Rotary demoulding structure of injection mold and injection mold

Abstract

The present invention provides a rotary demolding structure of an injection mold and an injection mold. The rotary demolding structure includes a push rod, a linkage rod, an ejector head and a first elastic member. The push rod can move in its own extension direction. The linkage rod extends in the extension direction of the push rod, and the linkage rod and the push rod are arranged side by side. The first elastic member forces the first end of the linkage rod to be close to the first end of the push rod in the extension direction of the linkage rod. The first end of the push rod is provided with a first hinge shaft hinged to the ejector head. The first end of the linkage rod is provided with a second hinge shaft hinged to the ejector head. The ejector head is provided with a first waist-shaped groove, and the first hinge shaft is inserted into the first waist-shaped groove; and / or, the ejector head is provided with a second waist-shaped groove, and the second hinge shaft is inserted into the second waist-shaped groove. The rotary demolding structure of the present invention can realize rotary demolding of injection molded products, improve the yield rate and production efficiency, and has a simple and compact structure, is convenient for installation and disassembly, shortens the mold production cycle, and further improves production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding production, in particular to a rotary demoulding structure of an injection mold and an injection mold with the rotary demoulding structure. Background Art

[0002] like Figures 1 to 3 The fuel tank cap 1 shown in the figure comprises an opening cover 11, a main cover body 12 and a ring cover 13 connected in sequence. The circumference of the opening cover 11 is bent and extended axially relative to its opening end 111, so that the inner cavity circumferential wall of the opening cover 11 has an inner buckle groove 112, and the outer circumferential wall of the opening end 111 of the opening cover 11 is provided with an inner concave ring groove 113. At the same time, the main cover body 12 has a hook end 121, and one end of the main cover body 12 away from the opening cover 11 is provided with four mounting holes 122. Moreover, the ring cover 13 is arranged in a closed ring at one end of the main cover body 12 away from the opening cover 11, and four avoidance holes 132 are fitted with the four mounting holes 122 in a one-to-one correspondence. The ring cover 13 is connected to the hook end 121 through a hooking structure, and an inner buckle hook 131 is formed with the hook end 121, and an inner groove 14 is formed between the outer wall of the hook end 121 and the outer wall of the ring cover 13.

[0003] The injection molding production process of this type of fuel tank cap 1 is that the main cover body 12 is firstly subjected to the first injection molding, and then the opening cover 11 and the ring cover 13 are subjected to the second injection molding on the main cover body 12 that has been subjected to the first injection molding. However, when the existing injection mold is subjected to the second injection molding of the opening cover 11 and the ring cover 13, due to the existence of the bent hook end 121 and the inner groove 14 formed between the outer wall of the bent hook end 121 and the outer wall of the ring cover 13, it is difficult to demould the product after the second molding, and the demoulding process is easy to cause damage to the product, which greatly reduces the yield rate.

[0004] In addition, when the existing injection mold is performing secondary injection molding of the opening cover 11 and the ring cover 13, the four avoidance holes 132 of the ring cover 13 are prone to deformation and warping, resulting in the ring cover 13 being unable to be tightly connected to the end of the main cover body 12 away from the opening cover 11, greatly reducing the production yield. Summary of the invention

[0005] The first object of the present invention is to provide a rotary demoulding structure of an injection mold with a simple structure, high yield and high production efficiency.

[0006] The second object of the present invention is to provide an injection mold having the above-mentioned rotation demolding structure.

[0007] In order to achieve the first purpose of the present invention, the present invention provides a rotary demolding structure of an injection mold, comprising a push rod, a linkage rod, an ejector head and a first elastic member, the push rod can move in its own extension direction, the linkage rod extends in the extension direction of the push rod, and the linkage rod and the push rod are arranged side by side, the first elastic member forces the first end of the linkage rod to be close to the first end of the push rod in the extension direction of the linkage rod, the first end of the push rod is provided with a first hinge shaft hinged to the ejector head, the first end of the linkage rod is provided with a second hinge shaft hinged to the ejector head, the ejector head is provided with a first waist-shaped groove, the first hinge shaft is inserted into the first waist-shaped groove; and / or, the ejector head is provided with a second waist-shaped groove, the second hinge shaft is inserted into the second waist-shaped groove.

[0008] It can be seen from the above scheme that when the rotary demolding structure is performing the product demolding action, it controls the ejector pin to move in its own extension direction, and the first hinge shaft of the ejector pin synchronously drives the ejector head to move away from the first end of the linkage rod in the extension direction of the ejector pin. Since the linkage rod can be elastically moved in the extension direction of the ejector pin, as one end of the ejector head moves in the extension direction of the ejector pin, the second end of the ejector head is forced to move the linkage rod in the opposite direction of the movement direction of the ejector pin through the second hinge shaft, thereby realizing the rotation of the ejector head around the extension direction perpendicular to the ejector pin. Since the end of the ejector head away from the ejector pin is located in the inner groove of the secondary molded fuel tank cap product, as the ejector head rotates around the extension direction perpendicular to the ejector pin, the ejector head synchronously drives the secondary molded fuel tank cap product to be rotated and demolded, and then the product can be removed from the ejector head by a robot. When the rotary demolding structure performs the mold closing action, the ejector rod is controlled to move close to the first end of the linkage rod in its own extension direction for reset, and the first hinge shaft of the ejector rod synchronously drives the ejector head to move close to the first end of the linkage rod in the extension direction of the ejector rod for reset, thereby eliminating the force on the second end of the ejector head, and the first elastic member can force the first end of the linkage rod to reset close to the first end of the ejector rod in the extension direction of the linkage rod. The rotary demolding structure of the present invention can realize rotary demolding of injection molded products, greatly improve the yield rate of injection molded products, and improve injection molding production efficiency. Moreover, the rotary demolding structure of the present invention has a simple and compact structure, is easy to install and disassemble, shortens the production cycle of the mold, and further improves production efficiency.

