CN223493784U - Injection mold for pipe fitting joint - Google Patents

Abstract

The utility model relates to the technical field of injection molds, in particular to an injection mold for a pipe fitting joint, which comprises a front mold and a rear mold, wherein 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, a thimble, a rear mold core assembly and a second mold core, the front mold core assembly is connected with an inclined guide pillar, the rear mold core assembly comprises a fixed block and a sliding block, an inclined guide cavity is arranged on the sliding block, a cavity is formed among the front mold core assembly, the sliding block and the fixed block in a mold clamping state, and a runner communicated with the cavity is formed among the sliding block and the fixed block. The utility model divides the rear mould core assembly into the fixed block and the sliding block, the sliding block can slide to be separated from the product when the mould is opened, so that the area of the product adhered on the rear mould core assembly is reduced, the demoulding resistance of the product is reduced, and then the ejector pin is utilized to jack up a water gap connected with the product, thereby jacking up the product. Because the thimble is not contacted with the product, the thimble mark can be prevented from being left on the surface of the product.

Description

Injection mold for pipe fitting joint

Technical Field

The utility model relates to the technical field of injection molds, in particular to an injection mold for a pipe fitting joint.

Background

The PPR straight thread joint is used for connecting pipe fittings, and mainly consists of a stainless steel insert and a PPR shell wrapped outside the stainless steel insert. At present, the PPR straight threaded joint is mainly produced through an injection mold, and during production, a stainless steel insert is placed into the injection mold, and PPR materials are injected outside the stainless steel insert to obtain a PPR straight threaded joint product.

The prior art discloses an injection mold for molding an insert and a molding method, wherein the injection mold comprises a front mold core and a rear mold core, an injection molding cavity for molding an injection molding piece is formed between the front mold core and the rear mold core, a rear mold core through hole for placing hardware is further formed in the rear mold core, the rear mold core through hole is communicated with the injection molding cavity, one end of the hardware is placed in the injection molding cavity and is used for being wrapped in the injection molding piece during molding, the other end of the hardware is located in the rear mold core through hole and is exposed out of one end of the injection molding piece, the front mold core is provided with a front mold core through hole, the front mold core through hole is communicated with the injection molding cavity, a movable front mold ejector pin is arranged in the front mold core through hole, and the front mold ejector pin is used for ejecting the hardware during injection molding.

In the technical scheme, when demolding is performed, the rear mold ejector pin pushes against the product, and then the product pushes against the cavity, so that demolding of the product is realized. However, because the outer circumference of the product is completely attached to the inner circumference of the cavity, the demolding resistance of the product is large, and the rear mold ejector pin can eject the product only by applying large thrust to the product, so that the ejector pin mark is always left on the surface of the product, and the appearance quality of the product is seriously affected.

Disclosure of utility model

Aiming at the problem that in the prior art, a thimble mark is left on the surface of a product after the thimble jacks up the product, the utility model provides an injection mold for a pipe fitting joint, which can leave the thimble mark on the surface of the product.

In order to solve the technical problems, the technical scheme provided by the utility model is as follows:

The injection mold for the pipe fitting joint comprises a front mold and a rear mold, wherein the front mold comprises a front mold core component and a first core, a feed inlet and an insert clamping groove are formed in the front mold core component, the first core is connected with the front mold core component and is at least partially located in the insert clamping groove, the rear mold comprises a bottom plate component, a push plate component, a thimble, a rear mold core component and a second core, the push plate component is connected with the bottom plate component in a sliding mode along the vertical direction, the thimble is connected with the push plate component in a sliding mode along the vertical direction, the second core is connected with the bottom plate component in a sliding mode, a cavity is formed between the front mold core component and the rear mold core component in a mold clamping mode, further, the front mold core component is connected with an inclined guide pillar, the rear mold core component comprises a fixed block and a sliding block, the fixed block is connected with the bottom plate component, one side of the fixed block is connected with the bottom plate component in a sliding mode along the horizontal direction, the sliding block is provided with a guide cavity, the inclined guide pillar is further connected with the inclined guide pillar and the inclined guide pillar is formed between the front mold core component and the bottom plate component in a sliding mode, the inclined guide pillar is connected with the inclined guide pillar and the inclined guide pillar is formed in a mode of the inclined guide pillar and the inclined guide pillar is connected with the inclined guide pillar.

