Precise injection mold for multi-cavity needle valve

Abstract

The utility model discloses a multi-cavity needle valve precision injection mold which comprises a left mold base and a right mold base, a plurality of inner forming rods which are distributed in a matrix shape and horizontally extend rightwards are installed on the left mold base, a push plate is arranged on the right side of the left mold base, a stripper plate is installed on the push plate, and degerming guide rods extending rightwards are installed on the front portion and the rear portion of the left mold base respectively. Semicircular stripping cavities which are arranged in pairs are mounted on the stripping plate; a fixed cavity opposite to the inner forming rod is formed in the right mold base, and a material injection opening is formed in the rightmost end of the fixed cavity; a left clamping plate, a base plate and a right clamping plate are sequentially arranged on the right mold base rightwards, mounting grooves which are provided with opposite openings and used for mounting hot runner devices are formed between the left clamping plate and the right clamping plate, and the hot runner devices correspond to the fixing cavities one to one. According to the utility model, the automatic batch production of small-size products is realized, the mold closing, feeding, forming, demolding and stripping are automatically and quickly realized, the whole injection molding production process is quick and efficient, the automation degree is high, the production precision is high, and more energy is saved.

Description

Technical Field

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

[0002] Injection molds used to produce plastic products generally adopt a simple combined cavity structure and a needle valve hot runner for feeding. However, for some smaller plastic products such as PET or PP, in order to improve production efficiency and consider energy saving, batch production is required, that is, multi-cavity injection molds are used. The cavity structure of the existing mold can only produce products with simple structure, with fewer cavities in the same mold and a long demoulding time. In addition, the 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 plastic products such as PET or PP, it is necessary to design a more reasonable cavity structure, stripping structure and hot runner structure to meet the requirements of rapid installation, feeding, automatic molding and stripping, so as to make the entire injection molding production process fast, efficient and energy-saving. Utility Model Content

[0003] The utility model aims to solve the above problems and provide a multi-cavity needle valve precision injection mold, which can meet the requirements of rapid installation, feeding, automatic molding and stripping, so that the entire injection molding production process is fast, efficient and energy-saving with a high degree of automation.

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

[0005] A multi-cavity needle valve precision injection mold, comprising a left mold base capable of horizontal movement on the left side and a right mold base fixed on the right side, the left mold base is provided with a plurality of inner molding rods distributed in a matrix shape and extending horizontally to the right, the right side of the left mold base is provided with a push plate that moves left and right relative to the left mold base, the push plate is provided with a stripping plate, and the stripping plate is installed on a horizontal track that moves in the front and rear directions of the push plate; the front and rear parts of the left mold base are respectively provided with stripping guide rods extending to the right, the stripping guide rods are provided with a track groove extending outward on the right side; the outer side of the stripping plate is provided with a stripping plate extending to the left and right sides. The track plate extends outward, and the sliding end of the track plate is located in the track groove; the stripping plate is equipped with a pair of semi-annular stripping cavities; the right mold base is provided with a fixed cavity which opens to the left and is opposite to the inner forming rod, and a cooling device is provided around the fixed cavity in the right mold base, and a filling port for feeding is provided at the rightmost end of the fixed cavity; when the left mold base is pressed against the right mold base, an inner forming rod, a fixed cavity and two stripping cavities form a closed mold cavity for product molding, wherein the stripping cavity is located in the inner forming rod. The periphery of the middle section of the mold rod is connected to the inner molding rod and the fixed cavity; the inner surface of the stripping cavity is provided with a plurality of inner grooves corresponding to the shape of the product; when the track plate moves right along the track groove under the push of the push plate, the stripping plate drives the stripping cavity to separate in the front-to-back direction; the right mold base is provided with a left clamping plate, a pad plate and a right clamping plate in sequence to the right, and an installation groove for installing a hot runner device is provided between the left clamping plate and the right clamping plate, and the hot runner device corresponds to the fixed cavity one by one, and the runner device includes a runner cavity body that is thick in the middle and thin at both ends, and the runner cavity The bold middle part of the body is embedded in the mounting grooves of the left clamping plate and the right clamping plate; 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 docks with the injection port; the right half of the flow channel cavity passes through the right clamping plate and extends to one side of the control cylinder of the valve needle, and the valve needle penetrates the inside of the flow channel cavity from right to left and controls the feeding of the injection port; a storage cavity for storing melted plastic is provided in the flow channel cavity on the left side of the feed channel; a heating device is provided around the storage cavity.

