Liquid silicone injection nozzle

Abstract

The application discloses a liquid silicone injection nozzle, which comprises a shell, an inner cylinder, a plug rod, an annular end cover and a connecting head, the plug rod and the inner cylinder are nested in the shell, the bottom end of the inner cylinder is provided with a tapered transition area, the bottom end of the plug rod is matched with the outlet of the inner cylinder, the annular end cover is sealingly arranged at the bottom end of the shell, and the inner side wall of the annular end cover is sealingly connected with the outer side wall of the inner cylinder, the connecting head is sealingly arranged at the top end of the shell, the connecting head is provided with an inflow channel matched with the inner cylinder, an annular blocking piece is arranged in the inflow channel, the plug rod is connected with a plug matched with the inner circumference of the annular blocking piece through an elastic linkage structure, when external liquid silicone extrudes the plug from the inflow channel and overcomes the elastic potential energy of the elastic linkage structure, the plug and the plug rod synchronously open the inner circumference of the annular blocking piece and the outlet of the inner cylinder, and when the pressure of the external liquid silicone is smaller than the elastic potential energy, the plug and the plug rod synchronously close the aforementioned channel, so that the liquid silicone is prevented from flowing out and blocking the outlet of the inner cylinder.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid silicone injection molding equipment, in particular to a liquid silicone injection nozzle. BACKGROUND

[0002] Liquid silicone has good fluidity, fast vulcanization speed and good performance, and is widely used in various industries. Since liquid silicone can also vulcanize at room temperature, the temperature of the liquid silicone injection nozzle position needs to be controlled within a certain temperature range to prevent the nozzle from being blocked by vulcanization at the nozzle.

[0003] At present, there is no liquid silicone injection nozzle with cooling function. Therefore, the injection molding work of liquid silicone cannot be well met. SUMMARY

[0004] An advantage of the present application is to provide a liquid silicone injection nozzle, wherein when external liquid silicone applies pressure on the inflow channel side to overcome the elastic potential energy of the elastic linkage structure, the inner circumference of the annular blocking piece and the outlet of the inner cylinder are opened synchronously, and when the external liquid silicone applies less pressure on the inflow channel side, the inner circumference of the annular blocking piece and the outlet of the inner cylinder are closed synchronously, thereby synchronously cutting off the inlet and outlet of the nozzle, so that even after stopping work, liquid silicone will not flow out of the outlet of the inner cylinder to block the nozzle, and raw materials can also be saved.

[0005] In addition, a cooling medium area is formed between the inner cylinder and the outer shell, which can ensure that the liquid silicone in the inner cylinder does not vulcanize.

[0006] The liquid silicone injection nozzle is designed to be detachable, which is convenient for assembly and maintenance and has low cost.

[0007] To achieve at least one advantage of the present application, the present application provides a liquid silicone injection nozzle, comprising a coaxially connected outer shell, an inner cylinder, a plug rod, an annular end cover and a connector, wherein the outer shell has opposite first and second ends along the length direction;

[0008] The plug rod and the inner cylinder are sequentially nested in the shell cavity of the outer shell, and a cooling medium area is formed between the inner cylinder and the outer shell, and a liquid silicone flow channel is formed between the plug rod and the inner cylinder, the inner cylinder is provided with a tapered transition area with gradually reduced inner diameter at one end close to the second end, and one end of the plug rod close to the second end is matched with the outlet of the inner cylinder;

[0009] The annular end cover is arranged at the second end in a manner of sealing the cooling medium area, and the inner side wall of the annular end cover is sealingly connected with the outer side wall of the inner cylinder;

[0010] The connecting head is arranged at the first end in a manner of sealing the cooling medium area, and is provided with an inflow channel matched with the outer wall of the inner cylinder, and an annular blocking piece is arranged in the inflow channel, the outer circumference of the annular blocking piece is fixedly connected with the inflow channel, and the plug rod is connected with a plug matched with the inner circumference of the annular blocking piece through an elastic linkage structure, wherein the elastic linkage structure is configured to: when the external liquid silicone is extruded to the plug from the side of the inflow channel and overcomes the elastic potential energy of the elastic linkage structure, the plug and the plug rod can move towards each other in a direction of synchronously opening the inner circumference of the annular blocking piece and the outlet of the inner cylinder, and when the pressure of the external liquid silicone is less than the elastic potential energy of the elastic linkage structure, the plug and the plug rod can move away from each other in a direction of synchronously closing the inner circumference of the annular blocking piece and the outlet of the inner cylinder.

