CN115256833A - Structure capable of accurately controlling pre-molding back pressure - Google Patents
Structure capable of accurately controlling pre-molding back pressure Download PDFInfo
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- CN115256833A CN115256833A CN202210774281.0A CN202210774281A CN115256833A CN 115256833 A CN115256833 A CN 115256833A CN 202210774281 A CN202210774281 A CN 202210774281A CN 115256833 A CN115256833 A CN 115256833A
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- channel
- diameter
- valve seat
- section
- valve body
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- 238000000465 moulding Methods 0.000 title claims abstract description 23
- 238000001746 injection moulding Methods 0.000 claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 241000521257 Hydrops Species 0.000 description 3
- 206010030113 Oedema Diseases 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007766 curtain coating Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/34—Moulds having venting means
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a structure capable of accurately controlling pre-molding back pressure, which comprises a front valve body, wherein the front valve body is clamped at the front end of a plasticizing part of an injection molding machine, and the front valve body comprises: the valve needle is clamped at the front end of the check spring; the bottom of the check spring is clamped at the rear end of a channel where the valve needle is located, the diameter of the check spring is larger than the diameter of a channel opening at the bottom and smaller than the diameter of the channel where the valve needle is located, the length of the check spring is longer than the length of the channel where the valve needle is located, the valve needle is clamped at the front end of the check spring, and the elastic force of the check spring is 30-50N. The pre-molding device adopts a precise structure, maximally reduces the volume of the device while controlling the pre-molding back pressure, is suitable for mass production, reduces the cost of the device, and reduces the labor cost without manual intervention.
Description
Technical Field
The invention relates to the technical field of injection molding machines, in particular to a structure capable of accurately controlling pre-molding back pressure.
Background
The preplasticizing back pressure (also called plasticizing pressure) refers to the pressure which is applied to the material storage area at the front end of the screw head when the melting rubber part transduces the screw to rotate and retreat. The stable pre-molding back pressure can increase the density of the molten gel, namely, the air in the gel can be exhausted; the stable pre-molding back pressure also makes the glue more uniform. However, the back pressure of the injection molding machine is not good but in a reasonable interval, so that the control of the pre-molding back pressure is an important index. When the back pressure is too high, the plasticizing efficiency can be reduced due to too large back pressure of the molten material, thermal decomposition can occur when the thermal stability of the plastic is poor, the material returning time can be prolonged, and the like; too little melt back pressure results in low melt density and poor plasticizing quality.
At present, most products for controlling the pre-molding back pressure need to introduce a motor to control a system, for example, "a pre-molding injection molding machine" disclosed in the Chinese patent literature, the publication No. CN113459401A, the device controls the pre-molding back pressure in a motor control mode, but the volume of the whole system is greatly influenced by the increase of motor equipment, and because the motor needs to set a fixed pressure, manual intervention is needed during working, and human resources are consumed. The invention adopts the head part clamped on the plasticizing part, effectively has good control function on the pre-plastic back pressure, and reduces the whole volume of the equipment.
Disclosure of Invention
The invention aims to solve the problem that a motor and the like are needed to be adopted to cause a system to consume manpower resources in the prior art for controlling the pre-molding back pressure, and provides a structure capable of accurately controlling the pre-molding back pressure, so that the volume of equipment is reduced while the pre-molding back pressure is controlled, and meanwhile, the labor cost is reduced.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a structure that can accurate control preliminary molding backpressure, includes preceding valve body, preceding valve body card is put at the plastify part front end of injection molding machine, include in the preceding valve body:
the valve needle is clamped at the front end of the check spring, the front valve body channel is blocked by the check spring during glue melting action, the front valve body channel is pushed open by injection force during injection action, and the front valve body channel is through-flow;
the bottom of the check spring is clamped at the rear end of a channel where the valve needle is located, the diameter of the check spring is larger than the diameter of a channel opening at the bottom and smaller than the diameter of the channel where the valve needle is located, the length of the check spring is larger than the length of the channel where the valve needle is located, the valve needle is clamped at the front end, the elasticity is 30-50N, the valve needle is propped under the action of the elasticity during the action of glue melting, and the valve needle is propped under the action of the injection force during the action of injection to generate elastic deformation;
the invention adopts the combination of the check spring and the valve needle, seals the molten rubber by using the check springs with different elastic forces, so that the back pressure of the pre-molding machine is well controlled, and the check spring and the valve needle are small in volume, so that the whole equipment occupies small volume.
