Injection mold for pipe fitting with spiral rib position

Abstract

The utility model relates to the field of injection molding, in particular to an injection mold for pipe fittings with spiral rib positions, which comprises a fixed mold and a movable mold, a conical cavity is arranged in the movable mold, the fixed mold comprises a fixed mold body and a sliding seat, a conical mold core is fixed on the fixed mold body, a plurality of spiral grooves are arranged on the outer wall of the mold core, and an injection molding cavity is formed between the mold core and the cavity during mold closing. A material pushing ring is rotationally arranged in the sliding seat, the material pushing ring is rotationally connected to the mold core and can abut against the bottom end of the workpiece, an ejector rod is connected to the bottom of the sliding seat, a push plate is fixed to the bottom end of the ejector rod, a guide column is arranged in the fixed mold body, and the push plate is slidably connected to the guide column. The pipe fitting is driven to rotate by pushing the material pushing ring, and smooth demolding of the pipe fitting with the spiral rib can be achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection molding field, concretely relates to a pipe fitting injection mold with spiral rib. BACKGROUND

[0002] Injection molding is a commonly used industrial manufacturing technology, which is widely used in batch production of plastic products. Its principle is to inject molten plastic into a mold, then cool and solidify to form a product of the desired shape, and the product is pushed out of the mold by a ejector pin or ejector rod after molding.

[0003] Many complex pipe fittings are designed with spiral ribs on the inner wall of the pipe fitting to enhance its structural strength, improve fluid dynamics characteristics or achieve specific functions. When these pipe fittings are demolded after molding, it is not convenient to push them directly out of the mold due to the presence of spiral ribs. If they are pushed out directly, they may be damaged and scrapped under the action of a large demolding force. SUMMARY

[0004] The utility model intends to provide a pipe fitting injection mold with spiral ribs to achieve smooth demolding of pipe fittings with spiral ribs.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0006] The pipe fitting injection mold with spiral ribs comprises a fixed mold and a movable mold. A conical cavity is formed in the movable mold. The fixed mold comprises a fixed mold body and a sliding seat. A conical mold core is fixed on the fixed mold body. A plurality of spiral grooves are formed on the outer wall of the mold core. An injection cavity is formed between the mold core and the cavity when the mold is closed. The injection cavity is connected with an injection runner. A pushing ring is rotatably arranged in the sliding seat and rotatably connected with the mold core and capable of abutting against the bottom end of the workpiece. A ejector rod is connected with the bottom of the sliding seat. A push plate is fixed at the bottom end of the ejector rod. A guide column is arranged in the fixed mold body. The push plate is slidably connected with the guide column.

[0007] Preferably, as an improvement, the spiral grooves are uniformly distributed on the mold core. A plurality of distribution runners are arranged on the top of the mold core and connected with the injection runner. The distribution runners are one-to-one correspondingly connected with the spiral grooves.

[0008] Preferably, as an improvement, the plurality of distribution runners converge at the center of the top of the mold core and are connected with the injection runner.

[0009] Preferably, as an improvement, a core rod is fixed on the fixed mold body and slidably connected with the push plate. The core rod penetrates into the mold core and the axis of the core rod coincides with the axis of the mold core.

[0010] Preferably, as an improvement, at least four cooling runners are arranged in the mold core along the axial direction. The cooling runners are connected with cooling pipe joints. The cooling pipe joints are arranged on the fixed mold body. The cooling runners are arranged in an array with the axis of the mold core as the center.

[0011] Preferably, as an improvement, the number of guide columns is at least two, and the guide column array is arranged.

[0012] Preferably, as an improvement, the number of guide columns is four, and the number of ejector rods is also four.

[0013] Preferably, as an improvement, the pushing ring is rotatably connected to the mold core through a bearing.

[0014] The principles and beneficial effects of the present scheme are:

[0015] 1. The pushing ring is rotatably arranged on the mold core, and is rotatably pressed on the slide of the fixed mold. After injection molding, the movable mold and the fixed mold are separated, the product is exposed, the pushing plate is driven to move the ejector rod and the slide towards the mold core, the slide provides a pushing force towards the mold core to the pushing ring, so that the product rotates along the spiral groove under the pushing action of the slide and the pushing ring, thereby rotating the product out of the mold core and completing demolding. The present scheme realizes the injection molding of the pipe with spiral groove on the inner wall, utilizes the characteristics of the product spiral rib to push the product to rotate, successfully realizes the demolding of the product, does not cause deformation and damage of the product, has high demolding success rate and high product quality.