[0011] According to an embodiment of the present application, the inner side wall of the annular end cover is threadedly connected with the outer side wall of the inner cylinder, and the inner side surface of the annular end cover is provided with a first annular groove in the circumferential direction, and a sealing ring is embedded in the first annular groove, and the shell abuts on the sealing ring of the first annular groove in a sealed contact manner with the annular end cover.

[0012] According to an embodiment of the present application, the taper of the conical transition region is 1:20-1:40, and the taper of the part of the plug rod opposite to the conical transition region is smaller than the taper of the conical transition region.

[0013] According to an embodiment of the present application, the plug rod is uniformly distributed with flow guide platforms in the circumferential direction, the flow guide platforms extend along the length direction of the plug rod, and liquid silicone flow guide channels are formed between adjacent flow guide platforms.

[0014] According to an embodiment of the present application, the connecting head is provided with a second annular groove matched with the shell opposite to the side surface of the shell, a sealing ring is embedded in the second annular groove, and the shell abuts on the sealing ring of the second annular groove in a sealed contact manner with the connecting head.

[0015] According to an embodiment of the present application, the inflow channel is provided with an internal thread matched with the outer wall of the inner cylinder.

[0016] According to an embodiment of the present application, the elastic linkage structure comprises a spring and at least two groups of connecting rods, rotating rods and transmission rods, the connecting rods are vertically and symmetrically connected to the inner side surface of the annular blocking piece outside the plug, the rotating rods are correspondingly hingedly connected to the bottoms of the connecting rods at positions close to the middle parts, one end of the rotating rod is hingedly connected to the plug, the other end of the rotating rod is correspondingly hingedly connected to the top end of the transmission rod, the other end of the transmission rod is hingedly connected to the plug rod outside, and the spring is vertically connected to the opposite surfaces of the plug and the plug rod.

[0017] According to an embodiment of the present application, the opposite surfaces of the plug and the plug rod are provided with grooves for mounting the spring.

[0018] According to an embodiment of the present application, the plug is an inverted T-shaped circular truncated cone structure, comprising a limiting portion and a matching portion, wherein the matching portion is matched with the inner circumference of the annular blocking piece, the limiting portion is located on the inner side of the annular blocking piece, and the diameter of the limiting portion is greater than the inner diameter of the inner circumference of the annular blocking piece, and the rotating rod is hinged on the limiting portion.

[0019] According to an embodiment of the present application, the matching portion is provided with a tapered table at the end away from the limiting portion, and the diameter of the tapered table gradually decreases from the side close to the matching portion to the side away from the matching portion.

[0020] These and other objects, features, and advantages of the present application will become apparent with reference to the following detailed description of the application. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 A three-dimensional structure schematic diagram of a liquid silicone injection nozzle according to a preferred embodiment of the present application is shown.

[0022] Fig. 2 A partial structure schematic diagram of a liquid silicone injection nozzle according to a preferred embodiment of the present application is shown.

[0023] Fig. 3 A cross-sectional structure schematic diagram of a liquid silicone injection nozzle according to a preferred embodiment of the present application is shown.

[0024] Fig. 4 An enlarged structure schematic diagram of the elastic linkage structure part in the present application is shown. DETAILED DESCRIPTION

[0025] The following description is presented to enable any person skilled in the art to practice the present application as claimed. The preferred embodiments disclosed herein are only examples of the present application and alternative embodiments will become apparent to those skilled in the art and practice the present application without departing from the spirit and scope of the present application. The basic principles defined in the following description are applicable to other embodiments, variations, improvements, equivalents and other technical solutions without departing from the spirit and scope of the present application.

[0026] Those skilled in the art should understand that in the disclosure of the specification, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the above terms cannot be understood as a limitation of the present application.

[0027] It can be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of one element can be one, and in another embodiment, the number of the element can be multiple, and the term "one" cannot be understood as a limitation on the number.

