WO2020238755A1

WO2020238755A1 - Screw check ring mechanism for injection molding machine

Info

Publication number: WO2020238755A1
Application number: PCT/CN2020/091551
Authority: WO
Inventors: 徐锡东
Original assignee: 徐锡东
Priority date: 2019-05-31
Filing date: 2020-05-21
Publication date: 2020-12-03

Abstract

The present invention relates to a screw check ring mechanism for an injection molding machine, comprising a check ring, a first opening is provided penetrating through the check ring in the axial direction, and further comprising an auxiliary ring. The check ring comprises a first ring body and a second ring body, and the outer diameter of the first ring body is greater than that of the second ring body. The auxiliary ring is fitted over the second ring body. A second opening is provided penetrating through the auxiliary ring in the axial direction, and the second opening and the first opening are staggered. The beneficial effect of the present invention is that: with respect to a conventional check ring, the check ring mechanism provided by the present invention not only improves the airtightness, which guarantees an injection molding pressure inside the injection molding machine and other important factors to ensure the quality of products, but also reduces wear, and ensures that the check ring and a barrel in the injection molding machine have a longer service life compared with existing check rings and barrels, the production costs are reduced, the stability in a relatively longer period of time during production is ensured, and a situation of frequently replacing the check ring or the barrel would not appear.

Description

Screw non-return ring mechanism for injection molding machine

Technical field

The invention relates to the field of injection molding machines, in particular to a screw non-return ring mechanism for injection molding machines.

Background technique

Injection molding machine, also known as injection molding machine or injection machine, is the main molding equipment that uses plastic molding molds to make thermoplastic or thermoset plastics into various shapes of plastic products. The screw non-return ring of the injection molding machine is one of the important internal parts of the injection molding machine, which is related to the sealing effect of the injection molding machine during injection, and then affects the injection pressure and other factors, which determines the performance of an injection molding machine to a certain extent. .

The existing non-return ring is generally in the shape of a circular ring cylinder, with a bell mouth at the end close to the screw head, and some with a flat mouth or a bell mouth at the other end. When working, the non-return ring moves axially in the barrel with the screw, the outer circular wall of the non-return ring abuts the inner circular wall of the barrel, and the gap between the two circular walls (hereinafter collectively referred to as the ring barrel gap ) Is to rely on the non-return ring to seal.

In order to improve the performance of injection molding, it is reasonable to say that the ring cylinder gap should be as small as possible. However, due to the large difference in the deformation of the non-return ring and the barrel under the influence of temperature, and when different materials are used to produce different products, the required working temperature and pressure are different, plus the influence of processing errors , The overall result in the actual use of the ring cylinder gap will produce very large fluctuations, difficult to control. If the ring cylinder gap is made too small, it may become smaller under the influence of the above factors, so that the non-return ring cannot slide normally in the barrel, and both will have different degrees of wear, resulting in service life Greatly reduced, and seriously affected the product quality. If the ring-cylinder gap is made too large, it may become larger under the influence of the above-mentioned multiple factors, which will lead to the failure to ensure the sealing performance, which will affect the injection pressure and ultimately seriously affect the product quality.

The current solution to the above problems is mainly to improve the material performance and processing accuracy of the non-return ring and the barrel, which will lead to a significant increase in costs. At the same time, the solution to this problem through this solution has approached the limit, but the effect is still not reached. expected.

Summary of the invention

In order to overcome the above shortcomings of the prior art, the present invention provides a screw non-return ring mechanism for an injection molding machine. It can make the non-return ring deform and increase the outer diameter when the injection molding machine is in the injection state, so that the outer circular wall of the non-return ring and the inner circular wall of the barrel change from traditional rigid abutment to elastic abutment. The anti-reverse ring can still slide smoothly when the gap of the ring cylinder is small enough to approach zero. When the injection molding machine is not in the injection state, the non-return ring can rely on its own resilience to shrink the outer diameter back to its original size, which can not only ensure the sealing performance of the injection molding machine, but also reduce the wear between the non-return ring and the barrel. .

