CN215320321U

CN215320321U - Injection system

Info

Publication number: CN215320321U
Application number: CN202121187909.4U
Authority: CN
Inventors: 丁暑生; 陈云; 陈俊; 陆康华
Original assignee: Siemens Circuit Protection Systems Ltd
Current assignee: Siemens Circuit Protection Systems Ltd
Priority date: 2021-05-31
Filing date: 2021-05-31
Publication date: 2021-12-28
Anticipated expiration: 2031-05-31

Abstract

The present invention provides an injection system. The injection system comprises: the forming die comprises a cavity, and the cavity is used for forming an object to be formed; a feeding part which comprises a feeding component and at least one discharging sprue component, wherein the discharging sprue component comprises a discharging sprue and a valve needle, a discharging channel is arranged in the discharging sprue, a discharging port of the discharging channel is positioned in a cavity of a forming die so that a glue feeding point is positioned on an object to be formed, the valve needle is movably arranged in the discharging sprue relative to the discharging sprue so as to open or close the discharging port, and the feeding component is connected with the discharging sprue component so as to convey materials into the discharging channel; and a heat insulation structure disposed between the forming mold and the feeding portion to increase heat resistance between the forming mold and the feeding portion. The injection system is less expensive to produce.

Description

Injection system

Technical Field

The embodiment of the application relates to the field of molding equipment, in particular to an injection mold and an injection system.

Background

In the production process of the miniature circuit breaker, the reduction of the production cost of the shell has great significance to the reduction of the cost of the whole production link. When the existing shell is produced, the shell is usually made of BMC (bulk molding compound) materials and is formed by injection molding. Since the BMC material is a thermosetting material, the main molding methods thereof include molding, injection molding, and the like. The molding method is to directly add the BMC material into a cavity of a mold and then to perform die-casting molding, and the molding method has the disadvantages that the BMC material must be added manually by a mass method or a volume method, so that the material is more expensive, the labor cost is high, and the molding period is long.

For injection molding and injection, the BMC material is extruded into a cavity of a mold through a machine screw, and then the required shell is molded in the cavity. As shown in fig. 1, in both molding methods, a glue inlet (i.e., an outlet of the BMC material) of the injection molding machine and a glue inlet point of the object 20 to be molded (e.g., a housing) need to be connected through a flow channel 80, which results in material waste and increased cost.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problems, embodiments of the present application provide an injection mold and an injection system to at least partially solve the above problems.

According to a first aspect of embodiments of the present application, there is provided an injection system comprising: the forming die comprises a cavity, and the cavity is used for forming an object to be formed; a feeding part which comprises a feeding component and at least one discharging sprue component, wherein the discharging sprue component comprises a discharging sprue and a valve needle, a discharging channel is arranged in the discharging sprue, a discharging port of the discharging channel is positioned in a cavity of a forming die so that a glue feeding point is positioned on an object to be formed, the valve needle is movably arranged in the discharging sprue relative to the discharging sprue so as to open or close the discharging port, and the feeding component is connected with the discharging sprue component so as to convey materials into the discharging channel; and a heat insulation structure disposed between the forming mold and the feeding portion to increase heat resistance between the forming mold and the feeding portion.

Optionally, the discharge sprue comprises: the sprue main body is provided with a discharging channel; and the valve nozzle is detachably connected to the sprue main body and is provided with a discharge port, the discharge port is communicated with the discharge channel, and the valve needle can slide relative to the valve nozzle to open or close the discharge port.

Optionally, the sprue main body comprises a through hole, the through hole is arranged at one end of the sprue main body, which is far away from the valve nozzle, the valve needle penetrates out of the sprue main body from the through hole, and the discharge sprue further comprises a supporting structure, the supporting structure is sleeved outside the valve needle and is supported on the hole wall of the through hole to support the valve needle.

Optionally, the support structure includes a support sealing ring and a support frame, the support sealing ring is located between the support frame and the hole wall, the support frame is supported between the support sealing ring and the valve needle, a material passing hole for passing the material is arranged on the support frame, and the material passing hole is communicated with the discharging channel.

