A needle valve hot runner structure with a quickly detachable valve needle

Abstract

The present application belongs to the technical field of hot runner equipment, and relates to a needle valve hot runner structure with a valve needle capable of being quickly disassembled and assembled. The present application comprises a press plate and a distribution plate, and a piston cylinder sleeve is arranged in the press plate. When plastic powder in the cavity of the hot runner system needs to be cleaned after long-time production, the press plate 1 is directly opened to expose the piston cylinder sleeve 3, and a detachable fixing structure 8 is used to fix the press plate 1 and the distribution plate 2. After being disassembled, the powder can be cleaned, and the maintenance cleaning does not need the distribution plate to be heated. After the cleaning is completed, the parts are reset, the structure does not need to dig a cavity on the press plate, the cavity interval does not need to be considered, the product arrangement is more compact, the overall size of the mold is reduced, the weight of the mold is reduced, the production energy consumption is saved, the steel cost is saved, and in the maintenance process, the valve needle of the corresponding cavity can be individually and specifically replaced, so that the replacement is convenient and fast.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of hot runner equipment, and relates to a needle valve hot runner structure with a valve needle capable of being quickly disassembled and assembled. BACKGROUND

[0002] At present, in the common bottle embryo needle valve hot runner system, a common cylinder piston structure exists, and there is a cumbersome workload in terms of disassembly and cleaning. In addition, the common hot runner needle valve cylinder is basically designed on the press plate, and the multi-point design has higher requirements on machining precision, such as concentricity and position degree. Therefore, in the production process, the needle valve moves for a long time, and there are a lot of powders on the distribution plate. When cleaning, the distribution plate needs to be heated, and then all the valve needles are pulled out, and the distribution plate is lifted to start cleaning the powder. It is difficult to clean, and the maintenance and replacement process is complicated and troublesome, and the workload is large. Therefore, it is urgent to design a needle valve hot runner structure with a valve needle capable of being quickly disassembled and assembled to overcome the above defects.

[0003] In order to overcome the defects of the prior art, people have continuously explored and proposed various solutions. For example, a needle valve type hot runner structure is disclosed in Chinese patent [application number: 202210162235.5], which comprises a main body part and a hot nozzle mounted on the main body part. The inside of the hot nozzle is provided with a needle valve. The outside of the hot nozzle is also provided with a connecting piece, and the inside of the connecting piece is provided with a discharge nozzle. The needle valve is slid downward to make the feed inlet provided at the end of the needle valve pass through the discharge nozzle to realize the conduction of the material. At the same time, the needle valve moves upward to make the feed inlet away from the discharge nozzle to realize the cut-off of the material. The feed inlet completely penetrates the needle valve along the radial direction of the needle valve. Since the needle valve moves downward to conduct the discharge nozzle, and the end of the needle valve is fixed on the core of the product forming, the feed nozzle supplies material from both sides of the needle valve at this time. However, this scheme still has the defects of multiple steps, complicated disassembly and assembly, large workload and difficulty in cleaning when cleaning the powder. SUMMARY

[0004] The purpose of the present application is to provide a needle valve hot runner structure with a valve needle capable of being quickly disassembled and assembled to solve the above problems.

[0005] In order to achieve the above purpose, the following technical scheme is adopted in the present application:

[0006] A needle valve hot runner structure with quick dismountable valve needle, comprising a press plate and a distribution plate, the press plate is internally provided with a piston sleeve, the piston sleeve is internally provided with a piston, the bottom of the piston is provided with a variable diameter elbow, the piston is internally provided with a valve needle element penetrating through the variable diameter elbow, the variable diameter elbow penetrates through the distribution plate, the bottom of the variable diameter elbow is provided with a supporting and fixing structure, the supporting and fixing structure abuts with the bottom of the distribution plate, the length of the valve needle element is greater than the length of the variable diameter elbow, the piston sleeve and the distribution plate are provided with a detachable fixing structure, the bottom of the detachable fixing structure abuts with the distribution plate, and the top of the detachable fixing structure abuts with the press plate.

[0007] In the above-mentioned needle valve hot runner structure with quick dismountable valve needle, the detachable fixing structure comprises a base provided between the piston sleeve and the distribution plate, the bottom of the base is provided with a first sealing ring, the first sealing ring is in clamping connection with the variable diameter elbow, and the base is internally provided with a sleeve positioning portion in clamping connection with the piston sleeve.

[0008] In the above-mentioned needle valve hot runner structure with quick dismountable valve needle, the sleeve positioning portion comprises a positioning ring groove provided in the base, and a plurality of sleeve pressure steps in annular array distribution along the center point of the positioning ring groove are arranged in the positioning ring groove, and the sleeve pressure steps are integrally formed with the base.

