present application; DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0026] As used herein, terms such as "center," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" that indicate spatial relative positions are used for ease of explanation to describe the relationship of one element or feature relative to another element or feature as shown in the accompanying drawings. Spatially relative terms may be intended to encompass different orientations of the device in use or operation other than the orientation shown in the drawings.

[0027] For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0029] Furthermore, it should be understood that although the terms first, second, etc. may be used herein to describe various elements or structures, these described objects should not be limited by these terms. These terms are merely used to distinguish these described objects from each other. For example, a first groove portion may be referred to as a second groove portion, and similarly, a second groove portion may be referred to as a first groove portion, without departing from the scope of protection of this application.

[0030] See Figure 1-Figure 5 , Figure 1 A three-dimensional schematic diagram of a hot runner system according to an embodiment of the present application; Figure 2 A three-dimensional schematic diagram of a hot runner system according to an embodiment of the present application from another angle; Figure 3 This is a front view of a hot runner system according to an embodiment of the present application; Figure 4 For the Figure 3 Schematic diagram of the cross section along line AA; Figure 5 This is a schematic diagram of an exploded view of a hot runner system according to an embodiment of the present application. The present application provides a hot runner system comprising a mold panel 1, a manifold 2, a hot nozzle assembly 3, a cylinder 4, and a pressure block 5. The mold panel 1 has a first surface 11 and a second surface 12 facing each other. The first surface 11 is concavely provided with a first groove portion 13, and the second surface 12 is concavely provided with a second groove portion 14. The mold panel 1 also has a first through hole 15, which extends through and connects the first groove portion 13 and the second groove portion 14.

[0031] The manifold plate 2 is fixedly disposed within the first recess 13. The manifold plate 2 has opposing third and fourth surfaces 21 and 22, and a second through hole 23 extending through the third and fourth surfaces 21 and 22. In this embodiment, the manifold plate 2 is provided with a plurality of third fixing holes 24, and the bottom surface of the first recess 13 is correspondingly provided with a plurality of fourth fixing holes 16. Fasteners 25 are passed through the third fixing holes 24 and locked into the fourth fixing holes 16 to secure the manifold plate 2 to the mold panel 1.

[0032] Moreover, the cylinder 4 is at least partially disposed in the second groove portion 14 , and a piston rod 44 is disposed inside the cylinder. The cylinder 4 has a first end 41 and a second end 42 opposite to each other, and the first end 41 of the cylinder extends into the second through hole 23 .

[0033] In addition, the hot nozzle assembly 3 includes a valve needle 31 and a hot nozzle 32. One end of the valve needle 31 is coaxially connected to the piston rod 44 of the cylinder 4. The piston rod 44 drives the valve needle 31 to move. The other end of the valve needle 31 is inserted into the hot nozzle 32. Of course, the hot nozzle assembly 3 also includes a heating coil wrapped around the periphery of the hot nozzle 32. The periphery of the hot nozzle 32 is formed with a plurality of grooves 37 for the heating coil to be installed. The heating coil is fixed in the grooves 37.

[0034] The pressure block 5 is arranged adjacent to the second end 42 of the cylinder 1 and is fixed to the second surface 12 of the mold panel 1, and the pressure block 5 is in close contact with the second end 42 of the cylinder 4. That is, in the present application, the cylinder 4 is fixed between the mold panel 1 and the pressure block 5 by using the pressure block 5. In this way, no other fixing elements need to be installed on the cylinder 4, and no structural changes need to be made to the mold panel 1, which simplifies the structure of the mold panel 1 and makes the mold panel 1 easier to process. Moreover, in one embodiment, a hook is provided on one of the second surface 12 of the mold panel 1 and the pressure block 5, and a buckle is provided on the other, and the pressure block 5 is fixed to the mold panel 1 by engaging the hook and the buckle. However, the present application is not limited to this. For example, in the present embodiment, the second surface 12 of the mold panel 1 has a first fixing hole 17, and the pressure block 5 has a second fixing hole 51. The pressure block 5 is fixed to the mold panel 1 by screws connected to the first fixing hole 17 and the second fixing hole 51. That is, in the present application, the pressing block 5 is fixed to the mold panel 1 by, for example, a locking method or a snap-fit ​​method, and is easy to install and remove.