Optionally, the feeding assembly comprises a main sprue component and a flow distribution plate group, the main sprue component is provided with a material conveying channel, the flow distribution plate group is connected between the main sprue component and the material discharging sprue component, and the flow distribution plate group is provided with a branch channel communicated with the material conveying channel and the material discharging channel.

Optionally, the set of splitter plates comprises: the upper splitter plate is provided with a first splitter groove; the lower splitter plate is fixedly connected with the upper splitter plate, a second splitter groove is arranged on the lower splitter plate, and the first splitter groove and the second splitter groove are matched to form a splitter channel; and the shunting sealing ring is arranged between the upper shunting plate and the lower shunting plate so as to seal a gap between the upper shunting plate and the lower shunting plate.

Optionally, the injection system further comprises a nozzle plate and a backing plate, the backing plate is fixedly connected to the nozzle plate to enhance the structural strength of the nozzle plate, and the splitter plate assembly and the discharge sprue assembly are fixedly mounted on the nozzle plate.

Optionally, the sprue assembly comprises a sprue sleeve and a sprue, the sprue sleeve being mounted on the sprue.

Optionally, the injection system further comprises a drive cylinder connected to the needle and driving the needle to reciprocate in the discharge channel.

Optionally, the height of the glue inlet surface formed on the object to be molded by the discharge port of the discharge nozzle is lower than the use surface of the object to be molded.

The discharge sprue assembly of the injection system provided by the embodiment of the application is used for conveying materials into a forming die so as to form an object to be formed (such as a shell of a miniature circuit breaker) in a cavity of the forming die. Because the discharge hole of the discharge sprue component extends into the cavity, the glue inlet point is positioned on the object to be formed, so that a flow channel can be omitted, the generation of a stub bar in the forming process is avoided, and the material and the cost are saved. The valve needle is movably arranged in the discharge channel, and the discharge port can be opened or closed by moving the valve needle to different positions so as to reliably control the discharge amount. The feeding assembly is used for feeding materials into the discharging channel of the discharging sprue so as to improve the automation degree of feeding.

In the embodiment, the injection system with the new structure enables the position of the glue inlet point relative to the object to be molded to be adjusted to the object to be molded from one side of the object to be molded, so that a flow channel is omitted, materials are saved, and the production cost is reduced.

Drawings

The drawings are only for purposes of illustrating and explaining the present application and are not to be construed as limiting the scope of the present application. Wherein the content of the first and second substances,

FIG. 1 is a schematic view showing the connection between a glue inlet and an object to be molded through a runner in the prior art;

fig. 2 shows a schematic perspective view of an object to be molded according to an embodiment of the application;

FIG. 3 shows a front view structural schematic of an object to be molded according to an embodiment of the present application;

FIG. 4 shows a schematic perspective view at the feeding section of an injection system according to an embodiment of the present application;

FIG. 5 shows a cross-sectional structural schematic of an injection system according to an embodiment of the present application;

FIG. 6 shows a partial enlarged view at I in FIG. 5;

fig. 7 shows a schematic perspective view of a discharge nozzle according to an embodiment of the present application.

Description of reference numerals:

10. forming a mold; 20. an object to be molded; 21. feeding a glue surface; 22. a use surface; 31. a flow distribution plate group; 311. a shunt channel; 312. an upper spreader plate; 313. a lower spreader plate; 321. a main sprue bush; 322. a main sprue; 40. a discharge sprue bushing assembly; 41. a valve needle; 421. a discharge port; 422. a sprue main body; 423. a valve mouth; 50. a water gap plate; 60. a base plate; 70. a driving oil cylinder; 91. a heat insulation plate; 92. and (7) fixing the plate.

Detailed Description

In order to more clearly understand the technical features, objects and effects of the embodiments of the present application, specific embodiments of the present application will be described with reference to the accompanying drawings.

Referring to fig. 2 to 7, an embodiment of the present application provides an injection system including a molding die 10, a supply portion, and a heat insulation structure, the molding die 10 including a cavity for molding an object 20 to be molded; the feeding part comprises a feeding component and at least one discharging sprue component 40, the discharging sprue component 40 comprises a discharging sprue and a valve needle 41, a discharging channel is arranged in the discharging sprue, a discharging port 421 of the discharging channel is positioned in a cavity of the forming die 10, so that a glue feeding point is positioned on an object 20 to be formed, the valve needle 41 is movably arranged in the discharging sprue relative to the discharging sprue to open or close the discharging port 421, and the feeding component is connected with the discharging sprue component 40 to convey materials into the discharging channel; the heat insulating structure is provided between the molding die 10 and the supply portion to increase the heat resistance between the molding die 10 and the supply portion.

