CN113977845B - Injection head valve structure of expected foaming injection machine - Google Patents
Injection head valve structure of expected foaming injection machine Download PDFInfo
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- CN113977845B CN113977845B CN202111403332.0A CN202111403332A CN113977845B CN 113977845 B CN113977845 B CN 113977845B CN 202111403332 A CN202111403332 A CN 202111403332A CN 113977845 B CN113977845 B CN 113977845B
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- injection
- valve
- valve body
- core
- foaming
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Classifications
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- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/36—Feeding the material to be shaped
- B29C44/38—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length
- B29C44/42—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length using pressure difference, e.g. by injection or by vacuum
- B29C44/424—Details of machines
- B29C44/425—Valve or nozzle constructions; Details of injection devices
-
- 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
- B29C45/20—Injection nozzles
- B29C45/23—Feed stopping equipment
- B29C45/231—Needle valve systems therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/48—Wearing apparel
- B29L2031/50—Footwear, e.g. shoes or parts thereof
- B29L2031/504—Soles
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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 provides an injection head valve structure of a foaming expected injection machine, and belongs to the technical field of injection machines. The injection machine solves the problems that the existing injection machine reduces more valves and has low injection efficiency. This injection head valve structure of foaming injection machine is anticipated, this injection head valve structure including the valve body that can be connected with the injection tube front end, the valve body has the valve pocket, is provided with the injection case that can follow the axial displacement of valve body in the valve pocket, the front end of injection case can stretch outside the valve body, has seted up the discharge opening along the axial of injection case on the front end face of injection case, has seted up the feed port that is linked together with the discharge opening on the outer peripheral face of injection case, and when injection case moved backward to extreme position, the feed port is linked together with the valve pocket, and when injection case moved forward to extreme position, the feed port was in the confined state. This structure improves the injection efficiency of injection machine when reducing valve number.
Description
Technical Field
The invention belongs to the technical field of injection machines, and particularly relates to an injection head valve structure of a foaming injection machine.
Background
The injection machine is a main molding device for manufacturing plastic products with various shapes by using a plastic molding die, and specifically, heating plastic, namely, a heating device is arranged on a charging barrel of the injection machine, after plastic particles enter the charging barrel, the heating device heats the plastic particles to a molten state, and then high pressure is applied to the molten plastic through a screw rod arranged in the charging barrel, so that the molten plastic is ejected to fill a die cavity.
At present, chinese patent net discloses an injection mechanism of an injection plastic foaming molding machine [ authorized bulletin number: CN2668374Y, including the conveying pipe and penetrate the material pipe, the conveying pipe rear portion communicates with the hopper, penetrate the material pipe front end and be equipped with and penetrate and chew, it is equipped with and penetrate and chew the switch needle to penetrate in the mouth, it is connected with penetrating and chew the switch hydro-cylinder transmission through crank and connecting rod to penetrate and chew the switch needle, it sets up and penetrates the material seat front end of penetrating the material pipe front end to penetrate and chew through several oblique material penetrating passageway and rear portion material pipe storage chamber intercommunication, this several material penetrating passageway is the toper and gathers and penetrate the mouth in the front end, it is right to penetrate the material seat to penetrate the front end, rear end sliding fit passes and penetrates the material seat, stretch into in the cavity of penetrating the material seat lateral wall, be connected with the valve needle seat that sliding fit inlayed in this cavity, the valve needle seat is articulated with the crank and be connected, the crank is connected with penetrating and is penetrated and is chewed the switch hydro-cylinder transmission through the connecting rod, it articulates with the frame to penetrate to chew the switch hydro-cylinder rear end.
The movement of the nozzle switch valve needle is driven by a crank, a connecting rod and a nozzle switch oil cylinder, so that the opening and closing structure of the nozzle is complex, and in addition, the blanking switch valve is required to be opened and the nozzle switch valve needle is required to be closed in anticipation; when the material is injected, the blanking switch valve is firstly closed, and then the valve needle of the injection nozzle switch is opened; after the injection is completed, the blanking switch valve needs to be opened again, and the injection nozzle switch valve needle is closed. The injection device has the advantages that in the whole injection process, the blanking switch valve and the injection nozzle switch valve needle are matched with each other, the structure is complex, and the opening and closing operation of the switch has a certain time difference and hysteresis, so that the injection efficiency of the injection machine can be influenced.
Disclosure of Invention
The invention aims at solving the problems in the prior art, and provides an injection head valve structure of a foaming injection machine, which aims at solving the technical problems that: how to improve the injection efficiency of the injector while reducing the number of valves.
