An adjustable-stroke valve needle drive cylinder and its implementation method

Abstract

This invention relates to a valve needle drive cylinder with adjustable stroke and its implementation method. The cylinder includes a barrel-shaped cylinder body, a T-shaped piston disposed within the cylinder body, a sealing plate assembly that seals the T-shaped piston within the cylinder body, a base for fixing the sealing plate assembly, and an adjustment component for adjusting the axial distance between the base and the sealing plate assembly. The sealing plate assembly has a movable hole and a valve needle hole corresponding to the T-shaped piston and the valve needle, respectively. The sealing plate assembly also has a cooling channel for coolant to pass through. The cylinder also includes a connecting bolt that axially passes through the cylinder body and the sealing plate assembly at the end of the cylinder body away from its opening and is screwed to the base. This invention allows for overall stroke adjustment of the cylinder body and the valve needle without disassembling the cylinder body through the adjustment component, which is convenient and quick.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology, and in particular to a valve needle drive cylinder with adjustable stroke and its implementation method. Background Technology

[0002] In needle valve hot runner systems, the valve needle is often driven by a cylinder or hydraulic cylinder to control the opening and closing of the gate. During the injection molding process, the valve needle length often does not reach the ideal state due to the machining accuracy of the mold and the valve needle, as well as the influence of the thermal expansion of the valve needle. When the valve needle is too long, the mold core gate is prone to bulging, flanging, or cracking. When the valve needle is too short, the product gate may have burrs or the gate may not close completely, affecting product quality. Therefore, when the valve needle length changes, it is necessary to adjust the valve needle length or replace the valve needle in time.

[0003] However, since existing valve needles are installed inside the driving oil / pneumatic cylinder, adjustments require either opening the sealing plate assembly for adjustment, as disclosed in the technical solution of patent number CN201610637695.3, or modifying the cylinder body and piston by opening an adjustment hole at the upper end of the cylinder body and using a special piston (usually a cross piston) adapted to the adjustment hole, allowing the valve needle to be adjusted by directly inserting a tool into the adjustment hole, as disclosed in the technical solution of patent number CN201721072152.8. Of these two methods, the former requires disassembling the oil / pneumatic cylinder, making the adjustment process more complicated, while the latter has a complex structure, resulting in higher maintenance costs. Moreover, it uses a special adjustment mechanism and cannot be applied to traditional cylinder bodies. Therefore, traditional valve needles on production equipment must be completely replaced, which indirectly increases the company's equipment costs. Therefore, to avoid the shortcomings of the above two valve needle adjustment cylinders, our company has specifically proposed a stroke-adjustable valve needle driving cylinder and its implementation method. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a valve needle drive cylinder with adjustable stroke and its implementation method, which can effectively solve the above-mentioned problems.

[0005] To achieve the above requirements, the technical solution adopted by the present invention to solve its technical problem is as follows:

[0006] An adjustable-stroke valve needle drive cylinder is provided. The cylinder includes a barrel-shaped cylinder body, a T-shaped piston disposed within the cylinder body, a sealing plate assembly sealing the T-shaped piston within the cylinder body, a base for fixing the sealing plate assembly, and an adjusting assembly for adjusting the axial distance between the base and the sealing plate assembly. The T-shaped piston has a fixing position for fixing the valve needle. The adjusting assembly is disposed between the base and the sealing plate assembly. The sealing plate assembly has a movable hole and a valve needle hole corresponding to the T-shaped piston and the valve needle, respectively. The sealing plate assembly also has a cooling channel for coolant to pass through. The cylinder also includes a connecting bolt that axially passes through the cylinder body and the sealing plate assembly sequentially at the end of the cylinder body away from its opening and is screwed to the base.

