Air cylinder capable of adjusting height of valve needle

Abstract

The utility model relates to an air cylinder capable of adjusting the height of a valve needle in the field of hot runners, which comprises a cylinder body, the valve needle and a piston, the cylinder body is mounted in an upper template of an injection molding film, an air cylinder groove and a positioning groove are arranged in the upper template, the cylinder body is inserted into the air cylinder groove, the positioning groove is arranged at the edge of the air cylinder groove, and an air cylinder cover is arranged in the positioning groove. The cylinder cover is fixed in the positioning groove through a bolt, the bottom face of the cylinder cover tightly presses one end of the cylinder body and covers one end of the cylinder body, a needle valve hole and a through hole are formed in the piston, the through hole and the needle valve hole are coaxial and communicated, the needle tail portion of the valve needle is arranged in the needle valve hole, the needle rod portion of the valve needle penetrates through the through hole, and a pressing block is arranged at the end, away from the through hole, of the needle valve hole. A plurality of gaskets are arranged between the needle tail part of the valve needle and the bottom surface of the needle valve hole as well as between the needle tail part of the valve needle and the pressing block, so that the height of the valve needle can be accurately adjusted by taking down the pressing block and simply increasing or reducing the number of the gaskets according to actual requirements in the debugging process, and the perfect matching of the valve needle and the pouring gate is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to hot runner field especially adjustable valve needle height's air cylinder. BACKGROUND

[0002] Needle valve hot runner is a kind of technology commonly used in modern injection mold, it controls the flow of plastic melt by the opening and closing of needle valve, to realize accurate injection molding. In needle valve hot runner system, air cylinder is one of the key components to drive needle valve movement, it is connected with the control system of injection molding machine, receives instruction and drives needle valve to carry out fast and accurate action.

[0003] In needle valve hot runner system, air cylinder is usually installed in the upper die plate of injection mold, and the movement of valve needle is driven by the sliding of piston. As the key component to control the flow of plastic melt, the accurate adjustment of the height of valve needle is crucial to ensure the quality of injection.

[0004] In the application of needle valve hot runner system, due to the error of die plate thickness and the accumulated tolerance of multiple die plates, the valve needle and the gate cannot be well matched after installation. If the die plate is too thick, the valve needle cannot be sealed in place, and a circle of burr is generated. If the die plate is too thin, the valve needle will be too close to the gate, and the valve needle and the gate bushing are easy to wear after long-term use. The existing air cylinder cannot quickly adjust the valve needle and the gate to perfect match in the use site, and the air cylinder needs to be found relevant machining equipment to carry out secondary processing, which is low in efficiency and complicated in operation. The secondary processing of air cylinder on machine can only be adjusted forward, cannot be moved backward, and has limitations. The adjusted data is not intuitive. UTILITY MODEL CONTENTS

[0005] In order to overcome the deficiencies of prior art, the utility model provides air cylinder with adjustable valve needle height, which can effectively solve the technical problem of complex valve needle adjustment.

[0006] The technical scheme adopted by the utility model to solve its technical problems is:

[0007] The adjustable valve needle height cylinder comprises a cylinder body, a valve needle and a piston, the cylinder body is installed in an upper mold plate of an injection film, the piston is slidingly arranged in the cylinder body, the valve needle is connected with the piston and extends out of the cylinder body, a cylinder groove and a positioning groove are arranged in the upper mold plate, the cylinder body is inserted into the cylinder groove, the positioning groove is arranged at the edge of the cylinder groove, a cylinder cover is arranged in the positioning groove, the cylinder cover is fixed in the positioning groove through bolts, the bottom surface of the cylinder cover presses one end of the cylinder body and covers the one end of the cylinder body, a needle valve hole and a through hole are arranged in the piston, the through hole and the needle valve hole are coaxial and communicate with each other, the diameter of the through hole is smaller than that of the needle valve hole, the needle tail of the valve needle is arranged in the needle valve hole, the needle stem of the valve needle passes through the through hole, and a pressing block is arranged at the end of the needle valve hole away from the through hole, a plurality of gaskets are arranged between the needle tail of the valve needle and the bottom surface of the needle valve hole and the pressing block.

[0008] Further, the upper screw cap part and the threaded part of the pressing block, the side wall of the needle valve hole is provided with an internal thread, the threaded part is threadedly connected with the needle valve hole, the cross section of the screw cap part is a regular hexagon, and the diameter of the screw cap part is larger than that of the threaded part.

[0009] Further, the cylinder body is provided with an air hole, an air channel is arranged between the surface of the cylinder body and the inner wall of the upper mold plate, the upper mold plate is provided with an air pipe, the air pipe communicates with the air channel, and the air channel communicates with the inside of the cylinder body through the air hole.