The aim of the invention can be achieved by the following technical scheme:
The injection head valve structure of the foaming injection machine comprises an injection cylinder and is characterized by comprising a valve body capable of being connected with the front end of the injection cylinder, wherein the valve body is provided with a valve cavity, an injection valve core capable of moving along the axial direction of the valve body is arranged in the valve cavity, the front end of the injection valve core can extend out of the valve body, a discharge hole is formed in the front end face of the injection valve core along the axial direction of the injection valve core, a feed hole communicated with the discharge hole is formed in the outer peripheral face of the injection valve core, when the injection valve core moves backwards to a limit position, the feed hole is communicated with the valve cavity, and when the injection valve core moves forwards to the limit position, the feed hole is in a closed state.
The valve structure of the injection head is arranged at the front end of the injection cylinder through the connecting piece, the valve cavity is communicated with the injection cylinder, when the injection cylinder is expected, the injection valve core is pushed forwards by high-pressure molten material in the injection cylinder, when the injection valve core moves forwards to a limit position, the feeding hole is in a closed state, and the molten material in the injection cylinder cannot enter the discharging hole through the feeding hole, so that the molten material metering accuracy in the injection cylinder is ensured; when the injection cylinder is expected to be finished, the injection cylinder moves forwards, the front end of the injection valve core collides with the sole mould, the injection valve core moves backwards to a limit position, the feeding hole is communicated with the valve cavity at the moment, injection is started, and molten materials in the valve cavity enter the discharging hole through the feeding hole, so that the molten materials are injected into the sole mould; after injection is completed, the injection cylinder moves backwards, so that the injection valve core is gradually separated from the sole mould, at the moment, the injection valve core moves forwards under the action of high-pressure molten material, and when the injection valve core moves forwards to a limit position, the feed hole is in a closed state, and the molten material is prevented from leaking. Compared with the prior art, the injection head valve structure is arranged at the front end of the injection cylinder and replaces the double-valve structure of the blanking switch valve and the injection nozzle switch valve needle, so that the number of valves is reduced, the structural design of opening injection and closing injection of the injection cylinder is greatly simplified, and the manufacturing cost is reduced.
In the valve structure of the injection head of the foaming injection machine, the valve body is further provided with a guide hole communicated with the valve cavity, a step surface is arranged between the guide hole and the valve cavity, the injection valve core comprises a sliding seat and a core body connected with the front end surface of the sliding seat at one end, the sliding seat is arranged in the valve cavity and can be abutted against the step surface, a material passing gap is arranged between the outer peripheral surface of the sliding seat and the inner wall of the valve cavity, the core body is arranged in the guide hole in a sliding mode, and the wall of the guide hole can be used for plugging the feeding hole. Through the setting of this structure, the setting of material clearance makes the valve pocket be linked together all the time with the injection tube, and when the injection case moved forward extreme position, the sliding seat leaned on with the step face mutually, and the pore wall shutoff feed port of guiding hole this moment, during the injection, the injection case moved backward to extreme position, and the preceding terminal surface of injection case flushes with the preceding terminal surface of valve body this moment.
In the valve structure of the injection head of the foaming injection machine, the outer edge of the rear end face of the sliding seat is provided with a chamfer. Through the setting of this structure, during the injection, the design of this chamfer plays the effect of direction to the flow of melt, makes things convenient for the place ahead that the melt can flow to the sliding seat fast, makes things convenient for the injection.
In the valve structure of the injection head of the foaming-expected injection machine, the step surface is a conical surface I, and the front end surface of the sliding seat is a conical surface II which is attached to the conical surface I. Through the setting of this structure, after the injection is accomplished, after the injection case moved forward to extreme position, conical surface one closely laminates with conical surface two, guarantees to have better sealed effect, avoids leaking the material.
In the injection head valve structure of the foaming injection machine, the outer peripheral surface of the rear part of the valve body is provided with threads, the injection head valve structure further comprises a connecting piece, one end of the connecting piece is in threaded connection with the front end of the injection cylinder, and the other end of the connecting piece is in threaded connection with the rear part of the valve body. Through the setting of this structure, the valve body passes through the connecting piece and is connected with the injection tube.
In one of the above-described valve structure for injection head of foam injection machine, the front portion of the valve body has a hexagonal nut. Through the setting of this structure, conveniently block the hex nut through the spanner and rotate the valve body, make things convenient for the installation and the dismantlement of valve body on the injection tube.
In the valve structure of the injection head of the foaming injection machine, the feeding holes are arranged at intervals along the circumferential direction of the injection valve core. Through the setting of this structure, the setting of a plurality of feed inlets makes the material enter into the interior efficient of injection case.
Compared with the prior art, the injection head valve structure of the foaming injection machine has the following advantages: compared with the prior art, the injection head valve structure is arranged at the front end of the injection cylinder and replaces the double-valve structure of the blanking switch valve and the injection nozzle switch valve needle, so that the number of valves is reduced, the structural design of opening injection and closing injection of the injection cylinder is greatly simplified, and the manufacturing cost is reduced.
Drawings
Fig. 1 is a schematic perspective view of the present invention.
