CN111890635A

CN111890635A - Linkage valve needle sealing glue nozzle

Info

Publication number: CN111890635A
Application number: CN202010721893.4A
Authority: CN
Inventors: 高建平; 肖加云; 肖锐
Original assignee: Gillkon Screw Manufacturing Shanghai Co ltd
Current assignee: Gillkon Screw Manufacturing Shanghai Co ltd
Priority date: 2020-07-24
Filing date: 2020-07-24
Publication date: 2020-11-06

Abstract

The invention discloses a linkage valve needle sealing glue injection nozzle which comprises an injection nozzle, an injection nozzle middle seat, an injection nozzle middle body and a valve needle, wherein an assembly groove is formed in the end surface of the far end of the injection nozzle middle body along the radial direction of the injection nozzle middle body, and a driving lever is hinged in the assembly groove through a fixing pin; the top end of the driving lever is hinged with the near end of the valve needle, and the bottom end of the driving lever is hinged with a telescopic rod of a driving mechanism arranged outside the middle body of the jet nozzle; the driving lever is driven by the driving mechanism to synchronously push the far end of the valve needle to move along the axial direction of the valve needle so as to close or open the glue injection port of the injection nozzle. According to the linkage valve needle glue sealing nozzle provided by the invention, the driving lever and the valve needle are arranged in a linkage manner, so that the pressure loss during injection of an injection molding machine is thoroughly released, the reject ratio of products is reduced, the glue sealing and production are more stable, and the application range is wide; and the split type structural design is adopted, the quick replacement can be realized, the equipment maintenance is simple and convenient, and the production cost is reduced.

Description

Linkage valve needle sealing glue nozzle

Technical Field

The invention relates to an injection molding machine injection nozzle, in particular to a linkage valve needle sealing glue injection nozzle.

Background

At present, injection molding products are widely applied in the industries of automobiles, electronics, connectors and the like, and the most used in the industries are high-temperature engineering plastics such as PA, PPS, PBT, LCP and the like, and the high-temperature engineering plastics are easy to generate glue overflow or wire drawing in the production process, so that the appearance, the weight and the size of the products are extremely badly influenced.

In general, in the industry, a cut-off device is added to a nozzle to prevent plastic with a certain internal pressure from flowing outwards in a cut-off material pipe, and such nozzles are well known in the industry, and there are an inner spring sealing glue nozzle which adds a spring inside the nozzle and combines with a sealing glue valve needle, and an outer spring nozzle which sets a spring outside the nozzle and pushes the sealing glue valve needle inside. However, the structural design that the spring is adopted to push the glue sealing valve needle has a serious problem, for example, if the injection pressure loss is large, the spring is easy to fatigue at high temperature, the valve needle is blocked and the like, so that long-time shutdown repair is caused, and the labor cost is high.

In addition, the inventor designs a nozzle for sealing the rubber in the inner hole with the valve needle in the published patent CN109318446A, which achieves the purpose of sealing the rubber by driving the valve needle through an external cylinder or oil cylinder, but because the retraction of the valve needle is completely forced to retract by the force of flowing plastic on the valve needle with pressure difference, the valve needle may not retract or retract in place occasionally in the production of special products or special injection molding machines, so that the phenomenon of retraction failure or retraction failure may occur once the valve needle valve sleeve suffers from working fatigue or carbonization of plastic.

In conclusion, it can also be said that no wire drawing prevention nozzle can achieve zero pressure loss at present, when a precisely formed product is produced, pressure is the most critical forming condition, and if the pressure is unstable or has pressure loss, the product can be sometimes not filled, sometimes burrs are formed, and the defect that the production process is extremely unstable is caused.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a linkage valve needle sealing glue injection nozzle without any pressure loss during injection, which completely releases the pressure loss during injection of an injection molding machine, reduces the reject ratio of products and ensures that the sealing glue and the production are more stable.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention provides a linkage valve needle sealing glue injection nozzle which comprises an injection nozzle, an injection nozzle middle seat, an injection nozzle middle body and a valve needle, wherein an assembly groove is formed in the end surface of the far end of the injection nozzle middle body along the radial direction of the injection nozzle middle body, and a driving lever is hinged in the assembly groove through a fixing pin;

the top end of the driving lever is hinged with the near end of the valve needle, and the bottom end of the driving lever is hinged with a telescopic rod of a driving mechanism arranged outside the middle body of the jet nozzle;

the driving lever is driven by the driving mechanism to synchronously push the far end of the valve needle to move along the axial direction of the valve needle so as to close or open the glue injection port of the injection nozzle.

