CN218948283U - Shut-off nozzle for injection molding - Google Patents
Shut-off nozzle for injection molding Download PDFInfo
- Publication number
- CN218948283U CN218948283U CN202222954905.5U CN202222954905U CN218948283U CN 218948283 U CN218948283 U CN 218948283U CN 202222954905 U CN202222954905 U CN 202222954905U CN 218948283 U CN218948283 U CN 218948283U
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- Prior art keywords
- main body
- nozzle
- needle valve
- spring
- injection molding
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- 238000001746 injection moulding Methods 0.000 title claims abstract description 37
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 239000007921 spray Substances 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 230000003044 adaptive effect Effects 0.000 claims 5
- 239000000463 material Substances 0.000 description 6
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000003670 easy-to-clean Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The shutoff nozzle for injection molding comprises a nozzle main body, a nozzle head, a needle valve, a plane spiral spring, a spring tightening pin and a fixing pin; the nozzle head and the main body are internally provided with a flow passage, the main body is also provided with a guide passage, the needle valve is arranged in the flow passage of the nozzle head and the main body, the needle valve head is provided with a needle-shaped part which is matched with a nozzle feeding hole of the nozzle head, and the tail part of the needle valve stretches into the guide passage of the main body and stretches out of the guide passage; the main body is provided with a cavity for accommodating the planar spiral spring at the rear side of the guide channel, the outer end of the planar spiral spring is aligned with the rear end of the needle valve, the inner end of the planar spiral spring is fixed on a spring tightening pin, the spring tightening pin is arranged on the main body at two sides of the cavity, the tail part of the spring tightening pin is provided with a limiting hole, and a fixing pin is inserted into the limiting hole and then fixed on the main body; when injection molding is stopped, the plane volute spring enables the needle valve to move forwards to seal the nozzle head and cannot spray liquid; during injection molding, the liquid pressure in the flow channel enables the needle valve to move backwards to be away from the nozzle head, and liquid is normally sprayed out.
Description
Technical Field
The present utility model relates to a nozzle of an injection molding machine.
Background
The main function of the shutoff nozzle is to improve the process in injection molding, and mainly has the functions of improving filaments, increasing storage back pressure to improve the homogeneity of the melt, preventing the melt from leaking during vertical injection, and the like.
The existing shutoff nozzle comprises a nozzle body and a nozzle head, a needle valve is arranged in a flow passage space between the nozzle body and the nozzle head, the front end of the needle valve can seal a discharge passage of the nozzle head, the rear part of the needle valve is connected to the nozzle body in a sliding manner, a locking component is fixed on the nozzle body, and a locking piece of the locking component is abutted against the rear end of the needle valve; in the normal state and the storage state, the locking component props against the rear end of the needle valve to enable the needle valve to seal a discharge channel of the nozzle head; in the material injection state, the material in the nozzle body presses the needle valve to retreat so that the front end of the needle valve leaves the discharge channel of the nozzle head.
The existing locking assembly is complex in structure, more in parts and larger in occupied space, so that the whole nozzle is large in size and not compact enough. And because the nozzle needs to go deep into the injection molding template, the requirement on compactness is high.
Disclosure of Invention
The utility model aims to solve the defects and provide a shutoff nozzle for injection molding, which has a simple and compact structure.
The technical scheme adopted for solving the technical problems is as follows:
the shutoff nozzle for injection molding comprises a nozzle main body, a nozzle head, a needle valve, a plane spiral spring, a spring tightening pin and a fixing pin; the nozzle head and the main body are internally provided with a flow passage, the main body is also internally provided with a guide passage, the needle valve is arranged in the flow passage of the nozzle head and the main body, the needle valve head is provided with a needle-shaped part which is matched with a nozzle feeding hole of the nozzle head, and the tail part of the needle valve stretches into the guide passage of the main body and stretches out of the guide passage; the main body is provided with a cavity for accommodating a plane scroll spring at the rear side of the guide channel, the outer end of the plane scroll spring is aligned with the rear end of the needle valve, the inner end of the plane scroll spring is fixed on a spring tightening pin, the spring tightening pin is arranged on the main body at two sides of the cavity, the tail part of the spring tightening pin is provided with a limiting hole, and a fixing pin is inserted into the limiting hole and then fixed on the main body; when injection molding is stopped, the plane volute spring enables the needle valve to move forward to seal the nozzle head so that the needle valve cannot spray liquid in the flow channel; during injection molding, the liquid pressure in the flow channel enables the needle valve to move backwards to be away from the nozzle head, so that the needle valve can normally spray out the liquid in the flow channel.
Preferably, the main body is provided with a through hole for installing a spring tightening pin, the spring tightening pin is inserted into the through hole, and a blind hole is further formed for installing a fixing pin, so that the installation is convenient.