[0009] A further solution is that a first limit groove is provided on the side of the top rod near the linkage rod, the first limit groove extends in the extension direction of the top rod, and a first limit block is protruding from the side of the linkage rod near the top rod, and the first limit block is slidably located in the first limit groove; or, a second limit groove is provided on the side of the linkage rod near the top rod, the second limit groove extends in the extension direction of the top rod, and a second limit block is protruding from the side of the linkage rod near the linkage rod, and the second limit block is slidably located in the second limit groove.

[0010] A further solution is that the ejector head is provided with a first waist-shaped groove, the first hinge shaft is inserted into the first waist-shaped groove, and the ejector head is provided with a second waist-shaped groove, the second hinge shaft is inserted into the second waist-shaped groove, the second waist-shaped groove and the first waist-shaped groove are arranged side by side, and the second waist-shaped groove and the first waist-shaped groove extend in the side-by-side direction of the second waist-shaped groove and the first waist-shaped groove.

[0011] A further solution is that in the parallel direction of the second waist-shaped groove and the first waist-shaped groove, the length of the first waist-shaped groove is greater than the length of the second waist-shaped groove.

[0012] A further solution is that a groove is provided in the ejection head, and the first waist-shaped groove and the second waist-shaped groove respectively penetrate the first side wall and the second side wall opposite to the groove, the first hinge shaft penetrates the first end of the ejector rod, and the second hinge shaft penetrates the first end of the linkage rod, the first end of the ejector rod is located in the groove, and the two ends of the first hinge shaft are respectively inserted into the first waist-shaped grooves of the first side wall and the second side wall, the first end of the linkage rod is located in the groove, and the two ends of the second hinge shaft are respectively inserted into the second waist-shaped grooves of the first side wall and the second side wall.

[0013] A further solution is that the rotary demolding structure of the injection mold also includes a first guide plate, the first guide plate is provided with a first guide groove, the first guide groove extends in the extension direction of the push rod, and the first end of the first hinge shaft is slidably located in the first guide groove; and / or, the rotary demolding structure of the injection mold also includes a second guide plate, the second guide plate is provided with a second guide groove, the second guide groove extends in the extension direction of the push rod, and the second end of the first hinge shaft is slidably located in the second guide groove.

[0014] A further solution is that the rotary demoulding structure of the injection mold further includes a fixing seat, the first elastic member is a first return spring, and two ends of the first return spring are respectively abutted between the fixing seat and the second end of the linkage rod.

[0015] In order to achieve the second objective of the present invention, the present invention provides an injection mold, comprising a rotary demolding structure, and the rotary demolding structure is the rotary demolding structure of the injection mold mentioned above.

[0016] A further solution is that the injection mold includes a rear mold core, abutment parts and a second elastic part, the first assembly surface of the ejection head of the rotary demolding structure can be in contact with and cooperate with the second assembly surface of the rear mold core, the second assembly surface is provided with a receiving groove, the abutment parts can be embedded in the receiving groove, and the second elastic part forces the abutment parts to protrude from the second assembly surface and can be pressed against the first assembly surface.

[0017] A further solution is that the injection mold also includes a bolt, the second elastic member is a second return spring, the bolt is located in the accommodating groove, and the screw end of the bolt passes through the abutment and is connected to the bottom surface of the accommodating groove, the abutment can be pressed against the end face of the first assembly surface and a positioning groove is provided, the bolt head end of the bolt is located in the positioning groove, the second return spring is sleeved on the screw end of the bolt, and the two ends of the second return spring are respectively abutted between the bottom surface of the accommodating groove and the abutment, and in the moving direction of the abutment, the height of the positioning groove is greater than the height of the bolt head end of the bolt. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the first-person structural diagram of the fuel tank cap.

[0019] Figure 2 This is the second perspective structural diagram of the fuel tank cap.

[0020] Figure 3 This is an exploded view of the fuel tank cap.

[0021] Figure 4 It is a structural diagram of an injection mold embodiment of the present invention.

[0022] Figure 5 This is a structural diagram of a front mold structure arranged on a front mold plate in an embodiment of an injection mold of the present invention.

[0023] Figure 6 It is a partial structural exploded view of the front mold structure arranged on the front mold plate in the embodiment of the injection mold of the present invention.

[0024] Figure 7 It is a structural diagram of the first moving block in the injection mold embodiment of the present invention.

[0025] Figure 8 It is a structural diagram of the second moving block in the injection mold embodiment of the present invention.

[0026] Fig. 9 It is a structural diagram of the runner insert in the injection mold embodiment of the present invention.

[0027] Fig.10 It is a cross-sectional view of a runner insert in an embodiment of an injection mold of the present invention.

[0028] Fig.11 This is a first perspective structural diagram of the cooling insert in an injection mold embodiment of the present invention.

[0029] Fig.12 This is a second perspective structural diagram of the cooling insert in the injection mold embodiment of the present invention.

[0030] Fig.13 It is a partial cross-sectional view of the cooperation between the first sliding seat and the second sliding seat in the embodiment of the injection mold of the present invention.

[0031] Fig.14 It is a structural diagram of the rear mold structure arranged on the rear mold plate in the embodiment of the injection mold of the present invention.

[0032] Fig.15 This is a first partial structural exploded view of a rear mold structure disposed on a rear mold plate in an embodiment of an injection mold of the present invention.

[0033] Fig.16 This is a second partial structural exploded view of the rear mold structure arranged on the rear mold plate in the embodiment of the injection mold of the present invention.