[0007] The adjustable valve needle drive cylinder and its implementation method of the present invention include an adjustment component comprising a support boss fixed on the base and an adjustment ring sleeved on the support boss; the adjustment ring is threadedly connected to the support boss, and the outer side wall of the adjustment ring is provided with a plurality of adjustment grooves in the circumferential direction; when adjusted to the correct position, the adjustment ring abuts against the sealing plate assembly.

[0008] The adjustable valve needle drive cylinder and its implementation method of the present invention, wherein the support boss is annular and coaxial with the piston, and a stop pin may be provided on the support boss to prevent the adjustment ring from rotating on its own.

[0009] The adjustable-stroke valve needle drive cylinder and its implementation method of the present invention include a support platform on the base for supporting the sealing plate. The support platform is provided in a ring and is provided in multiple ways. The connecting bolt is screwed to the support platform. When assembled in place, the support boss is located between the ring structure formed by the multiple support platforms.

[0010] The adjustable-stroke valve needle drive cylinder and its implementation method of the present invention are described herein, wherein the support platform and the support boss are integrally formed with the base.

[0011] The adjustable-stroke valve needle drive cylinder and its implementation method of the present invention, wherein the sealing plate assembly includes a sealing plate body that seals the opening of the cylinder body, and a cylinder inner plug fixed in the cylinder body; the valve needle hole and the cooling channel are both provided on the sealing plate body, the movable hole is provided on the cylinder inner plug, and the longitudinal end of the T-shaped piston is slidably disposed in the movable hole.

[0012] The adjustable-stroke valve needle drive cylinder and its implementation method of the present invention are described herein, wherein the inner wall of the cylinder body is recessed and formed with a step, and the inner plug of the cylinder body is provided with a positioning boss corresponding to the step. When assembled in place, the sealing plate body presses the inner plug of the cylinder body against the step.

[0013] The adjustable-stroke valve needle drive cylinder and its implementation method of the present invention are provided in that the inner wall of the cylinder body is provided with an oil inlet and an oil outlet on both sides corresponding to the T-shaped piston, the outer wall of the cylinder body is provided with a first sealing ring assembly that cooperates with the inner wall of the cylinder body, and the inner wall of the movable hole is provided with a second sealing ring assembly that cooperates with the side wall of the T-shaped piston.

[0014] The adjustable-stroke valve needle drive cylinder and its implementation method of the present invention, wherein the T-shaped piston has an eccentrically provided slot on one end face away from the fixed position, and the inner wall of the cylinder body is provided with an anti-rotation pin adapted to the slot. When assembled in place, the anti-rotation pin is inserted into the slot.

[0015] Furthermore, a method for adjusting a valve needle drive cylinder with adjustable stroke is also provided, wherein the method includes the following steps:

[0016] Step 1: Adjust the length of the valve needle:

[0017] Adjust the distance between the sealing plate assembly and the base by adjusting the components, and tighten the connecting bolts after it is in place;

[0018] Step 2: Shorten the valve needle:

[0019] Loosen the connecting bolts, increase the distance between the sealing plate assembly and the base using the adjusting component, and then tighten the connecting bolts.

[0020] The beneficial effects of the present invention are as follows: The present invention adjusts the gap between the sealing plate assembly and the base by adjusting the component, thereby enabling the overall stroke of the cylinder and valve needle to be adjusted without disassembling the cylinder body, which is convenient and quick. Moreover, compared with the use of a dedicated adjustable drive cylinder or oil cylinder, the adjustment mechanism of the present invention is located outside the cylinder body, which will not affect the sealing performance of the cylinder body, and maintenance or replacement is more convenient. In comparison, the technical implementation difficulty and manufacturing cost are also lower. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort:

[0022] Figure 1 This is an overall structural diagram of the adjustable-stroke valve needle drive cylinder of the present invention.

[0023] Figure 2 yes Figure 1 An aerial view of the explosion.

[0024] Figure 3 hour Figure 1 An upward view of the explosion.

[0025] Figure 4 This is a longitudinal sectional view of the adjustable-stroke valve needle drive cylinder of the present invention.

