Internal thread core-pulling mold

Abstract

The utility model relates to the technical field of dies, in particular to an internal thread core-pulling die which comprises an upper die unit and a lower die unit, and a limiting structure is arranged between the upper die unit and the lower die unit. Wherein at least one thread structure is arranged in the lower mold unit, the thread structure is used for being matched with a lower mold core of the lower mold unit to mold an internal thread on an injection molding part, a control structure is further arranged in the lower mold unit, and the control structure is used for driving the thread structure to rotate and move. The mode that the rack is fixed to the upper die unit is adopted, the connecting gear can be controlled to rotate through the rack while the die splitting action is achieved, the driving gear rotates at the same time, the two gears rotate at the same time, and due to the fact that the threaded rod rotates with the threaded sleeve in a threaded mode when the threaded rod rotates, the threaded sleeve can rotate with the threaded sleeve in a threaded mode. And the screw rod rotates and carries out synchronous transverse movement so as to finish the core pulling action between the screw rod and the product.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to an internal thread core-pulling mold. Background Art

[0002] Injection molding is a processing method used for mass production of certain complex-shaped parts. Specifically, it refers to the process of injecting heated, molten plastic into a mold cavity under high pressure using an injection molding machine, and then cooling and solidifying it to obtain a molded product. For some injection molds with threaded holes, a conventional internal thread core-pulling structure is generally adopted. The structure uses a servo motor to drive the motor transmission, and the screw is rotated and moved horizontally through gear matching. Specifically, a threaded core-pulling injection mold disclosed in Chinese patent announcement number "CN109605685B" includes a movable mold and a fixed mold; it also includes a guide slider, a mold core, a support, a shaft, a movable slider, a rotating gear and a drive motor; the support is fixedly installed on the fixed mold, and a slide groove is provided on the support; the movable slider is movably clamped in the slide groove; and guide sliders are provided on both sides of the movable slider.

[0003] Due to the motor control method, it is difficult to synchronize the injection molding machine and the servo motor in the actual production process, so that the thread shaft will continue to rotate after reaching the speed limit, which is easy to damage the mold. Based on this, in order to further improve the core pulling stability of internal thread products, we propose an internal thread core pulling mold. Utility Model Content

[0004] The purpose of the utility model is to solve the above-mentioned shortcomings in the prior art and to propose an internal thread core-pulling die.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] An internal thread core-pulling die is designed, comprising an upper die unit and a lower die unit, wherein a limiting structure is provided between the upper die unit and the lower die unit;

[0007] Among them, at least one threaded structure is provided in the lower mold unit, and the threaded structure is used to cooperate with the lower mold core of the lower mold unit to form an internal thread on the injection molded part. The lower mold unit is also provided with a control structure, and the control structure is used to drive the threaded structure to rotate and displace to achieve separation from the injection molded part. The upper mold unit is provided with a driving structure, and the driving structure is used to drive the control structure to move.

[0008] Furthermore, the limiting structure includes a fixed frame fixed to the upper mold unit by fasteners, and a guide member is fixedly installed on the outer side of the lower mold unit, and the guide member slides in the inner notch of the fixed frame.

[0009] Furthermore, the threaded structure includes a fixing seat fixed to the upper end of the lower mold unit, a threaded sleeve is embedded in the fixing seat, the inner side of the threaded sleeve is threadedly connected to a screw, the end of the screw has a forming part, and the forming part is located inside the lower mold core.

[0010] Furthermore, the fixing seat is assembled by a left plate, a middle plate and a right plate through connecting parts, the threaded sleeve is built into the middle plate, and a gear is also fixed at the end of the screw.

[0011] Furthermore, the control structure includes a driving gear rotatably connected to the lower mold unit, and the driving gear is engaged with the gear for transmission to drive the screw to engage with the threaded sleeve to achieve lateral movement.

[0012] Furthermore, the driving structure includes a rack fixed on the side of the upper mold unit, a connecting gear is coaxially connected to the driving gear, the connecting gear is engaged with the rack for transmission, and a shielding cover is also fixedly installed on the side of the lower mold unit, and the shielding cover is mounted on the outside of the driving structure.