[0028] Reference Figs. 1 to 4 A liquid silicone injection nozzle according to a preferred embodiment of the present application will be described in detail below, wherein the liquid silicone injection nozzle comprises a housing 10, an inner cylinder 20, a plug rod 30, an annular end cover 40 and a connecting head 50 coaxially connected, wherein the housing 10 has opposite first and second ends along the length direction;

[0029] The plug rod 30 and the inner cylinder 20 are sequentially nested in the shell cavity of the housing 10, that is, the inner cylinder 20 is nested in the shell cavity of the housing 10, and the plug rod 30 is located in the cylinder cavity of the inner cylinder 20, and the three are coaxially distributed, at the same time, a cooling medium area 101 is formed between the inner cylinder 20 and the housing 10 for cooling the liquid silicone in the inner cylinder 20, and a liquid silicone flow channel 102 is formed between the plug rod 30 and the inner cylinder 20 for the flow of liquid silicone to be sprayed out by means of the injection nozzle. In addition, the inner cylinder 20 is provided with a tapered transition area 21 with a gradually reduced inner diameter at one end close to the second end, and the plug rod 30 is matched with the outlet 201 of the inner cylinder 20 at one end close to the second end for sealing the outlet of the inner cylinder 20 to avoid the flow of liquid silicone or for opening the outlet 201 of the inner cylinder 20 to implement the injection of silicone; the annular end cover 40 is arranged at the second end in a manner of sealing the cooling medium area 101, and the inner side wall of the annular end cover 40 is sealingly connected with the outer side wall of the inner cylinder 20, thereby forming a bottom end sealing for the cooling medium area 101, and also not affecting the injection of silicone of the outlet 201 of the inner cylinder 20;

[0030] The connecting head 50 is arranged at the first end in a manner of sealing the cooling medium area 101, and the connecting head 50 is provided with an inflow channel 501 matched with the outer wall of the inner cylinder 20, and an annular blocking piece 51 is arranged in the inflow channel 501, wherein the outer circumference of the annular blocking piece 51 is fixedly connected with the inflow channel 501, and the plug rod 30 is connected with a plug 70 matched with the inner circumference of the annular blocking piece 51 through an elastic linkage structure 60, wherein the elastic linkage structure 60 is configured to: when the external liquid silicone is pressed against the plug 70 from the side of the inflow channel 501 and overcomes the elastic potential energy of the elastic linkage structure 60, the plug 70 and the plug rod 30 can move towards each other in a direction of synchronously opening the inner circumference of the annular blocking piece 51 and the outlet 201 of the inner cylinder 20, and when the pressure of the external liquid silicone is less than the elastic potential energy of the elastic linkage structure 60, the plug 70 and the plug rod 30 can move away from each other in a direction of synchronously closing the inner circumference of the annular blocking piece 51 and the outlet 201 of the inner cylinder 20, so that when the injection nozzle stops working, the inner circumference of the annular blocking piece 51 (i.e. the inlet of the inner cylinder) and the outlet 201 of the inner cylinder 20 are synchronously closed, thereby avoiding the problem of liquid silicone flowing out of the outlet 201 of the inner cylinder 20 and blocking the nozzle, and saving raw materials, and the cooling medium area 101 formed between the inner cylinder 20 and the shell 10 can ensure that the liquid silicone in the inner cylinder 20 does not vulcanize.

[0031] In one embodiment, the inner side wall of the annular end cover 40 is threadedly connected with the outer side wall of the inner cylinder 20, and the inner side surface of the annular end cover 40 is provided with a first annular groove in the circumferential direction, wherein a sealing ring is embedded in the first annular groove, and the shell 10 abuts on the sealing ring of the first annular groove in a sealed contact manner with the annular end cover 40, so that the annular end cover 40 can seal the cooling medium area 101, and the threaded connection of the annular end cover 40 and the inner cylinder 20 is easy for assembly and later maintenance of the injection nozzle.

[0032] In one embodiment, the taper of the tapered transition area 21 is 1:20-1:40, and the taper of the part of the plug rod 30 opposite to the tapered transition area 21 is smaller than the taper of the tapered transition area 21, thereby ensuring that the liquid silicone in the inner cylinder 20 is quickly injected out of the injection nozzle, and because the taper of the plug rod 30 at this position is smaller than the taper of the inner cylinder 20 at this position, the gap between the plug rod 30 and the inner cylinder 20 becomes smaller and the amount of liquid silicone becomes less as the opening 201 of the inner cylinder 20 is approached, so that the plug rod 30 can more easily seal the outlet 201 of the inner cylinder 20, and the sealing effect is good.

[0033] In one embodiment, the plug rod 30 is uniformly distributed with flow guide platforms 31 in the circumferential direction, wherein the flow guide platforms 31 extend along the length direction of the plug rod 30, and the liquid silicone flow channels 103 are formed between adjacent flow guide platforms 31, thereby facilitating the rapid and directional flow of liquid silicone in the inner cylinder 20, and improving the injection and spraying speed and effect of the injection nozzle.