[0034] Fig.17 It is a partial structural exploded view of the rotary demoulding structure arranged on the ejector plate in the embodiment of the injection mold of the present invention.

[0035] Fig.18 It is a partial structural cross-sectional view of a rotary demoulding structure arranged on an ejector plate in an embodiment of an injection mold of the present invention.

[0036] Fig.19 It is a structural diagram of the undercut demoulding structure arranged on the support plate in the embodiment of the injection mold of the present invention.

[0037] Fig. 20 It is a cross-sectional view of the cooperation between the first moving rod and the first moving seat in the injection mold embodiment of the present invention.

[0038] Fig.21 This is a structural diagram of the cooperation between the second moving rod and the second moving seat in an injection mold embodiment of the present invention.

[0039] Fig. 22 It is a cross-sectional view from a first perspective of an injection mold embodiment of the present invention.

[0040] Fig.23 yes Fig. 22 Enlarged view at A.

[0041] Fig.24 This is a cross-sectional view from a second perspective of an injection mold embodiment of the present invention.

[0042] Fig.25 This is a cross-sectional view from a third perspective of an injection mold embodiment of the present invention.

[0043] Fig.26 This is a sectional view from a fourth perspective of an injection mold embodiment of the present invention.

[0044] The present invention is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0045] See also Figures 1 to 3The fuel tank cap 1 comprises an opening cover 11, a main cover body 12 and a ring cover 13 connected in sequence. The circumference of the opening cover 11 is bent and extended axially with respect to its opening end 111, so that the inner cavity circumferential wall of the opening cover 11 has an inner buckle groove 112, and the outer circumferential wall of the opening end 111 of the opening cover 11 is provided with an inner concave ring groove 113. At the same time, the main cover body 12 has a hook end 121, and one end of the main cover body 12 away from the opening cover 11 is provided with four mounting holes 122. Moreover, the ring cover 13 is arranged in a closed ring at one end of the main cover body 12 away from the opening cover 11, and four avoidance holes 132 are fitted with the four mounting holes 122 one by one. The ring cover 13 is connected to the hook end 121 through a hooking structure, and an inner buckle hook 131 is formed with the hook end 121, and an inner groove 14 is formed between the outer wall of the hook end 121 and the outer wall of the ring cover 13. During the injection molding process, the main cover body 12 is firstly subjected to the first injection molding, and then the opening cover 11 and the ring cover 13 are subjected to the second injection molding on the main cover body 12 that has completed the first injection molding.

[0046] See also Figures 4 to 26 The present embodiment discloses an injection mold 2 for secondary injection molding of an opening cover 11 and a ring cover 13, comprising a front mold plate 21, a rear mold plate 22, a support plate 23, an ejector plate 26 and a mold support plate 25 arranged in sequence in the mold opening and closing directions, the support plate 23 being fixedly mounted on the mold support plate 25 via a support seat 24, a front mold core 235 being arranged on the end surface of the front mold plate 21 close to the rear mold plate 22, and a rear mold core 236 being arranged on the end surface of the rear mold plate 22 close to the front mold plate 21. The injection mold 2 of the present embodiment further comprises a rotary demolding structure, which is used for rotary demolding the fuel tank cap 1 product after secondary molding.

[0047] In this embodiment, a runner insert 27 is provided on the end surface of the front mold plate 21 close to the rear mold plate 22, and a mold cavity can be formed between the runner insert 27, the front mold core 235 and the rear mold core 236. In this embodiment, the runner insert 27 is provided in a disc shape, and a glue flow channel 271 is provided on the runner insert 27 and axially penetrates along the opening and closing direction of the injection mold 2. The glue inlet of the glue flow channel 271 is located on the first end surface of the runner insert 27 away from the rear mold plate 22 and docked with the glue inlet of the injection mold 2, and the glue discharge port of the glue flow channel 271 is located on the second end surface of the runner insert 27 close to the rear mold plate 22 and communicated with the mold cavity. The first end surface of the flow channel insert 27 is provided with an open annular groove 272, which is coaxially arranged with the flow channel insert 27. The open annular groove 272 extends in the axial direction of the flow channel insert 27 toward the second end surface of the flow channel insert 27. In the circumferential direction of the flow channel insert 27, the glue flow channel 271 is located between the two ends of the open annular groove 272. At the same time, the front template 21 is provided with a liquid inlet flow channel and a liquid discharge flow channel, and the two ends of the open annular groove 272 are respectively connected with the liquid inlet flow channel and the liquid discharge flow channel. The flow channel insert 27 corresponds to the opening end 111 of the opening cover 11. During the molding process, the coolant flows into the open-loop groove 272 of the flow channel insert 27 from the liquid inlet channel, and the coolant takes away the heat of the flow channel insert 27 and is discharged from the discharge channel, thereby cooling the flow channel insert 27 and the glue flow channel 271. Since the open-loop groove 272 is arranged in a circular ring shape, the flow channel insert 27 can obtain a uniform cooling effect, which plays a great role in improving the deformation of the opening end 111 of the opening cover 11, thereby improving the production yield and production efficiency.