The technical solution of the present invention to solve its technical problem is: a screw non-return ring mechanism for an injection molding machine, including a non-return ring, a first opening penetrates in the axial direction of the non-return ring, and an auxiliary ring, so The check ring includes a first ring body and a second ring body, and the outer diameter of the first ring body is larger than that of the second ring body, and the auxiliary ring is sleeved on the second ring body Above, a second opening penetrates through the auxiliary ring in the axial direction, and the second opening is staggered from the first opening. When the injection molding machine is in the injection state, the non-return ring deforms through the first opening to increase the outer diameter, so that the ring barrel gap is small to close to zero and the non-return ring can still slide smoothly, while ensuring high sealing performance. When the injection molding machine is not in the injection state, the non-return ring can rely on its own resilience to shrink the outer diameter back to its original size. And the arrangement of the auxiliary ring prevents the raw material from leaking from the first opening.

Preferably, the first opening is linear or arc-shaped or a combination of the two.

Further, the outer diameter of the auxiliary ring is the same as the outer diameter of the first ring body, and the thickness of the auxiliary ring is the same as the height of the second ring body. Therefore, the overall shape and size of the non-return ring combined with the auxiliary ring are consistent with the overall shape and size of the original non-return ring.

Preferably, the second opening is linear or arc-shaped or a combination of the two.

Further, the non-return ring mechanism further includes a sealing ring, and the sealing ring is located between the non-return ring and the screw gasket on the screw of the injection molding machine. The sealing ring can prevent the possibility of material leakage when the second ring body on the non-return ring is larger than the screw gasket.

Preferably, the outer diameter of the sealing ring is the same as the outer diameter of the first ring body, and the inner diameter of the sealing ring is the same as the inner diameter of the check ring.

Another technical solution of the present invention is: a screw non-return ring mechanism for an injection molding machine, including a non-return ring, an auxiliary ring and a sealing ring, the non-return ring includes a first ring body and a second ring body, the The auxiliary ring is sleeved on the second ring body, the non-return ring is axially penetrated with at least two first openings, and the auxiliary ring is axially penetrated with at least two second openings, The second opening and the first opening are arranged alternately, the check ring is divided into a plurality of check ring segments through the first opening, and the plurality of check ring segments are all connected with the sealing ring. Compared with the previous solution, the first opening is divided into multiple, so as to achieve a better deformation effect.

Further, the inner ring of the second ring body is provided with a first annular groove, the front end of the sealing ring is provided with a first annular protrusion, and the first annular protrusion is clamped into the first annular groove. In the groove. The above is one of the connecting structures of the second ring body and the sealing ring. Through the above arrangement, the non-return ring is prevented from being split into multiple non-return ring segments by the first openings.

Further, the outer ring of the second ring body is axially provided with a first arc groove, the inner ring of the auxiliary ring is axially provided with a first positioning rib, and the first positioning rib is inserted into the first Inside the arc groove. The above is one of the connecting structures of the second ring body and the auxiliary ring. Through the above arrangement, the rotation and cracking of the second opening are prevented from contacting the first opening to cause leakage of raw materials.

Preferably, the first ring body and the second ring body are arranged separately, the inner ring of the second ring body is provided with a second annular groove, and the rear end of the first ring body is provided with a second annular protrusion. As a result, the second annular protrusion is locked into the second annular groove. Considering that the screw on the screw will go back and rotate when resetting, the screw head may be stuck on the first opening to drive the non-return ring mechanism to rotate together. When rotating, the outer wall of the non-return ring and the auxiliary ring will interact with the material. The inner wall of the cylinder is rubbed to produce a certain degree of wear, which greatly reduces the service life of the non-return ring, auxiliary ring and the barrel. Therefore, the first ring body and the second ring body are arranged separately, and the first opening is provided on the second ring body. It is not provided on the first ring body, and is connected and fixed by the above-mentioned connecting structure.

