CN117549490B - Integral pressure-maintaining injection nozzle of injection molding machine - Google Patents
Integral pressure-maintaining injection nozzle of injection molding machine Download PDFInfo
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- CN117549490B CN117549490B CN202311825502.3A CN202311825502A CN117549490B CN 117549490 B CN117549490 B CN 117549490B CN 202311825502 A CN202311825502 A CN 202311825502A CN 117549490 B CN117549490 B CN 117549490B
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- 238000001746 injection moulding Methods 0.000 title claims abstract description 40
- 238000002347 injection Methods 0.000 title abstract description 43
- 239000007924 injection Substances 0.000 title abstract description 43
- 239000003292 glue Substances 0.000 claims abstract description 23
- 238000005520 cutting process Methods 0.000 claims description 30
- 229910001182 Mo alloy Inorganic materials 0.000 claims description 4
- VNTLIPZTSJSULJ-UHFFFAOYSA-N chromium molybdenum Chemical compound [Cr].[Mo] VNTLIPZTSJSULJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000011527 polyurethane coating Substances 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 abstract description 5
- 239000002994 raw material Substances 0.000 description 76
- 239000004033 plastic Substances 0.000 description 18
- 229920003023 plastic Polymers 0.000 description 18
- 239000000463 material Substances 0.000 description 16
- 238000001125 extrusion Methods 0.000 description 10
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 9
- 235000017491 Bambusa tulda Nutrition 0.000 description 9
- 241001330002 Bambuseae Species 0.000 description 9
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 9
- 239000011425 bamboo Substances 0.000 description 9
- 230000009471 action Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000009434 installation Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 230000001771 impaired effect Effects 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 210000003141 lower extremity Anatomy 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Abstract
The invention relates to an integrated pressure-maintaining injection nozzle of an injection molding machine, which belongs to the technical field of injection molding machine nozzles and comprises a nozzle cylinder, wherein the nozzle cylinder is arranged in a penetrating way along the axial direction at two ends, one end of the inner wall of the nozzle cylinder is provided with a sliding head in a sliding way, one end of the sliding head is provided with a glue injection port, one end of the inner wall of the nozzle cylinder far away from the sliding head is provided with a bearing tube, the bearing tube protrudes towards the axis of the nozzle cylinder to form a neck, one end of the neck, which is close to the sliding head, is provided with a sphere, the radial dimension of the neck is smaller than the diameter of the sphere, one side, which is far away from the neck, of the sphere is provided with a valve cover, the valve cover is provided with a plurality of flow passages in a penetrating way along the axial direction of the nozzle cylinder, and the radial dimension of any flow passage is smaller than the diameter of the sphere; the mold cavity can automatically fill the residual space in the mold cavity while preventing backflow.
Description
Technical Field
The invention belongs to the technical field of injection molding machine nozzles, and particularly relates to an integrated pressure-maintaining injection nozzle of an injection molding machine.
Background
The injection molding machine is a device for producing plastic products, which sprays melted plastic into a molding die through a glue injection mechanism for cooling molding, can be used for manufacturing various special-shaped plastic products, and has wide application in industrial manufacturing.