When the technical scheme is implemented, one end of the stainless steel insert is clamped into the insert clamping groove, the other end of the stainless steel insert is exposed out of the front die core assembly, then the front die and the rear die are clamped, one end of the stainless steel insert exposed out of the front die core assembly enters the cavity, at the moment, one end of the second core in the cavity stretches into the inner cavity of the stainless steel insert, then molten material is injected into the feeding port, the molten material enters the cavity through the runner, after the molten material in the cavity is cooled and solidified, the front die core assembly moves upwards, the first core and the inclined guide post move upwards together, in the process, the inclined guide post can apply a horizontal component force to the inner wall of the inclined guide cavity, the component force enables the sliding block to slide away from the fixed block so as to separate from the product, a part of the area of the product is exposed out, and after the sliding block is completely separated from the product, the push plate assembly pushes the ejector pin to slide upwards, and the ejector pin is used for ejecting the product from the fixed block through jacking the product, so that the product is separated from the fixed block, and demolding of the product is completed. When the front die core assembly moves downwards in the next die assembly, the inclined guide pillar can extend into the inclined guide cavity, and the sliding block gradually approaches the fixed block along with the gradual downward movement of the inclined guide pillar until the sliding block is attached to the fixed block.

According to the technical scheme, the part of the inner wall of the cavity and the part of the inner wall of the runner are arranged on the fixed block, the part of the inner wall is arranged on the sliding block, and the sliding block can be separated from a product during mold opening, so that only a small part of area of the product is left to be adhered on the inner wall of the cavity, and the subsequent demolding resistance of the product is reduced. Because the demolding resistance of the product is smaller in the subsequent demolding, the ejector pin can jack up the product by jacking up the water gap, and because the ejector pin is not in direct contact with the product, the surface of the product is not provided with ejector pin marks, and the appearance quality of the product can be improved.

The front die core assembly is characterized in that a limiting block is arranged on the front die core assembly, a first inclined plane is arranged on the limiting block, the axis of the inclined guide post is parallel to the first inclined plane, a second inclined plane is arranged on the sliding block, and in a die assembly state, the sliding block is located between the fixed block and the limiting block and is attached to the first inclined plane. When the die is opened, the limiting block moves upwards along with the front die core assembly, the sliding block also slides under the pushing of the inclined guide post, and the first inclined surface and the second inclined surface are kept attached until the limiting block is separated from the sliding block. When the die is assembled, the first inclined plane is kept in fit with the second inclined plane, and a horizontal component force is applied to the first inclined plane in the process of downward movement of the second inclined plane, and the horizontal component force pushes the sliding block to the fixed block. The limiting block plays a certain guiding role on sliding of the sliding block, so that sliding of the sliding block is stable, and damage to a product caused by unstable sliding of the sliding block when the sliding block is separated from the product is avoided. And the limiting block can improve the position accuracy of the sliding block in the die assembly state.

Preferably, a positioning clamping groove is formed in the bottom plate assembly, a protrusion is arranged on the limiting block, and the protrusion is clamped with the positioning clamping groove in a die clamping state. The positioning clamping groove and the bulge are arranged, so that the position of the sliding block 9 in the die assembly state is more accurate, and the molding precision and quality of products are improved.

Preferably, the bottom plate assembly comprises a base, a B plate and a guide plate, the push plate assembly is in sliding connection with the base along the vertical direction, the B plate is located between the guide plate and the base and is connected with the base, the second core is fixedly connected with the B plate and is in sliding connection with the guide plate along the vertical direction, and the sliding block is in sliding connection with the guide plate along the horizontal direction. When the die is opened, the front die core assembly moves upwards to be separated from the fixed block and the sliding block, the guide plate is kept motionless, the base and the B plate move downwards, the second die core is driven to move downwards for a certain distance, the second die core is separated from a product, and then the ejector pin is jacked upwards. It will be appreciated that the first parting plane of the die is between the front die core assembly and the fixed block and the second parting plane is between the guide plate and the B plate. The second parting surface is arranged to enable the second mold core to be firstly pulled away from the product, so that the subsequent demolding resistance of the product can be further reduced.