[0006] Furthermore, the inner forming rod comprises an inner cylindrical rod and a rod sleeve sleeved on the cylindrical rod, and there is a cavity between the cylindrical rod and the rod sleeve to facilitate heat dissipation and cooling and forming.

[0007] Furthermore, a step-shaped connecting portion is provided between the inner molding rod, the fixed cavity and the stripping cavity.

[0008] Furthermore, the exterior of the stripping cavity is an arc surface structure with a large outer diameter in the middle and gradually decreasing outer diameters toward the left and right ends, which facilitates the push plate and the fixed cavity to press the stripping cavity from the outside.

[0009] Furthermore, a conical docking portion is provided between the material storage cavity and the material injection port.

[0010] Furthermore, a heat insulating sleeve for heat insulation is provided between the injection port and the left end surface of the flow channel cavity.

[0011] 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.

[0012] Furthermore, a limiting groove is provided on the right side of the right clamping plate, and a limiting buffer block is embedded in the limiting groove for controlling the valve needle to move leftward to play a limiting and buffering role.

[0013] The beneficial effects of the utility model are as follows: the multi-cavity needle valve precision injection mold designed by the utility model is designed with an inner molding rod, a fixed cavity, a stripping cavity and a hot runner device according to the product characteristics, so as to realize the automatic batch production of small-sized products, and automatically and quickly close the mold, feed, form, strip and strip. The injection mold has high structural precision, and the hot runner device can be quickly installed between the left clamping plate and the right clamping plate, and is also convenient for disassembly and maintenance; a storage cavity is set 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 pipeline cost and reducing the heat loss around the feed pipe. The storage cavity can continue to keep the feed of the feed channel when the valve needle closes the discharge pipe, and quickly and fully inject the melted plastic when the valve needle opens the discharge pipe; the limit buffer block can control the stroke of the valve needle and the valve needle will not be closed too fast to cause the problem of residual material bubbling at the outlet. The entire injection molding production process is fast and efficient, with a high degree of automation, high production precision, and more energy-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is an overall cross-sectional view of the utility model.

[0015] Figure 2 for Figure 1 Enlarged view of the middle left half.

[0016] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0017] Figure 4 for Figure 1 Enlarged view of the middle right half.

[0018] In the figure, 1, left mold base, 2, right mold base, 3, stripping cavity, 4, hot runner device, 11, inner molding rod, 12, push plate, 13, stripping plate, 14, track plate, 15, embryo stripping guide rod, 21, fixed cavity, 22, injection port, 23, cooling device, 24, left clamping plate, 25, pad, 26, right clamping plate, 31, inner groove, 41, runner cavity, 42, storage cavity, 43, feed channel, 44, valve needle, 45, heating device, 46, insulation sleeve, 47, limit groove, 48, limit buffer block, 151, track groove. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with specific examples and accompanying drawings.