[0010] Further, the through hole is larger than the needle stem of the valve needle and smaller than the needle tail of the valve needle, the diameter of the needle valve hole is larger than that of the needle tail of the valve needle, and there are adjusting gaps between the valve needle and the side wall of the through hole and the needle valve hole.

[0011] Further, the side wall of the piston is provided with a sealing groove, an elastic sealing ring and an elastic sealing ring are arranged in the sealing groove, and the elastic sealing ring is arranged on the inner side of the elastic sealing ring.

[0012] Further, the side walls of the cylinder body and the cylinder cover and the inner wall of the cylinder groove are all provided with sealing gaskets, two sealing gaskets seal two ends of the cylinder groove of the cylinder body respectively, and a sealing gasket is also arranged between the piston and the pressing block.

[0013] Compared with the prior art, the beneficial effects of the utility model are that the needle valve hole and the through hole are arranged in the piston, the needle tail of the valve needle is arranged in the needle valve hole, and the plurality of gaskets are arranged between the needle tail of the valve needle and the bottom surface of the needle valve hole and the pressing block, so that the height of the valve needle is conveniently adjusted. During debugging, the height of the valve needle can be accurately adjusted by simply increasing or reducing the number of gaskets according to actual needs, so that the valve needle and the sprue are perfectly matched, and the height of the valve needle after adjustment can be determined by the number of gaskets during debugging. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structural schematic view of the utility model.

[0015] Figure 2 This is a schematic diagram showing the connection of the piston, valve needle, and gasket in this utility model;

[0016] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0017] The numbers in the diagram are: 1-Cylinder body, 101-Air hole, 2-Valve needle, 201-Needle tail, 202-Needle rod, 3-Piston, 301-Through hole, 302-Needle valve hole, 303-Sealing groove, 4-Upper template, 401-Air pipe, 5-Cylinder head, 6-Pressure block, 601-Nut part, 602-Threaded part, 7-Gasket, 8-Elastic sealing ring, 9-Elastic sealing ring, 10-Air passage, 11-Adjusting clearance. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] The following is combined with Figures 1-3 A detailed description of the adjustable valve needle height cylinder of this utility model is provided below:

[0020] The height of the valve needle 2 can be adjusted by the cylinder, which comprises a cylinder body 1, a valve needle 2 and a piston 3, the cylinder body 1 is installed in the upper mold plate 4 of the injection film, the piston 3 is slidingly arranged in the cylinder body 1, the valve needle 2 is connected with the piston 3 and extends out of the cylinder body 1, the upper mold plate 4 is provided with a cylinder groove and a positioning groove, the cylinder body 1 is inserted into the cylinder groove, the positioning groove is arranged at the edge of the cylinder groove, a cylinder cover 5 is arranged in the positioning groove, the cylinder cover 5 is fixed in the positioning groove by bolts, the bottom surface of the cylinder cover 5 presses one end of the cylinder body 1 and covers the one end of the cylinder body 1, the piston 3 is provided with a needle valve hole 302 and a through hole 301, the through hole 301 and the needle valve hole 302 are coaxial and communicate with each other, the diameter of the through hole 301 is smaller than that of the needle valve hole 302, the needle tail part 201 of the valve needle 2 is arranged in the needle valve hole 302, the needle stem part 202 of the valve needle 2 passes through the through hole 301, the end of the needle valve hole 302 away from the through hole 301 is provided with a pressing block 6, a plurality of gaskets 7 are arranged between the needle tail part 201 of the valve needle 2 and the bottom surface of the needle valve hole 302 and the pressing block 6, the thickness of each gasket 7 is 0.1mm, the side wall of the piston 3 is provided with a sealing groove 303, an elastic sealing ring 8 and an elastic sealing ring 9 are arranged in the sealing groove 303, the elastic sealing ring 8 is arranged on the inner side of the elastic sealing ring 9. The side walls of the cylinder body 1 and the cylinder cover 5 and the inner wall of the cylinder groove are all provided with sealing pads, two sealing pads seal the two ends of the cylinder groove of the cylinder body 1 respectively, and a sealing pad is also arranged between the piston 3 and the pressing block 6.

[0021] The needle valve hole 302 and the through hole 301 are arranged in the piston 3, the needle tail part 201 of the valve needle 2 is arranged in the needle valve hole 302, and the height of the valve needle 2 is adjusted by the plurality of gaskets 7 arranged between the needle tail part 201 of the valve needle 2 and the bottom surface of the needle valve hole 302 and the pressing block 6, so that the height of the valve needle 2 can be conveniently adjusted. During debugging, the pressing block 6 can be removed according to actual needs, and the height of the valve needle 2 can be accurately adjusted by simply increasing or decreasing the number of gaskets 7, so as to ensure the perfect cooperation between the valve needle 2 and the gate, and the height of the valve needle 2 after adjustment can be determined by the number of gaskets 7 during debugging.