Further, the auxiliary ring is radially divided to form a first auxiliary ring segment and a second auxiliary ring segment, and the second opening is divided to form a third opening passing through the first auxiliary ring segment and a third opening passing through the second auxiliary ring segment. The fourth opening on the auxiliary ring segment, the third opening and the fourth opening are staggered. Considering that after the first ring body and the second ring body are separated, the first ring body will not be deformed. Therefore, the outer diameter of the first ring body will be smaller than the outer diameter of the auxiliary ring because it is not deformed during use. At this time, the injection material will leak from the second opening of the auxiliary ring. In order to avoid this situation, the auxiliary ring is also divided into the first auxiliary ring segment and the second auxiliary ring segment. After the third opening on the ring segment and the fourth opening on the second auxiliary ring segment are alternately arranged, the material will be blocked on the second auxiliary ring segment after entering the third opening.

Further, the outer ring of the second ring body is axially provided with a second positioning rib and a third positioning rib, the inner ring of the first auxiliary ring segment is provided with a second arc groove, and the second auxiliary ring segment The inner ring is provided with a third arc groove, the second positioning rib is inserted into the second arc groove, the third positioning rib is inserted into the third arc groove, the above is the first The specific connection structure of an auxiliary ring segment and a second auxiliary ring segment on the check ring.

Further, the first opening and the second opening are both straight lines, circular arcs or curved lines.

Further, the outer diameters of the first ring body, the auxiliary ring and the sealing ring are the same, the inner diameter of the second ring body and the sealing ring are the same, and the inner diameter of the sealing ring is smaller than the screw pad on the screw for the injection molding machine The outer diameter of the sheet.

The beneficial effect of the present invention is that compared with the traditional non-return ring, the non-return ring mechanism provided by the present invention not only improves the sealing performance, but also ensures that the injection pressure and other important factors inside the injection molding machine are well protected, thereby ensuring The quality of the product can also reduce wear and tear, ensure that the non-return ring and the barrel in the injection molding machine have a longer service life than the original, reduce production costs, and ensure the stability during production for a long period of time , Without frequent replacement of check ring or barrel.

Description of the drawings

Figure 1 is an internal cross-sectional view of the first embodiment of the present invention when running in a barrel.

Fig. 2 is a schematic structural diagram of the first embodiment of the present invention.

Fig. 3 is a schematic structural view of the first opening on the non-return ring in the first embodiment of the present invention.

4 is a schematic diagram of the structure of the non-return ring in the first embodiment of the present invention.

Fig. 5 is a schematic diagram of the structure of the non-return ring in the first embodiment of the present invention during welding.

Figure 6 is an internal cross-sectional view of the second embodiment of the present invention in the barrel.

Fig. 7 is an internal cross-sectional view of the third embodiment of the present invention when running in the barrel.

Fig. 8 is an exploded view of the third embodiment of the present invention.

Figure 9 is an overall assembly diagram of the third embodiment of the present invention.

Figure 10 is an exploded view of the fourth embodiment of the present invention.

11 is a schematic diagram of the structure of the second ring body of the fourth embodiment of the present invention.

Figure 12 is an overall assembly diagram of the fourth embodiment of the present invention.

Detailed ways

The present invention will be further described in detail below with reference to the drawings and specific embodiments.

Example one

1 to 3, a screw non-return ring mechanism for an injection molding machine includes a non-return ring 1. A first opening 2 penetrates in the axial direction of the non-return ring 1, so that the stop can be realized through the first opening 2. The elastic deformation of the reverse ring 1 in the radial direction. (Figure 3 only shows the shape of multiple first openings 2 concentrated in the non-return ring 1, which is easy to compare, and is not a structural diagram of the actual non-return ring 1.) In this embodiment, the first opening 2 is a straight line Shape or arc shape or a combination of both. Considering the diversity of the shape of the first opening 2, it can be any of the above, of course, it can also be an irregular curve, but relatively speaking, the non-return ring 1 with the linear first opening 2 has better integrity. Longer life.