The discharge nozzle assembly 40 of the injection system is used to deliver material into the molding die 10 to mold an object 20 to be molded (e.g., a housing of a miniature circuit breaker) in a cavity of the molding die 10. Because the discharge hole 421 of the discharge sprue component 40 extends into the cavity, the glue inlet point is located on the object 20 to be molded, so that a flow channel can be omitted, thereby avoiding the generation of a stub bar in the molding process, and saving the material and the cost. The valve needle 41 is movably arranged in the discharge channel, and the discharge hole can be opened or closed by moving the valve needle 41 to different positions, so that the discharge amount can be reliably controlled. The feeding assembly is used for feeding materials into the discharging channel of the discharging sprue so as to improve the automation degree of feeding. The heat insulating structure may increase thermal resistance in a heat transfer path between the molding die 10 and the feeding portion, thereby preventing solidification of the material at the feeding portion.

In the embodiment, the injection system with the new structure enables the position of the glue inlet point relative to the object 20 to be molded to be adjusted to the object 20 to be molded from one side of the object to be molded, so that the runner 80 is omitted, the material is saved, and the production cost is reduced.

The structure and operation of the injection system will be described in detail below with reference to the accompanying drawings:

to securely carry the feed section and the like, the injection system includes a nozzle plate 50 and a backing plate 60, the backing plate 60 being fixedly attached to the nozzle plate 50 to enhance the structural strength of the nozzle plate 50.

As shown in fig. 5, the water gap plate 50 covers the feeding portion and provides a mounting position for the feeding portion to carry the feeding portion. Because the subassembly etc. that the feed portion contained are more, make the inside hollowed space of water gap plate 50 great for can holding the feed portion, lead to its structural strength to reduce to a certain extent, in order to promote its structural strength, guarantee injection system's reliability, stability and life, be connected with backing plate 60 on water gap plate 50. The backing plate 60 may be made of a suitable material and shape, and the connecting position with the nozzle plate 50 may be selected as needed, which is not limited in this embodiment.

The nozzle plate 50 may be connected to a fixed plate 92, and a connecting plate (also referred to as an a plate) may be connected to the molding die 10 below the nozzle plate 50. It should be noted that only a part of the molding die is shown in fig. 5 for clarity of illustration.

In this embodiment, since the material to be conveyed is a BMC material and has thermosetting properties, it is necessary to control the temperature within a proper range during the material conveying process to prevent the material from being solidified and clogging during the material conveying process, which may affect the production efficiency. In an example, the heat insulation structure may be a heat insulation plate 91, the heat insulation plate 91 may be specifically disposed between the nozzle plate 50 and the connecting plate, and the heat insulation plate 91 may be made of a material with high thermal resistance, and by disposing the heat insulation plate between the nozzle plate 50 and the connecting plate, heat transfer from the forming mold 10 to the nozzle plate 50 is effectively isolated, so that the risk of solidification of the material in the conveying process is reduced.

In this embodiment, the supply assembly of the supply section comprises a main sprue assembly and a manifold assembly 31. The main sprue component is provided with a material conveying channel, the flow distribution plate group 31 is connected between the main sprue component and the material discharging sprue component, and the flow distribution plate group 31 is provided with a flow distribution channel 311 communicated with the material conveying channel and the material discharging channel. Thus, the discharge sprue assembly 40 and the main sprue assembly are connected through the flow distribution plate assembly 31 to convey material to the discharge sprue assembly 40 through the main sprue assembly.

This configuration is particularly useful in injection systems that include multiple discharge nozzle assemblies 40. For example, as shown in fig. 4, the injection system of the present embodiment includes 8 discharge nozzle assemblies 40, and each discharge nozzle assembly 40 is used for forming one object 20 to be formed. By arranging the splitter plate group 31, one main sprue assembly can supply 8 discharging sprue assemblies 40, so that the structure is simplified.