Preferably, in the mold closing state, at least two mold cavities are formed between the front mold core assembly, the fixed block and the sliding block, the runner is communicated with the at least two mold cavities, at least two insert clamping grooves and a first mold core which are in one-to-one correspondence with the mold cavities are formed in the front mold core assembly, namely one mold cavity corresponds to one insert clamping groove and one first mold core, and at least two second mold cores which are in one-to-one correspondence with the first mold cores, namely one second mold core corresponds to one first mold core are formed in the bottom plate assembly. It can be appreciated that the arrangement can obtain at least two products after one injection molding, which is beneficial to improving the production efficiency of the products.

Preferably, the front mold core assembly is provided with at least two inclined guide posts, and the sliding block is provided with at least two inclined guide cavities corresponding to the inclined guide posts one by one, namely, one inclined guide post is correspondingly matched with one inclined guide cavity. The arrangement of at least two inclined guide posts can reduce the burden of a single inclined guide post, is beneficial to prolonging the service life of the inclined guide posts, and can improve the sliding stability of the sliding block.

The inclined guide post, the ejector pin, the first core and the second core are correspondingly arranged, namely the inclined guide post, the ejector pin, the first core and the second core are correspondingly increased according to the increase of the sliding blocks. In the mold opening process, the two sliding blocks respectively slide to two sides far away from the fixed block, and in the mold closing process, the two sliding blocks respectively slide to the directions close to the fixed block. The two sliding blocks are arranged, so that more products can be obtained after one-time injection molding, and the production efficiency is further improved.

Preferably, the axis of the gate of the runner is perpendicular to the axis of the cavity, i.e. the flow direction of the melt as it flows out of the gate of the runner is perpendicular to the axis of the cavity. The arrangement can enable the molten material to be distributed more uniformly in the process of filling the cavity, so that defects such as pits and burrs caused by uneven flow of the molten material are reduced.

Preferably, the runner gate is located at a position of maximum diameter of the cavity, where the product thickness is the maximum, and the runner gate is located at a position that ensures that the melt has sufficient pressure and volume to fill the entire cavity, avoiding insufficient and uneven filling of the melt.

Preferably, the tail end of the inclined guide post is provided with a hemispherical part, the hemispherical part can better guide the inclined guide post to enter the inclined guide cavity when the die is assembled, so that the inclined guide post can smoothly enter the inclined guide cavity, and the hemispherical part can reduce friction between the tail end of the inclined guide post and the inner wall of the inclined guide cavity.

The mold has the advantages that the rear mold core assembly is divided into the fixed block and the sliding block, the sliding block can slide to be separated from a product when the mold is opened, so that the adhesion area of the product on the rear mold core assembly is reduced, the demolding resistance of the product is reduced, and then the ejector pin ejects the product by ejecting a water gap connected with the product, so that the contact between the ejector pin and the product is avoided, and the ejector pin mark is prevented from being left on the surface of the product.

Drawings

FIG. 1 is a cross-sectional view of an injection mold of a pipe fitting joint from a forward perspective;

FIG. 2 is an enlarged schematic view of portion A of FIG. 1;

Fig. 3 is a cross-sectional view from the side of an injection mold for pipe joints, with a partial cross-sectional line not shown and with arrows pointing in the parting direction of the mold.

FIG. 4 is an enlarged schematic view of portion B of FIG. 2, wherein arrows point in the flow direction of the melt;

FIG. 5 is a schematic view of the structure of a pipe fitting joint after the injection mold is opened and before the product is demolded;

FIG. 6 is an enlarged schematic view of portion C of FIG. 5;

FIG. 7 is a schematic illustration of the structure of a pipe fitting joint after demolding of the injection mold product;

fig. 8 is an enlarged schematic view of a portion D in fig. 7.

In the drawing, a front mold core assembly, a 101-insert clamping groove, a 2-first mold core, a 3-base plate assembly, a 301-base, a 302-B plate, a 303-guide plate, a 3031-positioning clamping groove, a 4-push plate assembly, a 5-ejector pin, a 6-second mold core, a 7-inclined guide post, a 701-hemispherical part, an 8-fixed block, a 801-mold cavity, an 802-runner, a 803-through hole, a 9-slide block, a 901-inclined guide cavity, a 902-second inclined plane, a 10-limiting block, a 1001-first inclined plane, a 1002-bulge, a 11-stainless steel insert and a 12-product are formed.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the patent, and certain components of the drawings may be omitted, enlarged or reduced in order to better illustrate the present embodiments, and do not represent the actual product size, and it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationship depicted in the drawings is for illustrative purposes only and is not to be construed as limiting the present patent.

In the description of the present utility model, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", "long", "short", etc., which are based on the azimuth or positional relationship shown in the drawings, it is merely for convenience of describing the present utility model and simplifying the description, and it is not indicated or implied that the apparatus or elements referred to must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and are not to be construed as limitations of the present patent, and that the specific meanings of the terms described above should be understood by those skilled in the art according to specific circumstances.

The technical scheme of the utility model is further specifically described by the following specific embodiments with reference to the accompanying drawings:

Example 1

The first embodiment of the injection mold for pipe fittings is shown in fig. 1 to 8, and comprises a front mold and a rear mold, wherein the front mold comprises a front mold core assembly 1 and a first mold core 2, a feed port (not shown in the figure) and an insert clamping groove 101 are formed in the front mold core assembly 1, the first mold core 2 is connected with the front mold core assembly 1, a part of the first mold core is positioned in the insert clamping groove 101, the rear mold comprises a bottom plate assembly 3, a push plate assembly 4, a thimble 5, a rear mold core assembly and a second mold core 6, the push plate assembly 4 is in sliding connection with the bottom plate assembly 3 along the vertical direction, the thimble 5 is connected with the push plate assembly 4 and in sliding connection with the bottom plate assembly 3 along the vertical direction, the second mold core 6 is connected with the bottom plate assembly 3, and a cavity 801 is formed between the front mold core assembly 1 and the rear mold core assembly in a mold clamping state. Further, the front mold core component 1 is connected with an inclined guide post 7, the rear mold core component comprises a fixed block 8 and a sliding block 9, the fixed block 8 is connected with the bottom plate component 3, the sliding block 9 is arranged on one side of the fixed block 8 and is connected with the bottom plate component 3 in a sliding mode along the horizontal direction, an inclined guide cavity 901 is formed in the sliding block 9, the top center of the inclined guide cavity 901 is closer to the fixed block 8 relative to the bottom center of the inclined guide cavity 901, a cavity 801 is formed among the front mold core component 1, the sliding block 9 and the fixed block 8 in a mold closing state, a runner 802 communicated with the cavity 801 is formed between the sliding block 9 and the fixed block 8, the runner 802 is communicated with a feed inlet, a part of the inclined guide post 7 protruding out of the front mold core component 1 stretches into the inclined guide cavity 901, a through hole 803 is formed in the fixed block 8, the through hole 803 is communicated with the runner 802, and the tail end of the ejector pin 5 can stretch into the runner 802 through the through hole 803.

Further, the axis of the gate of the runner 802 is perpendicular to the axis of the cavity 801, that is, the flow direction of the melt as it flows out of the gate of the runner 802 is perpendicular to the axis of the cavity 801. The arrangement can enable the molten material to be distributed more uniformly in the process of filling the cavity 801, so that defects such as pits and burrs caused by uneven flow of the molten material are reduced.

Further, the gate of the runner 802 is located where the cavity 801 is the largest diameter and near the bottom end of the stainless steel insert 11. This location is where the thickness of product 12 is greatest, and positioning the gate of runner 802 at this location ensures that there is sufficient pressure and volume of melt to fill the entire cavity 801, avoiding under-filling and non-uniform filling of melt. Because the stainless steel insert 11 will be inclined to a certain extent after being mounted in the insert clamping groove 101, after the gate is arranged at the position, the molten material can push the stainless steel insert 11 when entering the cavity 801 from the runner 802, so that the stainless steel insert 11 is forced to be adjusted to the correct position, and the shape and the dimensional accuracy of the product are improved.

Further, the end of the oblique guide post 7 is provided with a hemispherical part 701, the hemispherical part 701 can better guide the oblique guide post 7 into the oblique guide cavity 901 when the die is assembled, so that the oblique guide post 7 can smoothly enter the oblique guide cavity 901, and the hemispherical part 701 can reduce friction between the end of the oblique guide post 7 and the inner wall of the oblique guide cavity 901.

The working principle or the working flow of the embodiment is implemented by firstly clamping one end of a stainless steel insert 11 into an insert clamping groove 101, exposing the other end of the stainless steel insert 11 outside a front mold core assembly 1, then clamping the front mold and a rear mold, enabling one end of the stainless steel insert 11 exposed outside the front mold core assembly 1 to enter a cavity 801, enabling one end of a second mold core 6 positioned in the cavity 801 to extend into an inner cavity of the stainless steel insert 11, then injecting molten material into a feed port, enabling the molten material to enter the cavity 801 through a runner 802, enabling the front mold core assembly 1 to move upwards after the molten material in the cavity 801 is cooled and solidified, enabling the first mold core 2 and a diagonal guide post 7 to move upwards together, enabling the diagonal guide post 7 to apply a horizontal component force to the inner wall of the diagonal guide cavity 901, enabling a sliding block 9 to slide away from a fixed block 8 so as to separate from a product 12, enabling a part of the area of the product 12 to be exposed outside, enabling a push plate 4 to push a thimble 5 to slide upwards after the sliding block 9 is completely separated from the product 12, enabling the thimble 5 to penetrate through the port to jack up a water gap connected with the product 12, enabling the thimble to jack up 12 to be separated from the product 803, and completing the product lifting up to be fixed by the product 803. When the front mold core assembly 1 moves downwards in the next mold closing process, the inclined guide pillar 7 can extend into the inclined guide cavity 901, and the sliding block 9 gradually approaches the fixed block 8 along with the gradual downward movement of the inclined guide pillar 7 until the sliding block is attached to the fixed block 8.

According to the technical scheme, the part of the inner wall of the cavity 801 and the part of the inner wall of the runner 802 are arranged on the fixed block 8, the part of the inner wall is arranged on the sliding block 9, and the sliding block 9 can be separated from the product 12 during mold opening, so that only a small part of the product 12 is left to be adhered on the inner wall of the cavity 801, and the subsequent demolding resistance of the product 12 is reduced. Because the demolding resistance of the product 12 is smaller in the subsequent demolding, the ejector pin 5 can jack up the product 12 by jacking up the water gap, and because the ejector pin 5 is not in direct contact with the product 12, the surface of the product 12 is not provided with ejector pin marks, and the appearance quality of the product 12 can be improved.

The mold has the advantages that the rear mold core assembly is divided into the fixed block and the sliding block, the sliding block can slide to be separated from a product when the mold is opened, so that the adhesion area of the product on the rear mold core assembly is reduced, the demolding resistance of the product is reduced, then the ejector pin ejects the product through the water gap connected with the product, the contact between the ejector pin and the product is avoided, and the ejector pin mark is prevented from being left on the surface of the product.

Example 2

The second embodiment of the injection mold for pipe fittings is similar to embodiment 1, and is different in that, as shown in fig. 1 to 8, a stopper 10 is provided on the front mold core assembly 1, a first inclined surface 1001 is provided on the stopper 10, the axis of the inclined guide post 7 is parallel to the first inclined surface 1001, a second inclined surface 902 is provided on the slide block 9, in the mold closing state, the slide block 9 is located between the fixed block 8 and the stopper 10, and the second inclined surface 902 is attached to the first inclined surface 1001. When the die is opened, the limiting block 10 moves upwards along with the front die core assembly 1, the sliding block 9 also slides under the pushing of the inclined guide post 7, and the first inclined surface 1001 and the second inclined surface 902 keep fit until the limiting block 10 is separated from the sliding block 9. When the mold is closed, the first inclined surface 1001 and the second inclined surface 902 are kept in contact, and a horizontal component force is applied to the first inclined surface 1001 during the downward movement of the second inclined surface 902, and the horizontal component force pushes the slide 9 to the fixed block 8. The limiting block 10 plays a certain guiding role on the sliding of the sliding block 9, so that the sliding of the sliding block 9 is more stable, and damage to the product 12 caused by unstable sliding of the sliding block 9 when the sliding block is separated from the product 12 is avoided. And the limiting block 10 can improve the position accuracy of the sliding block 9 in the die closing state.

Further, a positioning slot 3031 is provided on the bottom plate assembly 3, a protrusion 1002 is provided on the stopper 10, and the protrusion 1002 is clamped with the positioning slot 3031 in the mold clamping state. The positioning clamping groove 3031 and the protrusion 1002 can enable the position of the sliding block 9 in the die assembly state to be more accurate, and the molding precision and quality of the product 12 can be improved.

Specifically, the bottom plate assembly 3 comprises a base 301, a B plate 302 and a guide plate 303, the push plate assembly 4 is slidably connected with the base 301 along the vertical direction, the B plate 302 is positioned between the guide plate 303 and the base 301 and is connected with the base 301, the second core 6 is fixedly connected with the B plate 302 and is slidably connected with the guide plate 303 along the vertical direction, and the sliding block 9 is slidably connected with the guide plate 303 along the horizontal direction. When the front mold core assembly 1 is opened, after the front mold core assembly 1 moves upwards to be separated from the fixed block 8 and the sliding block 9, the guide plate 303 keeps motionless, the base 301 and the B plate 302 move downwards, so that the second mold core 6 is driven to move downwards for a certain distance, the second mold core 6 is separated from the product 12, and then the ejector pins 5 are lifted upwards. It will be appreciated that the first parting plane of the die is between the front die core assembly 1 and the fixed block 8 and the second parting plane is between the guide plate 303 and the B plate 302. The provision of the second parting plane allows the second core 6 to be withdrawn from the product 12 first, which further reduces the subsequent release resistance of the product 12.

Other features, operation principles, and advantageous effects of this embodiment are the same as those of embodiment 1.

Example 3

The third embodiment of the injection mold for pipe joints is similar to embodiment 2, but in the mold clamping state, as shown in fig. 1 to 8, four cavities 801 are formed among the front mold insert assembly 1, the fixed block 8 and one slide block 9, 2 flow passages are formed between the fixed block 8 and one slide block 9, each two cavities 801 are communicated with one flow passage 802, the front mold insert assembly 1 is provided with an insert clamping groove 101 and a first mold core 2 which are in one-to-one correspondence with the cavities 801, that is, one cavity 801 is corresponding to one insert clamping groove 101 and one first mold core 2, and the bottom plate assembly 3 is provided with a second mold core 6 which is in one-to-one correspondence with the first mold core 2, that is, one second mold core 6 is corresponding to one first mold core 2.

Further, the slide block 9 is provided with two slide blocks which are respectively positioned at two opposite sides of the fixed block 8, and the inclined guide post 7, the thimble 5, the first core 2 and the second core 6 are respectively arranged, namely, the inclined guide post 7, the thimble 5, the first core 2 and the second core 6 are correspondingly increased according to the increase of the slide block 9. In the mold opening process, the two slide blocks 9 slide to the two sides far away from the fixed block 8 respectively, and in the mold closing process, the two slide blocks 9 slide to the directions close to the fixed block 8 respectively. The provision of two slides 9 allows more products 12 to be obtained after one injection moulding, thereby further improving the production efficiency.

Further, four inclined guide posts 7 are arranged on the front mold core assembly 1, two inclined guide cavities 901 corresponding to the inclined guide posts 7 one by one are arranged on each sliding block 9, namely, one sliding block 9 is correspondingly matched with the two inclined guide posts 7, and one inclined guide post 7 is correspondingly matched with one inclined guide cavity 901. The two inclined guide posts 7 are matched with one sliding block 9, so that the burden of a single inclined guide post 7 can be reduced, the service life of the inclined guide posts 7 can be prolonged, and the sliding stability of the sliding block 9 can be improved.

Other features, operation principles, and advantageous effects of this embodiment are the same as those of embodiment 2.

