CN109249586B - Nozzle for preventing plastic casting - Google Patents
Nozzle for preventing plastic casting Download PDFInfo
- Publication number
- CN109249586B CN109249586B CN201811155532.7A CN201811155532A CN109249586B CN 109249586 B CN109249586 B CN 109249586B CN 201811155532 A CN201811155532 A CN 201811155532A CN 109249586 B CN109249586 B CN 109249586B
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- nozzle
- needle
- valve
- valve sleeve
- preventing
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- 229920003023 plastic Polymers 0.000 title claims abstract description 53
- 239000004033 plastic Substances 0.000 title claims abstract description 53
- 238000005266 casting Methods 0.000 title claims abstract description 36
- 230000000149 penetrating effect Effects 0.000 claims abstract 2
- 238000002347 injection Methods 0.000 claims description 30
- 239000007924 injection Substances 0.000 claims description 30
- 230000002093 peripheral effect Effects 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 9
- 239000003292 glue Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000007766 curtain coating Methods 0.000 abstract 2
- 238000001746 injection moulding Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005491 wire drawing Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000000135 prohibitive effect Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/20—Injection nozzles
- B29C45/23—Feed stopping equipment
- B29C45/231—Needle valve systems therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/20—Injection nozzles
- B29C45/23—Feed stopping equipment
- B29C45/234—Valves opened by the pressure of the moulding material
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses a nozzle for preventing plastic casting, which comprises a flange connector, a middle body and a sub nozzle, wherein a first assembly hole is formed in one end of the middle body along the axial direction of the middle body, a spring, a T-shaped spring stop head and a valve needle are sequentially arranged in the first assembly hole, the vertical section of the T-shaped spring stop head is arranged in the spring in a penetrating way, and the transverse section of the T-shaped spring stop head is abutted against the valve needle; the valve needle is formed by integrally forming the rear end of the needle body, the middle end of the needle body and the front end of the needle body, and the head end of the front end of the needle body is conical so as to be attached to the sub-nozzle; the side end face of the valve needle is provided with a valve sleeve, and the middle end of the needle body is slidably sleeved in a second assembly hole on the valve sleeve. This a penetrate mouth for preventing plastic curtain coating prevents that curtain coating is effectual, stable in structure, modern design, long service life, and the assembly is simple, low in production cost, has effectively solved and has penetrated inside often flash of mouth, and the valve needle is blocked with the valve pocket and often cannot seal the problem of plastics.
Description
Technical Field
The invention relates to the technical field of injection molding machines, in particular to a nozzle for preventing plastic casting.
Background
At present, the plastics industry is very competitive, the types of plastics are continuously increased, the types of additives are more and more, and the requirements are higher and higher, so that the injection molding machine for producing and processing plastics is more and more required, the core part in the injection molding machine is an injection device, and the most difficult problem in producing high-temperature engineering plastics is nozzle casting, wire drawing and cold nozzle, which are one of the most important factors of instability in production.
At present, most of the anti-casting nozzle in the market has very complicated design, for example, chinese patent CN1061182603a discloses an injection molding machine glue injection device, which comprises a material pipe, a screw rod is arranged in the material pipe, a nozzle is arranged at the outlet of the material pipe, the nozzle comprises a nozzle seat connected with the material pipe, a nozzle head connected with the nozzle seat through a connecting rod and a nozzle connecting piece arranged between the nozzle seat and the nozzle head, the nozzle head is connected with the nozzle connecting piece through a tension spring arranged along the axis direction of the nozzle head, the injection molding machine glue injection device with the structure is used for injecting glue every time, and after glue injection is completed, the nozzle core is blocked, thereby preventing the phenomenon of wire drawing and casting caused by continuous outflow of solvent, and further improving the product quality. As disclosed in chinese patent CN105397979, a nozzle for an injection molding machine is provided with a middle valve body in a flow cavity, so that a buffer spring is disposed inside, and an electric heating sleeve is disposed outside the front nozzle body, thereby improving the injection effect and preventing cold material from blocking. For example, chinese patent CN202540612U discloses a leakage-proof nozzle structure, in which a thimble is axially movably disposed between a body and a nozzle head, the head of the thimble is located in a transferring chamber, the head of the thimble is conical, and a spring is disposed in the body instead of the conventional manner that the spring is disposed outside the body, so that the heating device is easily mounted on the outer surface of the nozzle.
