Internal drawing type injection mold for sewing machine

Abstract

The utility model relates to an internal drawing type injection mold for a sewing machine, which comprises an upper mold base, a lower mold base and a core-pulling assembly, the upper mold base and the lower mold base are respectively provided with an upper mold cavity and a lower mold cavity for injection molding, and the core-pulling assembly comprises a core-pulling base, a limiting plate and a reset spring; when the upper mold base and the lower mold base are closed, the two groups of core-pulling bases move towards the lower mold cavity through the guide grooves, the shaping block moves to a preset position, the reset spring is compressed, after injection molding is cooled, the upper mold base and the lower mold base are opened, the core-pulling bases are reset under the action of the reset spring, and the core-pulling bases are separated from the upper mold base and the lower mold base. And the injection molding piece is prevented from interfering with the shaping block during demolding, so that the injection molding piece is formed at one time, secondary processing is not needed, and the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of mould, especially relates to a sewing machine is with internal drawing type injection mold. BACKGROUND

[0002] The core-pulling structure of injection mold usually involves the movement of the complex structure inside the mold, especially for handling the complex structure different from the demolding direction, the core-pulling structure is usually installed on the parting surface of the mold, the movement of the slider is controlled by the motorized core-pulling mode such as air cylinder, the slider is ensured to move along the correct direction, and the slider is in the correct position when the mold is closed or opened.

[0003] When producing the shell accessory of the sewing machine, if two groups of traditional core-pulling structures are used to handle the side hole structure, interference between the two groups of core-pulling structures will be caused, therefore, a new core-pulling structure needs to be designed to produce the accessory, so as to ensure the product quality and improve the production efficiency. SUMMARY

[0004] In order to overcome the defects in the background art, the utility model adopts the technical scheme: a sewing machine is with internal drawing type injection mold, including upper die holder, lower die holder and core-pulling assembly, the upper die holder and the lower die holder are respectively provided with upper die cavity and lower die cavity for injection molding, the core-pulling assembly includes core-pulling seat, limiting plate and return spring, the lower die holder is provided with one group of mounting grooves, the two sides of the mounting groove are connected with the limiting plate, and the limiting plate and the mounting groove form a sliding groove for slidingly connecting the core-pulling seat, the upper die holder is provided with a guide groove for moving the core-pulling seat, the core-pulling seat is provided with a return spring for demolding, and the core-pulling seat is provided with a shaping block for side pulling in the direction of the upper die cavity.

[0005] By adopting the above technical scheme, the shell accessory of the sewing machine is provided with two groups of vertically distributed side cavities, if the traditional core-pulling structure is used, interference between the core-pulling rods will be caused, the lower die holder is provided with two groups of mounting grooves in different directions, and the movable core-pulling seat is arranged in the mounting groove, when the upper die holder and the lower die holder are closed, the two groups of core-pulling seats are moved in the direction of the lower die cavity through the guide groove, and the shaping block is moved to the preset position, the return spring is compressed, after injection cooling, the upper die holder and the lower die holder are opened, at this time, the core-pulling seat is reset through the action of the return spring, and the shaping block is driven away from the injection molded part, so as to avoid interference between the injection molded part and the shaping block during demolding, the overall structure is reasonable in design and convenient to install.

[0006] The utility model is further provided with a step surface on the two sides of the mounting groove, a first threaded hole is arranged on the step surface, the limiting plate is screw-connected to the two sides of the mounting groove through the first threaded hole, the core-pulling seat is provided with a clamping part matched with the sliding groove, and the core-pulling seat is slidingly connected to the sliding groove through the clamping part.

[0007] Further, the guide groove is provided with an inclined surface in the direction away from the upper die cavity.

[0008] By the above technical scheme, the clamping part of the core-pulling base is connected to the sliding groove through the limiting plate, in the die closing process, the core-pulling base is clamped into the guide groove, and the core-pulling base is pushed towards the lower die cavity through the inclined surface until the core-pulling base is completely embedded into the guide groove, and the structure is suitable for the core-pulling base with low height and low required matching precision.

[0009] The core-pulling base is provided with an inclined hole corresponding to the bolt.

[0010] Further, the upper die seat is provided with an adapter block, the adapter block is provided with a countersunk hole for mounting the bolt, the guide groove is provided with a second threaded hole, and the adapter block is connected to the guide groove through the second threaded hole.

[0011] By the above technical scheme, the bolt is fixedly inclined downward through the countersunk hole, in the die closing process, the bolt is clamped into the inclined hole, the core-pulling base is pushed towards the lower die cavity through the bolt until the core-pulling base is completely embedded into the guide groove, and the structure is suitable for the core-pulling base with high height and high required matching precision.

[0012] The core-pulling base is provided with a mounting hole for mounting a return spring, and the two ends of the mounting groove are respectively provided with a fixed surface for abutting against the return spring and a limiting surface for abutting against the core-pulling base.

