Injection mold for pipe fitting joint

Abstract

The utility model relates to the technical field of injection molds, in particular to an injection mold of a pipe fitting joint, which comprises a front mold and a rear mold, and the front mold comprises a front mold core assembly and a first mold core; the rear mold comprises a bottom plate assembly, a push plate assembly, an ejector pin, a rear mold core assembly and a second mold core; the front mold core assembly is connected with an inclined guide column; the rear mold core assembly comprises a fixed block and a sliding block, and an inclined guide cavity is formed in the sliding block; and in a mold closing state, a cavity is formed among the front mold core assembly, the sliding block and the fixed block, and a runner communicated with the cavity is formed between the sliding block and the fixed block. The rear mold core assembly is divided into the fixed block and the sliding block, and the sliding block can firstly slide to be separated from a product during mold opening, so that the area of the product adhered to the rear mold core assembly is reduced, and the demolding resistance of the product is reduced; and then the ejector pin is used for jacking up the water gap connected with the product, so that the product is jacked up. As the ejector pin is not contacted with the product, ejector pin marks can be prevented from being left on the surface of the product.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and more specifically, to an injection mold for a pipe fitting joint. Background Technology

[0002] PPR straight thread connectors are used for connecting pipes. These connectors mainly consist of a stainless steel insert and a PPR outer shell that surrounds the stainless steel insert. Currently, PPR straight thread connectors are primarily manufactured using injection molds. During production, the stainless steel insert is placed inside the injection mold, and PPR material is then injected onto the outside of the stainless steel insert to obtain the PPR straight thread connector product.

[0003] The prior art discloses an injection mold and molding method for molding in-mold inserts. The injection mold includes a front mold core and a rear mold core, which form an injection cavity for molding the injection molded part. The rear mold core also has a rear mold core through hole for placing hardware, and the rear mold core through hole is connected to the injection cavity. During molding, one end of the hardware is placed in the injection cavity to be enclosed in the injection molded part, and the other end of the hardware is located in the rear mold core through hole, which is the end exposed in the injection molded part. The front mold core has a front mold core through hole, which is connected to the injection cavity. A movable front mold ejector pin is provided in the front mold core through hole, which is used to hold the hardware during injection molding.

[0004] In the above technical solution, during demolding, the rear mold ejector pin holds the product and then lifts the product out of the cavity, thereby achieving demolding. However, because the outer circumferential surface of the product is completely in contact with the inner circumferential wall of the cavity, the demolding resistance of the product is relatively large. The rear mold ejector pin needs to apply a large pushing force to lift the product, resulting in ejector pin marks always being left on the product surface, which seriously affects the appearance quality of the product. Utility Model Content

[0005] In view of the problem that ejector pins leave ejector pin marks on the product surface after lifting the product in the prior art, this utility model provides an injection mold for pipe fittings that can leave ejector pin marks on the product surface.

[0006] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0007] An injection mold for a pipe fitting connector includes a front mold and a rear mold. The front mold includes a front mold core assembly and a first core. The front mold core assembly has a feed port and an insert slot. The first core is connected to the front mold core assembly and at least a portion of it is located within the insert slot. The rear mold includes a base plate assembly, a push plate assembly, an ejector pin, a rear mold core assembly, and a second core. The push plate assembly is slidably connected to the base plate assembly in a vertical direction. The ejector pin is connected to the push plate assembly and slidably connected to the base plate assembly in a vertical direction. The second core is connected to the base plate assembly. In the mold-closed state, a cavity is formed between the front mold core assembly and the rear mold core assembly. Further, the front mold... The core assembly is connected to an inclined guide post; the rear core assembly includes a fixed block and a slider, the fixed block being connected to the base plate assembly; the slider is located on one side of the fixed block and is slidably connected to the base plate assembly in the horizontal direction, the slider is provided with an inclined guide cavity, the top center of the inclined guide cavity being closer to the fixed block than its bottom center; in the mold closed state, the cavity is formed between the front core assembly, the slider and the fixed block, a flow channel communicating with the cavity is formed between the slider and the fixed block, the flow channel communicating with the feed port, the portion of the inclined guide post protruding from the front core assembly extending into the inclined guide cavity; the end of the ejector pin can extend into the flow channel.