Furthermore, on the linkage valve needle glue sealing nozzle, the driving lever is in a wrench shape, and the top opening of the driving lever is meshed and connected with the pin at the near end of the valve needle.

Furthermore, on the linkage valve needle seals the glue and penetrates and chews, penetrate the axle hole of chewing the middle seat and constitute by holding chamber and sealed chamber, the diameter that holds the chamber is greater than the diameter in sealed chamber, just be provided with the valve barrel in the sealed chamber, the valve barrel with the valve needle precision fit.

Preferably, the linkage valve needle glue sealing injection nozzle is provided with a plurality of discharge runners at intervals on the circumferential inner wall of the accommodating cavity, and the injection nozzle middle body is provided with a plurality of feeding runners communicated with the discharge runners one by one along the axial direction.

Further preferably, on the linkage valve needle glue sealing nozzle, a limiting block is arranged on the peripheral wall of the proximal end of the valve needle, and the limiting block is located in the accommodating cavity and can be in abutting connection with the distal end face of the valve sleeve.

Further, on linkage needle sealed glue jeting mouth, still include:

and the material pipe connecting body is connected with the near end of the jet nozzle middle body through a fixing flange, and an inner shaft hole of the material pipe connecting body is communicated with a feeding flow channel on the jet nozzle middle body.

Preferably, the driving mechanism is detachably fixed on the material pipe connecting body through a support frame on the linkage valve needle glue sealing nozzle.

Furthermore, on the linkage valve needle glue sealing injection nozzle, a first heating ring is sleeved on the outer peripheral wall of the injection nozzle; and a second heating ring is sleeved on the peripheral walls of the middle seat and the middle body of the injection nozzle.

Furthermore, on the linkage valve needle glue sealing injection nozzle, the length of the injection nozzle is 30-300mm, the outer diameter is 35-200mm, and the aperture of the glue injection opening is 5-50 mm.

Furthermore, on the linkage valve needle sealing glue nozzle, the length of the valve needle is 60-600 mm; the length of the middle body of the injection nozzle is 65-300 mm.

By adopting the technical scheme, compared with the prior art, the invention has the following technical effects:

(1) the driving lever and the valve needle are arranged in a linkage manner, so that the pressure loss of the injection molding machine during injection is thoroughly released, the reject ratio of products is reduced, the glue sealing and production are more stable, the plastic sealing and production can be used for long-term production under the common production working condition and stable production under the complex working condition, the thermosetting plastic sealing and production device can also be used for thermosetting plastics, and the application range is wide;

(2) the fit tolerance between the valve needle and the valve sleeve is very precise, and the surface of the valve needle is provided with a high-temperature-resistant, corrosion-resistant and wear-resistant coating, so that the valve needle has good sealing performance; the head of the valve needle and the sealing part of the injection nozzle can be ground and matched again after long-term use or abrasion, the installation and the replacement are convenient, and the equipment maintenance cost is low;

(3) a first heating ring is assembled on the injection nozzle, a second heating ring is assembled on the injection nozzle middle seat and the injection nozzle middle body, and two temperature sensing probes are arranged, so that the temperature of the whole set of sealing glue injection nozzle is ensured to be more uniform and stable;

(4) the length and size of the injection nozzle and the needle valve can be designed according to the size of a middle hole of a front template of an injection molding machine with different tonnages, the injection nozzle and the needle valve can be used on a horizontal injection molding machine and a vertical injection molding machine, and the injection nozzle and the needle valve are particularly suitable for machines with large-tonnage and large-diameter screws and are wide in applicable machine types.