1, the structure and process of the non-return ring used in conjunction with other parts in the injection molding machine are: inside the barrel 3, the non-return ring 1 is set between the screw head 4 and the screw gasket 5, and the screw head is connected The rod 6 passes through the central through hole of the check ring 1, and the gap between the two is the conveying channel 7. When the injection molding machine enters the injection state, the screw 8 moves to the left in the figure, and the anti-return ring 1 slides to the left together after being supported by the screw 8 and the screw gasket 5. At this time, the pressure in the conveying channel 7 increases, and the non-return ring 1 is squeezed outward in the radial direction, and the non-return ring 1 is elastically deformed and the outer diameter is enlarged, which causes the ring cylinder gap 9 to become smaller, which improves the sealing effect and shortens the response. time. When the injection is completed, the non-return ring 1 shrinks under the action of its own rebound force as the pressure decreases, and the ring barrel gap 9 returns to its original shape. The non-return ring 1 slides to the right with the screw 8 and returns to its original position smoothly.

The non-return ring mechanism also includes an auxiliary ring 11. The non-return ring 1 includes a first ring body 12 and a second ring body 13, and the outer diameter of the first ring body 12 is larger than that of the second ring. Body 13, the auxiliary ring 11 is sleeved on the second ring body 13. Preferably, the outer diameter of the auxiliary ring 11 is the same as the outer diameter of the first ring body 12, and the height of the auxiliary ring 11 is the same as the height of the second ring body 13. Therefore, the overall shape and size of the non-return ring 1 and the auxiliary ring 11 after being combined are consistent with the overall shape and size of the original non-return ring. The auxiliary ring 11 can ensure the sealing problem of the non-return ring in the axial direction and prevent The possibility of leakage of raw materials.

4, specifically regarding the leakage problem of the non-return ring 1, because the non-return ring 1 includes a first ring body 12 and a second ring body 13, passing through the first opening 2 will appear along the first ring body 12 The first leakage passage 14a in the radial direction, the second leakage passage 14b along the axial direction of the first ring body 12, the third leakage passage 14c along the radial direction of the second ring body 13, and the first leakage passage along the axial direction of the second ring body 13. Four leakage passages 14d, the first leakage passage 14a is blocked by abutting against the inner circular wall of the barrel 3, the second leakage passage 14b and the third leakage passage 14c are blocked by the auxiliary ring 11, and the fourth leakage passage 14d is blocked by The end face of the screw gasket 5 is close to and blocked, but due to the different shapes and sizes of the screw gasket 5 of different injection molding machines, when the outer diameter of the screw gasket 5 is smaller than the outer diameter of the second ring body 13, the fourth There is a possibility of leakage in the leakage channel 14d, so this embodiment only addresses the case where the outer diameter of the screw gasket 5 is larger than the outer diameter of the second ring body 13, and the outer diameter of the screw gasket 5 is smaller than the outer diameter of the second ring body 13. The solution to the leakage is described in the second embodiment.

Since the non-return ring 1 is deformed, the auxiliary ring 11 must be deformed accordingly to prevent interference with the deformation of the non-return ring 1. Therefore, a second opening 15 penetrates the auxiliary ring 11 in the axial direction to ensure the second The leakage channel 14b is not leaked, so the second opening 15 must be staggered from the first opening 2, and it is best to stagger by 180°, and the shape of the first opening 2 and the second opening 15 in this embodiment can be the same as the implementation The first opening 2 in example one is the same, it is straight or arc-shaped or a combination of the two, of course, it can also be other irregular curves, but it must meet the requirements of staggered arrangement. Generally speaking, the opening is selected as a straight line The integrity of the shape structure is better, so that the non-return ring 1 and the auxiliary ring 11 can have a longer service life.

It should be noted that the non-return ring 1 and the auxiliary ring 11 must be quenched before the first opening 2 and the second opening 15 are processed by wire cutting or laser cutting, because the quenching process is performed first, and then the cutting is performed. The amount of deformation is smaller. And in order to prevent the material in the first opening 2 or the second opening 15 from affecting the quality of the product, under the premise of satisfying injection molding, the opening gap should be as small as possible. Therefore, the first opening 2 and the second opening 15 in each view In order to facilitate the observation, it has been enlarged. And in terms of material selection, in order to ensure that the non-return ring mechanism has sufficient fatigue resistance and wear resistance, stainless steel is selected as the material of the non-return ring 1 and the auxiliary ring 11. Of course, other similar materials with the above properties can also be selected. .