[0008] In the implementation of the above technical solution, one end of the stainless steel insert is first inserted into the insert slot, while the other end is exposed outside the front mold core assembly. Then, the front mold and the rear mold are closed, allowing the exposed end of the stainless steel insert to enter the cavity. At this time, the end of the second core located in the cavity extends into the inner cavity of the stainless steel insert. Then, molten material is injected into the feed port, and the molten material enters the cavity through the runner. After the molten material in the cavity cools and solidifies, the front mold core assembly moves upward, causing the first core and the inclined guide post to move upward together. During this process, the inclined guide post applies a horizontal component force to the inner wall of the inclined guide cavity. This component force causes the slider to slide away from the fixed block and detach from the product, thus exposing a portion of the product's area. After the slider completely detaches from the product, the push plate assembly pushes the ejector pin upward. The ejector pin lifts the sprue connected to the product, thereby lifting the product and detaching it from the fixed block, thus completing the demolding of the product. During the next mold closing, the front mold core assembly moves downward, and the angled guide post can extend into the angled guide cavity. As the angled guide post gradually moves downward, the slider also gradually approaches the fixed block until it fits against the fixed block.

[0009] The above technical solution involves setting a portion of the inner wall of the cavity and a portion of the inner wall of the runner on a fixed block, while setting a portion of the inner wall on a slider. During mold opening, the slider can detach from the product first, leaving only a small area of ​​the product adhering to the inner wall of the cavity, thus reducing subsequent demolding resistance. Because the demolding resistance is low during subsequent demolding, the ejector pins can lift the product by ejecting the sprue. Since the ejector pins do not directly contact the product, there are no ejector pin marks on the product surface, thereby improving the product's appearance quality.

[0010] Preferably, the front mold core assembly is provided with a limiting block, the limiting block has a first inclined surface, and the axis of the inclined guide post is parallel to the first inclined surface; the slider has a second inclined surface. In the mold-closed state, the slider is located between the fixed block and the limiting block, and the second inclined surface is in contact with the first inclined surface. When the mold opens, the limiting block moves upward with the front mold core assembly, and the slider also slides under the push of the inclined guide post, with the first and second inclined surfaces remaining in contact until the limiting block separates from the slider. When the mold closes, the first and second inclined surfaces remain in contact, and as the second inclined surface moves downward, it applies a horizontal component force to the first inclined surface, which pushes the slider towards the fixed block. The limiting block plays a guiding role in the sliding of the slider, making the slider slide more smoothly and avoiding damage to the product when it detaches from the product due to uneven sliding. Moreover, the limiting block can improve the positional accuracy of the slider in the mold-closed state.

[0011] Preferably, the base plate assembly is provided with a positioning groove, and the limiting block is provided with a protrusion. In the mold-closed state, the protrusion engages with the positioning groove. The positioning groove and protrusion allow the slider 9 to be positioned more accurately in the mold-closed state, which helps improve the molding precision and quality of the product.

[0012] Preferably, the base plate assembly includes a base, a B-plate, and a guide plate. The push plate assembly is slidably connected to the base in the vertical direction. The B-plate is located between the guide plate and the base and is connected to the base. The second core is fixedly connected to the B-plate and slidably connected to the guide plate in the vertical direction. The slider is slidably connected to the guide plate in the horizontal direction. During mold opening, the front mold core assembly moves upward until it disengages from the fixed block and the slider. The guide plate remains stationary, while the base and B-plate move downward, thereby causing the second core to move downward a certain distance, allowing the second core to detach from the product. Then, the ejector pin pushes upward again. It can be understood that the first parting surface of the mold is between the front mold core assembly and the fixed block, and the second parting surface is between the guide plate and the B-plate. Setting a second parting surface allows the second core to be extracted from the product first, which can further reduce the subsequent demolding resistance of the product.