In a general working process of an injection molding machine, raw materials need to be added into the injection molding machine firstly, then a material melting component of the injection molding machine melts the raw materials, the melted raw materials enter a material pipe, the material pipe stretches into a cavity of the injection molding machine, the raw materials enter the cavity through the material pipe and a nozzle, because the shape of the cavity is complex, the higher injection pressure which is larger than the pressure of the raw materials in the cavity needs to be maintained to ensure that the raw materials fill up the space in the cavity, after the raw materials are filled up, the material pipe stops pressing, the material pipe retreats, the plastic in the cavity is cooled and molded, however, after the material melting component stops pressing, the raw materials in the material pipe and the nozzle do not maintain higher pressure under the action of the raw materials at the back, and because the shape of the cavity is unchanged all the time, the pressure in the cavity is larger than the pressure of the raw materials in the nozzle, and the backflow is possibly caused, therefore, the general scheme is that a one-way valve structure which is opened towards the outlet of the nozzle is arranged at the position of the nozzle, for example, a zero-pressure-maintaining anti-leakage plastic nozzle disclosed in China patent CN102476426B comprises a nozzle which is arranged at the front end outside the nozzle, a plastic body, a plastic channel is arranged in the body along the axial direction, and a plastic glue backflow channel is arranged in the plastic channel, and the plastic channel is prevented from being provided with a first valve core section corresponding to the first valve core section with the shape; the first valve core is a cake-shaped body penetrating along the axial middle part and comprises a first side surface and a second side surface, wherein the first side surface and the second side surface are sequentially arranged along the axial direction, the second side surface is opposite to the first side surface, and a slot for the plastic liquid to flow forwards is formed in the second side surface; the plastic injection cavity is provided with a first valve core, when the pressure at the rear end of the plastic channel disappears after injection is completed, and plastic liquid in the injection cavity flows back to the plastic channel, the first valve core moves backwards under the pressure action of the backflow plastic liquid to be completely attached to the first inner wall, so that a backflow path is blocked; in the actual injection molding process, the injection of the injection molding machine is needed to reserve allowance, the injection is usually stopped after about 98% of the injection is injected, the injection table is retracted, the residual raw materials in the injection nozzle need to flow into the cavity again after the screw stops rotating, and the functions cannot be completed in the structure.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an integrated pressure-maintaining injection nozzle of an injection molding machine, which has the characteristics of preventing backflow and simultaneously automatically filling the residual space.
The aim of the invention can be achieved by the following technical scheme:
The utility model provides an injection molding machine's integral type pressurize is penetrated mouth, includes the nozzle section of thick bamboo, the nozzle section of thick bamboo link up along axial both ends and is set up, nozzle section of thick bamboo inner wall one end slip is provided with the sliding head, sliding head one end is provided with penetrates the gluey mouth, nozzle section of thick bamboo inner wall is kept away from sliding head one end and is provided with the bearing pipe, the bearing pipe is protruding to nozzle section of thick bamboo axle center to be formed with the neck, the neck is close to sliding head one end and is provided with the spheroid, the radial dimension of neck is less than the spheroid diameter, and neck one side is kept away from to the spheroid is provided with the valve gap, the valve gap is provided with a plurality of runners along nozzle section of thick bamboo axial link up, any the radial dimension of runner is less than the spheroid diameter.
As a preferable technical scheme of the invention, one side of the neck part, which is close to the sliding head, is provided with a supporting cone, one side of the supporting cone, which is close to the sliding head, is provided with a supporting wall, the supporting cone is in a truncated cone shape, the supporting wall is in a cylindrical shape, the axes of the supporting cone and the supporting wall are coincident with the axis of the nozzle cylinder, and the supporting cone and the supporting wall are used for supporting the sphere in a matched manner.
As a preferable technical scheme of the invention, the side wall of the sliding head is provided with a cutting ring near the top end of one side of the nozzle cylinder, the cutting ring comprises a bottom surface, a side surface and an inclined surface, the radial extending direction of the inclined surface faces the axis of the sliding head, the cutting ring is connected with the sliding head through the bottom surface, the side surface is parallel to the side surface of the sliding head, and the side surface and the inclined surface are provided with cutting edges.
As a preferable technical scheme of the invention, the ratio of the radial dimension of the neck part to the diameter of the sphere is 0.90-0.91.
As a preferred embodiment of the present invention, the support tube is detachably connected to the nozzle cartridge.
As a preferred embodiment of the present invention, the sphere is made of a chromium molybdenum alloy.
As a preferable technical scheme of the invention, the outer wall of the sliding head is provided with a limiting table.
As a preferable technical scheme of the invention, the surface of the sphere is provided with a polyurethane coating.