Refer to Figure 5, after the non-return ring 1 and the auxiliary ring 11 are set together, they need to be properly fixed. The fixing method can be welding (fixed by welding at a certain point, but not welded as a whole), card slot, and trace Surplus fit and so on. Welding is a better fixing method. The welding point 16 can be selected at the junction of the auxiliary ring 11 on the end surface of the anti-return ring 1 and the second ring body 13 of the anti-return ring 1. Because this is the sealing surface, the surface of the solder joints needs to be properly treated later to avoid leakage. Another welding method is to drill a welding hole 17 on the second ring body 13 of the non-return ring 1, and weld the non-return ring 1 and the auxiliary ring 11 through the welding hole 17 from the central channel of the non-return ring 1. Because this is not a sealing surface, the smoothness of the solder joints is lower. For the sake of simplicity, the welding point 16 and the welding hole 17 are marked together in FIG. 5, which does not mean that two places are to be welded.

The non-return ring 1 and the auxiliary ring 11 can be fixed or not fixed after being fitted together. If you want to fix it, you cannot use interference fit. The two must be a clearance fit. The inner diameter of the auxiliary ring 11 is slightly larger than the outer diameter of the second ring body 13 on the non-return ring 1, and the gap size is based on the auxiliary ring 11. The principle of preventing the non-return ring 1 from opening and deforming. At this time, because the auxiliary ring 11 cannot be expanded and deformed with the check ring 1, its outer diameter is preferably slightly larger than the outer diameter of the first ring body 12 of the check ring 1. If it is larger, please refer to the description in the next paragraph.

Because the non-return ring 1 of the present invention has the ability to expand and deform outwards under pressure, the gap 9 of the ring cylinder should be larger than that of the traditional machine, so that the non-return ring 1 can slide more smoothly during the working period of no sealing effect to reduce Wear. Taking a 200g injection molding machine as an example, the ring barrel gap 9 can be increased by about 0.06mm on the basis of the traditional size, that is, the outer diameter of the non-return ring 1 of the present invention is larger than that of the traditional non-return ring when the size of the barrel 3 remains unchanged. It is about 0.06mm smaller.

In this embodiment, the two end faces of the screw gasket 5 of the injection molding machine must be flat, and in order to prevent leakage of the second leakage channel 14b, the inner diameter of the second ring body 13 needs to be smaller than the outer diameter of the screw gasket 5 (not For the solution when this requirement is met, refer to the subsequent embodiment 2).

In addition, in this embodiment, the installation of the anti-reverse ring requires direction (Embodiment 1 and Embodiment 3 are also available, and have been indicated by arrows in each drawing), and the first ring body 12 must be located near the screw head The end of 4 must be consistent with the injection direction of the injection molding machine, otherwise it will affect the use effect.

And by changing the wall thickness or length of the first ring body 12 and the second ring body and the auxiliary ring 11 on the check ring 1, the effect of the check ring mechanism can be adjusted to meet different requirements of injection molding machines.

Example two

Referring to Fig. 6, in this embodiment, a sealing ring 10 is added between the non-return ring 1 and the screw gasket 5 on the basis of the first embodiment. The outer diameter of the sealing ring 10 is the same as the outer diameter of the auxiliary ring 11. The inner diameter of the sealing ring is the same as the inner diameter of the non-return ring 1, and one end surface of the sealing ring 10 is in contact with the non-return ring 1 and the auxiliary ring 11, so that the sealing ring 10 can realize the sealing of the second leakage passage 14b , And the other end face is close to the screw gasket 5, so no matter what shape and size the screw gasket 5 is, the sealing effect will not be affected.