As a preferable scheme of the present invention, the front end of the valve needle is an inverted cone structure, the maximum diameter of the inverted cone structure is larger than the diameter of the front valve body channel and smaller than the diameter of the channel, the base of the inverted cone structure is further provided with a support beam, so that a gap is still formed between the structures when the check spring is elastically deformed, and during injection, the melt adhesive can enter the channel where the check spring is located through a gap between the valve needle and the channel, and then flow into the next channel through a gap between the check springs.
As the preferable scheme of the invention, the front valve body and the channel close to the plasticizing part are inverted cones, and the tips of the inverted cones are open, so that liquid accumulation can be prevented, and the melt adhesive pressure can be properly increased, so that the melt adhesive density is higher, and the product quality is higher.
As a preferred scheme of the present invention, a rear valve seat is arranged at the rear end of the front valve body, an inner channel of the rear valve seat is divided into a front section of the rear valve seat, a middle section of the rear valve seat and a rear section of the rear valve seat, a ratio of a channel diameter of the front section of the rear valve seat to a channel diameter of the middle section of the rear valve seat is 1.5, a ratio of the channel diameter of the middle section of the rear valve seat to the channel diameter of the rear section of the rear valve seat is 2.
As the preferred scheme of the invention, the front section of the rear valve seat, the middle section of the rear valve seat and the connection part of the rear section of the rear valve seat are in an inverted cone opening type, so that liquid accumulation can be prevented, the pressure of molten rubber can be properly increased, the density of the molten rubber is higher, and the product quality is higher.
As a preferable scheme of the invention, the front-section channel of the rear valve seat comprises a front-section channel and a rear-section channel, the ratio of the diameter of the rear-section channel to the diameter of the front-section channel is 3.
As a preferable scheme of the invention, the front valve body and the front section of the plasticizing part are connected with a fixing device, the fixing device is a screw part, and the device is prevented from falling off under the action of pressure during injection molding through the fixing device, so that the safety of the device is guaranteed.
As a preferable scheme of the invention, the front valve body and the rear valve seat are sleeved with the protection devices, and the protection devices are hollow cylinders, so that the pipeline of the equipment is protected, the pipeline of the equipment is prevented from being damaged due to outward expansion under pressure, and the service life of the equipment is prolonged.
Therefore, the invention has the following beneficial effects:
1. the structure that adopts check spring and needle to combine has still saved the cost of labor under the prerequisite that can control the back pressure of moulding in advance, has reduced whole volume.
2. All channel connection ends all adopt back taper opening type structure, can prevent the hydrops, can effectively increase melten gel pressure again, make melten gel density improve, and product quality improves thereupon.
3. The rear valve seat channel adopts a diameter decreasing structure, so that molten rubber can be pressurized, the molten rubber density is higher, and the product quality is higher.
Drawings
FIG. 1 is a detailed cross-sectional view of the present invention;
in the figure: the valve comprises a front valve body 1, a rear valve seat 2, a front rear valve seat section 21, a middle rear valve seat section 22, a rear valve seat rear section 23, a valve needle 3, a check spring 4, a plasticizing part 5, a fixing device 6 and a protection device 7.
Detailed Description
The invention is further described with reference to the following detailed description and accompanying drawings.