In the specific content of the above embodiment, any combination of the technical features may be performed without contradiction, and for brevity of description, all possible combinations of the technical features are not described, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

It is to be understood that the above examples of the present utility model are provided by way of illustration only and not by way of limitation of the embodiments of the present utility model. Other variations or modifications of the various aspects will be apparent to persons skilled in the art from the foregoing description, and it is not necessary nor intended to be exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. An injection mold for pipe fittings comprises a front mold and a rear mold, wherein the front mold comprises a front mold core assembly (1) and a first core (2), a feed inlet and an insert clamping groove (101) are formed in the front mold core assembly (1), the first core (2) is connected with the front mold core assembly (1) and is at least partially positioned in the insert clamping groove (101), the rear mold comprises a bottom plate assembly (3), a push plate assembly (4), a thimble (5), a rear mold core assembly and a second core (6), the push plate assembly (4) is connected with the bottom plate assembly (3) in a sliding mode along the vertical direction, the thimble (5) is connected with the push plate assembly (4) and is connected with the bottom plate assembly (3) in a sliding mode along the vertical direction, the second core (6) is connected with the bottom plate assembly (3), a cavity (801) is formed between the front mold core assembly (1) and the rear mold core assembly in a mold clamping state, the front mold core assembly (1) is connected with a horizontal block (7) and a sliding block (8) is fixedly connected with the horizontal block (8) along one side of the horizontal block (8), the die comprises a front die core assembly (1), a front die core, a front ejector pin (5) and a front ejector pin, wherein an inclined guide cavity (901) is formed in the sliding block (9), the top center of the inclined guide cavity (901) is closer to the fixed block (8) than the bottom center of the inclined guide cavity, a cavity (801) is formed between the sliding block (9) and the fixed block (8), a runner (802) communicated with the cavity (801) is formed between the sliding block (9) and the fixed block (8), the runner (802) is communicated with the feeding hole, the part of the inclined guide pin (7) protruding out of the front die core assembly (1) stretches into the inclined guide cavity (901), and the tail end of the ejector pin (5) can stretch into the runner (802).

2. The injection mold for pipe fittings according to claim 1, wherein a limiting block (10) is arranged on the front mold core assembly (1), a first inclined surface (1001) is arranged on the limiting block (10), the axis of the inclined guide post (7) is parallel to the first inclined surface (1001), a second inclined surface (902) is arranged on the sliding block (9), in a mold closing state, the sliding block (9) is located between the fixed block (8) and the limiting block (10), and the second inclined surface (902) is attached to the first inclined surface (1001).

3. An injection mould for pipe fittings according to claim 2, characterized in that the base plate assembly (3) is provided with a positioning clamping groove (3031), the limiting block (10) is provided with a protrusion (1002), and the protrusion (1002) is clamped with the positioning clamping groove (3031) in a mould clamping state.

4. An injection mould for pipe joints according to claim 1, characterized in that the bottom plate assembly (3) comprises a base (301), a B plate (302) and a guide plate (303), the push plate assembly (4) is slidably connected with the base (301) along a vertical direction, the B plate (302) is located between the guide plate (303) and the base (301) and is connected with the base (301), the second core (6) is fixedly connected with the B plate (302) and is slidably connected with the guide plate (303) along a vertical direction, and the slide block (9) is slidably connected with the guide plate (303) along a horizontal direction.

5. The injection mold for pipe fittings according to claim 1, wherein in a mold clamping state, at least two cavities (801) are formed between the front mold core assembly (1), the fixing block (8) and the sliding block (9), the runner (802) is communicated with the at least two cavities (801), at least two insert clamping grooves (101) and first cores (2) which are in one-to-one correspondence with the cavities (801) are formed in the front mold core assembly (1), and at least two second cores (6) which are in one-to-one correspondence with the first cores (2) are formed in the bottom plate assembly (3).

6. The injection mold for pipe fitting joints according to claim 5, wherein the front mold core assembly (1) is provided with at least two inclined guide posts (7), and the sliding block (9) is provided with at least two inclined guide cavities (901) corresponding to the inclined guide posts (7) one by one.

7. The injection mold for pipe fittings according to claim 1, wherein the sliding blocks (9) are provided with two sliding blocks which are respectively positioned on two opposite sides of the fixed block (8), and the inclined guide posts (7), the ejector pins (5), the first core (2) and the second core (6) are respectively arranged.

8. An injection mould for pipe joints according to claim 1, characterized in that the gate of the runner (802) has an axis perpendicular to the axis of the cavity (801).

9. An injection mould for pipe joints according to claim 8, characterised in that the gate of the runner (802) is located where the diameter of the cavity (801) is greatest.

10. An injection mould for pipe joints according to any one of claims 1 to 9, characterised in that the end of the diagonal guide post (7) is provided with a hemispherical portion (701).