One-mold multi-cavity injection mold for folding type working cart connecting piece

Abstract

The utility model belongs to the technical field of molds, and relates to a one-mold multi-cavity injection mold for a folding type working cart connecting piece. The connecting piece forming mold comprises a lower connecting piece forming mold and an upper connecting piece forming mold, an injection molding main plate is arranged above the upper connecting piece forming mold, two lower connecting piece forming cavities are formed in the lower connecting piece forming mold, and two upper connecting piece forming cavities are formed in the upper connecting piece forming mold. In the using process of the three-way inner cavity hole forming assembly, a plurality of connecting pieces can be formed through one-mold multi-cavity design in a one-time injection molding mode, the three-way inner cavity hole forming assembly is uniquely designed, and complex inner cavity structures of the three-way connecting pieces can be accurately formed through accurate matching of the core pulling shafts and the synergistic effect of the core pulling shafts and the protrusions of the forming cavities. And the size precision and the shape accuracy of the product are ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to die technical field relates to a kind of folding work trolley connecting piece one-mold multi-cavity injection mold. BACKGROUND

[0002] In the production of folding work trolley, connecting piece as key component, its manufacturing process and die performance directly affect the quality and production efficiency of work trolley. The traditional injection mold is mostly single-cavity design, only single connecting piece can be shaped at a time, and the production efficiency is low, which is difficult to meet the large-scale production demand. At the same time, for the connecting piece with complex tee structure, the precision of the traditional mold is difficult to guarantee when forming its inner cavity, which leads to low product qualification rate, increased scrap rate and rising production cost. Therefore, it has become an urgent problem in the industry to develop an injection mold that can efficiently and accurately form the connecting piece of folding work trolley.

[0003] In order to overcome the shortcomings of the prior art, people have explored various solutions, such as a child's trolley front support connecting piece die-casting mold [application number: 202222925006.2] disclosed by Chinese patent, which includes a lower die seat, a feed channel and a casting groove opened on the top of the lower die seat, wherein the feed channel and the casting groove are in communication with each other, and the slag ladle groove is symmetrically opened on the top of the lower die seat and located on both sides of the casting groove, wherein the slag ladle groove and the casting groove are in communication with each other, the lower die seat is provided with a base below, the base is fixed with a support plate on the top, the support plate is fixed with the lower die seat on the top, the upper die seat is provided with a feed inlet on the top. However, this scheme still cannot synchronously form multiple tee connecting pieces during injection molding, and the complex inner cavity structure of the tee connecting piece also needs secondary processing, which has the defects of multiple processes, low qualification rate and high cost. UTILITY MODEL CONTENTS

[0004] The utility model aims at the above problem, and provides a kind of folding work trolley connecting piece one-mold multi-cavity injection mold.

[0005] To achieve the above object, the utility model adopts the following technical scheme:

[0006] A kind of folding work trolley connecting piece one-mold multi-cavity injection mold, including connecting piece forming lower die and connecting piece forming upper die, the connecting piece forming upper die is equipped with injection main plate above, the connecting piece forming lower die is equipped with two connecting piece forming lower cavities in, the connecting piece forming upper die is equipped with two connecting piece forming upper cavities in, the connecting piece forming lower cavity is opposite with the connecting piece forming upper cavity, the connecting piece forming lower die and connecting piece forming upper die are equipped with tee inner cavity hole forming assembly that can reciprocate along the horizontal direction straight line, the connecting piece forming lower die is equipped with the ejector that extends into the connecting piece forming lower cavity below.

[0007] In the folding work trolley connecting piece one-mold multi-cavity injection mold, the three-way inner cavity hole forming assembly comprises a three-way main hole forming piece and a three-way side hole forming piece arranged between the connecting piece forming lower mold and the connecting piece forming upper mold, and the three-way main hole forming piece and the three-way side hole forming piece are arranged alternately.

[0008] In the folding work trolley connecting piece one-mold multi-cavity injection mold, the three-way main hole forming piece comprises two main hole core-pulling shafts arranged between the connecting piece forming lower mold and the connecting piece forming upper mold, and the outer end of the main hole core-pulling shaft is provided with a first sliding seat, and the first sliding seat is fixedly connected with the main hole core-pulling shaft.

[0009] In the folding work trolley connecting piece one-mold multi-cavity injection mold, the connecting piece forming lower mold is provided with two first air cylinders, and the power shaft of the first air cylinder is fixedly connected with the first sliding seat.

