CN217834615U

CN217834615U - Non-return injection molding screw capable of preventing material backflow

Info

Publication number: CN217834615U
Application number: CN202221709431.1U
Authority: CN
Inventors: 夏瑜键; 夏增富
Original assignee: ZHEJIANG HUAYE PLASTIC MACHINERY CO Ltd
Current assignee: ZHEJIANG HUAYE PLASTIC MACHINERY CO Ltd
Priority date: 2022-07-01
Filing date: 2022-07-01
Publication date: 2022-11-18
Anticipated expiration: 2032-07-01

Abstract

The utility model provides a can prevent contrary screw rod of moulding plastics of material refluence, including the body of rod and spiral shell arris, tip at the body of rod is provided with backstop, backstop includes loose ring and screw rod head, the screw rod head includes the cylinder, the setting is at the discharge end of cylinder one end and the link of setting at the cylinder other end, tip at the body of rod is provided with the spread groove that can peg graft fixed connection end, the link is connected in the spread groove, the loose ring cup joints on the cylinder, the length of loose ring is less than the distance between discharge end terminal surface and the body of rod terminal surface, leave the logical material chamber that can pass through the material between the inner wall of loose ring and the outer wall of the body of rod. The utility model has the advantages of: the screw heads are connected by threads, so that the screw is very convenient to mount and dismount; increase mixing shearing mechanism on the body of rod, can make and melt to this regional plastics and further obtain the shearing, play the effect that improves the plastify to a great extent has reduced the volume when the melt passes through front end non return means, has played accurate effect more to the accuracy control of activity ring.

Description

Non-return injection molding screw capable of preventing material backflow

Technical Field

The utility model relates to a screw rod preparation technical field especially indicates a can prevent end-stop screw rod of moulding plastics of material refluence.

Background

The utility model discloses a chinese utility model patent of current application number CN201120358600.7 named "a special screw check valve of injection molding machine PP material" discloses a special screw check valve of injection molding machine PP material, its characterized in that: the check valve comprises a check valve body in transmission connection with a screw, a glue passing head fixed at the front end of the check valve body, a check washer arranged at the front part of the check valve body, a check ring arranged between the check washer and the glue passing head and a slot arranged between the check ring and the check valve body; two contact surfaces are arranged between the non-return gasket and the non-return ring, and the contact surfaces are planes or cylindrical surfaces. Due to the adoption of the technical scheme, the utility model discloses carry out optimal design to check valve subassembly, increased the spring design, make the check valve needle can close the check valve rapidly after the melten gel finishes, guaranteed to penetrate the steady of gluing, prevent the backward flow of sizing material. However, the check valve body is inconvenient to install, and the material shearing effect is still not ideal enough, so the structure of the screw adopting the check valve is required to be further improved.

Disclosure of Invention

The utility model aims to solve the technical problem that it is effectual to provide a material shearing to above-mentioned prior art current situation, backstop device simple to operate's the screw rod of moulding plastics that ends that can prevent the material refluence.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: this can prevent end-stop screw rod of moulding plastics of material refluence, including the body of rod and the spiral shell arris of setting on the body of rod the tip of the body of rod is provided with end stop, its characterized in that: the non-return device comprises a movable ring and a screw head, wherein the screw head comprises a cylinder, a discharge end and a connecting end, the discharge end is arranged at one end of the cylinder, the connecting end is arranged at the other end of the cylinder, the end part of the rod body is provided with a connecting groove, the connecting end is connected with the connecting groove, the movable ring is sleeved on the cylinder, the length of the movable ring is smaller than the distance between the end surface of the discharge end and the end surface of the rod body, and a material passing cavity capable of passing through materials is reserved between the inner wall of the movable ring and the outer wall of the rod body.

As a refinement, a connecting thread can preferably be provided on the outer wall of the connecting end, and a corresponding groove inner wall thread is provided on the inner wall of the connecting groove, in which the connecting end is screwed.

