Injection mold for elbow products with automatic demoulding

Abstract

The present invention discloses an injection mold for automatic demoulding of an elbow product, comprising a female mold fixing plate, a female mold plate, a push plate, a male mold plate, a bottom plate and two sets of elbow release mechanisms, wherein the elbow release mechanism comprises a core assembly, a core plate assembly, two guide pillars, a pull rod, a connecting plate, an oil cylinder and an oil cylinder seat; the core assembly comprises a core body and a core guide head; the rear end of the core body is fixedly connected to the core plate assembly, one end of the two guide pillars passes through the core plate assembly and is fixedly connected to the push plate, the other end of the two guide pillars is fixedly connected to the oil cylinder seat, the telescopic shaft of the oil cylinder passes through the oil cylinder seat and is fixedly connected to the core plate assembly, one end of the pull rod passes through the core plate assembly and the core body and is rotatably connected to the core guide head through a pin, the other end of the pull rod is fixedly connected to the connecting plate, and the connecting plate is slidably sleeved on a guide pillar. The present invention realizes smooth demoulding of the elbow product in two directions, and has the advantages of simple structure and easy implementation.

Description

Technical Field

[0001] The invention relates to an injection mold, in particular to an injection mold for automatically demoulding an elbow product. Background Art

[0002] An injection mold is a tool for producing plastic products. It consists of a movable mold and a fixed mold. During injection molding, the movable mold and the fixed mold are closed to form a pouring system and a cavity. When the mold is opened, the movable mold and the fixed mold are separated to remove the plastic product. However, see Figure 1 Some plastic products 100 (such as elbow products) have two arc buckles 101, the axes of the two arc buckles are perpendicular to each other, and the opening diameter of the elbow product is relatively large. After the injection molding of these products is completed, it is often necessary to perform arc core pulling in two directions while opening the mold. However, the existing arc core pulling structure cannot meet this demand and the structure is relatively complex. Therefore, it is necessary to design and develop an injection mold for such plastic products. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention proposes an injection mold for automatic demoulding of elbow products, which realizes smooth demoulding of elbow products in two directions and has the advantages of simple structure and easy implementation.

[0004] The technical solution of the present invention is achieved as follows:

[0005] The cam is fixedly mounted on the bottom plate of the mold base and the bottom plate is fixedly mounted on the mold base, wherein the cam is fixedly mounted on the bottom plate of the mold base, wherein the cam is fixedly mounted on the bottom plate of the mold base, wherein the cam is fixedly mounted on the bottom plate of the mold base, The front end of the mold core of the core assembly of the buckle mechanism is docked to form a tube core for forming elbow products, and corresponding trapezoidal protrusions and trapezoidal grooves are formed on the surfaces of the front ends of the two core guide heads of the two sets of elbow release mechanisms; the rear end of the core body is fixedly connected to the core plate assembly, and the core plate assembly is arranged on the side of the push plate and the mother template, one end of the two guide columns passes through the first through hole on the core plate assembly and is fixedly connected to the push plate, and the other end of the two guide columns is fixedly connected to the cylinder seat, and the cylinder is installed on the outer side of the cylinder seat, and the telescopic shaft of the cylinder passes through the cylinder seat and is fixedly connected to the core plate assembly, one end of the pull rod passes through the core plate assembly and the second through hole on the core body in turn and is rotatably connected to the core guide head through a pin shaft, and the other end of the pull rod is fixedly connected to the connecting plate, and the connecting plate is slidably sleeved on one of the guide columns.

[0006] Furthermore, each set of elbow release mechanisms also includes a guide rod, one end of which is fixedly connected to the cylinder seat, and the other end of which is inserted into the third through hole on the connecting plate.

[0007] Furthermore, the side surface of the core guide head and the side wall of the notch groove are slidably connected through two sets of guide strips and guide grooves that cooperate with each other.

[0008] Furthermore, the core plate assembly includes a first core plate, a second core plate and a third core plate, a circular plate hole is formed in the center of the first core plate, a circular disc is formed at the rear end of the core body, the circular disc is inserted into the circular plate hole from the inner side of the first core plate, the second core plate is fixed to the outer side of the first core plate by a number of fasteners, and the second core plate is fixedly connected to the circular disc by a number of fasteners; the third core plate is fixed to the middle part of the outer side of the second core plate by a number of fasteners, and the telescopic shaft of the oil cylinder is fixedly connected to the third core plate.