[0016] 2. The plurality of arrayed ejector rods push the slide to provide uniform pushing force to the slide, so that the slide is balanced in force. In addition, the pushing force is transmitted to the pushing ring through the slide, which can make the pushing ring more balanced in force compared with directly pushing the pushing ring with the ejector rod, so that the product rotates more smoothly, and the pushing ring can also be prevented from being damaged due to stress concentration, prolonging the service life of the pushing ring.

[0017] 3. The plurality of ejector rods are centrally connected to the pushing plate, which facilitates simultaneous driving of the plurality of ejector rods, and only the pushing plate needs to be driven to simultaneously drive the plurality of ejector rods, without the need for separate driving of the plurality of ejector rods, which not only saves power resources, but also ensures the consistency of the action of the plurality of ejector rods, thereby balancing the force of the slide and the pushing ring and improving the sliding stability thereof.

[0018] 4. The present scheme provides a plurality of arrayed guide columns, which can provide more balanced and stable guidance to the pushing plate compared with only one guide column, and the guidance effect is better.

[0019] 5. This solution sets a branch channel at the top of the mold core to connect the spiral groove and the injection runner respectively. In this way, only one injection runner is needed to transmit the injection material to all the spiral grooves. On this basis, this solution sets the injection runner in the middle of the mold core, and multiple spiral grooves are evenly distributed on the mold core. This can make the flow rate of the injection material in multiple spiral grooves the same, and thus make the injection speed of each part of the product constant, ensuring the consistency of each part of the product and improving the injection quality of the product. In addition, the spiral groove is connected to the injection runner, and the spiral groove can be injected first during injection. Compared with the spiral groove being injected later, this method can ensure that the spiral groove is partially filled, thereby ensuring product quality.

[0020] 6. This solution sets a core rod on the fixed mold body and passes it into the mold core. On the one hand, it can improve the installation stability of the mold core. On the other hand, it is convenient to align the mold core during assembly, thereby improving assembly efficiency.

[0021] 7. This solution sets up at least 3 arrays of cooling channels in the mold core, which can provide uniform and efficient cooling for the product, thereby achieving a good cooling effect and allowing the product to cool and shape quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of an embodiment of the present utility model.

[0023] Figure 2 This is a schematic diagram of the structure of part of the embodiment of the utility model after removing the movable mold.

[0024] Figure 3 for Figure 2 Schematic diagram of the structure from another perspective.

[0025] Figure 4 It is a cross-sectional view of an embodiment of the present utility model. DETAILED DESCRIPTION

[0026] The following is further described in detail through specific implementation methods:

[0027] The figure marks in the drawings of the specification include: movable mold 1, cavity 11, injection cavity 12, fixed mold 2, fixed mold body 21, slide 22, core rod 23, push plate 3, ejector rod 31, guide column 32, bearing 33, push ring 34, cooling pipe joint 4, cooling flow channel 41, mold core 5, spiral groove 51, and branch channel 52.

[0028] Example:

[0029] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown, the injection mold with helical rib position pipe fittings comprises a fixed mold 2 and a movable mold 1, and a conical cavity 11 is formed in the movable mold 1. The fixed mold 2 comprises a fixed mold body 21 and a sliding seat 22, and a conical mold core 5 is fixed on the fixed mold body 21 by bolts. A plurality of helical grooves 51 are uniformly formed on the outer wall of the mold core 5, and the number of the helical grooves 51 is three in this embodiment. When the mold is closed, the injection cavity 12 is formed between the mold core 5 and the cavity 11. The injection cavity 12 is connected with an injection runner, which is one in this embodiment. Three distribution runners 52 are uniformly formed on the top of the mold core 5, and each helical groove 51 is connected with one distribution runner 52. The three distribution runners 52 converge at the center of the top of the mold core 5 and are connected with the injection runner.