The nozzles for injection molding machines disclosed in the above-mentioned patent CN1061182603A, CN105397979 and CN202540612U generally have the drawbacks of very complex design, difficult processing, high cost, difficult maintenance, high failure frequency, etc., which make most enterprises prohibitive for such nozzles.
Disclosure of Invention
The invention aims to solve the technical problem of providing a nozzle for preventing plastic casting aiming at the defects in the prior art.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
The invention provides a nozzle for preventing plastic casting, which comprises a flange connector, a middle body and a sub nozzle which are connected in sequence, wherein a first assembly hole is formed in one end of the middle body along the axis direction of the middle body, a spring, a T-shaped spring blocking head and a valve needle are sequentially arranged in the first assembly hole, the vertical section of the T-shaped spring blocking head is penetrated in the spring, and the transverse section of the T-shaped spring blocking head is propped against the valve needle; the valve needle consists of a needle body rear end, a needle body middle end and a needle body front end which are integrally formed, and the head end of the needle body front end is conical so as to be attached to the sub-nozzle; the side end face of the valve needle is provided with a valve sleeve, the middle end of the needle body is slidably sleeved in a second assembly hole on the valve sleeve, and the front end of the needle body is in sealing connection or separation with the injection runner of the sub-nozzle under the action of the spring or high-pressure molten plastic.
Further, a limiting protrusion is arranged on the outer peripheral surface of the middle end of the needle body in a surrounding mode, the diameter of the middle end of the needle body is slightly smaller than that of the second assembly hole, and the diameter of the limiting protrusion is slightly larger than that of the second assembly hole.
Further, the diameter of the middle end of the needle body or the diameter of the second assembly hole is 2.5mm-50mm.
Further, an inclined plane is arranged between the middle end of the needle body and the front end of the needle body, and an included angle of 30-60 degrees is formed between the inclined plane and the axial direction of the valve needle.
Further preferably, a first cover adhesive is arranged at the head end of the front end of the needle body; the outer peripheral surface of the rear end of the needle body is provided with screw teeth, and the tail end of the screw teeth is abutted against the T-shaped spring stop head.
Further, a first runner inlet, a first runner and a first runner outlet which are mutually communicated are sequentially formed in the flange connector along the axis direction of the flange connector, and the first runner inlet and the first runner outlet are all in an opening shape.
Further preferably, a first thermocouple is provided on the flange connector at a position near the first flow channel outlet.
Further, a plurality of second flow passages are formed in the middle body along the axial direction of the middle body and are arranged around the first assembly holes, and the second flow passages are communicated with the first flow passage outlet in the flange connector.
Further preferably, a conical current guide body is arranged on the end face of the other side of the middle body, and a plurality of second flow passages are uniformly distributed on the outer side of the conical current guide body.
Further preferably, a second thermocouple is provided on the central body at a position close to the second flow path.
Further preferably, a plurality of third flow passages surrounding the second assembly holes are formed in the valve sleeve along the axial direction of the valve sleeve, and the third flow passages are communicated with the second flow passages in a one-to-one correspondence manner.
Further preferably, the valve sleeve further comprises:
at least one inner ring groove embedded in the inner peripheral surface of the second assembly hole;
a plurality of discharging channels which are arranged along the diameter direction of the valve sleeve and are communicated with the inner ring groove;
the outer ring grooves are formed in the outer end face of the valve sleeve and are communicated with the discharging channel; and
The positioning holes are arranged on the side end face of the valve sleeve, correspond to the positioning holes arranged on the side end face of the middle body one by one and are connected through positioning pins.
Further, the peripheral surface of the valve sleeve and the edges of the end surfaces of the two sides are provided with second sealing surfaces.
Further, the diameter of the jet flow passage is 2.0mm-20mm.
Further, the sub-nozzle is of a conical structure, and is further provided with:
The buffer flow passage is communicated with the injection flow passage, is conical and is communicated with a plurality of third flow passages on the valve sleeve; and
And a plurality of discharge ports corresponding to the outer ring grooves on the valve sleeve.
Further, a spring heating ring is sleeved on the outer side of the middle body.
Further, the outer diameter of the middle body is 20mm-150mm.
Further, the total length of the nozzle is 50mm-500mm.