[0034] In one embodiment, the connecting head 50 is provided with a second annular groove opposite to the side surface of the shell 10, wherein the second annular groove is embedded with a sealing ring, and the shell 10 abuts on the sealing ring of the second annular groove in a sealed contact with the connecting head 50, so that the cooling medium area 101 at the other end can be sealed through the connecting head 50.

[0035] In one embodiment, the inflow channel 501 is provided with an internal thread matched with the external thread of the outer wall of the inner cylinder 20, facilitating the rapid assembly and later maintenance between the inner cylinder 20 and the connecting head 50.

[0036] In one embodiment, the elastic linkage structure 60 includes a spring 61 and two or three groups of connecting rods 62, rotating rods 63 and transmission rods 64, wherein the connecting rods 62 are connected to the inner side of the annular blocking piece 51 in a vertical symmetry on the outside of the plug head 70, the rotating rods 63 are hingedly connected to the bottom of the connecting rods 62 at a position close to the middle, one end of the rotating rods 63 is hingedly connected to the plug head 70, and the other end of the rotating rods 63 is hingedly connected to the top end of the transmission rods 64, the other end of the transmission rods 64 is hingedly connected to the plug rod 30 on the outside, and the spring 61 is vertically connected to the opposite surfaces of the plug head 70 and the plug rod 30.

[0037] When the pressure of the external liquid silicone applied to the plug 70 overcomes the elastic potential energy of the spring 61, the plug 70 moves towards the direction of the plug rod 30, and also drives the plug rod 30 to move towards the direction of the plug 70 through the articulated relationship between the rotating rod 63, the plug 70 and the transmission rod 64, the plug rod 30 and the plug 70 move towards each other to compress the spring 61 until the pressure of the external liquid silicone and the rebound force of the spring 61 are balanced, the external liquid silicone flows into the inner cavity of the inner cylinder 20 from the inner circumference of the annular blocking piece 51, and then flows out through the liquid silicone guide channel 103 and the outlet 201 of the inner cylinder 20, realizing the injection and spraying of the glue of the injection nozzle. When it is necessary to stop injecting and spraying the glue, the applied pressure of the external liquid silicone decreases, and under the rebound force of the spring 61 and the aforementioned articulated relationship, the plug 70 and the plug rod 30 move away from each other, wherein the plug 70 blocks the inner circumference of the annular blocking piece 51, and the plug rod 30 blocks the outlet 201 of the inner cylinder 20, thereby avoiding the liquid silicone in the inner cylinder 20 from continuing to flow out and blocking the outlet 201 of the inner cylinder 20.

[0038] Further preferably, the opposite surfaces of the plug 70 and the plug rod 30 are both provided with a groove 701 for mounting the spring 61, so as to facilitate the installation of the spring 61 and the directional release of the elastic potential energy of the spring 61.

[0039] In one embodiment, the plug 70 is an inverted T-shaped circular truncated cone structure, including a limiting portion 71 and a matching portion 72, wherein the matching portion 72 matches the inner circumference of the annular blocking piece 51, and the limiting portion 71 is located on the inner side of the annular blocking piece 51, and the diameter of the limiting portion 71 is greater than the inner diameter of the inner circumference of the annular blocking piece 51, and the rotating rod 63 is articulated on the limiting portion 71, thereby being able to seal the inner circumference of the annular blocking piece 51 through the limiting portion 71 and the matching portion 72.

[0040] The annular blocking piece 51 can be an annular blocking plate, or an annular blocking step or boss.

[0041] In one embodiment, the end of the matching portion 72 away from the limiting portion 71 is provided with a tapered table 73, wherein the diameter of the tapered table 73 gradually decreases from the side close to the matching portion 72 to the side away from the matching portion 72, thereby being able to avoid the plug 70 from damaging the annular blocking piece 51 during repeated movement, thereby prolonging the service life of the injection nozzle.

[0042] It should be noted that the terms "first", "second" in the present application are only used for description purpose, and do not indicate any sequence, and cannot be understood as indicating or implying relative importance, and the terms can be interpreted as names.

[0043] It should be understood by those skilled in the art that the above description and the embodiments of the present application shown in the drawings are only examples and do not limit the present application. The advantages of the present application have been fully and effectively achieved. The functions and structural principles of the present application have been shown and described in the embodiments, and the embodiments of the present application can be modified or changed in any way without departing from the principles.

