CN211138015U - Improved screw check ring mechanism for injection molding machine - Google Patents

Abstract

The utility model provides an improved generation screw rod non-return ring mechanism for injection molding machine, includes non-return ring, auxiliary ring and sealing ring, non-return ring include first ring body and second ring body, auxiliary ring cover establish the second ring body on, non-return ring go up axial through and have two at least first openings, auxiliary ring go up axial through and have two at least second openings, the second opening with first opening staggered arrangement, non-return ring cut apart into a plurality of through first opening and prevent contrary ring section, a plurality of prevent contrary ring section all with the sealing ring be connected. The non-return ring and the auxiliary ring are provided with the plurality of openings which are arranged in a staggered mode, so that the injection molding machine can achieve a good deformation effect when in work, a good sealing effect is achieved, and finally the injection molding quality of the injection molding machine is improved. And the integrated design of the non-return ring, the auxiliary ring and the sealing ring can effectively prevent the possibility of material leakage in the working process from further influencing the quality of injection molding products.

Description

Improved screw check ring mechanism for injection molding machine

Technical Field

The invention relates to the field of injection molding machines, in particular to an improved screw check ring mechanism for an injection molding machine.

Background

The injection molding machine is an indispensable machine in injection molding, and is mainly used for manufacturing thermoplastic plastics or thermosetting plastics into plastic products with various shapes by using a plastic molding die. The screw check ring of the injection molding machine is one of important parts in the injection molding machine, and has the main function of realizing the sealing effect during injection of the injection molding machine, and the sealing effect can influence factors such as injection molding pressure and the like, so that the performance of one injection molding machine is determined by the quality of the sealing effect brought by the screw check ring of the plastic molding machine to a certain extent.

The check ring is generally sleeved on a screw rod for an injection molding machine, and can move back and forth along with the screw rod in a material cylinder in an axial direction during operation, an outer circular wall of the check ring is attached to an inner circular wall of the material cylinder, and a gap between the two circular walls (hereinafter, referred to as a circular cylinder gap) is sealed by the check ring.

In order to improve the injection molding properties, it is reasonable to say that the ring gap should be as small as possible. The deformation of the non-return ring and the charging barrel caused by the temperature influence has larger difference, and when different materials are used for producing different products, the required working temperature and pressure are different, and in addition, the influence caused by processing errors comprehensively causes that the clearance of the ring barrel can generate very large fluctuation in the actual use and is not well controlled. If the gap between the ring cylinders is made smaller, the gap may be smaller under the influence of the factors, so that the non-return ring cannot slide normally in the cylinder, the non-return ring and the non-return ring are worn at different degrees, the service life is greatly shortened, and the product quality is seriously influenced. If the annular cylinder gap is made larger, the annular cylinder gap can be made larger under the influence of the factors, so that the sealing performance cannot be guaranteed, the injection molding pressure is influenced, and the product quality is finally seriously influenced.

The present invention relates to a non-return ring for realizing sealing effect by its deformation, for example, a non-return ring of "201910469528.6" named as "screw non-return ring mechanism for injection molding machine, which realizes deformation sealing by passing an opening through the non-return ring, when in operation, the screw moves forward to extrude the material into the non-return ring and expand outward, so as to realize complete sealing between the non-return ring and the charging barrel, and when in charging, the screw rotates and moves backward, so that the raw material passes through the middle of the non-return ring and is fed into the filling area from the head of the screw, at this time, the non-return ring returns to original shape without extrusion force, and because the passing opening on the non-return ring can generate possibility of leakage, so as to ensure no leakage, an auxiliary ring is added on the non-return ring, the auxiliary ring is sleeved on the non-return ring, and the auxiliary ring is also provided with an opening, can cooperate the non-return ring to realize deformation simultaneously through this opening and seal to this opening is inconsistent with the opening on the non-return ring (prevents when unanimous raw and other materials from non-return ring and the opening gap on the auxiliary ring material that leaks), and simultaneously in order to prevent to leak the material and influence product quality from non-return ring inside at the during operation, a sealing ring has been increased, this sealing ring is located between non-return ring and the screw rod gasket, thereby make during operation screw rod move forward extrusion material to non-return ring inside, can not lead to outwards leaking the material from non-return ring inside because of the existence of sealing ring. However, the invention has the following disadvantages: 1) the opening on the non-return ring is only one, so the expansion effect generated by deformation is poor, and the non-clearance fit between the non-return ring and the charging barrel cannot be completely generated, and the use of the injection molding machine is influenced. 2) Because the non-return ring and the sealing ring are separated and have no fixed structure between the non-return ring and the sealing ring, a gap is generated between the non-return ring and the sealing ring under the action of extrusion force, and raw materials in the non-return ring can still leak out from the gap.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides an improved screw check ring mechanism for an injection molding machine.