[0010] In the folding work trolley connecting piece one-mold multi-cavity injection mold, the three-way side hole forming piece comprises a second sliding seat arranged between the connecting piece forming lower mold and the connecting piece forming upper mold, the inner side of the second sliding seat is provided with two side hole core-pulling shafts parallel to each other, and the side hole core-pulling shafts are arranged alternately with the main hole core-pulling shafts.

[0011] In the folding work trolley connecting piece one-mold multi-cavity injection mold, the connecting piece forming lower mold is provided with a second air cylinder, and the power shaft of the second air cylinder is fixedly connected with the second sliding seat.

[0012] In the folding work trolley connecting piece one-mold multi-cavity injection mold, the connecting piece forming lower cavity is provided with a three-way lower hole forming protrusion, the connecting piece forming upper cavity is provided with a three-way upper hole forming protrusion, and the three-way lower hole forming protrusion is arranged opposite to the three-way upper hole forming protrusion.

[0013] In the folding work trolley connecting piece one-mold multi-cavity injection mold, the ejector comprises a ejector rod fixed plate arranged below the connecting piece forming lower mold, and a plurality of straight ejector rods are arranged on the ejector rod fixed plate.

[0014] In the folding work trolley connecting piece one-mold multi-cavity injection mold, the two sides of the ejector rod fixed plate are provided with anti-deviation bars, and the ejector rod fixed plate and the anti-deviation bars are in sliding fit.

[0015] In the folding work trolley connecting piece one-mold multi-cavity injection mold, the lower mold cooling water pipe is arranged in the connecting piece forming lower mold, and the upper mold cooling water pipe is arranged in the connecting piece forming upper mold.

[0016] Compared with the prior art, the folding work trolley connecting piece one-mold multi-cavity injection mold has the following advantages:

[0017] 1. The utility model discloses a three -way inner cavity hole forming assembly, through the accurate cooperation of each core -pulling shaft and the synergistic effect with the forming cavity convex, can accurately form the complex inner cavity structure of three -way connecting piece, guarantees the size precision and shape accuracy of product.

[0018] 2. The utility model discloses a high -efficient ejection mechanism and cooling system, significantly shorten the production cycle, improve the output in unit time, reduce the production cost.

[0019] The other advantages, objects and features of the utility model will be embodied partly through the following description, and the skilled in the art will also understand partly through the research and practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the structure schematic diagram of the utility model.

[0021] Figure 2 It is the local structure schematic diagram of the utility model.

[0022] Figure 3 It is the local structure schematic diagram of the utility model.

[0023] Figure 4 It is the local structure schematic diagram of another direction of the utility model.

[0024] Figure 5 It is the structure schematic diagram of connecting piece forming upper die.

[0025] In the drawing: connecting piece forming lower die 1, connecting piece forming upper die 2, injection molding mainboard 3, connecting piece forming lower cavity 4, connecting piece forming upper cavity 5, three -way inner cavity hole forming assembly 6, ejector 7, three -way main hole forming piece 8, three -way side hole forming piece 9, main hole core -pulling shaft 10, first sliding seat 11, first air cylinder 12, second sliding seat 13, side hole core -pulling shaft 14, second air cylinder 15, three -way lower part hole forming convex 16, three -way upper part hole forming convex 17, top rod fixed plate 18, straight top rod 19, prevent deflection inch iron 20, lower die cooling water pipe 21, upper die cooling water pipe 22. DETAILED DESCRIPTION

[0026] The utility model will be further explained below in combination with the drawings.

[0027] As Figures 1-5As shown, a folding work cart connector connecting piece one mold multi-cavity injection mold, including connector forming lower die 1 and connector forming upper die 2, the connector forming upper die 2 top is equipped with injection main plate 3, the connector forming lower die 1 inside is equipped with two connector forming lower cavity 4, the connector forming upper die 2 inside is equipped with two connector forming upper cavity 5, the connector forming lower cavity 4 and connector forming upper cavity 5 are opposite and are provided, the connector forming lower die 1 and connector forming upper die 2 between be equipped with three-way inner cavity hole forming assembly 6 that can reciprocate along the horizontal direction straight line, the connector forming lower die 1 below is equipped with the ejector 7 that extends into to the connector forming lower cavity 4.