Referring to fig. 1, the present invention includes a front valve body 1, the front valve body 1 is clamped at the front end of a plasticizing part 5 of an injection molding machine, the front valve body 1 includes: the valve needle 3 is clamped at the front end of the check spring 4, and the section diameter of the valve needle 3 is larger than that of the channel of the front valve body 1 and smaller than that of the channel where the valve needle 3 is located; the bottom of the check spring 4 is clamped at the rear end of the channel where the valve needle 3 is positioned, the front end of the check spring is clamped with the valve needle 3, and the elastic force of the check spring 4 is 3-5 kg; the invention adopts the combination of the check spring 4 and the valve needle 3, seals the molten rubber by using the check springs 4 with different elastic forces, ensures that the pre-molding back pressure is well controlled, and ensures that the whole equipment occupies smaller volume because the check springs 4 and the valve needle 3 have smaller volumes. Preceding valve body 1 is the back taper with the passageway that is close to the plastify part, the tip opening of back taper can prevent the hydrops, also can suitably increase melten gel pressure, makes melten gel density higher, and product quality is higher. The rear end of the front valve body 1 is provided with a rear valve seat 2, a channel in the rear valve seat is divided into a rear valve seat front section, a rear valve seat middle section and a rear valve seat rear section, the ratio of the 21 channel diameter of the rear valve seat front section to the 22 channel diameter of the rear valve seat middle section is 1.5, and the ratio of the 22 channel diameter of the rear valve seat middle section to the 23 channel diameter of the rear valve seat rear section is 2. The back disk seat 2 is back taper opening type in the front and middle of back end junction and can prevent the hydrops, also can suitably increase melten gel pressure, makes melten gel density higher, and product quality is higher. The front valve body 1 and the front section of the plasticizing part 5 are connected with the fixing device 6, and the fixing device 6 is a screw part, so that the device is prevented from falling off under the action of pressure during injection molding through the fixing device 6, and the safety of the device is guaranteed. Preceding valve body 1 all has cup jointed protection device 7 with back disk seat 2 outside, and protection device 7 is hollow cylinder, has protected the equipment pipeline, prevents that it from producing the damage by the outside expansion of pressure, increases equipment life.
The working mode of the injection molding machine during operation is as follows: when the melten gel part 5 of injection molding machine is the melten gel motion, 1 passageway of valve body before the pretightning force of non-return spring 4 is plugged up to 1 passageway of valve body before sealing makes the melten gel unable flow, because non-return spring 4 pretightning force is greater than the back pressure of moulding in advance, the melten gel can't ejecting needle 3, and the sizing material is in complete encapsulated situation, has both solved the curtain coating problem, makes the back pressure of moulding in advance establish again, can have suitable backpressure during letting the injection, and the plastify effect is better. When doing the injection action, non-return spring 4 takes place elastic deformation because of elasticity is less than the injection force, and needle 3 and 1 passageway separation of preceding valve body for the melten gel flows forward, because the injection force is far greater than the back pressure, the melten gel backs down needle 3 and circulates backward, makes and penetrates the volume of gluing and improves, and density improves.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the present invention.
Claims (8)
1. The utility model provides a structure that can accurate control moulds backpressure in advance, characterized by includes preceding valve body, preceding valve body card is put at the plastify part front end of injection molding machine, include in the preceding valve body:
the valve needle is clamped at the front end of the check spring;
the bottom of the check spring is clamped at the rear end of the channel where the valve needle is located, the diameter of the check spring is larger than the diameter of the bottom channel opening and smaller than the diameter of the channel where the valve needle is located, the length of the check spring is larger than the length of the channel where the valve needle is located, the valve needle is clamped at the front end of the check spring, and the elastic force of the check spring is 30-50N.
2. The structure capable of accurately controlling the pre-molding back pressure as claimed in claim 1, wherein the front end of the valve needle is an inverted cone structure, the maximum diameter of the inverted cone structure is larger than the diameter of the front valve body channel and smaller than the diameter of the front valve body channel, and the base of the inverted cone structure is further provided with a supporting beam.
3. The structure of claim 1, wherein the front valve body and the channel near the plasticizing component are inverted cones, and the tips of the inverted cones are open.