Claims

1. Liquid silicone injection nozzle, characterized in that The shell, the inner cylinder, the plug rod, the annular end cover and the connector are coaxially connected, wherein the shell has opposite first and second ends along the length direction; The plug rod and the inner cylinder are sequentially nested in the shell cavity of the shell, and a cooling medium area is formed between the inner cylinder and the shell, and a liquid silicone flow channel is formed between the plug rod and the inner cylinder, the inner cylinder is provided with a tapered transition area with gradually reduced inner diameter at one end close to the second end, and one end of the plug rod close to the second end is matched with the outlet of the inner cylinder; The annular end cover is arranged at the second end in a manner of sealing the cooling medium area, and the inner side wall of the annular end cover is sealingly connected with the outer side wall of the inner cylinder; The connector is arranged at the first end in a manner of sealing the cooling medium area, and the connector is provided with an inflow channel matched with the outer wall of the inner cylinder, and an annular blocking piece is arranged in the inflow channel, the outer circumference of the annular blocking piece is fixedly connected with the inflow channel, the plug rod is connected with a plug matched with the inner circumference of the annular blocking piece through an elastic linkage structure, wherein the elastic linkage structure is configured to: when the external liquid silicone extrudes the plug from the inflow channel side and overcomes the elastic potential energy of the elastic linkage structure, the plug and the plug rod can move towards each other to synchronously open the inner circumference of the annular blocking piece and the outlet of the inner cylinder, and when the pressure of the external liquid silicone is less than the elastic potential energy of the elastic linkage structure, the plug and the plug rod can move away from each other to synchronously close the inner circumference of the annular blocking piece and the outlet of the inner cylinder; The elastic linkage structure includes a spring and at least two groups of connecting rods, rotating rods and transmission rods, wherein the connecting rods are vertically and symmetrically connected to the inner side of the annular blocking piece outside the plug, the rotating rods are correspondingly hinged to the bottoms of the connecting rods at positions close to the middle, one end of the rotating rod is hinged to the plug, the other end is correspondingly hinged to the top end of the transmission rod, the other end of the transmission rod is hinged to the plug rod outside, and the spring is vertically connected to the opposite surfaces of the plug and the plug rod.

2. The liquid silicone injection nozzle of claim 1, wherein, The inner side wall of the annular end cover is threadedly connected with the outer side wall of the inner cylinder, the inner side of the annular end cover is provided with a first annular groove in the circumferential direction, and a sealing ring is embedded in the first annular groove.

3. The liquid silicone injection nozzle of claim 2, wherein the nozzle body is formed from a material selected from the group consisting of: stainless steel, aluminum, and combinations thereof. The taper of the tapered transition area is 1:20-1:40, and the taper of the part of the plug rod opposite to the tapered transition area is smaller than the taper of the tapered transition area.

4. The liquid silicone injection nozzle of claim 1, wherein, The plug rod is uniformly provided with flow guide tables in the circumferential direction, the flow guide tables extend along the length direction of the plug rod, and liquid silicone flow guide channels are formed between adjacent flow guide tables.

5. The liquid silicone injection nozzle of claim 1, wherein, The connector is provided with a second annular groove matched with the shell opposite to the side surface of the shell, a sealing ring is embedded in the second annular groove, and the shell abuts against the sealing ring of the second annular groove in a sealing contact manner with the connector.

6. The liquid silicone injection nozzle of claim 1, wherein, The inflow channel is provided with an internal thread matched with an external thread of the outer wall of the inner cylinder.

7. The liquid silicone injection nozzle of claim 6, wherein the nozzle body is formed from a material selected from the group consisting of: stainless steel, aluminum, and combinations thereof. The opposite surfaces of the plug and the plug rod are both provided with grooves for mounting the spring.

8. The liquid silicone injection nozzle of claim 6, wherein the nozzle body is formed from a material selected from the group consisting of: stainless steel, aluminum, and combinations thereof. The plug is an inverted T-shaped circular truncated cone structure, comprising a limiting part and a matching part, wherein the matching part is matched with the inner circumference of the annular blocking piece, the limiting part is located on the inner side of the annular blocking piece, and the diameter of the limiting part is greater than the inner diameter of the inner circumference of the annular blocking piece, and the rotating rod is hinged on the limiting part.

9. The liquid silicone injection nozzle of claim 8, wherein the nozzle body is formed from a material selected from the group consisting of: stainless steel, aluminum, and combinations thereof. The end of the matching part away from the limiting part is provided with a tapered table, and the diameter of the tapered table gradually decreases from the side close to the matching part to the side away from the matching part.

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