Threaded mold core stripping mechanism of threaded injection molding part

Abstract

The utility model discloses a thread mold core stripping mechanism of a thread injection molding part. The thread mold core stripping mechanism comprises a thread mold core, a wrench sleeve and a mold core driving mechanism, the top of the threaded mold core is spirally connected with a threaded injection-molded part; the mold core driving mechanism comprises a power source, a transmission mechanism and a driving wheel, the power source is in transmission connection with the driving wheel through the transmission mechanism so as to drive the driving wheel to rotate, and the spanner sleeve is arranged outside the threaded mold core in a sleeving mode in a mode that the spanner sleeve cannot rotate relative to the threaded mold core and can drive the threaded mold core to rotate synchronously; the driving wheel is arranged outside the wrench sleeve in a sleeving mode so as to drive the wrench sleeve to rotate synchronously. According to the utility model, the thread mold core can be smoothly and quickly separated from the thread injection molding part, the thread injection molding part is not easy to damage, and the implementation cost is low.

Description

Technical Field

[0001] The utility model relates to injection mold technology. Background Art

[0002] When producing injection molded parts with continuous threads, a rotatable thread core is installed on the corresponding injection mold. During demoulding, the thread core is driven by the gear or sprocket on the mold to rotate, so that the threaded injection molded part is unscrewed.

[0003] Figure 1 The figure shows a schematic structural diagram of a thread mold core ejection mechanism of an existing thread injection molded part. Figure 1 As shown, the conventional threaded mold core ejection mechanism for a threaded injection molded part includes a threaded mold core 91, a threaded copper sleeve 92, a gear 93, and a guide copper sleeve 94. A threaded hole 910 is formed on the top surface of the threaded mold core 91, into which the threaded injection molded part 100 is screwed. The threaded copper sleeve 92, gear 93, and guide copper sleeve 94 are respectively sleeved over the threaded mold core 91. The threaded copper sleeve 92 is screwed to the threaded mold core 91, while the gear 93 is keyed to the threaded mold core 91. The thread pitch of the threaded copper sleeve 92 is the same as that of the threaded injection molded part 100.

[0004] When the threaded mold core 91 is to be unscrewed from the threaded injection molded part, the motor is controlled to drive the gear 93 to rotate, causing the threaded mold core 91 to move downward, thereby separating from the threaded injection molded part 100. The guide copper sleeve 94 guides the displacement of the threaded mold core 91. After opening the injection mold, the threaded injection molded part 100 is removed, and the motor is then rotated again to return the threaded mold core 91 to its original position. The mold is then reclosed for the next injection molding.

[0005] The existing thread mold core ejection mechanism of threaded injection molded parts has the following main disadvantages: 1. Since the thread pitch of the threaded copper sleeve needs to be processed to be the same as the thread pitch of the threaded injection molded part, the processing accuracy requirement is high, which increases the manufacturing cost; 2. The threads of the threaded copper sleeve and the threaded mold core are easily bitten, and the threaded mold core cannot be smoothly ejected from the threaded injection molded part; 3. During the downward movement of the threaded mold core, the threaded injection molded part is subjected to a large force, which can easily cause the threaded part of the threaded injection molded part to be squeezed and damaged, affecting product quality. Summary of the Invention

[0006] The technical problem to be solved by the utility model is to provide a thread mold core ejection mechanism for a threaded injection molded part, which can realize smooth and rapid ejection of the thread mold core from the threaded injection molded part without easily damaging the threaded injection molded part and has low implementation cost.

[0007] An embodiment of the utility model provides a threaded mold core ejection mechanism for a threaded injection molded part, comprising a threaded mold core and a mold core driving mechanism; the top of the threaded mold core is used to be spirally connected to the threaded injection molded part; the mold core driving mechanism comprises a power source, a transmission mechanism and a driving wheel, the power source is connected to the driving wheel through the transmission mechanism to drive the driving wheel to rotate, and its characteristic is that the threaded mold core ejection mechanism of the threaded injection molded part comprises a wrench socket, the wrench socket is sleeved on the outside of the threaded mold core in a manner that it cannot rotate relative to the threaded mold core, and can drive the threaded mold core to rotate synchronously; the driving wheel is sleeved on the outside of the wrench socket to drive the wrench socket to rotate synchronously.

[0008] The utility model has at least the following advantages:

[0009] 1. Compared with the threaded copper sleeve of the prior art, the wrench socket of the embodiment of the utility model is easier to manufacture, reduces the manufacturing cost, and does not cause the thread to be stuck, thereby realizing the smooth removal of the thread mold core from the threaded injection molded part;

[0010] 2. The embodiment of the utility model adopts a wrench socket to rotate the thread mold core, which reduces the force on the threaded injection molded part and does not cause damage to the threaded portion of the threaded injection molded part, thereby improving the quality of the injection molded part.