[0013] Further, the fixed surface is provided with a trapezoidal groove matched with the shaping block, the upper die seat is provided with a rectangular groove corresponding to the trapezoidal groove, and the shaping block is connected between the trapezoidal groove and the rectangular groove.

[0014] By the above technical scheme, the trapezoidal groove and the rectangular groove are combined to form an external contour matched with the shaping block, so that the material overflow is avoided in the injection molding, and the overflow material does not affect the normal work of the core-pulling structure.

[0015] Compared with the prior art, the utility model has the advantages of:

[0016] When the upper die seat and the lower die seat are closed, the two groups of core-pulling bases are moved towards the lower die cavity through the guide groove, the shaping blocks are moved to the preset positions, and the return springs are compressed, after the injection molding and cooling, the upper die seat and the lower die seat are opened, the core-pulling bases are reset through the action of the return springs, and the shaping blocks are driven away from the injection molded part, so that the interference between the injection molded part and the shaping blocks is avoided in the demolding, the injection molded part is one-time formed, secondary processing is not needed, and the production efficiency is improved.

[0017] The utility model embodiment is further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the perspective view of the utility model;

[0019] Figure 2 It is the structure schematic view of the side extraction assembly installed in the lower die seat of the utility model;

[0020] Figure 3 It is the partial enlarged view of the lower die seat of the utility model;

[0021] Figure 4 It is the structure explosion drawing of the upper die seat of the utility model;

[0022] Figure 5 It is the perspective view of the first implementation of the core pulling seat of the utility model;

[0023] Figure 6 It is the perspective view of the second implementation of the core pulling seat of the utility model; Figure 4 It is the partial enlarged view of the view A of the utility model;

[0024] Figure 7 It is the perspective view of the second implementation of the core pulling seat of the utility model;

[0025] Figure 8 It is the perspective view of the second implementation of the core pulling seat of the utility model; Figure 4 It is the partial enlarged view of the view B of the utility model;

[0026] Wherein: 1 - upper die seat, 2 - lower die seat, 3 - core pulling assembly, 4 - core pulling seat, 5 - limit plate, 6 - reset spring, 7 - sliding slot, 8 - adapter block, 9 - bolt, 11 - upper die cavity, 12 - guide slot, 13 - rectangular slot, 14 - inclined surface, 17 - counterbore, 18 - second threaded hole, 21 - lower die cavity, 22 - installation slot, 23 - step surface, 24 - first threaded hole, 25 - fixed surface, 26 - limit surface, 27 - trapezoidal slot, 41 - shaping block, 42 - clamping portion, 43 - mounting hole, 44 - inclined hole; DETAILED DESCRIPTION

[0027] Combined Figures 1-4As shown in the figure, a core-pulling injection mold for sewing machine includes an upper die base 1, a lower die base 2 and a core-pulling assembly 3, the upper die base 1 and the lower die base 2 are respectively provided with an upper die cavity 11 and a lower die cavity 21 for injection molding, the core-pulling assembly 3 includes a core-pulling base 4, a limiting plate 5 and a reset spring 6, the lower die base 2 is provided with a plurality of mounting grooves 22, the two sides of the mounting groove 22 are connected with the limiting plate 5, and the limiting plate 5 and the mounting groove 22 form a sliding groove 7 for slidingly connecting the core-pulling base 4, the upper die base 1 is provided with a guide groove 12 for moving the core-pulling base 4, the core-pulling base 4 is provided with the reset spring 6 for demolding, the core-pulling base 4 is provided with a shaping block 41 for side pulling in the direction towards the upper die cavity 11, the two sides of the mounting groove 22 are provided with a stepped surface 23, the stepped surface 23 is provided with a first threaded hole 24, a screw is screwed into the first threaded hole 24 through the limiting plate 5, the core-pulling base 4 is provided with a clamping part 42 matched with the sliding groove 7, the core-pulling base 4 is slidingly connected to the sliding groove 7 through the clamping part 42, the core-pulling base 4 is provided with a mounting hole 43 for mounting the reset spring 6, and the two ends of the mounting groove 22 are respectively provided with a fixed surface 25 for abutting against the reset spring 6 and a limiting surface 26 for abutting against the core-pulling base 4.

[0028] In combination Figure 5 , 6 As shown in the figure, the first embodiment of the core-pulling structure is provided, the guide groove 12 is provided with an inclined surface 14 in the direction away from the upper die cavity 11, the fixed surface 25 is provided with a trapezoidal groove 27 matched with the shaping block 41, the upper die base 1 is provided with a rectangular groove 13 corresponding to the trapezoidal groove 27, and the shaping block 41 is slidingly connected between the trapezoidal groove 27 and the rectangular groove 13, in the mold closing process, the core-pulling base 4 is clamped into the guide groove 12, and the core-pulling base 4 is pushed towards the direction of the lower die cavity 21 through the inclined surface 14 until the core-pulling base 4 is completely embedded into the guide groove 12, and this embodiment is suitable for the core-pulling base 4 with lower height and lower required matching precision.