[0028] In this embodiment, injection main plate 3 is used to inject molten plastic material into the mold cavity, the connector forming lower die 1 inside is equipped with two connector forming lower cavity 4, the connector forming upper die 2 inside is equipped with two connector forming upper cavity 5, and the connector forming lower cavity 4 and the connector forming upper cavity 5 are opposite and are provided, in the injection process, the upper die 2 and the lower die 1 are combined, the upper and lower cavities are aligned, forming a complete cavity for molding folding work cart three-way connector, compared with the traditional single-cavity mold, two connectors can be produced at a time, which greatly improves the production efficiency and reduces the production cost per unit product, the unique design of the three-way inner cavity hole forming assembly can accurately form the complex inner cavity structure of the three-way connector through the precise cooperation of each core-pulling shaft and the protrusion of the forming cavity, ensuring the dimensional accuracy and shape accuracy of the product.

[0029] Combined Figures 1-5 As shown, the three-way inner cavity hole forming assembly 6 includes a three-way main hole forming piece 8 and a three-way side hole forming piece 9 arranged between the connector forming lower die 1 and the connector forming upper die 2, and the three-way main hole forming piece 8 and the three-way side hole forming piece 9 are staggered.

[0030] Specifically, the three-way inner cavity hole forming assembly 6 is arranged between the connector forming lower die 1 and the connector forming upper die 2 and can reciprocate linearly along the horizontal direction, the assembly includes a three-way main hole forming piece 8 and a three-way side hole forming piece 9, which are staggered, this staggered design can cleverly utilize the mold space and accurately form the complex internal hole structure of the three-way connector, providing a basis for subsequent accurate molding of each hole of the three-way connector.

[0031] The three-way main hole forming piece 8 includes two main hole core-pulling shafts 10 arranged between the connector forming lower die 1 and the connector forming upper die 2, the outer end of the main hole core-pulling shaft 10 is provided with a first sliding seat 11, and the first sliding seat 11 is fixedly connected with the main hole core-pulling shaft 10.

[0032] In this embodiment, the three-way main hole forming part 8 comprises two main hole core-pulling shafts 10 arranged between the connector forming lower die 1 and the connector forming upper die 2, and the outer end of the main hole core-pulling shaft 10 is fixedly connected with the first sliding seat 11. In the preparation stage before injection molding, the first sliding seat 11 can drive the main hole core-pulling shaft 10 to move under the action of external force, so that the main hole core-pulling shaft 10 reaches the specified forming position, cooperates with the connector forming lower cavity 4 and the connector forming upper cavity 5, and builds the forming space of the three-way main hole. After the product is cooled after injection molding, the first sliding seat 11 drives the main hole core-pulling shaft 10 to be pulled out of the formed three-way connector, so as to smoothly take out the product, and the forming precision and integrity of the three-way main hole are ensured.

[0033] In combination Figure 2 As shown, the connector forming lower die 1 is provided with two first air cylinders 12, and the power shaft of the first air cylinder 12 is fixedly connected with the first sliding seat 11.

[0034] In this embodiment, the first air cylinder 12 serves as a power source, and the linear reciprocating motion of the main hole core-pulling shaft 10 is accurately controlled through the extension and retraction motion of the power shaft of the first air cylinder 12. This air cylinder driving mode has the advantages of fast response speed and high control precision, and can accurately control the position of the main hole core-pulling shaft 10 before and after injection molding, thereby ensuring the forming quality and production efficiency of the three-way main hole.

[0035] The three-way side hole forming part 9 comprises a second sliding seat 13 arranged between the connector forming lower die 1 and the connector forming upper die 2, and the inner side of the second sliding seat 13 is provided with two mutually parallel side hole core-pulling shafts 14, which are arranged alternately with the main hole core-pulling shaft 10.

[0036] In this embodiment, after the main hole core-pulling shaft 10 reaches the forming position, the second sliding seat 13 drives the side hole core-pulling shaft 14 to move to the corresponding position, cooperates with the main hole core-pulling shaft 10 and the connector forming lower cavity 4 and the connector forming upper cavity 5, and forms a complete space for forming the three-way side hole, thereby realizing the accurate forming of the three-way connector side hole.

[0037] In combination Figure 2 As shown, the connector forming lower die 1 is provided with a second air cylinder 15, and the power shaft of the second air cylinder 15 is fixedly connected with the second sliding seat 13.

[0038] In this embodiment, the second air cylinder 15 accurately drives the movement of the second sliding seat 13 through the extension and retraction of the power shaft, thereby controlling the position of the side hole core-pulling shaft 14. Similar to the driving mode of the main hole forming part, this air cylinder driving mode of the side hole core-pulling shaft 14 ensures the accuracy and stability of the side hole forming process, and further improves the forming precision and production efficiency of the three-way connector side hole.