The improved screw rod is characterized in that a rod body bulge for material mixing and shearing can be preferably arranged on the rod body between the end part of the screw edge and the screw head, the outer diameter of the rod body bulge is larger than the diameter of the rod body, and diversion grooves are circumferentially distributed on the outer wall of the rod body bulge at intervals.

In a further improvement, the flow guide groove can be a spiral curved groove.

In a further improvement, a second screw edge can be preferably arranged on the surface of the rod body close to the protrusion of the rod body, and the axial distance between the second screw edge and the screw edge at the corresponding position is gradually increased along the direction pointing to the screw head at the tail part of the rod body.

In a further development, the pitch of the second ridges at the initial position of the second ridges may preferably be 70mm, and the overall length of the second ridges is 210mm.

Further improved, the axial section of the screw ridge can be preferably small at the top end and large at the root, and the included angle between the rear side wall of the screw ridge and the outer surface of the rod body is 120 degrees.

Further improved, the included angle between the front side wall of the screw edge corresponding to the blanking position and the outer surface of the rod body can be preferably smaller than 90 degrees.

In a further improvement, the included angle between the front side wall of the screw edge corresponding to the blanking part and the outer surface of the rod body can be preferably 87 degrees.

As a modification, the surface of the rod body provided with the screw flight and the surface of the screw flight may preferably be provided with a nitrided layer.

Compared with the prior art, the utility model has the advantages of: the screw head is connected by screw thread, so that the assembly and disassembly are very convenient; the mixing and shearing structure is added on the rod body, so that the plastic melted to the area can be further sheared, the plasticizing effect is improved, the volume of the melted material passing through the front end check device is reduced to a great extent, and the precision control of the movable ring is more accurate; the second screw ridge gradually separated from the screw ridge is arranged on the rod body close to the screw head, so that the plastic in a semi-molten state has a solid-liquid separation effect, and along with the change of the lead and the bottom diameter of the second screw ridge, a part of the molten plastic smoothly enters the liquid phase tank, the incompletely molten plastic further has a strong compression effect along with the change of the bottom diameter of the screw ridge, the plastic shearing and compression effect is strengthened to the maximum extent, and for most of plastics needing the strong shearing effect, the structure can play a key role; the contained angle of the preceding lateral wall of the spiral shell arris that corresponds with unloading department and body of rod surface is less than 90 degrees, reduces the driving force that this angle can the every rotatory a week of enhancement screw rod of to a great extent brought plastics, can improve plastics and retrieve plastics unloading difficult phenomenon at to a great extent.

Drawings

Fig. 1 is a perspective view of an embodiment of the present invention;

FIG. 2 is an exploded view of the structure of FIG. 1;

fig. 3 is a cross-sectional view taken along the plane of the central axis in fig. 1.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

As shown in fig. 1 to 3, the non-return injection screw capable of preventing material backflow of this embodiment includes a rod body 1 and screw ridges 10 disposed on the rod body 1, a non-return device is disposed at an end of the rod body 1, the non-return device includes a movable ring 2 and a screw head 3, the screw head 3 includes a cylinder, a discharge end disposed at one end of the cylinder and a connection end disposed at the other end of the cylinder, a connection groove capable of being inserted into the fixed connection end is disposed at an end of the rod body 1, the connection end is connected in the connection groove, the movable ring 2 is sleeved on the cylinder, a length of the movable ring 2 is smaller than a distance between a discharge end face and a rod body end face, and a material passing cavity capable of passing through a material is disposed between an inner wall of the movable ring 2 and an outer wall of the rod body 1. The outer wall of the connecting end is provided with connecting threads, the inner wall of the connecting groove is provided with corresponding inner wall threads, and the connecting end is screwed in the connecting groove.