[0009] Furthermore, a guide slot is formed on the pull rod along the axial direction, and a guide block is embedded on the second core plate. The guide block has a guide protrusion that is slidably engaged with the guide slot.

[0010] Furthermore, a front mold insert for forming material identification characters is embedded on the inner wall of the mold cavity of the mother template, and the front mold insert is locked to the mother template by fasteners.

[0011] Furthermore, a plurality of spring grooves are formed on the surface of the mother template facing the push plate, and air springs for pushing the push plate open are installed in the spring grooves.

[0012] Furthermore, the injection mold also includes a gate structure, which includes a gate sleeve and a positioning ring. A gate runner is formed on the male mold core. The top of the gate sleeve is fixed to the top of the female mold fixing plate through the positioning ring. The bottom end of the gate sleeve passes through the through hole on the female mold plate and extends into the gate runner. The gate runner and the clamp structure are located on the inner side of the bend of the elbow product.

[0013] Furthermore, the injection mold also includes a gate ejection structure, which includes an ejector pin and an ejector plate. The ejector plate is arranged on the top of the base plate and located between the two pads. The bottom end of the ejector pin is fixed to the ejector plate, and the top end of the ejector pin passes through the ejector holes on the male mold plate and the male mold core and then extends into the gate runner.

[0014] The beneficial effects of the present invention are as follows: the present invention provides an injection mold for automatic demoulding of an elbow product, and two sets of elbow release mechanisms are set corresponding to the two pipe openings of the elbow product, thereby realizing smooth demoulding of the elbow product in two vertical directions, and having the advantages of simple structure and easy implementation. The technical principle of the elbow release mechanism is as follows: first, the cylinder drives the core plate assembly to retreat. Since the core body of the core assembly is fixed to the core plate assembly, when the core plate assembly retreats, the core body will be driven to retreat. Since the connecting plate is arranged in the middle of the guide column, the core guide head remains stationary; when the core body is out of the set distance, the core plate assembly slides along the guide column to the connecting plate. At this time, the core plate assembly will drive the connecting plate and the pull rod to retreat, and the pull rod will drive the core guide head to be demolded. Since corresponding trapezoidal protrusions and trapezoidal grooves are formed on the surfaces where the front ends of the two core guide heads are connected to each other, and the core guide head and the pull rod are rotatably connected by a pin shaft, under the interaction of the trapezoidal protrusion and the trapezoidal groove, the core guide head will rotate inward, thereby avoiding the arc part of the elbow product and realizing circular arc core pulling in two directions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1This is a structural diagram of an elbow product according to an embodiment of the present invention;

[0016] Figure 2 A three-dimensional diagram of an injection mold for automatically demoulding an elbow product of the present invention;

[0017] Figure 3 A side view of the injection mold for the automatic demoulding of the elbow product of the present invention;

[0018] Figure 4 for Figure 3 Sectional view in the AA direction;

[0019] Figure 5 A top view of the injection mold for the automatic demoulding of the elbow product of the present invention;

[0020] Figure 6 for Figure 5 Cross-sectional view in the middle BB direction;

[0021] Figure 7 for Figure 5 Cross-sectional view in the CC direction;

[0022] Figure 8 An exploded view of the injection mold for the automatic demoulding of the elbow product of the present invention;

[0023] Figure 9 It is a structural schematic diagram of a core assembly in the present invention;

[0024] Figure 10 It is a structural schematic diagram of another core assembly in the present invention;

[0025] Figure 11 This is an assembly diagram of the mother template and the air spring in the present invention;

[0026] In conjunction with the accompanying drawings, the following description is given:

[0027] 1- female mold fixing plate, 2- female mold plate, 21- front mold insert, 22- spring groove, 23- air spring, 3- push plate, 4- male mold plate, 5- bottom plate, 6- pad, 7- male mold core, 10- elbow release mechanism, 110- core assembly, 111- core body, 1111- notch groove, 1112- disc, 112- core guide head, 113- mold core, 114- trapezoidal protrusion, 115- trapezoidal groove, 116- guide bar, 117- guide groove, 120- core plate assembly, 121-first core plate, 1211-circular plate hole, 122-second core plate, 123-third core plate, 124-guide block, 130-guide column, 140-pull rod, 141-guide chute, 150-connecting plate, 160-oil cylinder, 170-oil cylinder seat, 180-guide rod, 20-gate structure, 210-gate sleeve, 220-positioning ring, 30-gate ejection structure, 310-ejector, 320-ejector plate, 100-elbow product, 101-arc buckle position. DETAILED DESCRIPTION