The technical scheme for solving the technical problem is as follows: the utility model provides an improved generation screw rod non-return ring mechanism for injection molding machine, includes non-return ring, auxiliary ring and sealing ring, non-return ring include first ring body and second ring body, auxiliary ring cover establish the second ring body on, non-return ring go up axial through and have two at least first openings, auxiliary ring go up axial through and have two at least second openings, the second opening with first opening staggered arrangement, non-return ring cut apart into a plurality of through first opening and prevent contrary ring section, a plurality of prevent contrary ring section all with the sealing ring be connected.

Furthermore, 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.

Furthermore, 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 arc groove.

Further, first ring body and second ring body separation setting, the inner circle of second ring body is equipped with second annular groove, the rear end of first ring body is equipped with the second annular arch, the protruding card of second annular go into the second annular groove in.

Furthermore, the auxiliary ring is radially divided into a first auxiliary ring segment and a second auxiliary ring segment, 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, and the third opening and the fourth opening are arranged in a staggered mode.

Furthermore, a second positioning rib and a third positioning rib are axially arranged on the outer ring of the second ring body, a second arc groove is formed in the inner ring of the first auxiliary ring section, a third arc groove is formed in the inner ring of the second auxiliary ring section, the second positioning rib is inserted into the second arc groove, and the third positioning rib is inserted into the third arc groove.

Further, the first opening and the second opening are both one of a straight line, an arc or a curve.

Further, the first ring body, the auxiliary ring and the sealing ring are arranged in the same outer diameter mode, the second ring body is the same as the sealing ring in inner diameter, and the inner diameter of the sealing ring is smaller than the outer diameter of a screw rod gasket on a screw rod for an injection molding machine.

The invention has the beneficial effects that: 1. the non-return ring and the auxiliary ring are provided with the plurality of openings which are arranged in a staggered mode, so that the injection molding machine can achieve a good deformation effect when in work, the outer ring of the non-return ring is completely attached to the inner ring of the charging barrel when in deformation, a good sealing effect is achieved, and finally the injection molding quality of the injection molding machine is improved. 2. The integrated design of the check ring, the auxiliary ring and the sealing ring can effectively prevent the possibility of material leakage of raw materials in the working process from further influencing the quality of injection molding products.

Drawings

Fig. 1 is an internal structural view of an injection molding machine of the present invention.

Fig. 2 is an exploded view of a first embodiment of the present invention.

Fig. 3 is an assembly diagram of a first embodiment of the present invention.

Fig. 4 is an exploded view of a second embodiment of the present invention.

Fig. 5 is a structural view of a second ring body of the second embodiment of the present invention.

Fig. 6 is an assembly view of a second embodiment of the present invention.

Detailed Description

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

Referring to fig. 1, the working principle of the specific check ring mechanism in the injection molding machine is as follows: a non-return ring mechanism (comprising a non-return ring 1, an auxiliary ring 2 and a sealing ring 3) is arranged between a screw head 5 and a screw gasket 6 in a charging barrel 4, a screw head connecting rod 7 penetrates through a central through hole of the non-return ring 1, and a gap between the screw head connecting rod 7 and the non-return ring 1 is a material conveying channel 8. When the injection molding machine enters an injection state, the screw 9 moves in the left direction in the figure, the check ring mechanism slides forwards together after being propped by the screw 9 and the screw gasket 6, the sealing ring 3 on the rightmost side is attached to the screw gasket 6 to form sealing, and meanwhile, the screw 9 and the check ring mechanism continuously increase the pressure in the material conveying channel 8 in the forward movement process, so that the injection molding raw material at the front end of the check ring 1 in the material barrel 2 is extruded into the material conveying channel 8, finally, the check ring 1 and the auxiliary ring 2 are extruded outwards along the radial direction, and the check ring 1 and the auxiliary ring 2 are elastically deformed and expanded in outer diameter, so that the annular barrel gap 10 is completely sealed, the sealing effect is ensured, and the response time is shortened. When the injection is finished, the non-return ring 1 and the auxiliary ring 2 shrink and reset along with the reduction of pressure, the ring cylinder gap 10 is restored to the original state, and the whole non-return ring mechanism smoothly slides rightwards along with the screw 8 to return to the original position.