The rod body 1 between the end part of the screw edge and the screw head 3 is provided with a rod body bulge 11 for material mixing and shearing, the outer diameter of the rod body bulge 11 is larger than the diameter of the rod body 1, and diversion trenches are circumferentially distributed on the outer wall of the rod body bulge 11 at intervals. The diversion trench is a spiral curved trench. A second screw rib 12 is arranged on the surface of the rod body close to the rod body bulge 11, and the axial distance between the second screw rib 12 and the screw rib 10 at the corresponding position is gradually increased along the direction from the tail part of the rod body to the screw head 3. The pitch of the second ridges at the initial position of the second ridges is 70mm, and the overall length of the second ridges is 210mm.

The top end of the axial section of the screw ridge 10 is small, the root part is large, and the included angle a between the rear side wall of the screw ridge 10 and the outer surface of the rod body is 120 degrees. The included angle b between the front side wall of the screw edge 10 corresponding to the blanking position and the outer surface of the rod body is smaller than 90 degrees. The included angle b between the front side wall of the screw edge 10 corresponding to the blanking position and the outer surface of the rod body is 87 degrees. The surface of the rod body 1 provided with the screw edge 10 and the surface of the screw edge 10 are provided with nitride layers.

Claims

1. The utility model provides a can prevent contrary screw rod of moulding plastics of material refluence, includes the body of rod (1) and sets up spiral shell arris (10) on the body of rod (1) the tip of the body of rod (1) is provided with backstop, its characterized in that: non-return device includes activity ring (2) and screw rod head (3), screw rod head (3) include the cylinder, set up at the discharge end of cylinder one end and set up the link at the cylinder other end the tip of the body of rod (1) is provided with the spread groove that can peg graft the fixed connection end, the link is connected in the spread groove, activity ring (2) cup joint on the cylinder, the length of activity ring (2) is less than the distance between discharge end terminal surface and the body of rod terminal surface, leaves the logical material chamber that can pass through the material between the inner wall of activity ring (2) and the outer wall of the body of rod (1).

2. A non-return injection screw according to claim 1, characterized in that: the connecting structure is characterized in that connecting threads are arranged on the outer wall of the connecting end, corresponding groove inner wall threads are arranged on the inner wall of the connecting groove, and the connecting end is screwed in the connecting groove.

3. A non-return injection screw according to claim 1 or 2, characterized in that: the screw rod is characterized in that a rod body bulge (11) for material mixing and shearing is arranged on the rod body (1) between the end part of the screw rib and the screw rod head (3), the outer diameter of the rod body bulge (11) is larger than the diameter of the rod body (1), and guide grooves are distributed on the outer wall of the rod body bulge (11) at intervals.

4. The non-return injection screw according to claim 3, characterized in that: the diversion trench is a spiral curved trench.

5. A non-return injection screw according to claim 3, characterized in that: a second screw rib (12) is arranged on the surface of the rod body close to the rod body protrusion (11), and the axial distance between the second screw rib (12) and the screw rib (10) at the corresponding position is gradually increased along the direction of the tail part of the rod body pointing to the screw head (3).

6. The non-return injection screw according to claim 5, characterized in that: the pitch of the second ridges at the initial position of the second ridges is 70mm, and the overall length of the second ridges is 210mm.

7. Non-return injection screw according to claim 1 or 2, characterized in that: the axial cross section of the screw rib (10) is small at the top end and large at the root, and the included angle (a) between the rear side wall of the screw rib (10) and the outer surface of the rod body is 120 degrees.

8. A non-return injection screw according to claim 7, characterized in that: the included angle (b) between the front side wall of the screw edge (10) corresponding to the blanking position and the outer surface of the rod body is less than 90 degrees.

9. A non-return injection screw according to claim 8, characterized in that: the included angle (b) between the front side wall of the screw edge (10) corresponding to the blanking position and the outer surface of the rod body is 87 degrees.

10. Non-return injection screw according to claim 1 or 2, characterized in that: and nitriding layers are arranged on the surface of the rod body (1) provided with the screw edge (10) and the surface of the screw edge (10).