[0013] Preferably, in the mold-closed state, at least two cavities are formed between the front mold core assembly, the fixing block, and the slider, and the runner communicates with at least two cavities. The front mold core assembly is provided with at least two insert slots and first cores corresponding one-to-one with each cavity, that is, one cavity corresponds to one insert slot and one first core. The base plate assembly is provided with at least two second cores corresponding one-to-one with the first cores, that is, one second core corresponds to one first core. It can be understood that this arrangement allows at least two products to be obtained after one injection molding, which is beneficial to improving product production efficiency.

[0014] Preferably, the front mold core assembly has at least two inclined guide pillars, and the slider has at least two inclined guide cavities that correspond one-to-one with the inclined guide pillars, that is, one inclined guide pillar corresponds to one inclined guide cavity. Providing at least two inclined guide pillars can reduce the burden on a single inclined guide pillar, which helps extend the service life of the inclined guide pillars and improves the smoothness of the slider's sliding.

[0015] Preferably, there are two sliders, located on opposite sides of the fixed block; the inclined guide pillars, ejector pins, first core, and second core are also correspondingly provided, meaning the number of inclined guide pillars, ejector pins, first core, and second core increases accordingly with the number of sliders. During mold opening, the two sliders slide away from the fixed block; during mold closing, the two sliders slide closer to the fixed block. Using two sliders allows for more products to be obtained in a single injection molding process, thereby further improving production efficiency.

[0016] Preferably, the axis of the gate of the runner is perpendicular to the axis of the cavity, that is, the flow direction of the molten material flowing out of the gate of the runner is perpendicular to the axis of the cavity. This arrangement allows the molten material to be distributed more evenly during the filling of the cavity, thereby reducing defects such as depressions and burrs caused by uneven molten material flow.

[0017] Preferably, the gate of the runner is located at the position with the largest diameter of the cavity, which is also the position with the largest product thickness. Setting the gate of the runner at this position can ensure that the molten material has sufficient pressure and volume to fill the entire cavity, avoiding insufficient or uneven filling of the molten material.

[0018] Preferably, the end of the inclined guide post is provided with a hemispherical part. The hemispherical part can better guide the inclined guide post into the inclined guide cavity during mold closing, so that the inclined guide post can smoothly enter the inclined guide cavity. Moreover, the hemispherical part can reduce the friction between the end of the inclined guide post and the inner wall of the inclined guide cavity.

[0019] The beneficial effects of this utility model are as follows: the rear mold core assembly is divided into a fixed block and a slider. When the mold is opened, the slider can slide to detach from the product first, thereby reducing the adhesion area of ​​the product on the rear mold core assembly and thus reducing the demolding resistance of the product; then the ejector pin lifts the product by lifting the sprue connected to the product, thereby avoiding contact between the ejector pin and the product and thus avoiding leaving ejector pin marks on the product surface. Attached Figure Description

[0020] Figure 1 This is a frontal sectional view of an injection mold for a pipe fitting.

[0021] Figure 2 yes Figure 1 A magnified schematic diagram of part A in the middle;

[0022] Figure 3 This is a sectional view from the side of an injection mold for a pipe fitting; some section lines are not shown, and the arrows point to the parting direction of the mold.

[0023] Figure 4 yes Figure 2 A magnified schematic diagram of part B in the middle; where the arrows point in the direction of molten material flow;

[0024] Figure 5 This is a schematic diagram of the structure of an injection mold for a pipe fitting connector after the mold has been opened and before the product has been demolded.

[0025] Figure 6 yes Figure 5 A magnified schematic diagram of part C in the middle;

[0026] Figure 7 This is a schematic diagram of the structure of a pipe fitting after demolding from an injection mold.

[0027] Figure 8 yes Figure 7 A magnified schematic diagram of part D in the middle.