[0026] Figure 5 This is a flowchart of the adjustment method for the adjustable valve needle drive cylinder of the present invention. Detailed Implementation

[0027] The terms "first," "second," "third," and "fourth," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0028] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0029] "Multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0030] Furthermore, the terms indicating orientation, such as "up," "down," "left," "right," "upper end," "lower end," and "longitudinal," are all based on the posture and position of the device or equipment described in this solution during normal use.

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0032] The preferred embodiment of the present invention uses a valve needle drive cylinder with adjustable stroke, such as... Figure 1-4 As shown, the hydraulic cylinder includes a vertically oriented, barrel-shaped cylinder body 1 with its opening facing downwards, a T-shaped piston 2 housed within the cylinder body 1, a sealing plate assembly 3 that seals the T-shaped piston 2 within the cylinder body 1, a base 4 that fixes the sealing plate assembly 3, and an adjusting assembly 5 that adjusts the axial distance between the base 4 and the sealing plate assembly 3. During installation, the base 4 is fixed to a flow divider plate, and the adjusting assembly 5 is installed on the base 4. After the piston is inserted into the cylinder body 1, it is sealed by the sealing plate assembly 3, and finally, the sealing plate assembly 3 is fixed to the base 4. Specifically, the longitudinal end face of the T-shaped piston 2 has a fixing position 6 for fixing the valve needle 200. Generally, the fixing position 6 is formed by a groove, and the valve needle 200 is engaged in the groove. The adjusting assembly 5 is located between the base 4 and the sealing plate assembly 3 to facilitate adjustment of the distance and also to ensure the overall... The cylinder is more compact in size. The sealing plate assembly 3 is provided with a movable hole 7 and a valve needle hole 8 respectively corresponding to the T-shaped piston 2 and the valve needle 200, so as to facilitate the up and down movement of the T-shaped piston and the valve needle 200. Furthermore, the sealing plate assembly 3 is also provided with a cooling channel 9 for coolant to pass through, so as to avoid the heat on the distributor plate from being transferred to the cylinder body 1 and thus reducing the performance of the sealing parts. Furthermore, the cylinder of the present invention also includes a connecting bolt 10 that axially passes through the cylinder body 1 and the sealing plate assembly 3 in sequence and is screwed to the base 4 at the end of the cylinder body 1 away from its opening. Multiple connecting bolts 10 are provided to fix the cylinder body 1 and the sealing plate assembly 3 together on the base 4. They also play a role in adjusting the rise or fall of the cylinder body 1 and the valve needle 200 in conjunction with the adjusting assembly 5. In addition, they also play a role in stabilizing the cylinder body 1 and preventing the cylinder body 1 from tilting.

[0033] The hydraulic cylinder of the present invention adjusts the gap between the sealing plate assembly 3 and the base 4 through the adjusting component 5, so that the cylinder body 1 and the valve needle 200 are moved away from or closer to the flow divider plate. This allows the overall stroke of the cylinder body 1 and the valve needle 200 to be adjusted without disassembling the cylinder body 1. This enables better sealing or opening of the gate of the mold located below the flow divider plate. The entire adjustment process is convenient and quick. Moreover, compared with the traditional use of a dedicated adjustable drive cylinder or hydraulic cylinder, the adjusting mechanism of the present invention is located outside the cylinder body 1, which will not affect the sealing performance of the cylinder body 1. Maintenance or replacement is more convenient, and the technical implementation difficulty and manufacturing cost are also lower.

