CN220314077U - Injection molding screw structure for preventing backflow - Google Patents
Injection molding screw structure for preventing backflow Download PDFInfo
- Publication number
- CN220314077U CN220314077U CN202321216172.3U CN202321216172U CN220314077U CN 220314077 U CN220314077 U CN 220314077U CN 202321216172 U CN202321216172 U CN 202321216172U CN 220314077 U CN220314077 U CN 220314077U
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- Prior art keywords
- tray body
- accommodating cavity
- screw
- rear tray
- screw rod
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- 238000001746 injection moulding Methods 0.000 title abstract description 10
- 230000008676 import Effects 0.000 claims abstract description 5
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims description 2
- 229920003023 plastic Polymers 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 239000002994 raw material Substances 0.000 abstract description 34
- 230000000694 effects Effects 0.000 abstract description 3
- 239000007921 spray Substances 0.000 abstract 1
- 239000011797 cavity material Substances 0.000 description 41
- 230000004308 accommodation Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The utility model discloses an injection molding screw structure for preventing countercurrent, which comprises a screw body, a screw head arranged at the front end of the screw body, an inlet, an outlet and a containing cavity communicated with the inlet and the outlet, wherein a front tray body and a rear tray body are arranged in the containing cavity, the rear tray body is movably matched with the containing cavity, the front tray body and the rear tray body are respectively provided with an aligned circulation hole, a reset spring is arranged between the two tray bodies, and a blade is arranged on the rear tray body. The raw materials that the screw rod body was carried forward gets into the chamber of holding through the import, and drive vane, back disk body are rotatory relative preceding disk body, and reset spring compresses, and the circulation hole aligns, and the raw materials is discharged the chamber of holding through the circulation mouth, sprays into the die cavity. The raw material pressure is insufficient, or the raw material flows back, then, under reset spring's drive, the rotatory reset of back disk body, the circulation hole dislocation plays the effect that the raw material was stopped contrary. Compared with the prior art, the non-return structure of this design is stable and sealed respond well.
Description
Technical Field
The utility model relates to an injection molding machine, in particular to an injection molding screw barrel.
Background
When the screw is used for conveying raw materials, after the screw drives the raw materials to enter the die cavity, the raw materials are compressed by the rotation of the screw, so that the pressure around the screw is increased, and the raw materials on the screw are easy to flow reversely when the pressure is overlarge.
The patent document with the publication number of CN 113799347A discloses a screw structure for an injection molding machine, which comprises an injection molding pipeline, wherein the injection molding pipeline is internally connected with a screw, one end of the screw is connected with a check joint, one side of the check joint is provided with a feed inlet, the other end of the check joint is provided with a check hole, one side of the check joint is provided with a positioning block, and the positioning block is embedded and connected to one side of the inside of the screw. When the screw rod rotates, raw materials can be conveyed forwards, after the raw materials in the die cavity are filled, the screw rod continues to rotate to convey the raw materials, when the pressure in the die cavity is larger than the pressure of the raw materials conveyed by the screw rod, the raw materials in the die cavity can move towards the inside of the material guide cavity through the countercurrent hole, and when the raw materials move towards the inside of the guide cavity, the baffle plate can be driven to move towards one side of the plug, so that the plug is clamped in the center of the baffle plate to seal the inside of the material guide cavity, and the raw materials are prevented from countercurrent.
When the baffle in the patent document is far away from the plug, a gap is formed between the baffle and the plug, and raw materials from the screw are conveyed forwards through the gap. When the pressure in the die cavity is increased, the baffle plate retreats and is matched with the plug to seal the gap. In order to enable the baffle plate to displace in the guide cavity, the baffle plate is in clearance fit with the guide cavity; the central hole of the baffle needs to be tightly matched with the plug to effectively close the gap between the plug and the baffle. Thus, there are the following technical problems: the baffle may be inclined at a small angle during displacement along the guide chamber, but the small angle may result in the central aperture of the baffle not being able to mate with the plug. In addition, the raw material may leak through the gap between the baffle plate and the inner wall of the guide chamber.
Disclosure of Invention
The technical problems solved by the utility model are as follows: the non-return structure is stable in structure and good in sealing effect, and is applied to the head of the injection molding screw.