Example one

Referring to fig. 2 and 3, an improved screw check ring mechanism for an injection molding machine includes a check ring 1, an auxiliary ring 2 and a sealing ring 3, where the check ring 1 includes a first ring body 11 and a second ring body 12, and the first ring body 11 and the second ring body 12 in this embodiment are integrally formed, the auxiliary ring 2 is sleeved on the second ring body 12, four first openings 13 axially penetrate through the check ring 1, four second openings 14 axially penetrate through the auxiliary ring 2, and the second openings 14 and the first openings 13 are arranged in a staggered manner. Through the first opening 13 and the second opening 14, the non-return ring 1 and the auxiliary ring 2 can generate outward expansion deformation when the injection molding machine is used, so that the non-return ring and the auxiliary ring are tightly matched with the charging barrel 10, and the injection molding effect and the product quality are ensured. The number of the first openings 13 and the second openings 14 is not limited, and may be two, three, five, etc., and the larger the number of the openings is, the better the deformation effect is, but the cost is increased, and the effect of using the specifically optimized number of the openings is different for different injection molding machines and injection molding materials.

Of course, the shapes of the first opening 13 and the second opening 14 are not limited, and may be straight lines, circular arcs, curved lines, and irregular shapes, and only need to be deformable.

Considering that the inner space of the barrel 4 and the gap 10 between the non-return ring 1 and the auxiliary ring 2 and the barrel 4 are set to be about 0.1mm when not in operation, if the first opening 13 has no support, after two or more first openings 13 are set, the non-return ring 1 is divided into a plurality of non-return ring segments by the plurality of first openings 13 and the non-return ring segments are split, so that the plurality of non-return ring segments are all connected with the sealing ring 3, preferably, the non-return ring segments are connected and fixed with each other by the cooperation of the first annular groove 15 of the inner ring of the second ring 12 and the first annular protrusion 16 of the front end of the sealing ring, and therefore, by the above-mentioned structural design, the fixing and deformation effects of the non-return ring 1 divided into a plurality of blocks by the first openings 13 can be ensured by the very small. Meanwhile, in order to prevent the second opening 14 from rotating and cracking, a first positioning rib 17 is axially arranged on the inner ring of the auxiliary ring 2, a first arc groove 18 is axially arranged on the outer ring of the second ring body 12, and through the matching of the first positioning rib 17 and the first arc groove 18, one of the auxiliary ring 2 divided by the second opening 14 is fixed with the non-return ring 1, so that the fixing and deformation effects of the auxiliary ring 2 are guaranteed.

Before the non-return ring mechanism is placed into an injection molding machine, because two or more first openings 13 and two or more second openings 14 are arranged to break the non-return ring 1 and the auxiliary ring 2, so that the non-return ring mechanism is not easy to assemble, connecting ports with proper thickness can be reserved on the first openings 13 and the second openings 14 before the non-return ring mechanism is placed into the injection molding machine, the non-return ring 1 and the auxiliary ring 2 are prevented from being broken, the whole non-return ring mechanism is convenient to assemble, the connecting ports can be broken along with the inner expansion deformation movement after the non-return ring mechanism is placed into the injection molding machine, and the first openings 13 and the second openings 14 which completely penetrate through the connecting ports can be formed, and the openings can be adhered temporarily through glue or other methods at the first openings 13 and the second openings 14, and.

When the non-return ring mechanism is designed, the conditions of material leakage of openings and material leakage of other gaps must be considered, and the quality of products is directly and seriously influenced due to the material leakage. Therefore, in the embodiment, the material leakage problem inside the check ring mechanism is considered firstly, the first opening 13 and the second opening 14 are arranged in a staggered manner, and the outer diameters of the first ring body 12, the auxiliary ring 2 and the sealing ring 3 are the same, so that when the injection molding machine works, the first ring body 12 and the auxiliary ring 2 are expanded and deformed to completely seal the ring cylinder gap 10 without leakage, and extruded raw materials flow into the first opening 13 and are blocked by the auxiliary ring 2, so that leakage cannot be generated through the design. Considering the leakage of the material due to the clearance between the inner part of the charging barrel and the non-return ring, the inner diameters of the second ring body 12 and the sealing ring 3 are set to be the same, and the inner diameters of the second ring body 12 and the sealing ring 3 are smaller than the outer diameter of the screw gasket 6 on the screw for the injection molding machine. Because at the injection molding machine during operation, screw rod 9 forward motion, the non-return ring mechanism is slided forward together after being withstood by screw rod 9 and screw rod gasket 6, and sealing ring 3 and screw rod gasket 6 on the rightmost side are laminated mutually this moment, and guaranteed through above-mentioned design that sealing ring 3 and screw rod gasket 6 can not produce the clearance and lead to leaking when the cooperation to guaranteed that sealing ring 3 and screw rod gasket 6 laminate mutually and formed sealed.