[0039] The connector forming lower cavity 4 has a three-way lower hole forming protrusion 16, and the connector forming upper cavity 5 has a three-way upper hole forming protrusion 17, and the three-way lower hole forming protrusion 16 is arranged opposite to the three-way upper hole forming protrusion 17.

[0040] In the embodiment, the protrusions cooperate with the three-way inner cavity hole forming assembly 6 during injection molding, further refining and accurately forming the inner cavity structure of the three-way connector, and through the cooperation of the upper and lower hole forming protrusions and the core-pulling shaft, the size accuracy and shape accuracy of the inner hole of the three-way connector are ensured, and the product quality is improved.

[0041] In combination Figures 1-4 As shown, the ejector 7 includes an ejector rod fixing plate 18 arranged below the connector forming lower mold 1, and a plurality of straight ejector rods 19 are arranged on the ejector rod fixing plate 18.

[0042] In the embodiment, when the injection molding is completed and the mold is opened, the ejector rod fixing plate 18 moves upward under the action of external power, and the straight ejector rods 19 eject the formed three-way connector from the connector forming lower cavity 4, which facilitates the operator to take out the product and improves the automation degree and production efficiency of the production process.

[0043] In combination Figures 1-4 As shown, the ejector rod fixing plate 18 is provided with anti-deviation inch iron 20 on both sides, and the ejector rod fixing plate 18 is in sliding cooperation with the anti-deviation inch iron 20.

[0044] In the embodiment, during the process that the ejector rod fixing plate 18 moves upward to eject the product, the anti-deviation inch iron 20 plays a guiding and anti-deviation role, prevents the ejector rod fixing plate 18 from deviating during the movement, ensures that the straight ejector rods 19 can vertically and stably eject the product, avoids product damage or deformation caused by deviation during the ejection process, and improves the quality of the product and the stability of the production.

[0045] In combination Figure 2 , Figure 4 As shown, the connector forming lower mold 1 is provided with a lower mold cooling water pipe 21, and the connector forming upper mold 2 is provided with an upper mold cooling water pipe 22.

[0046] In the embodiment, during the injection molding process, the cooling liquid is circulated into the cooling water pipe, which can quickly take away the heat generated by the injection molding of the mold, so that the mold and the formed product are rapidly cooled, which not only shortens the molding cycle of the product and improves the production efficiency, but also ensures that the product is uniformly cooled during the cooling process, avoids quality problems such as product deformation and size deviation caused by uneven cooling, and further improves the product quality.

[0047] The working principle of the utility model is:

[0048] In the injection molding process, the injection molding machine is started, and the connector forming upper die 2 is driven to move downward to close with the connector forming lower die 1. During the closing process, the connector forming lower cavity 4 and the connector forming upper cavity 5 are accurately aligned to form a complete cavity, and at the same time, the first cylinder 12 pushes the first sliding seat 11 to move the main hole core-pulling shaft 10 to the predetermined molding position; then, the second cylinder 15 pushes the second sliding seat 13 to move the side hole core-pulling shaft 14 to the corresponding position, completing the preparation work of the three-way inner cavity hole forming assembly 6, and building the space for molding the three-way connector inner cavity,

[0049] Through the injection of the main plate 3, the heated and molten plastic material is injected into the mold cavity at a certain pressure and speed. The plastic melt fills the entire cavity, including the inner cavity space formed by the three-way inner cavity hole forming assembly 6 and the part defined by the three-way lower hole forming protrusion 16 and the three-way upper hole forming protrusion 17,

[0050] After the injection molding is completed, a certain holding pressure is maintained for a certain period of time to allow the plastic to be fully compacted in the cavity, eliminating shrink marks and other problems caused by plastic cooling shrinkage, ensuring the dimensional accuracy and surface quality of the product. At the same time, the mold is cooled by circulating cooling liquid through the lower mold cooling water pipe 21 and the upper mold cooling water pipe 22, and the cooling liquid absorbs the heat of the mold and the product, allowing the plastic to rapidly solidify and form,

[0051] After the product is cooled and solidified, the injection molding machine drives the connector forming upper die 2 to move upward to open the mold, and at the same time, the first cylinder 12 is reversely actuated to drive the first sliding seat 11, so that the main hole core-pulling shaft 10 is pulled out from the molded three-way connector; then, the second cylinder 15 is reversely actuated to drive the second sliding seat 13, so that the side hole core-pulling shaft 14 is pulled out from the molded three-way connector, completing the inner cavity core-pulling action,

[0052] After the mold is opened, the ejection mechanism of the injection molding machine drives the ejector rod fixed plate 18 to move upward, and the ejector rod fixed plate 18 drives the straight ejector rod 19 to eject the two molded three-way connectors from the connector forming lower cavity 4, and the operator can conveniently take out the product, completing the injection molding process.