The beneficial effects of the invention are as follows:
(1) The sliding head is arranged on one side of the nozzle cylinder in a sliding way, and is matched with the one-way valve structure formed by the ball body arranged on one side of the nozzle cylinder far away from the sliding head, so that after injection molding is stopped, raw materials in the cavity are extruded into the nozzle cylinder by the sliding head, and when the raw materials in the cavity are extruded by the sliding head, the raw materials in the cavity of the nozzle flow into the cavity from the glue injection port facing the cavity under the action of the flowing trend, so that the reserved 1-2% of cavity space and the residual space formed by the vacant space reserved by the back of the injection nozzle are filled, and the automatic filling of the residual space is realized while backflow is prevented;
(2) The cutting ring is arranged at the top end of one side of the side wall of the sliding head, which is close to the nozzle cylinder, so that the sliding head can move inwards for a longer distance under the condition that the pressure difference of two sides of the sliding head along the axial direction of the sliding head is equal, and more raw materials are ensured to flow from the glue injection port to the cavity to fill the residual space; meanwhile, the side edge of the cutting ring is set to be cylindrical with the diameter equal to that of the inner wall of the nozzle cylinder, so that broken raw materials are prevented from leaking out of the nozzle along a gap between the cutting ring and the nozzle cylinder, tightness is ensured, and meanwhile, the realization of automatically filling the residual space is further ensured;
(3) By setting the ratio of the radial dimension of the neck to the sphere diameter to be 0.90-0.91, the injection efficiency is considered, and the realization of automatic filling of the residual space is better ensured.
Drawings
The present invention is further described below with reference to the accompanying drawings for the convenience of understanding by those skilled in the art.
FIG.1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic view of the nozzle portion of the present invention;
FIG. 3 is a schematic cross-sectional view of a nozzle portion of the present invention;
FIG. 4 is a schematic view of another angular cross-sectional structure of the nozzle portion of the present invention
FIG. 5 is a schematic view of the structure of a slider portion of the present invention;
Description of main reference numerals:
in the figure: 1. a nozzle; 11. a nozzle cartridge; 111. a nozzle chamber; 12. a slider; 121. a glue injection port; 122. cutting the ring; 13. a supporting pipe; 131. a neck; 14. a valve cover; 141. a flow passage; 15. a sphere; 2. a charging barrel; 3. a cavity.
Detailed Description
In order to further describe the technical means and effects adopted by the invention for achieving the preset aim, the following detailed description is given below of the specific implementation, structure, characteristics and effects according to the invention with reference to the attached drawings and the preferred embodiment.
Referring to fig. 1-5, an integral pressure-maintaining nozzle of an injection molding machine includes a nozzle barrel 11, in this embodiment, the nozzle barrel 11 is integrally cylindrical, the cylindrical nozzle barrel 11 is penetrated along its own axis, the penetrated portion forms a cavity and an inner wall, one end of the inner wall of the nozzle barrel 11 is provided with a sliding head 12, the outer diameter of the sliding head 12 is equal to the inner diameter of the nozzle barrel 11, the sliding head 12 is penetrated and hollowed along its own axis, one side of the sliding head 12 is provided with a glue injecting port 121, the hollowed cavity inside the sliding head 12 and the cavity of the nozzle barrel 11 jointly form a nozzle cavity 111, specifically, the sliding head 12 is also cylindrical, one side of the cylindrical sliding head 12 far from the nozzle cavity 111 is convergent to form a conical structure, the center of the conical structure is provided with the glue injecting port 121, when in use, one side of the nozzle barrel 11 far from the sliding head 12 is installed at the head of the injection molding machine feed barrel 2, under the pushing of the glue injection assembly, the feed cylinder 2 enables the glue injection nozzle 1 to approach and enter the cavity 3, the screw in the feed cylinder 2 rotates, the pressure of molten raw material to the glue injection nozzle 1 is given, part of molten raw material is pushed to enter the nozzle cylinder 11, the molten raw material pushes the front raw material to enter the cavity 3 