Optionally, the main sprue assembly comprises a main sprue bush 321 and a main sprue 322, the main sprue bush 321 being mounted on the main sprue 322. As shown in FIG. 5, primary nozzle sleeve 321 is mounted on fixed plate 92 and is connected to the upper end of primary nozzle 322. Main sprue bush 321 is used to connect the supply pipe and main sprue 322. The main sprue 322 is connected to the splitter plate assembly 31, and the main sprue 322 is provided with the material conveying channel for materials to pass through.

The branch channels 311 on the flow dividing plate set 31 are used for communicating the material conveying channels of the main nozzles 322 and the discharging channels of the discharging nozzles, thereby realizing the flow dividing effect.

As shown in fig. 4 and 5, the splitter plate assembly 31 and the discharge nozzle assembly are fixedly mounted on the nozzle plate 50.

In order to facilitate processing and reduce cost, the flow distribution plate group 31 comprises an upper flow distribution plate 312, a lower flow distribution plate 313 and a flow distribution sealing ring, and a first flow distribution groove is formed in the upper flow distribution plate 312; the lower diversion plate 313 is fixedly connected with the upper diversion plate 312, a second diversion groove is arranged on the lower diversion plate 313, and the first diversion groove and the second diversion groove are matched to form a diversion channel 311; a diverter seal is provided between the upper diverter plate 312 and the lower diverter plate 313 to seal the gap between the upper diverter plate 312 and the lower diverter plate 313.

A first connecting hole is arranged on the upper splitter plate 312, and the first connecting hole is connected with the main sprue 322 and the splitter passage 311. The lower diversion plate 313 is provided with 8 second communication holes, and each second communication hole is used for being connected with the discharging sprue so as to enable the discharging channel on the discharging sprue to be communicated with the diversion channel 311.

The upper diversion plate 312 and the lower diversion plate 313 are connected through a fastener, and a diversion sealing ring is arranged between the upper diversion plate 312 and the lower diversion plate 313 to seal the periphery of the diversion channel 311 through the diversion sealing ring so as to prevent materials from overflowing from the diversion channel 311.

As shown in fig. 5, the discharging sprue comprises a sprue main body 422 and a valve 423, and the sprue main body 422 is provided with a discharging channel; valve 423 is detachably connected to sprue main body 422, discharge port 421 is arranged on valve 423, discharge port 421 is communicated with the discharge channel, and valve needle 41 can slide relative to valve 423 to open or close discharge port 421.

Sprue body 422 is connected to lower diverter plate 313. Because discharge port 421 of sprue main body 422 is located in the cavity, the temperature of the portion of discharge port 421 of sprue main body 422 intersecting with the portion far from the cavity is higher, so that the material may be solidified at discharge port 421 of sprue main body 422 to cause blockage. Therefore, when the discharge port 421 is blocked, the valve 423 can be conveniently detached for cleaning and dredging, so that the maintenance efficiency is improved, and the maintenance cost is reduced.

Valve tip 423 may be threadably coupled to spout body 422 or may be removably coupled thereto, although the embodiment is not limited thereto.

Further, the length H of valve tip 423 may be appropriately determined depending on the efficiency of temperature rise of valve needle 41, the solidification temperature of the material, and the inability of the material in valve tip 423 to solidify.

The end of the valve 423 extends into the cavity, and the end opening thereof can be used as the discharging port 421, in this embodiment, the discharging port 421 of the discharging nozzle forms the glue inlet surface 21 on the object 20 to be molded, which is lower than the using surface 22 of the object 20 to be molded.

As shown in fig. 2, the surface of the end of the valve tip 423 contacting the object 20 to be molded is the glue inlet surface 21, and the use surface 22 of the object to be molded may be a normal surface of the molded object 20 to be molded. If the object to be molded is a housing, the use surface may be an outer surface or an inner surface of the housing, or the like. Because the height of the glue inlet surface 21 formed on the object 20 to be molded by the discharge port 421 is lower than the use surface 22 of the object 20 to be molded, a groove is formed at the glue inlet of the object 20 to be molded, so that even if burrs are generated at the glue inlet during demolding, the height of the burrs can be ensured not to be higher than the use surface of the object 20 to be molded to a greater extent, thereby ensuring the use effect of the molded object 20 to be molded.