In order to solve the technical problems, the utility model provides the following technical scheme: prevent against current screw rod structure of moulding plastics, including the screw rod body, set up the screw rod head at screw rod body front end, be equipped with import and row's mouth on the screw rod head, and, the intercommunication is imported and is arranged the chamber of holding of mouth, hold the intracavity and be equipped with preceding disk body and back disk body, back disk body and hold chamber clearance fit, be equipped with first circulation hole on the preceding disk body, be equipped with the second circulation hole that can align with first circulation hole on the back disk body, be equipped with reset spring between preceding disk body and the back disk body, this reset spring can make the rotatory back disk body of relative preceding disk body reset, be equipped with the blade on the back disk body.
According to the technical scheme, raw materials conveyed forward by the screw body enter the accommodating cavity through the inlet, the blades are driven to drive the rear disc body to rotate relative to the front disc body, the rear disc body compresses the reset spring, the first flow holes are aligned with the second flow holes, the raw materials flow to the front of the front disc body through the first flow holes and the second flow holes, then are discharged out of the accommodating cavity through the discharge port, and are injected into the die cavity.
If the pressure of the raw material conveyed forward by the screw body is insufficient, or the raw material in the accommodating cavity flows back, the rear tray body is rotated and reset under the drive of the reset spring, the first flow hole is not aligned with the second flow hole any more, the front tray body seals the second flow hole, and the rear tray body seals the first flow hole, so that the raw material non-return function is realized.
The circulation and non-return functions of the raw materials are completed by the alignment and dislocation of the first flow hole and the second flow hole, and the alignment and dislocation of the first flow hole and the second flow hole are realized by the rotation of the rear disc body, which is different from the opening and closing of the gap realized by the translation of the baffle plate relative to the plug in the prior art. Compared with the prior art, the utility model has stable non-return structure and good sealing effect.
The front tray body is tightly matched with the accommodating cavity, specifically, the outer ring of the front tray body is tightly matched with the inner wall of the accommodating cavity, and the front tray body cannot rotate relative to the accommodating cavity.
The front disc body is provided with a first spring groove, the rear disc body is provided with a second spring groove, and the reset spring is matched in the first spring groove and the second spring groove. The first spring groove and the second spring groove are combined into a cuboid space, and the reset spring is positioned in the cuboid space. The number of the first spring grooves and the second spring grooves are several, and the number of the first spring grooves and the second spring grooves are equal. The first spring grooves are distributed along the circumferential direction of the front disc body, and the second spring grooves are distributed along the circumferential direction of the rear disc body.
The screw head comprises a front half part and a rear half part, wherein the front half part is provided with a front accommodating cavity, the rear half part is provided with a rear accommodating cavity, and the front accommodating cavity and the rear accommodating cavity form the accommodating cavity. The front half part is provided with external threads, the rear half part is provided with internal threads, and the front half part and the rear half part are connected together through threads. The screw head is divided into a front half part and a rear half part, which is convenient for processing the accommodating cavity and is convenient for installing the front disc body and the rear disc body.
A limiting ring is arranged in the front accommodating cavity, and the front tray body is propped against the limiting ring. The limiting ring is positioned on the front wall of the front accommodating cavity, and the front face of the front tray body is propped against the limiting ring, so that a gap is formed between the front tray body and the front wall of the front accommodating cavity, and raw materials coming out from the first flow holes on the front tray body enter the gap and then flow into the exhaust port on the front wall of the front accommodating cavity.
The center position of back disk body is equipped with hemisphere structure, and hemisphere structure offsets with the back wall that holds the chamber. The front tray body is matched in the front accommodating cavity, the rear tray body is abutted against the front tray body surface and the rear tray body surface, the hemispherical structure is positioned at the rearmost part of the rear tray body, when the front half part and the rear half part of the screw head are in threaded connection, the rear wall of the rear accommodating cavity is abutted against the hemispherical structure, so that the front tray body and the rear tray body which are spliced together are abutted against the limiting ring, the rear part of the front tray body and the rear wall of the rear accommodating cavity are abutted against, and the front tray body and the rear tray body can be kept close together.