[0028] In order to make the present invention more clear and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0029] like Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 and Figure 11As shown, an injection mold for automatic demoulding of elbow products includes a female mold fixing plate 1, a female mold plate 2, a push plate 3, a male mold plate 4 and a bottom plate 5 arranged in sequence. The male mold plate is installed on the bottom plate through two pads 6, so that an assembly space is formed between the male mold plate and the bottom plate. A male mold core 7 is provided in the square hole in the middle of the push plate. The bottom end of the male mold core is fixedly connected to the male mold plate. The male mold core and the female mold plate form an injection cavity. The injection mold also includes a female mold fixing plate 1, a female mold plate 2, a push plate 3, a male mold plate 4 and a bottom plate 5 arranged in sequence. The male mold plate is installed on the bottom plate through two pads 6, so that an assembly space is formed between the male mold plate and the bottom plate. The male mold core 7 is provided in the square hole in the middle of the push plate. The bottom end of the male mold core is fixedly connected to the male mold plate. The male mold core and the female mold plate form an injection cavity. The injection mold also includes a female mold fixing plate 1, a female mold plate 2, a push plate 3, a male mold plate 4 and a bottom plate 5. Two corresponding sets of elbow release mechanisms 10, each set of elbow release mechanisms includes a core assembly 110, a core plate assembly 120, two guide pillars 130, a pull rod 140, a connecting plate 150, a cylinder 160 and a cylinder seat 170; the core assembly includes a core body 111 and a core guide head 112, the front end of the core body has a notch groove 1111, the core guide head is arranged in the notch groove, the core guide head and the core body together form a core body for forming an elbow. The mold core 113 of a pipe mouth of a head product, the front ends of the mold cores of the core assemblies of the two sets of elbow release mechanisms are butted together to form a tube core for forming elbow products, and corresponding trapezoidal protrusions 114 and trapezoidal grooves 115 are formed on the surfaces where the front ends of the two core guide heads of the two sets of elbow release mechanisms are butted together; the rear end of the core body is fixedly connected to the core plate assembly, and the core plate assembly is arranged on the side of the push plate and the mother template, one end of the two guide posts is fixedly connected to the push plate after passing through the first through hole on the core plate assembly, and the other end of the two guide posts is fixedly connected to the cylinder seat, and the cylinder is installed on the outside of the cylinder seat, and the telescopic shaft of the cylinder is fixedly connected to the core plate assembly after passing through the cylinder seat, and one end of the pull rod is rotated with the core guide head through a pin after passing through the second through hole on the core plate assembly and the core body, and the other end of the pull rod is fixedly connected to the connecting plate, and the connecting plate is slidably sleeved on one of the guide posts.

[0030] In the above structure, two sets of elbow release mechanisms are provided corresponding to the two pipe openings of the elbow product, thereby realizing smooth demoulding of the elbow product in two vertical directions, and having the advantages of simple structure and easy implementation. The technical principle of the elbow release mechanism is as follows: first, the cylinder drives the core plate assembly to retreat. Since the core body of the core assembly is fixed to the core plate assembly, when the core plate assembly retreats, the core body will be driven to retreat. Since the connecting plate is arranged in the middle of the guide column, the core guide head remains stationary; when the core body is out of the set distance, the core plate assembly slides along the guide column to the connecting plate. At this time, the core plate assembly will drive the pull rod to retreat, and the pull rod will drive the core guide head to be demolded. Since corresponding trapezoidal protrusions and trapezoidal grooves are formed on the surfaces where the front ends of the two core guide heads are connected to each other, and the core guide head and the pull rod are rotatably connected by a pin shaft, under the interaction of the trapezoidal protrusion and the trapezoidal groove, the core guide head will rotate inward, thereby avoiding the arc part of the elbow product and realizing circular arc core pulling in two directions.