[0034] Preferably, the adjusting assembly 5 includes a support boss 51 fixed on the base 4 and an adjusting ring 52 sleeved on the support boss 51; the adjusting ring 52 is threadedly connected to the support boss 51, and the outer side wall of the adjusting ring 52 is provided with a plurality of adjusting grooves 11 circumferentially. When adjusted to the correct position, the adjusting ring 52 abuts against the sealing plate assembly 3. The support boss 51 is annular and coaxial with the piston. A stop pin 12 is provided on the support boss 51 to prevent the adjusting ring 52 from rotating on its own. Specifically, one end of the stop pin 12 is inserted into the support boss 51, and the other end... One end is located in the adjustment groove. When rotation is required, the stop piece can be moved out of the adjustment groove. When the valve needle 200 needs to be closer to the mold gate, the adjustment rod 300 is inserted into the adjustment groove 11 and the adjustment rod is pushed horizontally to make the adjustment ring 52 rotate and descend. This causes the cylinder 1, valve needle 200, piston and sealing plate assembly 3 to descend synchronously and approach the gate. When the valve needle 200 needs to be moved away from the gate, the adjustment ring 52 is rotated in the opposite direction to push the sealing plate assembly 3 and cylinder 1 upward together, thereby moving the valve needle 200 away from the gate.

[0035] Preferably, the base 4 is provided with a support platform 13 for supporting the sealing plate assembly 3. Multiple support platforms 13 are provided and distributed in a ring. The connecting bolts 10 are screwed to the support platforms 13. When assembled, the support boss 51 is located between the ring structure formed by the multiple support platforms 13. The support platforms 13 and the support boss 51 are integrally cast with the base 4. Of course, they can also be integrally welded or integrally machined by lathe. The support platforms 13 can be used to support the cylinder 1 when it is lowered to the lowest position to ensure stability. Specifically, the height of the support platform 13 is less than the maximum rising height of the adjusting ring 52.

[0036] Preferably, the sealing plate assembly 3 includes a sealing plate body 31 that seals the opening of the cylinder body 1, and a cylinder inner plug 32 fixed inside the cylinder body 1; the valve needle hole 8 and the cooling channel 9 are both provided on the sealing plate body 31, the movable hole 7 is provided on the cylinder inner plug 32, and the longitudinal end of the T-shaped piston 2 is slidably provided in the movable hole 7. The cylinder inner plug 32 can further ensure the sealing of the inner cavity of the cylinder body 1 and avoid air / oil leakage.

[0037] Preferably, the inner wall of the cylinder body 1 is recessed with a step 14, and the cylinder inner plug 32 is provided with a positioning boss 15 corresponding to the step 14. When assembled, the sealing plate body 31 presses the positioning boss 15 of the cylinder inner plug 32 against the step 14. Specifically, the lower end of the cylinder inner plug 32 is flush with the lower end of the cylinder body 1. The inner wall of the cylinder body 1 is provided with an oil inlet 16 and an oil outlet 17 on both sides corresponding to the T-shaped piston 2. The sealing plate body 31 is provided with a water return nozzle 22 corresponding to the cooling channel. The outer wall of the cylinder inner plug 32 is provided with a first sealing ring assembly 18 that cooperates with the inner wall of the cylinder body 1. The inner wall of the movable hole 7 is provided with a second sealing ring assembly 19 that cooperates with the side wall of the T-shaped piston 2 to ensure sealing.

[0038] Preferably, a slot 20 is provided eccentrically on the end face of the T-shaped piston 2 away from the fixed position 6, and an anti-rotation pin 21 adapted to the slot 20 is provided on the inner wall of the cylinder body 1. When assembled, the anti-rotation pin 21 is inserted into the slot 20 to prevent the piston and valve needle 200 from rotating.

[0039] The preferred embodiment of the present invention provides an adjustment method for the stroke-adjustable valve needle 200 driving cylinder, such as... Figure 5 As shown, the method includes the following steps:

[0040] Step S10: When it is necessary to adjust the length of the valve needle:

[0041] Adjust the distance between the sealing plate assembly 3 and the base 4 by adjusting component 5, and tighten the connecting bolt 10 after it is in place;

[0042] Step S20: When it is necessary to shorten the valve needle:

[0043] Loosen the connecting bolt 10, increase the distance between the sealing plate assembly 3 and the base 4 by adjusting the assembly, and tighten the connecting bolt 10 after it is in place.