[0009] In the above-mentioned needle valve hot runner structure with quick dismountable valve needle, a plurality of dismounting side cavities in annular array distribution along the center point of the positioning ring groove are further arranged in the positioning ring groove, the dismounting side cavities are staggered with the sleeve pressure steps, and the depth of the dismounting side cavities is greater than the height of the sleeve pressure steps.

[0010] In the above-mentioned needle valve hot runner structure with quick dismountable valve needle, the top of the base has an annular fixing step, a second sealing ring is sleeved on the annular fixing step, and the top of the second sealing ring abuts with the bottom of the press plate.

[0011] In the above-mentioned needle valve hot runner structure with quick dismountable valve needle, the valve needle element comprises a hot runner valve needle provided in the piston, the top of the hot runner valve needle extends into the piston, and the lower part penetrates through the variable diameter elbow.

[0012] In the above-mentioned needle valve hot runner structure with quick dismountable valve needle, the length of the hot runner valve needle is greater than the length of the variable diameter elbow, and the diameter of the hot runner valve needle is smaller than the diameter of the variable diameter elbow.

[0013] In the above-mentioned needle valve hot runner structure with quick dismountable valve needle, the supporting and fixing structure comprises a supporting ring provided at the bottom of the variable diameter elbow, the supporting ring is integrally formed with the variable diameter elbow, and the outer diameter of the supporting ring is greater than the diameter of the variable diameter elbow.

[0014] In the needle valve hot runner structure with quick dismountable valve needle, a semi-open slot is formed on the supporting ring.

[0015] In the needle valve hot runner structure with quick dismountable valve needle, a piston cylinder cover is arranged on the top of the piston cylinder sleeve, a third sealing ring is arranged in the piston cylinder cover, the press plate 1 is provided with an air inlet matched with the piston 4, and an air pressure sensing valve is arranged in the air inlet.

[0016] Compared with the prior art, the present application has the following advantages:

[0017] 1. When the plastic powder in the hot runner system cavity needs to be cleaned after a long time of production, the press plate 1 is directly opened to expose the piston cylinder sleeve 3, and the detachable fixing structure 8 is used to fix the press plate 1 and the distributor plate 2, so that the powder can be cleaned after being disassembled, and the maintenance and cleaning do not need the distributor plate to be heated, and the parts are reset after the cleaning is completed, so that the structure does not need to dig cavities on the press plate, the cavity spacing does not need to be considered, the product arrangement is more compact, the overall size of the mold is reduced, the weight of the mold is reduced, the production energy consumption is saved, the steel cost is saved, and the valve needle of the corresponding cavity can be replaced individually during maintenance, which is convenient and fast.

[0018] 2. The cleaning method is changed, the workload is reduced, and the valve needle is prevented from being damaged when the valve needle is pulled out.

[0019] 3. The present application avoids the problems of position precision and concentricity required for processing multiple cavity cylinder holes on the press plate, and the new structure is fixed with the distributor plate after installation, and the piston cylinder cover only needs to achieve the sealing of the third sealing ring, and the cylinder hole on the press plate only needs to achieve the depth size accuracy (low diameter accuracy requirement) to reduce the processing difficulty and cost.

[0020] 4. The press plate in the present application has an air inlet matched with the piston, the air inlet is provided with an air pressure sensing valve, the air pressure value is automatically adjusted (stopped or strengthened) at dynamic high and low peak values, the purpose of keeping the exhaust pressure balanced is ensured, the piston movement state is consistent, the valve needle is opened and closed at the same time, the melt is ensured to enter the cavity synchronously, the product quality and forming efficiency are improved.

[0021] Other advantages, objects and features of the present application will be partially embodied through the following description, and partially understood by those skilled in the art through research and practice of the present application. DETAILED DESCRIPTION

[0022] Figure 1 is a structural schematic diagram of the present application.

[0023] Figure 2 is a structural schematic diagram of another direction of the present application.

[0024] Figure 3 This is a partial structural schematic diagram of the present invention.

[0025] Figure 4 This is a partial structural schematic diagram of another aspect of the present invention.

[0026] Figure 5 This is a schematic diagram of the piston and hot runner valve needle.

[0027] Figure 6 This is a structural diagram of the base.