[0030] A pushing ring 34 is rotatably connected to the mold core 5 by a bearing 33, and a ring groove is formed on the inner wall of the sliding seat 22. The pushing ring 34 is rotatably connected to the sliding seat 22 through the ring groove. The pushing ring 34 serves as the bottom of the injection cavity 12, that is, the pushing ring 34 abuts against the bottom of the product. Four ejector rods 31 are connected to the bottom of the sliding seat 22, and an ejecting cavity is formed on the fixed mold body 21. A push plate 3 is arranged in the ejecting cavity, and the bottom end of the ejector rod 31 is fixed on the push plate 3 by bolts. Four guide columns 32 are vertically arranged in the ejecting cavity, and the push plate 3 is slidably connected to the four guide columns 32. A core rod 23 is fixed on the fixed mold body 21 and slidably connected to the push plate 3. The core rod 23 penetrates into the mold core 5, and the axis of the core rod 23 coincides with the axis of the mold core 5.

[0031] At least three cooling channels 41 are formed in the mold core 5 along the axial direction, and the number of the cooling channels 41 is five in this embodiment. The five cooling channels 41 are connected with each other and connected with a cooling pipe joint 4, which is installed on the side wall of the fixed mold body 21. The five cooling channels 41 are arranged in an array with the axis of the mold core 5 as the center.

[0032] The working principle of the injection mold with helical rib position pipe fittings is as follows:

[0033] The fixed mold 2 and the movable mold 1 are closed, and the injection material is injected from the injection runner. After the injection material is cooled and solidified, the pipe fitting product with helical ribs on the inner wall is formed. When the mold is opened, the product is exposed. The push plate 3 is moved towards the mold core 5 by the ejecting mechanism of the injection machine, the ejector rod 31 is moved by the push plate 3, the sliding seat 22 is moved towards the mold core 5 by the ejector rod 31, and thus the pushing plate is moved towards the mold core 5. Since the helical ribs on the inner wall of the product are located in the helical grooves 51 of the mold core 5, the product rotates along the helical grooves 51 under the pushing force of the pushing ring 34, so that the product is taken off from the mold core 5, and the demolding of the product is completed.

[0034] The above only is the embodiment of the present application, and the well-known specific technical solutions and / or common knowledge in the scheme are not described in detail. It should be pointed out that, for those skilled in the art, without departing from the technical solutions of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, and these will not affect the effect and practicality of the present application. The protection scope claimed in the present application should be subject to the content of its claims, and the specific implementation mode and the like recorded in the specification can be used to explain the content of the claims.

Claims

1. Injection mold for pipe fittings with spiral ribs, characterized by: It includes a fixed mold and a movable mold, a conical cavity is opened in the movable mold, the fixed mold includes a fixed mold body and a slide, a conical mold core is fixed on the fixed mold body, and a plurality of spiral grooves are opened on the outer wall of the mold core. When the mold is closed, an injection cavity is formed between the mold core and the mold cavity, and the injection cavity is connected with an injection runner. A push ring is rotatably arranged in the slide, and the push ring is rotatably connected to the mold core and can be against the bottom end of the workpiece. A push rod is connected to the bottom of the slide, and a push plate is fixed to the bottom end of the push rod. A guide column is arranged in the fixed mold body, and the push plate is slidably connected to the guide column.

2. The injection mold for a pipe fitting with spiral ribs according to claim 1, characterized in that: The spiral grooves are evenly distributed on the mold core, and a plurality of branch channels are arranged on the top of the mold core. The plurality of branch channels are all connected with the injection flow channel, and the branch channels are connected with the spiral grooves in a one-to-one correspondence.

3. The injection mold for a pipe fitting with spiral ribs according to claim 2, characterized in that: Multiple branch channels converge at the top center of the mold core and are connected to the injection runner.

4. The injection mold for a pipe fitting with spiral ribs according to claim 3, characterized in that: A core rod is fixed on the fixed mold body, the core rod is slidably connected to the push plate, the core rod is inserted into the mold core, and the axis of the core rod coincides with the axis of the mold core.

5. The injection mold for a pipe fitting with spiral ribs according to claim 4, characterized in that: At least three cooling channels are arranged axially in the mold core. The cooling channels are connected to cooling pipe joints, which are arranged on the fixed mold body. The cooling channels are arranged in an array with the axis of the mold core as the center.

6. The injection mold for a pipe fitting with spiral ribs according to claim 5, characterized in that: The number of the guide posts is at least two, and the guide posts are arranged in an array.

7. The injection mold for a pipe fitting with spiral ribs according to claim 6, characterized in that: The number of guide columns is four, and the number of ejector rods is also four.

8. The injection mold for a pipe fitting with spiral ribs according to claim 7, characterized in that: The push ring is rotatably connected to the mold core through a bearing.

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