[0035] In addition, in this embodiment, the pressing block 5 is, for example, a U-shaped structure, and the cylinder is accommodated in the accommodation space formed by the pressing block 5 and the second groove portion 14. Moreover, preferably, the second fixing holes 51 are provided on both side walls of the U-shaped structure.

[0036] Moreover, in this embodiment, the hot nozzle 32 also includes a hot nozzle flow channel 321 and a discharge port 322 connected to the hot nozzle flow channel 321. The other end of the valve needle 31 extends into the hot nozzle flow channel 321, and the piston rod 44 drives the valve needle 31 to move away from or toward the discharge port 322, so that the valve needle 31 opens or closes the discharge port 322.

[0037] In this embodiment, the hot nozzle 32 includes a first portion 33, a middle portion 34, and a second portion 35, which are sequentially connected. The first portion 33 extends away from the cylinder 4. The middle portion 34 is disposed on the third surface 21 of the manifold 2. The second portion 34 sequentially passes through the second through hole 23 and the first through hole 15 and is sleeved on the first end 41 of the cylinder 4. The diameters of the first portion 33 and the second portion 35 are both smaller than the diameter of the middle portion 34. The provision of the middle portion 34 can limit the hot nozzle 32 to the position above the manifold 2.

[0038] In addition, in this embodiment, the valve needle 31 is fixed to the piston rod 44 via a valve needle connector 36. Specifically, the valve needle connector 36 is, for example, a valve needle buckle, one end of which is connected to the piston rod 44, and the other end of which is connected to one end of the valve needle 31.

[0039] Moreover, the cylinder 4 includes a cylinder body 43, in which a first piston 45 and a partition 46 are arranged. The first piston 45 is arranged adjacent to the second end 42 of the cylinder 4, and one end of the piston rod 44 adjacent to the second end 42 of the cylinder 4 is fixedly connected to the first piston 45. The partition 46 divides the cylinder body 43 into a first chamber 47 and a second chamber 48. The first piston 45 is located in the first chamber 47, and a second piston 49 fixedly connected to the piston rod 44 is also arranged in the second chamber 48.

[0040] It should be noted that the partition 46 divides the cylinder body 43 into two complete working chambers. The compressed gas enters the chamber through the vent, driving the first piston (or piston rod 44) ​​and the second piston 49 to move up and down, and then drives the valve needle 31 to move up and down. The double-piston structure is set up to increase the output force of the cylinder and meet actual production needs.

[0041] In addition, in the present application, the hot runner system also includes a heat insulation plate 7, which is arranged on the second surface 12 of the mold panel 1, and the heat insulation plate 7 is provided with a third through hole 71 for the second end 42 of the cylinder 4 and the pressure block 5 to pass through.

[0042] Furthermore, a sealing ring 8 is disposed between the bottom of the first groove 13 and the manifold 2. The sealing ring 8 is provided with a fourth through-hole for the hot nozzle 32 to pass through. Hot runner systems utilize gas to propel the piston, so providing a sealing ring between the contact surfaces ensures the system's sealing performance.

[0043] In actual application, after the hot runner system applies heating and temperature control to the injection plastic, the main nozzle allows the molten plastic raw material to enter through the diversion pipe in the diversion plate 2 and flow out from the end of the valve needle 31. At this time, the valve needle 31 fixedly connected to the piston rod moves up and down in the hot nozzle 32 under the drive of the piston rod 44, driving the molten plastic raw material in the hot nozzle flow channel 321 to be squeezed out from the discharge port 322 of the hot nozzle 32 into the mold cavity, thereby forming a product.