The height difference between the glue inlet surface 21 and the use surface 22 (i.e. the depth of the formed groove) can be determined as required, for example, 0.1mm to 0.15mm, and this height range ensures that the burr does not protrude from the use surface 22 to the maximum extent without damaging the structural strength of the object 20 to be molded and affecting the use. The height difference may be determined adaptively according to different objects to be molded, and materials used, and the like, and this embodiment does not limit this.

Optionally, because the valve needle 41 has a longer length, in order to avoid deviation or bending caused by impact of the material during operation, the sprue main body 422 includes a through hole, the through hole is disposed at an end of the sprue main body 422 away from the valve nozzle 423, the valve needle 41 penetrates through the sprue main body 422 from the through hole, the discharge sprue further includes a support structure, and the support structure is disposed outside the valve needle 41 and is supported on a hole wall of the through hole to support the valve needle 41. The valve needle 41 is supported by the support structure to improve the strength of the valve needle.

One or more support structures may be disposed along the length of the valve needle 41, and the embodiment is not limited thereto.

Optionally, the supporting structure includes a supporting sealing ring 424a and a supporting frame 424b, the supporting sealing ring 424a is located between the supporting frame 424b and the hole wall, the supporting frame 424b is supported between the supporting sealing ring 424a and the valve needle 41, a material passing hole 424c for passing the material is provided on the supporting frame 424b, and the material passing hole 424c is communicated with the material outlet channel.

The supporting sealing ring 424a may seal the gap to prevent leakage of the material. The support 424b is used to support the valve needle 41 to increase its strength, and since material is required to enter the nozzle body 422 through the through hole, a material passing hole 424c is provided in the support 424b in order to ensure that the material entering is not affected in the case of providing the support 424 b.

In a preferred mode, the supporting frame 424b comprises a ring body and a plurality of supporting arms arranged in the ring body, the supporting arms are arranged on the inner wall of the ring body and extend along the radial direction of the ring body, and the supporting arms are used for being matched with the valve needle 41 to limit and support the valve needle. The gap between two adjacent support arms can be used as the material passing hole 424 c.

Of course, in other embodiments, the supporting frame 424b may have other suitable structures, and the embodiment is not limited thereto.

Optionally, the injection system further comprises a drive cylinder 70, the drive cylinder 70 being connected to the needle 41 and driving the needle 41 to reciprocate in the discharge channel. The driving cylinder 70 is used as a power source of the valve needle 41 to control the valve needle 41 to move, so as to open the discharge port 421 or close the discharge port 421 as required.

The driving oil cylinder 70 is provided with two oil inlets and two oil outlets to push the valve needle 41 to move through the inlet and outlet of the hydraulic oil.

The operation of the injection system is as follows: after the mold is closed, under the driving of the driving cylinder 70, the valve needle 41 is disengaged from the valve nozzle 423, so as to open the discharge port 421, and meanwhile, the flocculent material (such as BMC material) enters the main sprue 322 under the rotation and extrusion of the machine screw, then enters the 8 discharge spouts through the diversion channels 311 respectively, and is injected into the corresponding mold cavity through the discharge port 421 of the discharge spout.

When the injection action is finished, the valve needle 41 moves under the action of the driving oil cylinder 70, and is matched with the valve mouth 423 to close the discharge hole 421 so as to cut off the material. And curing the material in the cavity at high temperature to form the object to be formed. Then, the object 20 to be molded is ejected out after opening the mold, and a molding cycle is completed.

Thus, the injection system can be matched with a cooling system, a temperature sensing system and the like to realize the automatic, efficient and low-cost processing and production of the object to be molded.

In summary, the injection system of the present embodiment has the following beneficial effects:

the discharge sprue component comprises a replaceable valve needle, the valve needle is fixed on the driving oil cylinder and matched with the detachable valve nozzle, so that the discharge sprue component is very convenient to replace, maintain and clean, and is fully suitable for materials which are easy to solidify at high temperature. The valve needle is in sliding fit with the valve nozzle to realize opening or closing of the discharge hole, the gap between the valve needle and the valve nozzle is proper, and the problem that the sealing glue is not tight and burrs are easy to occur due to overlarge gap can be avoided. The materials of the valve needle and the valve nozzle ensure that one has high hardness and the other has low hardness, for example, when in actual use, the valve needle is made of a material with high rigidity and hardness so as to improve the reliability and prolong the service life.

