Elbow pipe fitting injection mold
By using an air-blowing component and improving the parting surface design in the injection mold of elbow pipe fittings, the problem of low ejection efficiency of ejector pins was solved, achieving efficient demolding and reduced maintenance costs.
Patent Information
- Application Number
- CN202423294619.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2034-12-31
AI Technical Summary
Existing injection molds for elbow pipe fittings are inefficient when ejecting products with ejector pins, and the ejector pins are easily damaged, requiring frequent maintenance, resulting in low production efficiency and increased maintenance costs.
The design employs an air-blowing component, which reduces the adhesion between the product and the mold by blowing air into the product slot when the mold opens, allowing the product to detach directly from the mold without the need for ejector pins. The parting surface structure of the mold is improved to further reduce adhesion.
It improves product production efficiency, reduces the frequency of use and maintenance costs of ejector pins, and ensures product integrity and stability.
Smart Images
Figure CN223750131U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to injection mold technical field more particularly, relate to a kind of elbow pipe fittings injection mold. BACKGROUND
[0002] PP-R45 elbow pipe fittings product is mainly formed by injection mold, such as the molding mold of elbow pipe fittings disclosed in prior art, it includes fixed mold frame, movable mold frame and core, fixed mold frame, movable mold frame and core constitute multiple molding mold cavity and runner with elbow pipe fittings between, the discharge port of runner is connected with mold cavity, the both ends of the runner of lower cavity are equipped with runner ejection mechanism inside, runner ejection mechanism includes first spring and elastic block, elastic block is connected on the lower mold fixed frame of movable mold frame side by first spring, and extend to the runner inside of lower cavity, and recess is set on the upper end surface of elastic block, recess both sides extend horizontally to the both sides of runner, so that runner ejection mechanism under closed mold state is compressed in movable mold frame.After injection molding, by the opening of movable mold frame and fixed mold frame and movable mold frame and lower mold fixed frame, elastic block is ejected by first spring, so that product floats, pin mechanism ejects the runner of injection molding, product is ejected along with one. After product ejection, product is taken out using manipulator.
[0003] However, the mold using pin to eject product has several defects. First, since the adhesion of product to mold is larger, pin needs a certain time to eject product, manipulator needs to take out product after product is completely ejected, and the production efficiency of product is not high enough. Secondly, since pin needs to bear compression stress in the process of lifting product, it is easy to bend and needs to be maintained frequently, which will cause certain maintenance cost. UTILITY MODEL CONTENTS
[0004] In view of the problem of low production efficiency of the mold using pin to eject product in the prior art, the utility model provides an elbow pipe fittings injection mold, which can smoothly demold product without pin, and can improve production efficiency.
[0005] To solve the above technical problems, the technical scheme provided by the utility model is:
[0006] An elbow pipe fittings injection mold, comprising an upper mold and a lower mold, a main runner is arranged on the upper mold or the lower mold, a first product groove is arranged on the upper mold, a second product groove is arranged on the lower mold, the first product groove and the second product groove form a product shape cavity in communication with the main runner under the closed mold state, and the product shape cavity is used to form the shape of product; a first blowing assembly is arranged on the lower mold, and the outlet end of the first blowing assembly is in communication with the second product groove.
[0007] In the above technical solution, when the mold is closed, the molten material enters the product shape cavity through the main runner; after the molten material in the product shape cavity cools and solidifies, the mold is opened, that is, the upper mold is separated from the lower mold under the driving of the external driving mechanism; at this time, the product is adhered to the second product groove, and the first blowing assembly immediately blows into the second product groove, so that the mutual adhesion between the product and the inner wall of the second product groove is reduced due to the entry of the gas, so that the product can be more easily separated from the second product groove. Because the adhesion of the product to the inner wall of the second product groove is small, the mechanical hand can directly take out the product from the second product groove without using the ejector pin to eject the product. The demolding process of the product does not need the participation of the ejector pin, which saves the time of ejecting the product, improves the production efficiency of the product, and can save the cost of frequent maintenance of the ejector pin.
[0008] Preferably, the surface area of the second product groove is smaller than the surface area of the first product groove. In this way, the contact area of the product with the second product groove can be reduced, so that the product can be more easily separated from the second product groove.