Example two

Referring to fig. 4, 5 and 6, considering that the screw head 5 rotates back when being reset, the screw head 5 may be clamped to the first opening 13 to drive the check ring mechanism to rotate together, and is in an inoperative state at this time, when the screw head 5 is in the inoperative state, because the check ring 1 and the auxiliary ring 2 are in a free state and do not have internal expansion deformation, a slight drop may be generated in the horizontal injection molding machine due to the influence of gravity, and when the screw head 5 drives the check ring 1 and the auxiliary ring 2 to rotate, the outer rings of the check ring 1 and the auxiliary ring 2 may generate friction with the inner wall of the material barrel 4 to accelerate the abrasion of the inner wall of the material barrel 4 and the check ring 1 and the auxiliary ring 2, thereby greatly reducing the service life and the sealing effect of the check ring mechanism and the material barrel 4.

In view of the above problem, the present embodiment is based on the first embodiment, wherein the first ring body 11 and the second ring body 12 are separately arranged and connected through the connection structure, and the first opening 13 is arranged on the second ring body 12, but not arranged on the first ring body 11, so that the problem that the screw head 5 is stuck on the first ring body 11 when rotating does not occur. Preferably, the second annular groove 19 of the inner ring of the second ring body 12 is matched and fixed with the second annular bulge 20 of the rear end of the first ring body 11.

However, the first ring body 11 is not provided with the first opening 13, so that a problem can be caused, that is, when the first ring body 11 is subjected to internal expansion deformation, the first ring body 11 is not provided with the first opening 13, so that the first ring body is not deformed, and the outer diameter of the first ring body 11 is smaller than that of the auxiliary ring 2, and at the moment, the injection molding material can leak from the second opening 14 of the auxiliary ring 2.

In order to avoid this, in the present embodiment, the auxiliary ring 2 is divided into the first auxiliary ring segment 21 and the second auxiliary ring segment 22 based on the first embodiment, the second opening 14 is divided into a third opening 23 penetrating through the first auxiliary ring segment 21 and a fourth opening 24 penetrating through the second auxiliary ring segment 22, and the third opening 23 and the fourth opening 24 are alternately arranged. With such a configuration, the injection molding material is blocked with the second sub ring segment 22 after entering the third opening 23, thereby avoiding the possibility of material leakage.

In this embodiment, the outer ring of the second ring body 12 is axially provided with a second positioning rib 25 and a third positioning rib 26, the inner ring of the first auxiliary ring segment 21 is provided with a second arc groove 27, the inner ring of the second auxiliary ring segment 22 is provided with a third arc groove 28, the second positioning rib 25 is inserted into the second arc groove 27, and the third positioning rib 26 is inserted into the third arc groove 28. The fixed connection of the first and second auxiliary ring segments 21, 22 to the non-return ring 1 is thus obtained by the above-mentioned arrangement.

In addition, the second embodiment divides the non-return ring 1 and the auxiliary ring 2 into a plurality of parts, so that the replacement is more convenient, when one part is damaged, the whole large part is not needed to be replaced, and the cost is relatively saved.

This embodiment is only one of the preferable embodiments of this patent, and any changes made without departing from the scope of this patent are within the scope of this patent.

Claims (8)

1. The utility model provides an improved generation screw rod check ring mechanism for injection molding machine, includes check ring, auxiliary ring and sealing ring, check ring include first ring body and second ring body, auxiliary ring cover establish the second ring body on its characterized in that: at least two first openings axially penetrate through the non-return ring, at least two second openings axially penetrate through the auxiliary ring, the second openings and the first openings are arranged in a staggered mode, the non-return ring is divided into a plurality of non-return ring sections through the first openings, and the non-return ring sections are connected with the sealing ring.

2. The improved screw check ring mechanism for injection molding machine of claim 1, wherein: 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 bulge, and the first annular bulge is clamped into the first annular groove.

3. The improved screw check ring mechanism for injection molding machine of claim 2, wherein: 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 arc groove.

4. The improved screw check ring mechanism for injection molding machine of claim 2, wherein: first ring body and second ring body separation setting, the inner circle of second ring body is equipped with second annular groove, the rear end of first ring body is equipped with the second annular arch, the protruding card of second annular go into the second annular groove in.

5. The improved screw check ring mechanism for injection molding machine of claim 4, wherein: the auxiliary ring is radially divided to form a first auxiliary ring segment and a second auxiliary ring segment, the second opening is divided to form a third opening penetrating through the first auxiliary ring segment and a fourth opening penetrating through the second auxiliary ring segment, and the third opening and the fourth opening are arranged in a staggered mode.

6. The improved screw check ring mechanism for injection molding machine of claim 5, wherein: 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, 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, and the third positioning rib is inserted into the third arc groove.

7. The improved screw check ring mechanism for injection molding machines of any one of claims 1 to 6, wherein: the first opening and the second opening are both one of a straight line, an arc or a curve.

8. The improved screw check ring mechanism for injection molding machines of any one of claims 1 to 6, wherein: 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 is the same as that of the sealing ring, and the inner diameter of the sealing ring is smaller than that of a screw gasket on a screw for an injection molding machine.

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