[0048] Furthermore, in this embodiment, a cooling insert 28 is also provided on the end surface of the front template 21 close to the rear template 22, and a cavity can be formed between the cooling insert 28, the runner insert 27, the front mold core 235 and the rear mold core 236. In this embodiment, the cooling insert 28 includes an insert body 287, and a glue inlet flow channel 281 is opened through the insert body 287. The glue inlet of the glue inlet flow channel 281 is located on the first end surface of the insert body 287 away from the rear template 22 and docked with the glue inlet of the injection mold 2, and the glue outlet of the glue inlet flow channel 281 is located on the second end surface of the insert body 287 close to the rear template 22 and communicated with the cavity. Among them, a cooling flow channel 282 is provided inside the insert body 287 near the glue outlet, and the cooling flow channel 282 is arranged on the periphery of the glue inlet flow channel 281 in an arc-shaped extension. Moreover, the insert body 287 is also provided with a liquid inlet channel 283 and a liquid outlet channel 284, and the two ends of the cooling channel 282 are respectively connected to the liquid inlet channel 283 and the liquid outlet channel 284. The front template 21 is also provided with a liquid inlet channel and a liquid outlet channel, and the liquid inlet channel is connected to the liquid inlet channel 283 of the cooling insert 28, and the liquid outlet channel is connected to the liquid outlet channel 284 of the cooling insert 28. The cooling insert 28 is formed corresponding to the position of the avoidance hole 132 of the ring cover 13. During the molding process, the coolant flows from the liquid inlet channel into the liquid inlet channel 283 of the cooling insert 28, and then flows through the cooling channel 282 of the cooling insert 28 and flows into the liquid outlet channel 284 of the cooling insert 28. The coolant takes away the heat of the cooling insert 28 and is discharged from the liquid outlet channel, thereby cooling the cooling insert 28 and the glue inlet channel 281. Since the cooling channel 282 is arranged in an arc shape on the periphery of the glue inlet channel 281, the cooling insert 28 can obtain a uniform cooling effect as a whole, which plays a great role in improving the deformation and warping of the avoidance hole 132 of the ring cover 13, thereby improving the production yield and production efficiency.

[0049] Specifically, the first end face of the insert body 287 of this embodiment is provided with a threaded assembly hole 286, and the cooling insert 28 can be fastened and installed on the front mold plate 21 by means of a threaded fastener. At the same time, the peripheral wall of the insert body 287 connected between the first end face and the second end face of the insert body 287 is provided with a through-set T-shaped mounting hole 285, and the cooling insert 28 can be fastened and installed on the front mold core 235 by means of a T-shaped fastener. In order to further improve the cooling effect on the glue feed channel 281, the liquid feed channel 283 of this embodiment extends in the extension direction of the glue feed channel 281, and the liquid inlet of the liquid feed channel 283 is located on the first end face of the insert body 287, and the liquid outlet channel 284 extends in the extension direction of the glue feed channel 281, and the liquid outlet of the liquid outlet channel 284 is located on the first end face of the insert body 287. Since the cooling channel 282 is located inside the insert body 287, and the cooling channel 282 is arranged in an arc-shaped extension on the periphery of the glue inlet channel 281, the cooling insert 28 of the injection mold 2 of this embodiment is made by 3D printing, and the manufacturing process is simple, thereby shortening the production cycle of the mold and improving production efficiency.

[0050] The injection mold 2 of this embodiment further includes a first moving block 29, a first oblique guide column 213, a second moving block 210 and a second oblique guide column 214. The first moving block 29 and the second moving block 210 are movably located on the end surface of the front mold plate 21 close to the rear mold plate 22. A cavity can be formed between the first moving block 29, the second moving block 210, the runner insert 27, the front mold core 235 and the rear mold core 236. The first oblique guide column 213 is tilted relative to the mold opening and closing direction of the injection mold 2. The first end of the first oblique guide column 213 is arranged on the rear mold plate 22. The second end of the first oblique guide column 213 can be slidably inserted into the first moving block 29, so that the first moving block 29 can be moved perpendicular to the mold opening and closing direction, thereby demolding the inner concave annular groove 113 of the opening cover 11. Moreover, the second inclined guide pin 214 is arranged obliquely relative to the mold opening and closing direction of the injection mold 2, the first end of the second inclined guide pin 214 is arranged on the rear mold plate 22, and the second end of the second inclined guide pin 214 can be slidably inserted into the second movable block 210, so that the second movable block 210 can move perpendicular to the mold opening and closing direction. In this embodiment, the first movable block 29 is provided with a first liquid cooling channel 291 at one end close to the front mold core 235, and the first movable block 29 is also provided with a first inflow channel 292 and a first outflow channel 293, the two ends of the first liquid cooling channel 291 are respectively connected to the first inflow channel 292 and the first outflow channel 293, and the opening end of the first liquid cooling channel 291 is embedded with a first sealing member. At the same time, in this embodiment, a second liquid cooling channel 2103 is provided at one end of the second movable block 210 close to the front mold core 235, and the second movable block 210 is also provided with a second inlet channel 2101 and a second outlet channel 2102. The two ends of the second liquid cooling channel 2103 are respectively connected to the second inlet channel 2101 and the second outflow channel 2102, and a second sealing member is embedded in the open end of the second liquid cooling channel 2103. The first movable block 29 and the second movable block 210 correspond to the inner concave annular groove 113 of the opening cover 11, so the first movable block 29 and the second movable block 210 are symmetrically arranged about the front mold core 235. During the molding process, the coolant flows into the first liquid cooling channel 291 of the first movable block 29 from the first inflow channel 292, and the coolant takes away the heat of the first movable block 29 and is discharged from the first outflow channel 293. The coolant flows into the second liquid cooling channel 2103 of the second movable block 210 from the second inflow channel 2101, and the coolant takes away the heat of the second movable block 210 and is discharged from the second outflow channel 2102, thereby cooling down the first movable block 29 and the end of the second movable block 210 close to the front mold core 235, so that the first movable block 29 and the second movable block 210 can obtain a better cooling effect, which plays a great role in improving the deformation of the inner concave annular groove 113 of the opening cover 11, thereby improving the yield rate and production efficiency.

