Hot runner structure for multi-cavity needle valve precise injection mold

Abstract

The utility model discloses a hot runner structure for a multi-cavity needle valve precision injection mold, which comprises a runner cavity with a thick middle part and two thin ends, the thick middle part of the runner cavity is embedded into a first mounting groove of a left clamping plate at the outer left end, and the right end of the runner cavity is embedded into a second mounting groove of a right clamping plate; base plates are arranged between the left clamping plate and the right clamping plate, and a gap between the base plates is connected to a feeding channel of the runner cavity through a conveying pipeline; the left half part of the runner cavity penetrates through the left clamping plate and abuts against a discharging pipeline which is arranged on the mold base and used for discharging to the injection molding cavity, and the right half part of the runner cavity penetrates through the right clamping plate and extends to one side of the control air cylinder of the valve needle; and a material storage cavity is arranged between the feeding channel and the discharging pipeline in the runner cavity. The runner cavities can be quickly mounted between the left clamping plate and the right clamping plate in batches, and are convenient to disassemble and maintain; and the material storage cavity is arranged in the runner cavity, so that the inner diameter of the feeding pipeline can be reduced, molten plastic can be quickly and fully injected, and the whole injection molding production process is quick, efficient and more energy-saving.

Description

Technical Field

[0001] The utility model belongs to the technical field of injection molds, and in particular relates to a hot runner structure for a multi-cavity needle valve precision injection mold. Background Art

[0002] Injection molds are used to produce plastic products, generally using needle valve hot runners for feeding. However, for some smaller PET or PP products, in order to improve production efficiency and consider energy saving, batch production needs to be achieved, that is, multi-cavity injection molds are used. The existing needle valve hot runner structure is generally designed for larger injection products. The entire hot runner system is more troublesome to fix, and the feeding time is relatively long. For the batch production of smaller PET or PP products, a more rational needle valve hot runner structure needs to be designed to meet the requirements of fast feeding and fast automatic production. In addition, the entire hot runner system is easy to install and fix quickly, making the entire injection molding production process efficient and energy-saving. Utility Model Content

[0003] The utility model aims to solve the above-mentioned problems and provide a hot runner structure for a multi-cavity needle valve precision injection mold, which can meet the requirements of fast feeding and fast automatic production, and the entire hot runner system is easy to install and fix quickly, thereby making the entire injection molding production process efficient and energy-saving.

[0004] The utility model is realized by the following technical solutions:

[0005] A hot runner structure for a multi-cavity needle valve precision injection mold, comprising a runner cavity that is thick in the middle and thin at both ends, wherein the middle thick part of the runner cavity is embedded in the first mounting groove of the left clamping plate at the outer left end, and the right end is embedded in the second mounting groove of the right clamping plate; a pad is arranged between the left clamping plate and the right clamping plate, and the gap between the pads is connected to the feed channel of the runner cavity through a feed pipeline; the left half of the runner cavity passes through the left clamping plate and abuts against a discharge pipeline on the mold base for discharging material into the injection molding cavity, and the discharge pipeline is located between the mold base and the left end surface of the runner cavity and is provided with a heat insulation The right half of the flow channel cavity extends through the right clamping plate to the side of the control cylinder of the valve needle, and the valve needle runs through the flow channel cavity from right to left and controls the feeding of the discharge pipe; a storage cavity for storing melted plastic is provided in the flow channel cavity between the feed channel and the discharge pipe; a heating device is provided on the periphery of the storage cavity; a limit groove is provided on the right side of the right clamping plate, and a limit and buffer block for controlling the valve needle to move to the left and playing a limiting and buffering role is embedded in the limit groove; a valve needle bushing for preventing the melted plastic from flowing out of the valve needle is provided on the right side of the flow channel cavity.

[0006] Furthermore, a tapered docking portion is provided between the material storage cavity and the material discharge pipe.

[0007] Furthermore, the first mounting groove and the second mounting groove are both cylindrical grooves.

[0008] Furthermore, the limiting groove is a T-shaped groove, and the groove is provided with screw holes for fixing.

[0009] Furthermore, an elastic buckle is provided on the outer edge of the middle bold portion of the flow channel cavity to facilitate quick installation and disassembly.