The inlet is inclined, and the inclination is not only front-back direction inclination, but also left-right direction inclination, and the rotation of the rear tray body relative to the front tray body is left rotation or right rotation. Raw materials from the screw body enter the inclined inlet, acting force is applied to the blades, so that the blades are easy to rotate, and after the blades rotate, the first flow holes are aligned with the second flow holes.
Drawings
The utility model is further described with reference to the accompanying drawings:
FIG. 1 is a schematic view of an injection screw configuration for preventing reverse flow;
FIG. 2 is a schematic view of a screw head;
FIG. 3 is a cross-sectional view of a screw head;
FIG. 4 is an exploded view of a screw head;
FIG. 5 is a schematic view of the rear tray;
FIG. 6 is a schematic view of the rear half of the screw head;
FIG. 7 is a front view of the rear half of the screw head;
fig. 8 is a left side view of fig. 7.
The symbols in the drawings illustrate:
10. a screw body;
20. a screw head; 201. a front half; 202. a rear half; 21. an inlet; 22. a discharge port; 23. a receiving chamber; 24. a front accommodating chamber; 25. a rear accommodation chamber; 26. a limiting ring; 27. a connecting part connected with the screw body;
30. a front tray body; 31. a first flow hole; 32. a first spring groove;
40. a rear tray body; 41. a second flow hole; 42. a blade; 43. a second spring groove; 44. a hemispherical structure;
50. and a return spring.
Detailed Description
Referring to fig. 1, 3 and 4, the injection molding screw structure for preventing countercurrent comprises a screw body 10, a screw head 20 arranged at the front end of the screw body, an inlet 21, an outlet 22 and a containing cavity 23 communicated with the inlet and the outlet, wherein a front tray body 30 and a rear tray body 40 are arranged in the containing cavity, the rear tray body is movably matched with the containing cavity, a first flow hole 31 is arranged on the front tray body, a second flow hole 41 which can be aligned with the first flow hole is arranged on the rear tray body, a reset spring 50 is arranged between the front tray body and the rear tray body, and the reset spring can reset the rear tray body rotating relative to the front tray body, and a blade 42 is arranged on the rear tray body.
The raw materials that the screw body 10 carried forward get into and hold the chamber 23 through the import 21, drive the blade 42, the blade drives back disk body 40 and rotates relative front disk body 30, back disk body 40 compresses reset spring 50, first circulation hole 31 aligns with second circulation hole 41, and the raw materials flows to the place ahead of front disk body 30 through first circulation hole 31 and second circulation mouth 41, again through discharge port 22 discharge hold chamber 23, jet into the die cavity.
If the pressure of the raw material fed forward by the screw body 10 is insufficient or the raw material in the accommodating chamber 23 is refluxed, the rear tray 40 is rotationally reset by the drive of the reset spring 50, the first flow hole 31 is no longer aligned with the second flow hole 41, the front tray 30 closes the second flow hole 41, and the rear tray 40 closes the first flow hole 31, thus functioning as a raw material stopper.
The front tray 30 is tightly fitted with the accommodating chamber 23, specifically, the outer ring of the front tray 30 is tightly fitted with the inner wall of the accommodating chamber 23, and the front tray 30 does not rotate relative to the accommodating chamber 23.
The front tray body 30 is provided with a first spring groove 32, the rear tray body 40 is provided with a second spring groove 43, and the return spring 50 is matched with the first spring groove and the second spring groove. The first spring groove 32 and the second spring groove 43 compose a rectangular parallelepiped space in which the return spring 50 is located. The number of the first spring grooves 32 and the second spring grooves 43 is several, and the number of the first spring grooves 32 and the second spring grooves 43 is equal. The plurality of first spring grooves 32 are distributed along the circumferential direction of the front disc 30, and the plurality of second spring grooves 43 are distributed along the circumferential direction of the rear disc 40.
The screw head 20 comprises a front half 201, which is provided with a front accommodation chamber 24, and a rear half 202, which is provided with a rear accommodation chamber 25, which constitute the accommodation chamber 23. The front half 201 is provided with external threads and the rear half 202 is provided with internal threads, the front half 201 and the rear half 202 being screwed together. The screw head 20 is divided into a front half 201 and a rear half 202, which facilitate the processing of the receiving chamber 23 and the installation of the front and rear discs 30 and 40.