It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.

The above description is only an exemplary embodiment of the present disclosure, and is not intended to limit the scope of the present disclosure. Any person skilled in the art should be able to make equivalent changes, modifications and combinations without departing from the concept and principle of the embodiments of the present application.

Claims

1. An injection system, comprising:

a forming die (10) including a cavity for forming an object (20) to be formed;

a feeding part, which comprises a feeding component and at least one discharging sprue component (40), wherein the discharging sprue component (40) comprises a discharging sprue and a valve needle (41), a discharging channel is arranged in the discharging sprue, a discharging port (421) of the discharging channel is positioned in a cavity of the forming die (10) so that a glue inlet is positioned on the object to be formed (20), the valve needle (41) is movably arranged in the discharging sprue relative to the discharging sprue so as to open or close the discharging port (421), and the feeding component is connected with the discharging sprue component (40) so as to convey materials into the discharging channel;

a heat insulating structure provided between the forming die (10) and the supply portion to increase a heat resistance between the forming die (10) and the supply portion.

2. The injection system of claim 1, wherein the discharge sprue comprises:

the sprue main body (422) is provided with the discharging channel;

a valve nozzle (423), the valve nozzle (423) is detachably connected to the sprue body (422), the valve nozzle (423) is provided with the discharge port (421), the discharge port (421) is communicated with the discharge channel, and the valve needle (41) can slide relative to the valve nozzle (423) to open or close the discharge port (421).

3. The injection system of claim 2, wherein the sprue body (422) includes a through-hole disposed at an end of the sprue body (422) distal from the valve nozzle (423), the valve needle (41) extends through the through-hole and out of the sprue body (422), the discharge sprue further including a support structure disposed over the valve needle (41) and supported on a wall of the through-hole to support the valve needle (41).

4. The injection system according to claim 3, wherein the support structure comprises a support sealing ring (424a) and a support frame (424b), the support sealing ring (424a) is located between the support frame (424b) and the bore wall, the support frame (424b) is supported between the support sealing ring (424a) and the valve needle (41), the support frame (424b) is provided with a material passing hole (424c) for passing the material, and the material passing hole (424c) is communicated with the material outlet channel.

5. An injection system according to claim 1, wherein said supply assembly comprises a main sprue assembly and a manifold assembly (31), said main sprue assembly being provided with a feed passage, said manifold assembly (31) being connected between said main sprue assembly and said discharge sprue assembly, said manifold assembly (31) being provided with a manifold (311) communicating said feed passage with said discharge passage.

6. The injection system of claim 5, wherein the set of splitter plates (31) comprises:

an upper splitter plate (312), the upper splitter plate (312) having a first splitter slot disposed thereon;

the lower flow distribution plate (313) is fixedly connected with the upper flow distribution plate (312), a second flow distribution groove is formed in the lower flow distribution plate (313), and the first flow distribution groove and the second flow distribution groove are matched to form the flow distribution channel (311);

a diverter seal ring disposed between said upper diverter plate (312) and said lower diverter plate (313) to seal a gap between said upper diverter plate (312) and said lower diverter plate (313).

7. The injection system of claim 5, further comprising a nozzle plate (50) and a backing plate (60), wherein the backing plate (60) is fixedly attached to the nozzle plate (50) to increase the structural strength of the nozzle plate (50), and wherein the manifold block (31) and the discharge sprue assembly are fixedly attached to the nozzle plate (50).

8. An injection system according to claim 5, wherein the sprue assembly comprises a sprue bushing (321) and a sprue (322), said sprue bushing (321) being mounted on said sprue (322).

9. The injection system of claim 1, further comprising a drive cylinder (70), wherein the drive cylinder (70) is connected to the needle (41) and drives the needle (41) to reciprocate within the discharge passage.

10. Injection system according to claim 1, characterised in that the outlet (421) of the outlet nozzle forms a glue inlet surface (21) on the object (20) to be moulded at a level lower than the surface (22) of use of the object (20).