[0011] 3. Compared with the prior art, the threaded mold core of this embodiment rotates less times, thereby increasing its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The present invention shows a structural schematic diagram of a thread mold core ejection mechanism of an existing thread injection molded part.

[0013] Figure 2 A structural schematic diagram of a threaded mold core ejection mechanism for a threaded injection molded part according to an embodiment of the present invention is shown.

[0014] Figure 3 A structural schematic diagram of a thread mold core according to an embodiment of the present utility model is shown. DETAILED DESCRIPTION

[0015] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0016] Please refer to Figures 1 to 3 According to an embodiment of the present invention, a threaded mold core ejection mechanism for a threaded injection molded part includes a threaded mold core 1, a wrench socket 2, a plurality of bearings 3, and a mold core driving mechanism.

[0017] The top of the threaded mold core 1 is used for screw connection with the threaded injection molded part 100. In this embodiment, the top surface of the threaded mold core 1 is provided with a threaded hole 10 for screw connection with the threaded injection molded part 100.

[0018] The wrench socket 2 is mounted on the thread core 1 in a manner that prevents rotation relative to the thread core 1, while simultaneously driving the thread core 1 to rotate. In this embodiment, the thread core 1 comprises a core body 1a and an anti-rotation mating portion 1b, the top of which is connected to the bottom of the core body 1a. The anti-rotation mating portion 1b extends into the center hole 20 of the wrench socket 2. The contact surface between the anti-rotation mating portion 1b and the center hole 20 of the wrench socket has an anti-rotation shape, which includes but is not limited to polygonal shapes such as squares and hexagons.

[0019] Furthermore, a stopper 11 is provided at the bottom of the core body 1a; the central hole 20 of the wrench socket 2 is a stepped hole, comprising a first hole section 201 with a larger aperture and a second hole section 202 with a smaller aperture. The top end of the first hole section 201 opens to the top surface of the wrench socket 2, and the bottom end of the first hole section 201 is connected to the top end of the second hole section 202, forming a stepped surface 203 between the first hole section 201 and the second hole section 202. The stepped surface 203 is used to abut against the stopper 11 to limit the travel of the threaded core 1. In this embodiment, the stopper 11 is an annular flange provided at the bottom of the core body 1a and extending radially.

[0020] The bottom of the core body 1a extends into the first hole section 201, and the anti-rotation fitting portion 1b extends into the second hole section 202. Figure 3 In the example, the anti-rotation fitting portion 1b is in the shape of a cube, the second hole segment 202 is a square hole, and the contact surface between the anti-rotation fitting portion 1b and the second hole segment 202 is a square.

[0021] Multiple bearings 3 are respectively mounted on the outside of the wrench socket 2 and fixed to the fixed plate 82 of the injection mold of the threaded injection molded part 100. The bottom end of the fixed plate 82 is connected to the bottom plate 81 of the injection mold. The wrench socket 2 is supported on the bottom plate 81, so that the wrench socket 2 is rotatably but not axially movable in the injection mold of the threaded injection molded part.

[0022] The core drive mechanism includes a power source 41, a transmission mechanism and a drive wheel 43. The power source 41 is connected to the drive wheel 43 through the transmission mechanism to drive the drive wheel 43 to rotate. Optionally, the drive wheel 43 is a sprocket or a gear; the power source 41 is a motor. In some specific embodiments, the drive wheel 43 adopts a sprocket, and the transmission mechanism includes a driving sprocket 421 and a chain (not shown in the figure), the driving sprocket 421 is mounted on the output shaft of the motor, and the chain is wound around the driving sprocket 421 and the outside of the drive wheel 43. In other embodiments, the drive wheel 43 adopts a gear, and the transmission mechanism includes a driving gear mounted on the output shaft of the motor, and the driving gear is engaged with the drive wheel 43.

[0023] The driving wheel 43 is sleeved on the outside of the wrench socket 2 to drive the wrench socket 2 to rotate synchronously. In this embodiment, the driving wheel 43 is key-connected to the wrench socket 2.

[0024] Furthermore, the threaded mold core ejection mechanism of this embodiment also includes a guide sleeve 5, which is mounted on the threaded mold core 1 and fixed to the mold frame 86 of the injection mold for the threaded injection molded part. The guide sleeve 5 guides the movement of the threaded mold core 1 and can be made of a metal such as copper. The mold core 87 of the injection mold is mounted on the mold frame 86.