Drawings

FIG. 1 is a schematic cross-sectional view of a linkage valve needle sealant nozzle in a closed state according to the present invention;

FIG. 2 is a schematic cross-sectional view of an open-state joint valve needle sealant nozzle according to the present invention;

FIG. 3 is a schematic diagram of a right view structure of a linkage valve needle sealing compound nozzle of the present invention;

FIG. 4 is a schematic structural diagram of a valve needle in a linkage valve needle sealing compound nozzle according to the present invention;

wherein the reference symbols are:

1-injection nozzle, 2-injection nozzle middle seat, 3-injection nozzle middle body, 4-material pipe connector, 5-fixing flange, 6-valve needle, 7-valve sleeve, 8-assembling groove, 9-driving lever, 10-fixing pin, 11-driving mechanism, 12-supporting frame, 13-positioning bolt, 14-discharging flow channel, 15-feeding flow channel, 16-first heating ring, 17-second heating ring and 18-limiting block.

Detailed Description

The present invention will be described in detail and specifically with reference to the following examples to facilitate better understanding of the present invention, but the following examples do not limit the scope of the present invention.

With continuing reference to fig. 1 and fig. 2, fig. 1 is a schematic cross-sectional view of a linkage valve needle sealing compound injection nozzle in a state of being completely closed, and when a valve core is in a closed state, an injection molding machine can perform other actions such as sol, mold opening, ejection and the like; and fig. 2 is a schematic sectional view of the linkage valve needle sealing adhesive nozzle in an open state, at which time the injection molding machine can perform injection and withdrawal actions. The linkage valve needle sealing adhesive injection nozzle provided by the embodiment is arranged at the front end of a material pipe of an injection molding machine and is in contact with a mold, the linkage valve needle sealing adhesive injection nozzle can be quickly replaced, individual parts can be simply and conveniently repaired and disassembled, the repair and maintenance cost is extremely low, the technical requirement on operators is not high, and the linkage valve needle sealing adhesive injection nozzle can be used for high-temperature engineering plastic thermoplastic plastics and can also be used for an EVA (ethylene vinyl acetate) foaming molding injection molding machine.

Referring to fig. 1, the present embodiment provides a linkage valve needle sealing adhesive injection nozzle, which includes an injection nozzle 1, an injection nozzle middle seat 2, an injection nozzle middle body 3, a material pipe connecting body 4, and a valve needle 6, where the valve needle 6 is movably disposed in the axial inner holes of the injection nozzle 1 and the injection nozzle middle seat 2, and the conical distal end of the valve needle 6 is matched with the adhesive injection port of the injection nozzle 1. In the linked valve needle sealing compound nozzle of the embodiment, one end close to the injection mold is taken as a far end, and the near end is taken as a far end away from one end of the injection mold. From overall structure, this linkage needle seals glues and penetrate and chew and adopt split type modular structure, penetrates the split type design that the well seat has been designed into by traditional integral type and has been chewed well seat 2 and penetrating 3 constitutions of chewing by penetrating, and processing is convenient, and the polishing of axle hole and mounting groove is more directly perceived, no dead angle step.

This linkage needle seals glues and penetrates and chew, sets up drive lever 9 and the linkage of needle 6, and loss of pressure when thoroughly releasing the injection molding machine injection, traditional inner spring of contrast and outer spring seal glue are penetrated the mouth and are generally built-in needle external drive's the glue and penetrate the advantage and lie in the loss of pressure when thoroughly releasing the injection molding machine injection, reduce the product defective rate, seal glue more stable with production. The linkage valve needle sealing adhesive injection nozzle can be used for long-term production such as PP, PE, ABS, PC, PS, EVA foaming and the like under common production working conditions, can be used for stable production such as PA, PPS, PEK, PPSU, PBT, LCP and the like under complex working conditions, and can also be used for thermosetting plastic production such as silica gel.