[0051] In order to improve the working accuracy and stability of the first moving block 29 and the second moving block 210, a first limiting column 237 and a second limiting column 239 are protrudingly provided on the end surface of the front template 21 close to the rear template 22. In the moving direction of the first moving block 29, the first limiting column 237 is located on the side of the first moving block 29 away from the front mold core 235, and in the moving direction of the second moving block 210, the second limiting column 239 is located on the side of the second moving block 210 away from the front mold core 235. When the first moving block 29 and the second moving block 210 perform the demolding action, the rear template 22 synchronously drives the first inclined guide column 213 and the second inclined guide column 214 to move away from the front template 21. Since the first inclined guide column 213 is tilted relative to the opening and closing direction of the injection mold 2, the second end of the first inclined guide column 213 can be slidably inserted into the first moving block 29, and the second inclined guide column 214 is tilted relative to the opening and closing direction of the injection mold 2, and the second end of the second inclined guide column 214 can be slidably inserted into the second moving block 210, so that the first inclined guide column 213 forces the first moving block 29 to move away from the front mold core 235 in a direction perpendicular to the opening and closing direction, and the second inclined guide column 214 forces the second moving block 210 to move away from the front mold core 235 in a direction perpendicular to the opening and closing direction, so as to realize the demolding of the concave annular groove 113 of the opening cover 11. When the first moving block 29 moves away from the front mold core 235 in a direction perpendicular to the mold opening and closing direction and abuts against the first limiting column 237, the first limiting column 237 forces the first moving block 29 to stop moving, and when the second moving block 210 moves away from the front mold core 235 in a direction perpendicular to the mold opening and closing direction and abuts against the second limiting column 239, the second limiting column 239 forces the second moving block 210 to stop moving, thereby preventing the first moving block 29 and the second moving block 210 from being separated from the front template 21, and ensuring that the moving blocks and the inclined guide columns can cooperate smoothly when the mold is closed. In order to further improve the working accuracy and stability of the first moving block 29, a first guide groove 292 is provided on the end surface of the front template 21 close to the rear template 22, and the first moving block 29 is provided with a first guide rail 291, which extends in the moving direction of the first moving block 29, and the first guide rail 291 can slidably cooperate with the first guide groove 292. Moreover, in order to further improve the working accuracy and stability of the second moving block 210, a second guide groove is arranged on the end face of the front template 21 close to the rear template 22, and the second moving block 210 is provided with a second guide rail 2101, which extends in the moving direction of the second moving block 210, and the second guide rail 2101 can be slidably matched with the second guide groove.

[0052] In addition, the injection mold 2 of this embodiment further includes a first sliding seat 211, a second sliding seat 212 and an inclined ejector column 215. The first sliding seat 211 is movably located on the end surface of the front template 21 close to the rear template 22. The inclined ejector column 215 is tilted relative to the mold opening and closing direction of the injection mold 2. The first end of the inclined ejector column 215 is arranged on the rear template 22. The second end of the inclined ejector column 215 is slidably inserted into the first sliding seat 211, so that the first sliding seat 211 can move perpendicular to the mold opening and closing direction. The first sliding seat 211 is provided with a first slide groove 2113, and the extension direction of the first slide groove 2113 is tilted relative to the mold opening and closing direction. The second sliding seat 212 is provided with a first slide rail, and the first slide rail can be slidably matched with the first slide groove 2113. The extension direction of the second sliding seat 212 is perpendicular to the extension direction of the first slide groove 2113. A cavity can be formed between one end of the second sliding seat 212 away from the first sliding seat 211, the first moving block 29, the second moving block 210, the runner insert 27, the front mold core 235 and the rear mold core 236. When the second sliding seat 212 is demolding, the rear mold plate 22 synchronously drives the inclined ejector column 215 to move away from the front mold plate 21. Since the inclined ejector column 215 is inclined relative to the opening and closing direction of the injection mold 2, the second end of the inclined ejector column 215 can be slidably inserted into the first sliding seat 211, so that the inclined ejector column 215 forces the first sliding seat 211 to move away from the front mold core 235 in a direction perpendicular to the opening and closing direction. Since the first sliding seat 211 is provided with a first sliding groove 2113, the extension direction of the first sliding groove 2113 is inclined relative to the mold opening and closing direction, the second sliding seat 212 is provided with a first sliding rail, and the first sliding rail can be slidably matched with the first sliding groove 2113. The extension direction of the second sliding seat 212 is perpendicular to the extension direction of the first sliding groove 2113. As the first sliding seat 211 moves away from the front mold core 235 in the direction perpendicular to the mold opening and closing direction, the second sliding seat 212 is synchronously driven to move away from the front mold core 235 in its own extension direction, thereby demolding the oblique buckle between the outer wall of the hook end 121 and the outer wall of the ring cover 13.

[0053] In order to improve the working accuracy and stability of the first sliding seat 211, a third limiting column 238 is protrudingly provided on the end surface of the front template 21 close to the rear template 22. In the moving direction of the first sliding seat 211, the third limiting column 238 is located on the side of the first sliding seat 211 away from the front mold core 235. When the first sliding seat 211 is demoulding, the inclined ejector column 215 forces the first sliding seat 211 to move away from the front mold core 235 in a direction perpendicular to the mold opening and closing. When the first sliding seat 211 moves away from the front mold core 235 in a direction perpendicular to the mold opening and closing and abuts against the third limiting column 238, the third limiting column 238 forces the first sliding seat 211 to stop moving, thereby preventing the first sliding seat 211 from separating from the front template 21 and ensuring that the first sliding seat 211 and the inclined ejector column 215 can cooperate smoothly when the mold is closed. In order to further improve the working accuracy and stability of the first sliding seat 211, a third guide groove 2112 is provided on the end face of the front template 21 close to the rear template 22, and the first sliding seat 211 is provided with a third guide rail 2111, which extends in the moving direction of the first sliding seat 211, and the third guide rail 2111 can be slidably matched with the third guide groove 2112.