Fig. 2 is a schematic cross-sectional structure of the present invention.
Fig. 3 is a schematic cross-sectional view of the injection valve core of the present invention moved forward to a limit position.
Fig. 4 is a schematic cross-sectional view showing the backward movement of the injection valve core to the extreme position according to the present invention.
Fig. 5 is a schematic cross-sectional view of the connector of the present invention.
In the figure, 1, a valve body; 10. a guide hole; 2. injecting a valve core; 20. a discharge hole; 21. a feed hole; 2a, a sliding seat; 2a1, chamfering; 2a2, conical surface II; 2b, a core; 2c, a hexagonal nut; 3. a valve cavity; 4. a material passing gap; 5. and a connecting piece.
Detailed Description
The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1 to 5, the injection head valve structure of the foaming injection machine comprises an injection cylinder, the injection head valve structure comprises a valve body 1 which can be connected with the front end of the injection cylinder, the valve body 1 is provided with a valve cavity 3, an injection valve core 2 which can move along the axial direction of the valve body 1 is arranged in the valve cavity 3, the front end of the injection valve core 2 can extend out of the valve body 1, a discharge hole 20 is formed in the front end surface of the injection valve core 2 along the axial direction of the injection valve core 2, a feed hole 21 which is communicated with the discharge hole 20 is formed in the outer circumferential surface of the injection valve core 2, when the injection valve core 2 moves backwards to a limit position, the feed hole 21 is communicated with the valve cavity 3, and when the injection valve core 2 moves forwards to the limit position, the feed hole 21 is in a closed state. In this embodiment, the valve body 1 further has a guide hole 10 communicating with the valve cavity 3, a step surface 11 is provided between the guide hole 10 and the valve cavity 3, the injection valve core 2 includes a sliding seat 2a and a core body 2b connected to a front end surface of the sliding seat 2a, the sliding seat 2a is located in the valve cavity 3 and the sliding seat 2a can be abutted against the step surface 11, a material passing gap 4 is provided between an outer peripheral surface of the sliding seat 2a and an inner wall of the valve cavity 3, the core body 2b is slidably disposed in the guide hole 10, and a wall of the guide hole 10 can seal the feed hole 21.
The valve body 1 is arranged at the front end of the injection cylinder through the connecting piece 5, the valve cavity 3 is communicated with the injection cylinder, when the injection cylinder is expected, the injection valve core 2 is pushed forward by high-pressure molten material in the injection cylinder, when the injection valve core 2 moves forward to a limit position, the sliding seat 2a is abutted against the step surface 11, at the moment, the hole wall of the guide hole 10 seals the feed hole 21, the feed hole 21 is in a closed state, and molten material in the injection cylinder cannot enter the discharge hole 20 through the feed hole 21, so that the molten material metering in the injection cylinder is ensured to be accurate; when the injection cylinder is expected to be finished, the injection cylinder moves forwards, the front end of the injection valve core 2 collides with the sole mould, the injection valve core 2 moves backwards, the front end face of the injection valve core 2 is flush with the front end face of the valve body 1at the moment after the injection valve core 2 moves backwards to the limit position, the feeding hole 21 is communicated with the valve cavity 3, injection is started, and molten materials in the valve cavity 3 enter the discharging hole 20 through the feeding hole 21, so that the molten materials are injected into the sole mould; after injection is completed, the injection cylinder moves backwards, so that the injection valve core 2 is gradually separated from the sole mould, at the moment, the injection valve core 2 moves forwards under the action of high-pressure molten material, and when the injection valve core 2 moves forwards to a limit position, the feeding hole 21 is in a closed state, and molten material leakage is avoided. Compared with the prior art, the injection head valve structure is arranged at the front end of the injection cylinder and replaces the double-valve structure of the blanking switch valve and the injection nozzle switch valve needle, so that the number of valves is reduced, the structural design of opening injection and closing injection of the injection cylinder is greatly simplified, and the manufacturing cost is reduced.
As shown in fig. 2, in this embodiment, the feed holes 21 are provided in a plurality, and the feed holes 21 are arranged at intervals along the circumferential direction of the injection valve core 2.
As shown in fig. 2,3 and 4, the outer edge of the rear end face of the sliding seat 2a is provided with a chamfer 2a1, and the chamfer 2a1 has a guiding function on the flow of the molten material during injection, so that the molten material can flow to the front of the sliding seat 2a quickly and is convenient to inject. The step surface 11 is a conical surface I, the front end surface of the sliding seat 2a is a conical surface II 2a2 attached to the conical surface I, after injection is completed, the injection valve core 2 moves forwards to the limit position, and the conical surface I is tightly attached to the conical surface II 2a2, so that a good sealing effect is ensured, and material leakage is avoided.