Referring to fig. 1 and fig. 2, the linkage valve needle sealing compound injection nozzle provided in this embodiment is used to solve the problem that the existing precision molded product is not fully pressed and burrs are formed when the product is pressed due to unstable pressure or pressure loss, which causes unstable production. The main technical scheme is that an assembly groove 8 is arranged on the end surface of the far end of the jet nozzle middle body 3 along the radial direction of the end surface, and a driving lever 9 is hinged in the assembly groove 8 through a fixing pin 10; the top end of the driving lever 9 is hinged with the near end of the valve needle 6, and the bottom end is hinged with a telescopic rod of a driving mechanism 11 arranged outside the jet nozzle middle body 3. The driving lever 9 is driven by the driving mechanism 11 to synchronously push the distal end of the valve needle 6 to move along the axial direction of the valve needle so as to close or open the glue injection port of the injection nozzle 1. Namely, the valve needle 6 is driven to actively move forward or backward by the driving mechanism 11 arranged outside through the driving lever 9, thereby overcoming the defect that the valve needle does not move backward or move backward in place in the prior injection molding machine for producing special products or special injection molding machines.

In this embodiment, and with continued reference to fig. 1 and 2, the actuating lever 9 is in the form of a wrench, the top opening of which is snap-coupled to a pin at the proximal end of the valve needle 6. When the linkage valve needle glue sealing nozzle is assembled, the driving lever 9 is inserted into the assembling groove 8, the opening at the top of the driving lever 9 is enabled to be meshed with the pin at the near end of the valve needle 6, the fixing pin 10 is inserted into the nozzle middle body 3, and the fixing pin 10 is located at the middle position of the assembling groove 8, so that the driving lever 9 is fixed in the assembling groove 8 without influencing the moving range of the driving lever 9.

In this embodiment, please refer to fig. 1 and fig. 2 continuously, the inner shaft hole of the injection nozzle middle seat 2 is composed of an accommodating cavity and a sealing cavity, which are not marked in the drawings, the diameter of the accommodating cavity is larger than that of the sealing cavity, a valve sleeve 7 is arranged in the sealing cavity, the valve sleeve 7 is locked and fixed by a positioning screw 13 embedded in the injection nozzle middle seat 2, the valve sleeve 7 is sleeved on the valve needle 6, the valve sleeve 7 is precisely matched with the valve needle 6, the matching tolerance between the valve needle 6 and the valve sleeve 7 is very precise, and a high temperature resistant, corrosion resistant and wear resistant coating is attached to the outer surface of the valve needle 6, so as to ensure excellent sealing performance between the valve needle 6 and the valve sleeve 7 in the process of moving forward or backward.

In this embodiment, as shown in fig. 1 and fig. 2, a plurality of discharging flow channels 14 are spaced apart from each other on the circumferential inner wall of the accommodating cavity, and a plurality of feeding flow channels 15 communicated with the plurality of discharging flow channels 14 are formed on the nozzle middle body 3 along the axial direction thereof. In addition, this linkage needle seals glues and penetrates and chew still includes: and the material pipe connecting body 4 is connected with the near end of the jet nozzle middle body 3 through a fixing flange 5, and an inner shaft hole of the material pipe connecting body 4 is communicated with a feeding flow passage 15 on the jet nozzle middle body 3. The near end of the injection nozzle middle body 3 is connected with a material pipe connector 4, sol enters the accommodating cavity through an inner hole of the material pipe connector 4 through a feeding flow passage 15 and a discharging flow passage 14, and then is injected into the mold from a glue injection port of the injection nozzle 1.

In this embodiment, as shown in fig. 4, a stop block 18 is disposed on the outer peripheral wall of the proximal end of the valve needle 6, the stop block 18 is located in the accommodating cavity and can be in interference connection with the distal end surface of the valve sleeve 7, and the stop block 18 plays a role in limiting during the retraction of the valve needle 6.