[0020] like Figure 1-Figure 4As shown, a multi-cavity needle valve precision injection mold comprises a left mold base 1 which can move horizontally on the left side and a right mold base 2 which is fixed on the right side, wherein the left mold base 1 is provided with 8 inner molding rods 11 (divided into 4 layers in the up and down direction, 2 rods in each layer) which are distributed in a matrix shape and extend horizontally to the right, and the right side of the left mold base 1 is provided with a push plate 12 which moves left and right relative to the left mold base 1, and the push plate 12 is provided with a stripping plate 13, and the stripping plate 13 is installed on a horizontal track which moves in the front and back directions of the push plate 12; the front and rear parts of the left mold base 1 are respectively provided with stripping guide rods 15 which extend to the right, and the stripping guide rods 15 are provided with a track groove 151 which extends outward on the right side; a track plate 14 which extends outward is installed on the outer side of the stripping plate 13, and the sliding end of the track plate 14 is located in the track groove 151; the stripping plate 13 is provided with semi-annular stripping guide rods which are arranged in pairs A stripping cavity 3; a fixed cavity 21 which is open to the left and opposite to the inner forming rod 11 is provided on the right mold base 2, a cooling device 23 is provided around the fixed cavity 21 in the right mold base 2, and a filling port 22 for feeding is provided at the rightmost end of the fixed cavity 21; when the left mold base 1 is pressed against the right mold base 2, an inner forming rod 11, a fixed cavity 21 and two stripping cavities 3 form a closed mold cavity for product molding, wherein the stripping cavity 3 is located at the periphery of the middle section of the inner forming rod 11 and connects the inner forming rod 11 and the fixed cavity 21; a step-shaped connecting part is provided between the inner forming rod 11, the fixed cavity 21 and the stripping cavity 3, and the outer part of the stripping cavity 3 is an arc surface structure with a large outer diameter in the middle and an outer diameter gradually decreasing toward the left and right ends, so that the push plate 12 and the fixed cavity 21 can press the stripping cavity 3 from the outside. The inner surface of the stripping cavity 3 is provided with a plurality of inner grooves 31 corresponding to the shape of the product; when the track plate 14 moves rightward along the track groove 151 under the push of the push plate 12, the stripping plate 13 drives the stripping cavity 3 to separate in the front-to-back direction. The inner forming rod 11 includes an inner cylindrical rod and a rod sleeve sleeved on the cylindrical rod, and there is a cavity between the cylindrical rod and the rod sleeve for heat dissipation and cooling molding.The right mold base 2 is provided with a left clamping plate 24, a pad 25 and a right clamping plate 26 in sequence to the right, and a mounting groove for mounting a hot runner device 4 with openings facing each other is provided between the left clamping plate 24 and the right clamping plate 26. The hot runner device 4 corresponds to the fixed cavity 21 one by one, and the runner device 4 includes a runner cavity 41 with a thick middle and thin ends. The middle thick part of the runner cavity 41 is embedded in the mounting grooves of the left clamping plate 24 and the right clamping plate 26; the gap between the pads 25 is connected to the feed channel 43 of the runner cavity 41 through a feed pipe; the left half of the runner cavity 41 passes through the left clamping plate The plate 24 is connected to the injection port 22, and an insulation sleeve 46 for heat insulation is provided between the injection port 22 and the left end face of the flow channel cavity 41; the right half of the flow channel cavity 41 extends through the right clamping plate 26 to the control cylinder side of the valve needle 44, and the valve needle 44 runs through the flow channel cavity 41 from right to left and controls the feeding of the injection port 22; a storage cavity 42 for storing melted plastic is provided on the left side of the feed channel 43 in the flow channel cavity 41; a heating device 45 is provided on the periphery of the storage cavity 42; a conical docking portion is provided between the storage cavity 42 and the injection port 22. A limiting groove 47 is provided on the right side of the right clamping plate 26, and a limiting buffer block 48 for controlling the valve needle 44 to move to the left is embedded in the limiting groove 47; the limiting groove 47 is a T-shaped groove, and a screw hole for fixing is provided on the groove, and the limiting buffer block 48 is fixed by screws. A valve needle bushing is provided on the right side of the flow channel cavity 41 to prevent melted plastic from flowing out of the valve needle 44 .

[0021] An elastic buckle is provided on the outer edge of the middle bold part of the flow channel cavity 41 to facilitate quick installation and removal.