[0044] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A valve needle drive cylinder with adjustable stroke, characterized in that, The hydraulic cylinder includes a barrel-shaped cylinder body, a T-shaped piston disposed within the cylinder body, a sealing plate assembly that seals the T-shaped piston within the cylinder body, a base for fixing the sealing plate assembly, and an adjusting assembly for adjusting the axial distance between the base and the sealing plate assembly. The T-shaped piston has a fixing position for fixing a valve needle. The adjusting assembly is disposed between the base and the sealing plate assembly. The sealing plate assembly has a movable hole and a valve needle hole corresponding to the T-shaped piston and the valve needle, respectively. The sealing plate assembly also has a cooling channel for coolant to pass through. The cylinder also includes a connecting bolt that passes axially through the cylinder body and the sealing plate assembly at one end of the cylinder body away from its opening and is screwed to the base. The connecting bolt is used to fix the cylinder body and the sealing plate assembly together on the base and, in conjunction with the adjusting assembly, adjusts the rise or fall of the cylinder body and the valve needle. The adjustment assembly includes a support boss fixed on the base and an adjustment ring sleeved on the support boss; the adjustment ring is threaded to the support boss, and the outer side wall of the adjustment ring is provided with multiple adjustment grooves in the circumferential direction. When adjusted to the correct position, the adjustment ring abuts against the sealing plate assembly; an adjustment rod is inserted into the adjustment groove to facilitate horizontally pushing the adjustment ring to rotate. The support boss is annular and coaxial with the piston, and a stop pin is provided on the support boss to prevent the adjusting ring from rotating on its own. The base is provided with a support platform for supporting the sealing plate. There are multiple support platforms arranged in a ring. The connecting bolts are screwed to the support platforms. When assembled, the support boss is located between the ring structure formed by the multiple support platforms. Both the support platforms and the support boss are integrally formed with the base.

2. The adjustable-stroke valve needle drive cylinder according to claim 1, characterized in that, The sealing plate assembly includes a sealing plate body that seals the opening of the cylinder body, and a cylinder inner plug that is fixed inside the cylinder body; the valve pin hole and the cooling channel are both provided on the sealing plate body, the movable hole is provided on the cylinder inner plug, and the longitudinal end of the T-shaped piston is slidably disposed in the movable hole.

3. The adjustable-stroke valve needle drive cylinder according to claim 2, characterized in that, The inner wall of the cylinder is recessed and formed with a step. The inner plug of the cylinder is provided with a positioning boss corresponding to the step. When assembled, the sealing plate body presses the inner plug of the cylinder against the step.

4. The adjustable-stroke valve needle drive cylinder according to claim 2, characterized in that, The inner wall of the cylinder is provided with an oil inlet and an oil outlet on both sides corresponding to the T-shaped piston. The outer wall of the cylinder inner plug is provided with a first sealing ring assembly that mates with the inner wall of the cylinder. The inner wall of the movable hole is provided with a second sealing ring assembly that mates with the side wall of the T-shaped piston.

5. The adjustable-stroke valve needle drive cylinder according to claim 1, characterized in that, The T-shaped piston has an eccentrically located slot on one end face away from the fixed position. The inner wall of the cylinder is provided with an anti-rotation pin that matches the slot. When assembled, the anti-rotation pin is inserted into the slot.

6. A method for adjusting a stroke-adjustable valve needle drive cylinder, as described in any one of claims 1-5, characterized in that, The method includes the following steps: Step 1: Adjust the length of the valve needle: Adjust the distance between the sealing plate assembly and the base by adjusting the components, and tighten the connecting bolts after it is in place; Step 2: Shorten the valve needle: Loosen the connecting bolts, increase the distance between the sealing plate assembly and the base using the adjusting component, and then tighten the connecting bolts.

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