Compared with the prior art, the invention has the following technical effects:
according to the injection nozzle for preventing plastic casting, the front end of the needle body is connected with or separated from the injection runner of the sub injection nozzle in a sealing way under the action of a spring or high-pressure molten plastic, so that the plastic smoothly enters into a mold from the middle hole of the sub injection nozzle or is sealed from flowing outwards, and the purpose of use is achieved; the casting-preventing effect is good, the structure is stable, the design is novel, the service life is long, the assembly is simple, and the production cost is low; the problems that the inside of the injection nozzle is frequently overflowed, the valve needle and the valve sleeve are blocked and the plastic is often not sealed are solved, and the problems that the spring is easy to block after being glued and is excessively extruded to break are also solved.
Drawings
FIG. 1 is a schematic view showing the overall structure of a nozzle for preventing plastic casting according to the present invention;
FIG. 2 is a schematic view showing a partial structure of a nozzle for preventing casting of plastic according to the present invention;
FIG. 3 is a schematic view showing a structure of a flange connector in a nozzle for preventing plastic casting according to the present invention;
FIG. 4 is a schematic view of a valve pin in a nozzle for preventing casting of plastic according to the present invention;
FIG. 5 is a schematic view showing the structure of a nozzle center for preventing plastic casting according to the present invention;
FIG. 6 is a schematic cross-sectional view of the structure of FIG. 1 for preventing casting of plastic material in accordance with section A-A;
FIG. 7 is a schematic cross-sectional view of the structure for preventing B-B cross section on plastic casting shown in FIG. 1 according to the present invention;
FIG. 8 is a schematic side view of the mid-nozzle for preventing casting of plastic according to the present invention;
FIG. 9 is a schematic cross-sectional view of a section C-C of the nozzle center body for preventing plastic casting shown in FIG. 8 according to the present invention;
FIG. 10 is a schematic cross-sectional view of a cross-section D-D of the nozzle center body for preventing plastic casting shown in FIG. 8 according to the present invention;
Wherein, each reference sign is:
10-a flange connector, 11-a first runner inlet, 12-a first runner, 13-a first runner outlet and 14-a first thermocouple; 20-a middle body, 21-a second flow channel, 22-a conical current guiding body, 23-a first assembly hole and 24-a second thermocouple; 30-sub-nozzle, 31-injection runner, 32-buffer runner, 33-discharge port; 40-springs; 50-T spring catch; 60-valve sleeve, 61-second assembly hole, 62-third runner, 63-inner ring groove, 64-outer ring groove, 65-discharge channel, 66-positioning hole, 67-second sealing surface; 70-of a valve needle, 71-of a rear end of a needle body, 72-of a middle end of the needle body, 73-of a front end of the needle body, 74-of a limit projection, 75-of an inclined surface, 76-of a first sealing surface and 77-of a screw thread; 80-spring heating ring.
Detailed Description
The present invention will be described in detail and in detail by way of the following examples, which are not intended to limit the scope of the invention, for better understanding of the invention.
As shown in fig. 1-2, the present embodiment provides a nozzle for preventing plastic casting, including a flange connector 10, a middle body 20 and a sub nozzle 30 connected in sequence, wherein a first assembly hole 23 is formed at one end of the middle body 20 along the axial direction thereof, a spring 40, a T-shaped spring stop 50 and a valve needle 70 are sequentially installed in the first assembly hole 23, a vertical section of the T-shaped spring stop 50 is penetrated in the spring 40, and a transverse section of the T-shaped spring stop 50 is abutted against the valve needle 70; the valve needle 70 is formed by integrally forming a needle body rear end 71, a needle body middle end 72 and a needle body front end 73, and the head end of the needle body front end 73 is conical so as to be attached to the sub-nozzle 30; the valve needle 70 is provided with a valve sleeve 60 on its side end surface, the middle end 72 of the needle body is slidably sleeved in the second assembly hole 61 on the valve sleeve 60, and the front end 73 of the needle body is connected with or separated from the injection runner 31 of the sub-nozzle 30 under the action of the spring 40 or high-pressure molten plastic.
When the melted plastic is extruded into the first flow channel 12 of the flange connector 10 by the screw, the melted plastic flows into the reserved space between the sub-nozzle 30 and the valve needle 70 and the valve sleeve 60, namely the buffer flow channel 32 through the plurality of second flow channels 21 in the middle body 20. When the instantaneous pressure rises, the plastic can push the valve needle 70 back to compress the spring 40, the head of the front end 73 of the needle body is separated from the injection flow passage 31 of the sub-nozzle 30, and the plastic smoothly enters the die from the injection flow passage 31 of the sub-nozzle 30; after the screw injection is stopped, the pressure of the molten plastic in the buffer flow channel 32 is reduced, the plastic loses the pressure on the valve needle 70, the valve needle 70 moves forwards under the action of the spring 40, the head of the front end 73 of the needle body is in sealing connection with the injection flow channel 31 of the sub-nozzle 30, the valve needle 70 can be forced to return to the original position by the high-temperature-resistant spring 40 and is connected with the injection flow channel 31 in the sub-nozzle 30, and the valve needle is attached to the inclined surface of the buffer flow channel 32 to seal the plastic from flowing outwards, so that the use purpose is achieved.