[0028] In the diagram: 1. Press plate; 2. Diverter plate; 3. Piston cylinder liner; 4. Piston; 5. Variable diameter elbow; 6. Valve needle; 7. Support and fixing structure; 8. Demountable fixing structure; 9. Base; 10. First sealing ring; 11. Cylinder liner positioning part; 12. Positioning ring groove; 13. Cylinder liner pressure bearing step; 14. Disassembly and assembly side cavity; 15. Annular fixing step; 16. Second sealing ring; 17. Hot runner valve needle; 18. Support ring; 19. Semi-open slot; 20. Piston cylinder head; 21. Third sealing ring; 22. Air inlet. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings.

[0030] like Figures 1-6 As shown, a needle valve hot runner structure with a quick-release valve needle includes a press plate 1 and a flow divider plate 2. A piston cylinder liner 3 is installed inside the press plate 1, and a piston 4 is installed inside the piston cylinder liner 3. A reducing elbow 5 is provided at the bottom of the piston 4. A valve needle 6 is provided inside the piston 4 and passes through the reducing elbow 5. The reducing elbow 5 passes through the flow divider plate 2. A supporting and fixing structure 7 is provided at the bottom of the reducing elbow 5. The supporting and fixing structure 7 abuts against the bottom of the flow divider plate 2. The length of the valve needle 6 is greater than the length of the reducing elbow 5. A detachable fixing structure 8 is provided between the piston cylinder liner 3 and the flow divider plate 2. The bottom of the detachable fixing structure 8 abuts against the flow divider plate 2, and the top abuts against the press plate 1.

[0031] In this embodiment, after a long time of production, when it is necessary to clean the plastic powder in the hot runner system cavity, the press plate 1 is directly opened to expose the piston sleeve 3, and the detachable fixing structure 8 is used to fix the press plate 1 and the distributor plate 2. After disassembly, the powder can be cleaned, and the maintenance cleaning does not require the distributor plate to be heated. After the cleaning is completed, the parts are reset, and the structure does not need to be excavated on the press plate. The cavity spacing does not need to be considered, the product arrangement is more compact, the overall size of the mold is reduced, the weight of the mold is reduced, the production energy consumption is saved, the steel material cost is saved, and in the maintenance process, the corresponding valve needle parts of the corresponding cavity can be replaced individually and conveniently and quickly. In terms of processing, the invention avoids the problems of position accuracy and concentricity required for processing multiple cavity cylinder holes on the press plate 1. After the new structure is installed and fixed with the distributor plate 2, the cylinder hole on the press plate 1 only needs to reach the accuracy of the depth size (low diameter accuracy requirement), which reduces the processing difficulty and cost.

[0032] In combination Figures 1-6 As shown, the detachable fixing structure 8 includes a base 9 arranged between the piston sleeve 3 and the distributor plate 2. The base 9 is provided with a first sealing ring 10 at the bottom, the first sealing ring 10 is in clamping connection with the variable elbow 5, and the base 9 is provided with a sleeve positioning portion 11. The piston sleeve 3 is in clamping connection with the sleeve positioning portion 11.

[0033] Specifically, in use, the base 9 is used to fix the press plate 1 and the distributor plate 2, the first sealing ring 10 is in abutment with the distributor plate 2, and the sleeve positioning portion 11 is used to position and clampingly fix the piston sleeve 3, and facilitates subsequent disassembly and replacement of the piston sleeve 3.

[0034] In combination Figure 2 , Figure 6 As shown, the sleeve positioning portion 11 includes a positioning ring groove 12 arranged in the base 9. The positioning ring groove 12 is provided with a plurality of sleeve pressure steps 13 arranged in a ring array around the center point of the positioning ring groove 12. The sleeve pressure steps 13 are integrally formed with the base 9. The positioning ring groove 12 is also provided with a plurality of disassembly side cavities 14 arranged in a ring array around the center point of the positioning ring groove 12. The disassembly side cavities 14 are arranged alternately with the sleeve pressure steps 13. The depth of the disassembly side cavities 14 is greater than the height of the sleeve pressure steps 13.

[0035] In this embodiment, the positioning ring groove 12 and the sleeve pressure steps 13 are used to position and clampingly fix the piston sleeve 3, and facilitate subsequent disassembly and replacement of the piston sleeve 3. When disassembled, the disassembly side cavities 14 can facilitate the disassembly and replacement of the piston sleeve 3 by the operator. The depth of the disassembly side cavities 14 is greater than the height of the sleeve pressure steps 13, so that the disassembly side cavities 14 have sufficient operation space when disassembled.

[0036] In combination Figure 2 ,Figure 6 As shown, the bottom of the base 9 has an annular fixing step 15, and a second sealing ring 16 is sleeved on the annular fixing step 15, and the top of the second sealing ring 16 abuts against the bottom of the press plate 1.