Preferably, the spring tightening pin is provided with a groove which can accommodate the inner end of the spring and a limiting hole communicated with the groove, and the outer end of the spring tightening pin is further provided with a groove which is matched with the tool so that the tool can rotate through the groove to transmit torque.
More specifically, the grooves are hexagonal grooves.
Preferably, the fixing pin is provided with a front section, a middle section and a rear section with different diameters, the front section is larger than the middle section and smaller than the rear section, three steps are formed, the rear section is provided with a through hole, and the fixing pin can be pulled out through the insertion of a tool into the through hole, so that the fixing pin is conveniently pulled out.
Preferably, a bush is further provided, the bush is mounted in the guide passage of the main body, and the rear portion of the needle valve is connected in the guide passage after passing through the bush, so that the needle valve can be sealed with the bush better.
Preferably, the needle valve is further provided with a shaft shoulder, and when the needle valve moves backwards, the shaft shoulder is limited by the bushing, so that the distance of the needle valve moving backwards can be limited when the nozzle is opened, and overload of the plane volute spring is avoided.
Preferably, the injection molding machine further comprises an adapter, an adapter channel is arranged in the adapter, the tail of the main body is connected with the adapter and communicated with the main body channel, a preferable connection mode is in threaded connection and can be fixedly connected with a material pipe of an injection molding machine, the preferable connection mode is in threaded or flange connection, and the adapter is beneficial to standardizing the main body so as to adapt to mass production.
Preferably, a wear block is also provided, and the needle valve is fixedly connected, preferably welded or screwed, with the wear block. In this way, the needle valve is contacted with the outer end of the spring through the wear-resistant block, so that the wear rate can be effectively reduced.
Preferably, the main body is also provided with a through hole communicated with the cavity, so that the cavity of the main body is easy to clean.
Preferably, the main body is wrapped with the heating ring and provided with the temperature measuring part for heating and controlling the temperature of the main body, so that the liquid in the flow channel of the main body flows smoothly.
Compared with the prior art, the utility model has the advantages that: the flat spiral spring is used as the power for driving the nozzle to cut off and is fixed in the cavity of the main body, so that the structure is simple, the parts are few and compact, and the volume of the main body is not excessively increased.
Drawings
Fig. 1 is a front view of a shut-off nozzle for injection molding according to an embodiment of the present utility model.
Fig. 2 is a D-D sectional view of the nozzle of fig. 1 in an opened state.
Fig. 3 is a D-D sectional view of the nozzle of fig. 1 in an opened state.
Fig. 4 is a section A-A of fig. 1.
Fig. 5 is a sectional view of E-E of fig. 1.
Fig. 6 is a cross-sectional view of F-F of fig. 5.
Fig. 7 is a schematic view of the structure of the embodiment of the utility model after the spring is tightened.
Fig. 8 is a perspective view of a spring tightening pin according to an embodiment of the present utility model.
Fig. 9 is a perspective view of a fixing pin according to an embodiment of the present utility model.
Detailed Description
The utility model is further described below with reference to the embodiments of the drawings.
As shown in fig. 1 to 9, a shut-off nozzle for injection molding includes a nozzle body 1, a nozzle head 2, an adapter head 3, a needle valve 4, a bushing 5, a flat spiral spring 6, a spring tightening pin 7, a wear block 8, and a fixing pin 9.
The nozzle head 2 is provided with a through nozzle head channel 22 in the middle, the left end of the nozzle head channel 22 is provided with a nozzle hole 21, and the right side of the channel is connected with the left side of the main body 1, preferably in a threaded connection mode.
The right side of the main body 1 is connected with the adapter 3, and a preferable connection mode is threaded connection.
The main body 1 is provided with a plurality of main body channels 11 which are communicated with each other in front and back, the front part of the main body channels 11 is communicated with a nozzle head channel 22, and the rear part is communicated with an adapter head channel 31 which is described below.
The adapter 3 is internally provided with an adapter channel 31, the right side of the adapter channel can be fixedly connected with a material pipe of an injection molding mechanism, a preferred connection mode is a threaded or flange connection, and the adapter 3 is beneficial in that the main body 1 is standardized so as to adapt to mass production.
The nozzle head 2, the main body 1 and the adapter 3 are internally provided with a flow channel from the right side of the adapter 3 to the nozzle head 2.
The main body 1 is also provided with a guide channel 12, and the bushing 5 is arranged in the guide channel 12 of the main body 1.