[0009] Preferably, the first product groove comprises a full-circle groove and a half-circle groove in communication with the full-circle groove, and an axis of the half-circle groove forms an angle with an axis of the full-circle groove; the full-circle groove, the half-circle groove and the second product groove enclose the product shape cavity in the closed mold state. The elbow pipe fitting of the prior art comprises a first pipe segment and a second pipe segment, and an acute angle is formed between the axes of the first pipe segment and the second pipe segment, and a round corner is arranged at the connection between the first pipe segment and the second pipe segment. The full-circle groove is used to form the shape of the first pipe segment of the product, and the half-circle groove and the second product groove are spliced to form the shape of the second pipe segment and the round corner of the product. By improving the parting surface of the mold, the adhesion of the product to the second product groove can be further reduced, so that the product can be more easily taken out.
[0010] Preferably, the upper mold is provided with a second blowing assembly; the lower mold is provided with a second thin gas cavity, the second thin gas cavity is in communication with the outlet end of the second blowing assembly, and the second thin gas cavity is in communication with the half-circle groove in the closed mold state. It can be understood that the first blowing assembly blows gas into the second product groove at the same time, and the second blowing assembly blows gas into the half-circle groove through the second thin gas cavity, which can reduce the adhesion of the product to the inner wall of the half-circle groove, so that the product can be smoothly separated from the first product groove when the mold is opened, and the integrity of the product is ensured.
[0011] Preferably, the axis of the full-circle groove is in the vertical direction, so that one end of the formed product is upward, which can facilitate the mechanical hand to hold the product stably.
[0012] Preferably, a first thin gas cavity is formed on the lower mold, the outlet end of the first gas blowing assembly is communicated with the second product groove through the first thin gas cavity, and the outlet end of the first thin gas cavity extends from one side of the second product groove to the other side along the circumferential direction of the inner wall of the second product groove. In this way, the distribution of gas between the product and the second product groove can be more uniform, and the stress on each part of the product during demolding can be more consistent, thereby avoiding deformation or damage of the product caused by excessive local gas pressure.
[0013] Preferably, a plurality of gas supplement cavities are arranged on the lower mold, at least part of the gas supplement cavities are distributed along the extension direction of the first thin gas cavity and are communicated with the first thin gas cavity, and the first thin gas cavity is communicated with the outlet end of the first gas blowing assembly through the gas supplement cavities. In this way, the distribution of gas pressure in the first thin gas cavity can be more uniform, and the stress on each part of the product during demolding can be more consistent.
[0014] Preferably, the width of the outlet end of the first thin gas cavity is between 0.03 mm and 0.1 mm. The width here refers to the size of the outlet end of the first thin gas cavity in the product axis direction. Within this width range, it can be ensured that the molten material cannot enter the first thin gas cavity from the product profile cavity, but gas can enter the product profile cavity from the first thin gas cavity.
[0015] Preferably, a plurality of first product grooves are arranged on the upper mold, a plurality of second product grooves are arranged on the lower mold, the first product groove and the second product groove are paired to form a product profile cavity, and the product profile cavity is communicated with the outlet end of the first gas blowing assembly. It can be understood that a plurality of product profile cavities can be formed when the mold is closed, and a plurality of elbow pipe products can be produced in one injection molding process, thereby improving the production efficiency of the products.
[0016] Preferably, the first gas blowing assembly comprises a first gas blowing pipeline, a first gas inlet nozzle is arranged on the first gas blowing pipeline, the first gas inlet nozzle is located outside the lower mold, and the first thin gas cavities are communicated with the first gas blowing pipeline. In implementation, the first gas inlet nozzle is connected with a gas valve on the injection molding machine, gas enters the first gas blowing pipeline through the first gas inlet nozzle, and is delivered to each product profile cavity from the first gas blowing pipeline.
[0017] The utility model discloses the beneficial effects of:
[0018] 1, after the mold is opened, the first gas blowing assembly is used to blow gas to the second product groove, and the adhesion of the product to the lower mold can be reduced. Since the adhesion of the product to the lower mold is small, the mechanical hand can directly take out the product from the second product groove, without using the ejector pin to eject the product. The demolding process of the product does not need the participation of the ejector pin, the time for ejecting the product is saved, the production efficiency of the product is higher, and the cost of frequent maintenance of the ejector pin can be saved.
[0019] 2、First product slot is divided into whole circle slot and half circle slot, which improves the parting surface of the mold, can further reduce the adhesion of the product to the lower mold, makes the product easier to take out, and the axis of the whole circle slot in the vertical direction can facilitate the mechanical hand to grasp the product.