A limiting ring 26 is arranged in the front accommodating cavity 24, and a front disc body 30 is propped against the limiting ring. The limiting ring 26 is located on the front wall of the front accommodating cavity 24, and the front face of the front tray body 30 is pressed against the limiting ring 26, so that a gap is formed between the front tray body 30 and the front wall of the front accommodating cavity 24, and after the raw material coming out through the first flow holes 31 on the front tray body 30 enters the gap, the raw material flows into the discharge port 22 on the front wall of the front accommodating cavity 24.
The center of the rear tray 40 is provided with a hemispherical structure 44 which abuts against the rear wall of the accommodating chamber 23. The front tray 30 is fitted in the front accommodating cavity 24, the rear tray 40 is close to the front tray 30, the hemispherical structure 44 is located at the rearmost part of the rear tray 40, when the front half 201 and the rear half 202 of the screw head 20 are screwed together, the rear wall of the rear accommodating cavity 25 abuts against the hemispherical structure 44, so that the front tray 30 and the rear tray 40 which are spliced together abut against the limiting ring 26 at the front and the rear wall of the rear accommodating cavity 25, and the front tray 30 and the rear tray 40 can be kept close together.
Referring to fig. 6 to 8, the inlet 21 is inclined in a front-rear direction and in a left-right direction, and the rear tray 40 is rotated left or right with respect to the front tray 30. Raw material from the screw body 10 enters the inclined inlet 21 and applies a force to the vane 42 to facilitate rotation of the vane 42, after which the first flow hole 31 is aligned with the second flow hole 41.
The foregoing is merely illustrative of the preferred embodiments of the present utility model, and modifications in detail will readily occur to those skilled in the art based on the teachings herein without departing from the spirit and scope of the utility model.
Claims (7)
1. Prevent screw rod structure of moulding plastics against current, including screw rod body (10), set up screw rod head (20) at screw rod body front end, be equipped with import (21) and discharge (22) on the screw rod head to and, intercommunication import and discharge hold chamber (23), its characterized in that: the accommodating cavity is internally provided with a front tray body (30) and a rear tray body (40), the rear tray body is movably matched with the accommodating cavity, the front tray body is provided with a first flow hole (31), the rear tray body is provided with a second flow hole (41) which can be aligned with the first flow hole, a reset spring (50) is arranged between the front tray body and the rear tray body, the reset spring can reset the rear tray body which rotates relative to the front tray body, and the rear tray body is provided with blades (42).
2. The backflow preventing injection screw structure of claim 1, wherein: the front tray body (30) is tightly matched with the accommodating cavity (23).
3. The backflow preventing injection screw structure of claim 1, wherein: a first spring groove (32) is formed in the front disc body (30), a second spring groove (43) is formed in the rear disc body (40), and a return spring (50) is matched in the first spring groove and the second spring groove.
4. The backflow preventing injection screw structure of claim 1, wherein: the screw head (20) comprises a front half part (201) and a rear half part (202), wherein the front half part is provided with a front accommodating cavity (24), the rear half part is provided with a rear accommodating cavity (25), and the front accommodating cavity and the rear accommodating cavity form the accommodating cavity (23).
5. The backflow preventing injection screw structure of claim 4, wherein: a limiting ring (26) is arranged in the front accommodating cavity (24), and the front tray body (30) is propped against the limiting ring.
6. The backflow preventing injection screw structure of claim 1, wherein: a hemispherical structure (44) is arranged at the center of the rear tray body (40), and the hemispherical structure is propped against the rear wall of the accommodating cavity (23).
7. The backflow preventing injection screw structure of claim 1, wherein: the inlet (21) is arranged obliquely.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321216172.3U CN220314077U (en) | 2023-05-19 | 2023-05-19 | Injection molding screw structure for preventing backflow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321216172.3U CN220314077U (en) | 2023-05-19 | 2023-05-19 | Injection molding screw structure for preventing backflow |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220314077U true CN220314077U (en) | 2024-01-09 |
Family
ID=89411459
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321216172.3U Active CN220314077U (en) | 2023-05-19 | 2023-05-19 | Injection molding screw structure for preventing backflow |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220314077U (en) |
-
2023
- 2023-05-19 CN CN202321216172.3U patent/CN220314077U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant |