Needle valve hot runner structure with valve needle capable of being rapidly disassembled and assembled

Abstract

The invention 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 rapidly disassembled and assembled. The hydraulic press comprises a press plate and a splitter plate, and a piston cylinder sleeve is arranged in the press plate. After long-time production, when plastic powder in the cavity of the hot runner system needs to be cleaned, the powder can be cleaned only by directly opening the press plate 1, exposing the piston cylinder sleeve 3 and the detachable fixing structure 8 to fix and detach the press plate 1 and the splitter plate 2, the splitter plate does not need to be heated during maintenance and cleaning, and the maintenance cost is reduced. According to the structure, cavities do not need to be dug in a press plate, the cavity digging distance does not need to be considered, product arrangement is more compact, the overall size of a mold is reduced, the weight of the mold is reduced, production energy consumption is reduced, steel material cost is saved, meanwhile, in the maintenance process, valve needle pieces of corresponding cavities can be independently and specifically replaced, and the maintenance efficiency is improved. Replacement is convenient and fast.

Description

Technical Field

[0001] The invention belongs to the technical field of hot runner equipment, and relates to a needle valve hot runner structure capable of quickly disassembling and assembling a valve needle. Background Art

[0002] At present, for ordinary preform needle valve hot runner systems, there are ordinary cylinder piston structures, which have tedious workloads in disassembly and cleaning. In addition, ordinary hot runner needle valve cylinders are basically designed on the press plate. The multi-point design has higher requirements for processing accuracy, such as concentricity and position requirements. As a result, during the production process, the needle valve will move for a long time, and there will be a lot of material powder on the manifold. When cleaning, the manifold needs to be heated, and then all valve needles need to be pulled out, and then the manifold needs to be lifted to start cleaning the powder. It is difficult to clean, and the disassembly and assembly are troublesome and complicated during maintenance and replacement, and the workload is large. Therefore, it is urgent to design a needle valve hot runner structure that can quickly disassemble and assemble the valve needle to overcome the above defects.

[0003] In order to overcome the shortcomings of the prior art, people have proposed various solutions through continuous exploration. For example, a Chinese patent discloses a needle valve hot runner structure [application number: 202210162235.5], which includes a main body and a hot nozzle installed on the main body; a needle valve is provided inside the hot nozzle; a connecting piece is also provided outside the hot nozzle, and a discharge nozzle is provided inside the connecting piece; the needle valve is used to slide downward to allow the feed port provided at the end of the needle valve to pass through the discharge nozzle to achieve material conduction; at the same time, the needle valve moves upward to allow the feed port to move away from the discharge nozzle to achieve material cutting; wherein, the feed port completely penetrates the needle valve along the radial direction of the needle valve; as the needle valve moves downward, the discharge nozzle is conducted, and the end of the needle valve is fixed on the core of the product forming, and the feed nozzle feeds from both sides of the needle valve. However, this solution still has the defects of many steps, complicated disassembly and assembly, large workload and difficulty in cleaning when cleaning powder. Summary of the invention

[0004] The object of the present invention is to provide a needle valve hot runner structure capable of quickly disassembling and assembling a valve needle in view of the above-mentioned problems.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A needle valve hot runner structure with a valve needle that can be quickly disassembled and assembled, comprises a press plate and a diverter plate, the press plate is equipped with a piston cylinder sleeve, the piston cylinder sleeve is equipped with a piston, the bottom of the piston is provided with a reducing elbow, the piston is provided with a valve needle member passing through the reducing elbow, the reducing elbow passes through the diverter plate, the bottom of the reducing elbow is provided with a supporting and fixing structure, the supporting and fixing structure is abutted against the bottom of the diverter plate, the length of the valve needle member is greater than the length of the reducing elbow, a detachable fixing structure is provided between the piston cylinder sleeve and the diverter plate, the bottom of the detachable fixing structure is abutted against the diverter plate, and the top is abutted against the press plate.

[0007] In the above-mentioned needle valve hot runner structure with a valve needle that can be quickly disassembled, the removable fixed structure includes a base arranged between the piston cylinder sleeve and the diverter plate, a first sealing ring is provided at the bottom of the base, the first sealing ring is snap-fitted with the reducing elbow, a cylinder sleeve positioning portion is provided in the base, and the piston cylinder sleeve is snap-fitted with the cylinder sleeve positioning portion.