[0020] 3、Using the second blowing assembly to blow air to the first product slot can reduce the adhesion of the product to the upper mold, so that the product can smoothly separate from the upper mold after the mold is opened, and ensure the integrity of the product. BRIEF DESCRIPTION OF DRAWINGS
[0021] Figure 1 is a schematic diagram of the external structure of an elbow pipe injection mold;
[0022] Figure 2 is a schematic diagram of the bottom of the partial structure of the upper mold plate;
[0023] Figure 3 is a schematic diagram of the partial structure of the lower mold plate;
[0024] Figure 4 is a schematic diagram of the upper mold plate and the lower mold plate when they are attached;
[0025] Figure 5 is a schematic diagram of the structure of the elbow pipe product;
[0026] Figure 6 is Figure 3 is an enlarged schematic diagram of part A.
[0027] Figure 7 is a schematic diagram of the blowing insert structure;
[0028] Figure 8 is a schematic diagram of the distribution of the product on the lower mold plate
[0029] In the drawings: 1-upper mold base; 2-upper mold plate; 201-first product slot; 2011-whole circle slot; 2012-half circle slot; 3-main flow channel; 4-first core; 5-lower mold base; 6-lower mold plate; 601-second product slot; 602-second thin air cavity; 7-second core; 8-first blowing assembly; 801-first blowing pipeline; 802-first air inlet; 9-blowing insert; 901-first thin air cavity; 902-air supplement cavity; 10-second blowing assembly; 1001-second blowing pipeline; 1002-second air inlet; 11-product; 1101-first pipe section; 1102-second pipe section; 1103-round corner. DETAILED DESCRIPTION
[0030] The accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this patent.
[0031] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "long," and "short" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.
[0032] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:
[0033] Example 1
[0034] This embodiment is a first embodiment of an injection mold for an elbow pipe fitting, such as... Figures 1 to 4 As shown, it includes an upper mold and a lower mold. The upper mold includes an upper mold base 1 and an upper template 2 connected to the upper mold base 1. The upper mold is provided with a main channel 3. The upper template 2 is provided with a first product groove 201. The main channel 3 extends from the top of the upper mold base 1 to the first product groove 201 of the upper template 2. A first core 4 is provided in the first product groove 201. The lower template 6 is provided with a second product groove 601. A second core 7 is provided in the second product groove 601. In the mold-closed state, the upper template 2 and the lower template 6 are fitted together. The first product groove 201 and the second product groove 601 form a product outer cavity that is connected to the main channel 3. The product outer cavity is used to form the outer shape of the product 11. At the same time, the first core 4 and the second core 7 are fitted together and are used to form the inner cavity structure of the product 11. The lower template 6 is provided with a first air blowing assembly 8. The outlet end of the first air blowing assembly 8 is connected to the second product groove 601.
[0035] Specifically, the first blowing assembly 8 comprises a first blowing pipeline 801, the first blowing pipeline 801 is partially located inside the lower mold plate 6 and partially located outside the lower mold plate 6, and a first air inlet 802 is arranged on the part of the first blowing pipeline 801 located outside the lower mold plate 6; the second product groove 601 is in communication with the first blowing pipeline 801. In implementation, the first air inlet 802 is connected with an air valve on the injection molding machine, and the gas enters the first blowing pipeline 801 through the first air inlet 802 and is delivered to the second product groove 601 by the first blowing pipeline 801 to contact the product 11.
[0036] Further, the surface area of the second product groove 601 is smaller than the surface area of the first product groove 201. In this way, the contact area of the product 11 with the second product groove 601 can be reduced, so that the product 11 can be more easily separated from the second product groove 601.
[0037] Specifically, the first product groove 201 comprises a full-circle groove 2011 and a half-circle groove 2012 in communication with the full-circle groove 2011, and the axis of the half-circle groove 2012 forms an included angle with the axis of the full-circle groove 2011; the full-circle groove 2011, the half-circle groove 2012 and the second product groove 601 form a product contour cavity in the clamped state. The elbow pipe product 11 of the prior art comprises a first pipe segment 1101 and a second pipe segment 1102, and an acute angle is formed between the axes of the first pipe segment 1101 and the second pipe segment 1102, and a rounded corner 1103 is arranged at the connection between the first pipe segment 1101 and the second pipe segment 1102. The full-circle groove 2011 is used to form the outer shape of the first pipe segment 1101 of the product 11, and the half-circle groove 2012 and the second product groove 601 are spliced to form the outer shape of the second pipe segment 1102 and the rounded corner 1103 of the product 11. By improving the parting surface of the mold, the adhesion of the product 11 to the second product groove 601 can be further reduced, so that the product 11 can be more easily taken out.