[0053] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or use similar ways to replace them without deviating from the spirit of the present application.

[0054] Although the terms such as connector forming lower die 1, connector forming upper die 2, injection molding main plate 3, connector forming lower cavity 4, connector forming upper cavity 5, three-way inner cavity hole forming assembly 6, ejector 7, three-way main hole forming piece 8, three-way side hole forming piece 9, main hole core-pulling shaft 10, first sliding seat 11, first air cylinder 12, second sliding seat 13, side hole core-pulling shaft 14, second air cylinder 15, three-way lower hole forming protrusion 16, three-way upper hole forming protrusion 17, ejector rod fixing plate 18, straight ejector rod 19, anti-deviation inch bar 20, lower die cooling water pipe 21, upper die cooling water pipe 22, etc. are used more in the text, but the possibility of using other terms is not excluded. Using these terms is only for more convenient description and explanation of the essence of the utility model, and it is against the spirit of the utility model to interpret them as any kind of additional limitation.

Claims

1. A multi-cavity injection mold for folding work trolley connectors, comprising a connector forming lower mold (1) and a connector forming upper mold (2), characterized in that, The injection molding main plate (3) is arranged above the connecting piece forming upper die (2), two connecting piece forming lower cavities (4) are arranged in the connecting piece forming lower die (1), two connecting piece forming upper cavities (5) are arranged in the connecting piece forming upper die (2), the connecting piece forming lower cavities (4) and the connecting piece forming upper cavities (5) are arranged opposite to each other, the three-way inner cavity hole forming assembly (6) is arranged between the connecting piece forming lower die (1) and the connecting piece forming upper die (2) and can move linearly in the horizontal direction, and the ejector (7) is arranged below the connecting piece forming lower die (1) and extends into the connecting piece forming lower cavities (4).

2. The injection mold according to claim 1, wherein, The three-way inner cavity hole forming assembly (6) comprises the three-way main hole forming piece (8) and the three-way side hole forming piece (9) arranged between the connecting piece forming lower die (1) and the connecting piece forming upper die (2), and the three-way main hole forming piece (8) and the three-way side hole forming piece (9) are arranged alternately.

3. The mold of claim 2, wherein, The three-way main hole forming piece (8) comprises two main hole core-pulling shafts (10) arranged between the connecting piece forming lower die (1) and the connecting piece forming upper die (2), and a first sliding seat (11) is arranged at the outer end of the main hole core-pulling shaft (10) and fixedly connected with the main hole core-pulling shaft (10).

4. The mold of claim 3, wherein, The first cylinder (12) is arranged on the connecting piece forming lower die (1) and the power shaft of the first cylinder (12) is fixedly connected with the first sliding seat (11).

5. The mold of claim 4, wherein, The three-way side hole forming piece (9) comprises a second sliding seat (13) arranged between the connecting piece forming lower die (1) and the connecting piece forming upper die (2), and two side hole core-pulling shafts (14) are arranged on the inner side of the second sliding seat (13) and arranged alternately with the main hole core-pulling shaft (10).

6. The mold of claim 5, wherein, The second cylinder (15) is arranged on the connecting piece forming lower die (1) and the power shaft of the second cylinder (15) is fixedly connected with the second sliding seat (13).

7. The mold of claim 6, wherein, The three-way lower hole forming protrusion (16) is arranged in the connecting piece forming lower cavity (4), the three-way upper hole forming protrusion (17) is arranged in the connecting piece forming upper cavity (5), and the three-way lower hole forming protrusion (16) and the three-way upper hole forming protrusion (17) are arranged opposite to each other.

8. The mold of claim 7, wherein, The ejector (7) comprises a ejector rod fixing plate (18) arranged below the connecting piece forming lower die (1), and a plurality of straight ejector rods (19) are arranged on the ejector rod fixing plate (18).

9. The mold of claim 8, wherein, The anti-deviation inch iron (20) is arranged on both sides of the ejector rod fixing plate (18) and in sliding fit with the ejector rod fixing plate (18).

10. The mold of claim 9, wherein, The lower die cooling water pipe (21) is arranged in the connecting piece forming lower die (1), and the upper die cooling water pipe (22) is arranged in the connecting piece forming upper die (2).

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