through the nozzle cavity 111 and the glue injection port 121 under the action of the pressure, meanwhile, the outer diameter of the sliding head 12 is larger than the outer diameter of an opening of the cavity 3, the side, close to the glue injection port 121, of the outer surface of the sliding head 12 is gradually converged to the glue injection port 121 to form a conical-like tip, when the molten raw material pushes the sliding head 12 to enable the sliding head 12 to have a trend of sliding out of the nozzle cylinder 11, the conical tip of the sliding head 12 is abutted with the opening of the cavity 3 to avoid sliding out, after the molten raw material is injected, part of raw material is filled into a part of the cavity 3 in the injection molding process, the sliding head forms external pressure by itself, at the moment, the screw continuously rotates, the pressure of the rear raw material is larger than that of the raw material in the cavity 3, and the raw material can continuously enter the cavity 3 with larger pressure;
In the injection molding process of the structure, since the screw is required to stop the feeding after the raw materials are filled, the raw materials in the nozzle 1 are not subjected to pressure from the screw and the subsequent raw materials, the pressure on the cavity 3 is reduced, and the raw material pressure in the cavity 3 is maintained at the original higher level because the volume of the cavity 3 is unchanged, the raw materials in the cavity 3 are pushed to flow back in the nozzle cavity 111, the inner wall of the nozzle barrel 11 is provided with the bearing tube 13 at one end far away from the sliding head 12, the bearing tube 13 protrudes towards the axis of the nozzle barrel 11 to form the neck 131, one end of the neck 131 close to the sliding head 12 is provided with the ball 15, the radial dimension of the neck 131 is smaller than the diameter of the ball 15, meanwhile, one side of the ball 15 far away from the neck 131 is provided with the valve cover 14, the valve cover 14 is axially penetrated by the nozzle barrel 11 and provided with a plurality of flow passages 141, and the radial dimension of any flow passage 141 is smaller than the diameter of the ball 15;
Specifically, the bearing tube 13 is integrally cylindrical, the neck 131 is formed by extending inwards from the inner wall of the cylindrical bearing tube 13, the cross-section size of the neck 131 is firstly reduced along the axial direction of the bearing tube 13 and then is larger, each radial cross section of the neck 131 is circular, the diameter of the smallest radial cross section area of the neck 131 is smaller than that of the sphere 15, conical converging mouth inner walls are formed on two sides of the neck 131, five flow passages 141 are arranged on the valve cover 14, each flow passage 141 is a cylindrical passage, the valve cover 14 is also cylindrical, the axes of the five flow passages 141 are parallel to the axis of the valve cover 14, the axis of the flow passage 141 at the center is coincident with the axis of the valve cover 14, and the other four flow passages 141 are arrayed in a cross shape around the central flow passage 141;
during injection molding, the raw materials push the sphere 15 forward under the pressure of the screw and the subsequent raw materials until the sphere 15 is no longer in contact with the neck 131; at this time, the molten raw material flows through the sphere 15 from the gap between the sphere 15 and the inner wall of the neck 131, the sphere 15 is continuously pushed until contacting with the valve cover 14, because the surface of the sphere 15 is a sphere, the bottom surface of the valve cover 14 close to the sphere 15 is a plane, so that a gap is left between the sphere 15 and the bottom surface of the valve cover 14, the molten raw material flows from the gap to the bottom surface of the valve cover 14, flows from the runner 141 communicating the two bottom surfaces of the valve cover 14 to the other end of the valve cover 14, enters the nozzle cavity 111 and finally enters the cavity 3 through the glue injection port 121, and injection molding is completed;
When the pressure is stopped, the raw material in the nozzle cavity 111 presses the sphere 15 in the direction away from the glue injection port 121 until the sphere 15 contacts with the inner wall of the conical converging port on the side of the neck 131, which is close to the sphere 15, and the radial section of the inner wall of the conical converging port is circular because the sphere 15 is spherical, so that the sphere 15 can be attached to the conical converging port on the side of the neck 131 to complete the blocking, and the occurrence of the backflow is prevented.