[0031] Preferably, see Figure 1 Each elbow release mechanism further includes a guide rod 180, one end of which is fixedly connected to the cylinder seat, and the other end of which is inserted into the third through hole on the connecting plate. In this way, the connecting plate can run more smoothly under the guidance of the guide rod.

[0032] Preferably, see Figure 8 、 Figure 9 and Figure 10 The side of the core guide head and the sidewall of the notch are slidably connected by two sets of cooperating guide strips 116 and guide grooves 117. This sliding engagement between the guide strips and guide grooves prevents the core body from shaking during demolding. Furthermore, the cooperation between the guide strips and guide grooves ensures accurate mold closing.

[0033] Preferably, see Figure 1 and Figure 3 The core plate assembly includes a first core plate 121, a second core plate 122, and a third core plate 123. A circular plate hole 1211 is formed in the center of the first core plate. A disc 1112 is formed at the rear end of the core body. The disc is inserted into the circular plate hole from the inner side of the first core plate. The second core plate is fixedly connected to the outer side of the first core plate by a number of fasteners, and the second core plate is fixedly connected to the disc by a number of fasteners. The third core plate is fixedly connected to the middle part of the outer side of the second core plate by a number of fasteners, and the telescopic shaft of the oil cylinder is fixedly connected to the third core plate. In this way, the function of fixedly connecting the core body can be achieved through the cooperation of the first core plate and the second core plate. The function of fixedly connecting the telescopic shaft of the oil cylinder can be achieved through the cooperation of the second core plate and the third core plate.

[0034] Preferably, see Figure 1 The tie rod is formed with a guide groove 141 along the axial direction, and the second core plate is embedded with a guide block 124, which has a guide protrusion that slides with the guide groove. In this way, the sliding engagement between the guide protrusion of the guide block and the guide groove of the tie rod can play a role in sliding guidance.

[0035] Preferably, see Figure 6 The inner wall of the cavity of the mother template is embedded with a front mold insert 21 for forming the material identification word, and the front mold insert is locked to the mother template by fasteners. In this way, the material identification word can be formed during the injection molding process of the elbow product.

[0036] Preferably, see Figure 11 The surface of the mother plate facing the push plate is formed with a plurality of spring grooves 22, in which air springs 23 are installed for ejecting the push plate. In this way, the air springs arranged on the mother plate can eject the push plate after the mold is opened and prevent mold collision during mold closing.

[0037] Preferably, see Figure 6 The injection mold also includes a gate structure 20, which includes a gate sleeve 210 and a positioning ring 220. A gate runner is formed on the male mold core. The top of the gate sleeve is fixed to the top of the female mold fixing plate via the positioning ring. The bottom of the gate sleeve passes through a through hole in the female mold plate and extends into the gate runner. The gate runner and the clamping structure are located inside the bend of the elbow product. In this way, the gate structure can realize the injection function. The gate is located at the bend of the elbow product, which facilitates injection of glue.

[0038] Preferably, see Figure 6 The injection mold also includes a gate ejection structure 30, which includes an ejector pin 310 and an ejector plate 320. The ejector plate is mounted on top of the base plate and positioned between the two spacers. The bottom end of the ejector pin is fixed to the ejector plate, and the top end of the ejector pin passes through the ejector holes in the male mold plate and the male mold core and extends into the gate runner. In this way, the gate ejection structure can eject the gate after injection. Furthermore, the gate is connected to an elbow product, allowing the elbow product to be ejected during the gate ejection process.

[0039] The above embodiments are a detailed description of preferred embodiments of the present invention with reference to the accompanying drawings. Those skilled in the art may make various modifications or changes to the above embodiments without departing from the essence of the present invention, which shall fall within the scope of protection of the present invention.