The needle valve 4 is arranged in a channel formed by the nozzle head 2 and the main body 1, the head of the needle valve 4 is provided with a needle-shaped part 42 which is matched with the nozzle feed port 23 of the nozzle head 2, the tail of the needle valve 4 extends into the inner hole of the bushing 5 and is in clearance fit with the bushing 5 to extend out of the guide channel 12 of the main body, and the bushing 5 is fixed in the guide channel 12 of the main body 1, so that when the needle valve 4 moves forwards, the needle-shaped part 42 is closely attached to the nozzle feed port 23 of the nozzle head 2, and the nozzle head 2 can be sealed so that liquid in a flow channel cannot be sprayed out; when the needle valve 4 moves backward, the needle portion 42 is separated from the nozzle feed port 23 of the nozzle head 2, so that it can normally eject the liquid in the flow passage.
The needle valve 4 is further provided with a shaft shoulder 41, when the needle valve 4 moves backwards, the shaft shoulder 41 is limited by the bushing 5, and when the nozzle is opened, the distance of the needle valve moving backwards is limited, so that overload of the plane volute spring 6 is avoided.
The main body 1 is provided with a cavity 1a for accommodating the spring 8 at the rear side of the guide channel 12, through holes 1e for installing the spring tightening pins 7 are arranged on the main body at the two sides of the cavity 1a, the spring tightening pins 7 can be inserted into the through holes 1e, and a blind hole 1d for installing the fixing pin 9 is also arranged.
The outer end of the plane spiral spring 6 is aligned with the rear end of the needle valve 4 and is fixedly connected with the wear-resisting block 8, preferably welded or screwed. Like this, needle valve 4 passes through wear-resisting piece 8 and the contact of spring 6 outer end, and needle valve 4 rear portion is if direct with plane spiral spring 6 contact, has the relative slip with the spring outer end when needle valve 4 back-and-forth movement, can wearing and tearing fast, fixed wear-resisting piece 8 at the spring outer end, can effectively reduce the wearing and tearing rate.
The spring tightening pin 7 is provided with a groove 7a which can accommodate the inner end of the planar spiral spring 6 and a limiting hole 7b which is communicated with the groove 7a, the outer end of the spring tightening pin 7 is also provided with a groove which is matched with a tool, and the groove 7c of the embodiment is a hexagonal groove or can be in other shapes which can be corresponding to the tool so as to transmit torque through the rotation of the groove 7c by the tool.
The fixing pin 9 is provided with a front section 9a, a middle section 9b and a rear section 9d with different diameters, the front section 9a is larger than the middle section 9b and smaller than the rear section 9c, three steps are formed, and the fixing pin 9 is inserted into the limit hole 7b of the spring tightening pin 7 and then inserted into the blind hole 1d of the main body for fixing.
The rear section 9c of the fixing pin 9 is provided with a through hole 9d, and the fixing pin 9 can be pulled out by inserting a tool into the through hole 9 d.
When the flat spiral spring 6 is installed, the flat spiral spring 6 is firstly placed in the cavity 1a of the main body, the spring tightening pin 7 penetrates from the outer side of the main body 1 and penetrates through the inner end of the flat spiral spring 6, and the inner end of the flat spiral spring 6 is embedded into the groove 7a of the spring tightening pin 7 until the limiting hole 7b is aligned with the fixing hole 1d of the main body. The spring 6 is wound up to a predetermined torque by rotating the spring tightening pin 7 through the groove 7c, and the fixing pin 9 is inserted into the spring tightening pin hole 7 b. Removal of the external torque after tightening of the flat spiral spring 6 will rebound to the condition shown in figure 7, preventing the fixing pin 9 from backing out in use.
After the force of the rotary spring tightening pin 7 is unloaded, the planar spiral spring 6 slightly rebounds to drive the hole 7b on the spring tightening pin 7 to be misplaced with the fixed pin 9, and the fixed pin 9 cannot fall out.
The shut-off nozzle is not a completely closed system, and as the service time increases, the plastic melt flowing through the inside of the nozzle slowly seeps out of the gap between the tail of the needle valve 4 and the inner hole of the bushing 5 as the needle valve 4 moves back and forth, stays in the cavity 1a of the main body, stays for a long time, is carbonized and hardened, gradually blocks the cavity 1a of the main body for a long time, and is blocked from moving by the flat spiral spring 6, so that cleaning is needed.
The main body 1 is also provided with a through hole 1b communicated with the cavity 1a, so that the cavity 1a of the main body is easy to clean.
When regular cleaning is required, the flat spiral spring 6, the spring upper pin 7 and the fixing pin 9 are removed, and the cleaning liquid can be introduced from above through the through hole 1b to clean the cavity.
The body 1 of the nozzle is wrapped with a heating collar (not shown) which heats the nozzle to prevent cooling and curing of the plastic in the nozzle. A temperature measuring hole or a temperature measuring groove 1c can also be arranged on the main body for closed-loop control of temperature.
The nozzle is integrally arranged on a shooting table of an injection molding machine, is connected to a material pipe of the injection molding machine through an adapter 3, and is matched with an inner hole of the material pipe of the injection molding machine and connected to form a channel.