In actual injection molding, as the injection of the injection molding machine needs to reserve allowance, the injection is usually stopped after 98-99% of injection is injected and the injection platform is retracted, after the screw is stopped rotating, the residual raw material in the injection nozzle 1 flows into the cavity 3 again, the reserved 1-2% of cavity 3 space and the residual space formed by the vacant space reserved by the retraction of the injection nozzle 1 are filled, the functions cannot be completed in the structure, the injection molding effect is poor, the automatic filling of the residual space is realized while backflow is prevented, the sliding head 12 is slidably arranged at one end of the nozzle barrel 11, and the sliding head 12 has the freedom degree of axially sliding along the self and attached to the inner wall of the nozzle barrel 11;
When injection molding is completed, the screw and the subsequent materials far away from the pressure stopping to be applied to the materials in the nozzle cavity 111, firstly, the materials in the nozzle cavity 111 extrude the sphere 15 until the sphere 15 seals the backflow channel under the action of the pressure of the materials in the cavity 3, at this time, the nozzle cavity 111 forms a space which only faces the opening of the cavity 3, then, the pressure in the cavity 3 is still larger than the pressure in the nozzle cavity 111, so the materials in the cavity 3 extrude the sliding head 12 which stretches into the cavity 3 to one side of the feed cylinder 2 under the action of the self pressure, at this time, one end of the sliding head 12 is the materials in the cavity 3 with larger pressure, the other end is the materials in the nozzle cavity 111 with smaller pressure, and because the sliding head 12 can slide along the self axial direction, the sliding head 12 moves into the nozzle cylinder 11 under the extrusion of the materials in the cavity 3, so that the volume of the nozzle cavity 111 formed by the nozzle cylinder 11 and the sliding head 12 is reduced, since the molten raw material is a liquid substance with a smaller compressible degree, when the volume of the nozzle cavity 111 is reduced, the raw material has a tendency to flow out from the nozzle cavity 111, and since the raw material pressure in the nozzle cavity 111 is smaller than the raw material pressure in the cavity 3 in a short time, the raw material in the cavity 3 continuously extrudes the raw material in the nozzle cavity 111 to enable the ball 15 to seal the nozzle cavity 111, the nozzle cavity 111 continuously forms a space which only faces the opening of the cavity 3, therefore, after injection is stopped, the raw material extrusion sliding head 12 in the cavity 3 moves into the nozzle cylinder 11, when the raw material extrusion sliding head 12 in the cavity 3 is extruded, the raw material in the nozzle cavity 111 flows into the cavity 3 from the glue injection port 121 facing the cavity 3 under the action of the flowing-out tendency, fills the reserved 1-2% of the cavity 3 space and the rest space formed by the empty space reserved by the back of the nozzle 1, realizing automatic filling of the residual space;
Through the sliding of one side of nozzle section of thick bamboo 11 sets up slider 12, the check valve structure of being constituted by spheroid 15 that is set up in cooperation nozzle section of thick bamboo 11 side of keeping away from slider 12, can stop the back of moulding plastics, raw materials extrusion slider 12 in the die cavity 3 moves in to nozzle section of thick bamboo 11, when raw materials extrusion slider 12 in the die cavity 3, raw materials flows into in the die cavity 3 from the penetrating the gluey mouth 121 of die cavity 3 under the trend effect of outflow in the die cavity 111, fill the cavity 3 space of reserving 1 ~ 2%, and because the surplus space of the empty space constitution of penetrating the fallback of mouth 1, accomplish and realize automatic filling surplus space when preventing the backward flow.
In the process that the sliding head 12 moves into the nozzle barrel 11 under the extrusion of raw materials in the cavity 3, although a pressure difference is formed at two ends along the axial direction of the sliding head 12 and the sliding head can drive the sliding head to move inwards, the raw materials in the nozzle cavity 111 still can cause a certain obstruction to the inward movement process of the sliding head, the sliding head can not move inwards enough distance, enough space of the nozzle cavity 111 can not be compressed, enough raw materials can not be extruded from the nozzle cavity 111, and further the automatic filling of the residual space can not be realized, in order to avoid the occurrence of the situation, the side wall of the sliding head 12 is provided with a cutting ring 122 close to the top end of one side of the nozzle barrel 11, specifically, the cutting ring 122 comprises a bottom surface, a side surface and an inclined surface, the radial extending direction of the inclined surface faces the axis of the sliding head 12, the cutting ring 122 is connected with the sliding head 12 through the bottom surface, the side surface is parallel to the side surface of the sliding head 12, and the side surface and the inclined surface forms a cutting edge;
The axial cross section of cutting ring 122 is right triangle, right triangle's an limit comprises the bottom surface, the bottom surface is the annular that is equal with the upper surface shape of barrel slide head 12 side near spheroid 15, the side is cylindric, the diameter of cylindric side equals with the diameter of slide head 12 outer wall, the cutting ring 122 passes through the bottom surface and installs the upper surface of barrel slide head 12 side near spheroid 15, side and slide head 12 surface constitute smooth new cylindric this moment, ensure that the outer lane of cutting ring 122 can be laminated with nozzle cylinder 11 inner wall, be provided with the inclined plane between side and the bottom surface simultaneously, the inclined plane is the truncated cone, the upper edge of inclined plane and the upper edge coincidence of side, the lower limb of inclined plane and the inner circle coincidence of bottom surface, the radial extending direction orientation of inclined plane is towards slide head 12 axle center this moment, and side and inclined plane are formed with annular cutting edge in slide head 12 side near spheroid 15.