In one embodiment, as shown in fig. 4, the outer circumferential surface of the needle body middle end 72 is provided with a limit protrusion 74, the diameter of the needle body middle end 72 is slightly smaller than the diameter of the second assembly hole 61, and the diameter of the limit protrusion 74 is slightly larger than the diameter of the second assembly hole 61. The diameter of the needle body middle end 72 or the diameter of the second assembly hole 61 is 3mm-30mm; preferably, the diameter of the middle end 72 or the diameter of the second fitting hole 61 is 3mm-20mm; preferably 5mm to 14mm; the valve needle sleeve is easy to damage, and the maintenance cost is high.
In one embodiment, as shown in fig. 4, an inclined surface 75 is disposed between the needle middle end 72 and the needle front end 73, and the inclined surface 75 forms an angle of 30-60 °, preferably 35-50 °, and more preferably 35-45 ° with the axial direction of the valve needle 70. And a first cover adhesive 76 is arranged at the head end of the front end 73 of the needle body; screw teeth 77 are provided on the outer peripheral surface of the rear end 71 of the needle body, and the tail end thereof abuts against the T-shaped spring stopper 50.
In one embodiment, as shown in fig. 3 and 7, a first channel inlet 11, a first channel 12 and a first channel outlet 13 are sequentially formed in the flange connector 10 along the axial direction thereof, and the first channel inlet 11 and the first channel outlet 13 are both open. And a first thermocouple 14 is provided on the flange connector 10 near the first flow channel outlet 13.
In one embodiment, as shown in fig. 1-2 and 5-6, the middle body 20 is provided with a plurality of second flow passages 21 along the axial direction thereof, and the second flow passages 21 are arranged around the first assembly holes 23, and are communicated with the first flow passage outlets 13 on the flange connector 10. The diameter of the second flow channel 21 is 1-10mm, the number is 20-20, and the second flow channels are uniformly distributed on the middle body 20.
The end face of the other side of the middle body 20 is provided with a conical current guiding body 22, and a plurality of second flow channels 21 are uniformly distributed on the outer side of the conical current guiding body 22. And a second thermocouple 24 is provided on the middle body 20 at a position close to the second flow passage 21.
In one embodiment, as shown in fig. 1-2 and 4, the valve sleeve 60 is provided with a plurality of third flow passages 62 surrounding the second assembly holes 61 along the axial direction, and the third flow passages 62 are in one-to-one correspondence with the second flow passages 21.
In one embodiment, as shown in fig. 8-10, the valve sleeve 60 further comprises: at least one inner ring groove 63 embedded in the inner peripheral surface of the second fitting hole 61; a plurality of discharge channels 65 which are arranged along the diameter direction of the valve sleeve 60 and are communicated with the inner ring grooves 63; a plurality of outer ring grooves 64 arranged on the outer end surface of the valve sleeve 60, wherein the outer ring grooves 64 are communicated with the discharge channel 65; and a plurality of positioning holes 66 arranged on the side end surface of the valve sleeve 60, wherein the positioning holes 66 are in one-to-one correspondence with the positioning holes arranged on the side end surface of the middle body 20 and are connected through positioning pins. The needle valve 70 is prevented from leaking, if the needle valve is leaked, the leaked needle valve is discharged from a discharge port (33) on the valve sleeve (60) through the inner ring groove 63, the discharge channel (65) and the outer ring groove (64), and the normal operation of the equipment is ensured. And the peripheral surface and the edges of the two side end surfaces of the valve sleeve 60 are provided with second sealing glue surfaces 67, the diameter of the discharge channel 65 is 1-10mm, the number of the discharge channels is 1-20, and the discharge channels are uniformly distributed in the inner diameter direction of the valve sleeve (60). The structural design of the valve sleeve 60 solves the problems that the spring 40 is easy to be blocked after glue is fed, and is excessively extruded to break, and solves the problems that the inside of the injection nozzle often overflows, the valve needle 70 and the valve sleeve 60 are blocked and the plastic is often not sealed.