[0010] The beneficial effects of the utility model are as follows: the hot runner structure of the multi-cavity needle valve precision injection mold designed by the utility model, the runner cavity can be quickly installed in batches between the left clamping plate and the right clamping plate, and is also convenient for disassembly and maintenance; a storage cavity is arranged in the runner cavity, which can reduce the inner diameter of the feed pipe, making the feed pipe easy to lay, while also saving the pipe cost and reducing the heat loss around the feed pipe; the storage cavity can continue to keep the feed in the feed channel when the valve needle closes the discharge pipe, and quickly and fully inject the molten plastic when the valve needle opens the discharge pipe; the limit and buffer block can control the stroke of the valve needle and the valve needle will not close too quickly to cause the problem of residual material bubbling at the outlet; the entire injection molding production process can be fast, efficient, and more energy-efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a three-dimensional structural diagram of the utility model.

[0012] Figure 2 for Figure 1 Enlarged view of the area enclosed by the dotted line in the middle.

[0013] In the figure, 1. mold base, 2. left clamping plate, 3. pad, 4. right clamping plate, 5. flow channel cavity, 6. storage cavity, 7. feed channel, 8. valve needle, 9. heating device, 11. discharge pipe, 12. insulation sleeve, 21. first mounting groove, 41. second mounting groove, 42. limit groove, 43. limit and buffer block, 81. valve needle bushing. DETAILED DESCRIPTION

[0014] The present invention will be further described below in conjunction with specific examples and accompanying drawings.

[0015] like Figure 1 , Figure 2As shown, a hot runner structure for a multi-cavity needle valve precision injection mold includes a runner cavity 5 that is thick in the middle and thin at both ends, wherein the middle thick part of the runner cavity 5 is embedded in the first mounting groove 21 of the left clamping plate 2 at the outer left end, and is embedded in the second mounting groove 41 of the right clamping plate 4 at the right end; the first mounting groove 21 and the second mounting groove 41 are both cylindrical grooves. A pad 3 is arranged between the left clamping plate 2 and the right clamping plate 4, and the gap between the pads 3 is connected to the feed channel 7 of the runner cavity 5 through a feed pipe; the left half of the runner cavity 5 passes through the left clamping plate 2 and abuts against the discharge pipe 11 on the mold base 1 for discharging material to the injection molding cavity, and the discharge pipe 11 is located between the mold base 1 and the left end face of the runner cavity 5 and is provided with an insulating sleeve 12 for heat insulation; the right half of the runner cavity 5 passes through the right clamping plate 4 and extends to the control cylinder side of the valve needle 8, and the valve needle 8 runs through the inside of the runner cavity 5 from right to left and controls the feeding of the discharge pipe 11; a storage chamber 6 for storing melted plastic is provided in the runner cavity 5 between the feed channel 7 and the discharge pipe 11; a heating device 9 is provided on the periphery of the storage chamber 6; a conical docking portion is provided between the storage chamber 6 and the discharge pipe 11. The right side of the right clamping plate 4 is provided with a limit groove 42, and a limit and buffer block 43 is embedded in the limit groove 42 for controlling the valve needle 8 to move leftward to play a limit and buffer role; the limit groove 42 is a T-shaped groove, and a screw hole is provided on the groove for fixing, and the limit and buffer block 43 is fixed by screws. The right side of the flow channel cavity 5 is provided with a valve needle bushing 81 for preventing melted plastic from flowing out of the valve needle 8.

[0016] An elastic buckle is provided on the outer edge of the middle bold part of the flow channel cavity 5 to facilitate quick installation and disassembly.