When the raw material extrusion sliding head 12 in the cavity 3 moves inwards, the cutting ring 122 is driven to move inwards, the annular cutting edge of the cutting ring 122 can break the raw material in the nozzle cavity 111 more easily, so that the sliding head 12 can move inwards for a longer distance under the condition that the pressure difference of two sides along the axial direction of the sliding head is equal, the nozzle cavity 111 is extruded more, more raw material is ensured to flow from the glue injection port 121 to the cavity 3 to fill the residual space, meanwhile, the broken raw material can be folded to the part of the nozzle cavity 111, which is positioned in the sliding head 12, on the inclined surface, and meanwhile, the side edge, which is attached to the nozzle barrel 11, can ensure that the broken raw material cannot leak out of the nozzle 1 along a gap between the cutting ring 122 and the nozzle barrel 11, so that the tightness is ensured, and the realization of automatically filling the residual space is further ensured.
By arranging the cutting ring 122 on the top end of one side of the side wall of the sliding head 12 close to the nozzle barrel 11, the sliding head 12 can move inwards for a longer distance under the condition that the pressure difference along the two sides of the axial direction of the sliding head is equal, so that more raw materials can be ensured to flow from the glue injection port 121 to the cavity 3 to fill the residual space; meanwhile, the side edge of the cutting ring 122 is set to be cylindrical with the diameter equal to that of the inner wall of the nozzle barrel 11, so that broken raw materials are prevented from leaking out of the nozzle 1 along a gap between the cutting ring 122 and the nozzle barrel 11, tightness is ensured, and meanwhile automatic filling of the residual space is further ensured.
Specifically, the ratio of the radial dimension of the neck 131 to the diameter of the sphere 15 is 0.90-0.91, and it is known through practical experiments that when the radial dimension of the neck 131 is 0.88 times of the diameter of the sphere 15, namely, the opening of the neck 131 is smaller, at this time, when injection molding is stopped, the time for the sphere 15 to reach the plugging position after the screw stops moving is 0.9 times of the scheme, the plugging speed is improved to a certain extent, automatic filling of the residual space can be achieved more quickly, however, when injection molding is performed, the flow is only 0.7 times of the scheme, the flow is insufficient when injection molding, the injection molding efficiency is influenced to a larger extent, and when the radial dimension of the neck 131 is 0.93 times of the diameter of the sphere 15, namely, the opening of the neck 131 is larger than the scheme, at this time, the flow is 1.1 times of the scheme, the flow is larger, the injection molding efficiency is improved to a certain extent, however, the distance for the sphere 15 to move towards the charging barrel 2 can be completed, specifically, the time for the sphere 15 to reach the plugging position is 1.3 times of the scheme, compared with the scheme, automatic filling of the residual space is slower, the automatic filling is achieved, the automatic filling of the residual space is achieved, the radial dimension is lower than the diameter of the sphere 131, and the diameter is 0.93 times of the diameter of the sphere is better than the diameter, and the automatic filling of the sphere is achieved, and the automatic filling of the plugging is achieved at the diameter of the sphere 15.