[0022] The screw cap part 601 and the threaded part 602 are arranged on the pressing block 6, the side wall of the needle valve hole 302 is provided with an internal thread, the threaded part 602 is threadedly connected with the needle valve hole 302, so that the pressing block 6 can be stably installed and conveniently disassembled. The cross section of the screw cap part 601 is a regular hexagon, and the diameter of the screw cap part 601 is larger than that of the threaded part 602. The regular hexagonal cross section of the screw cap part 601 not only facilitates the rotation operation by using a wrench or the like, but also improves the reliability and stability of the connection of the pressing block 6. This design makes it more convenient to remove the pressing block 6 when adjusting the height of the valve needle 2

[0023] The cylinder 1 is provided with an air hole 101, and an air channel 10 is arranged between the surface of the cylinder 1 and the inner wall of the upper die plate 4. The upper die plate 4 is provided with an air pipe 401, which is communicated with the air channel 10. The air channel 10 is communicated with the inside of the cylinder 1 through the air hole 101, so that the inside of the cylinder is conveniently connected with the external air source. Not only is it convenient to inflate and deflate the cylinder, but also the movement of the cylinder is more flexible and controllable.

[0024] The through hole 301 is larger than the needle stem 202 of the valve needle 2 and smaller than the needle tail 201 of the valve needle 2, the diameter of the needle valve hole 302 is larger than the needle tail 201 of the valve needle 2, and there is an adjusting gap 11 between the valve needle 2 and the side wall of the through hole 301 and the needle valve hole 302, so that the stable sliding and accurate adjustment of the valve needle 2 in the piston 3 are realized. The design that the through hole 301 is larger than the needle stem 202 of the valve needle 2 and smaller than the needle tail 201 of the valve needle 2 reduces the coaxiality requirement between the cylinder and the gate of the mold core, makes the production and processing of the mold simpler, ensures the perfect cooperation between the valve needle 2 and the gate in the injection molding process, and avoids the valve needle 2 from being stuck in the gate of the mold core.

[0025] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims.

Claims

1. A cylinder with adjustable valve needle height, comprising a cylinder body, a valve needle and a piston, the cylinder body is installed in the upper mold plate of the injection molding film, the piston is slidingly arranged in the cylinder body, the valve needle is connected with the piston and extends out of the cylinder body, characterized in that: The upper die plate is provided with a cylinder groove and a positioning groove, the cylinder body is inserted into the cylinder groove, the positioning groove is arranged at the edge of the cylinder groove, the cylinder cover is arranged in the positioning groove, the cylinder cover is fixed in the positioning groove through bolts, the bottom surface of the cylinder cover presses one end of the cylinder body, and the one end of the cylinder body is covered, the needle valve hole and the through hole are coaxial and communicated, the diameter of the through hole is smaller than that of the needle valve hole, the needle tail of the valve needle is arranged in the needle valve hole, the needle stem of the valve needle passes through the through hole, the end of the needle valve hole away from the through hole is provided with a pressing block, and a plurality of gaskets are arranged between the needle tail of the valve needle and the bottom surface of the needle valve hole and the pressing block.

2. The adjustable needle height cylinder of claim 1, wherein: The pressing block is provided with a nut part and a threaded part, the side wall of the needle valve hole is provided with an internal thread, the threaded part is threadedly connected with the needle valve hole, the cross section of the nut part is a regular hexagon, and the diameter of the nut part is larger than that of the threaded part.

3. The adjustable needle height valve cylinder of claim 1, wherein: The cylinder body is provided with an air hole, an air channel is arranged between the surface of the cylinder body and the inner wall of the upper die plate, the upper die plate is provided with an air pipe, the air pipe is communicated with the air channel, and the air channel is communicated with the cylinder body through the air hole.

4. The adjustable needle height cylinder of any of claims 1-3, wherein: The through hole is larger than the needle stem of the valve needle and smaller than the needle tail of the valve needle, the diameter of the needle valve hole is larger than that of the needle tail of the valve needle, and there are adjusting gaps between the valve needle and the side wall of the through hole and the needle valve hole.

5. The adjustable needle height cylinder of any of claims 1-3, wherein: The side wall of the piston is provided with a sealing groove, an elastic sealing ring and an elastic sealing ring are arranged in the sealing groove, and the elastic sealing ring is arranged on the inner side of the elastic sealing ring.

6. The adjustable needle height cylinder of any of claims 1-3, wherein: Sealing gaskets are arranged between the side walls of the cylinder body and the cylinder cover and the inner wall of the cylinder groove, two sealing gaskets seal two ends of the cylinder groove of the cylinder body respectively, and a sealing gasket is arranged between the piston and the pressing block.

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