[0022] The multi-cavity needle valve precision injection mold designed by the utility model, when used, the injection mold works in the following process when processing test tube products: Figure 1In the state shown, the left mold base 1 is pressed against the right mold base 2 fixed on the right side, and the inner molding rod 11, the fixed cavity 21 and the two stripping cavities 3 form a closed mold cavity for product molding, wherein the stripping cavity 3 is located at the periphery of the middle section of the inner molding rod 11 and connects the inner molding rod 11 and the fixed cavity 21; a step-shaped connecting part is provided between the inner molding rod 11, the fixed cavity 21 and the stripping cavity 3 to facilitate pressing to form a closed molding cavity, the inner molding rod 11 is used for molding the inner surface of the product, and the fixed cavity 21 and the stripping cavity 3 are used for molding the outer surface of the product. The liquid plastic passes through the hot runner device 4 and enters the fixed cavity 21 from the injection port 22. After the cooling device 23 cools and molds the fixed cavity 21, the left mold base 1 drives the inner molding rod 11, the push plate 12, the stripping plate 13 and the stripping cavity 3 to move to the left as a whole and separate from the fixed cavity 21. Since the inner surface of the stripping cavity 3 is provided with an inner groove 31 corresponding to the shape of the product, the product is attached to the inner molding rod 11 and separated together. During the separation process, the product is further cooled. Then, the left mold base 1 stops moving, the push plate 12 moves to the right, and the track plate 14 moves to the right along the track groove 151 under the push of the push plate 12. The stripping plate 13 drives the stripping cavity 3 to separate in the front and rear directions while moving to the right. The product is pushed out from the inner molding rod 11 and falls off. The left mold base 1 produced 8 products synchronously in batches at one time. After that, the push plate 12 moves back to the left and is close to the left mold base 1. The track plate 14 moves left along the track groove 151 driven by the push plate 12, and the stripping plate 13 drives the stripping cavity 3 to move left and hold it in the front and back directions. After that, the left mold base 1 moves to the right side of the fixed right mold base 2 and returns to the right side again. Figure 1The process of hot runner device 4 injecting material from injection port 22 is as follows: valve needle 44 is located on the right side first, injection port 22 is in an open state, and the melted plastic entering from feed channel 43 enters storage cavity 42 and flows from injection port 22 to fixed cavity 21 of right mold base 2 under pressure. After the fixed cavity 21 is filled with hot melted plastic and cooled to form, the valve needle 44 moves to the left to close the injection port 22. At this time, the storage chamber 42 is not full of melted plastic. During injection molding, the storage chamber 42 can continue to replenish the melted plastic. The existence of the storage chamber 42 can produce the following effects: 1. Due to the processing of smaller PET or PP products, it is necessary to install a large number of hot runner devices 4 in batches between the left clamping plate 24 and the right clamping plate 26. The storage chamber 42 can reduce the inner diameter of the feed pipe connected to the feed channel 43, making it easier to lay the feed pipe, while also saving pipeline costs and reducing heat loss relative to large-diameter pipelines; 2. The storage chamber 42 can continue to keep the feed channel 43 fed when the valve needle 44 closes the injection port 22, and quickly and fully inject the melted plastic when the valve needle 44 opens the injection port 22. The limit buffer block 48 can control the stroke of the valve needle 44 and the valve needle 44 will not close the injection port 22 too fast to cause the problem of residual material bubbling at the closed position of the injection port 22. After the fixed cavity 21 of the right mold base 2 is formed and the closed molding cavity is formed again, the valve needle 44 opens the injection port 22 to feed the material and enters the next production cycle, which is repeated.

[0023] The installation process of the hot runner device 4 is as follows: install multiple runner cavities 41 into the mounting groove of the right clamp plate 26, then connect the feed channel 43 of the runner cavity 41 to the feed pipe, and then install it, then install the pad 25 on the right clamp plate 26, and then cover the left clamp plate 24, use the mounting groove of the left clamp plate 24 and the mounting groove of the right clamp plate 26 to fix the runner cavity 41, then install the right mold base 2, and finally insert the valve needle 44 on the right side of the right clamp plate 26, and connect the valve needle 44 to the driving cylinder. The structure of this hot runner device 4 can enable the hot runner device 4 to be quickly installed in batches between the left clamp plate 24 and the right clamp plate 26, and is also convenient for disassembly and maintenance.