[0054] In addition, the injection mold 2 of this embodiment further includes a first moving rod 229, a first moving seat 230, a second moving rod 231 and a second moving seat 232. The first moving seat 230 and the second moving seat 232 are respectively movably arranged on the rear mold core 236. A cavity can be formed between the first moving seat 230, the second moving seat 232, the second sliding seat 212, the first moving block 29, the second moving block 210, the runner insert 27, the front mold core 235 and the rear mold core 236. The first end of the first moving rod 229 is arranged on the support plate 23, the second end of the first moving rod 229 extends in the mold opening and closing direction and passes through the rear mold plate 22 and the rear mold core 236, and the first end of the second moving rod 231 is arranged on the support plate 23, the second end of the second moving rod 231 extends in the mold opening and closing direction and passes through the rear mold plate 22 and the rear mold core 236. The second end of the first moving rod 229 is provided with a second slide rail 2291, which is tilted relative to the mold opening and closing direction. The first moving seat 230 is provided with a second slide groove 2301, which can be slidably matched with the second slide rail 2291, so that the first moving seat 230 can move perpendicular to the mold opening and closing direction, thereby demolding the inner buckle groove 112 of the inner cavity peripheral wall of the opening cover 11. In addition, the second end of the second moving rod 231 is provided with a third slide rail 2311, which is tilted relative to the mold opening and closing direction. The second moving seat 232 is provided with a third slide groove 2321, which can be slidably matched with the third slide rail 2311, so that the second moving seat 232 can move perpendicular to the mold opening and closing direction, thereby demolding the inner buckle hook 131 of the hook end 121. In this embodiment, the first end of the first inclined guide column 213 , the first end of the second inclined guide column 214 , and the first end of the inclined top column 215 are all disposed on the support plate 23 .

[0055] The rotary demoulding structure of this embodiment includes a push rod 216, a linkage rod 225, an ejector head 219 and a first elastic member. The push rod 216 can move in its own extension direction. The linkage rod 225 extends in the extension direction of the push rod 216, and the linkage rod 225 and the push rod 216 are arranged side by side. The first elastic member forces the first end of the linkage rod 225 to approach the first end of the push rod 216 in the extension direction of the linkage rod 225. The first end of the push rod 216 is provided with a first hinge shaft 221 hinged to the ejector head 219, the first end of the linkage rod 225 is provided with a second hinge shaft 220 hinged to the ejector head 219, the ejector head 219 is provided with a first waist-shaped groove 2192, and the first hinge shaft 221 is inserted into the first waist-shaped groove 2192; and / or, the ejector head 219 is provided with a second waist-shaped groove 2193, and the second hinge shaft 220 is inserted into the second waist-shaped groove 2193. Among them, the second end of the ejector pin 216 of this embodiment is installed on the ejector plate 26, the first end of the ejector pin 216 extends in the mold opening and closing direction and passes through the support plate 23, the rear mold plate 22 and the rear mold core 236, and the first end of the linkage rod 225 extends in the mold opening and closing direction and passes through the support plate 23, the rear mold plate 22 and the rear mold core 236, the ejector head 219 is rotatably located at one end of the rear mold core 236 close to the front mold plate 21, and a cavity can be formed between the end of the ejector head 219 away from the ejector pin 216, the first movable seat 230, the second movable seat 232, the second sliding seat 212, the first movable block 29, the second movable block 210, the runner insert 27, the front mold core 235 and the rear mold core 236.

[0056] When the injection mold 2 is performing the product demoulding action, the ejector plate 26 controls the ejector pin 216 of the rotary demoulding structure to move in its own extension direction, that is, the ejector plate 26 controls the ejector pin 216 to move toward the front mold core 235 in the mold opening and closing direction, and the first hinge shaft 221 of the ejector pin 216 synchronously drives the ejector head 219 to move toward the front mold core 235 in the mold opening and closing direction. Since the linkage rod 225 can move elastically in the mold opening and closing direction, as one end of the ejector head 219 moves toward the front mold core 235 in the mold opening and closing direction, the second end of the ejector head 219 is forced to move the linkage rod 225 away from the front mold core 235 in the mold opening and closing direction through the second hinge shaft 220, thereby realizing the rotation of the ejector head 219 perpendicular to the mold opening and closing direction. Since the end of the ejector head 219 away from the ejector pin 216 is located in the inner groove 14 formed between the outer wall of the hook end 121 and the outer wall of the ring cover 13, as the ejector head 219 rotates perpendicular to the mold opening and closing direction, the ejector head 219 synchronously drives the secondary molded fuel tank cap 1 product to rotate and separate relative to the rear mold core 236, thereby rotating and demolding the product, and then the product can be removed from the ejector head 219 by the manipulator. When the injection mold 2 is in the mold closing action, the ejector plate 26 controls the ejector pin 216 to move away from the front mold core 235 in the mold opening and closing direction to reset, and the first hinge shaft 221 of the ejector pin 216 synchronously drives the ejector head 219 to move away from the front mold core 235 in the mold opening and closing direction to reset, thereby eliminating the force on the second end of the ejector head 219, and the first elastic member can force the first end of the linkage rod 225 to reset close to the first end of the ejector pin 216 in the extension direction of the linkage rod 225. The rotary demoulding structure of this embodiment can realize rotary demoulding of injection molded products, greatly improve the yield rate of injection molded products, and improve injection molding production efficiency. Moreover, the rotary demoulding structure of this embodiment has a simple and compact structure, is easy to install and disassemble, shortens the production cycle of the mold, and further improves production efficiency.