[0038] Further, the axis of the full-circle groove 2011 is in the vertical direction, so that one end of the product 11 formed is upward, which can facilitate the stable grasping of the product 11 by the mechanical hand.
[0039] Further, in combination with Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 and Figure 7As shown, the lower mold plate 6 is provided with a first thin gas cavity 901, and the outlet end of the first gas blowing pipeline 801 communicates with the second product groove 601 through the first thin gas cavity 901. Specifically, the blowing insert 9 is embedded in the inside of the lower mold plate 6, part of the inner wall of the first thin gas cavity 901 is arranged on the outer surface of the blowing insert 9, and the outlet end of the first thin gas cavity 901 extends from one side of the second product groove 601 to the other side along the circumferential direction of the inner wall of the second product groove 601. In this way, the distribution of gas between the product 11 and the second product groove 601 can be more uniform, the stress on each part of the product 11 during the demolding process can be more consistent, and the deformation or damage of the product 11 caused by excessive local gas pressure can be avoided.
[0040] Further, the lower mold plate 6 is provided with a plurality of gas supplement cavities 902, specifically, part of the inner wall of the gas supplement cavity 902 is arranged on the outer surface of the blowing insert 9, and the first thin gas cavity 901 communicates with the outlet end of the first gas blowing assembly 8 through three gas supplement cavities 902. In this way, the distribution of gas pressure in the first thin gas cavity 901 can be more uniform, and the stress on each part of the product 11 during the demolding process can be more consistent.
[0041] Further, the width of the outlet end of the first thin gas cavity 901 is between 0.03mm and 0.1mm. The width here refers to the size of the outlet end of the first thin gas cavity 901 in the axial direction of the product 11. Within this width range, it can be ensured that the molten material will not enter the first thin gas cavity 901 from the product profile cavity, but the gas can enter the product profile cavity from the first thin gas cavity 901.
[0042] The working principle or working process of the present embodiment is as follows: Figures 1 to 7 As shown, when the mold is closed, the molten material enters the product profile cavity through the main runner 3 and wraps around the outer surfaces of the first core 4 and the second core 7; after the molten material in the product profile cavity cools and solidifies, the mold is opened, that is, the upper mold plate 2 is separated from the lower mold plate 6 under the drive of the external driving mechanism; at this time, the product 11 is adhered to the second product groove 601, the first gas blowing pipeline 801 immediately delivers gas to each gas supplement cavity 902, then flows to the first thin gas cavity 901 through the gas supplement cavity 902, and finally enters the second product groove 601 from the outlet end of the first thin gas cavity 901. The mutual adhesion between the product 11 and the inner wall of the second product groove 601 is reduced due to the entry of the gas, so that the product 11 can be more easily separated from the second product groove 601. Since the adhesion of the product 11 to the inner wall of the second product groove 601 is small, the mechanical hand can directly take out the product 11 from the second product groove 601 without using the ejector pin to eject the product 11.
[0043] The beneficial effects of the present embodiment are that the demolding process of the product does not require the participation of the ejector pin, the time for ejecting the product is saved, the production efficiency of the product is higher, and the cost of frequent maintenance of the ejector pin can be saved.
[0044] Embodiment 2
[0045] This embodiment is a second embodiment of the elbow pipe injection mold, which is similar to Embodiment 1, except that the second product slot 601 is arranged on the lower mold plate 6, and the first product slot 201 is arranged on the upper mold plate 2. Figures 1 to 3 As shown in FIG. 6, the upper mold plate 2 is provided with a second blowing assembly 10. Specifically, the second blowing assembly 10 includes a second blowing pipeline 1001, which is partially located inside the upper mold plate 2 and partially located outside the upper mold plate 2. The part of the second blowing pipeline 1001 located outside the upper mold plate 2 is provided with a second air inlet 1002. The second thin air cavity 602 is in communication with the second blowing pipeline 1001, and the second thin air cavity 602 is in communication with the semicircular groove 2012 in the clamped state. It can be understood that the first blowing assembly 8 blows air into the second product slot 601 at the same time, and the second blowing pipeline 1001 blows air into the semicircular groove 2012 through the second thin air cavity 602. In this way, the adhesion of the product 11 to the inner wall of the semicircular groove 2012 can be reduced, so that the product 11 can be smoothly separated from the first product slot 201 when the mold is opened, and the integrity of the product 11 is ensured.