In one embodiment, as shown in fig. 1-2 and 6, the sub-nozzle 30 has a conical structure, and further comprises: a buffer flow channel 32 in communication with the injection flow channel 31, the buffer flow channel 32 being tapered and in communication with a plurality of third flow channels 62 on the valve housing 60; and a plurality of discharge ports 33 corresponding to the outer annular grooves 64 on the valve sleeve 60.
In one embodiment, the diameter of the injection flow path 31 is 2.0mm-20mm. The outer side of the middle body 20 is sleeved with a spring heating ring 80. The outer diameter of the central body 20 is 20mm-150mm, preferably 30mm-100mm. The total length of the nozzle is 50mm-500mm, preferably 100mm-200mm.
As a preferred embodiment, there is also provided a method of assembling a nozzle for preventing casting of plastic, comprising the steps of:
(1) The flange connector 10 and the middle body 20 are connected by screw threads and screwed in a clockwise direction;
(2) Then the flange connector 10 and the middle body 20 after connection are vertically placed, the alloy spring 40 is arranged in the middle body 20, and the T-shaped spring blocking head 50 is arranged in one end of the spring 40;
(3) The valve needle 70 is arranged in the valve sleeve 60, is integrally arranged in the first assembly hole 23 of the middle body 20, and the positioning hole 66 on one side of the valve sleeve 60 is aligned with the two positioning holes on the side end surface of the middle body 20 and is connected through a positioning pin;
(4) Screwing the sub-nozzle 30 in the vertical direction and the middle body 20 in the clockwise direction, and fixing the sub-nozzle 30 and the valve sleeve 60 through the bolts, the discharge hole 33 and the second fixing holes;
(5) Finally, the whole device is arranged in a feeding pipe flange, the spanner positions of the flange connector 10 and the sub-nozzle 30 are sequentially tightened clockwise by applying force, and then the first thermocouple 14, the second thermocouple 24 and the spring heating ring 80 are arranged.
The disassembly method of the nozzle for preventing plastic casting is the reverse of the assembly method.
The front injection nozzle with the needle valve and valve sleeve structure for preventing plastic casting solves the problems that the prior injection nozzle middle body is difficult to process and the valve needle and the valve sleeve are extremely difficult to process and assemble; solves the problems that the inside of the injection nozzle often overflows, the valve needle and the valve sleeve are blocked and the plastic is often not sealed; the problem that the spring is easy to be blocked after being carbonized after being glued and is broken due to excessive extrusion is solved; solves the problems of easy damage to the valve needle sleeve, high maintenance cost and the like,
The above description of the specific embodiments of the present invention has been given by way of example only, and the present invention is not limited to the above described specific embodiments. Any equivalent modifications and substitutions for the present invention will occur to those skilled in the art, and are also within the scope of the present invention. Accordingly, equivalent changes and modifications are intended to be included within the scope of the present invention without departing from the spirit and scope thereof.
Claims (12)
1. The injection nozzle for preventing plastic casting comprises a flange connector (10), a middle body (20) and a sub injection nozzle (30) which are sequentially connected, and is characterized in that a first assembly hole (23) is formed in one end of the middle body (20) along the axial direction of the middle body, a spring (40), a T-shaped spring stop head (50) and a valve needle (70) are sequentially arranged in the first assembly hole (23), a vertical section of the T-shaped spring stop head (50) is arranged in the spring (40) in a penetrating manner, and a transverse section of the T-shaped spring stop head (50) is abutted against the valve needle (70); the valve needle (70) consists of a needle body rear end (71), a needle body middle end (72) and a needle body front end (73) which are integrally formed, and the head end of the needle body front end (73) is conical so as to be attached to the sub-nozzle (30); the side end face of the valve needle (70) is provided with a valve sleeve (60), the middle end (72) of the needle body is slidably sleeved in a second assembly hole (61) on the valve sleeve (60), and the front end (73) of the needle body is in sealing connection or separation with the injection runner (31) of the sub-nozzle (30) under the action of the spring (40) or high-pressure molten plastic;
A plurality of third flow passages (62) surrounding the second assembly holes (61) are formed in the valve sleeve (60) along the axial direction of the valve sleeve, and the third flow passages (62) are communicated with the second flow passages (21) in a one-to-one correspondence manner;
The outer peripheral surface of the needle body middle end (72) is annularly provided with a limit protrusion (74), the diameter of the needle body middle end (72) is slightly smaller than the diameter of the second assembly hole (61), and the diameter of the limit protrusion (74) is slightly larger than the diameter of the second assembly hole (61);
a plurality of second flow passages (21) which are arranged around the first assembly holes (23) are formed in the middle body (20) along the axial direction of the middle body, and the second flow passages (21) are communicated with the first flow passage outlets (13) on the flange connector (10);
the valve housing (60) further comprises:
At least one inner ring groove (63) embedded in the inner peripheral surface of the second assembly hole (61);
A plurality of discharge channels (65) which are arranged along the diameter direction of the valve sleeve (60) and are communicated with the inner ring groove (63);
the outer ring grooves (64) are formed in the outer end face of the valve sleeve (60), and the outer ring grooves (64) are communicated with the discharge channel (65); and
The positioning holes (66) are formed in the side end face of the valve sleeve (60), and the positioning holes (66) correspond to the positioning holes formed in the side end face of the middle body (20) one by one and are connected through positioning pins.