When the injection molding machine stops injecting, after the pressure in the main body is reduced, the outer end of the plane spiral spring 6 arranged in the cavity of the main body 1 is loosened and reset, the elastic force of the plane spiral spring 6 presses the needle valve 4 to the feed inlet 23 of the nozzle head 2 through the abrasion-resistant block 8 to block an injection molding channel, so that the shutoff nozzle is in a closed state.
When the injection molding machine is used for injection molding, the shutoff nozzle moves to the mold gate through the injection molding machine injection table and is compressed to the mold gate by the left side of the nozzle head 1, the pressure of plastic melt in the nozzle channel is increased, the needle valve 4 is pushed to move rightwards, the channel is opened, and meanwhile, the needle valve 4 drives the planar spiral spring 6 to continuously wind up, so that the shutoff nozzle is in an open state, and the nozzle channel is communicated with the mold channel, so that injection can be performed.
Claims (10)
1. A shutoff nozzle for injection moulding, its characterized in that: the device comprises a nozzle main body, a nozzle head, a needle valve, a plane spiral spring, a spring tightening pin and a fixing pin; the nozzle head and the main body are internally provided with a flow passage, the main body is also internally provided with a guide passage, the needle valve is arranged in the flow passage of the nozzle head and the main body, the needle valve head is provided with a needle-shaped part which is matched with a nozzle feeding hole of the nozzle head, and the tail part of the needle valve stretches into the guide passage of the main body and stretches out of the guide passage; the main body is provided with a cavity for accommodating a plane scroll spring at the rear side of the guide channel, the outer end of the plane scroll spring is aligned with the rear end of the needle valve, the inner end of the plane scroll spring is fixed on a spring tightening pin, the spring tightening pin is arranged on the main body at two sides of the cavity, the tail part of the spring tightening pin is provided with a limiting hole, and a fixing pin is inserted into the limiting hole and then fixed on the main body; when injection molding is stopped, the plane volute spring enables the needle valve to move forward to seal the nozzle head so that the needle valve cannot spray liquid in the flow channel; during injection molding, the liquid pressure in the flow channel enables the needle valve to move backwards to be away from the nozzle head, so that the needle valve can normally spray out the liquid in the flow channel.
2. A shut-off nozzle for injection molding according to claim 1, wherein: the main body is provided with a through hole for installing a spring tightening pin, the spring tightening pin is inserted into the through hole, and a blind hole is further formed for installing a fixing pin.
3. A shut-off nozzle for injection molding according to claim 1 or 2, wherein: the spring tightening pin is provided with a groove capable of accommodating the inner end of the spring and a limiting hole communicated with the groove, and the outer end of the spring tightening pin is also provided with a groove which is adaptive to the tool.
4. A shut-off nozzle for injection molding according to claim 1 or 2, wherein: the fixing pin is provided with a front section, a middle section and a rear section with different diameters, wherein the front section is larger than the middle section and smaller than the rear section, three steps are formed, and the rear section is provided with a through hole through which the fixing pin is pulled out by inserting a tool into the through hole.
5. A shut-off nozzle for injection molding according to claim 1 or 2, wherein: a bushing is also provided, which is mounted in the guide passage of the main body, and the rear of the needle valve is connected in the guide passage after passing through the bushing.
6. A shut-off nozzle for injection molding according to claim 1 or 2, wherein: the needle valve is also provided with a shaft shoulder, and when the needle valve moves backwards, the shaft shoulder can be limited by the bushing.
7. A shut-off nozzle for injection molding according to claim 1 or 2, wherein: the self-adaptive device further comprises an adaptive head, an adaptive head channel is arranged in the adaptive head, and the tail of the main body is connected with the adaptive head and communicated with the main body channel.
8. A shut-off nozzle for injection molding according to claim 1 or 2, wherein: and the needle valve is fixedly connected with the wear-resistant block.
9. A shut-off nozzle for injection molding according to claim 1 or 2, wherein: the main body is also provided with a through hole communicated with the cavity.
10. A shut-off nozzle for injection molding according to claim 1 or 2, wherein: the main body is wrapped with the heating ring and provided with a temperature measuring part for heating and controlling the temperature of the main body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222954905.5U CN218948283U (en) | 2022-11-07 | 2022-11-07 | Shut-off nozzle for injection molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222954905.5U CN218948283U (en) | 2022-11-07 | 2022-11-07 | Shut-off nozzle for injection molding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218948283U true CN218948283U (en) | 2023-05-02 |
Family
ID=86106993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222954905.5U Active CN218948283U (en) | 2022-11-07 | 2022-11-07 | Shut-off nozzle for injection molding |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218948283U (en) |
-
2022
- 2022-11-07 CN CN202222954905.5U patent/CN218948283U/en active Active
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