In the present embodiment, please refer to fig. 3, the driving mechanism 11 is detachably fixed on the material pipe connecting body 4 through a supporting frame 12. The driving mechanism 6 can be in a pneumatic, hydraulic or electric form according to actual production requirements, such as a telescopic cylinder, a telescopic oil cylinder or an electric push rod. Preferably, in order to ensure the stability of the operation of the radial valve needle sealing glue nozzle, the driving mechanism 13 adopts a telescopic oil cylinder, a high-temperature-resistant and wear-resistant sealing ring combination is adopted in the oil cylinder, and a cooling water path is designed on the cylinder body, so that the service lives of the oil cylinder and the sealing piece can be effectively prolonged. In the linkage valve needle sealing glue nozzle, the inner diameter of the adopted telescopic cylinder is 38mm-160mm, and the inner diameter of the adopted telescopic cylinder is 25mm-150 mm.

In the present embodiment, as shown in fig. 1 and fig. 2, a first heating ring 16 is sleeved on the outer circumferential wall of the nozzle 1; and a second heating ring 17 is sleeved on the peripheral walls of the injection nozzle middle seat 2 and the injection nozzle middle body 3. The first heating ring 16 and the second heating ring 17 both adopt ceramic heating rings. The first heating ring 16 is assembled on the injection nozzle 1, the second heating ring 17 is assembled on the injection nozzle middle seat 2 and the injection nozzle middle body 3, and the two temperature sensing probes are arranged on the injection nozzle and the injection nozzle middle seat 2, so that the temperature of the whole set of sealing glue injection nozzle is ensured to be more uniform and stable.

In the embodiment, the length and the size of the injection nozzle 1 and the needle valve 6 can be designed according to the size of a hole in a front template of an injection molding machine with different tonnages, specifically, the length of the injection nozzle 1 is 30-300mm, the outer diameter is 35-200mm, and the aperture of a glue injection port is 5-50 mm; preferably, the length of the injection nozzle 1 is 100-300mm, the outer diameter is 80-200mm, and the aperture of the glue injection opening is 15-50 mm; more preferably, the length of the injection nozzle 1 is 200-300mm, the outer diameter is 150-200mm, and the aperture of the glue injection port is 35-50 mm. The length of the valve needle 6 is 60-600 mm; the length of the injection nozzle middle body 3 is 65-300 mm; preferably, the length of the valve needle 6 is 200-600 mm; the length of the injection nozzle middle body 3 is 100-300 mm; more preferably, the length of the valve needle 6 is 400-600 mm; the length of the injection nozzle middle body 3 is 250-300 mm. The screw rod forming machine can be used on a horizontal injection molding machine and a vertical injection molding machine, is particularly suitable for machines with large-tonnage and large-diameter screw rods, and has wide applicable machine types.

As shown in fig. 1 and fig. 2, the operating principle of the linked valve needle sealing nozzle provided in this embodiment is as follows: when the plasticized plastic flows from the material pipe connecting body 4 to the containing cavity of the injection nozzle middle seat 2 through the injection nozzle middle body 3, a plurality of feeding runners 15 and discharging runners 14 are arranged at the axial positions of the injection nozzle middle body 3 and the injection nozzle middle seat 2; when the driving mechanism 11 drives the telescopic rod to move forwards, the valve needle 6 is pushed backwards by the injection pressure, and the plastic flows into the mold from the glue injection port in the middle of the injection nozzle 1; after the injection is finished, the driving mechanism 11 drives the telescopic rod to move backwards, the driving lever 9 is pushed to rotate around the fixed pin 10, the driving lever 9 pushes the valve needle 6 to move forwards along the axial direction, and after the valve needle 6 is completely contacted and tightly pressed with the inclined plane of the inner wall of the glue injection opening of the injection nozzle 1, the completion of glue injection is indicated; when the piston of the oil cylinder moves forwards before injection, the lever is connected with the valve needle, and the valve needle is driven backwards at the same time, namely the valve needle is opened, so that zero pressure loss is achieved.