[0013] The utility model proposes an internal thread core-pulling mold, which has the following beneficial effects: in the utility model, a rack is fixed on the upper mold unit to realize the rotation of the connecting gear through the rack during the mold separation action, so as to realize the simultaneous rotation of the driving gear and the two gears. Since the screw rotates simultaneously with the threaded sleeve thread when rotating, the screw can be rotated and moved horizontally synchronously during mold separation to complete the core-pulling action between the product. The entire action is synchronously controlled by the mold separation action between the upper mold unit and the lower mold unit, so that the consistency of the action can be guaranteed. Secondly, the control of the core-pulling distance by the limiting structure can limit the movable distance between the rack and the connecting gear to achieve precise positioning, thereby ensuring that the tooth stripping and mold life are met. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional diagram of the utility model;

[0015] Figure 2 This is a schematic diagram of the control structure of the utility model;

[0016] Figure 3 This is a schematic structural diagram of the fixing seat of the present utility model.

[0017] In the figure: 1. Upper mold unit; 2. Lower mold unit; 21. Lower mold core; 3. Limiting structure; 31. Fastener; 32. Fixing frame; 33. Guide member; 4. Threaded structure; 41. Fixing seat; 411. Left side plate; 412. Middle plate; 413. Right side plate; 42. Threaded sleeve; 43. Screw; 44. Forming part; 45. Gear; 5. Control structure; 51. Drive gear; 52. Connecting gear; 6. Drive structure; 61. Rack; 62. Shielding cover; 7. Product. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] Reference Figure 1-3 This is an embodiment of the present invention, which discloses an internal thread core-pulling mold, which includes an upper mold unit 1 and a lower mold unit 2. Those skilled in the art know that the upper mold unit 1 includes an upper fixed plate, an upper mold, and an upper mold core, and the lower mold unit 2 includes a lower fixed plate, a side plate, a top mold structure, a lower mold plate, and a lower mold core 21. The specific structure is the existing technology that can be known to those skilled in the art without any technical obstacles, so it will not be described in detail. In this utility model, the core-pulling structure of the injection molded product 7 is specifically described in detail;

[0020] Specifically, a limiting structure 3 is provided between the upper mold unit 1 and the lower mold unit 2; wherein, at least one threaded structure 4 is provided in the lower mold unit 2, and the threaded structure 4 is used to cooperate with the lower mold core 21 of the lower mold unit 2 to form an internal thread on the injection molded part. The lower mold unit 2 is also provided with a control structure 5, and the control structure 5 is used to drive the threaded structure 4 to rotate and displace to achieve separation from the injection molded part. A driving structure 6 is provided on the upper mold unit 1, and the driving structure 6 is used to drive the control structure 5 to move.

[0021] In some embodiments, the limiting structure 3 in the present invention includes a fixed frame 32 fixed to the upper mold unit 1 by a fastener 31. Preferably, the fastener 31 described in this embodiment is set as a bolt member, and a guide member 33 is fixedly installed on the outer side of the lower mold unit 2. Of course, the guide member 33 described in this embodiment can also be set as a bolt member, and the guide member 33 slides in the inner groove of the fixed frame 32, that is, in this embodiment, the guide member 33 on the lower mold unit 2 is used to limit the rising height of the fixed frame 32, so that the movable distance between the rack 61 and the connecting gear 52 can be limited to achieve precise positioning, thereby ensuring that the tooth stripping and mold life are met.

[0022] Furthermore, the threaded structure 4 in this embodiment includes a fixed seat 41 fixed at the upper end of the lower mold unit 2, and a threaded sleeve 42 is embedded in the fixed seat 41. The inner side of the threaded sleeve 42 is threadedly connected to a screw 43, and the end of the screw 43 has a forming portion 44. The forming portion 44 is located inside the lower mold core 21. It is further explained that the forming portion 44 in this embodiment is set as a threaded portion to cooperate with the upper mold core and the lower mold core 21 during injection molding, and is used to form the internal threaded hole of the product. In addition, in this embodiment, when the screw 43 and the threaded sleeve 42 rotate, the screw 43 will simultaneously move to a horizontal position, so that the core-pulling action with the product 7 can be realized.

[0023] On the basis of the above embodiments, the fixed seat 41 in the present invention is assembled by a left plate 411, a middle plate 412 and a right plate 413 through connecting parts. The threaded sleeve 42 is built into the middle plate 412, and a gear 45 is fixed at the end of the screw 43. In addition, bearings can be embedded in the left plate 411 and the right plate 413 to support the screw 43 through the bearings to improve its rotation stability.