[0044] In summary, the present application adopts a pressing block to directly fix the cylinder between the pressing block and the mold panel, which not only reduces the processing difficulty of the mold panel, but also makes it very easy to install and disassemble, saving time and effort.

[0045] It should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation method can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0046] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of this application. They are not intended to limit the scope of protection of this application. Any equivalent implementation methods or changes that do not deviate from the technical spirit of this application should be included in the scope of protection of this application.

Claims

1. A hot runner system, characterized in that: The hot runner system includes: The mold panel has a first surface and a second surface opposite to each other, the first surface is concavely provided with a first groove portion, the second surface is concavely provided with a second groove portion, and the mold panel further has a first through hole, the first through hole penetrates and connects the first groove portion and the second groove portion; A diverter plate fixedly disposed in the first groove portion, the diverter plate having a third surface and a fourth surface opposite to each other and a second through hole penetrating the third surface and the fourth surface; a cylinder, at least partially disposed in the second groove portion, a piston rod disposed inside the cylinder, and having a first end and a second end opposite to each other; A hot nozzle assembly, comprising a valve needle and a hot nozzle, wherein one end of the valve needle is coaxially connected to the piston rod of the cylinder, the piston rod drives the valve needle to move, and the other end of the valve needle is inserted into the hot nozzle; and A pressing block is arranged adjacent to the second end of the cylinder and is fixed to the second surface of the mold panel. The pressing block is in close contact with the second end of the cylinder.

2. The hot runner system according to claim 1, wherein: The hot nozzle includes a hot nozzle flow channel and a discharge port connected to the hot nozzle flow channel. The other end of the valve needle extends into the hot nozzle flow channel, and the piston rod drives the valve needle to move away from or toward the discharge port.

3. The hot runner system according to claim 2, wherein: The hot nozzle includes a first part, a middle part and a second part connected in sequence, the first part extends in a direction away from the cylinder, the middle part is arranged on the third surface of the diverter plate, and the second part passes through the second through hole and the first through hole in sequence and is sleeved on the first end of the cylinder, wherein the diameter of the first part and the diameter of the second part are both smaller than the diameter of the middle part.

4. The hot runner system according to claim 1, wherein: The valve needle is fixed to the piston rod through a valve needle connector.

5. The hot runner system according to claim 4, wherein: The valve needle connector is a valve needle buckle, one end of the valve needle buckle is connected to the piston rod, and the other end of the valve needle buckle is connected to one end of the valve needle.

6. The hot runner system according to claim 1, wherein: The cylinder includes a cylinder body, a first piston and a partition are arranged in the cylinder body, the first piston is arranged near the second end of the cylinder, and the end of the piston rod near the second end of the cylinder is fixedly connected to the first piston, the partition divides the cylinder body into a first chamber and a second chamber, the first piston is located in the first chamber, and a second piston fixedly connected to the piston rod is also arranged in the second chamber.

7. The hot runner system according to claim 1, wherein: It also includes a heat insulation plate, which is arranged on the second surface of the mold panel, and is provided with a third through hole for the second end of the cylinder and the pressing block to pass through.

8. The hot runner system according to claim 1, wherein: A sealing ring is further provided between the bottom of the first groove portion and the diverter plate, and a fourth through hole for the hot nozzle to pass through is provided on the sealing ring.

9. The hot runner system according to claim 1, wherein: The pressing block is a U-shaped structure, and the cylinder is accommodated in an accommodating space formed by the pressing block and the second groove portion.

10. The hot runner system according to claim 1, wherein: The second surface of the mold panel and one of the pressure blocks have a hook, and the other one has a buckle, and the pressure block is fixed to the mold panel by engaging the hook and the buckle; or, the second surface of the mold panel has a first fixing hole, and the pressure block has a second fixing hole, and the pressure block is fixed to the mold panel by screws and the first fixing hole and the second fixing hole.

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