[0057] In order to improve the accuracy and stability of the cooperation between the top rod 216 and the linkage rod 225, the implementation method of this embodiment is that the side of the top rod 216 close to the linkage rod 225 is provided with a first limiting groove 2161, the first limiting groove 2161 extends in the extension direction of the top rod 216, and the side of the linkage rod 225 close to the top rod 216 is protrudingly provided with a first limiting block 2251, and the first limiting block 2251 is slidably located in the first limiting groove 2161. Alternatively, another implementation method is that the side of the linkage rod 225 close to the top rod 216 is provided with a second limiting groove, the second limiting groove extends in the extension direction of the top rod 216, and the side of the top rod 216 close to the linkage rod 225 is protrudingly provided with a second limiting block, and the second limiting block is slidably located in the second limiting groove.

[0058] In this embodiment, the ejector head 219 is provided with a first waist-shaped groove 2192, the first hinge shaft 221 is inserted into the first waist-shaped groove 2192, and the ejector head 219 is provided with a second waist-shaped groove 2193, the second hinge shaft 220 is inserted into the second waist-shaped groove 2193. The second waist-shaped groove 2193 and the first waist-shaped groove 2192 are arranged side by side, and the second waist-shaped groove 2193 and the first waist-shaped groove 2192 extend in the parallel direction of the second waist-shaped groove 2193 and the first waist-shaped groove 2192. Moreover, in the parallel direction of the second waist-shaped groove 2193 and the first waist-shaped groove 2192, the length of the first waist-shaped groove 2192 is greater than the length of the second waist-shaped groove 2193.

[0059] In order to improve the hinge working stability of the ejector head 219, the ejector rod 216 and the connecting rod 225, the ejector head 219 is provided with a groove 2191, the first waist-shaped groove 2192 and the second waist-shaped groove 2193 respectively penetrate the first side wall and the second side wall opposite to each other in the groove 2191, the first hinge shaft 221 penetrates the first end of the ejector rod 216, the second hinge shaft 220 penetrates the first end of the connecting rod 225, the first end of the ejector rod 216 is located in the groove 2191, and the two ends of the first hinge shaft 221 are respectively inserted into the first waist-shaped groove 2192 of the first side wall and the second side wall, the first end of the connecting rod 225 is located in the groove 2191, and the two ends of the second hinge shaft 220 are respectively inserted into the second waist-shaped groove 2193 of the first side wall and the second side wall.

[0060] In order to further improve the hinged working stability of the ejector pin 216 and the ejector head 219, as well as the precision and stability of the rotary demolding of the ejector head 219, the rotary demolding structure of this embodiment further includes a first guide plate 217 and a second guide plate 218 disposed on the rear mold core 236. The first guide plate 217 is provided with a first guide groove 2171, which extends in the extension direction of the ejector pin 216, and the first end of the first hinge shaft 221 is slidably located in the first guide groove 2171. The second guide plate 218 is provided with a second guide groove 2181, which extends in the extension direction of the ejector pin 216, and the second end of the first hinge shaft 221 is slidably located in the second guide groove 2181.

[0061] Specifically, the first elastic member of the present embodiment is a first return spring 227, and the rotary demoulding structure further includes a fixed seat 228 mounted on the mold carrier plate 25, and the two ends of the first return spring 227 are respectively abutted between the fixed seat 228 and the second end of the linkage rod 225. The rotary demoulding structure of the present embodiment further includes a push rod 226, which extends in the extension direction of the push rod 216, and the first end of the push rod 226 is connected to the second end of the linkage rod 225, and the second end of the push rod 226 is protrudingly provided with a guide rod 2261, and the end of the guide rod 2261 away from the linkage rod 225 is connected to the fixed seat 228. The first return spring 227 is sleeved on the guide rod 2261, and the two ends of the first return spring 227 are respectively abutted between the fixed seat 228 and the second end of the push rod 226.

[0062] In order to improve the smoothness and reliability of the rotational separation of the ejector head 219 relative to the rear mold core 236, the injection mold 2 of this embodiment also includes a buttress 223 and a second elastic member. The first assembly surface of the ejector head 219 of the rotary demolding structure can be in contact and cooperate with the second assembly surface of the rear mold core 236. The second assembly surface of the rear mold core 236 is provided with a receiving groove 2361. The buttress 223 can be embedded in the receiving groove 2361. The second elastic member forces the buttress 223 to protrude from the second assembly surface of the rear mold core 236 and can be pressed against the first assembly surface of the ejector head 219. Specifically, the second elastic member of the present embodiment is a second return spring 224, and the injection mold 2 further includes a bolt 222, the bolt 222 is located in the receiving groove 2361, and the screw end of the bolt 222 passes through the abutment member 223 and is connected to the groove bottom surface of the receiving groove 2361, and the abutment member 223 can be pressed against the end surface of the first assembly surface of the ejection head 219, and a positioning groove 2231 is provided, and the bolt head end 2221 of the bolt 222 is located in the positioning groove 2231. The second return spring 224 is sleeved on the screw end of the bolt 222, and the two ends of the second return spring 224 are respectively abutted between the groove bottom surface of the receiving groove 2361 and the abutment member 223. In the moving direction of the abutment member 223, the height H2 of the positioning groove 2231 is greater than the height H1 of the bolt head end 2221 of the bolt 222, so that the abutment member 223 has a sliding stroke relative to the bolt head end 2221 of the bolt 222. When the first hinge shaft 221 of the ejector pin 216 drives the ejector head 219 to rotate away from the rear mold core 236 in the mold opening and closing direction, the second return spring 224 forces the abutment member 223 to protrude from the second assembly surface of the rear mold core 236, so that the abutment member 223 presses against the first assembly surface of the ejector head 219, thereby giving the ejector head 219 a force to rotate away from the rear mold core 236, so that the ejector head 219 can smoothly and reliably rotate away from the rear mold core 236 and separate.