[0017] The hot runner structure for multi-cavity needle valve precision injection mold designed by the utility model, when in use, multiple runner cavities 5 are installed into the second installation groove 41 of the right clamping plate 4, and then the feed channel 7 of the runner cavity 5 is connected to the feed pipe, and then the pad 3 is installed on the right clamping plate 4, and then the left clamping plate 2 is covered, and the runner cavity 5 is fixed by using the first installation groove 21 of the left clamping plate 2 and the second installation groove 41 of the right clamping plate 4, and then the mold base 1 is installed, and finally the valve needle 8 is inserted into the right side of the right clamping plate 4, and the valve needle 8 is connected to the driving cylinder. This structure can make the runner cavity 5 quickly installed between the left clamping plate 2 and the right clamping plate 4 in batches. After the installation is completed, the valve needle 8 is first located on the right side, and the discharge pipe 11 is in an open state. The melted plastic entering the feed channel 7 enters the storage cavity 6 and flows from the discharge pipe 11 to the molding cavity of the mold base 1 under pressure. After the molding cavity is filled with hot melted plastic and cooled, the valve needle 8 moves to the left to close the discharge pipe 11. At this time, if the storage chamber 6 is not full of melted plastic, the storage chamber 6 can continue to replenish the melted plastic during injection molding. Due to the existence of the storage chamber 6, the following effects can be produced: 1. Due to the processing of PET or PP products with smaller sizes, it is necessary to install a large number of flow channel cavities 5 in batches between the left clamping plate 2 and the right clamping plate 4. The storage chamber 6 can reduce the inner diameter of the feed pipe docking with the feed channel 7, making the feed pipe easy to lay, while also saving pipeline costs and reducing heat loss relative to large-diameter pipelines; 2. The storage chamber 6 can continue to keep the feed of the feed channel 7 when the valve needle 8 closes the discharge pipe 11, and quickly and fully inject the melted plastic when the valve needle 8 opens the discharge pipe 11. The limit and buffer block 43 can control the stroke of the valve needle 8 and the valve needle 8 will not close the discharge pipe 11 too fast to cause the problem of residual material bubbling at the closed position of the discharge pipe 11. After the molding cavity of the mold base 1 is formed and the material is removed, the valve needle 8 opens the discharge pipe 11 to feed the material, and enters the next production cycle, and repeats this process. The entire injection molding production process can be fast, efficient, and more energy-efficient.

[0018] The above embodiments are only preferred implementation modes of the present invention and are only used to explain the present invention rather than to limit the present invention. Any changes, substitutions, combinations, simplifications, modifications, etc. made by those skilled in the art without departing from the spirit and principles of the present invention shall be considered as equivalent replacement modes and shall be included in the protection scope of the present invention.

Claims

1. A hot runner structure for a multi-cavity needle valve precision injection mold, characterized in that: It comprises a flow channel cavity which is thick in the middle and thin at both ends, wherein the thick part in the middle of the flow channel cavity is embedded in the first mounting groove of the left clamping plate at the outer left end, and is embedded in the second mounting groove of the right clamping plate at the right end; a pad is arranged between the left clamping plate and the right clamping plate, and the gap between the pads is connected to the feed channel of the flow channel cavity through a feed pipe; the left half of the flow channel cavity passes through the left clamping plate and abuts against the discharge pipe on the mold base for discharging material to the injection molding cavity, and the discharge pipe is located between the mold base and the left end face of the flow channel cavity and is provided with an insulation sleeve for heat insulation; the flow channel cavity The right half of the valve needle passes through the right clamping plate and extends to the side of the control cylinder of the valve needle. The valve needle penetrates the interior of the flow channel cavity from right to left and controls the feeding of the discharge pipe. A storage chamber for storing melted plastic is provided in the flow channel cavity between the feed channel and the discharge pipe. A heating device is provided on the periphery of the storage chamber. A limit groove is provided on the right side of the right clamping plate, and a limit and buffer block for controlling the valve needle to move to the left is embedded in the limit groove. A valve needle bushing for preventing the melted plastic from flowing out of the valve needle is provided on the right side of the flow channel cavity.

2. The hot runner structure for a multi-cavity needle valve precision injection mold according to claim 1, characterized in that: A tapered butt joint is provided between the material storage cavity and the material discharge pipe.

3. The hot runner structure for a multi-cavity needle valve precision injection mold according to claim 1, characterized in that: The first mounting groove and the second mounting groove are both cylindrical grooves.

4. The hot runner structure for a multi-cavity needle valve precision injection mold according to claim 1, characterized in that: The limiting groove is a T-shaped groove, and a screw hole for fixing is arranged on the groove.

5. The hot runner structure for a multi-cavity needle valve precision injection mold according to claim 1, characterized in that: An elastic buckle is arranged on the outer edge of the middle bold part of the flow channel cavity.

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