By setting the ratio of the radial dimension of the neck 131 to the diameter of the sphere 15 to 0.90 to 0.91, the realization of automatic filling of the remaining space can be better ensured while taking into consideration the injection efficiency.
In the practical use process, the bearing pipe 13 is in the in-process of preventing backward flow, need bear the pressure of spheroid 15, the probability makes the comparatively complicated neck 131 of structure impaired, when the neck 131 structure is impaired, can't exert the check valve function, for in time changing the maintenance when impaired, the bearing pipe 13 is connected with nozzle tube 11 can be dismantled, concretely speaking, nozzle tube 11 is provided with the installation cavity corresponding to bearing pipe 13, the shape of installation cavity inner wall equals with bearing pipe 13 outer wall, bearing pipe 13 slides and sets up in the installation cavity, when needing to install, insert bearing pipe 13 in the installation cavity, when needing to dismantle, take out bearing pipe 13 from the installation cavity, optionally, the installation cavity opposite side is provided with the structure that can lock or unblock bearing pipe 13, ensure no longer remove after bearing pipe 13 installs.
In order to reduce the deformation degree of the sphere 15 in the process of bearing pressure, the sphere 15 is composed of chromium-molybdenum alloy, the hardness of the chromium-molybdenum alloy is higher, the temperature resistance is better, and the sphere is less easy to deform under the pressure of the molten raw material with higher bearing temperature.
In order to prevent the sliding head 12 from completely entering the nozzle barrel 11, a limiting table is arranged on the outer wall of the sliding head 12, in this embodiment, the limiting table is an annular protrusion arranged on the outer wall of the sliding head 12, the outer diameter of the annular protrusion is larger than that of the nozzle barrel 11, and when the sliding head 12 is ready to completely enter the nozzle barrel 11, the annular protrusion is abutted with the bottom of one end of the outer wall of the nozzle barrel 11, which is close to the sliding head 12, so as to prevent the sliding head 12 from moving further inwards.
In the process that the sphere 15 bears the pressure of the molten raw material, the sphere 15 can be closely contacted with the molten raw material for a long time, at the moment, part of raw material is attached to the surface of the sphere 15 with probability, when the attaching amount is large, the surface of the sphere 15 is uneven, so that the sphere 15 cannot be closely attached to the neck 131, backflow cannot be blocked, the surface of the sphere 15 is provided with a polyurethane coating for avoiding the occurrence of the situation, the polyurethane coating has better heat resistance and chemical resistance, and the attachment of molten plastics can be resisted to a certain extent.
The working principle and the using flow of the invention are as follows:
during injection molding, the raw materials push the sphere 15 forward under the pressure of the screw and the subsequent raw materials until the sphere 15 is no longer in contact with the neck 131; at this time, the molten raw material flows through the sphere 15 from the gap between the sphere 15 and the inner wall of the neck 131, the sphere 15 is continuously pushed until contacting with the valve cover 14, because the surface of the sphere 15 is a sphere, the bottom surface of the valve cover 14 close to the sphere 15 is a plane, so that a gap is left between the sphere 15 and the bottom surface of the valve cover 14, the molten raw material flows from the gap to the bottom surface of the valve cover 14, flows from the runner 141 communicating the two bottom surfaces of the valve cover 14 to the other end of the valve cover 14, enters the nozzle cavity 111 and finally enters the cavity 3 through the glue injection port 121, and injection molding is completed;
After injection molding is stopped, the raw material extrusion sliding head 12 in the cavity 3 moves inwards, when the raw material extrusion sliding head 12 in the cavity 3 is extruded, the raw material in the nozzle cavity 111 flows into the cavity 3 from the glue injection port 121 facing the cavity 3 under the action of the flowing trend, so that the residual space is automatically filled after the raw material in the nozzle cavity 111 is ensured not to flow back;
When the raw material extrusion sliding head 12 in the cavity 3 moves inwards, the cutting ring 122 is driven to move inwards, the annular cutting edge of the cutting ring 122 can break the raw material in the nozzle cavity 111 more easily, so that the sliding head 12 can move inwards for a longer distance under the condition that the pressure difference of two sides along the axial direction of the sliding head is equal, the nozzle cavity 111 is extruded more, more raw material is ensured to flow from the glue injection port 121 to the cavity 3 to fill the residual space, meanwhile, the broken raw material can be folded to the part of the nozzle cavity 111, which is positioned in the sliding head 12, on the inclined surface, and meanwhile, the side edge, which is attached to the nozzle barrel 11, can ensure that the broken raw material cannot leak out of the nozzle 1 along a gap between the cutting ring 122 and the nozzle barrel 11, so that the tightness is ensured, and the realization of automatically filling the residual space is further ensured.