[0063] In order to improve the working accuracy and reliability of the ejector plate 26, a stabilizing rod 233 is provided on the ejector plate 26 of the present embodiment, and the free end of the stabilizing rod 233 extends in the opening and closing direction of the injection mold 2 and passes through the support plate 23 and the rear template 22, and a compression spring 234 is sleeved on the stabilizing rod 233, and the two ends of the compression spring 234 are respectively abutted between the ejector plate 26 and the rear template 22.

[0064] The above embodiments are only preferred examples of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structure, characteristics and principles of the patent application scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A rotary demoulding structure for an injection mold, characterized in that: It includes a push rod, a linkage rod, an ejection head and a first elastic member, and the push rod can move in its own extension direction; The linkage rod extends in the extension direction of the push rod, and the linkage rod and the push rod are arranged side by side, and the first elastic member forces the first end of the linkage rod to approach the first end of the push rod in the extension direction of the linkage rod; The first end of the ejector rod is provided with a first hinge shaft hinged to the ejector head, and the first end of the linkage rod is provided with a second hinge shaft hinged to the ejector head; The ejector head is provided with a first waist-shaped groove, and the first hinge shaft is inserted into the first waist-shaped groove; and / or the ejector head is provided with a second waist-shaped groove, and the second hinge shaft is inserted into the second waist-shaped groove; A first limiting groove is provided on a side of the push rod close to the linkage rod, and the first limiting groove extends in the extension direction of the push rod. A first limiting block is protrudingly provided on a side of the linkage rod close to the push rod, and the first limiting block is slidably located in the first limiting groove; Alternatively, a second limiting groove is provided on a side of the linkage rod close to the push rod, the second limiting groove extends in the extension direction of the push rod, and a second limiting block is protrudingly provided on a side of the push rod close to the linkage rod, and the second limiting block is slidably located in the second limiting groove; The ejector head is provided with the first waist-shaped groove, the first hinge shaft is inserted into the first waist-shaped groove, and the ejector head is provided with the second waist-shaped groove, the second hinge shaft is inserted into the second waist-shaped groove; The second waist-shaped groove and the first waist-shaped groove are arranged side by side, and the second waist-shaped groove and the first waist-shaped groove extend in the side-by-side direction of the second waist-shaped groove and the first waist-shaped groove.

2. The rotary demoulding structure of the injection mold according to claim 1, characterized in that: In the parallel direction of the second waist-shaped groove and the first waist-shaped groove, the length of the first waist-shaped groove is greater than the length of the second waist-shaped groove.

3. The rotary demoulding structure of the injection mold according to claim 1, characterized in that: The ejector head is provided with a groove, the first waist-shaped groove and the second waist-shaped groove respectively penetrate the first side wall and the second side wall of the groove which are opposite to each other, the first hinge shaft is arranged through the first end of the ejector rod, and the second hinge shaft is arranged through the first end of the linkage rod; The first end of the push rod is located in the groove, and the two ends of the first hinge shaft are respectively inserted into the first waist-shaped grooves of the first side wall and the second side wall; The first end of the linkage rod is located in the groove, and the two ends of the second hinge shaft are respectively inserted into the second waist-shaped grooves of the first side wall and the second side wall.

4. The rotary demoulding structure of the injection mold according to claim 3, characterized in that: The rotary demoulding structure of the injection mold further comprises a first guide plate, the first guide plate is provided with a first guide groove, the first guide groove extends in the extension direction of the ejector rod, and the first end of the first hinge shaft is slidably located in the first guide groove; and / or, The rotary demoulding structure of the injection mold further comprises a second guide plate, the second guide plate is provided with a second guide groove, the second guide groove extends in the extension direction of the ejector rod, and the second end of the first hinge shaft is slidably located in the second guide groove.

5. The rotary demoulding structure of the injection mold according to any one of claims 1 to 4, characterized in that: The rotary demoulding structure of the injection mold further includes a fixing seat, the first elastic member is a first return spring, and two ends of the first return spring are respectively abutted between the fixing seat and the second end of the linkage rod.

6. An injection mold, including a rotary demoulding structure, characterized in that: The rotary demoulding structure is the rotary demoulding structure of the injection mold according to any one of claims 1 to 5.

7. The injection mold according to claim 6, characterized in that: The injection mold comprises a rear mold core, an abutment member and a second elastic member, and the first assembly surface of the ejector head of the rotary demoulding structure can be in contact with and matched with the second assembly surface of the rear mold core; The second assembly surface is provided with a receiving groove, the abutment member can be embedded in the receiving groove, and the second elastic member forces the abutment member to protrude from the second assembly surface and can be pressed against the first assembly surface.

8. The injection mold according to claim 7, characterized in that: The injection mold further comprises a bolt, and the second elastic member is a second return spring; The bolt is located in the receiving groove, and the screw end of the bolt passes through the abutment member and is connected to the bottom surface of the receiving groove. The abutment member can be pressed against the end surface of the first assembly surface and is provided with a positioning groove, and the bolt head end of the bolt is located in the positioning groove; The second return spring is sleeved on the screw end of the bolt, and two ends of the second return spring are respectively abutted between the bottom surface of the accommodating groove and the abutment member; In the moving direction of the abutment member, the height of the positioning groove is greater than the height of the bolt head end of the bolt.

Images