In addition, the pneumatic molding nozzle disclosed in the published patent CN109318446A, which cannot be directly connected to the valve needle, has several problems: firstly, the pneumatic sealing glue injection nozzle has smaller volume, small valve needle and small lever, and cannot be designed into a pin linkage structure because of insufficient stress and the influence of the overall dimension; secondly, if the valve needle is designed to be too large, the phenomenon that the valve needle and the valve sleeve are clamped easily can be caused; thirdly, the structure of the middle body of the injection nozzle determines that if the middle body is designed into a linkage structure, the structure of the middle body which is integrated with the injection nozzle cannot be used for installing or disassembling the lever and the middle body of the valve needle. The inventor of the application creatively adopts a split type middle body structure design aiming at the defects of CN109318446A and matches with a specially designed driving mechanism, thereby realizing the linkage function.

The embodiments of the present invention have been described in detail, but the embodiments are merely examples, and the present invention is not limited to the embodiments described above. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, equivalent changes and modifications made without departing from the spirit and scope of the present invention should be covered by the present invention.

Claims

1. The linkage valve needle glue sealing injection nozzle comprises an injection nozzle (1), an injection nozzle middle seat (2), an injection nozzle middle body (3) and a valve needle (6), and is characterized in that an assembly groove (8) is formed in the end face of the far end of the injection nozzle middle body (3) along the radial direction of the injection nozzle middle body, and a driving lever (9) is hinged in the assembly groove (8) through a fixing pin (10);

the top end of the driving lever (9) is hinged with the near end of the valve needle (6), and the bottom end of the driving lever is hinged with a telescopic rod of a driving mechanism (11) arranged outside the jet nozzle middle body (3);

the driving lever (9) is driven by the driving mechanism (11) to synchronously push the distal end of the valve needle (6) to move along the axial direction of the valve needle so as to close or open the glue injection opening of the injection nozzle (1).

2. The nozzle of claim 1, wherein the actuating lever (9) is in the form of a wrench, and the top opening of the actuating lever is engaged with a pin at the proximal end of the valve needle (6).

3. The linkage valve needle glue sealing injection nozzle as claimed in claim 1, characterized in that the shaft inner hole of the injection nozzle middle seat (2) is composed of an accommodating cavity and a sealing cavity, the diameter of the accommodating cavity is larger than that of the sealing cavity, a valve sleeve (7) is arranged in the sealing cavity, and the valve sleeve (7) is precisely matched with the valve needle (6).

4. The linkage valve needle sealing adhesive injection nozzle according to claim 3, wherein a plurality of discharging flow channels (14) are arranged on the circumferential inner wall of the accommodating cavity at intervals, and a plurality of feeding flow channels (15) which are communicated with the plurality of discharging flow channels (14) one by one are arranged on the injection nozzle middle body (3) along the axial direction.

5. The linkage valve needle glue sealing nozzle according to claim 3, characterized in that a stop block (18) is arranged on the outer peripheral wall of the proximal end of the valve needle (6), and the stop block (18) is located in the accommodating cavity and can be in interference connection with the distal end face of the valve sleeve (7).

6. The encapsulating nozzle of claim 1, further comprising:

and the material pipe connecting body (4) is connected with the near end of the jet nozzle middle body (3) through a fixing flange (5), and an inner shaft hole of the material pipe connecting body (4) is communicated with a feeding flow channel (15) on the jet nozzle middle body (3).

7. The nozzle of claim 6, wherein the driving mechanism (11) is detachably fixed on the material pipe connector (4) through a support frame (12).

8. The linkage valve needle sealing compound injection nozzle according to claim 1, characterized in that a first heating ring (16) is sleeved on the peripheral wall of the injection nozzle (1); and a second heating ring (17) is sleeved on the peripheral walls of the injection nozzle middle seat (2) and the injection nozzle middle body (3).

9. The linkage valve needle sealing adhesive injection nozzle of claim 1, wherein the length of the injection nozzle (1) is 30-300mm, the outer diameter is 35-200mm, and the aperture of the glue injection opening is 5-50 mm.

10. The linkage valve needle sealing compound nozzle according to claim 1, wherein the length of the valve needle (6) is 60-600 mm; the length of the injection nozzle middle body (3) is 65-300 mm.