[0025] Furthermore, the aforementioned injection mold includes a pair of vertically movable ejector pins 6 that pass through a guide sleeve 5 and are used to eject the threaded injection molded part 100 from the mold. The pair of ejector pins 6 are fixed to an ejector panel 83a of the injection mold, which is connected to an ejector base plate 83b. The ejector panel 83a and the ejector base plate 83b are positioned between two mold legs 84. The top ends of the two mold legs 84 are connected to a backing plate 85, and the bottom ends of the two mold legs 84 are connected to a fixed plate 82. A mold frame 86 is pressed against and connected to the backing plate 85.

[0026] When threaded mold core 1 needs to be unscrewed from threaded injection molded part 100, the motor drives drive wheel 43 to rotate wrench sleeve 2, thereby unscrewing threaded mold core 1 from threaded injection molded part 100. Ejector pin 6 then ejects threaded injection molded part 100 from the mold. This ejector pin eliminates the risk of mold compression and reduces maintenance risks. During a molding cycle, the motor only needs to rotate once, allowing the mold to open and close naturally.

[0027] The threaded mold core ejection mechanism of the threaded injection molded part of this embodiment helps to achieve fully automated production with high efficiency and high yield.

[0028] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. A threaded mold core ejection mechanism for a threaded injection molded part, comprising a threaded mold core and a mold core drive mechanism; the top of the threaded mold core is used to be screwed together with the threaded injection molded part; the mold core drive mechanism comprises a power source, a transmission mechanism, and a drive wheel, the power source being connected to the drive wheel through the transmission mechanism to drive the drive wheel to rotate, characterized in that: The thread mold core ejection mechanism of the threaded injection molded part includes a wrench sleeve, which is sleeved on the outside of the thread mold core in a manner that it cannot rotate relative to the thread mold core and can drive the thread mold core to rotate synchronously; The driving wheel is sleeved on the outside of the wrench socket to drive the wrench socket to rotate synchronously.

2. The thread mold core ejection mechanism for a threaded injection molded part according to claim 1, wherein: The threaded mold core includes a mold core body and an anti-rotation fitting portion, wherein the top end of the anti-rotation fitting portion is connected to the bottom end of the mold core body; The anti-rotation fitting portion extends into the central hole of the wrench sleeve, and the contact surface between the anti-rotation fitting portion and the central hole of the wrench sleeve has an anti-rotation shape.

3. The thread mold core ejection mechanism of a threaded injection molded part according to claim 2, wherein: The core body is provided with a stopper; The central hole of the wrench socket is a stepped hole, comprising a first hole section with a larger hole diameter and a second hole section with a smaller hole diameter. The top end of the first hole section opens to the top surface of the wrench socket, and the bottom end of the first hole section is connected to the top end of the second hole section. A stepped surface is formed between the first hole section and the second hole section, and the stepped surface is used to abut against the stop portion to limit the movement stroke of the threaded mold core. The bottom of the mold core body extends into the first hole section, and the anti-rotation fitting portion extends into the second hole section.

4. The thread mold core ejection mechanism for a threaded injection molded part according to claim 3, wherein: The stopper is an annular flange which is arranged at the bottom of the mold core body and extends radially.

5. The thread mold core ejection mechanism for a threaded injection molded part according to claim 1, wherein: The top surface of the threaded mold core is provided with a threaded hole for spiral connection with the threaded injection molded part.

6. The thread mold core ejection mechanism for a threaded injection molded part according to claim 1, wherein: The driving wheel is connected to the wrench socket key.

7. The thread mold core ejection mechanism for a threaded injection molded part according to claim 1, wherein: The driving wheel is a sprocket or a gear; The power source is a motor.

8. The thread mold core ejection mechanism for a threaded injection molded part according to claim 1, wherein: The threaded mold core ejection mechanism of the threaded injection molded part comprises a guide sleeve, which is sleeved outside the threaded mold core and fixed to the injection mold of the threaded injection molded part.

9. The thread mold core ejection mechanism for a threaded injection molded part according to claim 8, wherein: The injection mold comprises a pair of ejector pins which can move up and down. The pair of ejector pins passes through the guide sleeve and is used for ejecting the threaded injection molded part out of the injection mold.

10. The thread mold core ejection mechanism for a threaded injection molded part according to claim 1, wherein: The threaded mold core ejection mechanism of the threaded injection molded part includes multiple bearings, which are respectively sleeved on the outside of the wrench sleeve and fixed to the fixed plate of the injection mold of the threaded injection molded part. The bottom end of the fixed plate is connected to the bottom plate of the injection mold.

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