Claims

1. An injection mold for automatic demoulding of elbow products, comprising a mother mold fixing plate (1), a mother mold plate (2), a push plate (3), a male mold plate (4) and a bottom plate (5) arranged in sequence, wherein the male mold plate is mounted on the bottom plate via two spacers (6) so that an assembly space is formed between the male mold plate and the bottom plate, a male mold core (7) is provided in a square hole in the middle of the push plate, the bottom end of the male mold core is fixedly connected to the male mold plate, and the male mold core and the mother mold plate form an injection molding cavity, characterized in that: The injection mold further comprises two sets of elbow release mechanisms (10) corresponding to the two pipe openings of the elbow product, each set of elbow release mechanisms comprising a core assembly (110), a core plate assembly (120), two guide posts (130), a pull rod (140), a connecting plate (150), a cylinder (160) and a cylinder seat (170); the core assembly comprises a core body (111) and a core guide head (112), the front end of the core body having a notch groove (1111), the core guide head being arranged in the notch groove, the core guide head and the core body together forming a mold core (113) for forming a pipe opening of the elbow product, the two sets of elbow release mechanisms The front ends of the cores of the core assembly of the latch mechanism are butted together to form a tube core for forming an elbow product, and corresponding trapezoidal protrusions (114) and trapezoidal grooves (115) are formed on the butted surfaces of the front ends of the two core guide heads of the two sets of elbow release mechanisms; the rear end of the core body is fixedly connected to the core plate assembly, the core plate assembly is arranged on the side of the push plate and the mother template, one end of the two guide posts passes through the first through hole on the core plate assembly and is fixedly connected to the push plate, the other end of the two guide posts is fixedly connected to the cylinder seat, the cylinder is installed on the outside of the cylinder seat, and the telescopic shaft of the cylinder passes through the cylinder seat and is fixedly connected to the core plate assembly; One end of the pull rod passes through the core plate assembly and the second through hole on the core body in sequence and is rotatably connected to the core guide head via a pin shaft. Under the interaction of the trapezoidal protrusion (114) and the trapezoidal groove (115), the core guide head (112) will rotate inward to avoid the arc portion of the elbow product, thereby realizing arc core pulling in two directions. The other end of the pull rod is fixedly connected to the connecting plate, and the connecting plate is slidably mounted on one of the guide columns; each set of elbow release mechanisms also includes a guide rod (180), one end of which is fixedly connected to the cylinder seat, and the other end of the guide rod is passed through the third through hole on the connecting plate; the side surface of the core guide head and the side wall of the notch groove are slidably connected through two sets of guide strips (116) and guide grooves (117) that cooperate with each other.

2. The automatic demoulding injection mold for elbow products according to claim 1, characterized in that: The core plate assembly comprises a first core plate (121), a second core plate (122) and a third core plate (123); a circular plate hole (1211) is formed in the center of the first core plate; a disc (1112) is formed at the rear end of the core body; the disc is inserted into the circular plate hole from the inner side of the first core plate; the second core plate is fixed to the outer side of the first core plate by a plurality of fasteners, and the second core plate is fixedly connected to the disc by a plurality of fasteners; the third core plate is fixed to the middle part of the outer side of the second core plate by a plurality of fasteners, and the telescopic shaft of the oil cylinder is fixedly connected to the third core plate.

3. The automatic demoulding injection mold for elbow products according to claim 2, characterized in that: A guide slot (141) is formed on the pull rod along the axial direction, and a guide block (124) is embedded on the second core plate. The guide block has a guide protrusion that is slidably matched with the guide slot.

4. The automatic demoulding injection mold for elbow products according to claim 1, characterized in that: A front mold insert (21) for forming material identification characters is embedded on the inner wall of the mold cavity of the mother mold plate, and the front mold insert is locked to the mother mold plate through a fastener.

5. The automatic demoulding injection mold for elbow products according to claim 1, characterized in that: A plurality of spring grooves (22) are formed on the surface of the mother template facing the push plate, and air springs (23) for ejecting the push plate are installed in the spring grooves.

6. The automatic demoulding injection mold for elbow products according to claim 1, characterized in that: The injection mold also includes a gate structure (20), which includes a gate sleeve (210) and a positioning ring (220). A gate runner is formed on the male mold core, and the top of the gate sleeve is fixed to the top of the female mold fixing plate through the positioning ring. The bottom end of the gate sleeve passes through the through hole on the female mold plate and extends into the gate runner. The gate runner and the gate structure are located on the inner side of the bend of the elbow product.

7. The automatic demoulding injection mold for elbow products according to claim 6, characterized in that: The injection mold further includes a gate ejection structure (30), which includes an ejector pin (310) and an ejector plate (320). The ejector plate is arranged on the top of the base plate and located between the two pads. The bottom end of the ejector pin is fixed to the ejector plate, and the top end of the ejector pin passes through the ejector holes on the male mold plate and the male mold core and then extends into the gate runner.

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