[0029] In combination Figure 7 , 8 As shown in the figure, the second embodiment of the core-pulling structure is provided, the upper die base 1 is provided with a conversion block 8 and a pin 9, the guide groove 12 is fixedly connected with the pin 9, the core-pulling base 4 is provided with an inclined hole 44 corresponding to the pin 9, the conversion block 8 is provided with a countersunk hole 17 for mounting the pin 9, the guide groove 12 is provided with a second threaded hole 18, the conversion block 8 is screwed into the guide groove 12 through the second threaded hole 18, the conversion block 8 is screwed to the upper die base 1 through a screw, the pin 9 is inclined downward through the countersunk hole 17, in the mold closing process, the pin 9 is clamped into the inclined hole 44, the core-pulling base 4 is pushed towards the direction of the lower die cavity 21 through the pin 9 until the core-pulling base 4 is completely embedded into the guide groove 12, and this embodiment is suitable for the core-pulling base 4 with higher height and higher required matching precision.

[0030] The working principle of the utility model discloses is when the upper die holder 1 and the lower die holder 2 are closed, the core-pulling seat 4 is made to move towards the direction of the lower die cavity 21 through the guide groove 12, and the shaping block 41 is made to move to the preset position, at this time, the return spring 6 is compressed, after injection molding and cooling forming, the upper die holder 1 and the lower die holder 2 are opened, the effect of the guide groove 12 is lost, the core-pulling seat 4 resets through the effect of the return spring 6, and drives the shaping block 41 to move away from the injection molded part, avoiding interference between the injection molded part and the shaping block 41 when demolding, and the overall structure is reasonable in design and convenient to install.

[0031] In addition to the above-mentioned embodiments, the utility model can also have other implementation manners. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the utility model.

Claims

1. An inner core-pulling injection mold for a sewing machine, comprising an upper mold base (1), a lower mold base (2), and a core-pulling assembly (3), the upper mold base (1) and the lower mold base (2) being provided with an upper mold cavity (11) and a lower mold cavity (21) for injection molding, respectively, characterized in that, The core-pulling assembly (3) comprises a core-pulling base (4), a limiting plate (5) and a reset spring (6), the lower die base (2) is provided with a plurality of mounting grooves (22), the two sides of the mounting groove (22) are connected with the limiting plate (5), and the limiting plate (5) and the mounting groove (22) form a sliding groove (7) for slidingly connecting the core-pulling base (4), the upper die base (1) is provided with a guide groove (12) for moving the core-pulling base (4), the core-pulling base (4) is provided with a shaping block (41) for side pulling in the direction towards the upper die cavity (11), and the core-pulling base (4) is provided with a reset spring (6) for demolding.

2. The inner-draw injection mold for a sewing machine according to claim 1, characterized by: The two sides of the mounting groove (22) are provided with a stepped surface (23), the stepped surface (23) is provided with a first threaded hole (24), the limiting plate (5) is threadedly connected to the two sides of the mounting groove (22) through the first threaded hole (24), and the core-pulling base (4) is provided with a clamping portion (42) matched with the sliding groove (7), and the core-pulling base (4) is slidingly connected to the sliding groove (7) through the clamping portion (42).

3. The inner core injection mold for sewing machine according to claim 2, wherein: The guide groove (12) is provided with an inclined surface (14) in the direction away from the upper die cavity (11).

4. The inner core injection mold for a sewing machine according to claim 3, characterized in that: The guide groove (12) is provided with a plug (9) for positioning, and the core-pulling base (4) is provided with an inclined hole (44) corresponding to the plug (9).

5. The inner core injection mold for a sewing machine according to claim 4, characterized in that: The upper die base (1) is provided with a conversion block (8), the conversion block (8) is provided with a countersunk hole (17) for mounting the plug (9), the guide groove (12) is provided with a second threaded hole (18), and the conversion block (8) is threadedly connected to the guide groove (12) through the second threaded hole (18).

6. The inner-draw injection mold for a sewing machine according to claim 3 or 4 or 5, characterized in that: The core-pulling base (4) is provided with a mounting hole (43) for mounting the reset spring (6), and the two ends of the mounting groove (22) are respectively provided with a fixed surface (25) for abutting against the reset spring (6) and a limiting surface (26) for abutting against the core-pulling base (4).

7. The inner core injection mold for a sewing machine according to claim 6, characterized in that: The fixed surface (25) is provided with a trapezoidal groove (27) matched with the shaping block (41), the upper die base (1) is provided with a rectangular groove (13) corresponding to the trapezoidal groove (27), and the shaping block (41) is slidingly connected between the trapezoidal groove (27) and the rectangular groove (13).

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