[0024] Specifically, the control structure 5 in the embodiment of the present invention includes a driving gear 51 rotatably connected to the lower mold unit 2, and the driving gear 51 is engaged with the gear 45 for transmission to drive the screw 43 to engage with the threaded sleeve 42 to achieve lateral movement. Preferably, there are two threaded structures 4 in this embodiment, that is, the upper mold core and the lower mold core 21 can simultaneously realize the molding of two products 7. Furthermore, the driving gear 51 in this embodiment is engaged on both sides of the two gears 45 to achieve a synchronous core pulling effect.

[0025] On the basis of the above embodiments, the driving structure 6 in this embodiment includes a rack 61 fixed on the side of the upper mold unit 1, and a connecting gear 52 is coaxially connected to the driving gear 51. The connecting gear 52 is engaged with the rack 61 for transmission. A shielding cover 62 is also fixedly installed on the side of the lower mold unit 2. The shielding cover 62 is sleeved on the outside of the driving structure 6. The shielding cover 62 is used to protect the connection between the rack 61 and the connecting gear 52. While improving the protection of both, it can also avoid damage to the human body due to accidental contact.

[0026] In summary, the present invention adopts a method of fixing the rack 61 on the upper mold unit 1 to realize that during the mold separation action, the rack 61 can be used to control the rotation of the connecting gear 52, so as to realize the rotation of the driving gear 51 and the two gears 45 at the same time. Since the screw 43 will rotate with the threaded sleeve 42 at the same time when rotating, it can be achieved that during the mold separation, the screw 43 rotates and performs a synchronous transverse movement to complete the core pulling action between the product 7. The entire action is synchronously controlled by the mold separation action between the upper mold unit 1 and the lower mold unit 2, so that the consistency of the action can be guaranteed. Secondly, the control of the core pulling distance by the limiting structure 3 can limit the movable distance between the rack 61 and the connecting gear 52, so as to achieve precise positioning, thereby ensuring that the tooth stripping and mold life are met.

[0027] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An internal thread core-pulling die, comprising an upper die unit (1) and a lower die unit (2), characterized in that: A limiting structure (3) is provided between the upper die unit (1) and the lower die unit (2); The lower mold unit (2) is provided with at least one thread structure (4), and the thread structure (4) is used to cooperate with the lower mold core (21) of the lower mold unit (2) to form an internal thread on the injection molded part. The lower mold unit (2) is also provided with a control structure (5), and the control structure (5) is used to drive the thread structure (4) to rotate and move to achieve separation from the injection molded part. The upper mold unit (1) is provided with a driving structure (6), and the driving structure (6) is used to drive the control structure (5) to move.

2. The internal thread core-pulling die according to claim 1, characterized in that: The limiting structure (3) comprises a fixed frame (32) fixed to the upper mold unit (1) by a fastener (31), and a guide member (33) is fixedly installed on the outer side of the lower mold unit (2), and the guide member (33) slides in the inner notch of the fixed frame (32).

3. The internal thread core-pulling die according to claim 1, characterized in that: The threaded structure (4) includes a fixing seat (41) fixed to the upper end of the lower mold unit (2), a threaded sleeve (42) is embedded in the fixing seat (41), the inner side of the threaded sleeve (42) is threadedly connected to a screw rod (43), the end of the screw rod (43) has a forming portion (44), and the forming portion (44) is located inside the lower mold core (21).

4. The internal thread core-pulling die according to claim 3, characterized in that: The fixing seat (41) is assembled by a left side plate (411), a middle plate (412) and a right side plate (413) through connecting pieces. The threaded sleeve (42) is built into the middle plate (412). A gear (45) is also fixed to the end of the screw rod (43).

5. The internal thread core-pulling die according to claim 4, characterized in that: The control structure (5) includes a driving gear (51) rotatably connected to the lower die unit (2), and the driving gear (51) is engaged with the gear (45) for transmission to drive the screw (43) to engage with the threaded sleeve (42) to achieve lateral movement.

6. The internal thread core-pulling die according to claim 5, characterized in that: The driving structure (6) includes a rack (61) fixed on the side of the upper mold unit (1); a connecting gear (52) is coaxially connected to the driving gear (51); the connecting gear (52) and the rack (61) are meshed and driven; a shielding cover (62) is also fixedly installed on the side of the lower mold unit (2); the shielding cover (62) is sleeved on the outside of the driving structure (6).

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