[0024] 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 principle of the present invention shall be equivalent replacement modes and shall be included in the protection scope of the present invention.

Claims

1. A multi-cavity needle valve precision injection mold, comprising a left mold base that can move horizontally on the left side and a right mold base that is fixed on the right side, characterized in that: The left mold base is provided with a plurality of inner forming rods which are distributed in a matrix and extend horizontally to the right. The right side of the left mold base is provided with a push plate which moves left and right relative to the left mold base. The push plate is provided with a stripping plate which is installed on a horizontal track which moves in the front-rear direction of the push plate. The front and rear parts of the left mold base are respectively provided with stripping guide rods which extend to the right. The stripping guide rods are provided with a track groove which extends outward to the right. A track plate which extends outward is installed on the outer side of the stripping plate. The sliding end of the track plate is located in the track groove. The material plate is provided with a pair of semi-annular stripping cavities; the right mold base is provided with a fixed cavity which is open to the left and opposite to the inner forming rod; a cooling device is provided in the right mold base around the fixed cavity; the rightmost end of the fixed cavity is provided with a filling port for feeding; when the left mold base is pressed against the right mold base, an inner forming rod, a fixed cavity and two stripping cavities form a closed mold cavity for product molding, wherein the stripping cavity is located on the periphery of the middle section of the inner forming rod and connects the inner forming rod and the fixed cavity ; The inner surface of the stripping cavity is provided with a plurality of inner grooves corresponding to the shape of the product; when the track plate moves rightward along the track groove under the push of the push plate, the stripping plate drives the stripping cavity to separate in the front-to-back direction; the right mold base is provided with a left clamping plate, a pad plate and a right clamping plate in sequence to the right, and an installation groove for installing a hot runner device is provided between the left clamping plate and the right clamping plate, and the hot runner device corresponds to the fixed cavity one by one, and the runner device includes a runner cavity with a thick middle and thin ends, and the middle bold part of the runner cavity is embedded The left clamping plate and the right clamping plate are in the installation grooves; 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 docks with the injection port; the right half of the flow channel cavity passes through the right clamping plate and extends to the side of the control cylinder of the valve needle, and the valve needle penetrates the inside of the flow channel cavity from right to left and controls the feeding of the injection port; a storage cavity for storing melted plastic is provided on the left side of the feed channel in the flow channel cavity; a heating device is provided on the periphery of the storage cavity.

2. The multi-cavity needle valve precision injection mold according to claim 1, characterized in that: The inner molded rod comprises an inner cylindrical rod and a rod sleeve sleeved on the cylindrical rod, and a cavity is present between the cylindrical rod and the rod sleeve.

3. The multi-cavity needle valve precision injection mold according to claim 1, characterized in that: A step-shaped connecting portion is provided between the inner forming rod, the fixed cavity and the stripping cavity.

4. The multi-cavity needle valve precision injection mold according to claim 1, characterized in that: The exterior of the stripping cavity is a curved surface structure with a large outer diameter in the middle and gradually decreasing outer diameters toward the left and right ends.

5. The multi-cavity needle valve precision injection mold according to claim 1, characterized in that: A conical butt joint is provided between the material storage cavity and the material injection port.

6. The multi-cavity needle valve precision injection mold according to claim 1, characterized in that: A heat insulating sleeve for heat insulation is arranged between the injection port and the left end surface of the flow channel cavity.

7. The 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.

8. The multi-cavity needle valve precision injection mold according to claim 1, characterized in that: A limiting groove is arranged on the right side of the right clamping plate, and a limiting buffer block is embedded in the limiting groove for controlling the valve needle to move leftward to play a limiting and buffering role.

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