[0028] In the attached diagram: 1-Front mold core assembly; 101-Insert slot; 2-First core; 3-Base plate assembly; 301-Base; 302-B plate; 303-Guide plate; 3031-Positioning slot; 4-Push plate assembly; 5-Ejector pin; 6-Second core; 7-Angled guide post; 701-Hemisphere; 8-Fixing block; 801-Cavity; 802-Runner; 803-Gate; 9-Slider; 901-Angled guide cavity; 902-Second inclined surface; 10-Limiting block; 1001-First inclined surface; 1002-Protrusion; 11-Stainless steel insert; 12-Product. Detailed Implementation

[0029] 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.

[0030] 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.

[0031] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0032] Example 1

[0033] This embodiment is a first embodiment of an injection mold for a pipe fitting joint, combined with... Figures 1 to 8As shown, it includes a front mold and a rear mold. The front mold includes a front mold core assembly 1 and a first core 2. The front mold core assembly 1 is provided with a feed port (not shown in the figure) and an insert slot 101. The first core 2 is connected to the front mold core assembly 1 and a portion of it is located in the insert slot 101. The rear mold includes a base plate assembly 3, a push plate assembly 4, an ejector pin 5, a rear mold core assembly, and a second core 6. The push plate assembly 4 and the base plate assembly 3 are slidably connected in the vertical direction. The ejector pin 5 is connected to the push plate assembly 4 and is slidably connected to the base plate assembly 3 in the vertical direction. The second core 6 is connected to the base plate assembly 3. In the mold closed state, a cavity 801 is formed between the front mold core assembly 1 and the rear mold core assembly. Furthermore, the front mold core assembly 1 is connected to the inclined guide post 7; the rear mold core assembly includes a fixed block 8 and a slider 9, the fixed block 8 is connected to the base plate assembly 3; the slider 9 is located on one side of the fixed block 8 and is slidably connected to the base plate assembly 3 in the horizontal direction, the slider 9 is provided with an inclined guide cavity 901, the top center of the inclined guide cavity 901 is closer to the fixed block 8 than its bottom center; in the mold closed state, a cavity 801 is formed between the front mold core assembly 1, the slider 9 and the fixed block 8, and a flow channel 802 communicating with the cavity 801 is formed between the slider 9 and the fixed block 8, the flow channel 802 is connected with the feed port, and the part of the inclined guide post 7 protruding from the front mold core assembly 1 extends into the inclined guide cavity 901; the fixed block 8 is provided with a through port 803, the through port 803 is connected with the flow channel 802, and the end of the ejector pin 5 can extend into the flow channel 802 through the through port 803.

[0034] Furthermore, the axis of the gate of the runner 802 is perpendicular to the axis of the cavity 801, meaning that the flow direction of the molten material flowing out of the gate of the runner 802 is perpendicular to the axis of the cavity 801. This arrangement allows the molten material to be distributed more evenly during the filling of the cavity 801, thereby reducing defects such as depressions and burrs caused by uneven molten material flow.

[0035] Furthermore, the gate of runner 802 is located at the position where the cavity 801 has the largest diameter and is close to the bottom of the stainless steel insert 11. This position is where the product 12 has the greatest thickness. Setting the gate of runner 802 at this position ensures that the molten material has sufficient pressure and volume to fill the entire cavity 801, avoiding insufficient or uneven filling. Since the stainless steel insert 11 will be slightly misaligned after being installed into the insert slot 101, setting the gate at this position allows the molten material to push the stainless steel insert 11 when it enters the cavity 801 from runner 802, forcing the stainless steel insert 11 to adjust to the correct position, which helps improve the shape and dimensional accuracy of the product.

[0036] Furthermore, the end of the inclined guide post 7 is provided with a hemispherical part 701. The hemispherical part 701 can better guide the inclined guide post 7 into the inclined guide cavity 901 during mold closing, so that the inclined guide post 7 can smoothly enter the inclined guide cavity 901. Moreover, the hemispherical part 701 can reduce the friction between the end of the inclined guide post 7 and the inner wall of the inclined guide cavity 901.

[0037] The working principle or workflow of this embodiment is as follows: First, one end of the stainless steel insert 11 is inserted into the insert slot 101, while the other end is exposed outside the front mold core assembly 1. Then, the front mold and rear mold are closed, allowing the exposed end of the stainless steel insert 11 to enter the cavity 801. At this time, the end of the second core 6 located within the cavity 801 extends into the inner cavity of the stainless steel insert 11. Then, molten material is injected into the feed port, and the molten material enters the cavity 801 through the flow channel 802. After the molten material in the cavity 801 cools and solidifies, the front mold core assembly 1 moves upwards... The first core 2 and the inclined guide post 7 move upward together. During this process, the inclined guide post 7 applies a horizontal component force to the inner wall of the inclined guide cavity 901. This component force causes the slider 9 to slide away from the fixed block 8, thus disengaging from the product 12 and exposing a portion of the product 12. After the slider 9 is completely disengaged from the product 12, the push plate assembly 4 pushes the ejector pin 5 to slide upward. The ejector pin 5 passes through the through-hole 803 and lifts the sprue connected to the product 12, thereby lifting the product 12 until it is disengaged from the fixed block 8, thus completing the demolding of the product 12. During the next mold closing, the front mold core assembly 1 moves downward, and the inclined guide post 7 can extend into the inclined guide cavity 901. As the inclined guide post 7 gradually moves downward, the slider 9 also gradually approaches the fixed block 8 until it is in contact with the fixed block 8.

[0038] The above technical solution involves setting a portion of the inner wall of the cavity 801 and a portion of the inner wall of the runner 802 on the fixed block 8, and a portion of the inner wall on the slider 9. During mold opening, the slider 9 can first detach from the product 12, leaving only a small portion of the product 12 adhering to the inner wall of the cavity 801, thereby reducing the subsequent demolding resistance of the product 12. Because the demolding resistance of the product 12 is relatively small during subsequent demolding, the ejector pin 5 can lift the product 12 by lifting the sprue. Since the ejector pin 5 does not directly contact the product 12, there will be no ejector pin marks on the surface of the product 12, thus improving the appearance quality of the product 12.

[0039] The beneficial effects of this embodiment are as follows: the rear mold core assembly is divided into a fixed block and a slider. When the mold is opened, the slider can slide to detach from the product first, thereby reducing the adhesion area of ​​the product on the rear mold core assembly and thus reducing the demolding resistance of the product; then the ejector pin lifts the product by lifting the sprue connected to the product, thereby avoiding contact between the ejector pin and the product and thus avoiding leaving ejector pin marks on the product surface.

[0040] Example 2

[0041] This embodiment is a second embodiment of an injection mold for a pipe fitting joint. This embodiment is similar to Embodiment 1, except that it combines... Figures 1 to 8As shown, the front mold core assembly 1 is provided with a limiting block 10, and the limiting block 10 is provided with a first inclined surface 1001. The axis of the inclined guide post 7 is parallel to the first inclined surface 1001. The slider 9 is provided with a second inclined surface 902. In the mold closed state, the slider 9 is located between the fixed block 8 and the limiting block 10, and the second inclined surface 902 is in contact with the first inclined surface 1001. When the mold opens, the limiting block 10 moves upward with the front mold core assembly 1, and the slider 9 also slides under the push of the inclined guide post 7, and the first inclined surface 1001 and the second inclined surface 902 remain in contact until the limiting block 10 and the slider 9 separate. When the mold closes, the first inclined surface 1001 and the second inclined surface 902 remain in contact. During the downward movement of the second inclined surface 902, a horizontal component force is applied to the first inclined surface 1001, which pushes the slider 9 towards the fixed block 8. The limiting block 10 guides the sliding of the slider 9, making its sliding smoother and preventing damage to the product 12 when it detaches from the product 12 due to uneven sliding. Furthermore, the limiting block 10 improves the positional accuracy of the slider 9 in the mold-closed state.

[0042] Furthermore, the base plate assembly 3 is provided with a positioning slot 3031, and the limiting block 10 is provided with a protrusion 1002. In the mold-closed state, the protrusion 1002 engages with the positioning slot 3031. The positioning slot 3031 and the protrusion 1002 can make the position of the slider 9 more accurate in the mold-closed state, which is beneficial to improving the molding accuracy and quality of the product 12.

[0043] Specifically, the base plate assembly 3 includes a base 301, a B plate 302, and a guide plate 303. The push plate assembly 4 is slidably connected to the base 301 in the vertical direction. The B plate 302 is located between the guide plate 303 and the base 301 and is connected to the base 301. The second core 6 is fixedly connected to the B plate 302 and slidably connected to the guide plate 303 in the vertical direction. The slider 9 is slidably connected to the guide plate 303 in the horizontal direction. During mold opening, the front mold core assembly 1 moves upward until it disengages from the fixed block 8 and the slider 9. The guide plate 303 remains stationary, while the base 301 and the B plate 302 move downward, thereby causing the second core 6 to move downward a certain distance, causing the second core 6 to disengage from the product 12. Then, the ejector pin 5 pushes upward again. It can be understood that the first parting surface of the mold is between the front mold core assembly 1 and the fixed block 8, and the second parting surface is between the guide plate 303 and the B plate 302. Setting a second parting surface allows the second core 6 to be pulled out of the product 12 first, which can further reduce the subsequent demolding resistance of the product 12.

[0044] Other features, working principles, and beneficial effects of this embodiment are the same as those of Embodiment 1.

[0045] Example 3

[0046] This embodiment is a third embodiment of an injection mold for a pipe fitting joint. This embodiment is similar to embodiment 2, except that it combines... Figures 1 to 8 As shown, in the mold-closed state, four cavities 801 are formed between the front mold core assembly 1, the fixing block 8, and a slider 9. Two flow channels are formed between the fixing block 8 and the slider 9, and every two cavities 801 are connected to one flow channel 802. The front mold core assembly 1 is provided with insert slots 101 and first cores 2 that correspond one-to-one with the cavities 801, that is, one cavity 801 corresponds to one insert slot 101 and one first core 2. The base plate assembly 3 is provided with second cores 6 that correspond one-to-one with the first cores 2, that is, one second core 6 corresponds to one first core 2.

[0047] Furthermore, two sliders 9 are provided, located on opposite sides of the fixed block 8; the inclined guide pillars 7, ejector pins 5, first core 2, and second core 6 are also correspondingly provided, meaning the number of inclined guide pillars 7, ejector pins 5, first core 2, and second core 6 increases accordingly with the increase of sliders 9. During mold opening, the two sliders 9 slide away from the fixed block 8 on both sides; during mold closing, the two sliders 9 slide towards the fixed block 8 on both sides. Using two sliders 9 allows for more products 12 to be obtained in a single injection molding process, thereby further improving production efficiency.

[0048] Furthermore, the front mold core assembly 1 is provided with four inclined guide pillars 7, and each slider 9 is provided with two inclined guide cavities 901 that correspond one-to-one with the inclined guide pillars 7. That is, one slider 9 is paired with two inclined guide pillars 7, and one inclined guide pillar 7 is paired with one inclined guide cavity 901. Setting two inclined guide pillars 7 to cooperate with one slider 9 can reduce the burden on a single inclined guide pillar 7, which is beneficial to extending the service life of the inclined guide pillars 7, and can also improve the smoothness of the slider 9's sliding.

[0049] Other features, working principles, and beneficial effects of this embodiment are the same as those of Embodiment 2.

[0050] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0051] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description, and it is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An injection mold for a pipe fitting connector, comprising a front mold and a rear mold, wherein the front mold comprises a front mold core assembly (1) and a first core (2), the front mold core assembly (1) having a feed port and an insert slot (101), the first core (2) being connected to the front mold core assembly (1) and having at least a portion therein located within the insert slot (101); the rear mold comprises a base plate assembly (3), a push plate assembly (4), an ejector pin (5), a rear mold core assembly and a second core (6); the push plate assembly (4) being slidably connected to the base plate assembly (3) in a vertical direction; the ejector pin (5) being connected to the push plate assembly (4) and slidably connected to the base plate assembly (3) in a vertical direction; the second core (6) being connected to the base plate assembly (3); and a cavity (801) being formed between the front mold core assembly (1) and the rear mold core assembly in a closed state; characterized in that, The front mold core assembly (1) is connected to an inclined guide post (7); the rear mold core assembly includes a fixed block (8) and a slider (9), the fixed block (8) is connected to the base plate assembly (3); the slider (9) is located on one side of the fixed block (8) and is slidably connected to the base plate assembly (3) in the horizontal direction, the slider (9) is provided with an inclined guide cavity (901), the top center of the inclined guide cavity (901) is closer to the fixed block (8) than its bottom center; in the mold closing state The cavity (801) is formed between the front mold core assembly (1), the slider (9) and the fixed block (8). A flow channel (802) communicating with the cavity (801) is formed between the slider (9) and the fixed block (8). The flow channel (802) is communicating with the feed port. The portion of the inclined guide post (7) protruding from the front mold core assembly (1) extends into the inclined guide cavity (901). The end of the ejector pin (5) can extend into the flow channel (802).

2. The injection mold for a pipe fitting joint according to claim 1, characterized in that, The front mold core assembly (1) is provided with a limiting block (10), the limiting block (10) is provided with a first inclined surface (1001), and the axis of the inclined guide post (7) is parallel to the first inclined surface (1001); the slider (9) is provided with a second inclined surface (902). In the mold closing state, the slider (9) is located between the fixing block (8) and the limiting block (10), and the second inclined surface (902) is in contact with the first inclined surface (1001).

3. The injection mold for a pipe fitting joint according to claim 2, characterized in that, The base plate assembly (3) is provided with a positioning slot (3031), and the limiting block (10) is provided with a protrusion (1002). In the mold closing state, the protrusion (1002) engages with the positioning slot (3031).

4. The injection mold for a pipe fitting joint according to claim 1, characterized in that, The base plate assembly (3) includes a base (301), a B plate (302), and a guide plate (303). The push plate assembly (4) is slidably connected to the base (301) in the vertical direction. The B plate (302) is located between the guide plate (303) and the base (301) and is connected to the base (301). The second core (6) is fixedly connected to the B plate (302) and slidably connected to the guide plate (303) in the vertical direction. The slider (9) is slidably connected to the guide plate (303) in the horizontal direction.

5. The injection mold for a pipe fitting joint according to claim 1, characterized in that, In the mold-closed state, at least two cavities (801) are formed between the front mold core assembly (1), the fixing block (8) and the slider (9), and the flow channel (802) is connected to at least two cavities (801); the front mold core assembly (1) is provided with at least two insert slots (101) and a first core (2) corresponding to the cavities (801), and the base plate assembly (3) is provided with at least two second cores (6) corresponding to the first cores (2).

6. The injection mold for a pipe fitting joint according to claim 5, characterized in that, The front mold core assembly (1) is provided with at least two inclined guide pillars (7), and the slider (9) is provided with at least two inclined guide cavities (901) that correspond one-to-one with the inclined guide pillars (7).

7. The injection mold for a pipe fitting joint according to claim 1, characterized in that, Two sliders (9) are provided and are located on opposite sides of the fixed block (8); the inclined guide post (7), the ejector pin (5), the first core (2) and the second core (6) are all provided accordingly.

8. The injection mold for a pipe fitting joint according to claim 1, characterized in that, The axis of the gate of the flow channel (802) is perpendicular to the axis of the cavity (801).

9. The injection mold for a pipe fitting joint according to claim 8, characterized in that, The gate of the flow channel (802) is located at the position where the diameter of the cavity (801) is the largest.

10. An injection mold for a pipe fitting joint according to any one of claims 1 to 9, characterized in that, The inclined guide post (7) has a hemispherical part (701) at its end.

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