As shown in fig. 1 and 5, the outer peripheral surface of the rear part of the valve body 1 is provided with threads, the valve structure of the injection head also comprises a connecting piece 5, one end of the connecting piece 5 is in threaded connection with the front end of the injection cylinder, the other end of the connecting piece 5 is in threaded connection with the rear part of the valve body 1, the front part of the valve body 1 is provided with a hexagonal nut 2c, the hexagonal nut 2c is clamped by a wrench to rotate the valve body 1 conveniently, and the valve body 1 is installed and detached on the injection cylinder conveniently.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (5)
1. The injection head valve structure of the expected foaming injection machine comprises an injection cylinder and is characterized in that the injection head valve structure comprises a valve body (1) which can be connected with the front end of the injection cylinder, the valve body (1) is provided with a valve cavity (3), an injection valve core (2) which can move along the axial direction of the valve body (1) is arranged in the valve cavity (3), the front end of the injection valve core (2) can extend out of the valve body (1), a discharge hole (20) is formed in the front end surface of the injection valve core (2) along the axial direction of the injection valve core (2), a feed hole (21) which is communicated with the discharge hole (20) is formed in the outer circumferential surface of the injection valve core (2), when the injection valve core (2) moves backwards to the limit position, the feed hole (21) is communicated with the valve cavity (3), and when the injection valve core (2) moves forwards to the limit position, the feed hole (21) is in a closed state. The valve body (1) is further provided with a guide hole (10) communicated with the valve cavity (3), a step surface (11) is arranged between the guide hole (10) and the valve cavity (3), the injection valve core (2) comprises a sliding seat (2 a) and a core body (2 b) connected with the front end surface of one end of the sliding seat (2 a), the sliding seat (2 a) is positioned in the valve cavity (3) and can be abutted to the step surface (11), a material passing gap (4) is formed between the outer peripheral surface of the sliding seat (2 a) and the inner wall of the valve cavity (3), the core body (2 b) is arranged in the guide hole (10) in a sliding mode, the hole wall of the guide hole (10) can block a feeding hole (21), threads are formed in the outer peripheral surface of the rear portion of the valve body (1), one end of the connecting piece (5) is in threaded connection with the front end of the injection cylinder, and the other end of the connecting piece (5) is in threaded connection with the rear portion of the valve body (1).
2. A valve structure of an injection head of a foaming-expected injection machine according to claim 1, characterized in that the outer edge of the rear end face of the sliding seat (2 a) is provided with a chamfer (2 a 1).
3. The valve structure of the injection head of the foaming-expected injection machine according to claim 1, wherein the step surface (11) is a conical surface one, and the front end surface of the sliding seat (2 a) is a conical surface two (2 a 2) which is attached to the conical surface one.
4. Injection head valve structure of a foaming-anticipated injection machine according to claim 1, characterized in that the front part of the valve body (1) is provided with a hexagonal nut (2 c).
5. The injection head valve structure of the foaming-expected injection machine according to claim 1, wherein the feeding holes (21) are arranged in a plurality of mode, and the feeding holes (21) are arranged at intervals along the circumferential direction of the injection valve core (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111403332.0A CN113977845B (en) | 2021-11-24 | 2021-11-24 | Injection head valve structure of expected foaming injection machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111403332.0A CN113977845B (en) | 2021-11-24 | 2021-11-24 | Injection head valve structure of expected foaming injection machine |
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| Publication Number | Publication Date |
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| CN113977845A CN113977845A (en) | 2022-01-28 |
| CN113977845B true CN113977845B (en) | 2024-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111403332.0A Active CN113977845B (en) | 2021-11-24 | 2021-11-24 | Injection head valve structure of expected foaming injection machine |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN216267208U (en) * | 2021-11-24 | 2022-04-12 | 温岭市横峰新沃机械厂 | Injection head valve structure of anticipated foaming injection machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2782419B2 (en) * | 1994-12-29 | 1998-07-30 | 日精樹脂工業株式会社 | Backflow prevention method for pre-plastic injection device |
| KR200357479Y1 (en) * | 2004-03-16 | 2004-07-30 | 엘지전선 주식회사 | A Shut-Off Nozzle Device |
| CN102069552B (en) * | 2010-11-22 | 2012-12-12 | 北京化工大学 | Spring nozzle for differential injection molding |
| CN208232205U (en) * | 2017-12-28 | 2018-12-14 | 积康螺杆制造（上海）股份有限公司 | A kind of pneumatic nozzle |
| CN209580319U (en) * | 2018-11-06 | 2019-11-05 | 和卓喷嘴阀门系统（宁波）有限公司 | For processing the pressure jet apparatus of elastomer |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN216267208U (en) * | 2021-11-24 | 2022-04-12 | 温岭市横峰新沃机械厂 | Injection head valve structure of anticipated foaming injection machine |
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| CN113977845A (en) | 2022-01-28 |
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