[0037] In this embodiment, the annular fixing step 15 is used to clampingly fix the second sealing ring 16, and the second sealing ring 16 can abut against the bottom of the press plate 1 to realize the sealing of the contact surface.

[0038] The valve needle 6 comprises a hot runner valve needle 17 arranged in the piston 4, the top of the hot runner valve needle 17 extends into the piston 4, and the bottom of the hot runner valve needle 17 penetrates through the reducing elbow 5, the length of the hot runner valve needle 17 is greater than the length of the reducing elbow 5, and the diameter of the hot runner valve needle 17 is smaller than the diameter of the reducing elbow 5.

[0039] In this embodiment, the reducing elbow 5 can be used to protect the hot runner valve needle 17 and improve the service life of the hot runner valve needle 17.

[0040] In combination with Figure 2 As shown, the supporting and fixing structure 7 comprises a supporting ring 18 arranged at the bottom of the reducing elbow 5, the supporting ring 18 is integrally formed with the reducing elbow 5, and the outer diameter of the supporting ring 18 is greater than the diameter of the reducing elbow 5.

[0041] In this embodiment, during the installation process, the supporting ring 18 abuts against the bottom of the shunt plate 2, and the base 9 is matched to fix the reducing elbow 5 up and down, and the fixing effect is good.

[0042] In combination with Figure 1 , Figure 2 As shown, the supporting ring 18 is provided with a semi-open slot 19.

[0043] In this embodiment, the semi-open slot 19 can facilitate the angle adjustment of the supporting ring 18 and the reducing elbow 5 by the operator with tools.

[0044] In combination with Figure 2 As shown, the top of the piston cylinder sleeve 3 is provided with a piston cylinder cover 20, the piston cylinder cover 20 is internally provided with a third sealing ring 21, the press plate 1 is provided with an air inlet 22 matched with the piston 4, and the air inlet 22 is internally provided with a gas pressure sensing valve.

[0045] In this embodiment, the piston cylinder cover 20 is used to cover the top of the piston cylinder sleeve 3, the third sealing ring 21 plays a sealing role, and the new structure is fixed after installation The piston cylinder cover 20 only needs to seal the third sealing ring 2, which reduces the processing difficulty and cost, the press plate 1 has an air inlet 22 matched with the piston 4, the air inlet 22 increases the air pressure sensing valve (not shown in the figure), and the air pressure value is automatically adjusted (stopped or strengthened) at the dynamic high and low peak value, to ensure that the exhaust pressure of each row remains balanced, the piston movement state is consistent, the valve needle 6 is opened and closed at the same time, and the melt is synchronized into the cavity, improving product quality and molding efficiency.

[0046] The working principle of the present application is:

[0047] After a long time of production, when it is necessary to clean the plastic powder in the hot runner system cavity, the press plate 1 is directly opened, the piston cylinder sleeve 3 is exposed, the base 9 is used to fix the press plate 1 and the distributor plate 2, and after disassembly, the powder can be cleaned, and maintenance and cleaning are not required. The distributor plate is heated, and after cleaning is completed, the parts are reset, the structure does not need to be excavated on the press plate, the cavity spacing does not need to be considered, the product arrangement is more compact, the overall size of the mold is reduced, the weight of the mold is reduced, the production energy consumption is saved, the steel cost is saved, and in the maintenance process, the valve needle corresponding to the cavity can be replaced individually and conveniently and quickly,

[0048] In use, the base 9 is used to fix the press plate 1 and the distributor plate 2, the first sealing ring 10 abuts against the distributor plate 2, the positioning ring groove 12 and the cylinder sleeve pressure bearing step 13 are used to position and clampingly fix the piston cylinder sleeve 3, and the subsequent disassembly and replacement of the piston cylinder sleeve 3 are facilitated, when disassembling, the disassembly side cavity 14 can facilitate the operator to disassemble and replace the piston cylinder sleeve 3, the depth of the disassembly side cavity 14 is greater than the height of the cylinder sleeve pressure bearing step 13, and sufficient operation space is ensured for the disassembly side cavity 14 during disassembly,

[0049] The annular fixing step 15 is used for clampingly fixing the second sealing ring 16, and the second sealing ring 16 can abut against the bottom of the press plate 1 to realize the sealing of the contact surface,

[0050] The reducing elbow 5 can be used for protecting the hot runner valve needle 17 and improving the service life of the hot runner valve needle 17,

[0051] During installation, the supporting ring 18 abuts against the bottom of the distributor plate 2, cooperates with the base 9, and fixes the reducing elbow 5 up and down, and the fixing effect is good,

[0052] The semi-open slot 19 can facilitate the operator to adjust the angle of the supporting ring 18 and the reducing elbow 5 with a tool, and the piston cylinder cover 20 is used to cover the top of the piston cylinder sleeve 3, and the third sealing ring 21 plays a sealing role.