Example three

Referring to Figures 7, 8 and 9, this embodiment considers that the amount of elastic deformation of the non-return ring 1 with a first opening 2 is limited through the second embodiment, so the expansion effect caused by the deformation is not good, so As a result, it cannot completely produce a gapless fit with the barrel, which affects the use of the injection molding machine. At the same time, because the check ring 1 and the seal ring 10 are separated, there is no fixed structure between the two, so under the action of the squeezing force, there will be a gap between the check ring 1 and the seal ring 10. The raw materials will still leak from the gap.

Therefore, the improvement made in this embodiment is: at least two first openings 2 axially penetrate through the anti-return ring 1, preferably four first openings 2, and at least two first openings 2 axially penetrate through the auxiliary ring 11 For the two openings 15, preferably four second openings 15 are selected, and the second openings 15 and the first openings 2 are arranged alternately. Through the first opening 2 and the second opening 15, the non-return ring 1 and the auxiliary ring 11 can produce a better outer bulging deformation effect when the injection molding machine is used, so as to achieve a close fit with the barrel 3 to ensure the injection effect and product quality. Of course, the number of the first opening 2 and the second opening 15 is not limited, it can also be two, three, five, etc. Relatively speaking, the more the number of openings, the better the deformation effect, and only need to be staggered It can be set without causing leakage of raw materials, but the more openings, the cost will definitely increase, and the specific optimization of the number of openings will be different for different injection molding machines and injection materials.

Of course, the shapes of the first opening 2 and the second opening 15 are not limited as in the first and second embodiments. They can be straight lines, arcs, curves and irregular shapes, as long as they can be deformed.

Considering that it is in the barrel 3, and the gap 9 between the check ring 1 and the auxiliary ring 11 and the barrel 3 is basically set at about 0.1mm when it is not working, if the first opening 2 has no support, set two After the first opening 2 above, the non-return ring 1 will be divided into multiple non-return ring segments by the multiple first openings 2 and split, so the multiple non-return ring segments are all connected to the sealing ring 10. Preferably, the first annular groove 18 of the inner ring of the second ring body 13 and the first annular protrusion 19 at the front end of the sealing ring 10 are matched to achieve mutual connection and fixation. Therefore, through the above-mentioned structural design, a very small ring cylinder gap 9 The fixing and deformation effect of the non-return ring 1 divided into multiple pieces by the first opening 2 can be ensured. At the same time, in order to prevent the second opening 15 from rotating and splitting, the inner ring of the auxiliary ring 11 is provided with a first positioning rib 20 in the axial direction, and the outer ring of the second ring body 13 is provided with a first arc groove 21 in the axial direction. The cooperation of a positioning rib 20 and the first circular arc groove 21 makes the one of the auxiliary ring 11 divided by the second opening 15 and the anti-return ring 1 fixed, which ensures the fixing and deformation of the auxiliary ring 11.

Before being put into the injection molding machine, because the setting of two or more first openings 2 and second openings 15 will cause the non-return ring 1 and the auxiliary ring 11 to break apart, it is not easy to assemble, so you can put it in the first opening 2 and the second opening 15 are reserved with a connection port of appropriate thickness to prevent the non-return ring 1 and the auxiliary ring 11 from being disconnected, which facilitates the assembly of the overall non-return ring mechanism. After being installed, the connection port will follow Of course, the first opening 2 and the second opening 15 can also be temporarily bonded at the first opening 2 and the second opening 15 by glue or other methods, and then placed in the injection molding machine. It cracked after work.