2. Nozzle for preventing casting of plastics according to claim 1, characterized in that the diameter of the needle middle end (72) or the diameter of the second fitting hole (61) is 2.5mm-50mm.
3. Nozzle for preventing plastic casting according to claim 1, characterized in that an inclined surface (75) is provided between the needle middle end (72) and the needle front end (73), the inclined surface (75) forming an angle of 30-60 ° with the axial direction of the valve needle (70).
4. Nozzle for preventing plastic casting according to claim 1, characterized in that the head end of the needle body front end (73) is provided with a first cover glue (76); screw teeth (77) are arranged on the outer peripheral surface of the rear end (71) of the needle body, and the tail end of the screw teeth is abutted against the T-shaped spring stop head (50).
5. Nozzle for preventing plastic casting according to claim 1, characterized in that a first runner inlet (11), a first runner (12) and a first runner outlet (13) which are mutually communicated are sequentially arranged in the flange connector (10) along the axis direction, and the first runner inlet (11) and the first runner outlet (13) are both opened.
6. Nozzle for preventing casting of plastics according to claim 5, characterized in that a first thermocouple (14) is provided on the flange connection body (10) near the first flow channel outlet (13).
7. Nozzle for preventing plastic casting according to claim 1, characterized in that the other side end face of the middle body (20) is provided with a conical guide body (22), and a plurality of second runners (21) are uniformly distributed on the outer side of the conical guide body (22).
8. Nozzle for preventing casting of plastics according to claim 1, characterized in that a second thermocouple (24) is provided on the central body (20) close to the second flow channel (21).
9. Nozzle for preventing casting of plastics according to claim 1, characterized in that the outer circumferential surface and both side end edges of the valve sleeve (60) are provided with second sealing surfaces (67).
10. Nozzle for preventing casting of plastics according to claim 1, characterized in that the diameter of the injection runner (31) is 2.0mm-20mm.
11. Nozzle for preventing casting of plastics according to claim 1, characterized in that said sub-nozzle (30) is of conical structure, on which is also provided:
A buffer flow passage (32) communicated with the injection flow passage (31), wherein the buffer flow passage (32) is conical and is communicated with a plurality of third flow passages (62) on the valve sleeve (60); and
And a plurality of discharge ports (33) corresponding to the outer ring grooves (64) on the valve sleeve (60).
12. Nozzle for preventing plastic casting according to claim 1, characterized in that the outer side of the central body (20) is sleeved with a spring heating ring (80).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811155532.7A CN109249586B (en) | 2018-09-30 | 2018-09-30 | Nozzle for preventing plastic casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811155532.7A CN109249586B (en) | 2018-09-30 | 2018-09-30 | Nozzle for preventing plastic casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109249586A CN109249586A (en) | 2019-01-22 |
| CN109249586B true CN109249586B (en) | 2024-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811155532.7A Active CN109249586B (en) | 2018-09-30 | 2018-09-30 | Nozzle for preventing plastic casting |
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| CN (1) | CN109249586B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110978413B (en) * | 2019-12-28 | 2021-08-31 | 况仁鹏 | Valve needle nozzle core structure for hot runner and hot runner system comprising same |
| CN112157864B (en) * | 2020-09-16 | 2022-06-24 | 扬州市职业大学(扬州市广播电视大学) | Rubber injection molding machine and molding method |
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