[0008] In the above-mentioned needle valve hot runner structure that can quickly disassemble and assemble the valve needle, the cylinder liner positioning portion includes a positioning ring groove arranged in the base, and the positioning ring groove is provided with a plurality of cylinder liner pressure-bearing steps distributed in a circular array along the center point of the positioning ring groove, and the cylinder liner pressure-bearing steps are integrally formed with the base.

[0009] In the above-mentioned needle valve hot runner structure that can quickly disassemble and assemble the valve needle, a plurality of disassembly and assembly side cavities distributed in a circular array along the center point of the positioning ring groove are also provided in the positioning ring groove, and the disassembly and assembly side cavities are staggered with the cylinder liner pressure-bearing step, and the depth of the disassembly and assembly side cavities is greater than the height of the cylinder liner pressure-bearing step.

[0010] In the above-mentioned needle valve hot runner structure capable of quickly disassembling and assembling the valve needle, the top of the base has an annular fixed step, a second sealing ring is sleeved on the annular fixed step, and the top of the second sealing ring abuts against the bottom of the press plate.

[0011] In the above-mentioned needle valve hot runner structure with a valve needle that can be quickly disassembled, the valve needle component includes a hot runner valve needle arranged in the piston, and the top of the hot runner valve needle extends into the piston and the lower part passes through the reducing elbow.

[0012] In the above-mentioned needle valve hot runner structure with a valve needle capable of rapid assembly and disassembly, the length of the hot runner valve needle is greater than the length of the reducing elbow, and the diameter of the hot runner valve needle is smaller than the diameter of the reducing elbow.

[0013] In the above-mentioned needle valve hot runner structure capable of quickly disassembling and assembling a valve needle, the supporting and fixing structure comprises a supporting ring arranged at the bottom of the reducing elbow, the supporting ring and the reducing elbow are integrally formed, and the outer diameter of the supporting ring is larger than the diameter of the reducing elbow.

[0014] In the above-mentioned needle valve hot runner structure capable of quickly detaching and assembling the valve needle, a semi-open groove is provided on the supporting ring.

[0015] In the above-mentioned needle valve hot runner structure that can quickly disassemble and assemble the valve needle, a piston cylinder cover is provided on the top of the piston cylinder sleeve, a third sealing ring is installed in the piston cylinder cover, and the press plate 1 has an air inlet 22 that cooperates with the piston 4, and an air pressure sensing valve is installed in the air inlet 22.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] 1. After a long period of production, when it is necessary to clean the plastic powder in the cavity of the hot runner system, the present invention only needs to directly open the press plate 1 to expose the piston cylinder sleeve 3. The detachable fixing structure 8 is used to fix the press plate 1 and the diverter plate 2. After disassembly, the powder can be cleaned. The diverter plate does not need to be heated for maintenance and cleaning. After the cleaning is completed, the parts can be reset. This structure does not require digging cavities on the press plate, and does not need to consider the cavity spacing. It is more compact in product arrangement, reduces the overall size of the mold, reduces the weight of the mold, saves production energy consumption, and saves steel material costs. At the same time, during the maintenance process, the valve needle of the corresponding cavity can be replaced individually and targeted, and the replacement is convenient and fast.

[0018] 2. The present invention changes the cleaning method, reduces the workload, and avoids possible loss of the valve needle when the valve needle is pulled out.

[0019] 3. The present invention avoids the problems of position accuracy and concentricity required for machining multi-cavity cylinder holes on the press plate. After the new structure is installed, it is fixed to the manifold plate. The piston cylinder cover only needs to be sealed with the third sealing ring. The cylinder hole on the press plate only needs to achieve the depth dimension accuracy (low diameter accuracy requirement), which reduces the difficulty and cost of machining.

[0020] 4. The press plate in the present invention has an air inlet that matches the piston. An air pressure sensing valve is added to the air inlet. The air pressure value is automatically adjusted (stopped or strengthened) at the dynamic high and low peak values ​​to ensure that the air pressure of each exhaust is balanced, the piston movement state is consistent, and the valve needle is opened and closed at the same time to ensure that the melt enters the cavity synchronously, thereby improving product quality and molding efficiency.

[0021] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0023] Figure 2 It is a structural schematic diagram of another aspect of the present invention.

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

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

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

[0027] Figure 6 It is a schematic diagram of the structure of the base.

[0028] In the figure: press plate 1, diverter plate 2, piston cylinder liner 3, piston 4, reducer 5, valve needle 6, supporting and fixing structure 7, detachable fixing structure 8, base 9, first sealing ring 10, cylinder liner positioning part 11, positioning ring groove 12, cylinder liner pressure-bearing step 13, disassembly side cavity 14, annular fixing step 15, second sealing ring 16, hot runner valve needle 17, supporting ring 18, semi-open groove 19, piston cylinder cover 20, third sealing ring 21, air intake 22. DETAILED DESCRIPTION

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

[0030] like Figure 1-6 As shown, a needle valve hot runner structure with a valve needle that can be quickly disassembled and assembled includes a press plate 1 and a diverter plate 2, wherein a piston cylinder sleeve 3 is installed in the press plate 1, a piston 4 is arranged in the piston cylinder sleeve 3, a reducing elbow 5 is arranged at the bottom of the piston 4, a valve needle member 6 passing through the reducing elbow 5 is arranged in the piston 4, the reducing elbow 5 passes through the diverter plate 2, a supporting and fixing structure 7 is arranged at the bottom of the reducing elbow 5, the supporting and fixing structure 7 is abutted against the bottom of the diverter plate 2, the length of the valve needle member 6 is greater than the length of the reducing elbow 5, a detachable fixing structure 8 is arranged between the piston cylinder sleeve 3 and the diverter plate 2, the bottom of the detachable fixing structure 8 is abutted against the diverter plate 2, and the top is abutted against the press plate 1.

[0031] In this embodiment, after a long period of production, when it is necessary to clean the plastic powder in the cavity of the hot runner system, it is only necessary to directly open the press plate 1 to expose the piston cylinder sleeve 3. The detachable fixing structure 8 is used to fix the press plate 1 and the diverter plate 2. After disassembly, the powder can be cleaned. The diverter plate does not need to be heated for maintenance and cleaning. After cleaning, the parts can be reset. This structure does not require digging cavities on the press plate and does not need to consider the cavity spacing. It is more compact in product arrangement, reduces the overall size of the mold, reduces the weight of the mold, saves production energy consumption, and saves steel costs. At the same time, during maintenance, the valve needle parts of the corresponding cavities can be replaced individually and targeted, and the replacement is convenient and fast. In terms of processing, this invention avoids the problems of position accuracy and concentricity required for processing multi-cavity cylinder holes on the press plate 1. After the new structure is installed, it is fixed to the diverter plate 2. The cylinder hole on the press plate 1 only needs the depth dimension to reach the accuracy (the diameter accuracy requirement is low), which reduces the processing difficulty and cost.

[0032] Combination Figure 1-6 As shown, the detachable fixing structure 8 includes a base 9 arranged between the piston cylinder sleeve 3 and the diverter plate 2, a first sealing ring 10 is provided at the bottom of the base 9, the first sealing ring 10 is snap-fitted with the reducer elbow 5, a cylinder sleeve positioning portion 11 is provided in the base 9, and the piston cylinder sleeve 3 is snap-fitted with the cylinder sleeve positioning portion 11.

[0033] Specifically, when in use, the base 9 is used to fix the press plate 1 and the diverter plate 2, the first sealing ring 10 abuts against the diverter plate 2, and the cylinder sleeve positioning portion 11 is used to position, clamp and fix the piston cylinder sleeve 3, while facilitating the subsequent disassembly and replacement of the piston cylinder sleeve 3.

[0034] Combination Figure 2 , Figure 6 As shown, the cylinder liner positioning portion 11 includes a positioning ring groove 12 arranged in the base 9, and a plurality of cylinder liner pressure-bearing steps 13 are arranged in the positioning ring groove 12 and distributed in a circular array along the center point of the positioning ring groove 12. The cylinder liner pressure-bearing step 13 is integrally formed with the base 9, and a plurality of disassembly and assembly side cavities 14 are also arranged in the positioning ring groove 12 and distributed in a circular 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, and the depth of the disassembly and assembly side cavity 14 is greater than the height of the cylinder liner pressure-bearing step 13.

[0035] In this embodiment, the positioning ring groove 12 and the cylinder liner pressure-bearing step 13 are used to position, clamp and fix the piston cylinder liner 3, and at the same time facilitate the subsequent disassembly and replacement of the piston cylinder liner 3. During disassembly, the disassembly side cavity 14 can facilitate the operator to disassemble and replace the piston cylinder liner 3. The depth of the disassembly side cavity 14 is greater than the height of the cylinder liner pressure-bearing step 13, ensuring that the disassembly side cavity 14 has sufficient operating space during disassembly.

[0036] Combination Figure 2 , Figure 6 As shown, the top of the base 9 is provided with an annular fixed step 15 , and a second sealing ring 16 is sleeved on the annular fixed 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 clamp and fix the second sealing ring 16, and the second sealing ring 16 can be abutted against the bottom of the press plate 1 to achieve sealing of the contact surface.

[0038] The valve needle component 6 includes 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 lower part passes 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 increase the service life of the hot runner valve needle 17 .

[0040] Combination Figure 2 As shown, the supporting and fixing structure 7 includes a supporting ring 18 arranged at the bottom of the reducing elbow 5 , the supporting ring 18 and the reducing elbow 5 are integrally formed, 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 diverter plate 2 and cooperates with the base 9 to fix the reducer elbow 5 up and down, and the fixing effect is good.

[0042] Combination Figure 1 , Figure 2 As shown, a semi-open groove 19 is provided on the supporting ring 18 .

[0043] In this embodiment, the semi-open slot 19 can facilitate the operator to adjust the angles of the support ring 18 and the reducer elbow 5 by using tools.

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

[0045] In this embodiment, 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. After the new structure is installed, it is fixed to the diverter plate 2. 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 that cooperates with the piston 4. The air inlet 22 has an air pressure sensing valve (not shown in the figure). The air pressure value is automatically adjusted (stopped or strengthened) at the dynamic high and low peak values ​​to ensure that the air pressure of each exhaust is balanced, the piston movement state is consistent, and the valve needle 6 is opened and closed at the same time to ensure that the melt enters the cavity synchronously, thereby improving product quality and molding efficiency.

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

[0047] After a long period of production, when it is necessary to clean the plastic powder in the cavity of the hot runner system, it is only necessary to directly open the press plate 1 to expose the piston cylinder sleeve 3. The base 9 is used to fix the press plate 1 and the manifold plate 2. After disassembly, the powder can be cleaned. The manifold plate does not need to be heated for maintenance and cleaning. After the cleaning is completed, the parts can be reset. This structure does not require digging cavities on the press plate, and does not need to consider the cavity spacing. It is more compact in product arrangement, reduces the overall size of the mold, reduces the weight of the mold, saves production energy consumption, and saves steel material costs. At the same time, during the maintenance process, the valve needle of the corresponding cavity can be replaced individually and targeted, and the replacement is convenient and fast.

[0048] When in use, the base 9 is used to fix the press plate 1 and the diverter plate 2, the first sealing ring 10 is in contact with the diverter plate 2, the positioning ring groove 12 and the cylinder sleeve pressure-bearing step 13 are used to position, clamp and fix the piston cylinder sleeve 3, and at the same time facilitate the subsequent disassembly and replacement of the piston cylinder sleeve 3. 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, ensuring that the disassembly side cavity 14 has sufficient operating space during disassembly.

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

[0050] The reducing elbow 5 can be used to protect the hot runner valve needle 17 and increase the service life of the hot runner valve needle 17.

[0051] During the installation process, the support ring 18 abuts against the bottom of the diverter plate 2, and cooperates with the base 9 to fix the reducer elbow 5 up and down, with a good fixing effect.

[0052] The semi-open groove 19 can facilitate the operator to adjust the angle of the support ring 18 and the reducer elbow 5 with the help of tools. 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 examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways without departing from the spirit of the present invention.

[0054] Although the terms such as press plate 1, manifold plate 2, piston cylinder liner 3, piston 4, reducer elbow 5, valve needle 6, supporting and fixing structure 7, detachable fixing structure 8, base 9, first sealing ring 10, cylinder liner positioning part 11, positioning ring groove 12, cylinder liner pressure bearing step 13, disassembly side cavity 14, annular fixing step 15, second sealing ring 16, hot runner valve needle 17, supporting ring 18, semi-open groove 19, piston cylinder cover 20, third sealing ring 21, air intake 22 are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the present invention, and interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A needle valve hot runner structure capable of quickly disassembling a valve needle, comprising a press plate (1) and a manifold plate (2), characterized in that: The press plate (1) is provided with a piston cylinder sleeve (3), a piston (4) is provided in the piston cylinder sleeve (3), a reducing elbow (5) is provided at the bottom of the piston (4), a valve needle component (6) is provided in the piston (4) and passes through the reducing elbow (5), the reducing elbow (5) passes through the diverter plate (2), a supporting and fixing structure (7) is provided at the bottom of the reducing elbow (5), the supporting and fixing structure (7) is in contact with the bottom of the diverter plate (2), the length of the valve needle component (6) is greater than the length of the reducing elbow (5), a detachable fixing structure (8) is provided between the piston cylinder sleeve (3) and the diverter plate (2), the bottom of the detachable fixing structure (8) is in contact with the diverter plate (2), and the top is in contact with the press plate (1).

2. The needle valve hot runner structure with a valve needle that can be quickly disassembled and assembled according to claim 1, characterized in that: The detachable fixing structure (8) comprises a base (9) arranged between the piston cylinder sleeve (3) and the diverter plate (2); a first sealing ring (10) is provided at the bottom of the base (9); the first sealing ring (10) is snap-fitted with the reducer elbow (5); a cylinder sleeve positioning portion (11) is provided inside the base (9); the piston cylinder sleeve (3) is snap-fitted with the cylinder sleeve positioning portion (11).

3. The needle valve hot runner structure with a valve needle that can be quickly disassembled and assembled according to claim 2, characterized in that: The cylinder liner positioning portion (11) comprises a positioning ring groove (12) arranged in the base (9), wherein the positioning ring groove (12) is provided with a plurality of cylinder liner pressure-bearing steps (13) distributed in a ring array along the center point of the positioning ring groove (12), and the cylinder liner pressure-bearing steps (13) are integrally formed with the base (9).

4. The needle valve hot runner structure with a valve needle that can be quickly disassembled and assembled according to claim 3, characterized in that: The positioning ring groove (12) is further provided with a plurality of disassembly and assembly side cavities (14) distributed in a ring array along the center point of the positioning ring groove (12); the disassembly and assembly side cavities (14) and the cylinder liner pressure-bearing step (13) are arranged alternately; and the depth of the disassembly and assembly side cavities (14) is greater than the height of the cylinder liner pressure-bearing step (13).

5. The needle valve hot runner structure with a valve needle that can be quickly disassembled and assembled according to claim 4, characterized in that: The top of the base (9) is provided with an annular fixed step (15), a second sealing ring (16) is sleeved on the annular fixed step (15), and the top of the second sealing ring (16) abuts against the bottom of the press plate (1).

6. The needle valve hot runner structure capable of quickly detaching and assembling the valve needle according to claim 5, characterized in that: The valve needle component (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 lower part passes through the reducing elbow (5).

7. The needle valve hot runner structure capable of quickly detaching and assembling the valve needle according to claim 6, 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).

8. The needle valve hot runner structure capable of quickly detaching and assembling the valve needle according to claim 7, characterized in that: The supporting and fixing structure (7) comprises a supporting ring (18) arranged at the bottom of the reducing elbow (5); the supporting ring (18) and the reducing elbow (5) are integrally formed; and the outer diameter of the supporting ring (18) is greater than the diameter of the reducing elbow (5).

9. The needle valve hot runner structure capable of quickly detaching and assembling the valve needle according to claim 8, characterized in that: The supporting ring (18) is provided with a semi-open groove (19).

10. The needle valve hot runner structure capable of quickly detaching and assembling the valve needle according to claim 1, characterized in that: A piston cylinder cover (20) is provided on the top of the piston cylinder sleeve (3), a third sealing ring (21) is installed in the piston cylinder cover (20), an air inlet (22) matching with the piston (4) is provided in the press plate (1), and an air pressure sensing valve is installed in the air inlet (22).

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