[0053] The specific embodiments described herein are merely illustrative of the principles of this application. Numerous modifications or adaptations will be readily apparent to those skilled in the art of this application without departing from the spirit of the application.

[0054] Although the terms press plate 1, flow distribution plate 2, piston sleeve 3, piston 4, reducer elbow 5, valve needle 6, bearing fixing structure 7, detachable fixing structure 8, base 9, first sealing ring 10, sleeve positioning portion 11, positioning ring groove 12, sleeve pressure bearing step 13, disassembly side cavity 14, annular fixing step 15, second sealing ring 16, hot runner valve needle 17, bearing ring 18, semi-open slot 19, piston sleeve cover 20, third sealing ring 21, air inlet 22, etc. are used more frequently herein, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of the application, and any interpretation of them as an additional limitation is contrary to the spirit of the application.

Claims

1. A needle valve hot runner structure with a quick-release valve needle, comprising a press plate (1) and a flow divider plate (2), characterized in that, The press plate (1) is equipped with a piston cylinder liner (3), and the piston cylinder liner (3) is equipped with a piston (4). The piston (4) has a reducing elbow (5) at its bottom. The piston (4) has a valve needle (6) that passes through the reducing elbow (5). The reducing elbow (5) passes through the flow divider plate (2). The reducing elbow (5) has a supporting and fixing structure (7) at its bottom. The supporting and fixing structure (7) abuts against the bottom of the flow divider plate (2). The length of the valve needle (6) is greater than the length of the reducing elbow (5). The piston cylinder liner (3) and the flow divider plate (2) are provided with a detachable fixing structure (8). The bottom of the detachable fixing structure (8) abuts against the flow divider plate (2), and the top abuts against the press plate (1). The detachable fixing structure (8) includes a base (9) disposed between the piston cylinder liner (3) and the flow divider (2). The bottom of the base (9) is provided with a first sealing ring (10), which engages with the reducing elbow (5). The base (9) is provided with a cylinder liner positioning part (11), which engages with the piston cylinder liner (3). The cylinder liner positioning part (11) includes a positioning ring groove (12) disposed in the base (9). The positioning ring groove (12) is provided with a plurality of cylinder liner pressure-bearing steps (13) arranged in a ring array along the center point of the positioning ring groove (12). The cylinder liner pressure-bearing steps (13) are integrally formed with the base (9).

2. The needle valve hot runner structure with a quick-release valve needle according to claim 1, characterized in that, The positioning ring groove (12) is also provided with a number of disassembly and assembly side cavities (14) arranged in a ring array along the center point of the positioning ring groove (12). The disassembly and assembly side cavities (14) are staggered with the cylinder liner pressure-bearing step (13). The depth of the disassembly and assembly side cavities (14) is greater than the height of the cylinder liner pressure-bearing step (13).

3. The needle valve hot runner structure with a quick-release valve needle according to claim 2, characterized in that, The base (9) has an annular fixed step (15) at the top, and a second sealing ring (16) is fitted on the annular fixed step (15). The top of the second sealing ring (16) abuts against the bottom of the press plate (1).

4. The needle valve hot runner structure with a quick-release valve needle according to claim 3, characterized in that, The valve needle component (6) includes a hot runner valve needle (17) disposed in the piston (4), the top of the hot runner valve needle (17) extending into the piston (4) and the lower part passing through the reducing elbow (5).

5. The needle valve hot runner structure with a quick-release valve needle according to claim 4, characterized in that, The length of the hot runner valve needle (17) is greater than the length of the reducing elbow (5), and the diameter of the hot runner valve needle (17) is smaller than the diameter of the reducing elbow (5).

6. The needle valve hot runner structure with a quick-release valve needle according to claim 5, characterized in that, The supporting and fixing structure (7) includes a supporting ring (18) disposed at the bottom of the reducing elbow (5). The supporting ring (18) is integrally formed with the reducing elbow (5), and the outer diameter of the supporting ring (18) is larger than the diameter of the reducing elbow (5).

7. The needle valve hot runner structure with a quick-release valve needle according to claim 6, characterized in that, The supporting ring (18) has a semi-open slot (19).

8. The needle valve hot runner structure with a quick-release valve needle according to claim 1, characterized in that, The piston cylinder liner (3) is provided with a piston cylinder cover (20) at the top. The piston cylinder cover (20) is provided with a third sealing ring (21). The press plate (1) has an air inlet (22) that cooperates with the piston (4). The air inlet (22) is provided with a pressure sensing valve.

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