[0046] The other features, working principles and beneficial effects of this embodiment are consistent with those of Embodiment 1.
[0047] Embodiment 3
[0048] This embodiment is a third embodiment of the elbow pipe injection mold, which is similar to Embodiment 2, except that the second product slot 601 is arranged on the lower mold plate 6, and the first product slot 201 is arranged on the upper mold plate 2. Figure 1 Figure 2 Figure 3 Figure 8 As shown in FIG. 8, the upper mold plate 2 is provided with 12 first product slots 201, and the lower mold plate 6 is provided with 12 second product slots 601. The first product slot 201 and the second product slot 601 are paired to form a product shape cavity. The first blowing pipeline 801 and the second blowing pipeline 1001 are each provided with a plurality of outlet ends. The outlet end of the first blowing pipeline 801 is in communication with the second product slot 601, and the outlet end of the second blowing pipeline 1001 is in communication with the first product slot 201. It can be understood that 12 product shape cavities can be formed when the mold is clamped, and 12 elbow pipe products 11 can be produced in one injection molding process, thereby improving the production efficiency of the product 11.
[0049] The other features, working principles and beneficial effects of this embodiment are consistent with those of Embodiment 2.
[0050] In the specific contents of the above specific embodiments, each technical feature can be combined arbitrarily without contradiction. In order to make the description simple, not all possible combinations of the above technical features are described, but as long as the combination of these technical features does not exist contradiction, it should be considered as the scope of the present disclosure.
[0051] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, on the basis of the above description, other different forms of changes or variations can be made, and all the implementation modes do not need to be exhausted here. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A bend pipe injection mold, comprising an upper mold and a lower mold, a main runner (3) is arranged on the upper mold or the lower mold, a first product groove (201) is arranged on the upper mold, and the first product groove (201) and a second product groove (601) enclose a product shape cavity in communication with the main runner (3) in a closed mold state; characterized in that, The lower mold is provided with a first blowing assembly (8), and an outlet end of the first blowing assembly (8) is communicated with the second product groove (601).
2. A bend pipe injection mold according to claim 1, characterized in that, The second product groove (601) has a smaller surface area than the first product groove (201).
3. A bend pipe injection mold according to claim 2, wherein The first product groove (201) comprises a whole-circle groove (2011) and a half-circle groove (2012) communicated with the whole-circle groove (2011), and an axis of the half-circle groove (2012) forms an angle with an axis of the whole-circle groove (2011); the whole-circle groove (2011), the half-circle groove (2012) and the second product groove (601) form the product contour cavity in a closed mold state.
4. A bend pipe injection mold according to claim 3, wherein The upper mold is provided with a second blowing assembly (10), and the lower mold is provided with a second thin gas cavity (602) communicated with an outlet end of the second blowing assembly (10), and the second thin gas cavity (602) is communicated with the half-circle groove (2012) in a closed mold state.
5. A molded elbow fitting according to claim 3 wherein: The axis of the whole-circle groove (2011) is in a vertical direction.
6. A molded elbow fitting according to claim 2 wherein, The lower mold is provided with a first thin gas cavity (901), and an outlet end of the first blowing assembly (8) is communicated with the second product groove (601) through the first thin gas cavity (901), and the outlet end of the first thin gas cavity (901) extends from one side of the second product groove (601) to the other side along a circumferential direction of an inner wall of the second product groove (601).
7. A bend pipe injection mold according to claim 6, wherein The lower mold is provided with a plurality of air supplement cavities (902), and the first thin gas cavity (901) is communicated with the outlet end of the first blowing assembly (8) through the air supplement cavities (902).
8. A bend pipe injection mold according to claim 6, wherein The outlet end of the first thin gas cavity (901) has a width of 0.03mm to 0.1mm.
9. A bend pipe injection mold according to any one of claims 6 to 8, characterized in that, The upper mold is provided with a plurality of first product grooves (201), and the lower mold is provided with a plurality of second product grooves (601), and the first product grooves (201) and the second product grooves (601) are paired one by one to form one product contour cavity, and the product contour cavities are all communicated with the outlet end of the first blowing assembly (8).
10. A bend pipe injection mold according to claim 9, wherein The first blowing assembly (8) comprises a first blowing pipeline (801), and the first blowing pipeline (801) is provided with a first air inlet nozzle (802), the first air inlet nozzle (802) is located outside the lower mold, and the first thin gas cavities (901) are all communicated with the first blowing pipeline (801).