4. The structure of claim 1, wherein a rear valve seat is provided at the rear end of the front valve body, the rear valve seat internal passage is divided into a rear valve seat front section, a rear valve seat middle section and a rear valve seat rear section, the ratio of the rear valve seat front section passage diameter to the rear valve seat middle section passage diameter is 1.5.
5. The structure of claim 4, wherein the connection between the front section of the rear valve seat, the middle section of the rear valve seat and the rear section of the rear valve seat is in the shape of an inverted cone opening.
6. The structure of claim 4, wherein the front channel of the rear valve seat comprises a front channel section and a rear channel section, the ratio of the diameter of the rear channel section to the diameter of the front channel section is 3.
7. The structure for precisely controlling the pre-molding back pressure as claimed in claim 1, wherein the front valve body is connected with a fixing device at the front section of the plasticizing part, and the fixing device is a screw part.
8. The structure capable of accurately controlling the premolded back pressure as claimed in claim 1, wherein a protection device is sleeved outside the front valve body and the rear valve seat, and the protection device is hollow cylindrical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210774281.0A CN115256833A (en) | 2022-07-01 | 2022-07-01 | Structure capable of accurately controlling pre-molding back pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210774281.0A CN115256833A (en) | 2022-07-01 | 2022-07-01 | Structure capable of accurately controlling pre-molding back pressure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115256833A true CN115256833A (en) | 2022-11-01 |
Family
ID=83764256
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210774281.0A Pending CN115256833A (en) | 2022-07-01 | 2022-07-01 | Structure capable of accurately controlling pre-molding back pressure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115256833A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102039648A (en) * | 2009-10-12 | 2011-05-04 | 北京化工大学 | Superspeed injection forming machine |
| CN103807473A (en) * | 2012-11-08 | 2014-05-21 | 苏州工业园区咖乐美电器有限公司 | Backpressure valve |
| CN205929314U (en) * | 2016-06-27 | 2017-02-08 | 海天塑机集团有限公司 | Injection molding machine seals material device |
| CN206605734U (en) * | 2016-11-22 | 2017-11-03 | 浙江思纳克热流道科技有限公司 | The needle jet of automatic open close |
| CN107848183A (en) * | 2015-07-08 | 2018-03-27 | 麦克赛尔株式会社 | The manufacture method and manufacture device of foam molding |
| CN207278953U (en) * | 2017-10-10 | 2018-04-27 | 上海泰科龙阀门有限公司 | A kind of silent check valve |
| CN207643579U (en) * | 2017-12-25 | 2018-07-24 | 佛山市顺德区震德精密机械有限公司 | A kind of unidirectional glue sealing structure for fritting machine |
| CN210687122U (en) * | 2019-10-10 | 2020-06-05 | 苏州捷斯恩实业有限公司 | Novel check valve structure |
-
2022
- 2022-07-01 CN CN202210774281.0A patent/CN115256833A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102039648A (en) * | 2009-10-12 | 2011-05-04 | 北京化工大学 | Superspeed injection forming machine |
| CN103807473A (en) * | 2012-11-08 | 2014-05-21 | 苏州工业园区咖乐美电器有限公司 | Backpressure valve |
| CN107848183A (en) * | 2015-07-08 | 2018-03-27 | 麦克赛尔株式会社 | The manufacture method and manufacture device of foam molding |
| CN205929314U (en) * | 2016-06-27 | 2017-02-08 | 海天塑机集团有限公司 | Injection molding machine seals material device |
| CN206605734U (en) * | 2016-11-22 | 2017-11-03 | 浙江思纳克热流道科技有限公司 | The needle jet of automatic open close |
| CN207278953U (en) * | 2017-10-10 | 2018-04-27 | 上海泰科龙阀门有限公司 | A kind of silent check valve |
| CN207643579U (en) * | 2017-12-25 | 2018-07-24 | 佛山市顺德区震德精密机械有限公司 | A kind of unidirectional glue sealing structure for fritting machine |
| CN210687122U (en) * | 2019-10-10 | 2020-06-05 | 苏州捷斯恩实业有限公司 | Novel check valve structure |
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