When designing the non-return ring mechanism, it is necessary to consider the leakage of materials in the opening and other gaps, because the leakage will directly affect the quality of the product. Therefore, in this embodiment, the problem of material leakage inside the check ring mechanism is first considered, and the first opening 2 and the second opening 15 are staggered, and the outer parts of the first ring body 12, the auxiliary ring 11 and the sealing ring 10 The diameter is the same. When the injection molding machine is working, the first ring body 12 and the auxiliary ring 11 bulge and deform so that the ring barrel gap 9 is completely sealed without the possibility of leakage, and the extruded raw material flows into the first opening 2 It will be blocked by the auxiliary ring 11, so there will be no leakage through the above design. Consider the case of material leakage due to the gap between the inside of the barrel and the check ring. The inner diameters of the second ring body 13 and the sealing ring 10 are set to be the same, and the inner diameters of the second ring body 13 and the sealing ring 10 are smaller than those of the injection molding machine. The outer diameter of the screw gasket 6 on the screw. As the screw 9 moves forward when the injection molding machine is working, the non-return ring mechanism slides forward together after being supported by the screw 9 and the screw gasket 6. At this time, the rightmost seal ring 10 is attached to the screw gasket 6 Through the above design, it is ensured that the sealing ring 10 and the screw gasket 6 will not generate a gap and cause leakage when they are matched, thereby ensuring the seal formed by the sealing ring 10 and the screw gasket 6 being attached to each other.

Example four

10, 11 and 12, considering that the screw head 5 will go back and rotate when resetting, the screw head 5 may be stuck on the first opening 2 to drive the anti-return ring mechanism to rotate together, and this In the non-working state, because the non-return ring 1 and the auxiliary ring 11 are in a free state without internal expansion and deformation, the horizontal injection molding machine will cause a slight drop due to gravity, so the screw head 5 drives the stop When the counter ring 1 and the auxiliary ring 11 rotate, the outer ring of the check ring 1 and the auxiliary ring 11 will rub against the inner wall of the barrel 3 to accelerate the wear of the inner wall of the barrel 3, the check ring 1 and the auxiliary ring 11, thereby greatly reducing the stop The service life and sealing effect of the reverse ring mechanism and the barrel 3.

Considering the above-mentioned problems, this embodiment separates the first ring body 12 and the second ring body 13 on the basis of the third embodiment, and connects them by a connecting structure, wherein the first opening 2 is provided on the second ring body 13 , And the first ring body 12 is not provided, so that the problem of the screw head 5 being stuck on the first ring body 12 when rotating will not occur. Preferably, the second annular groove 22 of the inner ring of the second ring body 13 and the second annular protrusion 23 at the rear end of the first ring body 12 are matched and fixed.

However, the first ring body 12 without the first opening 2 will cause a problem, that is, during the internal bulging deformation, because the first ring body 12 is not provided with the first opening 2, it will not be deformed, and it will not deform. The outer diameter of the first ring body 12 will be smaller than the outer diameter of the auxiliary ring 11, and at this time, the injection material may leak from the second opening 15 of the auxiliary ring 11.

In order to avoid this situation, the auxiliary ring 11 is divided into a first auxiliary ring segment 24 and a second auxiliary ring segment 25. The second opening 15 is divided to form a third opening 26 penetrating through the first auxiliary ring segment 24 and a penetrating The fourth opening 27, the third opening 26 and the fourth opening 27 on the second auxiliary ring segment 25 are staggered. With this arrangement, the injection material will be blocked with the second auxiliary ring segment 25 after entering the third opening 26, thereby avoiding the possibility of material leakage.

In this embodiment, the outer ring of the second ring body 13 is axially provided with a second positioning rib 28 and a third positioning rib 29, and the inner ring of the first auxiliary ring section 24 is provided with a second arc groove 30, The inner ring of the auxiliary ring segment 25 is provided with a third circular arc groove 31, the second positioning rib 28 is inserted into the second circular arc groove 30, and the third positioning rib 29 is inserted into the third circular arc groove 31. Therefore, the fixed connection of the first auxiliary ring segment 24 and the second auxiliary ring segment 25 on the non-return ring 1 is realized by the above arrangement.

In addition, in the second embodiment, the non-return ring 1 and the auxiliary ring 11 are divided into several parts, which is more convenient for replacement, so that when one of the parts is damaged, the entire large part does not need to be replaced, which is relatively more cost-effective.

The above embodiment is only one of the more preferred solutions of this patent, and any changes made without departing from the scope of this technical solution are within the scope of this patent.