The present invention is not limited to the above embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present invention.
Claims (6)
1. An integral type pressurize of injection molding machine is penetrated mouth, its characterized in that: the nozzle is used for approaching and entering the cavity, the nozzle further comprises a nozzle cylinder, the nozzle cylinder is communicated with the two ends in the axial direction, a sliding head is arranged at one end of the inner wall of the nozzle cylinder in a sliding way, a glue injecting port is arranged at one end of the sliding head, a bearing tube is arranged at one end of the inner wall of the nozzle cylinder, which is far away from the sliding head, and protrudes towards the axis of the nozzle cylinder to form a neck, a sphere is arranged at one end of the neck, which is close to the sliding head, the radial dimension of the neck is smaller than the diameter of the sphere, a valve cover is arranged at one side, which is far away from the neck, of the sphere, a plurality of flow passages are arranged in the axial direction of the nozzle cylinder in a communicating way, and the radial dimension of any flow passage is smaller than the diameter of the sphere;
The neck is provided with a support cone on one side close to the sliding head, a support wall is arranged on one side close to the sliding head, the support cone is in a truncated cone shape, the support wall is in a cylindrical shape, the axes of the support cone and the support wall are coincident with the axis of the nozzle cylinder, and the support cone and the support wall are used for supporting the sphere in a matched mode;
The cutting ring comprises a bottom surface, a side surface and an inclined surface, wherein the radial extending direction of the inclined surface faces towards the axis of the sliding head, the cutting ring is connected with the sliding head through the bottom surface, the side surface is parallel to the side surface of the sliding head, and a cutting edge is formed on the side surface and the inclined surface.
2. The integrated pressure maintaining nozzle of an injection molding machine as set forth in claim 1, wherein: the ratio of the radial dimension of the neck to the sphere diameter is 0.90-0.91.
3. The integrated pressure maintaining nozzle of an injection molding machine as set forth in claim 1, wherein: the bearing tube is detachably connected with the nozzle cylinder.
4. The integrated pressure maintaining nozzle of an injection molding machine as set forth in claim 1, wherein: the sphere is composed of a chromium molybdenum alloy.
5. The integrated pressure maintaining nozzle of an injection molding machine as set forth in claim 1, wherein: the outer wall of the sliding head is provided with a limiting table.
6. The integrated pressure maintaining nozzle of an injection molding machine as set forth in claim 1, wherein: the surface of the sphere is provided with a polyurethane coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311825502.3A CN117549490B (en) | 2023-12-28 | Integral pressure-maintaining injection nozzle of injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311825502.3A CN117549490B (en) | 2023-12-28 | Integral pressure-maintaining injection nozzle of injection molding machine |
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| Publication Number | Publication Date |
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| CN117549490A CN117549490A (en) | 2024-02-13 |
| CN117549490B true CN117549490B (en) | 2024-06-28 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0679747A (en) * | 1992-09-02 | 1994-03-22 | Ado Union Kenkyusho:Kk | Injection nozzle for gas-assisted injection molding |
| KR200357479Y1 (en) * | 2004-03-16 | 2004-07-30 | 엘지전선 주식회사 | A Shut-Off Nozzle Device |
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0679747A (en) * | 1992-09-02 | 1994-03-22 | Ado Union Kenkyusho:Kk | Injection nozzle for gas-assisted injection molding |
| KR200357479Y1 (en) * | 2004-03-16 | 2004-07-30 | 엘지전선 주식회사 | A Shut-Off Nozzle Device |
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