Claims

A screw non-return ring mechanism for an injection molding machine, including a non-return ring, is characterized in that a first opening penetrates through the axial direction of the non-return ring, and also includes an auxiliary ring, and the non-return ring includes a first opening. A ring body and a second ring body, and the outer diameter of the first ring body is larger than the second ring body, the auxiliary ring is sleeved on the second ring body, and the auxiliary ring A second opening penetrates through the axial direction, and the second opening is staggered from the first opening.
The screw non-return ring mechanism for an injection molding machine according to claim 1, wherein the first opening is linear or arc-shaped or a combination of the two.
The screw check ring mechanism for injection molding machines according to claim 1, wherein the outer diameter of the auxiliary ring is the same as the outer diameter of the first ring body, and the thickness of the auxiliary ring is the same as that of the second ring. The height of the ring body is the same.
The screw non-return ring mechanism for an injection molding machine according to claim 1, wherein the second opening is linear or arc-shaped or a combination of the two.
The screw non-return ring mechanism for an injection molding machine according to claim 1, wherein the non-return ring mechanism further includes a sealing ring, and the sealing ring is located between the non-return ring and the screw of the injection molding machine. Between the screw spacers.
The screw non-return ring mechanism for an injection molding machine according to claim 5, wherein the outer diameter of the seal ring is the same as the outer diameter of the first ring body, and the inner diameter of the seal ring is the same as that of the non-return ring. The inner diameter of the ring is the same.
A screw non-return ring mechanism for an injection molding machine includes a non-return ring, an auxiliary ring and a sealing ring. The non-return ring includes a first ring body and a second ring body. The auxiliary ring is sleeved on the The second ring body is characterized in that at least two first openings penetrate axially through the non-return ring, at least two second openings penetrate axially through the auxiliary ring, and the second The openings are arranged alternately with the first openings, the non-return ring is divided into a plurality of non-return ring segments through the first opening, and the plurality of non-return ring segments are all connected with the sealing ring.
The screw non-return ring mechanism for an injection molding machine according to claim 7, wherein the inner ring of the second ring body is provided with a first annular groove, and the front end of the sealing ring is provided with a first annular protrusion , The first annular protrusion is clamped into the first annular groove.
The screw non-return ring mechanism for an injection molding machine according to claim 8, wherein the outer ring of the second ring body is axially provided with a first arc groove, and the inner ring of the auxiliary ring is axially provided with The first positioning rib is inserted into the first arc groove.
The screw non-return ring mechanism for an injection molding machine according to claim 8, wherein the first ring body and the second ring body are separately arranged, and the inner ring of the second ring body is provided with a second annular recess Groove, the rear end of the first ring body is provided with a second annular protrusion, and the second annular protrusion is clamped into the second annular groove.
The screw non-return ring mechanism for injection molding machines according to claim 10, wherein the auxiliary ring is radially divided to form a first auxiliary ring segment and a second auxiliary ring segment, and the second opening is divided into A third opening penetrating through the first auxiliary ring segment and a fourth opening penetrating through the second auxiliary ring segment are formed, and the third opening and the fourth opening are staggered.
The screw non-return ring mechanism for an injection molding machine according to claim 11, wherein the outer ring of the second ring body is axially provided with a second positioning rib and a third positioning rib, and the first auxiliary ring segment The inner ring is provided with a second arc groove, the inner ring of the second auxiliary ring segment is provided with a third arc groove, the second positioning rib is inserted into the second arc groove, the The third positioning rib is inserted into the third arc groove.
The screw non-return ring mechanism for an injection molding machine according to any one of claims 7 to 12, wherein the first opening and the second opening are both straight lines, arcs or curves.
The screw non-return ring mechanism for an injection molding machine according to any one of claims 7 to 12, wherein the outer diameters of the first ring body, the auxiliary ring and the sealing ring are the same, and the second ring The inner diameter of the body and the sealing ring are the same, and the inner diameter of the sealing ring is smaller than the outer diameter of the screw gasket on the screw for the injection molding machine.